WO2021218288A1

WO2021218288A1 - Online checking apparatus for gas density relay and online checking method thereof

Info

Publication number: WO2021218288A1
Application number: PCT/CN2021/076134
Authority: WO
Inventors: 曾伟; 申晓礼; 王恩林; 夏铁新; 金海勇
Original assignee: 上海乐研电气有限公司
Priority date: 2020-04-29
Filing date: 2021-02-09
Publication date: 2021-11-04
Also published as: CN111443283B; CN111443283A

Abstract

An online checking apparatus for a gas density relay (1) and an online checking method thereof. The online checking apparatus comprises a gas density measurement sensor, a normally open valve (4), a normally closed valve (11), a multi-way connector (9), a gas source generation unit (5), an online checking contact signal sampling unit (6), and an intelligent control unit (7). A gas pressure fluctuation achieved by means of the normally open valve (4), the normally closed valve (11), and the gas source generation unit (5) causes the gas density relay (1) to perform a contact signal action, the contact signal action is transmitted to the intelligent control unit (7) by means of the online checking contact signal sampling unit (6), and the intelligent control unit (7) measures a contact signal action value and/or return value of the gas density relay (1) according to a density value during the contact signal action, so that the checking work of the gas density relay (1) can be completed without needing a maintainer on the scene, thus improving the reliability of a power grid, increasing the efficiency, and reducing costs. Moreover, in the whole checking process, checking is performed without using the gas of an electrical device, and the gas source required for checking is provided by the gas source generation unit (5), thereby achieving environmental protection, safety, and economy.

Description

Gas density relay online calibration device and online calibration method

Priority of Chinese Patent Application: This application claims the application 29 April 2020 Application No. 202010354529.9 (one kind of gas density relay line-line verification apparatus and verification method of Title).

Technical field

The invention relates to the field of electric power technology, and in particular to an online calibration device and an online calibration method for a gas density relay applied to high-voltage and medium-voltage electrical equipment.

Background technique

The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment is reduced and the content of micro water exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment: 1) SF6 gas density is reduced to a certain extent Will lead to loss of insulation and arc extinguishing performance. 2) With the participation of some metals, SF6 gas can undergo hydrolysis reaction with water at a high temperature of 200℃ or higher to generate active HF and SOF ₂ , corrode insulating parts and metal parts, and generate a lot of heat, which will increase the pressure of the gas chamber. high. 3) When the temperature drops, too much moisture may form condensation, which will significantly reduce the insulation strength of the surface of the insulator, or even flashover, causing serious harm. Therefore, the power grid operation regulations compulsorily stipulate that the density and water content of SF6 gas must be regularly tested before and during the operation of the equipment.

With the continuous vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important part and key node of smart substations, plays a pivotal role in the security of smart grids. High-voltage electrical equipment is currently mostly SF6 gas insulated equipment. If the gas density is reduced (caused by leakage, etc.), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, online monitoring of gas density values in SF6 high-voltage electrical equipment has become very common, and for this reason, the application of gas density monitoring systems (gas density relays) will flourish. The gas density monitoring system (gas density relay) in the prior art is basically: 1) Use remote SF6 gas density relay to realize the collection and upload of density, pressure and temperature, and realize online monitoring of gas density; 2) Application of gas density The transmitter realizes the collection and uploading of density, pressure and temperature, and realizes on-line monitoring of gas density. SF6 gas density relay is the core and key component. However, due to the harsh operating environment of the high-voltage substation, especially the strong electromagnetic interference, in the gas density monitoring system (gas density relay) currently in use, the remote SF6 gas density relay is composed of mechanical density relays and electronic remote transmissions. In addition, the grid system that uses gas density transmitters still retains traditional mechanical density relays. The mechanical density relay has one, two or three sets of mechanical contacts, which can transmit the information to the target equipment terminal through the contact connection circuit in time when the pressure reaches the state of alarm, blocking or overpressure, to ensure the safe operation of the equipment. At the same time, the monitoring system is also equipped with a safe and reliable circuit transmission function, which establishes an effective platform for real-time data remote data reading and information monitoring, and can timely transmit pressure, temperature, density and other information to the target device (usually a computer terminal) ) Realize online monitoring.

Regular inspection of gas density relays on electrical equipment is a necessary measure to prevent problems before they occur and ensure the safe and reliable operation of electrical equipment. Both the "Electric Power Preventive Test Regulations" and the "Twenty-Five Key Requirements for Preventing Major Accidents in Electric Power Production" require periodic calibration of gas density relays. Judging from the actual operating conditions, regular calibration of gas density relays is one of the necessary means to ensure the safe and reliable operation of power equipment. Therefore, the current calibration of gas density relays has been attached great importance to and popularized in the power system, and various power supply companies, power plants, and large factories and mines have all implemented it. Power supply companies, power plants, and large factories and mines need to be equipped with testers, equipment vehicles and high-value SF6 gas to complete the on-site verification and testing of gas density relays. Including the business loss during the power outage during the inspection, a rough calculation shows that the annual inspection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the inspectors do not perform the on-site verification, there are still potential safety hazards. For this reason, it is very necessary to innovate in the existing gas density self-checking gas density relay, especially the gas density online self-checking gas density relay or system, so that the gas density relay or composition monitoring that realizes the gas density online monitoring The system also has the calibration function of the gas density relay, and then completes the regular calibration work of the (mechanical) gas density relay, and at the same time realizes that the gas of the electrical equipment is not used for the calibration during the entire calibration process, which is environmentally friendly, safe and economical, and There is no need for maintenance personnel to go to the scene.

Summary of the invention

The purpose of the present invention is to provide an online calibration device and an online calibration method for a gas density relay to solve the problems raised in the technical background.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

The first aspect of this application provides an online calibration device for a gas density relay, which includes: a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generating unit, an online calibration contact signal sampling unit, and Intelligent control unit;

The gas density detection sensor is in communication with the multi-way connector;

The multi-way connector is provided with a first interface, a second interface, a third interface, and a fourth interface that are connected to each other, wherein the first interface is connected to the gas density relay;

One end of the normally open valve is provided with an interface that communicates with electrical equipment, and the other end of the normally open valve is connected to the second interface of the multi-way connector; the normally open valve is configured to turn off or turn on electrical equipment. The air circuit of the equipment, complete the air circuit closing of the electrical equipment;

The gas path of the gas source generating unit is connected to the third interface of the multi-way connector; the gas source generating unit is configured to provide a gas source when the gas density relay is checked online;

One end of the normally closed valve is connected to the fourth port of the multi-way connector, and the other end of the normally closed valve is connected to the atmosphere; the normally closed valve is configured to be closed or open to be connected to the multi-way connector The gas circuit of the gas density relay causes the gas density relay to generate a contact signal action;

The online verification contact signal sampling unit is connected to the gas density relay to be verified online, and is configured to sample the contact signal of the gas density relay;

The intelligent control unit is respectively connected with the normally open valve, normally closed valve, gas density detection sensor and the online verification contact signal sampling unit, and is configured to control the closing or opening of the normally open valve, and control Closing or opening of the normally closed valve, pressure value collection and temperature value collection, and/or gas density value collection, and detection of the contact signal action value and/or contact signal return value of the gas density relay;

Wherein, the contact signal includes alarm and/or lockout.

Preferably, the normally open valve or normally closed valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a valve that is made of smart memory material and opened or closed by electric heating New type of valve.

Preferably, the normally open valve communicates with the electrical equipment through an electrical equipment connection joint.

Preferably, a second pressure sensor is further provided on the side of the normally open valve close to the electrical equipment, and the second pressure sensor is connected to the intelligent control unit and is configured to monitor the gas pressure value of the electrical equipment.

Preferably, the normally closed valve and/or normally open valve are sealed in a cavity or housing.

Preferably, the gas density relay online verification device further includes a flow controller, which communicates with the other end of the normally closed valve; or, the flow controller is arranged on a multi-way joint and a normally closed valve. Between the valves; the flow controller is configured to control the flow of gas.

Preferably, the air source generating unit includes one of a compressor, an air pump, a pressure generating pump, a booster pump, an electric air pump, and an electromagnetic air pump.

Preferably, the gas density relay online verification device further includes a gas source normally closed valve, and the gas source normally closed valve is arranged between the multi-way connector and the gas source generating unit.

Preferably, the gas density relay online calibration device further includes a filter element, the filter element is arranged on a gas path connected to a normally open valve, or a normally closed valve, or a multi-way joint, or a gas source generating unit.

Preferably, the gas density relay online verification device further includes a moisture treatment agent, the moisture treatment agent is arranged on the multi-way connector or the air source generating unit; preferably, the moisture treatment agent includes an adsorbent, a dry One of the agents.

Preferably, the gas density relay online calibration device further includes a gas leakage alarm contact, which is connected in series or in parallel with the alarm contact of the gas density relay to be checked online, and the gas leakage alarm contact is also connected to the intelligent control unit. connect.

Specifically, within a set time period, the normally open valve is closed under the control of the intelligent control unit, and the intelligent control unit monitors the gas density value P ₂₀ through the gas density detection sensor, and finds that the gas density value P ₂₀ gradually changes through calculation. Small, the intelligent control unit sends out a gas leak alarm contact signal or/and information through the gas leak alarm contact; or the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and finds that the gas pressure value P gradually becomes smaller through calculation and processing. The control unit sends out a leak alarm contact signal or/and information through the leak alarm contact.

Preferably, the gas density relay online verification device further includes a pressure adjustment mechanism that communicates with the other end of the normally closed valve; the pressure adjustment mechanism is configured to adjust the pressure rise and fall of the gas.

More preferably, during the verification, the pressure adjusting mechanism is a closed air chamber, the closed air chamber is connected to the normally closed valve, and heating elements and/or cooling elements are arranged outside or inside the closed air chamber , Heating by the heating element and/or cooling by the refrigeration element, resulting in a change in the temperature of the gas in the airtight chamber, thereby completing the pressure rise and fall of the gas density relay that is checked online; or,

The pressure adjusting mechanism is a cavity with one end open, the other end of the cavity communicates with the normally closed valve, a piston is inside the cavity, and one end of the piston is connected with an adjusting rod. One end 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,

The pressure regulating mechanism is a closed air chamber, the closed air chamber is connected to the normally closed valve, the closed air chamber is provided with a piston inside, and the piston is in sealing contact with the inner wall of the closed air chamber. A driving part is provided on the outside of the airtight chamber, and the driving part pushes the piston to move in the cavity by electromagnetic force; or,

The pressure adjusting mechanism is an airbag with one end connected to a driving member, the airbag changes in volume under the driving of the driving member, and the airbag communicates with the normally closed valve; or,

The pressure adjusting mechanism is a bellows, one end of the bellows is connected to the normally closed valve, and the other end of the bellows is driven by a driving component to expand and contract;

Wherein, the drive component includes one of a magnetic drive mechanism, a motor, a reciprocating motion mechanism, a Carnot cycle mechanism, and a pneumatic element.

Preferably, the gas density detection sensor is arranged on a multi-way connector; or, the gas density detection sensor is arranged on a gas density relay for online verification.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor. The pressure sensor is installed on the gas path of the gas density relay for online verification, and the temperature sensor is installed on the gas path of the gas density relay for online verification. Outside the gas circuit, or installed in the gas density relay for online verification, or installed outside the gas density relay for online verification; or, the gas density detection sensor adopts a gas density transmitter composed of a pressure sensor and a temperature sensor Or, the gas density detection sensor adopts a density detection sensor of quartz tuning fork technology.

More preferably, the temperature sensor may be a thermocouple, a thermistor, or a semiconductor type; it may be a contact type or a non-contact type; it may be a thermal resistance or a thermocouple.

More preferably, at least one temperature sensor is arranged near the temperature compensation element of the gas density relay for online verification, or arranged on the temperature compensation element, or integrated in the temperature compensation element; preferably, at least one temperature sensor is arranged at The pressure detector of the on-line calibration gas density relay is close to one end of the temperature compensation element.

More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.

Further, when the pressure sensor is an absolute pressure sensor, it is represented by an absolute pressure value, and its verification result is the corresponding absolute pressure value of 20°C, which is represented by a relative pressure value, and the verification result is converted into a corresponding 20°C absolute pressure value. The relative pressure value of ℃; when the pressure sensor is a relative pressure sensor, it is expressed by the relative pressure value, and the verification result is the corresponding relative pressure value of 20℃, expressed by the absolute pressure value, and the verification result is converted into Corresponding absolute pressure value of 20℃;

The conversion relationship between the absolute pressure value and the relative pressure value is:

P _{absolute pressure} = P _{relative pressure} + P _{standard atmospheric pressure} .

Further, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil attached to a Baden tube), or a resistance pressure sensor (such as a Baden tube attached to the pressure sensor). Pressure sensor with sliding wire resistance); it can be an analog pressure sensor or a digital pressure sensor.

Preferably, the online verification contact signal sampling unit includes an isolation sampling element, the isolation sampling element is controlled by a normally open valve or an intelligent control unit; in the non-verification state, the online verification contact signal sampling unit passes The contact signal of the isolation sampling element and the gas density relay is relatively isolated on the circuit; in the verification state, the online verification contact signal sampling unit cuts off the contact signal control loop of the gas density relay through the isolation sampling element, and reduces the gas density The contact of the relay is connected with the intelligent control unit; wherein, the isolation sampling element includes one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optocoupler, and a silicon controlled rectifier.

More preferably, the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contact of the gas density relay and the contact signal control circuit, and the second connection circuit is connected to the gas The contact of the density relay and the intelligent control unit; in the non-verification state, the second connection circuit is disconnected, and the first connection circuit is closed; in the verification state, the online verification contact signal sampling unit The first connection circuit is cut off, the second connection circuit is connected, and the contact point of the gas density relay is connected to the intelligent control unit.

Preferably, the online verification contact signal sampling unit and the intelligent control unit are arranged together.

More preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or shell.

Preferably, the online verification contact signal sampling unit for sampling the contact signal of the gas density relay for online verification satisfies: the online verification contact signal sampling unit has at least one set of independent sampling contacts, which can simultaneously perform sampling of at least one contact Automatically complete the calibration, and continuous measurement, no need to replace the contact or re-select the contact; among them, the contact includes, but not limited to alarm contact, alarm contact + lock contact, alarm contact + lock 1 contact + lock 2 contact, alarm contact + One of latching contacts + over-pressure contacts.

Preferably, the test voltage of the online verification contact signal sampling unit for the contact signal action value or the switching value of the online verification gas density relay is not lower than 24V, that is, between the corresponding terminals of the contact signal during verification Apply a voltage of not less than 24V.

Preferably, the gas density relay online verification device further includes a gas density relay, the gas density relay includes a housing, and a base, a pressure detector, a temperature compensation element, and at least one signal generator arranged in the housing. Wherein, the signal generator includes a micro switch or a magnetic-assisted electric contact, the gas density relay outputs a contact signal through the signal generator; the pressure detector includes a Baden tube or a bellows; the The temperature compensation element adopts a temperature compensation sheet or a gas enclosed in the housing.

More preferably, the gas density detection sensor is arranged on a multi-way joint; or, the gas density detection sensor is arranged on the gas density relay.

More preferably, the gas density relay and the gas density detection sensor are an integrated structure; preferably, the gas density relay and the gas density detection sensor are an integrated remote gas density relay.

More preferably, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.

Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete monitoring of the monitored electrical equipment Online monitoring of gas density.

More preferably, the intelligent control unit uses an average value method (average value method) to calculate the gas density value. Perform average calculation processing on the N gas density values of a point to obtain the gas density value; or, in a set time interval and set the temperature interval step, take the N different temperature values collected in the entire temperature range The corresponding density value is calculated by the average value to obtain the gas density value; or, in the set time interval, set the pressure interval step size, and collect the N different pressure values corresponding to the entire pressure change range. The average value of the density value is calculated to obtain the gas density value; where N is a positive integer greater than or equal to 1.

Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal action or switching of the gas density relay to be checked online is performed to complete the online check of the gas density relay; or The intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor when the contact signal action or switching of the gas density relay to be checked online, and converts it into a pressure value corresponding to 20°C according to the gas pressure-temperature characteristics, That is, the gas density value, which completes the online verification of the gas density relay.

Preferably, the intelligent control unit obtains the gas density value P ₂₀ collected by the gas density detection sensor. If the gas density value P ₂₀ ≥ a preset threshold, the intelligent control unit controls and opens the normally closed valve, and at the same time, the intelligent control unit sends Abnormal signal and/or information of excessive pressure; or, the intelligent control unit obtains the gas pressure value P collected by the gas density detection sensor, and if the pressure value P ≥ the preset threshold, the intelligent control unit controls and opens the normally closed valve, At the same time, the intelligent control unit sends out abnormal signals and/or messages of excessive pressure.

Preferably, the intelligent control unit is based on the embedded algorithm and control program of the embedded system of the microprocessor, and automatically controls the entire verification process, including all peripherals, logic, input and output.

More preferably, the intelligent control unit is based on general-purpose computers, industrial computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, etc., industrial control motherboards, embedded main control boards and other embedded algorithms and control programs to automatically control the entire The verification process includes all peripherals, logic, input and output.

Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input Analog quantity, digital quantity information.

Preferably, the intelligent control unit further includes a communication module that realizes long-distance transmission of test data and/or verification results.

More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.

Further, the wired communication mode includes one or more of RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable.

Further, the wireless communication method includes one of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, acoustic wave, satellite, light wave, quantum communication, sonar, or Several kinds.

Preferably, the intelligent control unit is also provided with a clock, and the clock is configured to periodically set the calibration time of the gas density relay, or record the test time, or record the event time.

Preferably, the control of the intelligent control unit is through on-site control and/or through background control.

More preferably, the gas density relay online verification device completes the online verification of the gas density relay according to the settings or instructions of the background; or, according to the set verification time of the gas density relay, completes the gas density relay Online verification.

More preferably, the gas density relay online verification device further includes a first connecting pipe, and the gas path of the normally closed valve is communicated with the gas density relay for online verification through the first connecting pipe; the multi-way connector The first interface is connected to a part of the first connecting pipe between the gas density relay for online verification and the normally closed valve.

Preferably, the gas density relay online verification device further includes a self-sealing valve installed between the electrical equipment and the normally open valve; or, the normally open valve is installed between the electrical equipment and the self-sealing valve between.

Preferably, the gas density relay online verification device further includes a gas supplement interface, the gas supplement interface is arranged on the electrical equipment; or the gas supplement interface is arranged between the electrical equipment and the normally open valve; or , The air supplement interface is provided on a second connecting pipe, and the second connecting pipe connects the normally open valve with the gas path of the multi-way joint, or the second connecting pipe communicates with the normally open valve Gas density relay with online calibration.

Preferably, the gas density relay online calibration device further includes a display interface for human-computer interaction, and the display interface is connected to the intelligent control unit to display current calibration data in real time, and/or support data input .

Preferably, the intelligent control unit further includes a contact resistance detection unit, which is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the gas to be verified online The contact signal of the density relay is isolated from its control loop. When the contact signal of the gas density relay for online calibration is activated, and/or when the contact resistance of the contact is detected, the contact resistance detection unit can detect the online calibration. The contact resistance value of the gas density relay.

Preferably, the intelligent control unit further includes an insulation resistance detection unit, which is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the gas to be verified online The contact signal of the density relay is isolated from its control circuit. When the contact signal of the gas density relay for online verification is activated, and/or when the instruction to detect the insulation resistance of the contact is received, the insulation resistance detection unit can detect the online verification. The insulation resistance value of the contact of the gas density relay.

Preferably, the gas density relay to be checked online includes, but is not limited to, a gas density relay with bimetallic strip compensation, a gas-compensated gas density relay with gas compensation, a gas density relay with a mixture of bimetallic strips and gas compensation; a completely mechanical gas density relay Relay, digital gas density relay, mechanical and digital combined gas density relay; gas density relay with pointer display, digital gas density relay, gas density switch without display or indication; SF6 gas density relay, SF6 mixed Gas density relay, N2 gas density relay.

Preferably, the electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas filling cabinets, and ring network cabinets.

Preferably, the gas density relay online verification device further includes a micro-water sensor, and the micro-water sensor is respectively connected with a multi-way connector and the intelligent control unit.

More preferably, the gas density relay online verification device further includes a gas circulation mechanism connected to the gas density relay for online verification and the intelligent control unit, and the gas circulation mechanism includes a capillary tube, Seal the chamber and heating element.

Further, the micro-water sensor can be installed in the sealed chamber, in the capillary tube, the capillary mouth, or outside the capillary of the gas circulation mechanism.

Preferably, the gas density relay online verification device further includes a decomposition product sensor, and the decomposition product sensor is respectively connected to the multi-way connector and the intelligent control unit.

Preferably, the gas density relay online verification device further includes a camera for monitoring.

The second aspect of the present application provides an online verification method for a gas density relay online verification device, which includes: in a normal working state, the normally open valve of the online verification device is in an open state, the normally closed valve is in a closed state, and the online The calibrated gas density relay monitors the gas density value in electrical equipment;

The online calibration device, according to the set calibration time or/and calibration instructions, and the gas density value, under the condition that the gas density relay is allowed to be calibrated:

Close the normally open valve through the intelligent control unit;

The gas source generating unit is controlled by the intelligent control unit to enable the gas source generating unit to turn on the working mode to provide the gas source required for online verification. When the gas pressure of the gas source reaches its preset threshold, the intelligent control unit controls the gas source The generating unit makes the gas source generating unit in the stop working mode; then, the normally closed valve is opened through the intelligent control unit to slowly decrease the gas pressure, so that the gas density relay verified online generates a contact signal action, and the contact signal action passes The on-line calibration contact signal sampling unit is transmitted to the intelligent control unit, and the intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact signal is activated, or directly obtains the gas density value, and detects the gas density relay that is calibrated online Contact signal action value, complete the verification of the contact signal action value of the gas density relay;

When all the contact signal verification work is completed, the intelligent control unit first closes the normally closed valve, and then opens the normally open valve.

Preferably, an online verification method for an online verification device of a gas density relay includes:

In normal working condition, the normally open valve of the online calibration device is open, and the normally closed valve is closed. The online calibration device monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit; online calibration The tested gas density relay monitors the gas density value in electrical equipment;

The online calibration contact signal sampling unit is adjusted to the calibration state through the intelligent control unit. In the calibration state, the online calibration contact signal sampling unit cuts off the contact signal control circuit of the gas density relay that is verified online, and the online calibration is performed. The contact of the tested gas density relay is connected to the intelligent control unit;

Close the normally open valve through the intelligent control unit;

The gas source normally closed valve is opened through the intelligent control unit, and then the intelligent control unit controls the gas source generating unit to enable the gas source generating unit to open the working mode and provide the gas source required for online verification. When the gas pressure of the gas source reaches its When the threshold is preset, the intelligent control unit closes the gas source normally closed valve, and the intelligent control unit controls the gas source generating unit so that the gas source generating unit is in the stop working mode; then, the normally closed valve is opened by the intelligent control unit to make the gas The pressure drops slowly, causing the gas density relay to be verified online to generate contact signal action. The contact signal action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the pressure value and temperature value when the contact signal acts Gas density value, or directly obtain the gas density value, detect the contact signal action value of the gas density relay verified online, and complete the verification work of the contact signal action value of the gas density relay;

Through the intelligent control unit, the normally closed valve is closed first, and then the air source normally closed valve is opened. Then, the intelligent control unit controls the air source generating unit to open the working mode of the air source generating unit, so that the gas pressure rises slowly, so that the online calibration The tested gas density relay generates contact signal reset. The contact signal reset is transmitted to the intelligent control unit through the online calibration contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact signal is reset, or directly obtains the gas Density value, detect the return value of the contact signal of the gas density relay verified online, and complete the verification of the return value of the contact signal of the gas density relay verified online;

When all the contact signal verification work is completed, the operation is resumed to the normal working state through the control of the intelligent control unit: the gas source generating unit is in the stop working mode, the gas source normally closed valve and the normally closed valve are in the closed state, and the normally closed valve is closed. The valve is open; at the same time, the intelligent control unit adjusts the online check contact signal sampling unit to the working state, and the contact signal control loop of the gas density relay checked online resumes operation to the normal working state.

Preferably, the intelligent control unit obtains the gas density value P ₂₀ collected by the gas density detection sensor. If the gas density value P ₂₀ ≥ a preset threshold, the intelligent control unit controls and opens the normally closed valve to reduce the gas pressure, and at the same time , The intelligent control unit sends out an abnormal signal and/or information of excessive pressure; or, the intelligent control unit obtains the gas pressure value P collected by the gas density detection sensor, and if the pressure value P ≥ a preset threshold, the intelligent control unit controls and Open the normally closed valve to reduce the gas pressure, and at the same time, the intelligent control unit sends out an abnormal signal and/or message of excessive pressure.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, or the gas density detection sensor adopts a gas density transmitter composed of a pressure sensor and a temperature sensor; the online verification method also include:

When the normally open valve is in the closed state, the online verification contact signal sampling unit is adjusted to the verification state through the intelligent control unit. In the verification state, the intelligent control unit controls and opens the normally closed valve so that the gas pressure slowly drops to In the zero position, the intelligent control unit receives the pressure signal P ₀ collected by the pressure sensor. If the pressure difference |P ₀ -0|≥ the preset threshold, the intelligent control unit sends out a signal of abnormal zero deviation of the pressure sensor and/or information.

Preferably, the online verification device further includes a gas leakage alarm contact, which is connected in series or in parallel with the alarm contact of the gas density relay to be checked online, and the gas leakage alarm contact is also connected to the intelligent control unit Connected; the online verification method further includes:

In a set period of time, the normally open valve is closed under the control of the intelligent control unit. The intelligent control unit monitors the gas density value P ₂₀ through the gas density detection sensor. Through calculation and processing, it is found that the gas density value P ₂₀ gradually decreases. The control unit sends out the gas leak alarm contact signal or/and information through the gas leak alarm contact; or, the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and the calculation process finds that the gas pressure value P gradually decreases, and the intelligent control unit passes The leak alarm contact sends out a leak alarm contact signal or/and information.

Preferably, the contact signal includes alarm and/or lockout.

Preferably, after the gas density relay verified online has completed the verification, if there is an abnormality, an alarm can be automatically sent out and uploaded to the remote end or sent to a designated receiver.

Preferably, the online verification method further includes: displaying the gas density value and the verification result on the spot, or displaying the gas density value and the verification result through the background.

Preferably, the online verification method further includes: the intelligent control unit is controlled through on-site control, and/or through background control.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The present application provides an online calibration device for gas density relays and an online calibration method thereof, which are used for high-voltage and medium-voltage electrical equipment and gas density relay online calibration. The testing device includes a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generating unit, an online verification contact signal sampling unit and an intelligent control unit. The gas pressure is raised and lowered through the normally open valve, normally closed valve, and gas source generating unit, so that the gas density relay generates contact signal action. The contact signal action is transmitted to the intelligent control unit through the online verification contact signal sampling unit, and the intelligent control unit is based on the contact The density value when the signal is activated, the alarm and/or blocking contact signal action value and/or return value of the gas density relay is detected, and the calibration of the gas density relay can be completed without maintenance personnel on site, which is maintenance-free and greatly improved The reliability of the power grid is improved, work efficiency is improved, and operation and maintenance costs are reduced. In the entire calibration process, this application provides the gas source required for the calibration through the gas source generation unit, without using the SF6 gas of the electrical equipment for calibration, which is environmentally friendly, safe and economical, and in particular, this application can also implement a pressure sensor When the pressure is too high, the pressure can be released to prevent serious problems caused by the high pressure.

Description of the drawings

The drawings constituting a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Fig. 1 is a schematic diagram of the structure of an online verification device for a gas density relay of the first embodiment;

Figure 2 is a schematic diagram of circuit control of the gas density relay online calibration device of the first embodiment;

Figure 3 is a schematic diagram of the structure of the gas density relay online verification device of the second embodiment;

4 is a schematic diagram of the structure of the gas density relay online verification device of the third embodiment;

Figure 5 is a schematic diagram of the structure of the on-line verification device of the gas density relay of the fourth embodiment;

6 is a schematic diagram of the structure of the gas density relay online verification device of the fifth embodiment;

Fig. 7 is a schematic diagram of the structure of an online calibration device for a gas density relay of the sixth embodiment.

Detailed ways

In order to make the objectives, technical solutions, and effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments are only used to explain the present invention, but not used to limit the present invention.

Example one:

As shown in Figure 1, a gas density relay online calibration device includes: a gas density detection sensor composed of a pressure sensor 2, a temperature sensor 3, a normally open valve 4, a gas source generating unit 5, and an online calibration contact signal sampling Unit 6, intelligent control unit 7, multi-way connector 9, normally closed valve 11, flow controller 12, filter 14, moisture treatment agent 15. Wherein, the multi-way connector 9 is provided with a first interface 901, a second interface 902, a third interface 903, a fourth interface 904, and a fifth interface 905 that are connected to each other. The pressure sensor 2 is in communication with the fifth interface 905 of the multi-way connector 9. The gas path of the gas density relay 1 to be verified is in communication with the first interface 901 of the multi-way connector 9. One end of the normally open valve 4 is provided with an interface that communicates with electrical equipment 8, the other end of the normally open valve 4 is connected to the second interface 902 of the multi-way connector 9, and the normally open valve 4 is It is configured to close or open the air circuit of the electrical equipment 8 to complete the air circuit closing of the electrical equipment 8. The gas path of the gas source generating unit 5 is connected to the third interface 903 of the multi-way connector 9 through the filter element 14, and the gas source generating unit 5 provides a gas source for the gas density relay 1 during online calibration. One end of the normally closed valve 11 is connected with one end of the flow controller 12, the other end of the flow controller 12 is connected with the fourth interface 904 of the multi-way connector 9, and the other end of the normally closed valve 11 is connected with The gas phase is connected, and the normally closed valve 11 is configured to close or open the gas path of the gas density relay 1 to be verified connected to the multi-way connector 9 so that the gas density relay 1 to be verified generates a contact signal action. The online verification contact signal sampling unit 6 is respectively connected to the gas density relay 1 and the intelligent control unit 7 to be verified, and is configured to sample the contact signal of the gas density relay 1 to be verified. The intelligent control unit 7 is respectively connected with the normally open valve 4, normally closed valve 11, gas density detection sensor (pressure sensor 2, temperature sensor 3), and flow controller 12 (which can control and adjust the flow online, or set it well No need to adjust the flow rate) is connected to the online verification contact signal sampling unit 6, and is configured to control the closing or opening of the normally open valve 4, control the closing or opening of the normally closed valve 11, pressure value collection and temperature Value collection, and/or gas density value collection, and detection of the contact signal action value and/or contact signal return value when the contact of the gas density relay 1 checked online is activated. In this case, the air source generating unit 5 is one of an air compressor (compressor), an air pump, a pressure generating pump, a booster pump, an electric air pump, or an electromagnetic air pump. In the above embodiment, the normally open valve 4 and the normally closed valve 11 can be various, and cut-off valves can be used, such as ball valves, butterfly valves, gate valves, stop valves, plug valves, butterfly valves, needle valves, diaphragm valves, etc. In the case of a ball valve, the ball valve can be driven to close the air passage of the switch device by rotating the self-sealing valve core, which can be designed flexibly according to actual needs. Normally open valve 4 and normally closed valve 11 are automatic, manual or semi-manual calibration is also possible. In order to better seal, the air source generating unit 5 is sealed in the air source sealed housing 501, and is connected to the intelligent control unit 7 through the air source lead-out line seal 502; the flow controller 12 is sealed in the flow controller sealed housing Inside 1201, it is connected with the intelligent control unit 7 through a flow controller lead-out seal 1202. A moisture treatment agent 15 is also provided on the multi-way joint 9.

The working principle of verification and monitoring of the online verification device of a gas density relay in this embodiment is as follows:

As shown in Figures 1 and 2, in the normal working state, the normally open valve 4 of the online calibration device is in an open state, and the normally closed valve 11 is in a closed state. The air source generating unit 5 is in a non-working mode, and the online calibration The tested gas density relay 1 monitors the gas density value in the electrical equipment 8, while the online verification device monitors the gas density value in the electrical equipment 8 online through the gas density detection sensor and the intelligent control unit 7. The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment 8 according to the pressure sensor 2 and the temperature sensor 3, and obtains the corresponding 20°C pressure value P ₂₀ (that is, the gas density value).

When it is necessary to calibrate the gas density relay 1, if the gas density value P ₂₀ ≥ the set safety calibration density value P _S , the online calibration device or the background will issue an instruction to connect the online calibration contact through the intelligent control unit 7 The signal sampling unit 6 is adjusted to the verification state. In the verification state, the online verification contact signal sampling unit 6 cuts off the contact signal control circuit of the gas density relay 1 and connects the contact of the gas density relay 1 to the intelligent control unit 7. As shown in Figure 2, the normally open valve 4 is closed by the intelligent control unit 7, and then the air source generating unit 5 is controlled by the intelligent control unit 7, so that the air source generating unit 5 opens the working mode to provide the air required for online calibration. source. When the gas pressure of the gas source reaches its preset threshold, the intelligent control unit 7 controls the gas source generating unit 5 so that the gas source generating unit 5 is in a shutdown mode. Then, the normally closed valve 11 is opened through the intelligent control unit 7 and the flow controller 12 is controlled to slowly decrease the gas pressure, so that the gas density relay 1 that is verified online generates a contact signal action, and the contact signal action passes the online verification contact signal The sampling unit 6 is transmitted to the intelligent control unit 7. The intelligent control unit 7 converts the pressure value and temperature value measured when the contact signal is activated into the corresponding pressure value P ₂₀ at 20°C, which is the gas density value, or directly _{The gas density value is obtained, the contact signal action value P D20} of the gas density relay 1 verified online is detected, and the verification of the contact signal action value of the gas density relay 1 is completed.

After the contact action values of the alarm and/or blocking signals of the gas density relay 1 are all detected, the normally closed valve 11 is closed by the intelligent control unit 7, and then the gas source generating unit 5 is controlled by the intelligent control unit 7 to make the gas source The generating unit 5 turns on the working mode to slowly increase the gas pressure, so that the contact signal of the gas density relay 1 verified online is reset, and the contact signal reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 Obtain the gas density value according to the pressure value and temperature value when the contact signal is reset, or directly obtain the gas density value, and detect the return value of the alarm and/lock contact signal of the gas density relay 1 verified online, and complete the online calibration The verification work of the contact signal return value of the tested gas density relay 1. Repeat the calibration for many times (for example, 2 to 3 times), and then calculate the average value, thus completing the calibration work of the gas density relay 1.

Then, through the control of the intelligent control unit 7, the operation is resumed to the normal working state: the gas source generating unit 5 is in the stop working mode; the normally closed valve 11 is in the closed state; the normally open valve 4 is opened by the intelligent control unit 7 to make the gas density The relay 1 is connected to the electrical equipment 8 on the gas circuit; at the same time, the intelligent control unit 7 also adjusts the online check contact signal sampling unit 6 to the working state, and the contact signal control loop of the gas density relay 1 checked online resumes operation to In a normal working state, the density monitoring loop of the gas density relay 1 works normally, and the gas density relay 1 safely monitors the gas density of the electrical equipment 8 so that the gas equipment 8 can work safely and reliably. In this way, it is convenient to complete the online verification work of the gas density relay 1, and at the same time, the safe operation of the electrical equipment 8 will not be affected when the gas density relay 1 is verified online.

_{Because the gas density relay 1 has already monitored and judged the gas density value P 20} ≥ the set safety verification density value P _S before starting the calibration, the gas of the electrical equipment 8 is within the safe operation range, and the gas leakage It is a slow process, and it is safe to verify.

As shown in Figure 2, the online verification device also includes a leak alarm contact 17. Within a set period of time, such as 2h (hours), the normally open valve 4 is closed under the control of the intelligent control unit 7, and the intelligent control unit 7 monitors the gas density through the gas density detection sensor (pressure sensor 2, temperature sensor 3) With the value P ₂₀ , it is found through calculation and processing that the gas density value gradually decreases. The intelligent control unit 7 sends out a gas leak alarm contact signal or/and information, and the intelligent control unit 7 uploads the gas leak alarm contact signal or/and information to the background. Wherein, the gas leakage alarm contact 17 is connected in parallel with the alarm contact of the gas density relay 1 that is checked online (for normal density, the contact is a normally open gas density relay); or, the gas leakage alarm contact 17 is connected in series On the alarm contact of the gas density relay 1 that is checked online (when the density is normal, the contact is a normally closed gas density relay). For further explanation, the gas leakage alarm contact 17 is connected in parallel with the alarm contact PJ of the gas density relay that is checked online (for normal density, the contact is a normally open gas density relay), at 8 o'clock in the morning one day, The gas density relay online calibration device closes the normally open valve 4 under the control of its intelligent control unit 7, and then the gas density value P ₂₀ monitored by the intelligent control unit 7 through the gas density detection sensor (pressure sensor 2, temperature sensor 3) is 0.622MPa. _{One hour later, at 9 o'clock in the morning, the gas density value P 20} monitored by the intelligent control unit 7 through the gas density detection sensor (pressure sensor 2, temperature sensor 3) is 0.612 MPa, and the intelligent control unit 7 finds the gas through calculation The density value decreases by 0.01 MPa within one hour, and the change of the gas density value exceeds the preset threshold, the intelligent control unit 7 drives the gas leak alarm contact 17 to close (in this case, it is closed or it can be opened), and then issued Air leakage alarm contact signal or/and information, and at the same time, the leakage information of the gas density relay online verification device is transmitted to the background through the intelligent control unit 7, and then the normally open valve 4 is opened under the control of the intelligent control unit 7 . In this way, the gas density relay online calibration device has a gas leakage self-diagnosis function, which can detect the gas leakage problem in time, so that the gas density relay online calibration device can better serve the field application and make the power grid more reliable and safe. In addition, the gas pressure value P monitored by the intelligent control unit 7 through the gas density detection sensor, and the gas pressure value is gradually reduced through calculation processing, the intelligent control unit 7 sends out a gas leak alarm contact signal or/and information.

When calibrating the gas density relay (or during the zero calibration of the pressure sensor), when the intelligent control unit 7 confirms that the normally open valve 4 is in the closed state, at this time (or through) the intelligent control unit 7 has checked online The contact signal sampling unit 6 is adjusted to the calibration state, that is, in the calibration state, the intelligent control unit 7 controls and opens the normally closed valve 11, so that the gas pressure of the gas path connected to the multi-way connector slowly drops to zero. The intelligent control unit 7 receives the pressure signal P ₀ collected by the pressure sensor 2, and if the pressure difference |P ₀ -0|≥ the preset threshold, the intelligent control unit 7 sends out a signal and/or information that the zero deviation of the pressure sensor is abnormal .

The intelligent control unit 7 obtains the gas density value P ₂₀ collected by the gas density detection sensor. If the density value P ₂₀ ≥ a preset threshold, the intelligent control unit 7 controls and opens the normally closed valve 11 to reduce the gas pressure and prevent electrical The device 8 may cause serious accidents such as explosion due to excessive pressure, and the intelligent control unit 7 sends out an abnormal signal and/or information of excessive pressure; for example, the intelligent control unit 7 can pass the abnormal signal of excessive pressure through the alarm signal of the gas density relay 1 The loop is uploaded to the background, so that the operation and maintenance personnel can know and can deal with the problem in time to prevent the expansion of the problem. Alternatively, the intelligent control unit 7 obtains the gas pressure value P collected by the gas density detection sensor. If the pressure value P ≥ a preset threshold, the intelligent control unit 7 controls and opens the normally closed valve 11 to reduce the gas pressure and prevent electrical In the event of a serious accident such as an explosion in the equipment 8, the intelligent control unit 7 sends out abnormal signals and/or information of excessive pressure, so that the operation and maintenance personnel can detect and deal with the accident in time, and ensure the safe and reliable operation of the power grid.

In this embodiment, the multi-way joint 9 is further provided with a moisture treatment agent 15, and the moisture treatment agent 15 is arranged in the cavity of the multi-way joint 9. Preferably, the moisture treatment agent 15 is selected from adsorbents, A kind of desiccant. For example, alumina molecular sieve (also known as activated alumina desiccant) can be used to make the moisture of the online calibration device very small, and to ensure that the moisture of the electrical equipment 8 will not increase or exceed the standard during the online calibration process, but also Its moisture is reduced. The design principle of the moisture treatment agent 15 is to facilitate on-site replacement. A cavity (appropriately large hole) can be provided on the multi-way joint 9, and then the moisture treatment agent 15 can be fixed on a closed joint. The closed joint fixes the moisture treatment agent 15 in the cavity of the multi-way joint 9 so that it can be replaced in time within a certain period of time. In this embodiment, the air path of the air source generating unit 5 is communicated with the third interface 903 of the multi-way connector 9 through the filter element 14. The filter element 14 may be a filter mesh, a filter element, or a filter. Kind of. In this case, a filter screen is used to ensure that the gas of the electrical equipment 8 will not be polluted during the online calibration process, and ensure the safe and reliable operation of the electrical equipment 8.

The types of the above-mentioned pressure sensors 2 include absolute pressure sensors, relative pressure sensors, or absolute pressure sensors and relative pressure sensors, and the number can be several. The pressure sensor can be in the form of diffused silicon pressure sensor, MEMS pressure sensor, chip pressure sensor, coil induction pressure sensor (such as a pressure measurement sensor with an induction coil in a Baden tube), and a resistance pressure sensor (such as a Baden tube with a slip wire resistance). Pressure measuring sensor). It can be an analog pressure sensor or a digital pressure sensor. Pressure collection is a variety of pressure-sensitive components such as pressure sensors and pressure transmitters, such as diffused silicon type, sapphire type, piezoelectric type, strain gauge type (resistance strain gauge type, ceramic strain gauge type).

The above-mentioned temperature sensor 3 may be a thermocouple, a thermistor, or a semiconductor type; it may be a contact type or a non-contact type; it may be a thermal resistance or a thermocouple. In short, temperature collection can use various temperature sensing elements such as temperature sensors and temperature transmitters.

The above-mentioned online verification contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay 1. That is, the basic requirements or functions of the online calibration contact signal sampling unit 6 are: 1) During the calibration, the safe operation of the electrical equipment 8 will not be affected, that is, during the calibration, the contact signal of the gas density relay 1 will not Affect the safe operation of electrical equipment 8; 2) The contact signal control circuit of the gas density relay 1 does not affect the performance of the gas density relay 1, especially the performance of the intelligent control unit 7, and will not cause the gas density relay 1 to be damaged, or Affect the test work.

The basic requirement or function of the above-mentioned intelligent control unit 7 is that the control and signal acquisition of the normally open valve 4, the normally closed valve 11, the air source generating unit 5, and the flow controller 12 are completed by the intelligent control unit 7. Realization: The pressure value and temperature value when the contact signal of the gas density relay 1 is activated can be detected, and converted into the corresponding pressure value P ₂₀ (density value) at 20°C, that is, the contact action of the gas density relay 1 can be detected With a value of P _D20 , the calibration of the gas density relay 1 is completed. _{Alternatively, the density value P D20} when the contact signal of the gas density relay 1 is activated can be directly detected, and the verification work of the gas density relay 1 can be completed. At the same time, through the test of the rated pressure value of the gas density relay 1, the self-checking work between the gas density relay 1, the pressure sensor 2, and the temperature sensor 3 can be completed, and maintenance-free is realized. Of course, the intelligent control unit 7 can also realize: complete test data storage; and/or test data export; and/or test data can be printed; and/or can communicate with the host computer; and/or can input analog and digital量信息。 Volume information. The intelligent control unit 7 also includes a communication module, which realizes remote transmission of test data and/or verification results and other information through the communication module; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously Collect the density value at that time, and complete the calibration of the rated pressure value of the gas density relay 1.

Electrical equipment 8, including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment 8 may include GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas filling cabinets, ring network cabinets, and so on.

The gas density detection sensor, the normally open valve 4, the normally closed valve 11, the gas source generating unit 5, the flow controller 12, the online verification contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly set as required. For example, the pressure sensor 2 and the temperature sensor 3 can be arranged together; the pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6 and the intelligent control unit 7 can be arranged together. In short, the settings between them can be arranged and combined flexibly.

When the gas density relay 1 completes the calibration work, the online calibration device makes a judgment and can announce the detection result. The method is flexible, specifically: 1) The online verification device can be displayed on-site, such as display by indicator light, digital or liquid crystal, etc.; 2) The online verification device can be uploaded through online remote communication, for example, it can be uploaded. To the background of the online monitoring system; 3) or upload via wireless upload to a specific terminal, such as wireless upload to a mobile phone; 4) or upload via other channels; 5) or upload abnormal results through the alarm signal line or dedicated signal line ; 6) Upload alone or bundled with other signals to upload. In short, after the online verification device completes the online verification of the gas density relay, if there is an abnormality, it can automatically send an alarm, which can be uploaded to the remote end, or can be sent to a designated receiver, such as a mobile phone. Or, after the online verification device completes the verification of the gas density relay, if there is an abnormality, the intelligent control unit 7 can upload the remote end (monitoring room, background monitoring platform, etc.) through the alarm contact signal of the gas density relay 1, and also Display notices on the spot. The simple version of the gas density relay online calibration can upload the abnormal results of the calibration through the alarm signal line. It can be uploaded according to a certain rule. For example, when there is an abnormality, connect a contact in parallel with the alarm signal contact to regularly close and disconnect, and the status can be obtained through analysis; or upload through an independent calibration signal line. Specifically, it can be uploaded in good condition, or there is a problem, or it can be uploaded through remote transmission density online monitoring, or the verification result can be uploaded through a separate verification signal line, or through local display, local alarm, or through wireless upload, Online upload with smart phone. The communication method is wired or wireless. The wired communication method can be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; The wireless communication method can be 2G/3G/4G/5G, etc., WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, sensor built-in 5G/NB-IOT communication module (such as NB-IOT) and so on. In short, multiple methods and multiple combinations can be used to fully ensure the reliable performance of the gas density relay.

The online verification device has a safety protection function. Specifically, when the value is lower than the set value, the online verification device will automatically no longer perform online verification on the density relay, but will send out a notice signal. For example, when the gas density value of electrical equipment is less than the set value P _S , online verification is not performed. Only when the gas density value of electrical equipment ≥ (alarm pressure value + 0.02MPa) can online verification be performed.

The online verification device can repeat the verification multiple times (for example, 2 to 3 times), and calculate the average value according to the verification result of each time. When necessary, the gas density relay can be checked online at any time. At the same time, the online calibration device can also monitor the gas density value, and/or pressure value, and/or temperature value of the electrical equipment online, and upload it to the target device for online monitoring.

Embodiment two:

As shown in Figure 3, a gas density relay online calibration device includes: pressure sensor 2, temperature sensor 3, normally open valve 4, gas source generating unit 5, online calibration contact signal sampling unit 6, intelligent control unit 7 , Multi-way connector 9, air source normally closed valve 10, normally closed valve 11, flow controller 12, filter 14, moisture treatment agent 15. The difference between this embodiment and the first embodiment is that an air source normally closed valve 10 and a filter 14 are added between the air source generating unit 5 and the multi-way joint 9. The air source normally closed valve 10 is sealed in the air source normally closed valve Inside the sealed housing 101, the air source normally closed valve lead-out seal 102 is connected to the intelligent control unit 7; the normally open valve 4 is sealed in the normally open valve sealing housing 41, and the normally open valve lead-out seal 42 is connected to the intelligent control unit 7 The intelligent control unit 7 is connected; the normally closed valve 11 is sealed in the normally closed valve sealing housing 1101, and is connected to the intelligent control unit 7 through the normally closed valve lead-out seal 1102.

The working principle of the verification and monitoring of this embodiment is as follows: You can refer to the first embodiment. In the normal working state, the normally open valve 4 of the online verification device is in the open state, the normally closed valve 11 is in the closed state, and the online verification device passes gas The density detection sensors (pressure sensor 2 and temperature sensor 3) and the intelligent control unit 7 monitor the gas density value in the electrical equipment 8 online; the gas density relay 1 verified online monitors the gas density value in the electrical equipment 8. The online calibration device according to the set calibration time or/and calibration instructions, and the gas density value, when the gas density relay is allowed to be checked: adjust the online calibration contact signal sampling unit 6 through the intelligent control unit 7 In the verification state, in the verification state, the online verification contact signal sampling unit 6 cuts off the contact signal control circuit of the gas density relay 1 verified online, and connects the contact of the gas density relay 1 verified online to the smart Control unit 7; close the normally open valve 4 through the intelligent control unit 7; open the air source normally closed valve 10 through the intelligent control unit 7, and then the intelligent control unit 7 controls the air source generating unit 5 so that the air source generating unit 5 is turned on Mode, providing the gas source required for online verification. When the gas pressure of the gas source reaches its preset threshold, the intelligent control unit 7 closes the gas source normally closed valve 10, and the intelligent control unit 7 then controls the gas source generating unit 5 to make The gas source generating unit 5 is in the stop working mode; then, the normally closed valve 11 is opened through the intelligent control unit 7. Due to the function of the flow controller 12 (which can also be set on the left side of the normally closed valve 11), the gas The pressure drops slowly, causing the gas density relay 1 checked online to generate a contact signal action. The contact signal action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 acts according to the pressure value of the contact signal. , The temperature value obtains the gas density value, or directly obtains the gas density value, detects the contact signal action value of the gas density relay 1 verified online, and completes the verification of the contact signal action value of the gas density relay 1. Next, the normally closed valve 11 is closed by the intelligent control unit 7, and then the air source normally closed valve 10 is opened by the intelligent control unit 7, and the intelligent control unit 7 then controls the air source generating unit 5 to enable the air source generating unit 5 to open the working mode , Make the gas pressure rise slowly, make the contact signal reset of the gas density relay 1 verified online, and the contact signal reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 resets according to the contact signal Get the gas density value from the pressure value and temperature value, or directly get the gas density value, detect the return value of the contact signal of the gas density relay 1 verified online, and complete the return value of the contact signal of the gas density relay 1 verified online Verification work. When all the contact signal verification work is completed, the operation is resumed to the normal working state through the control of the intelligent control unit 7: the gas source generating unit 5 is in the stop working mode, and the gas source normally closed valve 10 and the normally closed valve 11 are both in In the closed state, the normally open valve 4 is in the open state; at the same time, the intelligent control unit 7 also adjusts the online verification contact signal sampling unit 6 to the working state, and the contact signal control loop of the gas density relay 1 verified online resumes operation to normal Working status.

Embodiment three:

As shown in Figure 4, a gas density relay online calibration device includes: gas density relay 1, pressure sensor 2, temperature sensor 3, normally open valve 4, gas source generating unit 5, online calibration contact signal sampling unit 6 , Intelligent control unit 7, multi-way connector 9, air source normally closed valve 10, normally closed valve 11, flow controller 12, filter element 14, moisture treatment agent 15, and second filter element 16. The difference between this embodiment and the first and second embodiments is: the online verification device described in this embodiment also includes a gas density relay 1, a pressure sensor 2, a temperature sensor 3, an online verification contact signal sampling unit 6, an intelligent control The units 7 are all arranged on the gas density relay 1. In this embodiment, a second filter element 16 is also provided, and the second filter element 16 is arranged on the gas path between the multi-way connector 9 and the normally closed valve 11 to ensure that the gas is clean.

The gas density relay 1 includes a housing, and a base, an end seat, a pressure detector, a temperature compensation element, a number of signal generators, a movement, a pointer, and a dial arranged in the housing. One end of the pressure detector is fixed on the base and communicated with it, the other end of the pressure detector is connected to one end of the temperature compensation element through the end seat, and the other end of the temperature compensation element One end is provided with a cross beam, and the cross beam is provided with an adjusting member that pushes the signal generator and makes the contact of the signal generator turn on or off. The movement is fixed on the base; the other end of the temperature compensation element is also connected to the movement or directly connected to the movement through a connecting rod; the pointer is installed on the movement and Set in front of the dial, the pointer combines with the dial to display the gas density value. The gas density relay 1 may also include a digital device or a liquid crystal device with an indication display. Wherein, the signal generator includes a micro switch or a magnetic-assisted electric contact, the gas density relay 1 outputs a contact signal through the signal generator; the pressure detector includes a Baden tube or a bellows; the temperature The compensation element adopts a temperature compensation sheet or a gas enclosed in the housing. The gas density relay 1 of the present application may further include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge. Since this part belongs to the existing technology, it will not be repeated in detail. The working principle is the same as that of the second embodiment, and will not be repeated here.

Embodiment four:

As shown in Figure 5, a gas density relay online calibration device includes: gas density relay 1, pressure sensor 2, temperature sensor 3, normally open valve 4, gas source generating unit 5, online calibration contact signal sampling unit 6 , Intelligent control unit 7, multi-way connector 9, normally closed valve 11, flow controller 12. This embodiment is the same as the third embodiment. The online verification device of this embodiment also includes the gas density relay 1. The difference is that the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the online verification contact The signal sampling unit 6 and the intelligent control unit 7 are separately arranged together. For its working principle, please refer to the third embodiment, which will not be repeated here.

Embodiment five:

As shown in Figure 6, a gas density relay online calibration device includes: pressure sensor 2, temperature sensor 3, normally open valve 4, gas source generating unit 5, online calibration contact signal sampling unit 6, intelligent control unit 7 , Multi-way connector 9, air source normally closed valve 10, normally closed valve 11, pressure regulating mechanism 13. The biggest difference between this embodiment and Embodiment 1 and Embodiment 2 is that the online verification device of this embodiment also includes a pressure adjusting mechanism 13, which is connected to a multi-way joint 9 through a normally closed valve 11 . The pressure adjusting mechanism 13 mainly includes a pressure adjusting mechanism housing 1301, a cavity 1302, a piston 1303, a driving part 1304, an adjusting rod 1305, and a seal 1306. Specifically, the pressure adjusting mechanism 13 is a cavity 1302 with one end open, the other end of the cavity 1302 is connected to the normally closed valve 11; the cavity 1302 has a piston 1303, and one end of the piston 1303 is connected There is an adjusting rod 1305, the outer end of the adjusting rod 1305 is connected to the driving part 1304, the other end of the piston 1303 extends into the opening, and is in sealing contact with the inner wall of the cavity 1302 through a seal 1306, so The driving component 1304 drives the adjusting rod 1305 to drive the piston 1303 to move in the cavity 1302, so that the volume of the cavity 1302 is changed, and the pressure rises and falls.

The working principle of the verification and monitoring of this embodiment is as follows: You can refer to the first embodiment. In the normal working state, the normally open valve 4 of the online verification device is in the open state, the normally closed valve 11 is in the closed state, and the online verification device passes gas The density detection sensors (pressure sensor 2 and temperature sensor 3) and the intelligent control unit 7 monitor the gas density value in the electrical equipment 8 online; the gas density relay 1 verified online monitors the gas density value in the electrical equipment 8. The online calibration device according to the set calibration time or/and calibration instructions, and the gas density value, when the gas density relay is allowed to be checked: adjust the online calibration contact signal sampling unit 6 through the intelligent control unit 7 In the verification state, in the verification state, the online verification contact signal sampling unit 6 cuts off the contact signal control circuit of the gas density relay 1 verified online, and connects the contact of the gas density relay 1 verified online to the smart Control unit 7; close the normally open valve 4 through the intelligent control unit 7; open the air source normally closed valve 10 through the intelligent control unit 7, and then the intelligent control unit 7 controls the air source generating unit 5 so that the air source generating unit 5 is turned on Mode, providing the gas source required for online verification. When the gas pressure of the gas source reaches its preset threshold, the intelligent control unit 7 closes the gas source normally closed valve 10, and the intelligent control unit 7 then controls the gas source generating unit 5 to make The air source generating unit 5 is in a stop working mode; then, the normally closed valve 11 is opened by the intelligent control unit 7, and the intelligent control unit 7 then controls the pressure adjustment mechanism 13, and the adjustment rod 1305 is driven by the driving component 1304 The piston 1303 moves in the cavity 1302 to change the volume of the cavity 1302 and slowly drop the gas pressure, so that the gas density relay 1 that is checked online generates a contact signal action, and the contact signal action passes the online check. The contact signal sampling unit 6 is transmitted to the intelligent control unit 7, and the intelligent control unit 7 obtains the gas density value according to the pressure value and temperature value when the contact signal is activated, or directly obtains the gas density value, and detects the gas density relay 1 checked online The contact signal action value of the gas density relay 1 completes the verification of the contact signal action value of the gas density relay 1. Then, the intelligent control unit 7 controls the pressure adjusting mechanism 13, and the adjusting rod 1305 is driven by the driving member 1304 to drive the piston 1303 to move in the cavity 1302, so that the volume of the cavity 1302 is changed, so that The gas pressure rises slowly, causing the contact signal reset of the gas density relay 1 checked online. The contact signal reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 is reset according to the pressure when the contact signal is reset. Value, temperature value to obtain the gas density value, or directly obtain the gas density value, detect the return value of the contact signal of the gas density relay 1 verified online, and complete the calibration of the return value of the contact signal of the gas density relay 1 verified online Test work. When all the contact signal verification work is completed, the operation is resumed to the normal working state through the control of the intelligent control unit 7: the air source generating unit 5 and the pressure regulating mechanism 13 are in the stop working mode, and the air source normally closed valve 10 and the normal The closing valve 11 is in the closed state, and the normally open valve 4 is in the open state; at the same time, the intelligent control unit 7 also adjusts the online verification contact signal sampling unit 6 to the working state, and controls the contact signal of the gas density relay 1 verified online The circuit resumes operation to normal working condition.

Embodiment 6:

As shown in Figure 7, a gas density relay online calibration device includes: pressure sensor 2, temperature sensor 3, normally open valve 4, gas source generating unit 5, online calibration contact signal sampling unit 6, intelligent control unit 7 , Multi-way connector 9, normally closed valve 11, pressure regulating mechanism 13. The biggest difference between this embodiment and the fifth embodiment is that the pressure adjustment mechanism 13 of the online verification device in this embodiment mainly includes a pressure adjustment mechanism housing 1301, a driving component 1304, an airbag 1307, and a push rod 1308. Specifically, the pressure adjustment mechanism is an airbag 1307 with one end connected to a driving part. The airbag 1307 changes its volume under the driving of the driving part 1304 and the push rod 1308. The airbag 1307 communicates with the multi-way joint 9 and Gas density relay 1. For its working principle, please refer to the fifth embodiment, which will not be repeated here.

In a preferred embodiment, the online calibration device may have several pressure sensors and temperature sensors, and the pressure values monitored by the multiple pressure sensors can be compared and mutually verified. The temperature values obtained by the multiple temperature sensors Comparison and mutual verification can be carried out, and the corresponding multiple gas density values monitored by multiple pressure sensors and multiple temperature sensors can be compared and mutually verified.

In another preferred embodiment, the online verification device may also include a gas density relay 1.

In summary, the gas density relay online calibration device provided by this application has the main function of performing online calibration measurement on the contact signal of the gas density relay (pressure value during alarm/locking action) at ambient temperature, and It is automatically converted into the corresponding pressure value at 20°C, and the performance detection of the contact (alarm and lockout) value of the gas density relay is realized online. The installation positions of the gas density relay, pressure sensor, temperature sensor, normally open valve, normally closed valve, online calibration contact signal sampling unit, and intelligent control unit can be combined flexibly. For example: gas density relay, pressure sensor, temperature sensor, online calibration contact signal sampling unit, intelligent control unit can be combined together, integrated design, can also be separated design; can be installed on the shell, or on the multi-way connector , Can also be connected together by connecting pipes. The normally open valve can be directly connected to electrical equipment, or can be connected through a self-sealing valve or a gas pipe. Pressure sensor, temperature sensor, online calibration contact signal sampling unit, intelligent control unit can be combined together, integrated design; pressure sensor, temperature sensor can also be combined together, integrated design; online calibration contact signal sampling unit can also be used , Intelligent control units are combined together and integrated design. In short, the structure is eclectic. The multi-way connector is provided with a first interface, a second interface, a third interface, and a fourth interface that are connected to each other. Two or more of these interfaces can be combined for simplified and flexible design.

The online calibration device can perform online calibration according to the set time, or according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). For online calibration of high temperature, low temperature, normal temperature, and 20℃ ambient temperature, the error judgment requirements are different. For example, when checking the 20℃ ambient temperature, the accuracy requirement of the gas density relay can be 1.0 or 1.6, high temperature Time can be 2.5 levels. Specifically, it can be implemented according to temperature requirements and related standards. For example, in accordance with the 4.8 temperature compensation performance regulations in DL/T 259 "Sulfur hexafluoride Gas Density Relay Calibration Regulations", each temperature value corresponds to the accuracy requirements. The online calibration device can compare the error performance of the density relay at different temperatures and time periods. That is to compare the performance of gas density relays and electrical equipment in different periods and within the same temperature range. It has the comparison of various periods of history, the comparison of history and the present. You can also perform a physical examination on the density relay. When necessary, the contact signal of the density relay can be checked at any time; whether the density value of the electrical equipment with the gas density relay and the monitored electrical equipment is normal can be judged. That is, the normal and abnormal judgment, analysis and comparison of the density value of the electrical equipment itself, gas density relay, pressure sensor, and temperature sensor can be carried out, so as to realize the judgment, comparison and analysis of the electrical equipment gas density monitoring, density relay and other states; It can also monitor the state of the contact signal of the gas density relay and remotely transmit its state. The contact signal state of the gas density relay can be known in the background: whether it is open or closed, thereby adding a layer of monitoring and improving reliability; it can also detect, or detect and determine the temperature compensation performance of the gas density relay; Detect, or detect and determine the contact resistance of the gas density relay; it can also detect, or detect and determine the insulation performance of the gas density relay. In addition, for SF6 gas, the specific conversion method of SF6 gas pressure-temperature characteristics can be calculated according to the Betty-Bridgeman equation; for SF6 mixed gas, the specific conversion method of SF6 mixed gas pressure-temperature characteristics can be calculated according to Doyle To calculate the partial pressure law, Betty-Bridgeman equation, ideal gas state equation.

The structure of the application is compact and reasonable, each component has good anti-rust and anti-vibration capabilities, firm installation, reliable use, easy operation for connection, disassembly and assembly of various pipelines, and convenient maintenance of equipment and components. This application can complete the calibration of the gas density relay without the need for maintenance personnel to go to the site, which greatly improves the reliability of the power grid, improves the efficiency, and reduces the cost. At the same time, during the entire calibration process, the gas source generation unit provides the gas source required for the calibration without using the SF6 gas of the electrical equipment for the calibration, which is environmentally friendly, safe and economical. The products of this technical solution can also be applied to on-site frequent on-line verification of gas density relays to diagnose the performance of gas density, especially to realize the zero calibration diagnosis of pressure sensors, and to release the pressure when the monitoring pressure is too high. To prevent excessive pressure from causing serious problems.

The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention should all fall within the scope of the present invention.

Claims

An online verification device for a gas density relay, which is characterized by comprising: a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generating unit, an online verification contact signal sampling unit and an intelligent control unit;

The gas density detection sensor is in communication with the multi-way connector;

The multi-way connector is provided with a first interface, a second interface, a third interface, and a fourth interface that are connected to each other, wherein the first interface is connected to the gas density relay;

One end of the normally open valve is provided with an interface that communicates with electrical equipment, and the other end of the normally open valve is connected to the second interface of the multi-way connector; the normally open valve is configured to turn off or turn on electrical equipment. The air circuit of the equipment, complete the air circuit closing of the electrical equipment;

The gas path of the gas source generating unit is connected to the third interface of the multi-way connector; the gas source generating unit is configured to provide a gas source when the gas density relay is checked online;

One end of the normally closed valve is connected to the fourth port of the multi-way connector, and the other end of the normally closed valve is connected to the atmosphere; the normally closed valve is configured to be closed or open to be connected to the multi-way connector The gas circuit of the gas density relay causes the gas density relay to generate a contact signal action;

The online verification contact signal sampling unit is connected to the gas density relay to be verified online, and is configured to sample the contact signal of the gas density relay;

The intelligent control unit is respectively connected with the normally open valve, normally closed valve, gas density detection sensor and the online verification contact signal sampling unit, and is configured to control the closing or opening of the normally open valve, and control Closing or opening of the normally closed valve, pressure value collection and temperature value collection, and/or gas density value collection, and detection of the contact signal action value and/or contact signal return value of the gas density relay;

Wherein, the contact signal includes alarm and/or lockout.
The gas density relay online calibration device according to claim 1, characterized in that it further comprises a flow controller, the flow controller is in communication with the other end of the normally closed valve; or, the flow controller is provided Between the multi-way connector and the normally closed valve; the flow controller is configured to control the flow of the gas.
The gas density relay online verification device according to claim 1, wherein the gas source generating unit includes one of a compressor, an air pump, a pressure generating pump, a booster pump, an electric air pump, and an electromagnetic air pump.
The gas density relay online calibration device according to claim 1, further comprising a gas source normally closed valve, the gas source normally closed valve being arranged between the multi-way connector and the gas source generating unit.
The gas density relay online calibration device according to claim 1, characterized in that it further comprises a filter element, and the filter element is arranged in connection with a normally open valve, or a normally closed valve, or a multi-way joint, or a gas source generating unit. Connected gas road.
The gas density relay online calibration device according to claim 1, characterized in that it further comprises a moisture treatment agent, the moisture treatment agent is arranged on the multi-way connector or the gas source generating unit; the moisture treatment agent includes One of adsorbent and desiccant.
The gas density relay online verification device according to claim 1, characterized in that it further comprises a gas leakage alarm contact, the gas leakage alarm contact is connected in series or in parallel with the alarm contact of the gas density relay to be checked online, so The air leakage alarm contact is also connected with the intelligent control unit.
The gas density relay online calibration device according to claim 1, further comprising a pressure adjusting mechanism, the pressure adjusting mechanism is in communication with the other end of the normally closed valve; the pressure adjusting mechanism is configured as Adjust the pressure rise and fall of the gas.
The gas density relay online calibration device according to claim 8, characterized in that: during calibration, the pressure adjusting mechanism is a closed gas chamber, the closed gas chamber is connected to the normally closed valve, and the closed gas The outside or inside of the chamber is provided with a heating element and/or a refrigerating element, and heating by the heating element and/or cooling by the refrigerating element causes the gas temperature in the airtight chamber to change, thereby completing the online verification The pressure rise and fall of the gas density relay; or,

The pressure adjusting mechanism is a cavity with one end open, the other end of the cavity communicates with the normally closed valve, a piston is inside the cavity, and one end of the piston is connected with an adjusting rod. One end 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,

The pressure regulating mechanism is a closed air chamber, the closed air chamber is connected to the normally closed valve, the closed air chamber is provided with a piston inside, and the piston is in sealing contact with the inner wall of the closed air chamber. A driving part is provided on the outside of the airtight chamber, and the driving part pushes the piston to move in the cavity by electromagnetic force; or,

The pressure adjusting mechanism is an airbag with one end connected to a driving member, the airbag changes in volume under the driving of the driving member, and the airbag communicates with the normally closed valve; or,

The pressure adjusting mechanism is a bellows, one end of the bellows is connected to the normally closed valve, and the other end of the bellows is driven by a driving component to expand and contract;

Wherein, the drive component includes one of a magnetic drive mechanism, a motor, a reciprocating motion mechanism, a Carnot cycle mechanism, and a pneumatic element.
The gas density relay online calibration device according to claim 1, wherein the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, and the pressure sensor is installed on the gas path of the gas density relay for online calibration. , The temperature sensor is installed on or outside the gas circuit of the gas density relay for online verification, or installed in the gas density relay for online verification, or installed outside the gas density relay for online verification; or, the gas density The detection sensor adopts a gas density transmitter composed of a pressure sensor and a temperature sensor; or, the gas density detection sensor adopts a density detection sensor of quartz tuning fork technology.
The gas density relay online verification device according to claim 1, wherein the online verification contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a normally open valve or an intelligent control unit; In the non-verification state, the online verification contact signal sampling unit is relatively isolated on the circuit by isolating the sampling element and the contact signal of the gas density relay; in the verification state, the online verification contact signal sampling unit conducts isolation sampling The component cuts off the contact signal control circuit of the gas density relay, and connects the contact of the gas density relay to the intelligent control unit; wherein, the isolation sampling component includes a travel switch, a micro switch, a button, an electric switch, a displacement switch, and an electromagnetic One of relays, optocouplers, and silicon controlled rectifiers.
The gas density relay online verification device according to claim 1, characterized in that it further comprises a gas density relay, the gas density relay comprises a housing, and a base, a pressure detector, and a temperature sensor arranged in the housing. Compensation element, at least one signal generator; wherein, the signal generator includes a micro switch or a magnetic-assisted electrical contact, the gas density relay outputs a contact signal through the signal generator; the pressure detector includes a Baden Pipe or bellows; the temperature compensation element adopts a temperature compensation sheet or a gas enclosed in a shell.
The gas density relay online verification device according to claim 12, wherein the gas density detection sensor is arranged on the multi-way connector; or the gas density detection sensor is arranged on the gas density relay.
The gas density relay online verification device according to claim 12, wherein the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.
The gas density relay online verification device according to claim 1, wherein the intelligent control unit further comprises a communication module that realizes remote transmission of test data and/or verification results, and the communication mode of the communication module It is wired communication or wireless communication.
An online verification method for a gas density relay online verification device according to claim 1, characterized in that it comprises: in a normal working state, the normally open valve of the online verification device is in an open state, and the normally closed valve is in a closed state. Status, the gas density relay checked online monitors the gas density value in the electrical equipment;

The online calibration device, according to the set calibration time or/and calibration instructions, and the gas density value, under the condition that the gas density relay is allowed to be calibrated:

Close the normally open valve through the intelligent control unit;

The gas source generating unit is controlled by the intelligent control unit to enable the gas source generating unit to turn on the working mode to provide the gas source required for online verification. When the gas pressure of the gas source reaches its preset threshold, the intelligent control unit controls the gas source The generating unit makes the gas source generating unit in the stop working mode; then, the normally closed valve is opened through the intelligent control unit to slowly decrease the gas pressure, so that the gas density relay verified online generates a contact signal action, and the contact signal action passes The on-line calibration contact signal sampling unit is transmitted to the intelligent control unit, and the intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact signal is activated, or directly obtains the gas density value, and detects the gas density relay that is calibrated online Contact signal action value, complete the verification of the contact signal action value of the gas density relay;

When all the contact signal verification work is completed, the intelligent control unit first closes the normally closed valve, and then opens the normally open valve.
The online verification method of an online verification device for a gas density relay according to claim 16, characterized in that it comprises: in a normal working state, the normally open valve of the online verification device is in an open state, and the normally closed valve is in a closed state. Status, the online calibration device monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit; the gas density relay that is calibrated online monitors the gas density value in the electrical equipment;

The online calibration device, according to the set calibration time or/and calibration instructions, and the gas density value, under the condition that the gas density relay is allowed to be calibrated:

The online calibration contact signal sampling unit is adjusted to the calibration state through the intelligent control unit. In the calibration state, the online calibration contact signal sampling unit cuts off the contact signal control circuit of the gas density relay that is verified online, and the online calibration is performed. The contact of the tested gas density relay is connected to the intelligent control unit;

Close the normally open valve through the intelligent control unit;

The gas source normally closed valve is opened through the intelligent control unit, and the intelligent control unit controls the gas source generating unit to enable the gas source generating unit to open the working mode and provide the gas source required for online verification. When the gas pressure of the gas source reaches its preset value When the threshold is reached, the intelligent control unit closes the gas source normally closed valve, and the intelligent control unit controls the gas source generating unit to put the gas source generating unit in the stop working mode; then, the normally closed valve is opened through the intelligent control unit to slowly drop the gas pressure. Makes the gas density relay verified online to generate contact signal action, and the contact signal action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact signal is activated. Or directly obtain the gas density value, detect the contact signal action value of the gas density relay verified online, and complete the verification of the contact signal action value of the gas density relay;

Through the intelligent control unit, first close the normally closed valve, and then open the air source normally closed valve. Then, the intelligent control unit controls the air source generating unit to enable the air source generating unit to open the working mode, so that the gas pressure rises slowly, making the online verification The gas density relay generates contact signal reset, and the contact signal reset is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact signal is reset, or directly obtains the gas density value , Detect the return value of the contact signal of the gas density relay verified online, and complete the verification of the return value of the contact signal of the gas density relay verified online;

When all the contact signal verification work is completed, the operation is resumed to the normal working state through the control of the intelligent control unit: the gas source generating unit is in the stop working mode, the gas source normally closed valve and the normally closed valve are in the closed state, and the normally closed valve is closed. The valve is open; at the same time, the intelligent control unit adjusts the online check contact signal sampling unit to the working state, and the contact signal control loop of the gas density relay checked online resumes operation to the normal working state.
The online verification method of an online verification device for a gas density relay according to claim 16 or 17, characterized by comprising: the intelligent control unit acquiring the gas density value P 20 collected by the gas density detection sensor, If the gas density value P 20 ≥ the preset threshold, the intelligent control unit controls and opens the normally closed valve to reduce the gas pressure, and at the same time, the intelligent control unit sends out abnormal signals and/or information of excessive pressure; or, the intelligent control unit obtains The gas pressure value P collected by the gas density detection sensor. If the pressure value P ≥ the preset threshold, the intelligent control unit controls and opens the normally closed valve to reduce the gas pressure. At the same time, the intelligent control unit sends out an abnormal signal of excessive pressure and/ Or information.
The online verification method of an online verification device for a gas density relay according to claim 16 or 17, wherein the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor, or the gas The density detection sensor adopts a gas density transmitter composed of a pressure sensor and a temperature sensor; the online calibration method also includes: when the normally open valve is in the closed state, the online calibration contact signal sampling unit is adjusted through the intelligent control unit To the verification state, in the verification state, the intelligent control unit controls and opens the normally closed valve, so that the gas pressure slowly drops to zero, the intelligent control unit receives the pressure signal P 0 collected by the pressure sensor, if the pressure If the difference |P 0 -0|≥the preset threshold value, the intelligent control unit sends out a signal and/or information that the zero deviation of the pressure sensor is abnormal.
The online verification method of the gas density relay online verification device according to claim 16 or 17, wherein the online verification device further comprises a gas leakage alarm contact, and the gas leakage alarm contact is connected in series or in parallel On the alarm contact of the gas density relay to be checked online, the gas leakage alarm contact is also connected to the intelligent control unit; the online verification method further includes: in a set time period, the intelligent control unit The normally open valve is closed under the control of, the intelligent control unit monitors the gas density value P 20 through the gas density detection sensor, and the calculation process finds that the gas density value P 20 gradually becomes smaller, and the intelligent control unit sends out a leak alarm contact signal through the leak alarm contact Or/and information; or, the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and finds that the gas pressure value P gradually decreases through calculation processing, and the intelligent control unit sends out a gas leak alarm contact signal through the gas leak alarm contact or/and information.