CN110849768A

CN110849768A - Gas density relay with online check, check method and monitoring system

Info

Publication number: CN110849768A
Application number: CN201910830718.6A
Authority: CN
Inventors: 苏丽芳
Original assignee: SHANGHAI ZHUODIAN ELECTRIC CO Ltd
Current assignee: SHANGHAI ZHUODIAN ELECTRIC CO Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-02-28

Abstract

The invention discloses a gas density relay with online check, a check method and a monitoring system, wherein the gas density relay comprises the following components: casing, base, pressure detector, temperature compensation component, a plurality of signal generator and equipment attach fitting still include: the intelligent control system comprises a pressure sensor, a temperature sensor, a pressure adjustable mechanism, a valve and an intelligent control unit; one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the base; the pressure sensor is communicated with the pressure detector on the gas path; the pressure adjustable mechanism is communicated with the pressure detector; the valve is connected with the intelligent control unit; the pressure adjustable mechanism is connected with the intelligent control unit; or further comprising: the gas density detection device comprises a gas density detection sensor, a pressure adjustable mechanism, a valve and an intelligent control unit. The invention is used for monitoring the gas density of the gas-insulated or arc-extinguishing electrical equipment, and simultaneously completing the on-line verification of the gas density relay, thereby improving the efficiency, reducing the operation and maintenance cost and ensuring the safe operation of a power grid.

Description

Gas density relay with online check, check method and monitoring system

Technical Field

The invention belongs to the technical field of gas density relays, and particularly relates to a gas density relay with online verification, a verification method and a monitoring system.

Background

At present, SF₆(Sulfur hexafluoride) electrical equipment has been widely used in electric power departments and industrial and mining enterprises, and promotesThe rapid development of the power industry. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and SF (sulfur hexafluoride) is₆Electrical equipment is used more and more. SF₆The gas has functions of arc extinction and insulation in high-voltage electrical equipment, and SF in the high-voltage electrical equipment₆If the density of the gas is reduced and the micro water content exceeds the standard, the SF is seriously influenced₆Safe operation of high-voltage electrical equipment: 1) SF₆The reduction of the gas density to a certain extent will result in a loss of insulation and arc extinguishing properties. 2) In the presence of some metal species, SF₆The gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, raising the pressure of the gas chamber. 3) When the temperature is reduced, excessive moisture can form condensed water, so that the surface insulation strength of the insulation part is obviously reduced, and even flashover is caused, thereby causing serious harm. Therefore, the grid operating regulations impose that the SF must be applied before and during the operation of the plant₆The density and water content of the gas are periodically measured.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the SF is subjected to₆The online monitoring of the gas density and the micro-water content state of the electrical equipment has important practical significance. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF₆In the case of gas-insulated equipment, if the gas density is reduced (such as caused by leakage), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently on-line monitoring of SF₆Gas density values in high voltage electrical equipment have become very common and gas density monitoring system (gas density relay) applications have been developed vigorously for this purpose. The current gas density monitoring system (gas density relay) is basically: 1) using remote transmission of SF₆The gas density relay realizes the collection and uploading of density, pressure and temperature, and realizes the online monitoring of gas density. 2) Using gas density transducersThe current density, pressure and temperature are collected and uploaded, and the online monitoring of the gas density is realized. SF₆The gas density relay is the core and key component. However, due to the severe environment of the high-voltage substation in field operation, especially the strong electromagnetic interference, in the currently used gas density monitoring system (gas density relay), the remote transmitting SF thereof₆The gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in the power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, and an effective platform is established for realizing real-time data remote data reading and information monitoring. The information such as pressure, temperature, density and the like can be timely transmitted to target equipment (generally a computer terminal) to realize online monitoring.

The gas density relay on the electrical equipment is regularly checked, which is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment; from the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, at present, the calibration of the gas density relay is very important and popular in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises are implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF (sulfur hexafluoride) for completing field verification and detection work of the gas density relay₆A gas. Including power failure and business loss during detection, the detection cost apportioned by each high-voltage switch station every year is approximately tens of thousands to tens of thousands yuan through rough calculation. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist.

Therefore, how to provide a gas density relay with online verification, a verification method and a monitoring system becomes a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a gas density relay with online verification, a verification method and a monitoring system, which are used for monitoring the gas density of gas-insulated or arc-extinguishing electrical equipment and completing online verification of the gas density relay, thereby improving the efficiency, reducing the operation and maintenance cost and ensuring safe operation of a power grid.

In order to achieve the purpose, the invention adopts the following technical scheme:

a gas density relay with online verification, comprising: a shell, a base, a pressure detector, a temperature compensation element, a plurality of signal generators and an equipment connecting joint which are arranged in the shell,

further comprising: the intelligent control system comprises a pressure sensor, a temperature sensor, a pressure adjustable mechanism, a valve and an intelligent control unit; one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the base; the pressure sensor is communicated with the pressure detector on the gas path; the pressure adjustable mechanism is communicated with the pressure detector; the valve is connected with the intelligent control unit; the pressure adjustable mechanism is connected with the intelligent control unit;

or, further comprising: the device comprises a gas density detection sensor, a pressure adjustable mechanism, a valve and an intelligent control unit; one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the base; the gas density detection sensor is communicated with the pressure detector on the gas path; the pressure adjustable mechanism is communicated with the pressure detector; the valve is connected with the intelligent control unit; the pressure adjustable mechanism is connected with the intelligent control unit.

Preferably, the gas density relay further comprises an online check contact signal sampling unit, and the online check contact signal sampling unit is connected with the signal generator and the intelligent control unit respectively.

Preferably, the intelligent control unit is used for controlling the valve, controlling the pressure adjustable mechanism, collecting pressure and collecting temperature; or the intelligent control unit is used for completing density value acquisition.

Preferably, the gas density relay outputs a contact signal through a signal generator.

Preferably, the online check contact signal sampling unit mainly completes sampling of the contact signal of the gas density relay.

Preferably, the online verification contact signal sampling unit meets the requirements of the contact verification of the gas density relay: the contact signal sampling unit is provided with a plurality of independent groups of sampling contacts, and can automatically complete verification on a plurality of pairs of contacts (such as alarm, locking or alarm, locking and overpressure) at the same time; and the action values of alarming, locking or overpressure and the like on the multiple pairs of contacts can be continuously measured without replacing the contacts or reselecting the contacts.

Preferably, the intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic and input and output.

Preferably, the intelligent control unit automatically controls the whole checking process based on embedded algorithms and control programs such as a general computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control mainboard, an embedded main control board and the like, and comprises all peripherals, logics and input and output.

Preferably, the density relay further comprises a movement, a pointer and a dial, and the density relay has indicating value display; or/and digital or liquid crystal devices with a display.

Preferably, the gas density relay can measure a contact value (a pressure value during alarm/locking action) and/or a rated pressure value of the gas density relay at the working environment temperature, and automatically convert the contact value and/or the rated pressure value into a corresponding pressure value at 20 ℃, so that the performance detection of the contact value (alarm and locking) and/or the rated pressure value of the gas density relay is realized on line, and the on-line verification work of the gas density relay is completed.

Preferably, the gas density relay can measure a contact value (pressure value during alarm/locking action) and/or a rated pressure value of the gas density relay under the working environment temperature, and automatically convert the contact value and/or the rated pressure value into a corresponding pressure value at 20 ℃, so that the performance detection of the contact value (alarm and locking) and/or the rated pressure value of the gas density relay is realized on line; and the gas density value, the pressure value and the temperature value of the electrical equipment can be monitored on line, so that the gas density of the electrical equipment can be monitored on line.

Preferably, the valve is closed through the intelligent control unit, so that the gas density relay is isolated from the gas insulated electrical equipment on a gas path; the gas pressure is adjusted to rise and fall through the pressure adjustable mechanism, so that the density relay generates contact signal actions, the contact signal actions are transmitted to the intelligent control unit through the online check contact signal sampling unit, the intelligent control unit detects contact signal (alarm or locking contact) action values and/or return values of the gas density relay according to density values of the contact signal actions, and the check work of the gas density relay is completed online.

Preferably, the intelligent control unit collects a pressure sensor and a temperature sensor, and converts the pressure value and the temperature value of the gas into a pressure value (namely a density value) of 20 ℃ according to the gas characteristics.

Preferably, the gas density relay can convert the measured pressure value and the temperature value into the pressure value corresponding to the 20 ℃ according to the gas characteristics, namely, the gas density relay is verified to have the functions of pressure and temperature measurement and software conversion.

Preferably, the intelligent control unit can measure a density relay of a relative pressure type and an absolute pressure type.

Preferably, the intelligent control unit can measure and can automatically and accurately test the absolute pressure type gas density relay and the relative pressure type gas density relay. The device can test density relays with an absolute pressure structure, an absolute pressure display type density relay, a gauge pressure structure, a gauge pressure display type density relay and a gauge pressure structure, wherein the absolute pressure structure, the absolute pressure display type density relay, the gauge pressure structure and the gauge pressure display type density relay are included. The method comprises the following steps: the gas density relay is provided with an absolute pressure sensor or a relative pressure sensor or both the absolute pressure sensor and the relative pressure sensor.

Preferably, the gas density relay has a man-machine interaction function: the data display interface is provided, and the current data value can be refreshed in real time; the device has a data input function and can input parameter set values.

Preferably, the intelligent control unit of the gas density relay is provided with an interface.

Preferably, the intelligent control unit of the gas density relay is provided with an interface, so that test data storage can be completed; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input.

Preferably, an electrical interface of the density relay has a protection function, and the interface cannot be damaged due to misconnection; or/and will not be disturbed by electromagnetic fields.

Preferably, the intelligent control unit further comprises a communication module, and the information such as the test data and/or the verification result is transmitted remotely through the communication module.

Preferably, the communication mode of the communication module can be a wired mode or a wireless mode.

Preferably, the communication mode of the communication module adopts a wired communication mode or a wireless communication mode, wherein the wired communication mode comprises industrial buses such as RS232, RS485 and CAN-BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, PLC power carrier, a cable Wire and the like; the wireless communication modes comprise NB-IOT, 2G/3G/4G/5G and the like, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic waves, sound waves, satellites, light waves, quantum communication, sonar and the like.

Preferably, the gas density relay further comprises a multi-way connector, and the base, the pressure detector, the valve and the pressure adjustable mechanism of the gas density relay are arranged on the multi-way connector.

Preferably, the gas density relay further comprises a multi-way joint and a self-sealing valve, and the base, the pressure detector, the valve, the pressure adjustable mechanism and the self-sealing valve are mounted on the multi-way joint.

Preferably, the valve is embedded in the multi-way joint.

Preferably, the base, the pressure detector, the valve and the pressure adjustable mechanism are connected together through a plurality of connecting pipes.

Preferably, the valve is an electric valve, an electromagnetic valve, a permanent magnetic electromagnetic valve, a piezoelectric valve, a temperature control valve, a valve which is closed or opened by bending or flattening a hose, or a valve which is made of an intelligent memory material and is opened or closed by electric heating.

Preferably, the valve is sealed within a chamber or housing.

Preferably, in the valve closed state, the pressure-adjustable mechanism is capable of slowly increasing or decreasing the load when increasing or decreasing the pressure. When measuring the action value of the contact signal of the gas density relay, the change speed of the load is not more than 15 per second of the measuring range when approaching the action value. I.e. the pressure is adjustable (can rise or fall smoothly).

Preferably, the pressure adjustable mechanism is a closed air chamber, a heating element is arranged outside or inside the closed air chamber, and the change of the temperature of the gas in the closed air chamber is guided by heating the heating element, so that the pressure of the gas is lifted.

Preferably, the pressure adjustable mechanism is a closed air chamber, a refrigerating element is arranged outside or inside the closed air chamber, and the change of the temperature of the gas in the closed air chamber is guided through the refrigerating element, so that the pressure of the gas is lifted.

Preferably, the pressure adjustable mechanism is a closed air chamber, a heating element and a refrigerating element are arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is guided through the heating element and the refrigerating element, so that the pressure is lifted.

Preferably, the pressure adjustable mechanism is a closed air chamber, a semiconductor is arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is guided through heating or refrigerating the semiconductor, so that the pressure is lifted.

Preferably, the pressure adjustable mechanism is provided with a heat preservation piece, the heat preservation piece is arranged on the outer surface of the closed air chamber, and the temperature change effect is improved.

Preferably, the pressure adjustable mechanism is a piston adjusting mechanism, and the pressure is lifted and lowered by adjusting a piston adjusting piece through magnetic force or a motor (variable frequency motor); or the piston adjusting piece is adjusted through the reciprocating mechanism to finish the lifting of the pressure; or the piston adjusting piece is adjusted through the Carnot cycle mechanism to finish the lifting of the pressure; or the pneumatic element is used for adjusting the piston adjusting piece to finish the pressure rise and fall.

Preferably, the pressure adjustable mechanism is an air bag, and the air bag is adjusted through a magnetic force or a motor (variable frequency motor), or a reciprocating mechanism, or a Carnot circulating mechanism, or a pneumatic element, so that the pressure is lifted.

Preferably, the pressure adjustable mechanism is a corrugated pipe, and the pressure is adjusted to rise and fall through the magnetic force or a motor (variable frequency motor) or a reciprocating mechanism, or a carnot circulating mechanism, or a pneumatic element.

Preferably, the pressure adjustable mechanism is a release valve, the release valve is sealed in an air chamber or connected with an air chamber, and the pressure is lifted through the release valve.

Preferably, the pressure adjustable mechanism further comprises a flow valve, and the pressure is lifted and lowered through the flow valve and a deflation valve.

Preferably, the air release valve is an electromagnetic valve, or an electric valve, or other air release valves implemented by electric or pneumatic means.

Preferably, the pressure adjustable mechanism is a compressor, and the pressure is lifted through the compressor.

Preferably, the pressure adjustable mechanism is a pump, and the pressure is lifted through the pump.

Preferably, the pump is an air pump, and the pressure is lifted by the air pump.

Preferably, the pump is a pressurizing pump, or an electric air pump, or an electromagnetic air pump.

Preferably, the pressure adjustable mechanism is sealed in a cavity or housing.

Preferably, the valve and the pressure adjustable mechanism are sealed within a chamber or housing.

Preferably, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.

Preferably, the temperature sensor is arranged on or in the housing of the gas density relay or outside the housing.

Preferably, the temperature sensor is arranged in the vicinity of a temperature compensation element of the gas density relay.

Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.

Preferably, the pressure sensor and the temperature sensor are of an integrated structure; or the integrated structure formed by the pressure sensor and the temperature sensor also has a remote transmission function, and can directly remotely transmit density, pressure and temperature signals and the contact signal state of the remote transmission gas density relay.

Preferably, the pressure and temperature sensors are of an integrated structure; or the pressure and temperature sensor is an integrated gas density transmitter, and the gas density transmitter directly transmits density, pressure and temperature signals and monitors and transmits the contact signal state of the gas density relay.

Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

Preferably, the gas density relay has a remote transmission function.

Preferably, the online verification contact signal sampling unit is relatively isolated from the gas density relay contact signal in a non-verification state. When the density relay is in a checking state, a density relay contact signal control loop can be cut off, and the contact action signal of the gas density relay is ensured not to be uploaded during checking, so that the safe operation of a power grid is not influenced.

Preferably, pass through photoelectric isolation on the circuit with gas density relay contact signal on online check-up contact signal sampling unit, can ensure when the check-up, the unit safety is controlled to the protection intelligence.

Preferably, online check-up contact signal sampling unit have protection circuit, when preventing the check-up, the unit is controlled to the intelligence receives the influence.

Preferably, the online check contact signal sampling unit can be connected the contact signal of the gas density relay with the intelligent control unit.

Preferably, the intelligent control unit further comprises a clock, the clock is arranged on the intelligent control unit, and the clock can be used for regularly setting the time for checking the density relay or recording the test time.

Preferably, the solar energy power supply also comprises a power supply circuit and a recyclable rechargeable battery, or various suitable power supplies, such as solar energy, a lithium battery and the like.

Preferably, the density relay can be periodically checked according to the setting or the instruction of the background, namely, the time for periodically setting the on-line check of the density relay is periodically finished.

Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value of the density relay or the switching value of the contact signal action value not lower than 24V, namely, during verification, the voltage not lower than 24V is applied between corresponding terminals of the contact signal.

Preferably, the gas density relay is provided with a rated pressure value output signal, and the rated pressure value output signal is connected with the intelligent control unit.

Preferably, when the rated pressure value of the gas density relay outputs a signal, the intelligent control unit simultaneously collects the current density value, and the calibration of the rated pressure value of the gas density relay is completed. The gas density relay will automatically make comparison and judgment, if the error exceeds the set value, it will send out abnormal prompt: there is a problem with elements such as a pressure detector, a temperature compensation element, a pressure sensor, and a temperature sensor of the gas density relay. Namely, the gas density relay can complete the mutual checking function of the pressure detector, the temperature compensation element and the pressure sensor, the temperature sensor or the density transmitter of the gas density relay.

Preferably, the intelligence is controlled the unit and can be accomplished gas density relay's mechanical part, pressure sensor, temperature sensor's mutual check-up, when gas density relay accomplishes the online check-up of gas density relay self, can carry out the mutual contrast judgement automatically, if the error exceeds its setting value, will send unusual suggestion: the pressure detector, temperature compensation element or pressure sensor, temperature sensor of the gas density relay have problems. That is, the gas density relay can perform the function of mutual verification between the pressure detector, the temperature compensation element, and the like of the gas density relay and the pressure sensor, the temperature sensor, or the density transmitter. Has the capability of artificial intelligent proofreading.

Preferably, the gas density relay comprises a plurality of pressure sensors and temperature sensors, the mutual verification of the test data of the pressure sensors and the temperature sensors and the mutual verification of the test data of the pressure sensors, the temperature sensors and the gas density relay ensure that the gas density relay works normally.

Preferably, the zero bit is put to gas pressure completely to the bleed valve, adjustable mechanism of pressure adjusts gas pressure to the zero bit, and the unit is controlled to the intelligence and the pressure value at that time is gathered simultaneously, and gas density relay can carry out the zero bit check of pressure voluntarily to judge, if the error exceeds its setting value, will send unusual suggestion: pressure sensors have problems. Namely, the gas density relay can complete the zero calibration function of the pressure sensor.

Preferably, the intelligent control unit can finish the proofreading of the temperature sensor. The method comprises the following steps: and the gas density relay compares the transmitted environmental temperature value with the sampling value of the temperature sensor.

Preferably, after the intelligent control unit completes the calibration work of the gas density relay, a calibration report of the density relay can be automatically generated, and if the calibration report is abnormal, an alarm is automatically sent out, or the calibration report is sent to a designated receiver, for example, a mobile phone.

Preferably, after the intelligent control unit completes the checking work of the gas density relay, if an abnormality occurs, an alarm can be automatically sent out and uploaded to a remote end, or sent to a designated receiver, for example, a mobile phone.

Preferably, after the intelligent control unit completes the check work of the gas density relay, if the intelligent control unit is abnormal, the intelligent control unit uploads an alarm contact signal of the density relay, and the alarm contact signal is processed by a receiver after uploading, so that the check condition of the gas density relay can be conveniently known.

Preferably, the density value and the verification result are displayed on site in a field mode or displayed in a background mode, and the specific mode can be flexible.

Preferably, the control of the intelligent control unit is realized through field control, or through background control, or through mutual interaction of the field control and the background control.

Preferably, the gas density relay has the functions of displaying data such as real-time online density values, pressure values and temperature values, analyzing change trends, inquiring historical data, giving an alarm in real time and the like.

Preferably, the gas density relay further comprises: a housing; the intelligent control unit and the online check contact signal sampling unit are arranged in the shell.

Preferably, the intelligent control unit comprises: the system comprises a microprocessor, a human-computer interface, a valve controller and a pressure-adjustable mechanism position detection and execution controller, wherein the human-computer interface, the valve controller and the pressure-adjustable mechanism position detection and execution controller are all electrically connected with the microprocessor.

Preferably, the core element of the intelligent control unit is a processor composed of integrated circuits.

Preferably, the core element of the intelligent control unit is a programmable controller.

Preferably, the core element of the intelligent control unit is an industrial personal computer or an industrial computer.

Preferably, the intelligent control unit and the online check contact signal sampling unit include: a singlechip, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.

Preferably, the circuit of the intelligent control unit comprises a protection component, in particular an anti-interference component.

Preferably, the online check contact signal sampling unit comprises a protection component, in particular an anti-interference component.

Preferably, the rated pressure value of the gas density relay or other pressure values needing to be verified have a contact signal output.

Preferably, the gas density relay can monitor the gas density value on line, or the density value, the pressure value and the temperature value.

Preferably, the gas density relay further comprises a micro-water sensor capable of monitoring the micro-water value of the gas on line.

Preferably, the gas density relay further comprises a micro-water sensor and a gas circulation mechanism, and the micro-water value in the gas can be monitored on line.

Preferably, the gas circulation mechanism comprises a capillary tube with a proper length, a sealed chamber and a heating element, and the gas flow is realized by heating the heating element, so that the micro water value in the gas can be monitored online.

Preferably, the gas density relay further comprises a decomposition product sensor capable of monitoring the gas decomposition product on line.

Preferably, the gas density relay has a self-diagnosis function, and can notify an abnormality in time. Such as a wire break, a short alarm, a sensor failure, etc.

Preferably, the gas density relay has a safety protection function, and when the density value or the pressure value is lower than a set value, the density relay is automatically not checked any more, and a notification signal is sent out.

Preferably, when the environment temperature of high temperature, low temperature, normal temperature, 20 ℃ is checked, the error judgment requirements of the gas density relay are different, and the gas density relay can be implemented according to the requirements of temperature and related standards.

Preferably, the gas density relay can compare the error performance of the density relay at different temperatures and different time periods. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the gas density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay can also be subjected to physical examination.

Preferably, the gas density relay is repeatedly checked for a plurality of times (for example, 2 to 3 times), and an average value thereof is calculated.

Preferably, the gas density relay can be checked at any time when necessary.

Preferably, the verification result of the intelligent control unit on the density relay can be uploaded in various ways or ways, for example, uploading can be implemented through density online remote transmission; or through wireless uploading; or uploading through other routes; the signal can be uploaded through an alarm contact signal wire; or uploading separately; or uploaded with other signal packages.

Preferably, the judgment of the density values of the gas density relay and the monitored electrical equipment is carried out normally or not, and the judgment, analysis and comparison of the density values of the electrical equipment and the pressure detector, the temperature compensation element, the pressure sensor and the temperature sensor of the gas density relay are carried out normally or abnormally, so that the monitoring of the gas density of the electrical equipment and the judgment, comparison and analysis of the state of the gas density relay are realized.

Preferably, the gas density relay has a plurality of pressure sensors and temperature sensors. And multiple monitoring and comparison are carried out, so that the reliability is ensured.

Preferably, pressure sensors are respectively arranged on two sides of the air path of the valve; during calibration, when the valve is closed, one pressure sensor monitors the pressure value of the electrical equipment, and further monitors the density value of the electrical equipment constantly, so that the safety of the calibration process is ensured; the other pressure sensor self-checks the pressure value of the gas density relay.

Preferably, be provided with density relay or density switch at the front end of valve, export the signal of a safety check set point, this signal is connected with the intelligent control unit, and then monitors the density value of electrical equipment itself constantly, guarantees that the check-up process is safe.

Preferably, when the density of the gas density relay monitors that the gas pressure is abnormal on line, the on-line verification of the gas density relay is started, so that the performance of the gas density relay is known and compared and analyzed.

Preferably, when the density of the gas density relay monitors that the gas pressure has a rising trend on line, an abnormal notice is timely provided.

Preferably, the gas density relay can verify the temperature sensor according to the temperature value of the atmospheric environment.

Preferably, the gas density relay can also perform on-line monitoring on the internal temperature of the electrical equipment.

Preferably, the device further comprises a camera, and the camera monitors the gas density relay.

Preferably, the system further comprises an analysis system (expert management analysis system), and the analysis system performs detection analysis and judgment on the gas density monitoring, the gas density relay performance and the monitoring element to know where the problem point is. Whether it is an electrical device or a gas density relay has a problem itself.

Preferably, the gas density relay can monitor the contact signal state of the gas density relay and remotely transmit the state of the contact signal state. The contact signal state of the gas density relay can be known in the background: the open or closed state is realized, so that one more layer of monitoring is realized, and the reliability is improved.

Preferably, the gas density relay can also detect, or detect and determine, the temperature compensation performance of the gas density relay.

Preferably, the gas density relay can also detect, or detect and determine, a contact resistance of the gas density relay.

Preferably, the gas density relay can also detect or detect and judge the temperature compensation performance, the contact point contact resistance and the insulation performance of the gas density relay.

Preferably, the gas density relay also monitors the contact signal state of the gas density relay.

Preferably, the gas density relay also monitors the state of a control loop of a contact signal of the gas density relay. For example: broken lines, short circuits, etc.

Preferably, the gas density relay can also perform online air supplement.

Preferably, the gas density relay can also carry out online gas drying.

Preferably, the gas density relay includes protection for the ambient temperature of the electronic components to prevent operation at too low or too high temperatures to allow operation within the allowable temperature range. A heater and/or a radiator (fan) can be arranged, the heater is started at low temperature, and the radiator (fan) is started at high temperature, so that the pressure sensor and/or the integrated circuit and other electronic elements can reliably work in low-temperature or high-temperature environments.

Preferably, the gas density relay has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on the electrical equipment and the density relay.

Preferably, the pressure detector is a bourdon tube or a bellows tube; the temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the signal generators are micro switches or magnetic-assisted electrical contacts. The sealed air chamber is sealed with compensation air which has temperature compensation function to the signal mechanism.

A method of verifying a gas density relay with online verification, comprising:

when the intelligent control system works normally, the gas density relay monitors the gas density in the equipment, and meanwhile, the gas density relay monitors the gas density value in the equipment on line through the pressure sensor, the temperature sensor and the intelligent control unit;

the gas density relay is based on the set checking time and the gas density value condition, under the condition that the gas density relay is allowed to be checked:

1) closing the valve through an intelligent control unit;

2) adjusting the online check contact signal sampling unit to a check state through the intelligent control unit, and cutting off a density relay contact signal control loop when the online check contact signal sampling unit is in the check state, wherein the density relay contact signal is connected to the intelligent control unit;

3) the pressure adjustable mechanism is driven by the intelligent control unit, so that the gas pressure is slowly reduced, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit, the intelligent control unit obtains a density value according to a pressure value and a temperature value when the contact acts or directly obtains a density value, a contact signal (an alarm or a locking contact) action value of the gas density relay is detected, and the check work of the contact signal action value of the gas density relay is completed;

4) the intelligent control unit drives the pressure adjustable mechanism to slowly raise the gas pressure so that the gas density relay generates contact point resetting, the contact point signal resetting is transmitted to the intelligent control unit through the online checking contact point signal sampling unit, the intelligent control unit obtains a density value according to a pressure value and a temperature value when the contact point is reset or directly obtains the density value, a contact point signal (an alarm or a locking contact point) return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed;

5) after all contact signal check-up work were accomplished, open the valve through the unit is controlled to the intelligence, control the unit through the intelligence and adjust online check-up contact signal sampling unit to operating condition, when operating condition, gas density relay contact signal control circuit resumes the normal state of operation. After the on-line calibration of the gas density relay is completed, the gas density relay automatically restores to the working state, the valve 4 is opened at the moment, the on-line calibration contact signal sampling unit is adjusted to the working state, and the gas density relay contact signal control loop restores to the normal working state.

Preferably, the gas density relay can automatically compare and judge the checking and detecting result.

Preferably, after the gas density relay completes the checking work of the gas density relay, if an abnormality occurs, an alarm can be automatically sent out and uploaded to a remote end in various modes or sent to a designated receiver, for example, a mobile phone.

Preferably, after the verification work of the gas density relay is completed, if the gas density relay is abnormal, the intelligent control unit uploads an alarm contact signal through the density relay.

Preferably, the gas density relay can monitor the gas density value, the pressure value and the temperature value of the electrical equipment on line, so as to realize on-line monitoring of the gas density of the electrical equipment.

A monitoring system of a gas density relay with on-line self-checking comprises a plurality of gas density relays with on-line checking, wherein the plurality of gas density relays with on-line checking are connected with a remote background detection system sequentially through a concentrator and a protocol converter; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding insulating gas chambers.

Preferably, the system comprises a plurality of gas density relays with online verification, and the gas density relays with online verification are connected with a remote background detection system through a concentrator, an IEC61850 or IEC104 protocol converter in sequence; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding insulating gas chamber.

Preferably, the hub adopts an RS485 hub, and the IEC61850 or IEC104 protocol converter is also connected with the network service printer and the network data router respectively.

Preferably, the plurality of gas density relays with online verification upload various sensor data to an internet of things cloud platform in a wired or wireless communication mode; wherein the wired communication modes comprise industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carriers and the like; the wireless communication mode comprises a sensor built-in 5G/NB-IOT communication module (such as 5G, NB-IOT), 2G/3G/4G/5G and the like, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic waves, sound waves, satellites, light waves, quantum communication, sonar and the like.

Preferably, the monitoring system has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like. The system has the functions of data analysis and data processing, can perform corresponding fault diagnosis and prediction on the electrical equipment, and provides technical support for the state maintenance of the electrical equipment.

Preferably, the electrical equipment comprises SF₆Gas electric apparatus, SF₆Mixed gas electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment. The electrical equipment comprises GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas-filled cabinets, ring main units and the like. The gas density relay includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combination gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF₆Gas density relay, SF₆A hybrid gas density relay, an N2 gas density relay, other gas density relays, and the like.

The invention provides a gas density relay with online check, a check method and a monitoring system.A valve is closed by an intelligent control unit, so that the gas density relay is isolated from electrical equipment on a gas path; the pressure is adjusted through the pressure adjustable mechanism, so that the density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit, the intelligent control unit detects the alarm or locking contact action value and/or return value of the gas density relay according to the density value when the contact acts, and the check work of the gas density relay is completed. The invention realizes the calibration function of the gas density relay while monitoring the gas density of the gas-insulated or arc-extinguishing electrical equipment, thereby completing the regular calibration work of the gas density relay without the need of maintainers to complete the calibration work of the density relay on site, greatly improving the efficiency, reducing the operation and maintenance cost and ensuring the safe operation of a power grid.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a control circuit diagram according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 4 is a schematic structural diagram of embodiment 3 of the present invention.

FIG. 5 is a schematic structural diagram of embodiment 4 of the present invention.

FIG. 6 is a schematic structural diagram of embodiment 5 of the present invention.

FIG. 7 is a schematic structural diagram of embodiment 6 of the present invention.

FIG. 8 is a schematic structural diagram of embodiment 7 of the present invention.

FIG. 9 is a schematic structural diagram of embodiment 8 of the present invention.

FIG. 10 is a schematic structural diagram of embodiment 9 of the present invention.

FIG. 11 is a schematic structural diagram of example 10 of the present invention.

FIG. 12 is a schematic structural view of example 11 of the present invention.

FIG. 13 is a control circuit diagram of the present invention.

FIG. 14 is a diagram of another control circuit of the present invention.

FIG. 15 is a diagram of another control circuit of the present invention.

FIG. 16 is a diagram of another control circuit of the present invention.

FIG. 17 is a diagram of another control circuit of the present invention.

FIG. 18 is a diagram of another control circuit of the present invention.

FIG. 19 is a diagram of another control circuit of the present invention.

FIG. 20 is a schematic diagram of a 4-20mA type density transmitter circuit of the present invention.

FIG. 21 is a schematic structural view of example 14 of the present invention.

Fig. 22 is a schematic structural diagram of the maintenance-free intelligent gas density monitoring system of the invention.

Fig. 23 is a schematic diagram of another structure of the maintenance-free intelligent gas density monitoring system of the invention.

FIG. 24 is a schematic diagram of another embodiment of the maintenance-free intelligent gas density monitoring system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to the attached drawing 1, the invention discloses a gas density relay with on-line check for high and medium voltage electrical equipment, which comprises a gas density relay body 1, wherein the density relay body 1 mainly comprises: the pressure sensor comprises a shell 101, and a base 102, a pressure detector 103, a temperature compensation element 104, a movement 105, a pointer 106, a dial 107, an end seat 108, a plurality of signal generators 109 and an equipment connecting joint 1010 which are arranged in the shell. The gas density relay further comprises: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online check contact signal sampling unit 6 and an intelligent control unit 7; one end of the valve 4 is communicated with the equipment connection joint 1010, and the other end of the valve 4 is communicated with the base 102; the pressure sensor 2 is communicated with the pressure detector 103 on the air path; the pressure adjustable mechanism 5 is communicated with the pressure detector 103; the online check contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. One end of the pressure detector 103 and one end of the temperature compensation element 104 are both fixed on the end seat 108, the other end of the pressure detector 103 is connected on the base 102, the other end of the temperature compensation element 104 is connected with the movement 105 through a display link or the other end of the temperature compensation element 104 is directly connected with the movement 105, and the pointer 106 is installed on the movement 105 and is arranged in front of the dial 107. The signal generator 109 may be a microswitch or a magnetically assisted electrical contact, and the contact signal of the density relay is output through the signal generator 109. The pressure detector 103 may employ a bourdon tube or a bellows tube. The temperature compensation element 104 may employ a compensation plate or a gas enclosed within a housing. The gas density relay of the present invention may further comprise: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge. In the gas density relay of embodiment 1 of the present invention, the varying pressure and temperature are corrected based on the pressure detector 103 and by the temperature compensation element 104 to reflect the variation in the (sulfur hexafluoride) gas density. Under the pressure of the measured medium (sulfur hexafluoride) gas, due to the action of the temperature compensation element 104, when the density value of the (sulfur hexafluoride) gas changes, the pressure value of the (sulfur hexafluoride) gas also changes correspondingly, so that the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the measured sulfur hexafluoride gas is indicated on the dial 107. The signal generator 109 serves as an output alarm latch contact signal. Thus, the gas density relay can display the density value of the (sulfur hexafluoride) gas. If the density value of the sulfur hexafluoride gas is reduced after air leakage, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, the pointer 106 moves towards the direction with small indication value, the air leakage degree is specifically displayed on the dial 107, and the signal generator 109 outputs (alarm locking) contact signals to monitor and control the density of the sulfur hexafluoride gas in equipment such as an electrical switch and the like, so that the electrical equipment can work safely. The valve 4 may be various and may be a cut-off valve, such as a ball valve, a butterfly valve, a gate valve, a stop valve, a plug valve, a butterfly valve, a needle valve, a diaphragm valve, etc. If the ball valve, the self-sealing valve core can be rotated to drive the ball valve to close the air passage of the switch device, and the self-sealing valve can be flexibly designed according to actual requirements. The valve 4 is automatic and can be verified manually or semi-manually.

The gas density relay further comprises: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online check contact signal sampling unit 6 and an intelligent control unit 7; one end of the valve 4 is hermetically connected to the equipment connecting joint 1010, and the other end of the valve 4 is communicated with the base 102 of the gas density relay; the pressure sensor 2 is communicated with the pressure detector 103 on the air path; the pressure adjustable mechanism 5 is communicated with the pressure detector 103; the online check contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7; the pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with the intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7.

Fig. 2 is a schematic diagram of a control circuit of a gas density relay with online verification according to embodiment 1 of the present invention, and as shown in fig. 2, the online verification contact signal sampling unit 6 of this embodiment mainly includes a relay J1 and a relay J2. For the gas density relay with the contact signal of a normally open contact when the density pressure value is normal, see fig. 2, two pairs of normally closed contacts J11 and J12 of the relay J1 are connected in series in a contact control loop of the gas density relay; the two pairs of normally open contacts J21 and J22 of the relay J2 are connected to the contact signals of the gas density relay. It can also be: wherein a pair of normally closed contacts J11 of the relay J1 are connected in series in a contact signal control loop of the gas density relay; a pair of normally open contacts J21 of the relay J2 are connected to a contact signal of the gas density relay; it is also possible that relay J1 and relay J2 are integrated, i.e., a relay with normally open and normally closed contacts. In short, the utility model can be used in a plurality of pairs, single and flexible combination. Referring to fig. 2, the intelligent control unit 7 mainly includes a processor U1 and a power supply U2, and the processor U1 may be: general purpose computer, industrial computer, CPU, singlechip, ARM chip, AI chip, quantum chip, photon chip, MCU, FPGA, PLC etc., industrial control mainboard, embedded main control board etc. and other intelligent integrated circuit. The power source U2 may be: switch power supply, alternating current 220V, direct current power supply, LDO, programmable power supply, solar energy, storage battery, rechargeable battery, battery and the like. And the pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and the like. The temperature sensor 3 of the temperature acquisition T may be: various temperature sensing elements such as temperature sensors and temperature transmitters. The valve 4 may be: solenoid valves, electric valves, pneumatic valves, ball valves, needle valves, regulating valves, shut-off valves, etc. can open and close the gas circuit and even the elements controlling the flow. Semi-automatic may also be a manual valve. The pressure adjustable mechanism 5 may be: electric regulating piston, electric regulating cylinder, booster pump, gas cylinder, valve, electromagnetic valve and flow controller. Semi-automatic, but also manually adjustable pressure-adjustable mechanisms.

The working principle of embodiment 1 of the invention is as follows:

the intelligent control unit 7 of the gas density relay monitors the gas pressure P and the temperature T of the electrical equipment 8 according to the pressure sensor 2 and the temperature sensor 3 to obtain the corresponding 20 ℃ pressure value P₂₀(i.e., gas density value). When the density relay needs to be checked, if the gas density value P is detected at the moment₂₀Not less than set safety check density value P_S(ii) a The gas density relay issues an instruction to close the valve 4 via the intelligent control unit 7, so that the gas density relay is isolated from the electrical equipment connector 1010 on the gas path. As shown in fig. 2, the gas density relay then sends out a command to open the control loop of the gas density relay through the intelligent control unit 7, that is, the contacts J11 and J12 of the electromagnetic relay J1 of the online verification contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment is not affected when the gas density relay is verified online, and the alarm signal is not mistakenly sent or the control loop is locked when the gas density relay is verified. Because the gas density value P of the gas density relay is already carried out before the calibration is started₂₀Not less than set safety check density value P_SMonitor (A)The measurement and judgment are safe during verification because the gas of the electrical equipment is in a safe operation range and the gas leakage is a slow process. Meanwhile, the gas density relay then sends out an instruction, the intelligent control unit 7 is communicated with a contact sampling circuit of the gas density relay, namely, contacts J21 and J22 of an electromagnetic relay J2 of the online verification contact signal sampling unit 6 are closed, and at the moment, a contact PJ of the gas density relay is connected with the intelligent control unit 7 through contacts J21 and J22 of the electromagnetic relay J2. Then, the gas density relay sends out a command to operate the pressure-adjustable mechanism 5, controls the driving part 52 of the pressure-adjustable mechanism 5 through the intelligent control unit 7 (which can be realized by mainly adopting a motor and a gear, and the mode is various and flexible), further, the piston 51 of the pressure-adjustable mechanism 5 is adjusted to change the volume of the sealed chamber composed of the piston 51, the pressure detector 103 of the gas density relay, the valve 4, etc., so that the pressure of the gas in the pressure detector 103 of the gas density relay is gradually reduced to make the density relay contact point operate, the contact action is uploaded to the intelligent control unit 7 through an electromagnetic relay J2 of the online checking contact signal sampling unit 6, and the intelligent control unit 7 converts the pressure value P and the temperature T value measured during the contact action into the pressure value P corresponding to 20 ℃ according to the gas characteristics.₂₀(density value), the contact action value P of the gas density relay can be detected_D20And after all the contact action values of the alarm and/or locking signals of the gas density relay are detected. And then the intelligent control unit 7 controls a motor (a motor or a variable frequency motor) of the pressure adjustable mechanism 5, and adjusts the piston 51 of the pressure adjustable mechanism 5, so that the pressure of the gas of the pressure detector 103 of the gas density relay is gradually increased, and the return value of the alarm and/or locking contact signal of the gas density relay is tested. The gas density relay may be so repeatedly verified (e.g., 2-3 times) and then the average value calculated. After the corresponding requirements are completed, the calibration work of the gas density relay is completed. Then the gas density relay sends out an instruction to cut off the contact sampling circuit of the gas density relay through the intelligent control unit 7, namely, the contact J of the electromagnetic relay J2 of the online verification contact signal sampling unit 621 and J22 are opened, the contact PJ of the gas density relay is disconnected from the intelligent control unit 7 by opening the contacts J21 and J22 of the electromagnetic relay J2. At the same time, the gas density relay issues a command, that is, the valve 4 is opened through the intelligent control unit 7, so that the gas density relay is communicated with the electrical equipment connector 1010 on the gas path and further communicated with the electrical equipment. The gas density relay sends out the instruction again next, through the control circuit of intelligence accuse unit 7 intercommunication gas density relay, the contact J11 and the J12 of the electromagnetic relay J1 of online check contact signal sampling unit 6 are closed promptly for gas density relay's density monitoring circuit normal work makes gas density relay safety monitoring electrical equipment's gas density, makes electrical equipment safe and reliable work. Therefore, the online checking work of the gas density relay is conveniently finished, and the safe operation of the electrical equipment is not influenced when the gas density relay is checked online. After the checking work of the gas density relay is finished, the gas density relay judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the gas density relay can be uploaded in an online remote transmission communication mode, for example, the gas density relay can be uploaded to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In short, after the gas density relay completes the online verification work of the gas density relay, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the calibration work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit can upload the alarm contact signal of the density relay to a remote end (a monitoring room, a background monitoring platform and the like) and can display a notice on site. Simple density relay on-line check can upload the abnormal result of the check result through an alarm signal line, and the check can be carried outUploading according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with an alarm signal contact, and the alarm signal contact is regularly closed and opened, so that the condition can be obtained through analysis; or through a separate verification signal line. Specifically, the state can be uploaded well or the problem can be uploaded. The verification result can be uploaded through remote density on-line monitoring, or through a single verification signal line, or through on-site display, on-site alarm or wireless uploading, and can be uploaded through the smart phone network. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and various combinations.

The gas density relay has a safety protection function, and particularly, when the gas density relay is lower than a set value, the gas density relay automatically does not perform online verification on the density relay any more and sends an announcement signal. For example, when the gas density value of the plant is less than the set value P_SIt is not verified. For example: only when the gas density value of the equipment is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.

The gas density relay may be checked on line according to a set time, or may be checked on line according to a set temperature (for example, a limit high temperature, a limit low temperature, a normal temperature, 20 degrees, etc.). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.

The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods. Namely, the comparison in the same temperature range at different periods, the performance of the gas density relay, the electrical equipment and the gas density relay is judged. The comparison of each period with history and the comparison of the history and the present are carried out. And carrying out physical examination on the gas density relay.

The gas density relay can be repeatedly verified for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated according to the verification result of each time.

When necessary, the gas density relay can be checked on line at any time.

Pressure sensor types: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor may be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with an induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with a slide wire resistor attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, or other pressure-sensitive elements, such as diffused silicon type, sapphire type, piezoelectric type, and strain gauge type (resistance strain gauge type, ceramic strain gauge type). The temperature sensor may be: a thermocouple, a thermistor, a semiconductor type; the temperature sensor can be in contact type or non-contact type; the sensor material and electronic component characteristics, the temperature sensor can be thermal resistance and thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.

The density relay includes: the density relay with indication (density relay with pointer display, density relay with digital display, density relay with liquid crystal display) and the density relay without indication (density switch).

The gas density relay has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay can be detected on line. Of course, the return value of the alarm and/or latch contact signal may also be such that no testing is required, as desired.

The intelligent control unit 7 mainly completes control of the valve, control of the pressure adjustable mechanism and signal acquisition. Namely, the basic requirements or functions of the intelligent control unit 7 are: the control of the valve 4, the control of the pressure adjustable mechanism 5 and the signal acquisition are completed through the intelligent control unit 7. The realization is as follows: 1. the pressure value and the temperature value when the contact signal of the gas density relay acts can be detected and converted into the corresponding pressure value P at 20 DEG C₂₀(density value), i.e. contact operating value P capable of detecting gas density relay_D20And finishing the checking work of the gas density relay. Or, the density value P of the contact signal of the gas density relay can be directly detected when the contact signal is actuated_D20And the verification work of the gas density relay is completed, which is the most basic requirement. Of course, the intelligent control unit 7 can also realize: test data storage can be completed; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input; the intelligent control unit also comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value of the gas density relay outputs a signal, the intelligent control unit simultaneously acquires the current density value, and the calibration of the rated pressure value of the gas density relay is completed. The gas density relay can automatically carry out comparison and judgment, and if the error exceeds the set value, an abnormal prompt is sent out: the gas density relay itself has problems with pressure detectors, pressure sensors, temperature sensors, etc. Namely, the gas density relay can complete the mutual calibration function of a pressure detector, a pressure sensor, a temperature sensor, a density transmitter and the like of the gas density relay; the mutual verification of a pressure detector, a pressure sensor, a temperature sensor and the like of the gas density relay can be completed. When the gas density relay completes the calibration of the gas density relay, the mutual comparison and judgment can be automatically carried out, if the mutual comparison and judgment are carried out, the gas density relay is connected with the gas density relayWhen the error exceeds the set value, an abnormal prompt is sent out: the gas density relay itself has problems with pressure detectors or pressure sensors, temperature sensors, etc. Namely, the gas density relay can complete the mutual checking function of the pressure detector, the pressure sensor, the temperature sensor, the density transmitter and the like of the gas density relay. The artificial intelligence proofreading capability is realized; after the checking work of the gas density relay is finished, a checking report of the density relay can be automatically generated, if the checking report is abnormal, an alarm can be automatically sent out, or the checking report can be sent to a specified receiver, for example, a mobile phone; the density value and the verification result are displayed on site or on the background, and the specific mode can be flexible; the system has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; the gas density value, or the density value, the pressure value and the temperature value can be monitored on line; the device has a self-diagnosis function and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc.; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the gas density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay can be subjected to self-examination; the density value of the monitored electric equipment is judged whether the density value of the electric equipment is normal or not. The density value of the electrical equipment, the pressure detector of the gas density relay, the pressure sensor, the temperature sensor and the like can be judged, analyzed and compared normally and abnormally, and the states of the gas density monitoring of the electrical equipment, the gas density relay and the like can be judged, compared and analyzed; the system also comprises an analysis system (expert management analysis system) for detecting and analyzing the gas density monitoring, the gas density relay and the monitoring element, and judging to know where the problem point is. Whether the electrical equipment or the gas density relay itself is problematic; the contact signal state of the gas density relay is also monitored,and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay can be detected or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

As long as the pressure sensor 2, the temperature sensor 3, the pressure detector 103, the temperature compensation element 104, and the like are matched and normal with each other, it can be said that the gas density relay itself is normal. Therefore, the gas density relay can be verified on site by maintenance personnel without adopting a traditional mode, and the whole service life can be free of manual verification. Unless the pressure sensor 2, the temperature sensor 3, the pressure detector 103 of the gas density relay, the temperature compensation element 104 and the like of one electric device in the substation are inconsistent and abnormal with each other, the maintenance personnel are arranged to deal with the inconsistency. And for the inosculated and normal, manual verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.

The online check contact signal sampling unit mainly completes sampling of the contact signal of the gas density relay. Namely, the basic requirements or functions of the online check contact signal sampling unit 6 are as follows: 1. the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay acts during the calibration, the safe operation of the electrical equipment is not influenced; 2. the contact signal control loop of the gas density relay does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit, and does not damage the gas density relay or influence the test work.

Example 2

Referring to fig. 3, the present embodiment discloses a gas density relay with online verification, comprising: the gas density relay comprises a gas density relay body 1 (the density relay body 1 mainly comprises a shell, and a base, a pressure detector, a temperature compensation element, a machine core, a pointer, a dial, an end seat, a plurality of signal generators and an equipment connecting joint 1010 which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, an electromagnetic valve 4, a pressure adjustable mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the equipment connection joint 1010, and the other end of the valve 4 is communicated with the base of the density relay and the pressure detector. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on or in the shell of the gas density relay body 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay on a gas path; the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The difference from the first embodiment is that the pressure adjustable mechanism 5 of the present embodiment mainly includes a piston 51 (the piston 51 is provided with a seal 510), and a driving member 52. The pressure adjustable mechanism 5 makes the driving part 52 push the piston 51 to make the sealed cavity generate volume change according to the control of the intelligent control unit 7, and then completes the pressure rise and fall. Through this adjustable mechanism of pressure regulation pressure for gas density relay takes place the contact action, and the contact action passes through online check-up contact signal sampling unit 6 and transmits intelligent control unit 7, and pressure value and temperature value when intelligent control unit 7 moves according to gas density relay's contact, convert into corresponding density value, detect gas density relay's warning and/or shutting contact action value and/or return value, accomplish gas density relay's check-up work.

Example 3

Referring to fig. 4, the present embodiment discloses a gas density relay with online verification, comprising: the device comprises a mixed gas density relay body 1, a pressure sensor 2, a temperature sensor 3, an electric valve 4, a pressure adjustable mechanism 5, an online check contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is communicated with the equipment connecting joint, and the other end of the valve 4 is communicated with the base, the pressure sensor 2 and the pressure adjustable mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjustable mechanism 5 are arranged on the rear side of the shell of the density relay body 1. And the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the equipment connecting joint. The pressure sensor 2 is communicated with the pressure detector on the gas path through the base; the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. Unlike embodiment 1, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure-adjustable mechanism 5 are provided on the housing rear side of the density relay body 1.

Example 4

Referring to fig. 5, the present embodiment discloses a gas density relay with online verification, comprising: gas density relay body 1, pressure sensor 2, temperature sensor 3, solenoid valve 4, pressure adjustable mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, connecting pipe 14. One end of the valve 4 is hermetically connected with the equipment connecting joint 1010, and the other end of the valve 4 is communicated with the connecting pipe 14, the pressure sensor 2 and the pressure adjustable mechanism 5. The pressure sensor 2 and the pressure adjustable mechanism 5 are communicated with the pressure detector through a connecting pipe 14. The pressure sensor 2, the pressure adjustable mechanism 5 and the pressure detector are communicated on the gas path. The density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjustable mechanism 5, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged in a shell; the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The difference from embodiment 1 is that the density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjustable mechanism 5, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged in one casing. 1. The pressure-adjustable mechanism 5 of the present embodiment is mainly composed of a piston 51 and a driving member 52. The piston 51 is hermetically connected with a pressure detector of the gas density relay and the pressure sensor 2 to form a reliable sealed cavity. The pressure adjustable mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the piston 51 to move, and further the volume of the sealed cavity is changed, and the pressure is lifted. 2. The pressure sensor 2 and the temperature sensor 3 are arranged in the shell, and can also be directly gas density transmitters which are combined together, so that the density value, the pressure value and the temperature value of the gas can be directly obtained. Through this pressure adjustable mechanism regulation pressure for the action of contact takes place for gas density relay, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled the density value when unit 7 moves according to gas density relay's contact, pressure value and temperature value even. And detecting an alarm and/or a locking contact action value and/or a return value of the gas density relay to finish the checking work of the gas density relay. Or the checking work of the gas density relay is finished only by detecting the alarm and/or the locking contact action value of the gas density relay. If the pressure detector, the pressure sensor and the like of the gas density relay are matched and normal, the gas density relay and the electrical equipment are normal. Therefore, the gas density relay (or/and the transmitter) can be verified without manual work on site, and the whole service life can be free of manual verification. Unless the pressure detector and the pressure sensor of the gas density relay of one electric device in the substation are inconsistent and abnormal, maintenance personnel are arranged to deal with the failure. And for the anastomotic and normal, the verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.

Example 5

Referring to fig. 6, the present embodiment discloses a gas density relay with online verification, comprising: gas density relay body 1, pressure sensor 2, temperature sensor 3, solenoid valve 4, pressure adjustable mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. One end of the electromagnetic valve 4 is hermetically connected to the equipment connecting joint, and the other end of the electromagnetic valve 4 is communicated with the pressure detector. The relay body 1, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay on a gas path; the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay on a gas path. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The difference from embodiment 1 is that the pressure-adjustable mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving member 52. The pressure adjustable mechanism 5 enables the driving component 52 to push the air bag 53 to change in volume according to the control of the intelligent control unit 7, and then completes the lifting of the pressure. Through this adjustable mechanism of pressure regulation pressure, make gas density relay take place the contact action, the contact action passes through online check-up contact signal sampling unit 6 and transmits to intelligence accuse unit 7, and intelligence accuse unit 7 converts into corresponding density value according to pressure value and the temperature value when the contact of gas density relay moves, detects the warning of gas density relay and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work.

Example 6

Referring to fig. 7, the present embodiment discloses a gas density relay with online verification, comprising: gas density relay body 1, pressure sensor 2, temperature sensor 3, valve 4, adjustable mechanism of pressure 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9. One end of the valve 4 is hermetically connected with the equipment connecting joint, and the other end of the valve 4 is connected with the multi-way joint 9. The gas density relay body 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way connector 9, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure adjustable mechanism 5 is arranged on the multi-way joint 9, and the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay; the temperature sensor 3, the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The difference from embodiment 1 is that 1, the pressure adjustable mechanism 5 of the present embodiment is mainly composed of the bellows 54 and the driving member 52. The corrugated pipe 54 is hermetically connected with the pressure detector of the gas density relay body 1 to form a reliable sealed cavity. The pressure adjustable mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the corrugated pipe 54 to change the volume, and then the volume of the sealed cavity changes, and the pressure is lifted. Through this pressure adjustable mechanism 5 regulation pressure for the contact action takes place for gas density relay, and the contact action passes through online check-up contact signal sampling unit 6 and transmits to intelligence accuse unit 7, and the unit 7 is controlled to intelligence according to pressure value and temperature value when the contact of gas density relay moves, converts into corresponding density value, detects gas density relay's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work.

Example 7

Referring to fig. 8, the present embodiment discloses a gas density relay with online verification, comprising: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the equipment connecting joint, and the other end of the valve 4 is communicated with the pressure detector of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1. The pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. In contrast to embodiment 1, the valve 4 is sealed inside the housing 41, and the control cable of the solenoid valve 4 is led out through the lead-out wire seal 42 which is well sealed with the housing, so that the design ensures that the solenoid valve 4 can reliably ensure sealing for a long time and can reliably operate for a long time. The pressure adjustable mechanism 5 is sealed in the shell 55, and a control cable of the pressure adjustable mechanism 5 is led out through a leading-out wire sealing piece 56 which is well sealed with the shell 55, so that the design ensures that the pressure adjustable mechanism 5 can reliably guarantee sealing for a long time and can reliably work for a long time. The housing 55 and the housing 41 may be integrated into one. Through this pressure adjustable mechanism 5 regulation pressure for gas density relay takes place the contact action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is converted to corresponding density value according to pressure value and temperature value when the contact of gas density relay moves, detects the warning of gas density relay and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work.

Example 8

Referring to fig. 9, the present embodiment discloses a gas density relay with online verification, comprising: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is connected with the equipment connecting joint, the other end of the valve 4 is connected with the pressure adjustable mechanism 5, and the pressure sensor 2 is arranged on the pressure adjustable mechanism 5. Temperature sensor 3, online check-up contact signal sampling unit 6, intelligent control unit 7, gas density relay body 1 set up on adjustable mechanism of pressure 5. The pressure detector, the pressure sensor 2 and the pressure adjustable mechanism 5 of the gas density relay body 1 are communicated on a gas path. The temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The pressure adjustable mechanism 5 of the present embodiment is mainly composed of a piston 51 and a driving member 52. One end of the piston 51 is hermetically connected with a pressure detector, a pressure sensor, a valve 4 and the like of the gas density relay to form a reliable sealed cavity. The pressure adjustable mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the piston 51 to move, the volume of the sealed cavity is changed, and the pressure is lifted. The driving part 52 is arranged outside the sealed cavity, the piston 51 is arranged inside the sealed cavity, and the driving part 52 uses electromagnetic force to push the piston 51 to move, namely the piston 51 is moved by the magnetic force between the piston 51 and the driving part 52. Through this adjustable mechanism of pressure regulation pressure for the action of contact takes place for gas density relay, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled the density value when unit 7 moves according to gas density relay's contact, pressure value and temperature value even. And detecting an alarm and/or a locking contact action value and/or a return value of the gas density relay to finish the checking work of the gas density relay. Or the gas density relay is checked only by detecting the alarm and/or the action value of the locking contact of the gas density relay.

Example 9

Referring to fig. 10, the present embodiment discloses a gas density relay with online verification, comprising: gas density relay body 1, pressure sensor 2, temperature sensor 3, valve 4, adjustable mechanism of pressure 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9. One end of the valve 4 is communicated with the equipment connecting joint, and the other end of the valve 4 is connected with the multi-way joint 9. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the multi-way connector 9; the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure adjustable mechanism 5 is arranged on the multi-way joint 9, and the pressure adjustable mechanism 5 is communicated with a pressure detector of the gas density relay body 1; the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together; the temperature sensor 3 is disposed near the gas density relay body 1, or near a temperature compensation element inside its housing. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. The obvious difference from embodiment 1 is that the pressure adjustable mechanism 5 of the present embodiment mainly comprises an air chamber 57, a heating element 58, a heat preservation member 59, and a temperature sensor 510. The air chamber 57 is externally (or internally) provided with a heating element 58, and the temperature is changed by heating, so that the pressure is increased or decreased. Through this adjustable mechanism of pressure regulation pressure for gas density relay 1 takes place the contact action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is converted into corresponding density value according to pressure value and temperature value when gas density relay 1's contact action, detects gas density relay 1's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work. Member 58 could also be replaced with a refrigeration element.

The working principle of embodiment 9 of the invention is as follows:

when the density relay needs to be checked, the device sends out an instruction to heat the heating element 58 of the pressure adjustable mechanism 5, and when the temperature value T of the temperature sensor 510 of the pressure adjustable mechanism 5 is detected₅₁₀After the temperature difference between the gas density relay body and the temperature value T of the temperature sensor 3 reaches a set value, the device or the system sends an instruction, namely the valve 4 can be closed through the intelligent control unit 7, so that the gas density relay body 1 is isolated from the equipment connecting joint on the gas path and further isolated from the electrical equipment; and then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the closed gas chamber 57 of the pressure adjustable mechanism 5, so that the density relay generates alarm and/or locking contact action respectively, transmitting the contact action to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and detecting the alarm and/or locking contact action value and/or return value of the gas density relay by the intelligent control unit 7 according to the density value of the alarm and/or locking contact action, thereby completing the checking work of the gas density relay 1.

Example 10

Referring to fig. 11, the present embodiment discloses a gas density relay with online verification, comprising: gas density relay body 1, pressure sensor 21, pressure sensor 22, temperature sensor 31, temperature sensor 32, valve 4, pressure adjustable mechanism5. The online checking contact signal sampling unit 6, the intelligent control unit 7 and the equipment connecting joint 1010. One end of the equipment connecting joint 1010 is hermetically connected to the gas insulated electrical equipment during operation, and the other end of the equipment connecting joint 1010 is communicated with the valve 4; and the other end of the valve 4 is in communication with a pressure adjustable mechanism 5. The gas density relay body 1, the temperature sensor 31, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together and arranged on the pressure adjustable mechanism 5; the pressure sensor 21 is provided on the pressure-adjustable mechanism 5. The pressure sensor 22 and the temperature sensor 32 are provided on the device connection joint 1010 side (the side where the valve 4 is connected to the connection joint 1010). The pressure sensor 21 and the pressure detector of the gas density relay body 1 are communicated with the pressure adjustable mechanism 5 on the gas path; the pressure sensor 21, the pressure sensor 22, the temperature sensor 31 and the temperature sensor 32 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. Unlike embodiment 1, there are 2 pressure sensors, which are a pressure sensor 21 and a pressure sensor 22; there are 2 temperature sensors, namely a temperature sensor 31 and a temperature sensor 32. The temperature sensor 32 may also be omitted in this case. The gas density relay with online verification in the embodiment 10 of the invention is provided with a plurality of pressure sensors and temperature sensors. The purpose of this is: the pressure values monitored by the pressure sensor 21 and the pressure sensor 22 can be compared and verified mutually; the pressure values monitored by the temperature sensor 31 and the temperature sensor 32 can be compared and verified with each other; the density value P1 obtained by monitoring the pressure sensor 21 and the temperature sensor 31₂₀The density value P2 obtained by monitoring the pressure sensor 22 and the temperature sensor 32₂₀Comparing and checking each other; even the density value Pe of the rated value of the gas density relay can be obtained through online verification₂₀And comparing and checking each other. As long as the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32 and the gas density relay are matched and normal with each other, it can be stated that the gas density relay and the gas density relay are normal. Thus, the user does not need to manually get toThe gas density relay is verified on site, and manual verification can be omitted in the whole service life. Unless the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32 and the gas density relay of one electric device in the substation are inconsistent and abnormal with each other, the maintenance personnel are arranged to process the abnormal conditions. And the coincident and normal operation is not checked, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.

Example 11

Referring to fig. 12, the present embodiment discloses a gas density relay with online verification, comprising: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. The pressure adjustable mechanism 5 of the present embodiment is mainly composed of an electromagnetic valve 5 and a housing 55. The pressure adjustable mechanism 5 is controlled by the intelligent control unit 7, so that the electromagnetic valve 5 is opened, pressure changes occur, and then the pressure is lifted. Through this pressure adjustable mechanism 5 (solenoid valve) regulated pressure for the action of gas density relay takes place the contact, and the contact action passes through online check-up contact signal sampling unit 6 and transmits to intelligence accuse unit 7, and intelligence accuse unit 7 converts into corresponding density value according to pressure value and temperature value when gas density relay's the contact action, detects gas density relay's warning and/or shutting contact action value. After gas density relay's contact action value check-up was accomplished, unit 7 is just closed solenoid valve 5 is controlled to the intelligence, then open solenoid valve 4, take place pressure variation, and then accomplish the rising of pressure, make gas density relay take place the contact and reset, the contact resets and passes to intelligence through online check-up contact signal sampling unit 6 and control unit 7, pressure value and temperature value when intelligence is controlled unit 7 and is reset (return) according to gas density relay's contact, convert into corresponding density value, detect gas density relay's warning and/or shutting contact return value, and then accomplish gas density relay's check-up work.

Example 12

The embodiment discloses a gas density relay with online check, include: the gas density relay device comprises a gas density relay device body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an equipment connecting joint (a self-sealing valve or a self-sealing valve joint) 1010, a micro-water sensor 13 and a decomposition product sensor 15. When the gas insulated electric equipment runs, one end of the equipment connecting joint 1010 is connected to the gas insulated electric equipment in a sealing mode, the other end of the equipment connecting joint 1010 is communicated with the valve 4, and the equipment connecting joint 1010 is a self-sealing valve type joint or a self-sealing valve joint. And the other end of the valve 4 is connected to a multi-way joint 9. The gas density relay body 1, the pressure sensor 2, the pressure adjustable mechanism 5, the micro-water sensor 13 and the decomposition product sensor 15 are arranged on the multi-way joint 9; the temperature sensor 3 is provided on the equipment connection fitting 1010 or the gas insulated electric equipment. The online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the micro-water sensor 13, the decomposition product sensor 15 and the intelligent control unit 7 are connected. The pressure sensor 2 and the pressure detector of the gas density relay are communicated with the pressure adjustable mechanism 5 on the gas path; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with an intelligent control unit 7. In contrast to the first exemplary embodiment, the temperature sensor 3 is arranged on the device connection 1010 or on the gas-insulated electrical device; and the gas insulated electric equipment also comprises a micro water sensor 13 and a decomposition product sensor 15, and can monitor the micro water content and the decomposition product content of the gas insulated electric equipment.

Example 13

The embodiment discloses a gas density relay with online check, include: the gas density relay comprises a gas density relay body 1, a pressure sensor 21, a pressure sensor 22, a temperature sensor 31, a temperature sensor 32, a valve 4, a pressure adjustable mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a connector 16 and an equipment connecting joint (a self-sealing valve or a self-sealing valve joint) 1010. One end of the connector 16 is hermetically connected to an equipment connection joint (self-sealing valve or self-sealing valve joint) 1010, and the other end of the connector 16 is communicated with the valve 4; the other end of the valve 4 is connected with a multi-way joint 9, the valve 4 is sealed in a shell 41, and the electromagnetic valve 4The control cable is led out through a leading-out wire sealing piece 42 which is well sealed with the shell, and the design ensures that the electromagnetic valve 4 can reliably guarantee sealing for a long time and can reliably work for a long time. The gas density relay body 1, the pressure sensor 21, the temperature sensor 31 and the pressure adjustable mechanism 5 are arranged on the multi-way joint 9. The pressure adjustable mechanism 5 is sealed in the shell 55, and a control cable of the pressure adjustable mechanism 5 is led out through a leading-out wire sealing piece 56 which is well sealed with the shell 55, so that the design ensures that the pressure adjustable mechanism 5 can reliably guarantee sealing for a long time and can reliably work for a long time. The pressure sensor 22 and the temperature sensor 32 are arranged on the connecting head 16. When the valve 4 is opened, the pressure sensor 21, the pressure sensor 22 and the pressure detector of the gas density relay body 1 are communicated with the pressure adjustable mechanism 5 on the gas path. When the valve 4 is closed, the pressure sensor 21 and the pressure detector of the gas density relay body 1 are communicated with the pressure adjustable mechanism 5 on the gas path, and the pressure sensor 22 is not communicated with the pressure detector of the gas density relay body 1 and the pressure adjustable mechanism 5 on the gas path. The pressure sensor 21, the pressure sensor 22, the temperature sensor 31 and the temperature sensor 32 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjustable mechanism 5 is connected with the intelligent control unit 7. Different from the first embodiment, there are 2 pressure sensors, which are pressure sensor 21 and pressure sensor 22; there are 2 temperature sensors, namely a temperature sensor 31 and a temperature sensor 32. The gas density relay with online verification provided by the embodiment thirteen of the invention has a safety protection function, and specifically comprises the following components: 1) when the density value obtained by monitoring the pressure sensor 21 and the temperature sensor 31 or the pressure sensor 22 and the temperature sensor 32 is lower than the set value, the gas density relay automatically does not verify the density relay and sends out a notification signal. For example, when the gas density value of the device is less than the set value, it is not verified. Only when the gas density value of the equipment is more than or equal to (locking pressure +0.02MPa), the verification can be carried out. The alarm of the contact point has a state indication. 2) Or during verification, when the valve 4 is closed, according to the density values monitored by the pressure sensor 22 and the temperature sensor 32When the air density is lower than the set value, the air density relay automatically does not check the density relay and sends out an informing signal (air leakage). For example, when the gas density value of the plant is less than the set value (lock pressure +0.02MPa), it is not verified. The set value can be set arbitrarily as required. Meanwhile, the gas density relay is also provided with a plurality of pressure sensors and temperature sensors for mutual verification, and the sensors and the gas density relay body 1 for mutual verification, so that the gas density relay is ensured to work normally. Comparing the pressure values obtained by monitoring by the pressure sensor 21 and the pressure sensor 22, and checking each other; comparing the pressure values obtained by monitoring by the temperature sensor 31 and the temperature sensor 32, and checking each other; according to the density value P1 monitored by the pressure sensor 21 and the temperature sensor 31₂₀The density value P2 obtained by monitoring the pressure sensor 22 and the temperature sensor 32₂₀Comparing and checking each other; it is even possible to verify the density value Pe of the nominal value of the gas density relay body 1₂₀And comparing and checking each other. The same objective is also: the pressure values monitored by the pressure sensor 21 and the pressure sensor 22 can be compared and verified mutually; the pressure values monitored by the temperature sensor 31 and the temperature sensor 32 can be compared and verified with each other; the density value P1 obtained by monitoring the pressure sensor 21 and the temperature sensor 31₂₀The density value P2 obtained by monitoring the pressure sensor 22 and the temperature sensor 32₂₀Comparing and checking each other; even the density value Pe of the rated value of the gas density relay body 1 can be checked and obtained on line₂₀The two are compared and verified against each other. As long as the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32, and the gas density relay body 1 are matched and normal with each other, it can be said that the gas density relay is normal. Therefore, the gas density relay can be verified without manual work on site, and the whole service life can be free of manual verification. Except for the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32 and the gas density relay body 1 of one electric device in the substationIf the conditions are inconsistent and abnormal, the maintenance personnel are arranged to deal with the conditions. And for the anastomotic and normal conditions, the verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.

Referring to fig. 13, the online verification contact signal sampling unit 6 is mainly composed of an optical coupler OC1 and a resistor R1. The method comprises the following steps: when the contact PJ of the gas density relay is closed, the optical coupler OC1 is conducted, and the OUT6 is low level. On the contrary, when the contact PJ of the gas density relay is opened, the optical coupler OC1 is not conducted, and the OUT6 is high level. The intelligent control unit 7 mainly comprises a processor U1 and a power supply U2. The contact sampling unit 6 can be formed by flexibly combining a switch, an electric contact, an optical coupler, a thyristor, a DI (direct current), a relay, an MOS (metal oxide semiconductor) field effect transistor, a triode, an MOS FET (metal oxide semiconductor) relay, a solid-state relay, a time relay, a power relay, a current sensor (such as a Hall current sensor, a direct current sensor and an alternating current sensor), a current transformer, a voltage sensor (such as a Hall voltage sensor, a direct current voltage sensor and an alternating current voltage sensor), a voltage transformer, a current detector, a voltage detector and the like. Of course, the online verification contact signal sampling unit 6 and/or the intelligent control unit 7 further include several wire holders, electrical connectors, capacitors, resistors, and other electronic and electrical components.

Referring to fig. 14, the online verification contact signal sampling unit 6 mainly comprises an optical coupler OC1, an optical coupler OC2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1-D4, and the like. This circuit makes it possible to know whether the gas density relay contact PJ is open or closed. The method comprises the following steps: when the contact PJ of the gas density relay is closed, a voltage drop exists between the diode D1-D2 or the diode D3-D4, the optical coupler OC1 and/or the optical coupler OC2 are triggered to be conducted, and the high level exists at the OUT6 position. On the contrary, when the contact PJ of the gas density relay is disconnected, no voltage drop exists between the diode D1-D2 or the diode D3-D4, the optical coupler OC1 and/or the optical coupler OC2 are not conducted, and the position OUT6 is at a low level. This makes it possible to know the state of the gas density relay contact PJ whether it is open or closed. And the intelligent control unit 7 is combined to correspondingly process whether the gas density relay contact PJ is in an open or closed state and upload. Therefore, the gas density relay can conveniently monitor the contact signal PJ state of the gas density relay and remotely transmit the state of the contact signal PJ state. The contact signal state of the gas density relay can be known in the background: the open or closed state is realized, so that one more layer of monitoring is realized, and the reliability is improved. The intelligent control unit 7 mainly comprises a processor U1 and a power supply U2.

Referring to fig. 15, the online verification contact signal sampling unit 6 is mainly composed of hall current sensors H1 and H2. When the gas density relay contacts are closed, the hall current sensors H1 and H2 sense the current. Meanwhile, the open or closed state of the contact of the gas density relay can be known through the circuit. The intelligent control unit 7 mainly comprises a processor U1, a power supply U2, a communication module U3, a protection circuit U4, a data storage U6 and the like. The intelligent control unit 7 mainly comprises a processor U1, a power supply U2, a communication module U3, a protection circuit U4, a display and output U5, a data storage U6 and the like. The communication mode of the communication module U3 may be wired: such as RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar and the like. The protection circuit U4 may be: the circuit comprises an anti-static interference circuit (such as ESD and EMI), an anti-surge circuit, an electric quick protection circuit, an anti-radio frequency field interference circuit, an anti-pulse group interference circuit, a power supply short circuit protection circuit, a power supply reverse connection protection circuit, an electric contact misconnection protection circuit, a charging protection circuit and the like. The protection circuits can be formed by one or a plurality of flexible combinations. And display and output U5 may be: the digital tube, the LED, the LCD, the HMI, the display, the matrix screen, the printer, the fax, the projector, the mobile phone and the like can be flexibly combined by one or a plurality of. The data store U6 may be: FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched paper tapes, optical disks, U disks, discs, films, etc., can be flexibly combined by one or more types. Meanwhile, when the contact PJ of the gas density relay is closed, the optical coupler OC1 is triggered to be conducted, and the level at OUT6 is low. On the contrary, when the contact PJ of the gas density relay is opened, the optical coupler OC1 is not conducted, and the OUT6 is high level. This makes it possible to know whether the gas density relay contact PJ is open or closed.

Referring to fig. 16, the online verification contact signal sampling unit 6 is mainly composed of thyristors SCR1 to SCR 4. The online check contact signal sampling unit 6 can also be formed by mixing a solid-state relay or an electromagnetic relay and a Silicon Controlled Rectifier (SCR) flexibly. The intelligent control unit 7 mainly comprises a processor U1, a power supply U2, a communication module U3, a protection circuit U4, a display and output U5, a data storage U6 and the like.

Referring to fig. 17, the online verification contact signal sampling unit 6 mainly comprises an optical coupler OC1, an optical coupler OC2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1-D4, and the like. The circuit can determine whether the gas density relay contact is open or closed. The intelligent control unit 7 mainly comprises a processor U1, a power supply U2, a communication module U3, a protection circuit U4, a data storage U6 and the like.

Referring to fig. 18, the intelligent control unit 7 mainly includes a processor U1, a power supply U2, a communication module U3, a protection circuit U4, a display, output and operation U5, and a data storage U6. The processor U1 contains a crystal oscillator and filter circuitry. The protection circuit U4 includes a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module.

Referring to fig. 19, the intelligent control unit 7 mainly includes a processor U1, a power supply U2, a communication module U3, a protection circuit U4, and the like. The processor U1 contains a crystal oscillator and filter circuitry. The protection circuit U4 includes a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module. The analog pressure sensor 2 passes through the overvoltage protection circuit, the operational amplification circuit, the modulation circuit and the filter circuit to the processor U1. In the communication module U3, the communication chip is connected to the communication interface through the surge protection circuit.

Referring to fig. 20, the 4-20mA type density transmitter is mainly composed of a microprocessor, a power supply, a modulation circuit, a current loop, a protection circuit, a pressure sensor, an operational amplifier, a temperature sensor, a proportional modulation module, a voltage reduction module and the like, and is specifically shown in fig. 22. The microprocessor contains a crystal oscillator and a filter circuit. The protection circuit comprises a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit and the like. After the analog pressure sensor passes through the overvoltage protection circuit, the analog pressure sensor passes through the operational amplifier circuit, reaches the modulation circuit, and then passes through the filter circuit to the microprocessor, so that the microprocessor can acquire a pressure value and an acquired temperature value, and a density value signal is obtained after the microprocessor calculates and converts the temperature value. The density value signal passes through a proportion modulation module, a modulation circuit and a current loop to obtain a density value of 4-20 mA.

In a word, after passing through an amplifying circuit, the simulated pressure sensor, the simulated temperature sensor and the simulated micro-water sensor are converted into A/D (analog to digital) and then are converted into MCU (microprogrammed control unit) to realize the collection of pressure, temperature and moisture. The intelligent control unit 7 can contain or be connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.

Example 14

Referring to fig. 21, the present embodiment discloses a gas density relay with online verification, comprising: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustable mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. And the intelligent control unit comprises: the device comprises a microprocessor U1, a power supply U2, a communication module U3, a protection circuit U4, a valve controller U7, an execution controller U8, a man-machine interface U9, a pressure adjustable mechanism position detection piece 511 and the like. The execution controller U8 may also be referred to as a control system, and may be disposed on the intelligent control unit 7; or the control system or even partial devices are arranged on the pressure adjustable mechanism 5, and the two are closely matched and fused together.

Example 15

The invention discloses a method for checking a gas density relay with online checking, which comprises the following steps:

during normal work, the gas density relay monitors the gas density in the electrical equipment, and meanwhile, the gas density relay can also monitor the gas density value of the electrical equipment on line through the pressure sensor, the temperature sensor and the intelligent control unit.

step S1: the valve 4 is closed by an intelligent control unit;

step S2: and the online check contact signal sampling unit 6 is adjusted to a check state through the intelligent control unit 7. When the verification state, cut off density relay contact signal control circuit, density relay contact signal is connected to intelligence accuse unit 7.

Step S3: control unit 7 drive adjustable pressure mechanism 5 through the intelligence, make gas pressure slowly descend, make gas density relay take place the contact action, the contact action is passed through online check-up contact signal sampling unit 6 and is transmitted to intelligence accuse unit 7, intelligence accuse unit 7 obtains the density value according to pressure value, temperature value when the contact action, or directly obtains the density value, detect out gas density relay's contact signal (warning or shutting the contact) action value, accomplish gas density relay's contact signal action and be worth the check-up work.

Step S4: control unit 7 drive adjustable pressure mechanism 5 through the intelligence, make gas pressure slowly rise, make gas density relay take place the contact and reset, the contact signal resets and transmits intelligence through online check-up contact signal sampling unit 6 and controls unit 7, pressure value when intelligence is controlled unit 7 and is reset according to the contact, the temperature value obtains the density value, or directly obtains the density value, detect out gas density relay's contact signal (warning or shutting the contact) return value, accomplish gas density relay's contact signal return and be worth the check-up work.

Step S5: after all the contact signal verification work is completed, the intelligent control unit 7 opens the valve 4. And the online check contact signal sampling unit 6 is adjusted to be in a working state through the intelligent control unit 7. And in the working state, the gas density relay contact signal control loop returns to the normal state. After the on-line calibration of the gas density relay is completed, the gas density relay automatically restores to the working state, the valve 4 is opened at the moment, the on-line calibration contact signal sampling unit 6 is adjusted to the working state, and the gas density relay contact signal control loop restores to the normal working state.

The gas density relay can automatically carry out comparison and judgment. After the gas density relay completes the calibration work of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. After the verification work of the gas density relay is finished, if abnormity occurs, the intelligent control unit can upload an alarm contact signal of the density relay. The density value and the verification result are displayed on site or on the background, and the specific mode can be flexible.

The intelligent control unit can be controlled on site through the gas density relay, or can be controlled through a background or the two units are mutually interacted.

The gas density relay can monitor the gas density value, the pressure value and the temperature value of the electrical equipment on line, and the gas density of the electrical equipment is monitored on line.

Example 16

Referring to fig. 22-24, the present invention discloses a monitoring system with an online self-verifying gas density relay, comprising: the high-voltage electrical equipment with the sulfur hexafluoride gas chamber and the gas density relays with online check are connected with the remote background detection system sequentially through the concentrator and the protocol converter; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chambers.

Further, a monitoring system with an online self-verifying gas density relay, comprising: the high-voltage electrical equipment with the sulfur hexafluoride gas chamber and the gas density relays with online check are connected with the remote background detection system through the concentrator and the IEC61850 protocol converter in sequence; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chambers.

As shown in fig. 23 and 24, the PC is an online monitoring background host and system, the Gateway is a network switch, the Server is an integrated application Server, the ProC is a protocol converter/online monitoring intelligent unit, the HUB is a HUB, and Z is a gas density relay with online verification. The online monitoring system architecture: the system diagrams of a simple architecture (fig. 23), a conventional architecture (fig. 24), a complex architecture, and the like are detailed. System architecture diagram and brief description: 1. a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2. Background software key business module, basic function: such as rights management, device management, data storage queries, etc.; and user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data acquisition, data analysis, recording conditions, exception handling. 3. Interface configuration: such as Form interface, Web interface, configuration interface, etc. Fig. 24 is a system diagram of a wireless transmission mode, in which a dashed box indicates that a wireless module W and a gas density relay Z with online verification can be integrated or separated, and the specific scheme can be flexible.

Besides on-line checking of the gas density relay, the SF inside the electrical equipment such as a circuit breaker, a GIS and the like can be monitored in real time₆Physical quantities such as temperature, pressure, density and micro-water of gas and variation trend thereof, and a communication interface, and data are uploaded to a background system to realize SF of electrical equipment such as a circuit breaker and a GIS₆The online monitoring function of physical quantities such as gas density, micro water and the like can flexibly set an alarm limit, historical data can be inquired on site, the air leakage trend and the air leakage rate of the equipment can be accurately analyzed and judged, and the abnormal condition of the equipment can be found in advance, so that the safe operation of the whole set of system of the electrical equipment and the transformer substation can be guaranteed. The on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station, is really realized. The configuration principle is as follows: the gas online monitoring system is constructed by adopting a bus type layered distribution structure, and the requirements of a three-layer system structure of an intelligent substation are met: process layer (sensor layer, i.e. gas density relay with on-line check), spacing layer (data transmission, acquisition and processing layer), station control layer (monitoring host, database server, etc.), wholeThe system can be accessed into the integrated intelligent substation online monitoring system, and an IEC61850 standard electric power communication protocol is adopted. The monitoring background system is responsible for collecting, comprehensively analyzing, diagnosing faults, storing and forwarding standardized data of monitoring data and has the functions of real-time data display, change trend analysis, historical data query, real-time alarm and the like. The on-line monitoring of the gas density and the micro water of the high-voltage electrical equipment can be realized without going to the site through the monitoring system, the on-line checking and detection of the gas density relay can be realized, and the SF can be analyzed through expert analysis software, big data and trend analysis₆The condition maintenance of the electrical equipment provides a solid basis, meets the requirements of power grid automation and equipment condition maintenance, and plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.

The monitoring system comprises an online self-checking gas density relay, wherein the hub adopts an RS485 hub, and the IEC61850 protocol converter is also respectively connected with the network service printer and the network data router.

The monitoring system with the online self-checking gas density relay has the advantages that the communication modes of the plurality of online self-checking gas density relays are wired or wireless. Wired communication modes comprise industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carriers and the like; the wireless communication mode is that the sensor embeds 5G/NB-IOT communication module (for example 5G, NB-IOT), 2G/3G/4G/5G etc. WIFI, bluetooth, Lora, loraan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar etc. upload various sensor data to thing networking cloud platform.

The self-checking gas density relay mainly comprises a gas path (capable of passing through a pipeline) connecting part, a pressure adjusting part, a signal measurement control part and the like. The self-checking gas density relay is compact and reasonable in structural arrangement, each component has good rust-proof and shock-proof capabilities, and the self-checking gas density relay is firm to mount and reliable to use. The connection, the dismouting of each pipeline of gas density relay are easily operated, and equipment and part are convenient to be maintained. The structural design of the gas density relay enables the gas density relay to safely perform the following work: the pipeline connecting part should be well sealed, the sealing performance is expressed by absolute air leakage rate, and the value of the absolute air leakage rate is not more than 10-9 Pa.m 3/s; the self-checking gas density relay has automatic or manual boosting and reducing functions; the temperature sensor (temperature probe) is mounted close to the location of the on-line check density relay or can be close to the on-line check density relay temperature compensation element.

The self-checking gas density relay mainly has the functions of carrying out online checking measurement on a contact value (a pressure value during alarm/locking action) and/or a rated pressure value of the gas density relay under the working environment temperature, automatically converting the contact value into a corresponding pressure value at 20 ℃, and realizing performance detection on the contact value (alarm and locking) and/or the rated pressure value of the gas density relay on line.

The self-checking gas density relay meets the requirements of the check on the contact of the density relay: the sampling contacts of the on-line checking contact signal sampling unit are provided with three independent groups of contacts, and the on-line checking can be automatically completed on 3 pairs of contacts (such as alarm, first locking, second locking or alarm, locking and overpressure) at the same time. And the action values of alarming, locking one, locking two or overpressure and the like can be continuously measured without replacing the contact or reselecting the contact.

The self-checking gas density relay converts the measured pressure value and temperature value into the pressure value corresponding to 20 ℃ according to the gas characteristics, namely the checking gas density relay has the functions of pressure and temperature measurement and software conversion.

The calibration accuracy of the self-calibration gas density relay can be related to the power industry or national standard. Under different temperatures, the calibration requirements can be according to national standards or industry standards, for example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration regulations, and the accuracy requirements corresponding to each temperature value. That is, the error determination requirements are different and may be defined by standards or otherwise. The comparison and judgment can be carried out in the same period (or in the same season) in different years. For example, the checking result of 5 months in 2021 can be directly compared with the checking result of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, and judgment is carried out. The verification may be performed when verification is required. And a movable design can be carried out, namely the transformer substation A can work for a period of time after the task is completed, and the transformer substation B can work for a period of time after the task is completed. And then moving to the C substation for working.

The checking precision of the self-checking gas density relay can reach 20 degrees to 0.25 grade, and can reach 0.625 grade at high temperature or low temperature. In short, the checking precision of the gas density relay can meet the requirement according to the technical performance of the gas density relay or the requirement of electrical equipment, and the requirement or relevant specifications can be met economically and quantificationally.

In the closed state of the valve 4, the pressure-adjustable mechanism 5 can slowly increase or decrease the load when pressurizing or depressurizing the gas density relay. When measuring the action value of the contact signal of the gas density relay, the load change speed is not more than 1-10 per second of the measuring range when approaching the action value, even better, and the signal is switched to stop. And reading the actual load value during signal switching and carrying out correlation conversion.

And converting the pressure value, namely the density value, corresponding to 20 ℃ by software according to the acquired pressure and temperature and the gas pressure-temperature characteristic. For example, for SF₆For gases, the Betty-Bridgman equation can be used for the calculation. For SF₆For mixed gases, calculations can be made based on the law of dalton partial pressure, the Betty-Bridgman equation, the equation of state of the ideal gas.

The online checking contact signal sampling unit 6 and the intelligent control unit 7; the gas density relay is connected with the intelligent control unit through the online check contact signal sampling unit. The wireless communication mode is LORA, and a 5G/NB-IOT communication module is arranged in the sensor. Such as 5G, NB-IOT, LoRaWAN and the like, and uploads sensor data of various pressures, temperatures, densities, micro water and the like to the cloud platform (background) of the Internet of things. The pressure sensor is connected with the intelligent control unit; the pressure adjustable mechanism is a piston adjusting mechanism, and a piston adjusting piece is adjusted through magnetic force or a motor (variable frequency motor) to finish the lifting of pressure; or the piston adjusting piece is adjusted through the reciprocating mechanism to finish the lifting of the pressure; or the pressure is lifted by adjusting the piston adjusting piece through the Carnot cycle mechanism. The piston can adopt magnetic fluid seal or conventional seal; the piston may be provided with several seals, or no seals. Without a sealing element, the speed of the piston can be adjusted to realize that the pressure load change speed is not more than 5 per thousand of the measuring range per second, namely the piston can be incompletely sealed, and the pressure can be increased or reduced in the dynamic state of the piston motion. The pressure adjustable mechanism can cause volume change under the action of temperature change and external force (magnetic force or a motor and the like), so that pressure rise and fall are changed. Namely a mixed type pressure adjustable mechanism with the temperature and the external force acting together.

The on-line verification of the alarm and the locking contact of the density relay can be realized, the rated pressure value of the density relay can be verified on line, and even other pressure values are verified, for example, under the environment temperature of 20 ℃, a signal is output by the pressure value needing to be verified, namely, the rated pressure value of the gas density relay or other pressure values needing to be verified have a contact signal to output a verification signal (a contact closing or opening signal can be output). Can be through this check-up signal, the intelligence is controlled the unit and is in time gathered the pressure value this moment, and this pressure value is compared with the pressure value that needs the check-up, just can know the error of this pressure value that wants the check-up. The gas density relay may also be self-tested with an indication of the operating conditions of the associated components.

The control of the valve can adopt various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear, bevel gear drive and the like; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valves may be driven in automatic, power actuated and manual modes. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valves are connected, either directly or indirectly, integrally or separately, to the electrical equipment through self-sealing valves, manual valves, or non-removable valves. The valve may be normally open or normally closed, as desired. The valve is of the one-way type, or of the two-way type. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc.

The self-checking gas density relay can realize the following functions: 1. performing on-line monitoring on gas density, or realizing on-line monitoring on gas density and micro-water, or realizing on-line monitoring on gas density, micro-water and content of decomposition products; 2. the on-line verification of the density relay (the contact signal value and the display value of the density relay can be verified on line); 3. the system can be verified by mutual verification of electronic detection (monitoring) and mechanical detection (monitoring), the reliability of the system is realized, and further, the whole service life is free from manual verification. Unless the pressure sensor 2, the temperature sensor 3 and the gas density relay body 1 of one electrical device in the substation are not matched and abnormal with each other, a maintenance worker is arranged to deal with the failure. The coincident and normal operation is not checked, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced; 4. even a zero check of the pressure sensor can be performed.

The self-checking gas density relay has a self-diagnosis function, and can perform self-diagnosis on each element and diagnose a process, such as the monitoring or checking process; the gas density relay has the performance of self checking and comparison.

When online check contact signal sampling unit 6 is at the check-up state, if do not cut off density relay contact signal control circuit, when the check-up, gas density relay's contact signal actuating signal can upload, will make notes: this occurs during calibration and is not due to a drop in actual gas density, which is acceptable if it is clear.

The mounting positions of the gas density relay body, the pressure sensor, the temperature sensor, the pressure adjustable mechanism, the valve, the online check contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: 1. the gas density relay body, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together, are designed integrally and can also be designed in a split mode. Can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. In short, the flexible arrangement is achieved. The structure of the self-checking gas density relay can be very flexible: for example, the valve, the density relay body and the pressure adjustable mechanism can be arranged on the shell or the multi-way joint; the valve can be connected with the equipment connecting joint, and can also be connected through a self-sealing valve or an air pipe. The pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together and are designed integrally; the pressure sensor and the temperature sensor can be combined together and are designed integrally; the online check joint signal sampling unit and the intelligent control unit can be combined together, and are designed integrally. In short, the structure is not limited.

The self-checking gas density relay automatically generates a checking report of the density relay according to a checking result, the report format can be flexible, and the checking result is abnormal, and the report can be alarmed, for example, the report can be networked with a mobile phone and the like or uploaded.

After the gas density relay for online verification finishes the verification work of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the check work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit can upload the alarm contact signal of the density relay to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site, in a word, the gas density relay can be ensured to be reliable in multiple modes and various combinations.

Control of the online verified gas density relay: the method can be realized on site or in the background, or the site and the background are combined and interacted with each other.

The online checking gas density relay has a safety protection function, and particularly, when the online checking gas density relay is lower than a set value, the gas density relay automatically does not check the density relay any more and sends out a notice signal. For example, when the gas density value of the plant is less than the set value P_SIt is not verified. For example, a check can only be made if the gas density value of the plant ≧ 0.02MPa of lock pressure. Alternatively, the contact alarm has a status indication. Especially, when the density value is lower than the alarm, the locking contact is not checked, and the safety of the system is ensured. Specific set point P_SMay be determined according to the requirements of the electrical equipment. The set value P_SCan be converted by a pressure sensor and a temperature sensor, and can also be provided by outputting a signal by a mechanical density relay (for example, adding a density relay between the valve 4 and the electrical equipment); or a set of pressure sensor and temperature sensor is added between the valve 4 and the electrical equipment for conversion.

The gas density relay for online verification can be verified according to set time, and also can be verified according to set temperature (such as extreme high temperature, extreme low temperature, normal temperature, 20 degrees). When the environment temperature of high temperature, low temperature, normal temperature, 20 ℃ is checked, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 levels. The method can be implemented according to the relevant standard according to the temperature requirement.

The online check gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods according to the density relay. Namely, the comparison in the same temperature range at different periods, the performance of the gas density relay is judged. The comparison of each period with history and the comparison of the history and the present are carried out. Experience is performed on the gas density relay. The gas density relay can be checked repeatedly for 2-5 times, and the average value of the gas density relay is calculated. When necessary, the gas density relay can be checked at any time.

The verification result of the online verified gas density relay on the density relay can be uploaded through density online remote transmission; or through wireless uploading; or uploaded by another route; or uploaded separately.

The simple-version density relay on-line verification can upload the abnormal result of the verification result through an alarm signal line or an independent verification signal line. Specifically, the state can be uploaded well or the problem can be uploaded. The verification result can be uploaded through remote density on-line monitoring, or through a single verification signal line, or through on-site display, on-site alarm or wireless uploading, and can be uploaded through the smart phone network.

Pressure sensor types: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor may be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-based pressure sensor. A pressure measurer combining a slide wire resistor through a bourdon tube or a corrugated tube; a pressure measurer combining the induction coil through a bourdon tube or a corrugated tube;

when the system is built, each gas density relay has a separate pressure adjustable mechanism for saving cost, and a plurality of density relays can share one pressure adjustable mechanism.

The signal generator includes: a microswitch or a magnetically assisted electrical contact; the pressure detector includes: a bourdon tube or a bellows tube. The temperature compensation element is a bimetallic strip or a sealed gas chamber sealed with compensation gas. The sealed gas chamber, in which the compensation gas is sealed, for example in a bellows or a bourdon tube, serves for temperature compensation.

SF for electrical equipment without going to the field₆The gas density and the internal micro-water are monitored on line, and the SF of the electrical equipment can be monitored without going to the site₆And carrying out online verification on the gas density relay.

Professional background result analysis can be provided through expert analysis software by means of trend analysis, online measurement of density values and internal micro-water values, online verification data of density relays, test map comparison and the like, test reports are automatically generated, and the SF data analysis system is used for SF data analysis₆And the condition maintenance of the electrical equipment provides a solid basis.

SF for realizing remote online monitoring of electrical equipment₆The gas density and micro-water content states are checked on line to meet the requirements of power grid automation and equipment state maintenance, and the method plays an important role in improving the safe operation and operation management level of the system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance. The computer is used for processing, storing and displaying the data, abundant field data are provided, manual processing is reduced, and the automation level of data processing is improved.

The gas density relay body can be transformed by utilizing the existing transformer substation. And can be modified by using new ones. Or may be an integral design in itself.

The online checking gas density relay has pressure sensors in various forms, and can automatically and accurately test the functions of the absolute pressure type gas density relay and the relative pressure type gas density relay. The absolute pressure structure-absolute pressure display type density relay, the absolute pressure structure-gage pressure display type density relay, the gage pressure structure-absolute pressure display type density relay and the gage pressure structure-gage pressure display type density relay can be tested. The design can be accurately designed according to actual conditions. The gas density relay can output stable gas pressure. The pressure change during manual or automatic pressure rise and fall can be carried out smoothly, the speed when the pressure approaches the set value of the contact signal is not more than 1 per mill to 15 per mill of the measuring range per second, and is not more than 5 per mill of the measuring range generally. The gas density checking relay can measure the rated pressure value, the contact action value, the corresponding return value and the corresponding switching difference of various types of gas density relays.

When the online check contact signal sampling unit is in a non-check state, the online check contact signal sampling unit is relatively isolated from a contact signal of the gas density relay on a circuit, and when the online check contact signal sampling unit is in a check state, a contact signal control loop of the density relay can be cut off, so that a contact signal action signal of the gas density relay is not uploaded during checking, and further, the safe operation of a power grid is not influenced. During on-line calibration, a contact signal of the gas density relay can control a loop power supply by cutting off alarm and locking; after the check is completed, the contact signal (alarm and locking) of the gas density relay is recovered to control the loop power supply, so that the gas density relay can reliably monitor the gas density of the gas insulation equipment.

The intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic, input and output. Or the intelligent control unit automatically controls the whole checking process based on embedded algorithms and control programs of a general computer, an industrial personal computer, an ARM chip, an AI chip, a quantum chip, a photonic chip, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control mainboard, an embedded main control board and the like, and comprises all peripherals, logics and input and output. The self-checking gas density relay mainly has the functions of measuring a contact value (a pressure value during alarm/locking action) and/or a rated pressure value of the gas density relay at the working environment temperature, automatically converting the contact value and/or the rated pressure value into a corresponding pressure value at 20 ℃, realizing performance detection on the contact value (alarm and locking) and/or the rated pressure value of the gas density relay on line and finishing the on-line checking work of the gas density relay. Or, the main function of the gas density relay is to measure the contact value (pressure value during alarm/locking action) and/or rated pressure value of the gas density relay under the working environment temperature, and automatically convert the contact value and/or rated pressure value into the corresponding pressure value at 20 ℃, so as to realize the performance detection of the contact value (alarm and locking) and/or rated pressure value of the gas density relay on line; and the gas density value, the pressure value and the temperature value of the electrical equipment can be monitored on line, so that the gas density of the electrical equipment can be monitored on line. When the intelligent control relay runs, the valve is closed through the intelligent control unit, so that the gas density relay is isolated from the gas insulated electrical equipment on a gas path; the gas pressure is adjusted to rise and fall through the pressure adjustable mechanism, so that the density relay generates contact signal actions, the contact signal actions are transmitted to the intelligent control unit through the online check contact signal sampling unit, the intelligent control unit detects contact signals (alarm or locking contact) action values and/or return values of the gas density relay according to density values of the contact signal actions, and the check work of the gas density relay is completed online. The intelligent control unit collects the pressure sensor and the temperature sensor, and converts the pressure value and the temperature value into a pressure value (namely a density value) of 20 ℃ according to the gas characteristics. Or the gas density relay converts the measured pressure value and temperature value into the pressure value corresponding to 20 ℃ according to the gas characteristics, namely the self-checking gas density relay has the functions of pressure and temperature measurement and software conversion. The self-checking gas density relay is provided with an absolute pressure sensor and a relative pressure sensor according to requirements. The self-checking gas density relay has a man-machine interaction function: the data display interface is provided, and the current data value can be refreshed in real time; the device has a data input function and can input parameter set values; the intelligent control unit of the self-checking gas density relay is provided with an interface: test data storage can be completed; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The electrical interface has a protection function, and the interface cannot be damaged due to misconnection; or/and will not be disturbed by electromagnetic fields. The intelligent control unit also comprises a communication module, and the information such as test data and/or verification results is remotely transmitted through the communication module. The communication mode of the communication module can be a wired mode or a wireless mode. The wired communication mode can be as follows: RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier waves, cable wires and the like; the wireless communication mode can be as follows: NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic waves, sound waves, satellites, light waves, quantum communication, sonar and the like. The self-checking gas density relay also comprises a multi-way joint, and the self-checking gas density relay body, the valve and the pressure adjustable mechanism are arranged on the multi-way joint. The gas density relay also comprises a multi-way joint and a self-sealing valve (or a self-sealing valve joint), and the gas density relay body, the valve, the pressure adjustable mechanism and the self-sealing valve are arranged on the multi-way joint. The valve may be embedded in the multi-way junction. The gas density relay body, the valve and the pressure adjustable mechanism are connected together through a plurality of connecting pipes. The valve is an electric valve, an electromagnetic valve, a permanent magnetic electromagnetic valve, a piezoelectric valve, a temperature-controlled valve, a novel valve which is made of an intelligent memory material and is opened or closed by electric heating, or the valve is closed or opened by a hose bending or flattening mode. The valve is sealed within a chamber or housing. In the valve closed state, the pressure-adjustable mechanism can slowly increase or decrease the load when the gas density relay is boosted or depressurized. When the action value of the contact signal of the gas density relay is measured, the load change speed is not more than 10 per second of the measuring range when the action value is approached. I.e. the pressure is adjustable (can rise or fall smoothly). The pressure adjustable mechanism is a closed air chamber, a heating element is arranged outside or inside the closed air chamber, and the change of the temperature of the gas in the closed air chamber is guided by heating the heating element, so that the lifting of the gas pressure is completed. Or the pressure adjustable mechanism is a closed air chamber, a refrigerating element is arranged outside or inside the closed air chamber, and the change of the temperature of the gas in the closed air chamber is guided through the refrigerating element, so that the lifting of the gas pressure is completed. Or the pressure adjustable mechanism is a closed air chamber, a heating element and a refrigerating element are arranged outside or inside the closed air chamber, and the change of the temperature of the gas in the closed air chamber is guided through the heating element and the refrigerating element, so that the pressure is lifted. Or the pressure adjustable mechanism is a closed air chamber, a semiconductor is arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is conducted through heating or refrigerating the semiconductor, so that the pressure is increased or decreased. The pressure adjustable mechanism is also provided with a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber. The temperature change effect is improved. Or the pressure adjustable mechanism is a piston adjusting mechanism, and the piston adjusting part is adjusted through magnetic force or a motor (variable frequency motor) to finish the lifting of the pressure; or the piston adjusting piece is adjusted through the reciprocating mechanism to finish the lifting of the pressure; or the miniature booster-type electric air pump finishes the pressure lifting; or the stepping motor pushes the piston to finish the lifting of the pressure; or the micro air-pressure pump finishes the lifting of the pressure; or the air compressor (or the air compression pump) completes the pressure rise and fall; or the piston adjusting piece is adjusted through the Carnot cycle mechanism to finish the lifting of the pressure; or the pneumatic element is used for adjusting the piston adjusting piece to finish the lifting of the pressure. Or the pressure adjustable mechanism is an air bag, and the air bag is adjusted through magnetic force or a motor (a variable frequency motor and a stepping motor), or a reciprocating mechanism, or a Carnot circulating mechanism, or a pneumatic element to finish the lifting of the pressure. Or the pressure adjustable mechanism is a corrugated pipe, and the expansion and contraction of the corrugated pipe are adjusted through magnetic force or a motor (variable frequency motor) or a reciprocating mechanism or a Carnot circulating mechanism or a pneumatic element to finish the lifting of the pressure. Or the pressure adjustable mechanism is an air release valve, and the pressure is lifted through the air release valve. Or the pressure adjustable mechanism also comprises a flow valve, and the pressure is lifted through the flow valve and the air release valve. Or the air release valve is an electromagnetic valve 2, or an electric valve 2, or other air release valves realized by electric or gas. Or the pressure adjustable mechanism is a compressor, and the pressure is lifted through the compressor. Or the pressure adjustable mechanism is a pump, and the pressure is lifted through the pump. Or the pump is an air pump, and the pressure is lifted through the air pump. Or the pump is a pressurizing pump, or a boosting pump, or an electric air pump or an electromagnetic air pump. The pressure adjustable mechanism is sealed in a cavity or a shell to ensure sealing. Alternatively, the valve and the pressure adjustable mechanism are sealed in a chamber or housing to ensure sealing. The pressure sensor, the temperature sensor, the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay. The temperature sensor is arranged on or in the housing of the gas density relay. Alternatively, the temperature sensor is disposed in the vicinity of the temperature compensating element of the gas density relay. The online checking contact signal sampling unit and the intelligent control unit are arranged together.

The gas density relay body, the pressure sensor and the temperature sensor are of an integrated structure; or the gas density relay, the pressure sensor and the temperature sensor are integrated into a remote transmission type gas density relay. The remote transmission type gas density relay directly transmits density, pressure and temperature signals. And even the contact signal state of the gas density relay is transmitted remotely. The gas density sensor is a gas density transmitter composed of a pressure sensor and a temperature sensor. Or the density measuring sensor adopting the quartz tuning fork technology, namely the gas density detecting sensor can adopt the density measuring sensor adopting the quartz tuning fork technology, namely the difference between the constant resonance frequency of the quartz oscillator in vacuum and the resonance frequency of the quartz oscillator which is in the same source in the gas to be detected is in direct proportion to the density of the gas to be detected, and the analog signal or the digital signal of the gas density value is obtained after the processing.

The pressure and temperature sensors are of an integrated structure; or a gas density transmitter with integrated pressure and temperature sensors. The gas density transmitter directly transmits density, pressure and temperature signals. And even the contact signal state of the gas density relay can be monitored and transmitted remotely.

The online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density transmitter. The self-checking gas density relay is a remote transmission type density relay.

When the online check contact signal sampling unit is in a non-check state, the online check contact signal sampling unit is relatively isolated from a self-check gas density relay contact signal on a circuit. When the density relay is in a checking state, a contact signal control loop of the density relay can be cut off, and the contact action signal of the gas density relay is not uploaded during checking, so that the safe operation of a power grid is not influenced. Or, pass through photoelectric isolation on the circuit with gas density relay contact signal on online check-up contact signal sampling unit, can ensure when the check-up, the unit safety is controlled to the protection intelligence. The online checking contact signal sampling unit is provided with a protection circuit, so that the intelligent control unit cannot be influenced during checking. The online checking contact signal sampling unit can connect the contact signal of the gas density relay with the intelligent control unit.

The intelligent control unit is arranged on the intelligent control unit and can be used for regularly setting the time for checking the density relay. Or the test time may be recorded. Also comprises a power supply circuit and a recyclable rechargeable battery. Or various suitable power sources such as solar, lithium batteries, etc. The calibration of the density relay can be completed periodically according to the setting or the instruction of the background, namely the time for online calibration of the density relay is set periodically.

The online checking contact signal sampling unit is not lower than 24V for testing the contact signal action value or the switching value of the density relay, namely, during checking, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.

The gas density relay is provided with a rated pressure value output signal which is connected with the intelligent control unit.

When the rated pressure value of the self-checking gas density relay outputs a signal, the intelligent control unit simultaneously collects the current density value, and the checking of the rated pressure value of the gas density relay is completed. The gas density relay can automatically carry out comparison and judgment, and if the error exceeds the set value, an abnormal prompt is sent out: the gas density relay body or the pressure sensor, the temperature sensor have problems. The gas density relay can complete the mutual checking function of the gas density relay body, the pressure sensor, the temperature sensor, the density transmitter and the like.

The self-checking gas density relay can complete mutual checking of a gas density relay body, a pressure sensor, a temperature sensor and the like. When the self-checking gas density relay completes the checking of the gas density relay, mutual comparison and judgment can be automatically carried out, and if the error exceeds the set value, an abnormal prompt is sent out: the gas density relay body or the pressure sensor, the temperature sensor have problems. Namely, the gas density relay can complete the mutual checking function of the gas density relay body, a pressure sensor, a temperature sensor, a density transmitter and the like. The method has the capability of artificial intelligence proofreading.

The self-checking gas density relay comprises a plurality of pressure sensors and temperature sensors, the mutual checking of the test data of the pressure sensors and the temperature sensors and the mutual checking of the test data of the sensors and the gas density relay, and the normal work of the gas density relay is ensured.

The zero bit is put to gas pressure completely to the bleed valve, and the unit is controlled to the intelligence and the pressure value at that time is gathered simultaneously, and the self-checking gas density relay can carry out the pressure zero bit check automatically to judge, if the error exceeds its setting value, will send unusual suggestion: pressure sensors have problems. Namely, the self-checking gas density relay can complete the zero checking function of the pressure sensor.

The self-checking gas density relay can finish the checking of the temperature sensor. The method comprises the following steps: and the gas density relay compares the transmitted environmental temperature value with the sampling value of the temperature sensor.

After the gas density relay is checked, the self-checking gas density relay can automatically generate a check report of the density relay, and if the check report is abnormal, an alarm can be automatically sent out, or the check report can be sent to a designated receiver, for example, a mobile phone.

After the gas density relay is checked, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone.

After the verification work of the gas density relay is finished, if abnormity occurs, the intelligent control unit can upload an alarm contact signal of the density relay. The check-up situation of the gas density relay can be conveniently known by processing through the receiver after uploading. For example: an intelligent control unit contact JD is output through the intelligent control unit and connected to an alarm contact signal of the density relay, and then the contact JD can be regularly closed and opened through the intelligent control unit. If the alarm contact signal control loop is connected with an alarm indicator lamp, the alarm indicator lamp can display regularly (for example, the lamp is lighted for 5s and then is not lighted for 3s, and the like). The contact signal state of the gas density relay can be uploaded through the intelligent control unit, or the remote transmission density relay, or the transmitter; or the alarm contact signal line is uploaded; or uploading both the signals through the intelligent control unit and the alarm contact signal line, namely uploading in a multiple mode. Reliable and at the same time flexible.

The density value and the verification result are displayed on site or on the background, and the specific mode can be flexible. The control of the intelligent control unit can be completed through field control, background control or mutual interaction of the field control and the background control. The self-checking gas density relay has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like. The gas density relay further comprises: a housing; the intelligent control unit and the online check contact signal sampling unit are arranged in the shell.

The core element of the intelligent control unit is a processor formed by integrated circuits. Or the core element of the intelligent control unit is a programmable controller. Or the core element of the intelligent control unit is an industrial personal computer or an industrial computer.

The intelligent control unit and the online check contact signal sampling unit comprise: a single chip microcomputer, or an ARM chip, or an AI chip.

The circuit of the intelligent control unit comprises a protection component, in particular an anti-interference component. The online checking contact signal sampling unit comprises a protection component, in particular an anti-interference component.

The rated pressure value of the gas density relay or other pressure values needing to be verified have contact signal output.

The self-checking gas density relay can monitor the gas density value on line, or the density value, the pressure value and the temperature value. Or, the self-checking gas density relay also comprises a micro-water sensor which can monitor the gas micro-water value on line. Or, the self-checking gas density relay also comprises a micro-water sensor and a gas circulation mechanism, and the micro-water value in the gas can be monitored on line. Or the gas circulation mechanism comprises a capillary tube with a proper length, a sealing chamber and a heating element, the gas flow is realized by heating the heating element, and the micro water value in the gas can be monitored on line. And the self-checking gas density relay also comprises a decomposed product sensor which can monitor the gas decomposed product on line.

The self-checking gas density relay has a self-diagnosis function and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc. The self-checking gas density relay has a safety protection function, and particularly, when the self-checking gas density relay is lower than a set value, the gas density relay automatically does not check the density relay any more and sends out an informing signal. When the environment temperature of high temperature, low temperature, normal temperature, 20 ℃ is checked, the error judgment requirements of the gas density relay can be different, and the method can be implemented according to the temperature requirements and the related standards.

The self-checking gas density relay can compare the error performance of the self-checking gas density relay at different temperatures and different time periods according to the density relay. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the gas density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay can be subjected to physical examination. The gas density relay can be repeatedly checked for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated. When the self-checking gas density relay is necessary, the density relay can be checked at any time. The verification result of the self-verification gas density relay on the density relay can be uploaded in various modes or ways, for example, the uploading can be implemented through density online remote transmission; or through wireless uploading; or uploaded by another route; the signal can be uploaded through an alarm contact signal wire; or uploading separately; or uploaded with other signal packages. The self-checking gas density relay has a gas density relay itself, and whether the density value of the monitored electric device is normal or not is determined. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the gas density relay and the like, can be judged, compared and analyzed.

The self-checking gas density relay is provided with a plurality of pressure sensors and temperature sensors. Multiple monitoring and comparison are carried out, and the reliability is ensured.

The self-checking gas density relay is provided with pressure sensors on two sides of the gas path of the valve 4 respectively. During the check-up, when valve 4 closed, a pressure sensor monitoring electrical equipment's pressure value itself, and then constantly monitoring electrical equipment's density value itself, guarantee that the check-up process is safe. And the other pressure sensor self-checks the pressure value of the gas density relay.

The self-checking gas density relay is provided with density relay or density switch at the front end of valve 4, outputs the signal of a safety check set point, and this signal is connected with the intelligent control unit, and then monitors the density value of electrical equipment itself constantly, guarantees that the check-up process is safe.

When the density of the self-checking gas density relay monitors that the gas pressure is abnormal on line, the checking of the gas density relay can be started, so that the performance of the gas density relay can be known, and the comparison and analysis can be further carried out.

When the density of the self-checking gas density relay monitors that the gas pressure has a rising trend on line, an abnormal notice should be put forward in time.

The self-checking gas density relay can check the temperature sensor according to the temperature value of the atmospheric environment.

The self-checking gas density relay can also carry out internal temperature on-line monitoring on the electrical equipment. The gas density relay also comprises a camera for monitoring the gas density relay.

The self-checking gas density relay also comprises an analysis system (expert management analysis system) for detecting and analyzing the gas density monitoring, the gas density relay and the monitoring element, and judging to know where the problem point is. Whether it is an electrical device or a gas density relay has a problem itself.

The self-checking gas density relay also monitors the contact signal state of the gas density relay and remotely transmits the state of the contact signal state. The contact signal state of the gas density relay can be known in the background: the open or closed state is realized, so that one more layer of monitoring is realized, and the reliability is improved.

The self-checking gas density relay can also detect the temperature compensation performance of the gas density relay, or detect and judge.

The self-checking gas density relay can also detect, or detect and judge, contact resistance of the contact of the gas density relay. Increase contact resistance measurement circuit on gas density relay, it is specific: 1. measuring by adopting a bridge method; 2. a voltage and current method is adopted, namely, Rjc ═ Uj/Ij.

The self-checking gas density relay also detects the temperature compensation performance, the contact resistance and the insulation performance of the gas density relay, or detects and judges. Increase insulation resistance measurement circuit on gas density relay, specifically: a voltage and current method is adopted, namely Rjy ═ Uy/Iy.

The self-checking gas density relay also monitors the contact signal state of the gas density relay.

The self-checking gas density relay also monitors the state of a control loop of a contact signal of the gas density relay. Such as monitoring for broken wires, short circuits.

The self-checking gas density relay can also perform online gas supply control. Or, the gas density relay can also carry out online gas drying control.

The self-checking gas density relay has protection on the environmental temperature of electronic components, prevents working at too low temperature or too high temperature and enables the relay to work within an allowable temperature range. A heater and/or a radiator (fan) can be arranged, the heater is started at low temperature, and the radiator (fan) is started at high temperature, so that the pressure sensor and/or the integrated circuit and other electronic components can reliably work in low-temperature or high-temperature environments.

The self-checking gas density relay has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

The method for verifying the gas density relay with online verification comprises the following steps:

during normal work, the gas density in the gas density relay monitoring equipment, and the gas density value in the gas density relay on-line monitoring equipment is controlled through the pressure sensor, the temperature sensor and the intelligent control unit.

1) adjusting the pressure adjustable mechanism to a verified initial state through the intelligent control unit;

2) closing the valve through an intelligent control unit;

3) and adjusting the online check contact signal sampling unit to a check state through the intelligent control unit. When the state is verified, the density relay contact point signal control loop is cut off, and the density relay contact point signal is connected to the intelligent control unit.

4) Through intelligence accuse unit drive pressure adjustable mechanism, make gas pressure slowly descend for gas density relay takes place the contact action, and the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, and the intelligence is controlled the unit and is obtained the density value according to pressure value, temperature value when the contact action, or directly obtains the density value, detects out gas density relay's contact signal (report to the police or shutting the contact) action value, accomplishes the check-up work of gas density relay's contact signal action value.

5) Control the adjustable mechanism of unit drive pressure through the intelligence, make gas pressure slowly rise for gas density relay takes place the contact and resets, and the contact signal resets and transmits the intelligence through online check-up contact signal sampling unit and controls the unit, and the intelligence is controlled the pressure value when the unit resets according to the contact, the temperature value obtains the density value, or directly obtains the density value, detects out gas density relay's contact signal (warning or shutting the contact) return value, accomplishes the check-up work of gas density relay's contact signal return value.

6) And after all the contact signal verification work is finished, the valve is opened through the intelligent control unit. And the online check contact signal sampling unit is adjusted to be in a working state through the intelligent control unit. And in the working state, the gas density relay contact signal control loop returns to the normal operation state. After the on-line calibration of the gas density relay is completed, the gas density relay automatically restores to the working state, the valve 4 is opened at the moment, the on-line calibration contact signal sampling unit is adjusted to the working state, and the gas density relay contact signal control loop restores to the normal working state. The gas density relay can automatically compare and judge the checking and detecting result. After the gas density relay completes the checking work of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end in various modes or can be sent to a designated receiver, for example, a mobile phone. After the verification work of the gas density relay is finished, if abnormity occurs, the intelligent control unit can upload an alarm contact signal of the density relay. The density value and the verification result are displayed on site or on the background, and the specific mode can be flexible. The control of the intelligent control unit can be completed through field control, background control or mutual interaction of the field control and the background control. The gas density relay can monitor the gas density value, the pressure value and the temperature value of the electrical equipment on line, and the gas density of the electrical equipment is monitored on line.

Example 17

A monitoring system of gas density relay composition with on-line self-calibration, comprising: a plurality of gas density relays with online check of a plurality of high-voltage electrical equipment provided with sulfur hexafluoride gas chambers are connected with a remote background detection system through a concentrator and a protocol converter in sequence; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. Or, comprising: a plurality of gas density relays with online check of a plurality of high-voltage electrical equipment provided with sulfur hexafluoride gas chambers are connected with a remote background detection system through a concentrator and an IEC61850 protocol converter in sequence; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chambers. The hub adopts an RS485 hub, and the IEC61850 protocol converter is also respectively connected with the network service printer and the network data router. The communication modes of the gas density relays with online verification are wired or wireless. Wired communication modes comprise industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carriers and the like; the wireless communication mode is that the sensor embeds 5G/NB-IOT communication module (for example 5G, NB-IOT), 2G/3G/4G/5G etc. WIFI, bluetooth, Lora, loraan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar etc. upload various sensor data to thing networking cloud platform. The self-checking gas density relay has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like. The system has the functions of data analysis and data processing, can perform corresponding fault diagnosis and prediction on the electrical equipment, and provides technical support for the state maintenance of the electrical equipment.

In the present invention, pressure (value) acquisition: the pressure value collection of the self-checking gas density relay is provided by a pressure sensor or a pressure transmitter integrating the pressure sensor and a processing circuit. The pressure sensor directly converts the physical pressure signal into a primary electric signal, and the primary electric signal is provided for a post-stage processing acquisition circuit for use. The pressure transmitter converts the physical pressure signal into a standard electrical signal, such as a current signal of 4-20mA and a voltage signal of 0-5V; or in some form of communication protocol, such as 485MODBUS communication, 232 communication. Pressure sensor types include, but are not limited to: diffused silicon pressure sensors, strain resistance pressure sensors, electrostatic capacitance pressure sensors, piezoelectric pressure sensors, sapphire pressure sensors, ceramic pressure sensors. Pressure acquisition this portion includes, but is not limited to, the following: the pressure sensor, signal conditioning element, operation controller, communication element, signal conversion component. The portion of the pressure may be achieved by: the primary electric signal of the pressure sensor is directly provided, the physical pressure signal is converted into a standard voltage or current signal to be provided in a transmitter mode, and the physical pressure signal is converted into a communication protocol to be provided in a transmitter mode.

In the present invention, temperature (value) acquisition: type of temperature sensor: thermal resistance, thermocouple, integrated component, semiconductor device. The temperature sensor includes but is not limited to the following components: the temperature sensing element, the signal conditioning element, the arithmetic controller, the communication element or the signal conversion element. The temperature sensor may be implemented by providing a process gas density control relay with: the temperature sensing element directly provides the primary electric signal, and the temperature sensing element directly provides the primary electric signal through voltage, current and a communication protocol.

The invention relates to an online checking contact signal sampling unit: including but not limited to the following components: the device comprises an isolation power supply, an optical coupler, a protection device, a voltage limiting device, a current limiting device and a filtering device. The sampling unit may also be implemented in other ways: transistor element, MOS pipe element, relay (electromagnetic relay, solid-state relay, switch), integrated IO chip. The sampling unit is provided in a mode of independently collecting the transmission module. And the intelligent control unit can be integrated on the intelligent control unit or the gas density relay. Or, the on-line check contact signal sampling unit is composed of wires in the simplest way.

The intelligent control unit of the invention: as a core of operation control of the whole gas density relay of the online checking gas density relay, the online checking gas density relay collects contact signals of an external sensor (pressure, temperature or density) and a density relay of a sampling unit, receives input information of a human-computer interface, outputs checking detection results in modes of uploading of the human-computer interface display screen, a printer, an external memory, a communication interface and the like through operation, and realizes online monitoring of physical quantities such as gas density and the like. The intelligent control unit includes but is not limited to the following components: the system comprises a power supply, a processor, a memory, an I/O port and a communication interface driving chip. The processor, memory, and I/O ports may be integrated into a single cpu chip. Other implementations are also possible, including: a microcomputer, a PLC, etc. The human-computer interface comprises: including but not limited to: display screen, button. The display screen can also be composed of a display screen and a touch screen. Or, it is also possible to realize by: serial port screen, HMI screen, microcomputer.

The pressure adjustable mechanism 5 of the invention: the pressure adjustable mechanism 5 is further provided with a control system, and the intelligent control unit 7 and the control system are combined to control the driving part 52 (which can be realized by mainly adopting a motor and a gear and has various and flexible modes) of the pressure adjustable mechanism 5 to move so as to complete the lifting of the pressure.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas density relay with online verification, comprising: a shell, a base, a pressure detector, a temperature compensation element, a plurality of signal generators and an equipment connecting joint which are arranged in the shell, and is characterized in that,

2. The gas density relay with online verification according to claim 1, further comprising an online verification contact signal sampling unit, wherein the online verification contact signal sampling unit is respectively connected with the signal generator and the intelligent control unit.

3. The gas density relay with online verification function as claimed in claim 1, wherein the intelligent control unit is used for controlling the valve, controlling the pressure adjustable mechanism, collecting pressure and temperature; or the intelligent control unit is used for completing density value acquisition.

4. The gas density relay with online verification according to claim 1 or 2, wherein the online verification contact signal sampling unit verifies that the gas density relay contact meets the following requirements: the contact signal sampling unit is provided with a plurality of independent groups of sampling contacts, and can automatically complete verification on a plurality of pairs of contacts at the same time; and the action values of multiple pairs of contacts can be continuously measured without replacing or reselecting the contacts.

5. A gas density relay with on-line verification according to claim 1, wherein said density relay further comprises a movement, a pointer, a dial, with a display of value; or/and digital or liquid crystal devices with a display.

6. The gas density relay with the online verification function according to claim 1 or 5, wherein the gas density relay can measure the contact value and/or the rated pressure value of the gas density relay at the working environment temperature, and automatically convert the contact value and/or the rated pressure value into the corresponding pressure value at 20 ℃, so that the performance detection of the contact value and/or the rated pressure value of the gas density relay is realized online, and the online verification work of the gas density relay is completed.

7. The gas density relay with the online verification function is characterized in that the gas density relay can measure the contact value and/or the rated pressure value of the gas density relay at the working environment temperature, automatically convert the contact value and/or the rated pressure value into the corresponding pressure value at 20 ℃, and realize the performance detection of the contact value and/or the rated pressure value of the gas density relay online; and the gas density value, the pressure value and the temperature value of the electrical equipment can be monitored on line, so that the gas density of the electrical equipment can be monitored on line.

8. The gas density relay with the online verification function is characterized in that the valve is closed through the intelligent control unit, so that the gas density relay is isolated from the electrical equipment on a gas path; the gas pressure is adjusted to rise and fall through the pressure adjustable mechanism, so that the density relay generates contact signal actions, the contact signal actions are transmitted to the intelligent control unit through the online check contact signal sampling unit, the intelligent control unit detects contact signal action values and/or return values of the gas density relay according to density values when the contact signals act, and the check work of the gas density relay is completed online.

9. The gas density relay with on-line verification function as claimed in claim 3, wherein the intelligent control unit collects a pressure sensor and a temperature sensor, and converts the pressure value and the temperature value into a pressure value of 20 ℃ according to the gas characteristics.

10. The gas density relay with on-line verification function as claimed in claim 1, wherein the intelligent control unit can measure and automatically and accurately test absolute pressure type gas density relay and relative pressure type gas density relay, and comprises absolute pressure structure-absolute pressure display type density relay, absolute pressure structure-gauge pressure display type density relay, gauge pressure structure-absolute pressure display type density relay and gauge pressure structure-gauge pressure display type density relay.

11. The gas density relay with online verification according to claim 10, wherein the gas density relay has a man-machine interaction function: the data display interface is provided, and the current data value can be refreshed in real time; the device has a data input function and can input parameter set values.

12. The gas density relay with online verification as claimed in claim 10 or 11, wherein the intelligent control unit of the gas density relay is provided with an interface capable of storing test data; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input.

13. The gas density relay with on-line verification as claimed in claim 12, wherein the intelligent control unit further comprises a communication module, and the communication module is used for transmitting the test data and/or verification result information remotely.

14. The gas density relay with on-line verification function as claimed in claim 13, wherein the communication mode of the communication module is a wired communication mode or a wireless communication mode, wherein the wired communication mode includes an industrial bus, an optical fiber ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier, and a cable; the wireless communication modes comprise NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.

15. The gas density relay with on-line verification function as claimed in claim 1, wherein the valve is an electric valve, an electromagnetic valve, a permanent magnetic electromagnetic valve, a piezoelectric valve, a temperature controlled valve, a valve which is closed or opened by bending or flattening a hose, or a valve which is made of an intelligent memory material and is opened or closed by electric heating.

16. A gas density relay with in-line verification according to claim 15, wherein the valve is sealed within a chamber or housing.

17. A gas density relay with on-line verification according to claim 1 or 16, wherein in the valve closed state the pressure adjustable mechanism is able to slowly increase or decrease the load when increasing or decreasing the pressure. When measuring the action value of the contact signal of the gas density relay, the load change speed is not more than 15 per second of the measuring range when approaching the action value.

18. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a closed gas chamber, a heating element is arranged outside or inside the closed gas chamber, and the temperature change of the gas in the closed gas chamber is conducted by heating the heating element, so as to complete the rise and fall of the gas pressure.

19. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a closed gas chamber, a refrigeration element is arranged outside or inside the closed gas chamber, and the change of the temperature of the gas in the closed gas chamber is guided by the refrigeration element, so as to complete the rise and fall of the gas pressure.

20. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a closed gas chamber, heating and cooling elements are arranged outside or inside the closed gas chamber, and the temperature change of the gas in the closed gas chamber is conducted through the heating and cooling elements, so as to complete the pressure rise and fall.

21. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a sealed air chamber, a semiconductor is arranged outside or inside the sealed air chamber, and the temperature change of the gas in the sealed air chamber is conducted through heating or cooling of the semiconductor, so as to complete the pressure rise and fall.

22. A gas density relay with on-line verification according to claim 18 or 19 or 20 or 21, wherein said pressure adjustable mechanism is provided with a thermal insulation member, said thermal insulation member being disposed outside said closed gas chamber.

23. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a piston adjusting mechanism, and the pressure is adjusted by a piston adjusting member through magnetic force or a motor to complete the pressure rise and fall; or the piston adjusting piece is adjusted through the reciprocating mechanism to finish the lifting of the pressure; or the piston adjusting piece is adjusted through the Carnot cycle mechanism to finish the lifting of the pressure; or the pneumatic element is used for adjusting the piston adjusting piece to finish the lifting of the pressure.

24. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is an air bag, and the pressure is adjusted by a magnetic force or a motor, or a reciprocating mechanism, or a carnot cycle mechanism, or a pneumatic element to complete the pressure rise and fall.

25. The gas density relay with on-line verification function as claimed in claim 17, wherein the pressure adjustable mechanism is a bellows, and the pressure is adjusted to rise or fall by a magnetic force or a motor or a reciprocating mechanism or a carnot cycle mechanism or a pneumatic element.

26. The gas density relay with on-line verification as claimed in claim 17, wherein the pressure adjustable mechanism is a release valve, the release valve is sealed in a gas chamber or connected with a gas chamber, and the pressure is raised or lowered through the release valve.

27. The gas density relay with on-line verification as claimed in claim 26, wherein the pressure adjustable mechanism further comprises a flow valve, and the pressure rise and fall are accomplished by the flow valve and a gas release valve.

28. The gas density relay with on-line verification as claimed in claim 26 or 27, wherein the purge valve is a solenoid valve, or an electric valve, or other purge valves implemented by electric or gas.

29. The gas density relay with on-line verification as claimed in claim 17, wherein the pressure adjustable mechanism is a compressor, and the pressure is increased or decreased by the compressor.

30. The gas density relay with online verification of claim 17, wherein the pressure adjustable mechanism is a pump, and the pressure is increased or decreased by the pump.

31. The gas density relay with on-line verification as claimed in claim 30, wherein the pump is an air pump, and the pressure is increased or decreased by the air pump.

32. The gas density relay with on-line verification as claimed in claim 30, wherein the pump is a pressurizing pump, or a booster pump, or an electric air pump, or an electromagnetic air pump.

33. A gas density relay with in-line verification according to claim 17, wherein said pressure adjustable mechanism is sealed within a chamber or housing.

34. A gas density relay with in-line verification according to claim 17, wherein the valve and the pressure adjustable mechanism are sealed within a chamber or housing.

35. The gas density relay with online verification as claimed in claim 1, wherein the pressure sensor, the temperature sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.

36. A gas density relay with on-line verification according to claim 35, wherein the temperature sensor is arranged on or in the housing of the gas density relay, outside the housing.

37. A gas density relay with in-line verification according to claim 35, wherein said temperature sensor is placed in proximity to a temperature compensation element of the gas density relay.

38. The gas density relay with on-line verification as claimed in claim 35, wherein the on-line verification contact signal sampling unit and the intelligent control unit are arranged together.

39. The gas density relay with on-line verification of claim 35, wherein the pressure sensor and the temperature sensor are of an integrated structure; or the integrated structure formed by the pressure sensor and the temperature sensor also has a remote transmission function, and can directly remotely transmit density, pressure and temperature signals and the contact signal state of the remote transmission gas density relay.

40. The gas density relay with on-line verification of claim 35, wherein the pressure and temperature sensors are of a unitary construction; or the pressure and temperature sensor is an integrated gas density transmitter, and the gas density transmitter directly transmits density, pressure and temperature signals and monitors and transmits the contact signal state of the gas density relay.

41. The gas density relay with on-line verification function according to claim 40, wherein the on-line verification contact signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

42. The gas density relay with on-line verification as claimed in claim 1, wherein the gas density relay has a remote transmission function.

43. A gas density relay with on-line verification according to claim 1 or 42, wherein the on-line verification contact signal sampling unit is relatively isolated from the gas density relay contact signal in circuit when in a non-verification state. When the density relay is in a checking state, a contact signal control loop of the density relay can be cut off, and the contact action signal of the gas density relay is not uploaded during checking, so that the safe operation of a power grid is not influenced.

44. The gas density relay with on-line verification as claimed in claim 43, wherein the on-line verification contact signal sampling unit and the gas density relay contact signal are isolated from each other by photoelectric isolation, so as to ensure the safety of the intelligent control unit during verification.

45. A gas density relay with on-line verification according to claim 43, wherein said on-line verification contact signal sampling unit has a protection circuit to prevent the intelligent control unit from being affected during verification.

46. The gas density relay with on-line verification function as claimed in claim 1, further comprising a clock, wherein the clock is arranged on the intelligent control unit, and the time for verifying the density relay can be periodically set or the test time can be recorded.

47. The gas density relay with on-line verification according to claim 1, further comprising a power supply circuit and a rechargeable battery.

48. The gas density relay with on-line verification according to claim 1, wherein the on-line verification contact signal sampling unit has a test voltage of not lower than 24V for the contact signal action value or the switching value of the density relay.

49. The gas density relay with online verification according to claim 1, wherein the gas density relay is provided with a rated pressure value output signal, and the rated pressure value output signal is connected with the intelligent control unit.

50. The gas density relay with on-line verification function as claimed in claim 49, wherein when the rated pressure value of the gas density relay outputs a signal, the intelligent control unit simultaneously collects the current density value, and completes the verification of the rated pressure value of the gas density relay. The gas density relay can automatically carry out comparison and judgment, and if the error exceeds the set value, an abnormal prompt is sent out.

51. The gas density relay with on-line verification function as claimed in claim 49, wherein the intelligent control unit can complete the mutual verification of the mechanical part, the pressure sensor and the temperature sensor of the gas density relay, when the gas density relay completes the on-line verification of the gas density relay, the mutual comparison and judgment can be automatically performed, and if the error exceeds the set value, an abnormal prompt can be sent.

52. A gas density relay with on-line verification according to claim 51, wherein the gas density relay comprises a plurality of pressure sensors and temperature sensors, the mutual verification of the test data of the plurality of pressure sensors and temperature sensors, and the mutual verification of the test data of the plurality of pressure sensors, temperature sensors and gas density relay, ensures that the gas density relay is working properly.

53. The gas density relay with on-line verification function as claimed in claim 1 or 41, wherein the pressure adjustable mechanism adjusts the gas pressure to zero, the intelligent control unit collects the pressure value at the time, the gas density relay automatically performs the pressure zero verification and judges, and if the error exceeds the set value, an abnormal prompt is given.

54. The gas density relay with on-line verification as claimed in claim 1, wherein the intelligent control unit can perform the verification of the temperature sensor.

55. A gas density relay with on-line verification function according to claim 50, 51 or 52, wherein said intelligent control unit is capable of automatically generating a verification report of the density relay after completing the verification of the gas density relay, and automatically giving an alarm if the density relay is abnormal, or sending the verification report to a designated receiver.

56. A gas density relay with on-line verification function according to claim 50, 51 or 52, wherein after the intelligent control unit completes the verification operation of the gas density relay, if abnormal, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.

57. The gas density relay with the on-line verification function as claimed in claim 50, 51 or 52, wherein after the intelligent control unit completes the verification of the gas density relay, if there is an abnormality, the intelligent control unit uploads an alarm contact signal of the density relay, and the alarm contact signal is processed by a receiver after uploading, so that the verification condition of the gas density relay can be conveniently known.

58. The gas density relay with online verification of claim 57, wherein the density value and the verification result are displayed on site in the field or on the background.

59. The gas density relay with on-line verification function as claimed in claim 1, wherein the control of the intelligent control unit is achieved through field control, background control or mutual interaction of the field control and the background control.

60. The gas density relay with online verification as claimed in claim 1, wherein the intelligent control unit comprises: the system comprises a microprocessor, a human-computer interface, a valve controller and a pressure-adjustable mechanism position detection and execution controller, wherein the human-computer interface, the valve controller and the pressure-adjustable mechanism position detection and execution controller are all electrically connected with the microprocessor.

61. The gas density relay with online verification according to claim 1, further comprising a micro water sensor capable of monitoring a gas micro water value online.

62. The gas density relay with online verification according to claim 1, further comprising a micro water sensor and a gas circulation mechanism, wherein the micro water value in the gas can be monitored online.

63. A gas density relay according to claim 61, wherein the gas circulation mechanism comprises a capillary tube, a sealed chamber and a heating element, and the gas circulation mechanism is used for realizing gas flow by heating the heating element, so that the micro water value in the gas can be monitored online.

64. The gas density relay with online verification according to claim 1, further comprising a decomposition product sensor capable of online monitoring of gas decomposition products.

65. The gas density relay with on-line verification of claim 11, wherein the gas density relay has a safety protection function, and when the density value or the pressure value is lower than a set value, the density relay is automatically not verified any more and a notification signal is sent out.

66. A gas density relay with on-line verification according to claim 65, wherein the gas density relay makes comparisons of its error performance at different temperatures and for different time periods depending on the density relay.

67. A gas density relay with on-line verification according to claim 1, wherein the gas density relay is repeatedly verified and its average value is calculated.

68. The gas density relay with online verification function according to claim 1, wherein the verification result of the intelligent control unit on the density relay can be uploaded in various ways, such as uploading via online density remote transmission or uploading via 5G wireless communication.

69. The gas density relay with the online verification function as claimed in claim 50, 51 or 52, wherein the determination of normality and abnormality of the gas density relay and the density value of the monitored electrical equipment is carried out, and the determination, the comparison and the analysis of normality and abnormality of the density value of the electrical equipment, the pressure detector of the gas density relay, the temperature compensation element, the pressure sensor and the temperature sensor are carried out, so that the gas density monitoring of the electrical equipment, and the determination, the comparison and the analysis of the state of the gas density relay are realized.

70. The gas density relay with the online verification function as claimed in claim 1, wherein pressure sensors are respectively arranged on two sides of a gas path of the valve; during calibration, when the valve is closed, one pressure sensor monitors the pressure value of the electrical equipment, so that the density value of the electrical equipment is monitored constantly, and the safety of the calibration process is ensured; the other pressure sensor self-checks the pressure value of the gas density relay.

71. The gas density relay with on-line verification as claimed in claim 1, wherein the density relay or density switch is installed at the front end of the valve to output a signal of safe verification set point, which is connected to the intelligent control unit to monitor the density value of the electrical equipment itself at any time to ensure the verification process is safe.

72. The gas density relay with on-line verification function as claimed in claim 71, wherein when the density of the gas density relay detects that the gas pressure is abnormal on line, the on-line verification of the gas density relay is started, so that the performance of the gas density relay is known and compared and analyzed.

73. The gas density relay with on-line verification function as claimed in claim 72, wherein the density of the gas density relay provides an abnormal notification in time when the gas pressure is monitored to be increased on line.

74. A gas density relay with on-line verification according to claim 72 or 73, wherein the gas density relay is also capable of on-line monitoring of the internal temperature of the electrical equipment.

75. The gas density relay with online verification according to claim 1, further comprising a camera that monitors the gas density relay itself.

76. The gas density relay with online verification function as claimed in claim 1, further comprising an analysis system, wherein the analysis system is used for detecting, analyzing and judging the gas density monitoring, the performance of the gas density relay and the monitoring element.

77. The gas density relay with on-line verification function as claimed in claim 8, wherein the gas density relay can monitor the contact signal state of the gas density relay and remotely transmit the state.

78. The gas density relay with online verification function according to claim 4, wherein the gas density relay is further capable of detecting, or detecting and determining, the temperature compensation performance of the gas density relay.

79. The gas density relay with online verification function according to claim 4, wherein the gas density relay is further capable of detecting, or detecting and determining contact resistance of the contact of the gas density relay.

80. The gas density relay with online verification function according to claim 4, wherein the gas density relay can also detect or detect and determine the temperature compensation performance, contact point contact resistance and insulation performance of the gas density relay.

81. A gas density relay with on-line verification according to claim 78 wherein the gas density relay also monitors the control loop status of the contact signal of the gas density relay.

82. A gas density relay with on-line verification according to claim 77 or 81, wherein the gas density relay is on-line air supplement.

83. A gas density relay with on-line verification according to claim 82, wherein the gas density relay is on-line gas dry enabled.

84. The gas density relay with on-line verification function as claimed in claim 1, wherein the gas density relay includes protection for the ambient temperature of the electronic components to prevent operation at too low or too high a temperature to allow operation within a permissible temperature range.

85. The gas density relay with the online verification function is characterized in that the gas density relay has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on the electrical equipment and the density relay.

86. The gas density relay with on-line verification according to claim 1, wherein the pressure detector is a bourdon tube or a bellows; the temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the signal generators are microswitches or magnetic auxiliary electric contacts.

87. A method for checking a gas density relay with on-line checking is characterized in that,

the gas density relay is based on the set checking time or instruction and the gas density value condition, under the condition of allowing to check the gas density relay:

1) closing the valve through an intelligent control unit;

3) the pressure adjustable mechanism is driven by the intelligent control unit, so that the gas pressure is slowly reduced, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a density value according to a pressure value and a temperature value when the contact acts or directly obtains the density value, a contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;

4) the pressure adjustable mechanism is driven by the intelligent control unit, so that the gas pressure slowly rises, the contact point resetting of the gas density relay is realized, the contact point signal resetting is transmitted to the intelligent control unit through the online checking contact point signal sampling unit, the intelligent control unit obtains a density value according to a pressure value and a temperature value when the contact point is reset or directly obtains the density value, a contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed;

5) after all contact signal check-up work were accomplished, open the valve through the intelligence unit of controlling, control the unit through the intelligence and adjust online check-up contact signal sampling unit to operating condition, when operating condition, gas density relay contact signal control circuit resumes the normal operating condition.

88. The method for verifying the gas density relay with the on-line verification function as claimed in claim 87, wherein the gas density relay automatically compares and judges the verification detection result.

89. A method for verifying a gas density relay according to claim 87, wherein after the gas density relay completes the verification of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end in various modes or sent to a designated receiver.

90. The method as claimed in claim 87, wherein the intelligent control unit uploads the alarm contact signal of the density relay if the verification of the gas density relay is abnormal.

91. The method of claim 87, wherein the density value and the verification result are displayed on-site in the field or on the background.

92. The method for verifying the gas density relay as claimed in claim 87, wherein the intelligent control unit is controlled by field control, background control, or both.

93. The method of claim 87, wherein the gas density relay is capable of monitoring the gas density, pressure and temperature of the electrical equipment on-line, so as to monitor the gas density of the electrical equipment on-line.

94. A monitoring system of a gas density relay with on-line self-checking is characterized by comprising a plurality of high-voltage electrical equipment with gas chambers and a plurality of gas density relays with on-line checking, wherein the gas density relays with on-line checking are connected with a remote background detection system sequentially through a concentrator and a protocol converter; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding insulating gas chamber.

95. The monitoring system with the on-line self-checking gas density relay as claimed in claim 94, comprising a plurality of high-voltage electrical devices provided with gas chambers, a plurality of gas density relays with on-line checking, wherein the plurality of gas density relays with on-line checking are all connected with the remote background detection system through a concentrator and an IEC61850 protocol converter in sequence; the gas density relays with online verification are respectively arranged on the high-voltage electrical equipment of the corresponding insulating gas chamber.

96. The monitoring system consisting of an on-line self-checking gas density relay as claimed in claim 94, wherein the hub is an RS485 hub, and the IEC61850 protocol converter is further connected to the network service printer and the network data router, respectively.

97. The monitoring system consisting of the gas density relays with the online self-check function as claimed in claim 94 or 96, wherein a plurality of the gas density relays with the online self-check function upload various sensor data to an internet of things cloud platform in a wired or wireless communication manner; the wired communication mode comprises an industrial bus, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable and a PLC power carrier; the wireless communication modes comprise a 5G/NB-IOT communication module arranged in the sensor, a 2G/3G/4G/5G, WIFI mode, a Bluetooth mode, a Lora mode, a Lorawan mode, a Zigbee mode, an infrared mode, an ultrasonic mode, a sound wave mode, a satellite mode, a light wave mode, a quantum communication mode and a sonar mode.