CN110568352A

CN110568352A - Intelligent detection device, method and monitoring system for density relay without maintenance

Info

Publication number: CN110568352A
Application number: CN201910830737.9A
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: 2019-12-13

Abstract

The invention discloses a density relay maintenance-free intelligent detection device, a method and a monitoring system, wherein the detection device is connected with electrical equipment and a gas density relay together, the electrical equipment is communicated with one end of a valve, and the gas density relay is communicated with the other end of the valve; density relay non-maintaining intelligent detection device includes: the device comprises a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit; the pressure adjusting mechanism is communicated with the gas density relay; the online check contact signal sampling unit is respectively connected with the density relay and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the 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

Intelligent detection device, method and monitoring system for density relay without maintenance

Technical Field

The invention belongs to the technical field of gas density relays, and particularly relates to a maintenance-free intelligent detection device, method and system for a density relay.

Background

At present, SF₆(sulfur hexafluoride) electrical equipment is widely applied to the power sector and industrial and mining enterprises, and rapid development of the power industry is promoted. 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, so that the pressure of the gas chamber is increased. 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. Whereas current gas density monitoring systems (gas density relays) are 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) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. SF₆The gas density relay is the core and key component. However, due to the severe environment of the field operation of the high-voltage transformer substation, especially the strong electromagnetic interference, the gas density monitoring used at presentIn systems (gas density relays), their telemetric SF₆The 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 a 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, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. The power supply company, the power plant and the large-scale factory and mining enterprise need to be equipped with testers, equipment vehicles and high-value SF for completing the field check and detection work of the gas density relay₆A gas. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. 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 maintenance-free intelligent detection device, method and monitoring system for a density relay becomes a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a maintenance-free intelligent detection device, method and monitoring system for a density relay, 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 the safe operation of a power grid.

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

A density relay maintenance-free intelligent detection device is connected with an electrical device and a gas density relay, wherein the electrical device is communicated with one end of a valve, and the gas density relay is communicated with the other end of the valve; its characterized in that, density relay non-maintaining's intelligent detection device includes: the device comprises a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit; the pressure adjusting mechanism is communicated with the gas density relay; the online check contact signal sampling unit is respectively connected with the density relay and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the intelligent control unit.

preferably, the detection device comprises the valve, one end of the valve is communicated with the electrical equipment, and the other end of the valve is communicated with the pressure adjusting mechanism and/or the gas density relay.

Preferably, the detection device further comprises a gas density detection sensor, and the gas density detection sensor is communicated with the pressure adjusting mechanism and/or the gas density relay on the gas path.

Preferably, the gas density detection sensor adopts a pressure sensor and a temperature sensor; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or a density detection sensor using quartz tuning fork technology.

Preferably, the intelligent control unit controls the valve, controls the pressure adjusting mechanism, collects the pressure and collects the temperature; or completing control of the valve, control of the pressure adjusting mechanism and density value acquisition.

Preferably, the online check contact signal sampling unit is mainly used for sampling contact signals of the gas density relay.

Preferably, 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 through the pressure adjusting mechanism to rise and fall, 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.

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, can automatically complete verification on a plurality of pairs of contacts (such as alarm, first locking, second locking or alarm, locking and overpressure) at the same time, and continuously measures action values of the plurality of pairs of contacts by alarm, first locking, second locking or overpressure and the like 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 device mainly functions to measure the contact value (pressure value during alarm/locking action) 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 ℃, realize the performance detection of the contact value (alarm and locking) and/or the rated pressure value of the gas density relay on line, and complete the on-line verification work of the gas density relay.

Preferably, the device mainly functions 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, automatically convert the contact value into corresponding pressure value at 20 ℃, and 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.

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 detection device converts the measured pressure value and temperature value into a pressure value corresponding to 20 ℃ according to the gas characteristics, that is, the detection device has 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, detection device can automatic accurate test absolute pressure type gas density relay and relative pressure type gas density relay, including the density relay of structure-absolute pressure demonstration type, the density relay of structure-gauge pressure demonstration type, gauge pressure structure-absolute pressure demonstration type density relay, gauge pressure structure-gauge pressure demonstration type density relay. The method comprises the following steps: the device is provided with an absolute pressure sensor and a relative pressure sensor.

Preferably, the detection device has a human-computer interaction function: the data display interface is arranged, 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 detection device is provided with an interface.

Preferably, the intelligent control unit of the device has an interface: test data storage can be completed; and/or test data derivation; and/or the test data may be printed; and/or carrying out data communication with an upper computer; and/or inputting analog quantity and digital quantity information.

Preferably, 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.

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 in a long distance 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 detection device further comprises a multi-way joint, and the pressure adjusting mechanism is arranged on the multi-way joint.

Preferably, the detection device further comprises a multi-way joint and a self-sealing valve, and the pressure adjusting mechanism and the self-sealing valve are installed on the multi-way joint.

Preferably, the detection device directly comprises a gas density relay or a density switch.

Preferably, the detection device directly contains a valve, one end of the valve is communicated with the electrical equipment, and the other end of the valve is communicated with a pressure adjusting mechanism or a multi-way joint of the device.

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

Preferably, the gas density relay, the valve and the pressure adjusting 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 adjustment mechanism is capable of slowly increasing or decreasing the load when raising or lowering the pressure of 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 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 adjusting 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 rise and fall of the gas pressure are completed.

Preferably, the pressure adjusting 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 by the refrigerating element, so that the lifting of the gas pressure is completed.

Preferably, the pressure adjusting 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.

Preferably, the pressure adjusting 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 guided by heating or cooling the semiconductor, so that the pressure is increased or decreased.

Preferably, the pressure adjusting mechanism is further provided with a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber, so that the temperature change effect can be improved.

preferably, the pressure adjusting 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 lifting of the pressure.

Preferably, the pressure adjusting mechanism is an air bag, and the air bag is adjusted through magnetic force, a motor (variable frequency motor), a reciprocating mechanism, a Carnot cycle mechanism or a pneumatic element to finish the lifting of the pressure.

Preferably, the pressure adjusting mechanism is a corrugated pipe, and the pressure is adjusted to rise and fall through the expansion and contraction of the corrugated pipe by a magnetic force or a motor (a variable frequency motor), a reciprocating mechanism, a Carnot cycle mechanism or a pneumatic element.

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

Preferably, the pressure adjusting mechanism further comprises a flow valve, and the pressure is increased or decreased through the flow valve and the air release valve.

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

Preferably, the pressure adjusting mechanism is a compressor, and the pressure is lifted by the compressor.

Preferably, the pressure adjusting mechanism is a pump, and the pressure is increased or decreased by 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, an electric air pump or an electromagnetic air pump.

Preferably, the pressure adjustment mechanism is sealed within a chamber or housing.

preferably, the valve and pressure adjustment mechanism are sealed within a chamber or housing.

Preferably, pressure sensor, temperature sensor, online check-up contact signal sampling unit, intelligent accuse unit set up on 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 arranged on the gas density relay; or the gas density relay, the pressure sensor and the temperature sensor are of an integrated structure, and the remote transmission type gas density relay directly remotely transmits density, pressure and temperature signals and the contact signal state of the remote transmission type gas density relay.

Preferably, the pressure sensor and the temperature sensor are of an integrated structure; or the pressure and temperature sensor is a gas density transmitter with an integrated structure, 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, when the gas density relay to be verified is a remote transmission type density relay, a pressure sensor and a temperature sensor can be omitted.

Preferably, 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 the contact signal of the gas density relay 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.

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

Preferably, online check-up contact signal sampling unit has 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 system further comprises a clock, wherein the clock is arranged on the intelligent control unit and can be used for regularly setting the time for checking the density relay or recording the test time.

Preferably, the device also comprises a power supply circuit and a rechargeable battery. Or various suitable power sources such as solar, lithium batteries, etc.

Preferably, the checking of the density relay can be periodically completed according to the setting or the instruction of the background, that is, the time for online checking of the density relay is periodically set.

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, when the gas density relay has a rated pressure value output signal, the rated pressure value output signal is connected with the intelligent control unit.

Preferably, when the rated pressure value output signal of gas density relay, the intelligent control unit gathers density value at that time simultaneously, accomplishes the rated pressure value check-up of gas density relay. The device or the background can automatically perform comparison and judgment, and if the error difference is large, an abnormal prompt is sent out: gas density relays or pressure sensors, temperature sensors have problems. The device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter.

Preferably, the detection device can complete mutual verification of the gas density relay, the pressure sensor and the temperature sensor. When the device accomplishes the check-up of gas density relay, can carry out the judgement of contrasting each other automatically, if the error phase difference is big, will send unusual suggestion: gas density relays or pressure sensors, temperature sensors have problems. The device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter. The method has the capability of artificial intelligence proofreading.

Preferably, pressure sensor and temperature sensor are provided with a plurality ofly, the mutual check-up of a plurality of pressure sensor and temperature sensor's test data is accomplished to the intelligence accuse unit to and the mutual check-up of these a plurality of pressure sensor, temperature sensor and gas density relay's test data, ensure that device work is normal.

Preferably, after closing the valve, the zero bit is put to pressure sensor's gas pressure completely to the bleed valve, pressure adjustment mechanism adjusts gas pressure to the zero bit, and the unit is controlled to the intelligence gathers pressure sensor's pressure value at that time simultaneously, and the device can carry out pressure sensor's zero bit check automatically, and judges, if the error phase difference is big, will send unusual suggestion: pressure sensors have problems. Namely, the device can complete the zero calibration function of the pressure sensor.

Preferably, the detection device can complete the calibration of the temperature sensor. The method comprises the following steps: the device compares the transmitted environmental temperature value with the sampling value of the temperature sensor.

Preferably, after the verification work of the gas density relay is completed, the device can automatically generate a verification report of the density relay, and if the verification report is abnormal, the device can automatically send an alarm or send the verification report to a designated receiver, such as a mobile phone.

Preferably, after the verification work of the gas density relay is completed, if an abnormity occurs, an alarm can be automatically sent out and uploaded to a remote end, or the alarm can be sent to a designated receiver, for example, a mobile phone.

Preferably, accomplish gas density relay's check-up work back, if have unusually, the intelligence is controlled the unit and can be uploaded through density relay's warning contact signal line, uploads the back and handles through the receiver, conveniently knows gas density relay's check-up situation.

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

Preferably, the control of the intelligent control unit can be achieved through field control, background control or mutual interaction of the field control and the background control.

Preferably, the detection device has the functions of displaying data such as real-time online density values, pressure values and temperature values, or/and analyzing change trend, or/and inquiring historical data, or/and alarming in real time, and the like.

Preferably, the detection device 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 adjusting mechanism position detection and execution controller, wherein the human-computer interface, the valve controller and the pressure adjusting 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, 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, when the rated pressure value of the gas density relay or other pressure values needing to be verified have contact signal output, the detection device can verify the rated pressure value or other pressure values of the gas density relay.

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

Preferably, the detection device further comprises a micro water sensor, and the micro water sensor is connected with the gas density relay and can monitor the gas micro water value on line.

Preferably, the device also comprises a micro water sensor and a gas circulation mechanism, wherein the micro water sensor and the gas circulation mechanism are connected with the gas density relay, 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 on line.

Preferably, the detection device further comprises a decomposition product sensor, and the decomposition product sensor is connected with the gas density sensor and can monitor gas decomposition products on line.

preferably, the apparatus has a self-diagnostic function and can notify an abnormality in time. Such as a wire break, short alarm, sensor damage, etc.

Preferably, the detection device has a safety protection function, and when the gas density value of the electrical equipment is lower than a set value, the density relay is automatically not checked any more, and a corresponding notification signal is sent.

Preferably, when the environment temperature of high temperature, low temperature, normal temperature, 20 ℃ is checked, the error determination requirements of the detection device may be different, and may be specifically implemented according to the temperature requirements and the related standards.

Preferably, the detection device 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 density relay. The comparison of each period with history and the comparison of the history and the present are carried out. Meanwhile, the device can be subjected to physical examination.

Preferably, the device can repeatedly verify the density relay for multiple times (for example, 2 to 3 times), and calculate the average value of the density relay.

Preferably, the device can verify the density relay at any time when necessary.

Preferably, the check result of the density relay by the detection device can be uploaded in various ways. Uploading may be performed, for example, by density online remote transmission; or through wireless uploading; or uploaded by another route; the alarm can also be uploaded through an alarm contact signal wire; or uploading separately; or uploaded with other signal packages.

Preferably, the detection device has a gas density relay, and determines whether the density value of the monitored electrical equipment is normal. The density value of the electrical equipment, the gas density relay, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, the gas density monitoring device, the gas density relay and the like can be judged, compared and analyzed.

Preferably, the device 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 the check-up, when the valve was closed, the pressure value of a pressure sensor monitoring electrical equipment itself, and then the density value of monitoring electrical equipment itself constantly, it is safe to guarantee that the check-up process is, and the pressure value of another pressure sensor monitoring gas density relay.

Preferably, the detection device is provided with a density relay or a density switch at the front end of the valve, outputs a signal of a safety check set point, and the signal is connected with the intelligent control unit, so that the density value of the electrical equipment is monitored constantly, and the check process is ensured to be safe.

Preferably, when the detection device monitors that the gas density of the electrical equipment is abnormal on line, the detection device starts the calibration of the gas density relay, so that the performance of the gas density relay is known and compared and analyzed.

Preferably, when the gas pressure is monitored to have a rising trend on line, an abnormal notice is put forward in time.

Preferably, the device can verify the temperature sensor according to the temperature value of the atmospheric environment.

Preferably, the detection device can perform online internal temperature monitoring on the electrical equipment.

Preferably, the detection device further comprises a camera for monitoring the detection device or/and the gas density relay.

Preferably, the detection device further includes an analysis system (expert management analysis system) for detecting, analyzing and determining the gas density monitoring, the gas density relay and the monitoring element of the electrical equipment to know where the problem is. Whether it is a gas density relay, electrical equipment, or the device itself is problematic.

Preferably, the detection device also monitors the contact signal state of the gas density relay and remotely transmits the 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 detection device can also detect, or detect and determine, the temperature compensation performance of the gas density relay.

Preferably, the detection device is also capable of detecting, or detecting and determining, contact resistance of the contact of the gas density relay.

Preferably, the detection device also detects, or detects and determines, the temperature compensation performance, the contact point contact resistance, and the insulation performance of the gas density relay.

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

Preferably, the device further monitors the state of a control circuit of a contact signal of the gas density relay to determine disconnection or short circuit.

Preferably, the device can also carry out online air supplement control; or online monitoring of gas density values.

Preferably, the device can also perform online gas drying control.

Preferably, the detection device has protection to the environmental temperature of the electronic component, and prevents the electronic component from working at too low temperature or too high temperature, so that the electronic component works in 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 elements can reliably work in low-temperature or high-temperature environments.

Preferably, the detection device has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on the electrical equipment.

A density relay maintenance-free intelligent detection device is characterized in that the detection device is connected with electrical equipment, a remote transmission gas density relay and a valve, one end of the valve is communicated with the electrical equipment, and the other end of the valve is communicated with the remote transmission gas density relay; its characterized in that, density relay non-maintaining's intelligent detection device includes: the device comprises a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit; the pressure adjusting mechanism is communicated with the remote transmission gas density relay; the online check contact signal sampling unit is respectively connected with the remote transmission gas density relay and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the intelligent control unit.

A detection method of a density relay maintenance-free intelligent detection device,

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

The detection device is used for detecting the gas density relay according to a set verification time or/and a verification instruction and the gas density value condition under the condition of allowing the verification of the gas density relay:

1) Closing the valve through an intelligent control unit;

2) The online check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, a density relay contact signal control loop is cut off or isolated, and a density relay contact signal is connected to the intelligent control unit; the related operations can be specifically carried out according to the designed circuit requirements.

3) The pressure adjusting 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 (an alarm or a locking contact) 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 adjusting mechanism is driven by the intelligent control unit 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 (alarm or 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 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. After the on-line gas density relay is checked, the device automatically restores to the working state, the valve is opened, the on-line checking 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 detection device automatically compares and judges the checking and detecting result.

Preferably, after the device completes the checking work of the gas density relay, if the device is abnormal, the device can automatically send out an alarm and upload the alarm to a remote end in various modes or send the alarm to a designated receiver, such as a mobile phone.

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

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 detection device 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 having a density relay maintenance-free intelligent detection device, comprising: the system comprises a plurality of high-voltage electrical equipment with a (sulfur hexafluoride) air chamber and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with the (sulfur hexafluoride) air chamber, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system sequentially through a concentrator and a protocol converter; the density relay maintenance-free intelligent detection devices are respectively arranged on the electrical equipment corresponding to the air chambers.

Preferably, the method comprises the following steps: the system comprises a plurality of high-voltage electrical equipment with a (sulfur hexafluoride) air chamber and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with the (sulfur hexafluoride) air chamber, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system through a concentrator and an IEC61850 protocol converter in sequence; the density relay maintenance-free intelligent detection devices are respectively arranged on the electrical equipment corresponding to the air chambers.

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

Preferably, the maintenance-free intelligent gas density monitoring device uploads various sensor data to an internet of things cloud platform in a wired or wireless communication mode; wherein the wired communication mode comprises industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable or PLC power carrier; 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 or sonar and the like.

Preferably, the device 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 combined 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 has the beneficial effects that:

The invention provides a maintenance-free intelligent detection device, a method and a monitoring system for a density relay, wherein a valve is closed by an intelligent control unit, so that a gas density relay is isolated from electrical equipment on a gas path; pressure is adjusted through a pressure adjusting mechanism, so that the density relay generates contact action, the contact action is transmitted to an intelligent control unit through an online checking contact signal sampling unit, the intelligent control unit detects alarm or locking contact action value and/or return value of the gas density relay according to density value when the contact acts, and checking 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 described below, 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 schematic structural view of example 12 of the present invention.

FIG. 14 is a schematic structural view of example 13 of the present invention.

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

FIG. 21 is a diagram of another control circuit of the present invention.

FIG. 22 is a schematic diagram of a 4-20mA type density transmitter circuit of the present invention.

FIG. 23 is a schematic structural view of example 14 of the present invention.

Fig. 24 is a schematic structural diagram of the maintenance-free intelligent gas density monitoring system of the invention.

Fig. 25 is a schematic diagram of another structure of the maintenance-free intelligent gas density monitoring system of the invention.

Fig. 26 is a schematic diagram of another structure of the maintenance-free intelligent gas density monitoring system according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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 fig. 1, the present invention discloses a maintenance-free intelligent detection device for a density relay, which comprises: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7 and a multi-way connector 9; one end of the valve 4 is sealingly connected to the SF₆on the electrical equipment 8, the other end of the valve 4 is communicated with the gas density relay 1; the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is communicated with the gas density relay 1; the online check contact signal sampling unit 6 is respectively connected with the density relay 1 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 an intelligent control unit 7; pressure adjusting mechanism 5 andThe intelligent control unit 7 is connected.

Fig. 2 is a schematic diagram of a control circuit according to embodiment 1 of the present invention, and 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 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; two pairs of normally open contacts J21 and J22 of the relay J2 are connected to the contacts of the gas density relay 1. It can also be: wherein a pair of normally closed contacts J11 of the relay J1 are connected in series in the gas density relay contact control loop; a pair of normally open contacts J21 of the relay J2 are connected to the gas density relay contacts; 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 personal computer, CPU, singlechip, ARM chip, AI chip, MCU, FPGA, PLC etc., industrial control mainboard, embedded main control board etc. and other intelligent integrated circuit. The power source U2 may be: switching 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 adjusting mechanism 5 may be: electric regulating piston, electric regulating cylinder, booster pump, gas cylinder pressurization, valve, electromagnetic valve and flow controller. Semi-automatic pressure adjustment mechanisms that can also be adjusted manually are also possible.

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

The intelligent control unit 7 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 corresponding 2Pressure value P at 0 DEG C₂₀(i.e., gas density value). When the density relay 1 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 device issues a command to close the valve 4 via the intelligent control unit 7 so that the gas density relay 1 is isolated in the gas path from the electrical equipment 8. As shown in fig. 2, the apparatus then issues a command to open the control loop of the gas density relay 1 through the intelligent control unit 7, that is, to open the contacts J11 and J12 of the electromagnetic relay J1 of the online verification contact signal sampling unit 6, so that the safe operation of the electrical equipment 8 is not affected when the gas density relay 1 is verified online, and the alarm signal is not mistakenly issued or the control loop is locked when the gas density relay is verified. Since the gas density value P has already been carried out before the device is checked₂₀Not less than set safety check density value P_SBecause the gas of the electrical equipment 8 is in a safe operating range, and moreover, the gas leakage is a slow process, it is safe to check. Meanwhile, the device then sends out a command, the intelligent control unit 7 is communicated with a contact sampling circuit of the gas density relay 1, namely, the contacts J21 and J22 of the electromagnetic relay J2 of the online verification contact signal sampling unit 6 are closed, and at the moment, the contact PJ of the gas density relay is connected with the intelligent control unit 7 through the contacts J21 and J22 of the electromagnetic relay J2. Then, the device sends out a command, the pressure adjusting mechanism 5 is operated, the driving part 52 (which can be realized by mainly adopting a motor and a gear) of the pressure adjusting mechanism 5 is controlled by the intelligent control unit 7 (the mode is various and flexible), and then the piston 51 of the pressure adjusting mechanism 5 is adjusted, so that the volume of the sealed cavity formed by the piston 51, the gas density relay 1, the valve 4 and the like is changed, the pressure of the gas density relay 1 is gradually reduced, the density relay 1 generates the contact action, the contact action is uploaded to the intelligent control unit 7 through the 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 value T measured during the contact action into the pressure value P corresponding to 20 ℃ according to the gas characteristics₂₀(density value), the contact action value P of the gas density relay can be detected_D20Alarm and/or blocking of gas density relayAfter all the contact action values of the signal are detected. And then the intelligent control unit 7 controls a motor (a motor or a variable frequency motor) of the pressure adjusting mechanism 5, and adjusts a piston 51 of the pressure adjusting mechanism 5 to gradually increase the pressure of the gas density relay 1, so that the return value of the alarm and/or locking contact signal of the gas density relay 1 is tested. The device may be so checked repeatedly (e.g., 2-3 times) and then its average value calculated. After the corresponding requirements are completed, the calibration work of the gas density relay 1 is completed. The device then sends out a command to open the contact sampling circuit of the gas density relay 1 through the intelligent control unit 7, that is, the contacts J21 and J22 of the electromagnetic relay J2 of the online verification contact signal sampling unit 6 are opened, and at this time, 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 device issues a command to open the valve 4 via the intelligent control unit 7, so that the gas density relay 1 is connected to the electrical device 8 via the gas path. The device sends out the instruction again next, through the control circuit of intelligence accuse unit 7 intercommunication gas density relay 1, the contact J11 and the J12 of the electromagnetic relay J1 of online check contact signal sampling unit 6 are closed promptly for the density monitoring circuit of gas density relay 1 normally works, makes gas density relay 1 safety monitoring electrical equipment 8's gas density, makes electrical equipment 8 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 8 cannot be influenced when the gas density relay 1 is checked online. When the verification of the gas density relay 1 is completed, the device makes a judgment and can notify the detection result. The mode is flexible, and particularly can be as follows: 1) the device may be annunciated in situ, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the device can upload the information in an online remote transmission communication mode, for example, the information 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 a word, the device completes the online calibration worker of the gas density relayAfter that, if abnormal, the alarm can be automatically sent out, and can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or after the device finishes the checking work of the gas density relay, if the device is abnormal, the intelligent control unit can upload the alarm contact signals 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. The simple-version density relay is used for on-line verification, the result with abnormal verification result can be uploaded through an alarm signal line, and can be uploaded according to a certain rule, for example, when the result is abnormal, a contact is connected in parallel with an alarm signal contact, and the condition can be obtained through analysis after the contact is regularly closed and opened; 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 short, the reliable performance of the device can be fully ensured in multiple modes and various combinations.

The detection device has a safety protection function, and particularly, when the detection device is lower than a set value, the device automatically sends out an announcement signal without carrying out online verification on the density relay. 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 detection device may perform online verification according to a set time, or may perform online verification according to a set temperature (e.g., a high limit temperature, a high temperature, a low limit temperature, a 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 detection device can compare the error performance of the 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 device is judged. The comparison of each period with history and the comparison of the history and the present are carried out. The device is subjected to physical examination.

The detection device can check repeatedly for multiple times (for example, 2-3 times), and then calculate the average value according to the check result of each time.

When necessary, the detection device can carry out online verification on the density relay 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 can 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 induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance 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, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge). The temperature sensor may be: a thermocouple, a thermistor, a semiconductor type; the temperature sensor can be in contact type or non-contact type; sensor materials and electronic component characteristics, and the temperature sensor can be a thermal resistor and a 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 detection device 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 not need to be tested as desired.

The intelligent control unit mainly completes control of the valve, control of the pressure adjusting 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 adjusting 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 in operation_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 device can automatically carry out comparison and judgment, and if the error difference is large, an abnormal prompt is sent out: gas density relays or pressure sensors, temperature sensors have problems. Namely, the device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter(ii) a The mutual verification of the gas density relay, the pressure sensor and the temperature sensor can be completed. When the device accomplishes the check-up of gas density relay, can carry out the judgement of contrasting each other automatically, if the error phase difference is big, will send unusual suggestion: gas density relays or pressure sensors, temperature sensors have problems. The device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter. The artificial intelligence proofreading capability is realized; after the verification work of the gas density relay is finished, a verification report of the density relay can be automatically generated, if the verification report is abnormal, an alarm can be automatically sent out, or the verification 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, the performance of the decision device is made. The comparison of each period with history and the comparison of the history and the present are carried out. The device can also be subjected to physical examination; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay. The density value of the electrical equipment, the gas density relay, 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 device, 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 gas density relay, electrical equipment, or the device itself is problematic; and monitoring the contact signal state of the gas density relayAnd measuring and remotely transmitting the state of the sensor. 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.

If the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are matched and normal, it can be stated that the device and the gas density relay are normal. Therefore, the gas density relay does not need to be checked, the device does not need to be checked, and the checking can be avoided in the whole service life. Unless the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electric device in the transformer substation are not matched or abnormal with each other, maintenance personnel are arranged to process the signals. 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.

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 verification 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 gas density relay contact signal control loop does not influence the performance of the device, particularly does not influence the performance of the intelligent control unit, and does not damage the device or influence the test work.

Example 2

Referring to fig. 3, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, an electromagnetic valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is hermetically connected with SF₆On the electrical equipment 8, the other end of the self-sealing valve 11 is communicated with the valve 4; one end of the valve 4 is connected with the self-sealing valve 11 in a sealing way, and the other end of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay 1; 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 adjusting mechanism 5 is connected with the intelligent control unit 7. The pressure adjustment mechanism 5 of the present embodiment is mainly composed of the air bag 53 and the driving member 52, which is different from embodiment 1. The pressure adjusting mechanism 5 makes the driving part 52 push the air bag 53 to change the volume according to the control of the intelligent control unit 7, thereby completing the pressure rise and fall. Through this pressure adjustment mechanism regulation pressure for gas density relay 1 takes place the contact action, and the contact action transmits intelligent accuse unit 7 through online check-up contact signal sampling unit 6, and intelligent accuse unit 7 converts 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.

Example 3

Referring to fig. 4, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the device comprises a mixed gas density relay 1, a pressure sensor 2, a temperature sensor 3, an electric valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, an air supply interface 10 and a valve 12. One end of the valve 12 is hermetically connected to the mixed gas electrical equipment 8, and the other end of the valve 12 is communicated with the valve 4; one end of the valve 4 is connected with the valve 12 in a sealing way, and the other end of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2, 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 the gas density relay 1 on a gas path through a multi-way joint 9; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay 1; the air supply interface 10 is arranged on the pressure adjusting mechanism 5. 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 adjusting mechanism 5 is connected with the intelligent control unit 7. Different from the embodiment 1, the pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged together.

Example 4

Referring to fig. 5, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, an electromagnetic valve 4, a pressure adjusting mechanism 5, an online checking joint signal sampling unit 6, an intelligent control unit 7, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is hermetically connected with SF₆On the electrical equipment 8, the other end of the self-sealing valve 11 is communicated with the valve 4; one end of the valve 4 is hermetically connected to the self-sealing valve 11, and the other end of the valve 4 is connected to the gas density relay 1, the pressure sensor 2, the pressure adjusting mechanism 5 and the gas supplementing interface 10 on the gas path. The pressure sensor 2 and the temperature sensor 3 are arranged together and can be combined into a gas density transmitter to directly obtain the density value, the pressure value and the temperature value of the gas; the pressure adjusting mechanism 5 is communicated with the gas density relay 1; 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 directly or indirectly connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with the intelligent control unit 7. The difference from embodiment 1 is that 1, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of a bellows 54 and a drive member 52. The corrugated pipe 54 is connected with the gas density relay 1 in a sealing way to form a reliable sealed cavity. The pressure adjusting 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 sealed cavity changes the volume, and then the pressure is lifted. 2. The pressure sensor 2 and the temperature sensor 3 are arranged together to form gasAnd the density transmitter directly obtains the density value, the pressure value and the temperature value of the gas. Through this pressure adjustment mechanism regulation pressure for gas density relay 1 takes place the contact action, and the contact action transmits intelligent control unit 7 through online check-up contact signal sampling unit 6, and intelligent control unit 7 is according to the density value when gas density relay 1's contact action, 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 1 to finish the checking work of the gas density relay. Or the checking work of the gas density relay is finished as long as the alarm and/or the locking contact action value of the gas density relay 1 is detected. As long as the gas density transmitter and the gas density relay 1 are matched and normal with each other, the gas density transmitter and the gas density relay of the device can be proved to be normal. Therefore, the gas density relay does not need to be checked, the gas density transmitter does not need to be checked, and the checking can be avoided in the whole service life. Unless the gas density transmitter and the gas density relay 1 of a certain electrical device in the substation are not matched or abnormal, maintenance personnel are arranged to process the signals. 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 invention discloses a density relay maintenance-free intelligent detection device, comprising: the device comprises a mixed gas density relay 1, a pressure sensor 2, a temperature sensor 3, an electromagnetic valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and an air supplementing interface 10. One end of the electromagnetic valve 4 is hermetically connected with SF₆The other end of the valve 4 is connected to a multi-way joint 9 on the mixed gas electrical equipment 8. The valve 4 is sealed in the shell 41, and the control cable of the electromagnetic valve 4 is led out through the leading-out wire sealing piece 42 which is well sealed with the shell, so that 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 air supply interface 10 is directly arranged on the gas electrical equipment 8 and can be used for air supply or micro-water test of the gas electrical equipment 8. Gas density relay 1 installationAt the multi-way joint 9; the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the gas density relay 1 are arranged together. The pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is sealed in the shell 55, and a control cable of the pressure adjusting mechanism 5 is led out through a leading-out wire sealing piece 56 which is well sealed with the shell 55, so that the pressure adjusting mechanism 5 is designed to ensure long-term reliable sealing and can work reliably for a long time. 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 adjusting mechanism 5 is connected with the intelligent control unit 7. Unlike embodiment 1, the valve 4 and the pressure adjusting mechanism 5 are sealed inside their housings, respectively; the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the gas density relay 1 are arranged together; the micro-water content sensor is also arranged, the micro-water content of the air chamber of the electrical equipment 8 can be monitored, and the micro-water content in the air chamber can be accurately monitored by combining the circulation of the pressure adjusting mechanism 5 to the gas; and the air make-up interface 10 is arranged directly on the gas electrical apparatus 8.

Example 6

Referring to fig. 7, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is connected to the electrical equipment 8 in a sealing way, and the other end of the self-sealing valve 11 is communicated with the valve 4; one end of the valve 4 is connected with the self-sealing valve 11 in a sealing way, and the other end of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way joint 9, and the pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay 1; the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together; the temperature sensor 3 is arranged in the vicinity of a temperature compensation element inside the housing of the gas density relay 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 adjusting mechanism 5 is connected with the intelligent control unit 7. The obvious difference from embodiment 1 is that the pressure adjusting mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, a heat insulating 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 pressure adjustment mechanism regulation pressure for gas density relay 1 takes place the contact action, and the contact action transmits intelligent accuse unit 7 through online check-up contact signal sampling unit 6, and intelligent accuse unit 7 converts 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.

The working principle of embodiment 6 of the invention is as follows:

When the density relay 1 needs to be checked, the device sends out an instruction to heat the heating element 58 of the pressure adjusting mechanism 5, and when the temperature value T of the temperature sensor 510 of the pressure adjusting mechanism 5 is detected₅₁₀After the temperature difference with temperature value T of temperature sensor 3 reaches the set value, device or system sends out the instruction, can be promptly through accuse unit 7 shut-off valve 4 of intelligence for gas density relay 1 is on the gas circuit with SF₆The electrical equipment 8 is isolated; 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 adjusting mechanism 5, so that the density relay 1 generates alarm and/or locking contact point actions, respectively, the contact point actions are transmitted to the intelligent control unit 7 through the online checking contact point signal sampling unit 6, and the intelligent control unit 7 detects the alarm and/or locking contact point action value and/or return value of the gas density relay according to the density value of the alarm and/or locking contact point actions, thereby completing the checking work of the gas density relay 1.

Example 7

Referring to FIG. 8, the present invention is disclosedThe utility model provides a density relay non-maintaining's intelligent detection device, includes: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and an air supplementing interface 10. One end of the valve 4 is sealingly connected to the SF₆The other end of the valve 4 is connected to a multi-way connector 9 on the electrical equipment 8. The gas density relay 1 is arranged on the multi-way joint 9; pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6, intelligent control unit 7 set up on gas density relay 1. The pressure sensor 2 is communicated with the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with the gas density relay 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 adjusting mechanism 5 is connected with the intelligent control unit 7. The pressure adjustment mechanism 5 of the present embodiment is mainly composed of the solenoid valve 5 and the housing 55, which is different from embodiment 1. The pressure adjusting 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. Pressure is adjusted through this pressure adjustment mechanism 5 (solenoid valve) 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. After the check-up of gas density relay 1's contact action value is 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 1 take place the contact and reset, the contact resets and transmits intelligence through online check-up contact signal sampling unit 6 and controls unit 7, intelligence is controlled unit 7 and is reset pressure value and temperature value when (returning) according to gas density relay 1's contact, convert into corresponding density value, detect the warning of gas density relay 1 and/or shutting contact return value, and then accomplish gas density relay's check-up work.

Example 8

Referring to fig. 9, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and an air supplementing interface 10. One end sealing connection of many lead to joint 9 is on gas insulation electrical equipment 8, and the one end of valve 4 is connected with many lead to joint 9, and the other end of valve 4 is connected with gas density relay 1, pressure sensor 2, pressure adjustment mechanism 5, and tonifying qi interface 10 is connected with many lead to joint 9, and temperature sensor 3 sets up on many lead to joint 9. The gas density relay 1, the pressure sensor 2 and the pressure adjusting mechanism 5 are connected on a gas path. The pressure adjusting mechanism 5 is communicated with the gas density relay 1; 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 adjusting mechanism 5 is connected with the intelligent control unit 7. The difference from example 1 is: 1. the pressure adjustment mechanism 5 of the present embodiment is mainly composed of a piston 51 and a drive member 52. One end of the piston 51 is hermetically connected with the gas density relay 1 to form a reliable sealed cavity. The pressure adjusting mechanism 5 drives the piston 51 to move according to the control of the intelligent control unit 7, so that the volume of the sealed cavity changes, and the pressure rise and fall are completed. 2. 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. Like this through this pressure adjustment mechanism regulated pressure for gas density relay 1 takes place the contact action, and the contact action transmits intelligent accuse unit 7 through online check-up contact signal sampling unit 6, and intelligent accuse unit 7 is according to the density value when the contact of gas density relay 1 moves, 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 1 to finish the checking work of the gas density relay. Or the checking work of the gas density relay is finished as long as the alarm and/or the locking contact action value of the gas density relay 1 is detected.

Example 9

Referring to fig. 10, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the device comprises a mixed gas density relay 1, a pressure sensor 2, a temperature sensor 3, an electric valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, an air supply interface 10, a self-sealing valve 11 and a connecting pipe 14. One end of the self-sealing valve 11 is connected to the gas insulated electrical equipment 8 in a sealing manner, and the other end of the self-sealing valve 11 is communicated with the valve 4 and the air supply interface 10; the other end of the valve 4 is connected to the pressure adjusting mechanism 5 through a connection pipe 14. The gas density relay 1 is arranged on the pressure adjusting mechanism 5; 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 the gas density relay 1. The pressure sensor 2 and the gas density relay 1 are communicated with the pressure adjusting mechanism 5 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 adjusting mechanism 5 is connected with the intelligent control unit 7. Different from the embodiment 1, the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6, the intelligent control unit 7 and the gas density relay 1 are arranged together; the gas density relay 1 is provided on the pressure adjustment mechanism 5.

Example 10

referring to fig. 11, the present invention discloses a density relay maintenance-free intelligent detection device, which comprises: the gas density relay comprises a gas density relay 1, a pressure sensor 21, a pressure sensor 22, a temperature sensor 31, a temperature sensor 32, a valve 4, a pressure adjusting mechanism 5, an online checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is connected to the gas insulated electrical equipment 8 in a sealing manner, and the other end of the self-sealing valve 11 is communicated with the valve 4; and the other end of the valve 4 is connected to a multi-way connection 9. The gas density relay 1, the pressure sensor 22, the temperature sensor 32, the pressure adjusting mechanism 5 and the air supplementing interface 10 are arranged on the multi-way joint 9; the pressure sensor 21 and the temperature sensor 31 are provided in the pressure adjustment mechanism 5. Pressure sensor 21, pressureThe force sensor 22, the temperature sensor 31, the temperature sensor 32 and the intelligent control unit 7 are connected. The pressure sensor 21, the pressure sensor 22 and the gas density relay 1 are communicated with the pressure adjusting mechanism 5 on a 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 adjusting 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 intelligent detection device for the high-voltage electrical equipment, which is provided by the embodiment of the invention and realizes the maintenance-free density relay on-site operation, 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 1 can be checked on line₂₀And comparing and checking each other. If the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32, and the gas density relay 1 are matched with each other and normal, it can be said that both the apparatus and the gas density relay are normal. Therefore, the gas density relay does not need to be checked, the device does not need to be checked, and the checking can be avoided 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 1 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 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 11

Referring to fig. 12, the present invention discloses a density relay maintenance-free intelligent detection device, which comprises: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent control unit 7, an air supply interface 10, a self-sealing valve 11 and a connecting pipe 14. One end of the self-sealing valve 11 is connected to the gas insulated electrical equipment 8 in a sealing manner, and the other end of the self-sealing valve 11 is communicated with the valve 4 and the air supply interface 10 through a connecting pipe 14; the other end of the valve 4 is connected with the gas density relay 1 and the pressure adjusting mechanism 5. The gas density relay 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 together. The pressure sensor 2 and the gas density relay 1 are communicated with the pressure adjusting mechanism 5 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 adjusting mechanism 5 is connected with the intelligent control unit 7. The pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, the intelligent control unit 7, the gas density relay 1 and the pressure adjusting mechanism 5 of the present embodiment are different from those of the embodiment 1 in structural design.

Example 12

Referring to fig. 13, the present invention discloses a density relay maintenance-free intelligent detection device, which comprises: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, an air supply interface 10, a self-sealing valve 11, a micro-water sensor 13 and a decomposition product sensor 15. One end of a self-sealing valve 11 is connected to the gas insulated electrical equipment 8 in a sealing mode, the other end of the self-sealing valve 11 is communicated with the valve 4, and an air supply interface 10 is connected to the self-sealing valve 11; and the other end of the valve 4 is connected to a multi-way connection 9. The gas density relay 1, the pressure sensor 2, the pressure adjusting 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 gas-insulated electrical apparatus 8. 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 gas density relay 1 are communicated with the pressure adjusting mechanism 5 on a gas path; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with the intelligent control unit 7. Unlike embodiment 1, the temperature sensor 3 is provided on the gas-insulated electrical equipment 8; 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

Referring to fig. 14, the invention discloses a density relay maintenance-free intelligent detection device, comprising: the gas density relay comprises a gas density relay 1, a pressure sensor 21, a pressure sensor 22, a temperature sensor 31, a temperature sensor 32, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, an air supplementing interface 10 and a connector 16. One end of the connector 16 is hermetically connected to the gas insulated electrical equipment 8, and the other end of the connector 16 is communicated with the valve 4; the other end of the valve 4 is connected with the multi-way connector 9, the valve 4 is sealed in the shell 41, and a control cable of the electromagnetic valve 4 is led out through a leading-out wire sealing piece 42 which is well sealed with the shell, so that 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 1, the pressure sensor 21, the temperature sensor 31, the pressure adjusting mechanism 5 and the air supply interface 10 are arranged on the multi-way joint 9. The pressure adjusting mechanism 5 is sealed in the shell 55, and a control cable of the pressure adjusting mechanism 5 is led out through a leading-out wire sealing piece 56 which is well sealed with the shell 55, so that the pressure adjusting mechanism 5 is designed to ensure long-term reliable sealing and can work reliably for a long time. The pressure sensor 22 and the temperature sensor 32 are arranged on the connecting head 16. The pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32 are connected with the intelligent control unit 7. When the valve 4 is opened, the pressure sensor 21, the pressure sensor 22, and the gas density relay 1 communicate with the pressure adjusting mechanism 5 on the gas path. When the valve 4 is closed, the pressure sensor 21 and the gas density relay 1 are communicated with the pressure adjusting mechanism 5 on the gas path, and the pressure sensor 22 is not communicated with the gas density relay 1 and the pressure adjusting mechanism 5 on the gas path. Pressure sensor 21, pressure sensor 22, temperature sensor 31. The temperature sensor 32 is connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting 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 intelligent detection device for realizing the maintenance-free density relay in field operation for the gas insulated high-voltage electrical equipment provided by the embodiment 13 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 device automatically does not verify the density relay any more and sends out a notification signal. For example, when the gas density value of the plant is less than the set value, it is not verified. The check can only be carried out when the gas density value of the equipment is not less than (blocking pressure +0.02 MPa). The alarm of the contact point has a state indication. 2) Or during the verification, when the valve 4 is closed, and the density value obtained according to the monitoring of the pressure sensor 22 and the temperature sensor 32 is lower than the set value, the device automatically does not verify the density relay any more, and sends out a notification 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 device is also provided with a plurality of pressure sensors and temperature sensors for mutual verification, and a sensor and a gas density relay for mutual verification, so that the normal operation of the device is ensured. 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; 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; it is even possible to verify the density value Pe of the nominal value of the gas density relay 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 mutually calibratedTesting; 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 1 can be checked on line₂₀And comparing and checking each other. If the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32, and the gas density relay 1 are matched with each other and normal, it can be said that both the apparatus and the gas density relay are normal. Therefore, the gas density relay does not need to be checked, the device does not need to be checked, and the checking can be avoided 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 1 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 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.

Referring to fig. 15, the online verification contact signal sampling unit 6 mainly includes an optical coupler OC1 and a resistor R1. The method comprises the following steps: when the contact PJ of the gas density relay 1 is closed, the optical coupler OC1 is turned on, and the level at OUT6 is low. On the contrary, when the contact PJ of the gas density relay 1 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 MOSFET (metal oxide semiconductor field effect transistor) 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. 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. 16, 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 open or closed state of the contact PJ of the gas density relay 1 can be known by this circuit. The method comprises the following steps: when the contact PJ of the gas density relay 1 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 OUT6 is at a high level. On the contrary, when the contact PJ of the gas density relay 1 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 contact PJ of the gas density relay 1 whether it is open or closed. In combination with the intelligent control unit 7, the contact PJ of the gas density relay 1 can be correspondingly processed and uploaded according to the open or closed state. Therefore, the device can conveniently monitor the state of the contact signal PJ of the gas density relay 1 and remotely transmit the state of the contact signal PJ. 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. 17, the online verification contact signal sampling unit 6 is mainly composed of hall current sensors H1 and H2. When the contact of the gas density relay 1 is 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 1 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: nixie tubes, LEDs, LCDs, HMI, displays, matrix screens, printers, faxes, projectors, mobile phones and the like can be flexibly combined by one or a plurality of types. 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 1 is closed, the optical coupler OC1 is triggered to be conducted, and the OUT6 is at a low level. On the contrary, when the contact PJ of the gas density relay 1 is opened, the optical coupler OC1 is not turned on, and the OUT6 is high. This makes it possible to know the state of the contact PJ of the gas density relay 1 whether it is open or closed.

Referring to fig. 18, 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 protection circuit U4, a display and output U5, a data storage U6 and the like.

Referring to fig. 19, 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 open or closed state of the contact of the gas density relay 1 can be known by this 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.

Referring to fig. 20, 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. 21, 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 731 passes through the surge protection circuit to the communication interface.

Referring to fig. 22, the 4-20Ma 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. 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. The analog pressure sensor passes through the overvoltage protection circuit, the operational amplifier circuit, the modulation circuit and the filter circuit to the microprocessor, so that the microprocessor can acquire a pressure value and an acquired temperature value, and the microprocessor calculates and converts the temperature value to obtain a density value signal. The density value signal passes through a proportion modulation module, a modulation circuit and a current loop to obtain the 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. 23, the present invention discloses a density relay maintenance-free intelligent detection device, which comprises: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting 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 human-computer interface U9, a pressure adjusting mechanism position detecting 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 adjusting mechanism 5, and the two are closely matched and fused together.

Example 15

The invention discloses a detection method of a density relay maintenance-free intelligent detection device, which comprises the following steps:

When the intelligent gas density monitoring device works normally, the gas density in the gas density relay monitoring device is monitored, and meanwhile, the gas density value in the device is monitored on line through the pressure sensor, the temperature sensor and the intelligent control unit.

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

Step S1: adjusting the pressure adjusting mechanism to a verified initial state through the intelligent control unit;

Step S2: closing the valve through an intelligent control unit;

Step S3: and adjusting the online check contact signal sampling unit to a check state through the intelligent control unit. When the check state, cut off density relay contact signal control circuit, density relay contact signal is connected to the unit is controlled to the intelligence.

Step S4: control unit drive pressure guiding mechanism through the intelligence, 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 pressure value when unit according to the contact action, temperature value and is obtained the density value, or directly obtains the density value, detects out gas density relay's contact signal (report to the police or shutting the contact) action value, and the completion gas density relay's contact signal action is worth the check-up work.

Step S5: control unit drive pressure guiding mechanism through the intelligence, make gas pressure slowly rise for gas density relay takes place the contact and resets, the contact signal resets and transmits the intelligence through online check-up contact signal sampling unit and controls the unit, the intelligence is controlled the unit and is obtained the density value according to pressure value, temperature value when the contact resets, or directly obtains the density value, detect out gas density relay's contact signal (report to the police or shutting the contact) return value, the contact signal return of accomplishing gas density relay is worth the check-up work.

Step S6: 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 state. After the on-line gas density relay is checked, the device automatically restores to the working state, the valve 4 is opened, the on-line checking 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 detection device can automatically perform comparison and judgment. After the device finishes the checking work of the gas density relay, if the device 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 control of the intelligent control unit can be controlled on site through a device, or can be controlled through a background or the mutual interaction of the device and the background.

The detection device 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. 24-26, the invention discloses a monitoring system with a density relay maintenance-free intelligent detection device, comprising: the system comprises a plurality of high-voltage electrical equipment with sulfur hexafluoride air chambers and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with sulfur hexafluoride air chambers, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system sequentially through a concentrator and a protocol converter; the density relay maintenance-free intelligent detection devices are respectively arranged on the electrical equipment corresponding to the air chambers.

Further, the gas density monitoring system with the density relay check function comprises: the system comprises a plurality of high-voltage electrical equipment with sulfur hexafluoride air chambers and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with sulfur hexafluoride air chambers, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system sequentially through a concentrator and an IEC61850 protocol converter; the density relay maintenance-free intelligent detection devices are respectively arranged on the electrical equipment corresponding to the air chambers.

Referring to fig. 25 and 26, PC is an online monitoring background host and system, Gateway is a network switch, Server is an integrated application Server, ProC is a protocol converter/online monitoring intelligent unit, HUB is a concentrator, and Z is a maintenance-free intelligent detection device for a density relay for realizing field operation. The online monitoring system architecture: the system diagrams of the simple architecture (fig. 25), the conventional architecture (fig. 26), the 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, and exception handling. 3. Interface configuration: such as Form interface, Web interface, configuration interface, etc.

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 time₆Temperature, pressure, density, micro-water, etc. of gasPhysical quantity and variation trend thereof, and communication interface for uploading data to background system to realize SF of electrical equipment such as circuit breaker and GIS₆The online monitoring function of physical quantities such as gas density, micro water and the like can flexibly set alarm limits, 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: s the gas online monitoring system is constructed by adopting a bus type layered distributed structure, and the requirements of a three-layer system structure of an intelligent substation are met: the intelligent monitoring system comprises a process layer (a sensor layer, namely a density relay maintenance-free intelligent detection device for realizing field operation), a spacer layer (a data transmission and collection processing layer), a station control layer (a monitoring host, a database server and the like), and an integrated intelligent substation online monitoring system can be accessed to the whole 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 field 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 gas density monitoring system with the density relay checking function is characterized in that the concentrator adopts an RS485 concentrator, and the IEC61850 protocol converter is also respectively connected with the network service printer and the network data router.

The communication mode of a plurality of density relay maintenance-free intelligent detection devices for realizing field operation is 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 detection device mainly comprises a gas circuit (capable of passing through a pipeline) connecting part, a pressure adjusting part, a signal measurement control part and the like. The device has compact and reasonable structural arrangement, and each part has good rust-proof and shock-proof capabilities, and is firm to mount and reliable to use. The connection, the dismouting of each pipeline of device are easily operated, and equipment and part are convenient to be maintained. The structural design of the device makes the device 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 device has automatic or manual boosting and reducing functions; the temperature sensor (temperature probe) is mounted close to the location of the on-line density-checked relay or can be close to the on-line density-checked relay temperature compensation element accessory.

the detection device mainly has the functions of carrying out online check measurement on 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 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 detection device meets the requirements of density relay contact verification: the sampling contacts of the online checking contact signal sampling unit are provided with three independent groups of contacts, and the online 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 device converts the measured pressure value and temperature value into a pressure value corresponding to 20 ℃ according to the gas characteristics, namely the detection device has the functions of pressure and temperature measurement and software conversion.

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

In the closed state of the valve 4, the pressure adjustment mechanism 5 can slowly increase or decrease the load when pressurizing or depressurizing the gas density relay 1. 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, until the signal is switched. 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 calculation can be performed using the Betty-Bridgman equation. For SF₆For the mixed gas, the method can be based on the Dalton partial pressure law, the Betty-Bridgman equation and the ideal gas state equationTo perform the calculation.

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 the sensor is internally provided with a 5G/NB-IOT communication module. 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 adjusting 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 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 second of the measuring range, 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 adjusting mechanism can cause volume change under the action of temperature change and external force (magnetic force or a motor and the like), thereby causing pressure lifting change. I.e., a hybrid pressure regulating mechanism in which temperature + external force act 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 device can also be self-tested and has an indication of the operating conditions of the relevant 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 and bevel gear drive; 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 can be driven by automatic valves, power driven valves and manual valves. 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 density device can perform the following functions: 1. the online monitoring of the gas density is carried out, or the online monitoring of the gas density and the trace water can be realized, or the online monitoring of the gas density, the trace water and the content of the decomposition products can be realized; 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 reliably tested through mutual verification of electronic monitoring and mechanical monitoring, and further, the verification can be avoided in the whole service life. Unless the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electric device in the transformer substation are not matched or abnormal with each other, maintenance personnel are arranged to process the signals. 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 device has a self-diagnosis function, and can perform self-diagnosis on each element and diagnose a process, such as a monitoring or checking process; the device has self-checking and comparing performance.

When online check-up 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, the contact signal actuating signal of gas density relay can upload, will make the remark: 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, the pressure sensor, the temperature sensor, the pressure adjusting mechanism, the valve, the online checking contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: 1. the gas density relay, the pressure sensor, the temperature sensor, the online checking contact signal sampling unit and the intelligent control unit can be combined together, are integrally designed and can also be designed in a split mode. Can be arranged on a multi-way joint and can also be connected together through a connecting pipe. In short, the flexible arrangement is achieved. The structure of the device can be very flexible: for example, valves, relays, pressure adjustment mechanisms may be provided on the multi-way joint; the valve can be directly connected with electrical equipment, or can be connected with the electrical equipment 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 to realize integrated design. In short, the structure is not limited.

The detection device automatically generates a check report of the density relay according to a check result, the report format can be flexible, and the detection result is abnormal, and the detection device can be networked with a mobile phone or uploaded.

After the detection device 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 or can be sent to a designated receiver, for example, a mobile phone. Or, after the device finishes the check-up work of the gas density relay, if the device is abnormal, the intelligent control unit can upload the far-end (a monitoring room, a background monitoring platform and the like) through the alarm contact signal of the density relay and can also display the notice on site, in a word, the reliable performance of the device can be fully ensured in multiple modes and various combinations.

control of the detection device: the method can be realized on site, or in the background, or in combination and interaction between site and background.

The detection device has a safety protection function, and particularly, when the detection device is lower than a set value, the device automatically does not check the density relay any more and sends out an informing 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 value 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 detection device may perform the verification according to a set time, or may perform the verification according to a set temperature (for example, a limit high temperature, a limit low temperature, a normal temperature, 20 degrees, or the like). 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 detection device 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, the performance of the decision device is made. The comparison of each period with history and the comparison of the history and the present are carried out. The device is experienced. The device can be checked repeatedly for 2-5 times, and the average value of the device is calculated. When the device is necessary, the density relay can be checked at any time.

The check result of the density relay by the detection device can be uploaded through density on-line remote transmission; or through wireless uploading; or uploaded by another route; or uploaded separately.

The simple-version density relay is used for on-line verification, and the result with abnormal verification result can be uploaded 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 bourdon tube or a corrugated tube with a slide wire resistor; a pressure measurer combining the induction coil through a bourdon tube or a corrugated tube; (Dong, early in the Instrument industry)

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

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

It is possible to analyze the software by an expert,Professional background result analysis is provided through methods of trend analysis, online measurement of density values and internal micro-water values, online verification data of density relays, comparison of test maps and the like, and a test report is automatically generated and is used for SF₆the 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, the density relay is checked, the requirements of power grid automation and equipment state maintenance are met, and the method plays an important role in improving the safe operation and operation management level of a 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 can be used in the existing of the transformer substation, and can also be used in a new manner. I.e. may be absent from the device.

The device has the pressure sensor of many forms, can automatic accurate test absolute pressure type gas density relay and relative pressure type gas density relay's function. 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 device 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 detection device can measure the rated pressure value and the contact action value of various types of gas density relays, and the corresponding return value and switching difference of the 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 device has the main functions of measuring the contact value (pressure value during alarm/locking action) and/or the 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 the corresponding pressure value at 20 ℃, realizing the performance detection of the contact value (alarm and locking) and/or the rated pressure value of the gas density relay on line and completing the on-line verification work of the gas density relay. Or the device mainly has the functions of measuring the contact value (pressure value during alarm/locking action) and/or the 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 the corresponding pressure value at 20 ℃, and realizing the performance detection of the contact value (alarm and locking) and/or the 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. 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 through the pressure adjusting mechanism to rise and fall, 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 device converts the measured pressure value and the temperature value into the pressure value corresponding to 20 ℃ according to the gas characteristics, namely the detection device has the functions of pressure and temperature measurement and software conversion. The device is provided with an absolute pressure sensor and a relative pressure sensor according to requirements. The device 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 device 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 transmitted in a long distance 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, cables 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 device also comprises a multi-way joint, and the gas density relay, the valve and the pressure adjusting mechanism are arranged on the multi-way joint. The device also comprises a multi-way joint and a self-sealing valve, wherein the gas density relay, the valve, the pressure adjusting mechanism and the self-sealing valve are arranged on the multi-way joint. The valve is embedded in the multi-way joint. The gas density relay, the valve and the pressure adjusting 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 adjustment mechanism can slowly increase or decrease the load when the gas density relay is boosted or depressurized. When measuring the action value of the contact signal of the gas density relay, the load change speed is not more than 10 per second of the measuring range when approaching the action value. I.e. the pressure is adjustable (can rise or fall smoothly). The pressure adjusting 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 adjusting 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 adjusting 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 adjusting 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. The pressure adjusting mechanism is also provided with a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber. The temperature variation effect is improved. Or the pressure adjusting 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 complete 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 adjusting 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 adjusting 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, so that the pressure is lifted and lowered. Or the pressure adjusting mechanism is a deflation valve, and the pressure is lifted through the deflation valve. Or the pressure adjusting 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 adjusting mechanism is a compressor, and the pressure is lifted through the compressor. Or the pressure adjusting 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 adjusting mechanism is sealed in a cavity or a shell to ensure sealing. Alternatively, the valve and pressure adjustment mechanism are sealed within a chamber or housing to ensure a seal. 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 arranged in the vicinity of a temperature compensation 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, 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 measuring sensor can also adopt a density measuring sensor of a quartz tuning fork technology, namely, the constant resonance frequency of a quartz oscillator in vacuum and the resonance frequency difference of a quartz oscillator which is homologous in the measured gas are directly proportional to the density of the measured gas, and the analog signal or the digital signal of the gas density value is obtained after 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 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 the contact signal of the gas density relay 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 connected with the intelligent control unit, and the intelligent control unit is connected with the intelligent control unit. 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 checking of the density relay can be completed regularly according to the setting or the instruction of the background, namely the time for checking the density relay on line is set regularly.

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 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 device can automatically carry out comparison and judgment, and if the error difference is large, an abnormal prompt is sent out: gas density relays or pressure sensors, temperature sensors have problems. The device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter.

The device can complete mutual verification of the gas density relay, the pressure sensor and the temperature sensor. When the device accomplishes the check-up of gas density relay, can carry out the judgement of contrasting each other automatically, if the error phase difference is big, will send unusual suggestion: gas density relays or pressure sensors, temperature sensors have problems. The device can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter. The method has the capability of artificial intelligence proofreading.

The device contains a plurality of pressure sensors, a plurality of temperature sensors, and 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 sensors and the gas density relay, so that the normal operation of the device 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 device can carry out the zero bit check of pressure automatically to judge, if the error phase difference is big, will send unusual suggestion: pressure sensors have problems. Namely, the device can complete the zero calibration function of the pressure sensor.

The device can finish the calibration of the temperature sensor. The method comprises the following steps: the device compares the transmitted environmental temperature value with the sampling value of the temperature sensor.

After the gas density relay is checked, the device 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, such as 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 in parallel, and then the intelligent control unit can regularly close and open the contact JD. 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 device 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 device still includes: 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 device can monitor the gas density value on line, or the density value, the pressure value and the temperature value. Or the device also comprises a micro-water sensor which can monitor the micro-water value of the gas on line. Or the device 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 device also comprises a decomposition product sensor which can monitor the gas decomposition products on line.

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

The device can carry out the comparison of its error performance according to the density relay under different temperatures, different time quantums. I.e. comparisons over the same temperature range at different times, the performance of the decision device is made. The comparison of each period with history and the comparison of the history and the present are carried out. Physical examination can also be performed on the device. The device can be checked repeatedly for a plurality of times (for example, 2-3 times), and the average value of the check values is calculated. When the device is necessary, the density relay can be checked at any time. The verification result of the device 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 device has a gas density relay, and determines whether the density value of the monitored electrical equipment is normal. The density value of the electrical equipment, the gas density relay, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, the gas density monitoring device, the gas density relay and the like can be judged, compared and analyzed.

The device has a plurality of pressure sensors and temperature sensors. And multiple monitoring and comparison are carried out, so that the reliability is ensured.

The device is provided with pressure sensors on two sides of the air 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 monitors the pressure value of the gas density relay.

The device is provided with density relay or density switch at the front end of valve 4, the signal of a safe check set point of output, 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 device monitors that the gas pressure is abnormal on line, the calibration of the gas density relay can be started, so that the performance of the gas density relay can be known, and comparison and analysis can be further performed.

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

The device can carry out the check-up to temperature sensor according to atmospheric environment's temperature value.

The device can also carry out internal temperature on-line monitoring on the electrical equipment. The device also comprises a camera for monitoring the device.

The device 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 a gas density relay, electrical equipment, or the device itself is problematic.

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

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

The device also detects the temperature compensation performance, the contact point resistance and the insulation performance of the gas density relay, or detects and judges. An insulation resistance measuring circuit is added on the device, and specifically: a voltage and current method is adopted, namely Rjy ═ Uy/Iy.

The device also monitors the contact signal state of the gas density relay.

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

The device can also be used for online air supplement. Alternatively, the apparatus may also be subjected to on-line gas drying.

The device has the protection to the electronic environment temperature, prevents to work excessively low temperature or too high temperature, makes its work in the temperature range that allows. 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.

The device has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

The detection method of the density relay maintenance-free intelligent detection device for realizing field operation comprises the following steps:

1) Adjusting the pressure adjusting 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 check state, cut off density relay contact signal control circuit, density relay contact signal is connected to the unit is controlled to the intelligence.

4) Control unit drive pressure guiding mechanism through the intelligence, 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 pressure value when unit according to the contact action, temperature value and is obtained the density value, 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 unit drive pressure guiding mechanism through the intelligence, make gas pressure slowly rise for gas density relay takes place the contact and resets, 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 unit and is obtained the density value according to pressure value, temperature value when the contact resets, or directly obtains the density value, detects out gas density relay's contact signal (report to the police 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 recovers the normal operation state. After the on-line gas density relay is checked, the device automatically restores to the working state, the valve 4 is opened, the on-line checking 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 device can automatically compare and judge the checking and detecting result. After the device finishes the checking work of the gas density relay, if the device is abnormal, the device can automatically send out an alarm, and the alarm can be uploaded to a remote end in various modes or can be sent to a designated receiver, such as 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 device can monitor the gas density value, the pressure value and the temperature value of the electrical equipment on line, and realize the on-line monitoring of the gas density of the electrical equipment.

A monitoring system having a density relay maintenance-free intelligent detection device, comprising: a plurality of density relay maintenance-free intelligent detection devices of a plurality of high-voltage electrical equipment provided with sulfur hexafluoride gas chambers for realizing field operation are connected with a remote background detection system sequentially through a concentrator and a protocol converter; the intelligent detection device for realizing the maintenance-free density relay in field operation is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber. Or, comprising: a plurality of density relay maintenance-free intelligent detection devices of a plurality of high-voltage electrical equipment provided with sulfur hexafluoride gas chambers for realizing field operation are connected with a remote background detection system through a concentrator and an IEC61850 protocol converter in sequence; the intelligent detection device for realizing the maintenance-free density relay in field operation is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber. 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 a plurality of intelligent detection devices which realize the maintenance-free operation of the density relay on site 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 device 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.

the invention collects the pressure (value): the pressure value acquisition device 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-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.

The invention collects the temperature (value): 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 to the control processing means: the temperature sensing element directly provides primary electric signals, and the primary electric signals are provided in a temperature transmitting module mode 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 scheme can be flexibly designed according to the condition of the electrical equipment.

The intelligent control unit of the invention: as the core of the operation control of the whole device of the on-line checking gas density relay, the device collects the contact signals of the density relay of an external sensor (pressure, temperature or density) and a sampling unit, receives the input information of a human-computer interface, and outputs the checking detection result in the modes of uploading a human-computer interface display screen, a printer, an external memory, a communication interface and the like through operation, thereby realizing the on-line 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.

Pressure adjusting mechanism 5 of the present invention: the pressure adjusting mechanism 5 is further provided with a control system, and the intelligent control unit 7 and a driving part 52 (which can be realized by mainly adopting a motor and a gear and has various and flexible modes) of the control pressure adjusting mechanism 5 can be well controlled by the control system 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 density relay maintenance-free intelligent detection device is characterized in that the detection device is connected with an electrical device and a gas density relay, the electrical device is communicated with one end of a valve, and the gas density relay is communicated with the other end of the valve; its characterized in that, density relay non-maintaining's intelligent detection device includes: the device comprises a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit; the pressure adjusting mechanism is communicated with the gas density relay; the online check contact signal sampling unit is respectively connected with the density relay and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the intelligent control unit.

2. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device comprises the valve, one end of the valve is communicated with electrical equipment, and the other end of the valve is communicated with a pressure adjusting mechanism and/or a gas density relay.

3. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device further comprises a gas density detection sensor, and the gas density detection sensor is communicated with the pressure adjusting mechanism and/or the gas density relay on a gas path.

4. The density relay maintenance-free intelligent detection device as claimed in claim 3, wherein the gas density detection sensor adopts a pressure sensor and a temperature sensor; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or a density detection sensor using quartz tuning fork technology.

5. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 2, wherein the intelligent control unit is used for controlling the valve, controlling the pressure adjusting mechanism, collecting pressure and collecting temperature; or completing control of the valve, control of the pressure adjusting mechanism and density value acquisition.

6. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 5, wherein the valve is closed by the intelligent control unit, so that the gas density relay is isolated from the electrical equipment on the gas path; adjust the gas pressure through pressure adjustment mechanism and go up and down for density relay takes place the contact signal action, and the contact signal action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, and the intelligence is controlled the density value when unit according to the contact signal action, detects out gas density relay's contact signal action value and/or return value, accomplishes gas density relay's check-up work online.

7. The density relay maintenance-free intelligent detection device as claimed in claim 6, wherein the online verification contact signal sampling unit is used for verifying that the contact verification of the gas density relay meets the following requirements: the contact signal sampling unit has independent multiple groups of sampling contacts, can automatically complete verification on multiple pairs of contacts at the same time, and continuously measures the action values of the multiple pairs of contacts without replacing the contacts or reselecting the contacts.

8. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 2, wherein the intelligent control unit is based on embedded algorithm and control program of microprocessor embedded system, and automatically controls the whole verification process, including all peripheral devices, logic and input/output.

9. The density relay maintenance-free intelligent detection device as claimed in claim 1, 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 density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device automatically and accurately tests 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 density relay maintenance-free intelligent detection device as claimed in claim 10, wherein the detection device is provided with a human-computer interaction module: the method comprises the steps of refreshing a current data value in real time through a data display interface; and a data input function capable of inputting parameter set values.

12. The density relay maintenance-free intelligent detection device as claimed in claim 11, wherein the intelligent control unit of the device has an IO interface: test data storage can be completed; and/or test data derivation; and/or the test data may be printed; and/or carrying out data communication with an upper computer; and/or inputting analog quantity and digital quantity information.

13. The density relay maintenance-free intelligent detection device 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 the verification result information remotely.

14. The density relay maintenance-free intelligent detection device 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, a cable line, and the like; 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 modes.

15. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 2, wherein 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.

16. The density relay maintenance-free intelligent detection device of claim 15, wherein the valve is sealed in a cavity or housing.

17. The density relay maintenance-free intelligent detection device according to claim 15 or 16, wherein in the valve closing state, the pressure adjusting mechanism can slowly increase or decrease the load when the gas density relay is boosted or depressurized; 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 density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjustment mechanism is a closed air chamber, a heating element is arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is conducted by heating the heating element, so as to complete the rise and fall of the gas pressure.

19. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjustment mechanism is a closed air chamber, a refrigeration 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 the refrigeration element, so as to complete the rise and fall of the gas pressure.

20. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjustment mechanism is a closed air chamber, a heating and cooling element is arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is guided by the heating and cooling element, so as to complete the pressure rise and fall.

21. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjustment 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 by heating or cooling the semiconductor, so as to complete the pressure rise and fall.

22. The density relay maintenance-free intelligent detection device as claimed in claim 18, 19, 20 or 21, wherein the pressure adjusting mechanism is further provided with a heat preservation member, and the heat preservation member is arranged outside the closed air chamber.

23. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting 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 density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting mechanism is an air bag, and the air bag is adjusted by magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism or a pneumatic element to complete the pressure rise and fall.

25. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting mechanism is a bellows, and the pressure is adjusted to rise or fall by a magnetic force or a motor, a reciprocating mechanism, a carnot cycle mechanism or a pneumatic element.

26. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting mechanism is a release valve, the release valve is sealed in an air chamber or connected with a sealed air chamber, and the pressure is raised or lowered through the release valve.

27. the density relay maintenance-free intelligent detection device as claimed in claim 26, wherein the pressure adjustment mechanism further comprises a flow valve, and the pressure rise and fall are completed through the flow valve and a deflation valve.

28. The density relay maintenance-free intelligent detection device as claimed in claim 26 or 27, wherein the purge valve is a solenoid valve or an electric valve.

29. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting mechanism is a compressor, and the pressure is raised or lowered by the compressor.

30. The density relay maintenance-free intelligent detection device as claimed in claim 17, wherein the pressure adjusting mechanism is a pump, and the pressure is increased or decreased by the pump.

31. The density relay maintenance-free intelligent detection device 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 density relay maintenance-free intelligent detection device as claimed in claim 30, wherein the pump is a pressurizing pump, an electric air pump or an electromagnetic air pump.

33. The density relay maintenance-free intelligent detection device as recited in claim 17, wherein the pressure adjustment mechanism is sealed in a cavity or housing.

34. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 2, wherein the valve and the pressure adjusting mechanism are sealed in a cavity or a shell.

35. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein 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.

36. The density relay maintenance-free intelligent detection device as claimed in claim 35, wherein the temperature sensor is arranged on or in the housing of the gas density relay or outside the housing.

37. The density relay maintenance-free intelligent detection device as claimed in claim 36, wherein the temperature sensor is arranged near a temperature compensation element of the gas density relay.

38. The density relay maintenance-free intelligent detection device as claimed in claim 35, wherein the online check contact signal sampling unit and the intelligent control unit are arranged together.

39. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the pressure sensor and the temperature sensor are arranged on the gas density relay; or the gas density relay, the pressure sensor and the temperature sensor are of an integrated structure, and the remote transmission type gas density relay directly remotely transmits density, pressure and temperature signals and the contact signal state of the remote transmission type gas density relay.

40. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the pressure sensor and the temperature sensor are of an integrated structure; or the pressure and temperature sensor is a gas density transmitter with an integrated structure, 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 density relay maintenance-free intelligent detection device as claimed in claim 40, wherein the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

42. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the gas density relay is a remote transmission density relay.

43. The density relay maintenance-free intelligent detection device as claimed in claim 2, wherein the online 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 density relay maintenance-free intelligent detection device as claimed in claim 43, wherein the online verification contact signal sampling unit and the gas density relay contact signal are isolated in circuit by photoelectricity, so as to ensure that the intelligent control unit is protected during verification.

45. The density relay maintenance-free intelligent detection device as claimed in claim 43, wherein the online verification contact signal sampling unit is provided with a protection circuit, so that the intelligent control unit is prevented from being affected during verification.

46. The density relay maintenance-free intelligent detection device as claimed in claim 1, further comprising a clock, wherein the clock is arranged on the intelligent control unit, and the time for checking the density relay is periodically set or the test time is recorded.

47. The density relay maintenance-free intelligent detection device as claimed in claim 1, further comprising a power supply circuit and a rechargeable battery.

48. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the online verification contact signal sampling unit is not lower than 24V for testing the contact signal action value or the switching value of the density relay.

49. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein when the gas density relay is provided with a rated pressure value output signal, the rated pressure value output signal is connected with the intelligent control unit.

50. The density relay maintenance-free intelligent detection device 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 calibration of the rated pressure value of the gas density relay; the device or the background automatically carries out comparison and judgment, and if the error difference is large, an abnormal prompt is sent out.

51. The density relay maintenance-free intelligent detection device as claimed in claim 50, wherein the detection device can complete mutual verification of the gas density relay, the pressure sensor and the temperature sensor. When the device completes the calibration of the gas density relay, mutual comparison and judgment can be automatically carried out, and if the error difference is large, an abnormal prompt can be sent out.

52. The density relay maintenance-free intelligent detection device as claimed in claim 51, wherein a plurality of pressure sensors and temperature sensors are provided, the intelligent control unit completes mutual verification of test data of the plurality of pressure sensors and temperature sensors and mutual verification of the test data of the plurality of pressure sensors, temperature sensors and gas density relay, and therefore normal operation of the device is ensured.

53. The density relay maintenance-free intelligent detection device as claimed in claim 49, wherein the pressure adjustment mechanism adjusts the gas pressure to zero, the intelligent control unit simultaneously collects the pressure value of the pressure sensor at that time, the device automatically performs zero calibration of the pressure sensor and performs judgment, and if the error is large, an abnormal prompt is given.

54. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device can complete the calibration of the temperature sensor.

55. A density relay maintenance-free intelligent detection device as claimed in claim 50, 51 or 52, wherein after the gas density relay verification operation is completed, the device automatically generates a density relay verification report, and if an abnormality occurs, an alarm can be automatically sent out or sent to a designated receiver.

56. The density relay maintenance-free intelligent detection device as claimed in claim 50, 51 or 52, wherein after the verification of the gas density relay is completed, if an abnormality occurs, the intelligent control unit can upload the information through the alarm contact signal line of the density relay, and the information is processed through the receiver after uploading, so that the verification condition of the gas density relay can be conveniently known.

57. The intelligent density relay maintenance-free detection device as claimed in claim 56, wherein the density value and the verification result are displayed on site in site or displayed in a background.

58. The density relay maintenance-free intelligent detection device as claimed in claim 57, 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.

59. The density relay maintenance-free intelligent detection device 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 adjusting mechanism position detection and execution controller, wherein the human-computer interface, the valve controller and the pressure adjusting mechanism position detection and execution controller are all electrically connected with the microprocessor.

60. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device further comprises a micro water sensor, and the micro water sensor is connected with the gas density relay and can monitor a gas micro water value on line.

61. The density relay maintenance-free intelligent detection device as claimed in claim 1, further comprising a micro water sensor and a gas circulation mechanism, wherein the micro water sensor and the gas circulation mechanism are both connected with the gas density relay, and can monitor the micro water value in gas on line.

62. The density relay maintenance-free intelligent detection device as claimed in 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 and monitoring the micro water value in the gas on line.

63. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device further comprises a decomposition product sensor, and the decomposition product sensor is connected with the gas density sensor and can monitor gas decomposition products on line.

64. The density relay maintenance-free intelligent detection device as claimed in claim 11, wherein the detection device has a safety protection function, and when the gas density value of the electrical equipment is lower than a set value, the density relay is automatically not verified any more, and a corresponding notification signal is sent out.

65. The density relay maintenance-free intelligent detection device as claimed in claim 1 or 65, wherein the error determination requirement of the detection device changes along with the temperature change.

66. The density relay maintenance-free intelligent detection device as claimed in claim 65, wherein the detection device can compare error performance of the density relay at different temperatures and different time periods.

67. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the device can repeatedly check the density relay for a plurality of times and calculate the average value of the density relay.

68. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the verification result of the density relay by the detection device can be uploaded in various ways.

69. The density relay maintenance-free intelligent detection device as claimed in claim 50, 51 or 52, wherein the detection device is provided with a gas density relay, and whether the density value of the monitored electric equipment is normal or not is judged. The density value of the electrical equipment, the gas density relay, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, the device, the gas density relay and the like can be judged, compared and analyzed.

70. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein pressure sensors are respectively arranged on two sides of the air passage of the valve. During the check-up, when the valve was closed, the pressure value of a pressure sensor monitoring electrical equipment itself, and then the density value of monitoring electrical equipment itself constantly, it is safe to guarantee that the check-up process is, and the pressure value of another pressure sensor monitoring gas density relay.

71. The density relay maintenance-free intelligent detection device as claimed in claim 70, wherein when the detection device monitors that the gas density of the electrical equipment is abnormal on line, the detection device starts the verification of the gas density relay, so as to know the performance of the gas density relay and perform comparative analysis.

72. The density relay maintenance-free intelligent detection device as claimed in claim 71, wherein when the gas pressure is monitored to have a rising trend on line, an abnormal notice is timely provided.

73. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device is used for carrying out on-line internal temperature monitoring on electrical equipment.

74. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device further comprises a camera for monitoring the detection device or/and the gas density relay.

75. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device further comprises an analysis system for detecting, analyzing and judging the gas density monitoring, the gas density relay and the monitoring element of the electrical equipment.

76. The density relay maintenance-free intelligent detection device as claimed in claim 7, wherein the detection device is further used for monitoring the contact signal state of the gas density relay and remotely transmitting the state.

77. The density relay maintenance-free intelligent detection device as claimed in claim 76, wherein the detection device is further capable of detecting, or detecting and determining, the temperature compensation performance of the gas density relay.

78. The density relay maintenance-free intelligent detection device as claimed in claim 7, wherein the device can also detect, or detect and determine contact resistance of the contact of the gas density relay.

79. the density relay maintenance-free intelligent detection device as claimed in claim 7, wherein the device is further used for detecting or detecting and judging the temperature compensation performance, the contact point contact resistance and the insulation performance of the gas density relay.

80. The intelligent density relay maintenance-free detection device as claimed in claim 77, wherein the device further monitors the control loop state of the contact signal of the gas density relay.

81. The density relay maintenance-free intelligent detection device as claimed in claim 77 or 80, wherein the device can also perform online air supplement control.

82. The density relay maintenance-free intelligent detection device as claimed in claim 81, wherein the device can also perform online gas drying control.

83. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device has protection for environmental temperature of electronic components, and can prevent operation at too low temperature or too high temperature, so that the detection device can operate in an allowable temperature range.

84. The density relay maintenance-free intelligent detection device as claimed in claim 1, wherein the detection device has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction on electrical equipment.

85. A density relay maintenance-free intelligent detection device is characterized in that the detection device is connected with electrical equipment, a remote transmission gas density relay and a valve, one end of the valve is communicated with the electrical equipment, and the other end of the valve is communicated with the remote transmission gas density relay; its characterized in that, density relay non-maintaining's intelligent detection device includes: the device comprises a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit; the pressure adjusting mechanism is communicated with the remote transmission gas density relay; the online check contact signal sampling unit is respectively connected with the remote transmission gas density relay and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the intelligent control unit.

86. A detection method of a density relay maintenance-free intelligent detection device is characterized in that,

The detection device is used for detecting the gas density relay according to the set verification time or the verification instruction and the gas density value condition under the condition of allowing the verification of the gas density relay:

1) Closing the valve through an intelligent control unit;

2) the online check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, a density relay contact signal control loop is cut off or isolated, and a density relay contact signal is connected to the intelligent control unit;

3) The pressure adjusting 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, the 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 adjusting 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.

87. The method as claimed in claim 86, wherein the detection device automatically compares and determines the checking and detecting results.

88. The detecting method for the intelligent detecting device of the density relay without the maintenance as claimed in claim 86, wherein after the device completes the checking work of the gas density relay, if the gas density relay is abnormal, the device can automatically send out an alarm, and the alarm can be uploaded to a remote end in various modes or sent to a designated receiver.

89. The detecting method for the intelligent detecting device of the density relay without the maintenance as claimed in claim 86, wherein after the checking work of the gas density relay is completed, if the gas density relay is abnormal, the intelligent control unit uploads the abnormal signal through the alarm contact signal line of the density relay.

90. The method as claimed in claim 86, wherein the density value and the verification result are displayed on site or in the background.

91. The detecting method for the intelligent detecting device of the density relay without the maintenance as claimed in claim 86, wherein the control of the intelligent control unit is achieved through field control, or through background control, or through mutual interaction of the field control and the background control.

92. The detecting method of claim 86, wherein the detecting device 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.

93. A monitoring system with a density relay maintenance-free intelligent detection device is characterized by comprising: the system comprises a plurality of high-voltage electrical equipment with air chambers and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with air chambers, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system sequentially through a concentrator and a protocol converter.

94. A monitoring system having a density relay maintenance-free intelligent detection device as claimed in claim 93, comprising: the system comprises a plurality of high-voltage electrical equipment with air chambers and a plurality of maintenance-free intelligent detection devices correspondingly connected with the high-voltage electrical equipment with air chambers, wherein the maintenance-free intelligent detection devices are connected with a remote background detection system through hubs and IEC61850 protocol converters in sequence.

95. The monitoring system with intelligent density relay maintenance-free detection device as claimed in claim 94, wherein the hub is an RS485 hub, and the IEC61850 protocol converter is further connected with the network service printer and the network data router respectively.

96. The monitoring system with the density relay maintenance-free intelligent detection device as claimed in claim 93, wherein the maintenance-free intelligent gas density monitoring device uploads various sensor data to an internet of things cloud platform in a wired or wireless communication mode; the wired communication mode comprises an industrial bus, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable or PLC power carrier; the wireless communication mode comprises a sensor built-in 5G/NB-IOT communication module, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication or sonar.