CN110429003B - Transmitter for on-line check density relay and implementation method and system thereof - Google Patents
Transmitter for on-line check density relay and implementation method and system thereof Download PDFInfo
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- CN110429003B CN110429003B CN201910830189.XA CN201910830189A CN110429003B CN 110429003 B CN110429003 B CN 110429003B CN 201910830189 A CN201910830189 A CN 201910830189A CN 110429003 B CN110429003 B CN 110429003B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
- G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2671—Means to detect leaks in the pressure sensitive element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
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Abstract
The application provides a transmitter for an on-line check density relay and an implementation method thereof, wherein the transmitter comprises a shell, and a pressure sensor, a temperature sensor, a communication module, an intelligent control unit and an equipment connecting joint which are arranged in the shell, wherein the transmitter is communicated with electrical equipment through the equipment connecting joint; the transmitter also comprises a gas density relay, a valve, a pressure regulating mechanism and an on-line check joint signal sampling unit. The transmitter controls the pressure lifting of the pressure regulating mechanism through the intelligent control unit, so that the gas density relay is subjected to contact action, the intelligent control unit detects the contact action value and/or the return value of the gas density relay according to the density value during contact action, remote transmission is realized through the communication module, verification of the gas density relay is completed, maintenance personnel is not required to go to the site to operate, and maintenance-free electrical equipment is realized. The application also provides a monitoring system applying the transmitter.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a transmitter applied to high-voltage and medium-voltage electrical equipment and used for checking a density relay on line, and an implementation method and a system thereof.
Background
The gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage and medium-voltage electrical equipment, a contact signal control loop is arranged in the gas density relay, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage and medium-voltage electrical equipment, when gas leakage is detected, a contact of the gas density relay acts to generate a contact signal, and the contact signal control loop gives an alarm or locks according to the contact signal, so that safe operation protection of the electrical equipment is realized.
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to the power departments and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the development of economy and high speed, the capacity of the power system in China is rapidly enlarged, and the use amount of SF6 electrical equipment is increased. The SF6 gas has the functions of arc extinction and insulation in high-voltage electrical equipment, and the density reduction and micro water content of the SF6 gas in the high-voltage electrical equipment seriously affect the safe operation of the SF6 high-voltage electrical equipment if exceeding the standards: 1) The reduction of SF6 gas density to a certain extent will lead to a loss of insulation and arc extinction properties. 2) Under the participation of some metal matters, SF6 gas can be hydrolyzed with water at a high temperature of more than 200 ℃ to generate active HF and SOF 2, corrode insulating parts and metal parts, and generate a large amount of heat so as to raise the pressure of the air chamber. 3) At reduced temperatures, excessive moisture may form condensation water, significantly reducing the insulation strength of the insulator surface and even flashover, causing serious damage. The grid operating regulations therefore mandate that the density and water content of SF6 gas must be periodically checked both before and during operation of the plant.
With the development of unmanned substations to networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the on-line monitoring of the gas density and micro water content states of SF6 electrical equipment has important practical significance. Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high voltage electrical equipment is very popular, and existing gas density monitoring systems (devices) are basically: 1) The remote SF6 gas density relay is used for collecting density, pressure and temperature, uploading and on-line monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition, uploading and on-line monitoring of the density, the pressure and the temperature of the gas. SF6 gas density relay is a core and key component. However, because the field operation environment of the high-voltage transformer substation is bad, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), the remote SF6 gas density relay consists of a mechanical density relay and an electronic remote transmission part; in addition, in the power grid system using the gas density transmitter, the traditional mechanical density relay is reserved. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and when the pressure reaches the alarm, locking or overpressure state, information is transmitted to a target equipment terminal through a contact connection circuit in time, 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, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be timely transmitted to target equipment (such as a computer terminal) to realize online monitoring.
The periodic inspection of the gas density relay on the SF6 electrical equipment is a necessary measure for preventing the gas density relay from happening and ensuring the safe and reliable operation of the SF6 electrical equipment; both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, 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 verification of the SF6 gas density relay is very important and popular in the power system at present, and various power supply companies, power plants and large factories and mines enterprises have been implemented. And power supply companies, power plants and large-scale factories and mining enterprises are required to be equipped with testers, equipment vehicles and SF6 gas with high value for completing the on-site verification and detection work of the gas density relay. The method comprises the steps of roughly calculating the power failure business loss during detection, wherein the annual allocated detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the field check of the inspector is not in normal operation, potential safety hazards exist. Therefore, innovation is very necessary on the existing gas density relay, so that the gas density relay or a monitoring system formed by the gas density relay for realizing on-line monitoring of the gas density is also provided with the verification function of the gas density relay, and further the periodic verification work of the (mechanical) gas density relay is finished, maintenance personnel are not required to go to the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro water value inside the air chamber of the electrical equipment can be accurately measured in the on-line self-checking gas density relay or a monitoring system consisting of the gas density relay.
Disclosure of Invention
The invention aims to provide a transmitter applied to high-voltage and medium-voltage electrical equipment and used for checking a density relay on line, and a realization method and a system thereof, which are used for monitoring the gas density of gas-insulated or arc-extinguishing electrical equipment, and simultaneously completing on-line checking of the gas density relay, thereby improving the efficiency, reducing the operation and maintenance cost and guaranteeing the safe operation of a power grid.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a first aspect of the application provides a transmitter for an on-line check density relay.
A second aspect of the present application provides a monitoring system comprising or including the transmitter for an on-line check density relay of the first aspect.
The application relates to a transmitter for an on-line check density relay, which comprises: the intelligent control device comprises a shell, and a pressure sensor, a temperature sensor, a communication module, an intelligent control unit and an equipment connecting joint which are arranged in the shell, wherein the transmitter is communicated with electrical equipment and a gas density relay through the equipment connecting joint; the transmitter also comprises a valve, a pressure regulating mechanism and an on-line check joint signal sampling unit; wherein,
One end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the gas circuit of the gas density relay and the pressure sensor;
The pressure regulating mechanism is communicated with the gas path of the gas density relay and the gas path of the pressure sensor, and is configured to regulate the pressure rise and fall of the gas path of the gas density relay so as to enable the gas density relay to generate contact action;
the pressure sensor is communicated with the gas density relay on a gas path;
The on-line checking contact signal sampling unit is respectively connected with the signal generator of the gas density relay and the intelligent control unit, and is used for sampling contact signals generated when the gas density relay is in contact action and transmitting the contact signals to the intelligent control unit;
the intelligent control unit is also respectively connected with the valve, the pressure regulating mechanism, the pressure sensor, the temperature sensor and the communication module, and is used for converting data acquired by the pressure sensor and the temperature sensor into standard signals, controlling the valve to be closed or opened, completing the control of the pressure regulating mechanism, receiving a pressure value and a temperature value and/or a gas density value when a contact point of the gas density relay acts, and remotely transmitting the pressure value and the temperature value and/or the gas density value to a corresponding detection system or target equipment through the communication module;
Wherein the contact signal includes an alarm, and/or a latch.
Preferably, the signal generator comprises a micro switch or a magnetically assisted electrical contact, and the gas density relay outputs a contact signal through the signal generator.
Preferably, the intelligent control unit converts the data acquired by the pressure sensor and the temperature sensor into a gas density value (namely, a pressure value at 20 ℃); or converted into a digital signal of a gas density value (namely, a pressure value corresponding to 20 ℃), and the on-line monitoring of the gas density is completed.
More preferably, the intelligent control unit calculates the gas density value by using a mean method (average method), the mean method being: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or alternatively
In a set time interval and a set temperature interval step length, carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain gas density values; or in a set time interval, setting a pressure interval step length, and carrying out average value calculation on density values corresponding to N different pressure values acquired in all pressure change ranges to obtain gas density values;
Wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent control unit converts the data acquired by the pressure sensor and the temperature sensor into current signals corresponding to the density values.
More preferably, the current signal is a direct current signal.
Further, the direct current signal is 0-10 mA or 4-20 mA.
Preferably, the intelligent control unit converts the data collected by the pressure sensor and the temperature sensor into voltage signals with corresponding density values.
More preferably, the voltage signal is a direct current voltage signal.
Further, the direct-current voltage signal is 1-5V.
Preferably, the intelligent control unit is based on an embedded algorithm and a control program of the embedded system of the microprocessor, and automatically controls the whole verification process, including all peripherals, logic and input and output.
More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general purpose computer, an industrial personal computer, an ARM chip, an AI chip, CPU, MCU, FPGA, PLC, an industrial control main board, an embedded main control board and the like, and comprises all peripherals, logics and input and output.
Preferably, the intelligent control unit acquires a pressure value and a temperature value acquired by the pressure sensor and the temperature sensor when the gas density relay is in contact action, and converts the pressure value and the temperature value into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely a gas density value, so as to complete the online verification of the gas density relay.
Preferably, the transmitter automatically implements testing of an absolute pressure type gas density relay, and/or a relative pressure type gas density relay. Namely, the absolute pressure structure-absolute pressure display type density relay, the absolute pressure structure-gauge pressure display type density relay, the gauge pressure structure-absolute pressure display type density relay and the gauge pressure structure-gauge pressure display type density relay can be tested. In particular, the transmitter comprises a relative pressure sensor, and/or an absolute pressure sensor.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.
More preferably, the electrical interface is provided with an electrical interface protection circuit that prevents damage to the interface due to misconnection by a user, and/or prevents electromagnetic interference.
Preferably, the intelligent control unit is further provided with a clock, and the clock is used for periodically setting check time, recording test time or recording event time.
Preferably, the transmitter monitors the gas density value of the electrical equipment on line, and if abnormality exists, the transmitter starts on-line verification of the gas density relay.
Preferably, after the transmitter completes the verification of the gas density relay, the intelligent control unit automatically generates a verification report of the gas density relay, if an abnormality exists, the intelligent control unit automatically sends out an alarm, and/or uploads the alarm to a remote end, and/or sends the alarm to a designated receiver (for example, sends the alarm to a mobile phone).
Preferably, after the transmitter completes the verification of the gas density relay, if there is an abnormality, the intelligent control unit uploads the alarm contact signal of the gas density relay to a remote end and/or sends the alarm contact signal to a designated receiver (for example, to a mobile phone) through a communication module.
Preferably, the intelligent control unit comprises: microprocessor, human-computer interface, valve controller, pressure regulating mechanism position detection piece, execution controller (part).
Preferably, the valve is an electrically operated valve.
Preferably, the valve is a solenoid valve.
More preferably, the valve is a permanent magnet solenoid valve.
Preferably, the valve is a piezoelectric valve, a temperature-controlled valve or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
Preferably, the valve is closed or opened by bending or flattening the hose.
Preferably, the valve is sealed within a cavity or housing.
Preferably, the valve and the pressure regulating mechanism are sealed within a cavity or housing.
Preferably, the valve is closed, the pressure regulating mechanism is boosted, the load is increased, or the pressure regulating mechanism is depressurized, the load is reduced, and the change speed of the load is no more than 10 per mill of the measuring range of the gas density relay per second.
Preferably, pressure sensors are respectively arranged on two sides of the gas path of the valve; or pressure or density detectors are respectively arranged on two sides of the gas path of the valve.
Preferably, the front end of the valve is provided with a density relay or a density switch, outputting a signal of a safety check set point, which is connected with the intelligent control unit.
Preferably, the gas density relay is disposed on or within a housing of the transmitter.
Preferably, the temperature sensor is disposed on or within a housing of the gas density relay; or on or within the housing of the transmitter.
Preferably, at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of the gas density relay, said temperature compensation element using a temperature compensation plate or a gas enclosed in the housing. Preferably, at least one temperature sensor is provided at an end of a pressure detector of the gas density relay close to the temperature compensation element, the pressure detector comprising a barden tube or a bellows.
Preferably, the pressure sensor and the temperature sensor are of an integrated structure; or the integrated structure formed by the pressure sensor and the temperature sensor has a remote transmission function, and remotely transmits the monitored pressure value, the monitored temperature value and/or the gas density value and/or the joint signal of the remote transmission gas density relay.
Preferably, the transmitter comprises at least two pressure sensors, the pressure values acquired by the pressure sensors are compared, and mutual verification among the pressure sensors is completed.
Preferably, the transmitter comprises at least two temperature sensors, the temperature values acquired by the temperature sensors are compared, and mutual verification among the temperature sensors is completed.
Preferably, the transmitter comprises at least one pressure sensor and at least one temperature sensor; the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and each gas density value is compared to finish the mutual verification of each pressure sensor and each temperature sensor; or comparing the gas density values obtained by the pressure sensors and the temperature sensors with the comparison density value output signals output by the gas density relay to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.
Preferably, the transmitter is provided with a comparison density value output signal which is connected with the intelligent control unit; or the transmitter is provided with a comparison pressure value output signal which is connected with the intelligent control unit.
Preferably, the pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is caused by heating the heating element and/or refrigerating the refrigerating element, so that the pressure rise and fall of the gas density relay are completed.
More preferably, the heating element, and/or the cooling element is a semiconductor.
More preferably, the pressure regulating mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the closed air chamber.
Preferably, in verification, the pressure regulating mechanism is a cavity with one end open, and the other end of the cavity is communicated with a gas path of the gas density relay; the cavity is internally provided with a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod to drive the piston to move in the cavity.
Preferably, in the verification process, the pressure regulating mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving component is arranged outside the closed air chamber, and the driving component pushes the piston to move in the closed air chamber through electromagnetic force.
Preferably, the pressure regulating mechanism is an air bag with one end connected with the driving component, and the air bag is subjected to volume change under the driving of the driving component.
Preferably, the pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay, and the other end of the corrugated pipe stretches and contracts under the drive of the driving component.
The driving component in the pressure regulating mechanism includes, but is not limited to, one of magnetic force, motor (variable frequency motor or stepping motor), reciprocating mechanism, carnot circulation mechanism, and pneumatic element.
Preferably, the pressure regulating mechanism is a bleed valve.
More preferably, the pressure regulating mechanism further comprises a flow valve controlling the flow rate of the gas release.
More preferably, the bleed valve is a solenoid valve or an electrically operated valve, or other bleed valve implemented by electrical or pneumatic means.
More preferably, the air release valve is used for placing air to a zero position, the intelligent control unit is used for collecting the pressure value at the time, comparing, completing zero position verification of the pressure sensor, judging a comparison result, and sending an abnormal prompt if the error is out of tolerance: pressure sensors have problems.
Preferably, the pressure regulating mechanism is a compressor.
Preferably, the pressure regulating mechanism is a pump including, but not limited to, a pump, booster pump, electric air pump, or electromagnetic air pump.
Preferably, the pressure regulating mechanism is sealed within a cavity or housing.
Preferably, the on-line checking contact signal sampling unit is provided with at least two independent sampling contacts, so that the checking of at least two contacts of the gas density relay can be automatically completed at the same time, and the contacts are continuously measured without changing the contacts or reselecting the contacts; wherein,
The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a lockout 1 contact + a lockout 2 contact, an alarm contact + a lockout contact + an overpressure contact.
Preferably, the on-line checking contact signal sampling unit applies a voltage of not less than 24V to the contact action value or the switching value (the gas density value when the contact switches to the open-close state) of the gas density relay, that is, applies a voltage of not less than 24V between the corresponding terminals of the contact during checking.
Preferably, the on-line check joint signal sampling unit and the intelligent control unit are arranged in a shell of the transmitter.
Preferably, the on-line check contact signal sampling unit and the intelligent control unit are arranged together.
More preferably, the on-line check contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the on-line check contact signal sampling unit comprises a first connection circuit and a second connection circuit; the first connecting circuit is connected with the contact point of the gas density relay and the contact point signal control loop, and the second connecting circuit is connected with the contact point of the gas density relay and the intelligent control unit;
In a non-verification state, the contact is a normally open type density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact point of the gas density relay is connected with the intelligent control unit; or alternatively
In a non-verification state, the contact is a normally-closed density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in the verification state, the contact signal control loop is closed, the contact of the gas density relay is disconnected from the contact signal control loop, and the second connection circuit is communicated to connect the contact of the gas density relay with the intelligent control unit.
More preferably, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally-closed contact, the second relay is provided with at least one normally-open contact, and the normally-closed contact and the normally-open contact keep opposite switch states; the normally-closed contact is connected in series in the contact signal control loop, and the normally-open contact is connected to the contact of the gas density relay;
in a non-verification state, the normally-closed contact is closed, the normally-open contact is opened, and the gas density relay monitors the output state of the contact in real time; in the verification state, the normally-closed contact is opened, the normally-open contact is closed, and the contact of the gas density relay is connected with the intelligent control unit through the normally-open contact.
Further, the first relay and the second relay are two independent relays or the same relay.
Preferably, the connection point of the on-line checking connection point signal sampling unit and the gas density relay is isolated by photoelectricity on a circuit.
Preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
More preferably, the wired communication mode includes one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier and a cable.
More preferably, the wireless communication mode includes one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sonic, satellite, optical wave, quantum communication and sonar built in a sensor.
Preferably, the transmitter further comprises a multi-way joint, and the gas density relay, the valve and the pressure regulating mechanism are arranged on the multi-way joint.
More preferably, the valve is embedded on the multi-way joint.
More preferably, the transmitter further comprises a self-sealing valve mounted on the multi-way joint.
Preferably, the transmitter further comprises a micro water sensor, and the micro water sensor is connected with the intelligent control unit and used for monitoring the gas micro water value on line.
More preferably, the transmitter further comprises a gas circulation mechanism, the gas circulation mechanism is connected with the intelligent control unit, the gas circulation mechanism comprises a capillary tube, a sealed cavity and a heating element, and through the heating element, gas flow is achieved, and the gas micro water value is monitored on line. Preferably, the micro water sensor can be installed in a sealed chamber, a capillary tube, a capillary orifice or outside the capillary tube of the gas circulation mechanism.
Preferably, the transmitter further comprises a decomposition product sensor for on-line monitoring of gas decomposition products, and the decomposition product sensor is connected with the intelligent control unit.
Preferably, the transmitter further comprises a gas density relay comprising a digital or liquid crystal display device having an indication display.
Preferably, the valve and the pressure regulating mechanism are connected together by a connecting pipe.
Preferably, the pressure sensor, the temperature sensor, the on-line check joint signal sampling unit and the intelligent control unit are arranged in or on the shell of the gas density relay.
Preferably, the transmitter further comprises a power supply for supplying power to each electric equipment, wherein the power supply comprises a power supply circuit, a battery, a recyclable rechargeable battery, solar energy, a power supply obtained by taking power from a mutual inductor, or an induction power supply.
Preferably, the transmitter is periodically timed to check the gas density relay on-line.
Preferably, when the gas density value, or the pressure value, is below a set point, the transmitter automatically does not verify and signals a notification.
Preferably, the transmitter is further provided with a temperature protection device for the electronic components, and the temperature protection device is used for ensuring that the electronic components reliably work at low temperature or high temperature environment temperature.
More preferably, the temperature protection device comprises a heater and/or a heat sink (e.g. a fan), the heater being turned on when the temperature is below a set point and the heat sink (e.g. a fan) being turned on when the temperature is above the set point.
Preferably, the transmitter further comprises an analysis system (e.g., expert management analysis system) for monitoring the gas density values, electrical performance of the gas density relay, and detecting, analyzing and determining the monitoring elements.
Preferably, the transmitter further comprises a display interface for human-machine interaction, displaying current data in real time, and/or supporting data input. Specifically, the method comprises real-time online gas density value display, pressure value display, temperature display, change trend analysis, historical data query, real-time alarm and the like.
Preferably, the error judgment requirements of the gas density relay are the same or different when the transmitter is used for verifying the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃. In particular, it can be implemented according to the relevant standards, according to the temperature requirements.
Preferably, the transmitter compares the error performance of the gas density relay at different temperatures and for different periods of time. Namely, in different periods and in the same temperature range, the performance of the gas density relay is judged; the comparison of each period of the history and the comparison of the history and the current.
Preferably, the transmitter has a self-diagnosis function, and can timely notify of abnormality. Such as wire breaks, short circuit alarms, sensor damage, gas pressure trends, etc.
Preferably, the transmitter further comprises a camera for monitoring.
Preferably, the transmitter further comprises a shielding member capable of shielding an electric field and/or a magnetic field, and the shielding member is arranged inside or outside a shell of the transmitter; or alternatively
The shielding piece is arranged on the intelligent control unit and/or the communication module; or alternatively
The shield is disposed on the pressure sensor.
Preferably, the transmitter displays the gas density value and the verification result in situ and/or by a remote background detection system.
Preferably, at least two transmitters are connected with the remote background detection system sequentially through a hub and a protocol converter.
More preferably, the hub is an RS485 hub.
More preferably, the protocol converter employs an IEC61850 or IEC104 protocol converter.
More preferably, the protocol converter is further connected to a network service printer and a network data router, respectively.
Preferably, the control of the intelligent control unit of the transmitter is controlled by field control and/or by a remote background detection system.
More preferably, the intelligent control unit completes the on-line verification of the gas density relay according to the setting of the remote background detection system or a remote control instruction; or the on-line verification of the gas density relay is completed according to the verification time of the set gas density relay.
Preferably, the intelligent control unit is provided with a connecting end for connecting a comparison density value output signal or a comparison pressure value output signal of the gas density relay.
More preferably, when the gas density relay outputs a comparison density value output signal, the intelligent control unit collects the current gas density value, performs comparison, and completes the comparison density value verification of the gas density relay, the intelligent control unit or/and the remote background detection system judges comparison results, and if the errors are out of tolerance, an abnormality prompt is sent; or alternatively
When the gas density relay outputs a comparison density value output signal, the intelligent control unit collects the current gas density value, performs comparison, completes mutual verification of the gas density relay, the temperature sensor and the pressure sensor, judges comparison results by the intelligent control unit or/and a remote background detection system, and sends out an abnormality prompt if the errors are out of tolerance; or alternatively
When the gas density relay outputs a comparison pressure value output signal, the intelligent control unit collects the current pressure value, performs comparison, completes mutual verification of the gas density relay, the temperature sensor and the pressure sensor, judges comparison results of the intelligent control unit or/and the remote background detection system, and sends out an abnormal prompt if the errors are out of tolerance.
The third aspect of the present invention provides a method for implementing a transmitter for an on-line check density relay, comprising:
During normal operation, a transmitter for an on-line check density relay monitors the gas density in the electrical equipment, and simultaneously the transmitter remotely transmits the monitored pressure value, temperature value and/or gas density value in the electrical equipment through a pressure sensor, a temperature sensor and an intelligent control unit;
the transmitter is according to the check time and/or check command that set for, and the gas density value condition, under the condition that allows checking gas density relay:
The pressure regulating mechanism is regulated to an initial state of verification through the intelligent control unit (the next step can be directly carried out without going through the step);
closing the valve by an intelligent control unit;
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay to connect a contact of the gas density relay to the intelligent control unit;
the intelligent control unit drives the pressure regulating mechanism to slowly reduce the gas pressure so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during the contact action, and the checking work of the contact action value of the gas density relay is completed by detecting the contact action value (the gas density value during the contact action) of the gas density relay;
After all the verification works are completed, the intelligent control unit opens the valve, and adjusts the on-line verification contact signal sampling unit to a working state, and the contact signal control loop of the gas density relay resumes to operate in a normal working state.
Preferably, the implementation method of the transmitter for the on-line check density relay further comprises the following steps:
After the transmitter finishes the verification work of the contact action value of the gas density relay, and before the valve is opened, the intelligent control unit drives the pressure regulating mechanism through the intelligent control unit to slowly increase the gas pressure, so that the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line verification contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value when the contact is reset, and the gas density value is detected, so that the verification work of the contact return value of the gas density relay (the gas density value when the contact is reset) is finished.
Preferably, after the transmitter completes the verification of the gas density relay, if there is an abnormality, the transmitter automatically sends an alarm and/or uploads to a remote location and/or sends to a designated receiver (e.g., to a cell phone).
Preferably, after the transmitter completes the verification of the gas density relay, if there is an abnormality, the intelligent control unit uploads the alarm contact signal of the gas density relay to a remote end and/or sends the alarm contact signal to a designated receiver (for example, to a mobile phone) through a communication module
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1) The transmitter for the on-line check density relay comprises a shell, and a pressure sensor, a temperature sensor, a communication module, an intelligent control unit and an equipment connecting joint which are arranged in the shell, wherein the transmitter is communicated with electrical equipment and a gas density relay through the equipment connecting joint; the transmitter also comprises a valve, a pressure regulating mechanism and an on-line check joint signal sampling unit. The transmitter controls the pressure lifting of the pressure regulating mechanism through the intelligent control unit, so that the gas density relay is subjected to contact action, the intelligent control unit detects the contact action value and/or the return value of the gas density relay according to the density value during contact action, remote transmission is realized through the communication module, verification of the gas density relay is completed, maintenance personnel is not required to go to the site to operate, and maintenance-free electrical equipment is realized. The transmitter has compact and reasonable layout, is easy to operate in connection and disassembly of all parts, improves the reliability of a power grid, improves the working efficiency and reduces the cost.
2) A monitoring system is provided that includes the above-described transmitter.
3) The realization method of the transmitter for the on-line check density relay can support the normal operation of the transmitter.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a transmitter for an on-line check density relay according to a first embodiment;
FIG. 2 is a schematic diagram of a control circuit of a transmitter for an on-line check density relay of embodiment two;
FIG. 3 is a schematic diagram of a transmitter for an on-line check density relay of embodiment three;
FIG. 4 is a schematic diagram of a transmitter for an on-line check density relay of embodiment four;
FIG. 5 is a schematic diagram of a transmitter for an on-line check density relay of embodiment five;
FIG. 6 is a schematic diagram of a transmitter for an on-line check density relay of embodiment six;
FIG. 7 is a schematic diagram of a transmitter for an on-line check density relay of embodiment seven;
FIG. 8 is a schematic diagram of a transmitter for an on-line check density relay of embodiment eight;
FIG. 9 is a schematic diagram of a transmitter for an on-line check density relay of embodiment nine;
FIG. 10 is a schematic diagram of a transmitter for an on-line check density relay of embodiment ten;
FIG. 11 is a schematic diagram of a transmitter for an on-line check density relay of embodiment eleven;
FIG. 12 is a schematic diagram of a transmitter for an on-line check density relay of embodiment twelve;
FIG. 13 is a schematic diagram of a control circuit of the thirteenth embodiment;
FIG. 14 is a schematic diagram of a control circuit of a fourteenth embodiment;
FIG. 15 is a schematic diagram of a control circuit of fifteen embodiments;
FIG. 16 is a schematic diagram of a control circuit of a sixteenth embodiment;
FIG. 17 is a schematic diagram of a control circuit of seventeenth embodiment;
FIG. 18 is a schematic diagram of a control circuit according to an eighteenth embodiment;
Fig. 19 is a schematic diagram of a control circuit of nineteenth embodiment;
FIG. 20 is a schematic circuit diagram of a 4-20mA density transmitter;
FIG. 21 is a schematic diagram of a transmitter for an on-line check density relay of twenty-first embodiment;
FIG. 22 is a schematic diagram of a monitoring system according to twenty-second embodiment;
FIG. 23 is a schematic diagram of a monitoring system according to twenty-third embodiment;
Fig. 24 is a schematic architecture diagram of a monitoring system according to twenty-fourth embodiment.
Detailed Description
The invention provides a transmitter for an on-line check density relay, and a realization method and a system thereof, and in order to make the purposes, the technical scheme and the effects of the invention clearer and more definite, the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
FIG. 1 is a schematic diagram of a transmitter for an on-line check density relay. As shown in fig. 1, includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9 and an air supplementing interface 10. The transmitter is communicated with the electrical equipment and the gas density relay 1 through the equipment connecting joint. The gas density relay 1, the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supplementing interface 10 are arranged on the multi-way joint 9. Specifically, the air inlet of the valve 4 is provided with an interface communicated with electrical equipment, the air inlet of the valve is connected to the electrical equipment in a sealing way and is communicated with an air chamber of the electrical equipment, and the air outlet of the valve 4 is communicated with the gas density relay 1 through a multi-way joint 9; the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path through a multi-way joint 9; the pressure regulating mechanism 5 is communicated with the gas density relay 1 through a multi-way joint 9; the on-line checking contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent control unit 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7; the air supplementing interface 10 is communicated with the multi-way joint 9.
Wherein, gas density relay 1 includes: a bimetal-compensated gas density relay, a gas-compensated gas density relay, or a bimetal and gas-compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; density relay with indication (density relay with pointer display, or density relay with digital display, density relay with liquid crystal display), density relay without indication (i.e. density switch); SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relay, and the like.
Type of pressure sensor 2: the absolute pressure sensor, the relative pressure sensor, or the absolute pressure sensor and the relative pressure sensor 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 type pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Bardon tube), and a resistance pressure sensor (such as a pressure measurement sensor with a sliding wire resistance attached to a Bardon tube), and can be an analog quantity pressure sensor or a digital quantity pressure sensor. The pressure acquisition is a pressure sensor, a pressure transducer, or other various pressure sensing elements, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistive strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: thermocouple, thermistor, semiconductor type; both contact and non-contact; and may be a thermal resistor and a thermocouple. In short, various temperature sensing elements such as a temperature sensor and a temperature transmitter can be used for temperature acquisition.
The control of the valve 4 can adopt various transmission modes, such as manual operation, electric operation, hydraulic operation, pneumatic operation, turbine operation, electromagnetic hydraulic operation, electro-hydraulic operation, pneumatic operation, spur gear, bevel gear drive and the like; the valve can be operated according to preset requirements 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 enable the opening and closing piece to do lifting, sliding, swinging or rotating movement by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve is changed to realize the control function of the valve. The valves 4 may be of the automatic valve type, the power driven valve type and the manual valve type in a driving manner. 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) drive. The valve 4 may be automatic or manual or semi-automatic. The verification process can be automatically completed or semi-automatically completed by manual cooperation. The valve 4 is directly or indirectly connected with the electrical equipment through a self-sealing valve, a manual valve or a non-dismantling valve, and is integrated or separated. The valve 4 may be of a normally open type, a normally closed type, a unidirectional type, or a bidirectional type, as required. In short, the gas circuit is opened or closed by the electric control valve. The electric control valve adopts the following modes: solenoid valves, electrically controlled ball valves, electrically controlled proportional valves, and the like.
The pressure regulating mechanism 5 of this embodiment is one end open-ended cavity, there is the piston 51 in the cavity, the piston 51 is equipped with sealing washer 510, the one end of piston 51 is connected with a regulation pole, the outer end of regulation pole is connected with drive part 52, the other end of piston 51 stretches into in the opening, and with the inner wall of cavity contacts, drive part 52 drive the regulation pole and then drive piston 51 removes in the cavity. The drive component 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a reciprocating mechanism, a Carnot cycle mechanism, a pneumatic element.
The basic requirements or functions of the intelligent control unit 7 are: control of the valve 4, control of the pressure regulating mechanism 5 and signal acquisition are accomplished by means of the intelligent control unit 7. The realization is as follows: the pressure value and the temperature value when the contact signal of the gas density relay 1 acts can be detected and converted into the corresponding pressure value P 20 (density value) at 20 ℃, namely the contact action value P D20 of the gas density relay 1 can be detected, and the verification work of the gas density relay 1 is completed. Or the density value P D20 when the contact signal of the gas density relay 1 acts can be directly detected, and the verification work of the gas density relay 1 is completed.
Of course, the intelligent control unit 7 may also implement: completing test data storage; and/or test data derivation; and/or the test data is printable; and/or can carry out data communication with an upper computer; and/or analog quantity, digital quantity information may be entered. The intelligent control unit 7 further comprises a communication module, and the communication module is used for realizing remote transmission of information such as test data and/or verification results; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the rated pressure value verification of the gas density relay 1 is completed.
Electrical equipment, including SF6 gas electrical equipment, SF6 gas mixture electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment. Specifically, the electrical devices include GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas tanks, ring main units, and the like.
The transmitter has the functions of pressure and temperature measurement and software conversion. The alarm and/or locking contact action value and/or return value of the gas density relay 1 can be detected on line on the premise of not affecting the safe operation of the electrical equipment. Of course, the return value of the alarm and/or lockout contact signals may also be tested as desired.
Embodiment two:
FIG. 2 is a schematic diagram of a control circuit for a transmitter for an on-line check density relay. As shown in fig. 2, the on-line checking contact signal sampling unit 6 of the present embodiment is provided with a protection circuit, and includes a first connection circuit and a second connection circuit, where the first connection circuit connects the contact of the gas density relay 1 with the contact signal control circuit, the second connection circuit connects the contact of the gas density relay 1 with the intelligent control unit 7, and in a non-checking state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit 6 cuts off the first connection circuit, communicates with the second connection circuit, and connects the contact of the gas density relay 1 with the intelligent control unit 7.
Specifically, the first connection circuit includes a first relay J1, and the second connection circuit includes a second relay J2. The first relay J1 is provided with normally closed joints J11 and J12, and the normally closed joints J11 and J12 are connected in series in the joint signal control loop; the second relay J2 is provided with normally open joints J21 and J22, and the normally open joints J21 and J22 are connected to a joint P J of the gas density relay 1; the first relay J1 and the second relay J2 may be integrated, that is, a relay having normally open and normally closed contacts. In a non-verification state, the normally-closed joints J11 and J12 are closed, the normally-open joints J21 and J22 are opened, and the gas density relay monitors the output state of the joint P J in real time; in the verification state, the normally closed junctions J11 and J12 are opened, the normally open junctions J21 and J22 are closed, and the junction P J of the gas density relay 1 is connected with the intelligent control unit 7 through the normally open junctions J21 and J22.
The intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) may be a general purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, MCU, FPGA, PLC, etc., an industrial motherboard, an embedded main control board, etc., and other intelligent integrated circuits. The power source 72 (U2) may be a switching power supply, an ac 220V, a dc power supply, an LDO, a programmable power supply, solar power, a secondary battery, a rechargeable battery, a battery, or the like. The pressure sensor 2 for the pressure acquisition P may be: pressure sensors, pressure transmitters, and other pressure sensing elements. The temperature sensor 3 for temperature acquisition T may be: temperature sensor, temperature transmitter, etc. The valve 4 may be: solenoid valves, electrically operated valves, pneumatic valves, ball valves, needle valves, regulating valves, shutters, etc. can open and close the air path, even the flow control elements. Semi-automatic may also be a manual valve. The pressure regulating mechanism 5 may be: an electric regulating piston, an electric regulating cylinder, a booster pump, a gas cylinder for pressurization, a valve, an electromagnetic valve, a flow controller and the like. The pressure adjustment mechanism may also be semi-automatic or manually adjustable.
The working principle of the first embodiment is as follows:
The intelligent control unit 7 monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P 20 (namely a gas density value). When the gas density relay 1 needs to be checked, if the gas density value P 20 is more than or equal to the set safety check density value P S, the intelligent control unit 7 controls the valve 4 to be closed, so that the gas density relay 1 is isolated from electrical equipment on a gas path.
Then, the intelligent control unit 7 controls to disconnect the contact signal control loop of the gas density relay 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the on-line checking contact signal sampling unit 6 are disconnected, so that the safety operation of the electrical equipment is not affected when the gas density relay 1 is checked on line, and an alarm signal is not sent out by mistake or the control loop is locked when the gas density relay 1 is checked on line. Because the monitoring and judgment of the safety check density value P S set at or above the gas density value P 20 is already performed before the start of the check, the gas leakage of the electrical equipment is a slow process within the safety operation range, and the check is safe. Meanwhile, the normally open contacts J21 and J22 of the second relay J2 of the on-line checking contact signal sampling unit 6 are closed, and at the moment, the contact P J of the gas density relay 1 is connected with the intelligent control unit 7 through the normally open contacts J21 and J22 of the second relay J2.
Then, the intelligent control unit 7 controls the driving part 52 (which can be mainly realized by adopting a motor and a gear, and the mode is various and flexible) of the pressure regulating mechanism 5, so that the volume change of the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually reduced, the gas density relay 1 generates a contact signal action, the contact signal action is uploaded to the intelligent control unit 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the measured pressure value P and the temperature T value into a pressure value P 20 (density value) corresponding to 20 ℃ according to the gas characteristic, and then the contact action value P D20 of the gas density relay can be detected. After all the contact signal action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 5, the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay 1 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay is completed.
After the verification is completed, the normally open contacts J21 and J22 of the second relay J2 of the on-line verification contact signal sampling unit 6 are disconnected, and at this time, the contact P J of the gas density relay 1 is disconnected from the intelligent control unit 7 by disconnecting the normally open contacts J21 and J22 of the second relay J2. The intelligent control unit 7 controls the valve 4 to be opened so that the gas density relay 1 is communicated with the electrical equipment on the gas path. Then, normally closed contacts J11 and J12 of a first relay J1 of the on-line checking contact signal sampling unit 6 are closed, a contact signal control loop of the gas density relay 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Thus, the on-line checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.
When the transmitter finishes the verification work, the transmitter judges and can report the detection result. The mode is flexible, and specifically can: 1) The display can be performed on site, for example, by an indicator light, a digital code, a liquid crystal or the like; 2) Or uploading is implemented in an online remote communication mode, for example, the method can be uploaded to a background monitoring terminal; 3) Or uploading to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) Or uploaded by another route; 5) Or uploading the abnormal result through an alarm signal line or a special signal line; 6) Alone or in combination with other signal bundles. In short, after the transmitter completes the online checking work of the gas density relay 1, if the gas density relay is abnormal, an alarm can be automatically sent out, and the gas density relay can be uploaded to a far end or can be sent to a designated receiver, such as a mobile phone. Or after the verification work is finished, if the verification work is abnormal, the intelligent control unit 7 can upload remote ends (a monitoring room, a background monitoring platform and the like) through alarm contact signals of the gas density relay 1, and can also display notices on site. And the simple online verification can upload the result with the abnormality in verification through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with the alarm signal contact, and the alarm signal contact is regularly closed and opened, so that the situation can be obtained through analysis; or uploaded through a separate verification signal line. The method can be used for uploading states well or problems, uploading the verification result through a single verification signal line, displaying the verification result on site, alarming the verification result on site or uploading the verification result through wireless uploading, and uploading the verification result on a network with a smart phone. The communication mode is wired or wireless, and the wired communication mode CAN be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, hart, IIC, SPI, wire, coaxial cable, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module (such as NB-IOT) built in a sensor, and the like. In a word, can be multiple mode, multiple combination fully guarantees the reliable performance of changer.
The transmitter has a safety protection function, namely when the value is lower than a set value, the transmitter automatically does not perform on-line verification on the gas density relay 1 any more and sends out a notification signal. For example, when it is detected that the gas density value is smaller than the set value P S, the verification is not performed; only when the gas density value is more than or equal to (alarm pressure value +0.02MPa), the on-line verification can be performed.
The transmitter can perform online verification according to set time, and also can perform online verification according to set temperature (such as limit high temperature, limit low temperature, normal temperature, 20 ℃ and the like). When the high temperature, low temperature, normal temperature and 20 ℃ environment temperature are checked online, the error judgment requirements are different, for example, when the 20 ℃ environment temperature is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and the accuracy requirement can be 2.5 level at high temperature. And can be implemented according to the related standard according to the temperature requirement. For example, according to the specification of 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the precision requirement corresponding to each temperature value is required.
The transmitter is able to compare its error performance for different periods of time at different temperatures depending on the gas density relay 1. That is, the comparison in the same temperature range at different times determines the performance of the gas density relay 1 and the electrical equipment, and the comparison in each time of the history and the comparison in the history with the present are performed.
The transmitter may be repeatedly checked a number of times (e.g., 2-3 times) and based on the result of each check, an average value is calculated. If necessary, the gas density relay 1 can be checked online at any time.
When the transmitter finishes the verification of the gas density relay, mutual comparison judgment can be automatically carried out, and if the error phase difference is large, an abnormal prompt can be sent out: gas density relays or pressure sensors and temperature sensors have problems. Namely, the transmitter can complete the mutual calibration function of the gas density relay and the pressure sensor, the temperature sensor or the density transmitter, and has the artificial intelligent calibration capability; after the verification work is finished, a verification report 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 designated receiver, for example, a mobile phone; the gas density value and the verification result are displayed on site, or the gas density value and the verification result are displayed through a background, so that the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data inquiry, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the system has a self-diagnosis function, and can timely notify abnormality, such as disconnection, short-circuit alarm, sensor damage and the like; the comparison of the error performance of the gas density relay can be made according to different time periods at different temperatures. That is, the performance of the gas density relay is determined by comparison in the same temperature range at different periods. The comparison of each period of the history and the comparison of the history and the current. The gas density value, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 of the electrical equipment can be judged, analyzed and compared normally and abnormally; the system also comprises an analysis system (expert management analysis system) for detecting, analyzing and judging the gas density value, the gas density relay and the monitoring element and knowing where the problem point is; the contact signal state of the gas density relay 1 is also monitored, and the state is remotely transmitted. The state of the contact signal of the gas density relay 1 can be known to be open or closed in the background, so that one more layer of monitoring is performed, and the reliability is improved; the temperature compensation performance of the gas density relay 1 can be detected or detected and judged; the contact resistance of the contact point of the gas density relay 1 can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.
As long as the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the gas density relay can be indicated to be normal, thus the gas density relay can be not required to be checked, other devices can not be checked, and the whole service life can be free from checking. Unless the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electrical device in the transformer substation are inconsistent and abnormal, maintenance personnel are not scheduled to process. And for the anastomotic and normal conditions, the verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.
Embodiment III:
As shown in fig. 3, a transmitter for an on-line check density relay includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7.
The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint 1010, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on or in the shell of the gas density relay 1, and the pressure sensor 2 is communicated with the pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent unit 7.
The pressure is regulated by the pressure regulating mechanism 5, so that the signal generator of the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the gas density value when the gas density relay 1 generates contact action into a corresponding gas density value according to the pressure value and the temperature value, and the alarming and/or locking contact signal action value and/or return value of the gas density relay are detected, so that the checking work of the gas density relay is completed. Or only detecting the alarm and/or locking contact action value to complete the checking work of the gas density relay.
Embodiment four:
As shown in fig. 4, the third embodiment of the present invention is added with the air supply port 10 and the self-sealing valve 11. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing way, and the other end of the self-sealing valve 11 is communicated with the air inlet of the valve 4 and the air supplementing connector 10 through a connecting pipe.
Fifth embodiment:
As shown in fig. 5, a transmitter for an on-line check density relay includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1, the pressure sensor 2 and the pressure regulating mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are arranged at the rear side of the shell of the gas density relay 1. The on-line checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electric equipment connecting joint. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path through a base of the gas density relay 1; the pressure regulating mechanism 5 communicates with the pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7. Unlike the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are provided at the rear side of the housing of the gas density relay 1.
Example six:
As shown in fig. 6, a transmitter for an on-line check density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is communicated with a connecting pipe, the connecting pipe is communicated with a pressure detector of the gas density relay 1, and the pressure sensor 2 and the pressure regulating mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the pressure detector are communicated on an air path. The gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged in a shell; the on-line checking 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 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
Embodiment seven:
As shown in fig. 7, a transmitter for an on-line check density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The gas density relay 1, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on the gas path; the pressure regulating mechanism 5 is in communication with the pressure detector of the gas density relay 1 on the gas path. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7.
In contrast to the first embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving member 52. The pressure adjusting mechanism 5 is controlled by the intelligent control unit 7, so that the driving part 52 pushes the air bag 53 to change the volume, and the pressure is lifted.
Example eight:
as shown in fig. 8, a transmitter for an on-line check density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7 and a multi-way joint 9. The air inlet of the valve 4 is connected to the equipment connecting joint in a sealing way, and the air outlet 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 a pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is arranged on the multi-way joint 9, and the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and are arranged on the multi-way joint 9; the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7.
The difference from the first embodiment is that: the pressure adjusting mechanism 5 of the present embodiment is mainly composed of a bellows 54, a driving member 52. The bellows 54 is connected with the pressure detector of the gas density relay 1 in a sealing way to form a reliable sealing cavity. The pressure regulating 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 the sealing cavity changes the volume, thereby completing the lifting of the pressure. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarm and/or the locking contact action value and/or the return value of the gas density relay 1 are detected, so that the checking work of the gas density relay 1 is completed.
Example nine:
As shown in fig. 9, a transmitter for an on-line check density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. 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 a pressure detector of the gas density relay 1 on a gas path. The pressure regulating mechanism 5 is in communication with a pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
In contrast to the first exemplary embodiment, the valve 4 is sealed inside the first housing 41, and the control cables of the valve 4 are led out via a first outlet seal 42 sealed to the first housing 41, which ensures that the valve 4 remains sealed and can be operated reliably for a long period of time. The pressure regulating mechanism 5 is sealed inside the second shell 55, and a control cable of the pressure regulating mechanism 5 is led out through a second lead-out wire sealing piece 56 sealed with the second shell 55, so that the pressure regulating mechanism 5 is designed to keep sealed, and can reliably work for a long time. The second housing 55 and the first housing 41 may be integrated.
Example ten:
As shown in fig. 10, a transmitter for on-line verification of a density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is connected with the pressure regulating mechanism 5, and the pressure sensor 2 is arranged on the pressure regulating mechanism 5. The temperature sensor 3, the on-line checking joint signal sampling unit 6, the intelligent control unit 7 and the gas density relay 1 are arranged on the pressure regulating mechanism 5. The pressure detector of the gas density relay 1, the pressure sensor 2, the pressure regulating mechanism 5 and the valve 4 are communicated on a gas path. The temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
Example eleven:
As shown in fig. 11, a transmitter for an on-line check density relay, comprising: the intelligent control system comprises a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure regulating mechanism 5. The gas density relay 1, the first temperature sensor 31, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and on the pressure regulating mechanism 5; the first pressure sensor 21 is provided on the pressure adjusting mechanism 5. The second pressure sensor 22 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection is connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on the gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected with the intelligent control unit 7; the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.
Unlike the first embodiment, the two pressure sensors are respectively a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The second temperature sensor 32 may be omitted in this embodiment. The embodiment is provided with a plurality of pressure sensors and temperature sensors, and the pressure values obtained by monitoring the pressure sensors can be compared and checked with each other; the temperature values obtained by the temperature sensors can be compared and checked with each other; the plurality of pressure sensors and the plurality of temperature sensors can be compared with each other and checked with each other to obtain a plurality of corresponding gas density values.
Embodiment twelve:
As shown in fig. 12, a transmitter for on-line verification of a density relay, comprising: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7 and a multi-way joint 9. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way, and the air outlet of the valve 4 is connected with a multi-way joint 9. The valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out through the first lead-out wire sealing member 42 sealed with the first housing 41, so that the design ensures that the valve 4 keeps sealed, and can reliably work for a long time. The gas density relay 1 is arranged on the multi-way joint 9; the pressure regulating mechanism 5 is mounted on a multi-way joint 9. The pressure sensor 2, the temperature sensor 3, the on-line checking joint 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 regulating mechanism 5 on the gas path. The valve 4, the pressure regulating mechanism 5, the pressure sensor 2 and the temperature sensor 3 are respectively connected with an intelligent control unit 7.
Unlike the first embodiment, the following is: the pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay 1. The pressure regulating mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, and a heat insulating member 59. The air chamber 57 is externally (or internally) provided with a heating element 58, which, by heating, causes a temperature change and thus a pressure rise or fall. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarming and/or locking contact action value and/or the return value of the gas density relay are detected, so that the checking work of the gas density relay is completed.
The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent control unit 7 controls the heating element 58 of the pressure regulating mechanism 5 to heat, and when the temperature difference between the temperature value T510 in the pressure regulating mechanism 5 and the temperature value T of the temperature sensor 3 reaches a set value, the valve 4 can be closed through the intelligent control unit 7, so that the gas density relay is separated from electrical equipment on a gas path; 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 gas density relay 1 generates alarm and/or locking contact points to act respectively, transmitting the contact point actions to the intelligent control unit 7 through the on-line checking contact point signal sampling unit 6, and detecting the alarm and/or locking contact point action value and/or return value of the gas density relay by the intelligent control unit 7 according to the density value when the alarm and/or locking contact points act, thereby completing the checking work of the gas density relay.
Embodiment thirteen:
As shown in fig. 13, the on-line check contact signal sampling unit 6 of the present embodiment includes a photo coupler OC1 and a resistor R1, where the photo coupler OC1 includes a light emitting diode and a phototransistor; the anode of the light emitting diode and the contact P J of the gas density relay 1 are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is used as an output end out6 of the on-line check joint signal sampling unit 6 to be connected with the intelligent control unit 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, the closed loop is electrified, the light emitting diode emits light, the light turns on the phototransistor, and the collector electrode of the phototransistor outputs a low level; when the contact P J is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level. In this way, the high-low level is output through the output terminal out6 of the on-line check contact signal sampling unit 6.
In this embodiment, the intelligent control unit 7 is isolated from the contact signal control circuit by a photoelectric isolation method, and the contact P J is closed in the verification process, or the contact P J is closed under the condition of air leakage, and at this time, the low level of the collector output of the phototransistor is detected. The time for closing the contact P J during the verification process is controlled to be a preset length, so that the length of the duration of the closing state of the contact P J during the verification process is determined under the condition of no air leakage, and whether the contact P J is closed during the verification process can be judged by monitoring the duration of the received low level. Therefore, the time can be recorded during verification, and the alarm signal during verification, rather than the alarm signal during air leakage, can be judged by the air density relay 1.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2).
Fourteen examples:
as shown in fig. 14, the online check contact signal sampling unit 6 of the present embodiment includes a first photo coupler OC1 and a second photo coupler OC2.
The light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of the second photoelectric coupler OC2 are respectively connected in parallel through current limiting resistors, and are connected in series with the contact points of the gas density relay to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of the second photoelectric coupler OC2 are opposite; the collector of the phototriode of the first photoelectric coupler OC1 and the collector of the phototriode of the second photoelectric coupler OC2 are connected with a power supply through a voltage dividing resistor, the emitter of the phototriode of the first photoelectric coupler OC1 is connected with the emitter of the phototriode of the second photoelectric coupler OC2 to form an output end out6, and the output end out6 is connected with the intelligent control unit 7 and grounded through a resistor R5.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, the closed loop is electrified, the first photo coupler OC1 is turned on, the second photo coupler OC2 is turned off, and the emitter (i.e., the output end out 6) of the phototransistor of the first photo coupler OC1 outputs a high level; or the first photo-coupler OC1 is turned off, the second photo-coupler OC2 is turned on, and the emitter (i.e., the output terminal out 6) of the phototransistor of the second photo-coupler OC2 outputs a high level. When the contact P J is opened, the closed loop is disconnected, the first and second photo-couplers OC1 and OC2 are turned off, and the emitters (i.e., the output terminal out 6) of the phototransistors of the first and second photo-couplers OC1 and OC2 output a low level.
In a preferred embodiment, the circuit further comprises a first zener diode group and a second zener diode group, the first zener diode group and the second zener diode group are connected in parallel on the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.
In this embodiment, the first zener diode group includes a first zener diode D1 and a second zener diode D2 connected in series, and a cathode of the first zener diode D1 is connected to an anode of the second zener diode D2; the second zener diode group comprises a third zener diode D3 and a fourth zener diode D4 which are connected in series, and the positive electrode of the third zener diode D3 is connected with the negative electrode of the fourth zener diode D4.
The circuit can conveniently monitor the state of the contact P J of the gas density relay 1, and is combined with the intelligent control unit 7 to correspondingly process whether the contact P J is in an open state or in a closed state, remote transmission is implemented, the state of a contact signal is known from the background, and the reliability of a power grid is greatly improved.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2).
Example fifteen:
As shown in fig. 15, the present embodiment differs from the fourteenth embodiment in that: the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display 75 (U5), a data storage 76 (U6) and the like.
The communication mode of the communication module 73 (U3) may be wired, such as an industrial BUS including RS232, RS485, CAN-BUS, etc., an optical fiber ethernet, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier, etc.; or wireless, such as 2G/3G/4G/5G, etc., WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, sonar, etc. The intelligent control unit protection circuit 74 (U4) may be an anti-static interference circuit (e.g., ESD, EMI), an anti-surge circuit, an electrical fast protection circuit, an anti-rf field interference circuit, an anti-burst interference circuit, a power short protection circuit, a power reverse protection circuit, an electrical contact misconnection protection circuit, a charging protection circuit, etc. The intelligent control unit protection circuits can be one kind or a plurality of kinds of flexible combination. The display and output 75 (U5) may be a nixie tube, LED, LCD, HMI, a display, a matrix screen, a printer, a facsimile, a projector, a mobile phone, etc., and may be one kind or a combination of several kinds. The data storage 76 (U6) may be a flash memory card such as FLASH, RAM, ROM, a hard disk, SD, etc., a magnetic tape, a punched paper tape, an optical disk, a usb disk, a optical disk, a film, etc., and may be one kind or a combination of several kinds.
Example sixteen:
As shown in fig. 16, the online check contact signal sampling unit 6 of the present embodiment includes a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2, and a contact P J of the gas density relay are connected in series to form a closed loop, and a contact P J of the gas density relay 1 is connected between the first hall current sensor H1 and the second hall current sensor H2; the output end of the first Hall current sensor H1 and the output end of the second Hall current sensor H2 are connected with the intelligent control unit 7.
By the above circuit, it is possible to easily know whether the contact P J of the gas density relay 1 is open (non-operating state) or closed (operating state). Specifically, when the contact P J is closed, a closed loop is electrified, and a current flows between the first hall current-sensor H1 and the second hall current-sensor H2, so as to generate an induced potential; when the contact P J is opened, the closed loop is powered off, no current flows between the first hall current-sensor H1 and the second hall current-sensor H2, and the induced potential generated is zero.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output 75 (U5), a data storage 76 (U6), and the like.
Example seventeenth:
as shown in fig. 17, the on-line check contact signal sampling unit 6 of the present embodiment includes a first SCR1, a second SCR2, a third SCR3, and a fourth SCR4.
The first silicon controlled rectifier SCR1 is connected with the third silicon controlled rectifier SCR3 in series, and the second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR 3; one end of a contact P J of the gas density relay 1 is electrically connected with a circuit between the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR3 through a circuit, and the other end is electrically connected with the circuit
The second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 are electrically connected through a circuit. The series-parallel connection is a circuit in which the above-described components are connected in parallel and in series, as shown in fig. 6.
Specifically, the cathode of the first silicon controlled rectifier SCR1 is connected with the cathode of the second silicon controlled rectifier SCR2 to form the output end of the on-line checking contact signal sampling unit 6, and the output end is connected with the intelligent control unit 7; the anode of the first silicon controlled rectifier SCR1 is connected with the cathode of the third silicon controlled rectifier SCR 3; the anode of the second silicon controlled rectifier SCR2 is connected with the cathode of the fourth silicon controlled rectifier SCR 4; the anode of the third silicon controlled rectifier SCR3 and the anode of the fourth silicon controlled rectifier SCR4 are connected with the input end of the on-line check joint signal sampling unit 6. The control electrodes of the first silicon controlled rectifier SCR1, the second silicon controlled rectifier SCR2, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are all connected with the intelligent control unit 7. The intelligent control unit 7 can control the on or off of the corresponding silicon controlled rectifier.
The working procedure of this embodiment is as follows:
When the verification is not performed and the operation is normal, the contact P J is disconnected, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are triggered, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are in a conducting state, and the contact signal control loop is in a working state. At the moment, the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are not triggered, and the cathodes of the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are not subjected to voltage output and are in an off state. When verification is performed, the third SCR3 and the fourth SCR4 are not triggered, but the first SCR1 and the second SCR2 are triggered. At this time, the third SCR3 and the fourth SCR4 are in the off state, and the contact P J is isolated from the contact signal control loop. The first SCR1 and the second SCR2 are in a conductive state, and the contact P J is connected with the on-line verification contact signal sampling unit 6 and connected with the intelligent control unit 7. The on-line checking contact signal sampling unit 6 can also be formed by mixing a solid-state relay or an electromagnetic relay and a silicon controlled rectifier flexibly.
In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output 75 (U5), a data storage 76 (U6), and the like.
Example eighteenth:
As shown in fig. 18, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output and operation 75 (U5), a data storage 76 (U6), and the like. The processor 71 (U1) contains a crystal oscillator and a filter circuit. The intelligent control unit protection circuit 74 (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 stages and further comprises a step-down module.
The communication mode of the communication module 73 (U3) may be wired: industrial buses such as RS232, RS485, CAN-BUS, optical fiber Ethernet, 4-20mA, hart, IIC, SPI, wire, coaxial cable, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, etc., WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, sonar, etc. The display and output 75 (U5) may be: the nixie tube, LED, LCD, HMI, the display, the matrix screen, the printer, the fax, the projector, the mobile phone and the like can be formed by one or a plurality of flexible combination. The data store 76 (U6) may be: FLASH, RAM, ROM, hard disk, SD, etc., flash memory card, magnetic tape, punched paper tape, optical disk, U disk, optical disk, film, etc., can be one kind or a plurality of kinds of flexible combination.
Example nineteenth:
as shown in fig. 19, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), and the like. The processor 71 (U1) contains a crystal oscillator and a filter circuit. The intelligent control unit protection circuit 74 (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 two stages and also comprises a voltage reducing module. The pressure sensor 2 passes through an overvoltage protection circuit and an operational amplifier circuit, and then passes through a filter circuit to a processor 71 (U1). In the communication module 73 (U3), the communication chip passes through the surge protection circuit to the communication interface.
Example twenty:
FIG. 20 is a schematic circuit diagram of a 4-20mA density transmitter. As shown in FIG. 20, the 4-20Ma type density transmitter mainly comprises a microprocessor (comprising a main controller, a crystal oscillator and a filter circuit), a power supply, a modulation circuit, a current loop, a protection circuit, an analog pressure sensor, an operational amplifier, a temperature sensor, a proportion modulation module, a voltage reduction module and the like. The microprocessor includes crystal oscillator and 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 and the operational amplification circuit, then passes through the filter circuit and then passes through the microprocessor after reaching the modulation circuit, so that the microprocessor can acquire a pressure value and a temperature value, and a density value signal is obtained after calculation and conversion of the microprocessor. The density value signal is passed through a proportional modulation module, a modulation circuit and a current loop to obtain a density value of 4-20 Ma.
In a word, after the analog pressure sensor, the temperature sensor and the micro water sensor pass through the amplifying circuit, the analog pressure sensor, the temperature sensor and the micro water sensor are subjected to A/D conversion to the MCU, and pressure, temperature and water collection is realized. The intelligent control unit 7 can be provided with or connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.
Example twenty-one:
FIG. 21 is a schematic diagram of a transmitter for an on-line check density relay in accordance with a twenty-first embodiment of the application. As shown in fig. 21, the transmitter includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. And the intelligent control unit 7 includes: processor 71 (U1), power supply 72 (U2), communication module 73 (U3), intelligent control unit protection circuit 74 (U4), valve controller 77 (U7), execution controller 78 (U8), human-machine interface 79 (U9), pressure adjustment mechanism position detection 511, and the like. The execution controller 78 (U8), which may also be referred to as a control system, may be provided on the intelligent control unit 7; or part of the control system is arranged on the pressure regulating mechanism 5, and the two are closely matched and fused together.
Example twenty two:
FIG. 22 is a schematic diagram of a monitoring system. As shown in FIG. 22, a plurality of high-voltage electrical equipment with sulfur hexafluoride air chambers and a plurality of transmitters are connected with a background monitoring terminal through a hub and an IEC61850 protocol converter in sequence. Each transmitter is arranged on high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB (HUB 1, HUB2, … … HUBm) through the HUB 0. Each HUB HUB is connected with a group of transmitters, such as HUB HUB1 is connected with transmitters Z11, Z12 and … … Z1n, HUB HUB2 is connected with transmitters Z21, Z22 and … … Z2n and … …, and HUB HUBm is connected with transmitters Zm1, zm2 and … … Zmn, wherein m and n are natural numbers.
The background monitoring terminal comprises: 1) Background software platform: based on Windows, linux and others, or VxWorks, android, unix, UCos, freeRTOS, RTX, embOS, macOS. 2) Background software key business module: such as rights management, device management, data storage in queries, etc., as well as user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data collection, data parsing, recording conditions, exception handling, etc. 3) Interface configuration: such as Form interfaces, web interfaces, configuration interfaces, etc.
Example twenty-three:
Fig. 23 is a schematic diagram of a monitoring system. In this embodiment, the Gateway, the comprehensive application Server, and the protocol converter/on-line monitoring intelligent unit ProC are added. In this embodiment, the background monitoring terminal PC is connected to two comprehensive application servers Server1 and Server2 through a Gateway of the network switch, and the two comprehensive application servers Server1 and Server2 communicate with a plurality of protocol converters/on-line monitoring intelligent units ProC (ProC 1, proC2 and … … ProCn) through a site control layer a network and a site control layer B network, and the protocol converters/on-line monitoring intelligent units ProC communicate with a plurality of HUBs HUB (HUB 1, HUB2 and HUB … … HUBm) through an R5485 network. Each HUB HUB is connected with a group of transmitters, such as HUB HUB1 is connected with transmitters Z11, Z12 and … … Z1n, HUB HUB2 is connected with transmitters Z21, Z22 and … … Z2n and … …, and HUB HUBm is connected with transmitters Zm1, zm2 and … … Zmn, wherein m and n are natural numbers.
Example twenty-four:
FIG. 24 is a schematic diagram of a monitoring system. The embodiment is an architecture diagram of a wireless transmission mode, in which a virtual frame indicates that the wireless module Wn and the transmitter Zn can be made into a whole or separated, and the specific scheme can be flexible.
The plurality of comprehensive application servers Server1, server2, … … Server n are in wireless communication with each transmitter through the cloud Cluod, the wireless gateway (WIRELESS GATEWAY), and the wireless module of each transmitter. Wherein n is a natural number.
Besides checking the gas density relay on line, the system can monitor the temperature, pressure, density, micro water and other physical quantities of SF6 gas in the electrical equipment such as a breaker, a GIS and the like and the change trend of the SF6 gas in real time, has a communication interface, uploads data to a background monitoring terminal, realizes the on-line monitoring function of the SF6 gas density, the micro water and other physical quantities of the electrical equipment such as the breaker, the GIS and the like, can flexibly set an alarm limit, inquires historical data on site, accurately analyzes and judges the gas leakage trend and the gas leakage rate of the equipment, discovers abnormal conditions of the equipment in advance, thereby ensuring the safe operation of the electrical equipment and the whole system of a transformer substation, and truly realizes the on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station. Configuration principle: the system is built by adopting a bus type layered distributed structure, and the three-layer system structure requirement of the intelligent substation is met: the whole system adopts IEC61850 standard power communication protocol, namely a process layer (a sensor layer, namely a transmitter for checking the density relay on line), a spacer layer (a data transmission and acquisition processing layer) and a station control layer (a monitoring host, a database server and the like). The background monitoring terminal is responsible for collecting monitoring data, comprehensively analyzing, diagnosing faults, storing and transmitting standardized data, and has the functions of real-time data display, change trend analysis, historical data inquiry, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electric equipment without going to the site, can check and detect a gas density relay on line, can provide firm basis for state maintenance of SF6 electric equipment through big data analysis and trend analysis by expert analysis software, meets the requirements of power grid automation and equipment state maintenance, plays an important role in improving the safe operation and operation management level of a power grid system, developing expected diagnosis and trend analysis and reducing unplanned power failure maintenance.
The verification accuracy of the transmitter verification gas density relay can be related to the power industry or national standard. At different temperatures, the verification requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performance specifications in DL/T259 sulfur hexafluoride gas density relay verification regulations, and the accuracy requirements corresponding to each temperature value, namely, the error judgment requirements, can be different according to the standards or can be specified separately. The comparison and judgment of different annual contemporaneous (or same season) can be carried out. For example, the result of the 5 th month in 2021 may be directly compared with the result of the 5 th month in 2019 and the 5 th month in 2020, and the trend analysis may be performed to determine. The verification can be carried out when the verification is needed, the movable design can be carried out, namely the operation of the substation A can be carried out for a period of time, the operation of the substation B can be carried out for a period of time after the task is completed, and the operation of the substation C can be carried out after the task is completed.
The calibration precision of the transmitter for the on-line calibration density relay can reach 0.25 level at 20 degrees, reaches 0.625 level at high temperature or low temperature, meets the requirements, and meets the requirements or related specifications economically and in metering.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (66)
1. A transmitter for an on-line check density relay, comprising: the intelligent control system comprises a shell, and a pressure sensor, a temperature sensor, a communication module, an intelligent control unit and an equipment connecting joint which are arranged in the shell, wherein the transmitter is communicated with electric equipment and a gas density relay through the equipment connecting joint; the transmitter also comprises a valve, a pressure regulating mechanism and an on-line check joint signal sampling unit; wherein,
One end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the gas circuit of the gas density relay and the pressure sensor;
The pressure regulating mechanism is communicated with the gas path of the gas density relay and the gas path of the pressure sensor, and is configured to regulate the pressure rise and fall of the gas path of the gas density relay so as to enable the gas density relay to generate contact action;
the pressure sensor is communicated with the gas density relay on a gas path;
the on-line checking contact signal sampling unit is respectively connected with the signal generator of the gas density relay and the intelligent control unit, and is used for sampling contact signals generated when the gas density relay is in contact action and transmitting the contact signals to the intelligent control unit; the on-line check contact signal sampling unit comprises a first connecting circuit and a second connecting circuit; the first connecting circuit is connected with the contact point of the gas density relay and the contact point signal control loop, and the second connecting circuit is connected with the contact point of the gas density relay and the intelligent control unit; in a non-verification state, the contact is a normally open type density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact point of the gas density relay is connected with the intelligent control unit; or in a non-checking state, the contact is a normally-closed density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in the verification state, the contact signal control loop is closed, the connection between the contact of the gas density relay and the contact signal control loop is disconnected, and the second connection circuit is communicated to connect the contact of the gas density relay with the intelligent control unit;
The intelligent control unit is also respectively connected with the valve, the pressure regulating mechanism, the pressure sensor, the temperature sensor and the communication module, and is used for converting data acquired by the pressure sensor and the temperature sensor into standard signals, controlling the valve to be closed or opened, completing the control of the pressure regulating mechanism, receiving a pressure value and a temperature value and/or a gas density value when a contact point of the gas density relay acts, and remotely transmitting the pressure value and the temperature value and/or the gas density value to a corresponding detection system or target equipment through the communication module;
wherein the contact signal includes an alarm and/or a latch.
2. The transmitter for an on-line check density relay of claim 1, wherein: the signal generator comprises a micro switch or a magnetic-assisted electric contact, and the gas density relay outputs a contact signal through the signal generator.
3. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit converts the data acquired by the pressure sensor and the temperature sensor into a gas density value, namely a pressure value corresponding to 20 ℃; or converted into a digital signal of the gas density value to complete the on-line monitoring of the gas density.
4. The transmitter for an on-line check density relay of claim 3, wherein: the intelligent control unit calculates the gas density value by adopting a mean value method, wherein the mean value method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or alternatively
In a set time interval, setting a temperature interval step length, and carrying out average value calculation on density values corresponding to N different temperature values acquired in all temperature ranges to obtain a gas density value; or alternatively
In a set time interval, setting a pressure interval step length, and carrying out average value calculation on density values corresponding to N different pressure values acquired in all pressure variation ranges to obtain a gas density value;
Wherein N is a positive integer greater than or equal to 1.
5. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit converts the data acquired by the pressure sensor and the temperature sensor into current signals with corresponding density values.
6. The transmitter for an on-line check density relay of claim 5, wherein: the current signal is a direct current signal.
7. The transmitter for an on-line check density relay of claim 6, wherein: the direct current signal is 0-10 mA or 4-20 mA.
8. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit converts the data acquired by the pressure sensor and the temperature sensor into voltage signals with corresponding density values.
9. The transmitter for an on-line check density relay of claim 8, wherein: the voltage signal is a direct current voltage signal.
10. The transmitter for an on-line check density relay of claim 9, wherein: the direct-current voltage signal is 1-5V.
11. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit is based on an embedded algorithm and a control program of the embedded system of the microprocessor and automatically controls the whole verification process, and comprises all peripherals, logic and input and output.
12. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit acquires the pressure value and the temperature value acquired by the pressure sensor and the temperature sensor when the gas density relay is in contact action, and converts the pressure value and the temperature value into the pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely the gas density value, so as to finish the online verification of the gas density relay.
13. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter automatically realizes the testing of the absolute pressure type gas density relay and/or the relative pressure type gas density relay.
14. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity or digital quantity information.
15. The transmitter for an on-line check density relay of claim 14, wherein: the electrical interface is provided with an electrical interface protection circuit that prevents the interface from being damaged by a user misconnection and/or prevents electromagnetic interference.
16. The transmitter for an on-line check density relay of claim 1, wherein: the intelligent control unit is also provided with a clock, and the clock is used for periodically setting check time, recording test time or recording event time.
17. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter monitors the gas density value of the electrical equipment on line, and if the gas density value is abnormal, the transmitter starts on-line verification of the gas density relay.
18. The transmitter for an on-line check density relay of claim 1, wherein: after the transmitter finishes the verification of the gas density relay, the intelligent control unit automatically generates a verification report of the gas density relay, and if the verification report is abnormal, the intelligent control unit automatically gives an alarm, and/or uploads the alarm to a far end and/or sends the alarm to a designated receiver.
19. The transmitter for an on-line check density relay of claim 1, wherein: after the transmitter finishes the verification of the gas density relay, if the gas density relay is abnormal, the intelligent control unit uploads an alarm contact signal of the gas density relay to a far end and/or sends the alarm contact signal to a designated receiver through a communication module.
20. The transmitter for an on-line check density relay of claim 1, wherein: the valve is an electric valve and/or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
21. The transmitter for an on-line check density relay of claim 1, wherein: the valve is closed or opened in a hose bending or flattening mode.
22. The transmitter for an on-line check density relay of claim 1, wherein: the valve is sealed in a cavity; or alternatively
The valve and the pressure regulating mechanism are sealed within a cavity.
23. The transmitter for an on-line check density relay of claim 1, wherein: the valve is closed, the pressure regulating mechanism is boosted, the load is increased, or the pressure regulating mechanism is depressurized, the load is reduced, and the change speed of the load is not more than 10 per mill of the measuring range of the gas density relay per second.
24. The transmitter for an on-line check density relay of claim 1, wherein: pressure sensors are respectively arranged on two sides of the gas path of the valve; or pressure or density detectors are respectively arranged on two sides of the gas path of the valve.
25. The transmitter for an on-line check density relay of claim 1, wherein: the front end of the valve is provided with a density relay or a density switch, and a signal of a safety check set point is output and is connected with the intelligent control unit.
26. The transmitter for an on-line check density relay of claim 1, wherein: the temperature sensor is arranged on or in the housing of the gas density relay or on or in the housing of the transmitter.
27. The transmitter for an on-line check density relay of claim 1, wherein: at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of the gas density relay, which temperature compensation element adopts a temperature compensation sheet or a gas enclosed in a shell.
28. The transmitter for an on-line check density relay of claim 27, wherein: at least one temperature sensor is disposed at an end of the pressure detector of the gas density relay adjacent to the temperature compensation element.
29. The transmitter for an on-line check density relay of claim 1, wherein: the pressure sensor and the temperature sensor are of an integrated structure.
30. The transmitter for an on-line check density relay of claim 29, wherein: the integrated structure formed by the pressure sensor and the temperature sensor has a remote transmission function, and remotely transmits the monitored pressure value and temperature value, and/or the gas density value, and/or the joint signal of the remote transmission gas density relay.
31. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter comprises at least two pressure sensors, pressure values acquired by the pressure sensors are compared, and mutual verification among the pressure sensors is completed.
32. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter comprises at least two temperature sensors, temperature values acquired by the temperature sensors are compared, and mutual verification among the temperature sensors is completed.
33. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter includes at least one pressure sensor and at least one temperature sensor; the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and each gas density value is compared to finish the mutual verification of each pressure sensor and each temperature sensor; or comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with comparison density value output signals output by the gas density relay to finish the mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.
34. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter is provided with a comparison density value output signal which is connected with the intelligent control unit; or the transmitter is provided with a comparison pressure value output signal which is connected with the intelligent control unit.
35. The transmitter for an on-line check density relay of claim 1, wherein: the pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, the temperature of the air in the closed air chamber is changed due to the heating of the heating element and/or the refrigerating of the refrigerating element, and then the pressure rise and fall of the air density relay are completed.
36. The transmitter for an on-line check density relay of claim 35, wherein: the heating element and/or the cooling element is a semiconductor.
37. The transmitter for an on-line check density relay of claim 35, wherein: the pressure regulating mechanism further comprises a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber.
38. The transmitter for an on-line check density relay of claim 1, wherein: the pressure regulating mechanism is a cavity with one end open, and the other end of the cavity is communicated with a gas path of the gas density relay; the piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod to drive the piston to move in the cavity; or alternatively
The pressure regulating mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving component is arranged outside the closed air chamber, and the driving component pushes the piston to move in the closed air chamber through electromagnetic force; or alternatively
The pressure regulating mechanism is an air bag with one end connected with the driving component, and the air bag is subjected to volume change under the driving of the driving component; or alternatively
The pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay, and the other end of the corrugated pipe stretches under the drive of the driving part; or alternatively
The pressure regulating mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or other deflation valves realized by an electric or gas mode; or alternatively
The pressure regulating mechanism is a compressor; or alternatively
The pressure regulating mechanism is a pump, and the pump comprises a pressure-making pump, a booster pump, an electric air pump or an electromagnetic air pump;
Wherein the driving component comprises one of magnetic force, a motor, a Carnot circulation mechanism and a pneumatic element.
39. The transmitter for an on-line check density relay of claim 1, wherein: the pressure regulating mechanism is sealed in a cavity.
40. The transmitter for an on-line check density relay of claim 1, wherein: the on-line checking contact signal sampling unit is provided with at least two independent sampling contacts, can automatically complete checking on at least two contacts of the gas density relay at the same time, and is used for continuous measurement without replacing the contacts or reselecting the contacts; wherein,
The contacts comprise one of an alarm contact, a locking contact, an alarm contact, a locking 1 contact, a locking 2 contact, an alarm contact, a locking contact and an overpressure contact.
41. The transmitter for an on-line check density relay of claim 1, wherein: and the on-line checking contact signal sampling unit applies a voltage not lower than 24V to the contact action value or the switching value of the gas density relay, namely, when checking, the voltage not lower than 24V is applied between the corresponding terminals of the contact.
42. The transmitter for an on-line check density relay of claim 1, wherein: the on-line checking joint signal sampling unit and the intelligent control unit are arranged together.
43. A transmitter for an on-line check density relay according to claim 42, wherein: the on-line checking joint signal sampling unit and the intelligent control unit are sealed in a cavity.
44. The transmitter for an on-line check density relay of claim 1, wherein: the first connecting circuit comprises a first relay, the second connecting circuit comprises a second relay, the first relay is provided with at least one normally-closed contact, the second relay is provided with at least one normally-open contact, and the normally-closed contact and the normally-open contact keep opposite switch states; the normally-closed contact is connected in series in the contact signal control loop, and the normally-open contact is connected to the contact of the gas density relay;
in a non-verification state, the normally-closed contact is closed, the normally-open contact is opened, and the gas density relay monitors the output state of the contact in real time; in the verification state, the normally-closed contact is opened, the normally-open contact is closed, and the contact of the gas density relay is connected with the intelligent control unit through the normally-open contact.
45. The transmitter for an on-line check density relay of claim 44, wherein: the first relay and the second relay are two independent relays or the same relay.
46. The transmitter for an on-line check density relay of claim 1, wherein: the on-line checking contact signal sampling unit is electrically isolated from the contact of the gas density relay by photoelectricity.
47. The transmitter for an on-line check density relay of claim 1, wherein: the communication mode of the communication module is a wired communication mode or a wireless communication mode.
48. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter further includes a multi-way joint, and the gas density relay, valve and pressure regulating mechanism are disposed on the multi-way joint.
49. A transmitter for an on-line check density relay according to claim 48, wherein: the valve is embedded on the multi-way joint.
50. A transmitter for an on-line check density relay according to claim 48, wherein: the transmitter further comprises a self-sealing valve, and the self-sealing valve is installed on the multi-way joint.
51. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter further comprises a micro water sensor, wherein the micro water sensor is connected with the intelligent control unit and is used for monitoring the gas micro water value on line.
52. The transmitter for an on-line check density relay of claim 51, wherein: the transmitter also comprises a gas circulation mechanism, the gas circulation mechanism is connected with the intelligent control unit, the gas circulation mechanism comprises a capillary tube, a sealed cavity and a heating element, the gas circulation mechanism is heated by the heating element to realize gas flow, and the gas micro-water value is monitored on line.
53. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter further comprises a decomposition product sensor for on-line monitoring of gas decomposition products, and the decomposition product sensor is connected with the intelligent control unit.
54. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter also includes a gas density relay including a digital or liquid crystal display device having an indication display.
55. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter also comprises a data display interface for man-machine interaction, and can refresh the current data value in real time; and/or support data entry.
56. The transmitter for an on-line check density relay of claim 1, wherein: the valve and the pressure regulating mechanism are connected together through a connecting pipe.
57. The transmitter for an on-line check density relay of claim 1, wherein: the pressure sensor, the temperature sensor, the on-line checking joint signal sampling unit and the intelligent control unit are arranged in or on the shell of the gas density relay.
58. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter also comprises a power supply for supplying power to each electric equipment, wherein the power supply comprises a power supply circuit, or a battery or a power supply obtained by taking power from a transformer.
59. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter periodically sets the time for checking the gas density relay on line.
60. The transmitter for an on-line check density relay of claim 1, wherein: when the gas density value or the pressure value is lower than the set value, the transmitter automatically does not check and sends out a notification signal.
61. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter is also provided with a temperature protection device for the electronic components, and the temperature protection device is used for ensuring that the electronic components reliably work at low temperature or high temperature environment temperature; the temperature protection device comprises a heater and/or a radiator, wherein the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.
62. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter also includes an analysis system for monitoring the gas density value and for detecting, analyzing and determining the electrical performance of the gas density relay and the monitoring element.
63. The transmitter for an on-line check density relay of claim 1, wherein: the transmitter further comprises a camera for monitoring.
64. A monitoring system, characterized by: the monitoring system is constituted by a transmitter for an on-line check density relay of any one of claims 1 to 63; or the monitoring system includes a transmitter for an on-line check density relay of any one of claims 1 to 63.
65. The method for implementing a transmitter for an on-line check density relay of claim 1, wherein: comprising the following steps:
During normal operation, a transmitter for an on-line check density relay monitors the gas density in the electrical equipment, and simultaneously the transmitter remotely transmits the monitored pressure value and temperature value and/or the gas density value in the electrical equipment through a pressure sensor, a temperature sensor and an intelligent control unit;
the transmitter is according to the check time and/or check command that set for, and the gas density value condition, under the condition that allows checking gas density relay:
The intelligent control unit is used for adjusting the pressure regulating mechanism to a verified initial state;
closing the valve by an intelligent control unit;
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay to connect a contact of the gas density relay to the intelligent control unit;
The intelligent control unit drives the pressure regulating mechanism to enable the gas pressure to slowly drop, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during the contact action, the contact action value of the gas density relay is detected, and the checking work of the contact action value of the gas density relay is completed;
After all the verification works are completed, the intelligent control unit opens the valve, and adjusts the on-line verification contact signal sampling unit to a working state, and the contact signal control loop of the gas density relay resumes to operate in a normal working state.
66. The method of implementing a transmitter for an on-line check density relay of claim 65, further comprising:
After the transmitter finishes the verification work of the contact action value of the gas density relay, and before the valve is opened, the intelligent control unit drives the pressure regulating mechanism through the intelligent control unit to enable the gas pressure to slowly rise, so that the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line verification contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during the contact reset, the contact return value of the gas density relay is detected, and the verification work of the contact return value of the gas density relay is finished.
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