CN211318085U

CN211318085U - On-site detection device and system for realizing maintenance-free gas density relay

Info

Publication number: CN211318085U
Application number: CN201921457441.9U
Authority: CN
Inventors: 常敏; 金海勇; 郭正操; 王乐乐; 曾伟; 廖海明
Original assignee: Shanghai Roye Electric Science and Technology Co Ltd
Current assignee: Shanghai Roye Electric Science and Technology Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-08-21
Anticipated expiration: 2029-09-04

Abstract

The application provides a realize gaseous density relay non-maintaining field detection device and system, control the unit including temperature regulation mechanism and intelligence, control the temperature lift of unit control temperature regulation mechanism through the intelligence to the temperature lift of the temperature compensation component that makes density relay accomplishes the witnessed inspections to gaseous density relay, need not maintainer to field operation, realized the non-maintaining to gaseous density relay, improved the reliable safe operation of efficiency and electric wire netting greatly.

Description

On-site detection device and system for realizing maintenance-free gas density relay

Technical Field

The utility model relates to an electric power tech field especially relates to an use realization gas density relay non-maintaining's on-the-spot detection device and system on high-voltage electric equipment.

Background

The gas density relay is used for monitoring and controlling the density of insulating gas in high-voltage and medium-voltage electrical equipment, a contact signal control loop is arranged in the gas density relay, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage and medium-voltage electrical equipment, when gas leakage is detected, a contact of the gas density relay acts to generate a contact signal, and the contact signal control loop gives an alarm or locks according to the contact signal, so that the safe operation protection of the electrical equipment is realized.

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring of the gas density and micro-water content state of the SF6 electrical equipment has important practical significance. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high-voltage electrical equipment is very common, and existing gas density monitoring systems (devices) are basically: 1) The remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage transformer substation is severe, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and when the pressure reaches the state of alarming, locking or overpressure, information is transmitted to a target equipment terminal in time through a contact connecting circuit, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be transmitted to target equipment (such as a computer terminal) in time to realize online monitoring.

The gas density relay on the SF6 electrical equipment is regularly checked, which is a necessary measure for preventing the gas density relay from being in the bud and ensuring the safe and reliable operation of the SF6 electrical equipment; the 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the SF6 gas density relay is very important and popular in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises are implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density relay, so that the gas density relay for realizing the online gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and further regular checking work of the (mechanical) gas density relay is completed, no maintainer is required to arrive at the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro-water value in the gas chamber of the electrical equipment can be accurately measured in the online self-checking gas density relay or a monitoring system consisting of the gas density relay.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an use realization gas density relay non-maintaining on-the-spot detection device and system on high-voltage electrical equipment for when solving the gas density to the electrical equipment of gas insulation or arc extinguishing and monitoring, still accomplish the online check-up to gas density relay, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the application provides a field detection device for realizing maintenance-free gas density relay in a first aspect.

In a second aspect, the present application provides a maintenance-free field test system for a gas density relay, the system is composed of the maintenance-free field test device for a gas density relay in the first aspect, or comprises the maintenance-free field test device for a gas density relay in the first aspect.

The maintenance-free field detection device for the gas density relay comprises a temperature adjusting mechanism and an intelligent control unit; the temperature adjusting mechanism is an adjustable temperature adjusting mechanism, is arranged outside or in the shell of the detected gas density relay and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay so as to enable the gas density relay to generate contact action; the intelligent control unit is connected with the temperature adjusting mechanism and is used for receiving and/or calculating the gas density value when the contact of the gas density relay acts;

the temperature adjusting mechanism is a heating element; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element and a temperature controller; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; alternatively, the first and second electrodes may be,

the temperature adjusting mechanism is a miniature thermostat;

the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors;

the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.

Preferably, the contact signal is generated when the contact is actuated, and preferably the contact signal comprises an alarm, and/or a latch.

Preferably, the on-site detection device further comprises a shell, and the intelligent control unit and the temperature adjusting mechanism are arranged in the shell.

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

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

Preferably, the circuit of the intelligent control unit comprises an intelligent control unit protection circuit, and the intelligent control unit protection circuit comprises one or more of an anti-static interference circuit (such as ESD and EMI), an anti-surge circuit, an electric fast protection circuit, an anti-radio frequency field interference circuit, an anti-pulse group interference circuit, a power supply short circuit protection circuit, a power supply connection reverse protection circuit, an electric contact misconnection protection circuit, and a charging protection circuit.

Preferably, the intelligent control unit further comprises a communication module for realizing remote transmission of the test data and/or the verification result, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

More preferably, the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier and a cable Wire.

More preferably, the wireless communication mode includes one or more of a 5G/NB-IOT communication module (e.g., 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, which are built in the sensor.

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

More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.

Preferably, a clock is further arranged on the intelligent control unit and used for regularly setting the checking time, or recording the testing time, or recording the event time.

Preferably, after the field detection device completes detection, the intelligent control unit automatically generates a verification report of the gas density relay, and if the verification report is abnormal, the intelligent control unit automatically sends an alarm, and/or uploads the alarm to a remote end, and/or sends the alarm to a designated receiver.

Preferably, the intelligent control unit comprises a microprocessor, a human-computer interface, a controller, a temperature adjusting mechanism detection piece and an execution controller.

Preferably, the temperature regulating mechanism regulates the temperature to rise and fall, and the temperature change speed is not more than 1 ℃ per second, which can be determined according to specific project technology.

Preferably, the temperature regulating mechanism regulates the temperature to rise and fall, and the temperature change speed is not more than 0.5 ℃ per second.

Preferably, the on-site detection device further comprises an on-line check contact signal sampling unit, wherein the on-line check contact signal sampling unit is provided with a sampling contact connected with the gas density relay and configured to sample a contact signal of the gas density relay; the online checking contact signal sampling unit is also connected with the intelligent control unit.

More preferably, the online check contact signal sampling unit is provided with at least one independent sampling contact, at least one contact of the gas density relay can be checked automatically at the same time, and continuous measurement is carried out without replacing the contact or reselecting the contact; wherein the content of the first and second substances,

the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.

More preferably, the online verification contact signal sampling unit is used for testing the contact action value or the switching value of the detected gas density relay, wherein the testing voltage is not lower than 24V, namely, in the verification process, the voltage is not lower than 24V is applied between corresponding terminals of the contact.

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

Further, online check-up contact signal sampling unit with the unit seal is controlled in a cavity or casing to the intelligence.

More preferably, the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit; the first connecting circuit is connected with a contact of the detected gas density relay and a contact signal control circuit, and the second connecting circuit is connected with a contact of the detected gas density relay and the intelligent control unit;

in a non-checking state, the contact is a normally open density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact of the gas density relay is connected with the intelligent control unit; alternatively, the first and second electrodes may be,

in a non-checking state, the contact is a normally closed density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, contact signal control circuit is closed, and the connection disconnection of gas density relay's contact and contact signal control circuit, second connecting circuit intercommunication will gas density relay's contact with the intelligence is controlled the unit and is connected.

Further, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact keep opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay; in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, gas density relay's contact passes through normally open contact with the intelligence is controlled the unit and is connected.

Further, the first relay and the second relay are two independent relays, or the same relay.

More preferably, the online check contact signal sampling unit is electrically and optically isolated from the contact of the detected gas density relay.

Preferably, the on-site detection device further comprises a gas density detection sensor, and the gas density detection sensor is provided with an interface communicated with the gas density relay; the gas density detection sensor is also connected with the intelligent control unit, and transmits the collected pressure value, temperature value and/or gas density value to the intelligent control unit.

More preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay is subjected to contact action or switching, so as to complete online verification of the gas density relay; alternatively, the first and second electrodes may be,

the intelligent control unit acquires a signal of contact action or switching of the gas density relay, the pressure value and the temperature value acquired by the gas density detection sensor are converted into a pressure value corresponding to 20 ℃ according to gas pressure-temperature characteristics, namely the gas density value, and online verification of the gas density relay is completed.

More preferably, the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.

More preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.

Further, the pressure sensor is mounted on a gas path of the gas density relay.

Further, the temperature sensor is installed on or outside the gas path of the gas density relay, or inside the gas density relay, or outside the gas density relay.

Further, the intelligence accuse unit compares ambient temperature value, with the temperature value that temperature sensor gathered, accomplishes the check-up to temperature sensor.

Further, the gas density detection sensor comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.

Further, the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.

Further, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; randomly arranging and combining the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors, converting the combinations into a plurality of corresponding pressure values at 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and comparing the gas density values to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are subjected to all permutation and combination, and each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristic, namely gas density values, and each gas density value is compared to complete the mutual verification of each pressure sensor and each temperature sensor; or comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with comparison density value output signals output by the gas density relay to complete mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.

More preferably, the in-situ detection device comprises at least two gas density detection sensors, each gas density detection sensor comprising a pressure sensor, a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

More preferably, the in-situ test device includes a relative pressure sensor, and/or an absolute pressure sensor.

Preferably, the on-site detection device further comprises a valve, and the valve is provided with an interface communicated with the gas density relay; the valve is also connected with the intelligent control unit; the valve is configured to adjust the gas pressure rise and fall of the gas density relay or is used for setting the initial gas pressure during verification, and then the gas density relay is enabled to generate contact action in cooperation with or/and combination with a temperature adjusting mechanism.

More preferably, the valve is an electric valve, and/or a solenoid valve.

Further, the valve is a permanent magnet type electromagnetic valve.

More preferably, the valve is a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.

More preferably, the valve is closed or opened in a hose bending or flattening mode.

More preferably, the valve is sealed within a chamber or housing.

More preferably, pressure sensors are respectively arranged on two sides of the air path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.

Preferably, the method further comprises the following steps: the gas path of the pressure regulating mechanism is communicated with the gas density relay; the pressure regulating mechanism is also connected with the intelligent control unit, the pressure of the gas density relay is regulated to rise and fall under the control of the intelligent control unit, and then the gas density relay is matched or/and combined with the temperature regulating mechanism to enable the gas density relay to generate contact action; alternatively, the first and second electrodes may be,

further comprising: the intelligent control unit is connected with the heating device; alternatively, the first and second electrodes may be,

still include air chamber and heating device, the air chamber with gas density relay is linked together, the outside or the inside of air chamber are equipped with the heating device, the intelligence control unit with the heating device is connected.

More preferably, the pressure adjustment mechanism is manually adjusted or automatically adjusted. Preferably, the intelligent control unit is configured to realize pressure control of the pressure regulating mechanism.

More preferably, the pressure changing member of the pressure adjusting mechanism is a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod extends out of the air chamber and is connected with a driving part, the other end of the piston is in sealing contact with the inner wall of the air chamber, and the driving part drives the adjusting rod to further drive the piston to move in the air chamber.

Furthermore, the intelligent control unit controls the driving part to drive the adjusting rod so as to drive the piston to move in the air chamber.

More preferably, the pressure changing member of the pressure adjusting mechanism is a piston, the piston is in sealing contact with the inner wall of the air chamber, and a driving member is arranged outside the air chamber and pushes the piston to move in the air chamber through electromagnetic force.

Further, the intelligent control unit controls the driving component to push the piston to move in the air chamber through electromagnetic force.

More preferably, the pressure changing part of the pressure adjusting mechanism is an air bag, the reciprocating mechanism is a connecting pipe for air to enter and exit the air bag, and the driving part drives the air bag to perform air suction or inflation operation.

Further, the intelligent control unit controls the driving part to drive the air bag to perform air suction or inflation operation.

More preferably, the pressure changing member of the pressure adjusting mechanism is a bellows, one end of the bellows is communicated with the vent, and the other end of the bellows extends and retracts under the driving of the driving part.

Further, the intelligent control unit controls the driving part to drive the corrugated pipe to stretch and retract.

More preferably, the pressure regulating mechanism is a release valve, and the release valve is a solenoid valve or an electric valve, or other release valves implemented by electric or gas.

Further, the intelligent control unit controls the work of the air release valve.

More preferably, the pressure regulating mechanism further comprises a flow valve controlling the gas release flow rate. Preferably, the intelligent control unit controls the work of the flow valve.

More preferably, the pressure regulating mechanism is a compressor. Preferably, the intelligent control unit controls the operation of the compressor.

More preferably, the pressure regulating mechanism is a pump including, but not limited to, a build pressure pump, a boost pressure pump, an electric air pump, or an electromagnetic air pump. Preferably, the intelligent control unit controls the work of the pump.

More preferably, the pressure regulating mechanism is sealed within a chamber or housing.

More preferably, the valve and the pressure regulating mechanism are sealed within a single chamber or housing.

More preferably, the valve is closed, the pressure regulating mechanism raises the pressure and increases the load, or the pressure regulating mechanism lowers the pressure and decreases the load, and the change speed of the load is not more than 10 per thousand of the measuring range of the detected gas density relay per second.

Preferably, the on-site detection device further comprises a multi-way joint, and the temperature adjusting mechanism and/or the intelligent control unit are/is arranged on the multi-way joint.

More preferably, the on-site detecting device further comprises a micro water sensor for monitoring the micro water value of the gas on line, the micro water sensor is arranged on the multi-way connector, and the micro water sensor is connected with the intelligent control unit.

Further, on-the-spot detection device still includes gas circulation mechanism, gas circulation mechanism sets up on the expert connects, gas circulation mechanism with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element, through heating element, realizes that gas flows, the inside little water value of on-line monitoring gas.

Further, the micro water sensor can be installed in a sealed chamber, in a capillary, at a capillary port, outside the capillary of the gas circulation mechanism.

More preferably, the on-site detecting device further comprises a decomposition substance sensor for monitoring a gas decomposition substance on line, the decomposition substance sensor is arranged on the multi-way connector, and the decomposition substance sensor is connected with the intelligent control unit.

Preferably, the field detection device further comprises a data display interface for man-machine interaction, and the current data value can be refreshed in real time; and/or to support data entry, such as entry of parameter settings.

Preferably, the field detection device further comprises a power supply for supplying power to each electric device, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable rechargeable battery, or solar energy, or a transformer for getting power, or an induction power supply.

Preferably, the on-site detection device further comprises a camera for monitoring.

Preferably, the on-site detection device can perform online air supplement.

Preferably, the in situ test device may be capable of on-line gas drying.

Preferably, the field detection device has a self-diagnosis function, and can notify an abnormality in time.

Preferably, the on-site detection device has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not carried out, and an informing signal is sent out.

Preferably, the on-site detection device is further provided with a temperature protection device for the electronic component, and the temperature protection device is used for ensuring that the electronic component can reliably work at low or high ambient temperature.

Preferably, the temperature protection device comprises a heater and/or a radiator, the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.

Preferably, the on-site detection device further comprises an analysis system for detecting, analyzing and judging the gas density value monitoring, the electrical performance of the gas density relay and the monitoring element.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has:

the utility model provides a realize on-spot detection device and system of gas density relay non-maintaining, control the unit including temperature regulation mechanism and intelligence, through the control of controlling the unit to temperature regulation mechanism through the intelligence, make the temperature of gas density relay rise or reduce, and then the temperature of the temperature compensation component of gas density relay rises or reduces, make gas density relay take place the contact action or reset, accomplish the on-spot detection (monitoring or check-up) to gas density relay, need not maintainer to field operation, realized the non-maintaining to gas density relay. The detection device is compact and reasonable in layout, connection and disassembly of all parts are easy to operate, reliability of a power grid is improved, working efficiency is improved, and cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of an on-site inspection apparatus according to a first embodiment;

FIG. 2 is a schematic structural diagram of the on-site detecting apparatus according to the second embodiment (working state, gas density relay connection);

FIG. 3 is a schematic view of a control circuit (operation state) of the on-site detecting apparatus according to the third embodiment;

FIG. 4 is a schematic structural view of the on-site detecting apparatus according to the fourth embodiment (operating state, connected to the gas density relay);

FIG. 5 is a schematic structural view of an in-situ measuring device according to a fifth embodiment;

FIG. 6 is a schematic structural view of an on-site detecting apparatus according to a sixth embodiment;

FIG. 7 is a schematic view of a control circuit of the on-site detecting apparatus according to the seventh embodiment;

FIG. 8 is a schematic view of a control circuit of the on-site detecting apparatus according to the eighth embodiment;

FIG. 9 is a schematic diagram of the control circuit of a 4-20mA type density transmitter of the in-situ test apparatus of the ninth embodiment;

fig. 10 is an architectural diagram of an in-situ detection system according to a tenth embodiment;

FIG. 11 is a schematic diagram showing an architecture of a field inspection system according to an eleventh embodiment;

fig. 12 is a schematic structural diagram of an in-situ detection system according to a twelfth embodiment.

Detailed Description

The utility model provides a realize gas density relay non-maintaining witnessed inspections device and system, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following reference drawing does and the example is lifted the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

as shown in fig. 1, the on-site detecting device includes a temperature adjusting mechanism 5 and an intelligent control unit 7. The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay, so that the gas density relay generates a contact action and generates a contact signal; the intelligent control unit 7 is connected with the temperature adjusting mechanism 5 and is configured to realize control of the temperature adjusting mechanism 5; wherein the contact signal comprises an alarm, and/or a latch.

The temperature adjustment mechanism 5 of the present embodiment is mainly composed of a heating element 501, a heat retaining member 502, a controller 504, a temperature detector 3 (the same as the temperature sensor), a temperature adjustment mechanism housing 503, and the like. The controller 504 may use PID control, or a combination of PID and fuzzy control. The range of power for the heating element 501 to electrically heat the work is controlled by the controller 504 and the temperature rise and fall range setting. The variation amplitude of the temperature is controlled by different power levels. The degree of deviation may be set to advance heating or cooling. The temperature in the temperature adjusting mechanism 5 is measured through the intelligent control unit 7 and the controller 504, and when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the action value is approached, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased. Specifically, an approximation (or gradual) method can be used to smoothly increase or decrease the temperature, for example, when the temperature reaches a set range, the heating can be stopped, and after a while, the heating with low power is performed, so that the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the temperature approaches the action value, or the requirement is set as required), that is, the temperature is required to smoothly increase or decrease.

The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature adjusting mechanism mainly comprises a heating element and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the heating element comprises but is not limited to a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the heating element consists of a plurality of heating element groups; the controller includes, but is not limited to, one of a PID controller, a PID and fuzzy controller combined controller, a variable frequency controller, and a PLC controller.

In a preferred embodiment, the on-site detecting device further comprises a housing (not shown in the figure), and the intelligent control unit 7 and the temperature adjusting mechanism 5 are arranged in the housing.

Example two:

as shown in fig. 2, the on-site detecting device of the present embodiment is additionally provided with a pressure sensor 2, a temperature sensor 3, an online check contact signal sampling unit 6, a multi-way connector 9 and an air make-up interface 10 compared with the first embodiment. The pressure sensor 2 and the air supply interface 10 are arranged on the multi-way joint 9. The temperature adjusting mechanism 5 is arranged opposite to the gas density relay 1, and the temperature sensor 3 is arranged in a shell of the density relay 1. Gas density relay 1 and tonifying qi interface 10 set up on many logical joint 9, and pressure sensor 2, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on many logical joint 9. The temperature adjustment mechanism 5 is disposed outside the density relay 1. Specifically, the density relay 1 is communicated with the electrical equipment 8 through a multi-way connector 9; the pressure sensor 2 is communicated with the gas density relay 1 on a gas path through a multi-way joint 9; the online check contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent control unit 7; the pressure sensor 2, the temperature sensor 3 and the temperature adjusting mechanism 5 are respectively connected with an intelligent control unit 7; the air supply interface 10 is communicated with the multi-way joint 9.

The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay 1, so that the gas density relay 1 generates contact action; the online check contact signal sampling unit 6 is connected with the gas density relay 1 and is configured to sample a contact signal of the gas density relay 1; wherein the contact signal comprises an alarm and/or a latch; the temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation member 502, a controller 504, a temperature detector 3 (same as a temperature sensor), a temperature adjusting mechanism shell 503 and the like. The controller 504 may use PID control, or a combination of PID and fuzzy control. The range of power for the heating element 501 to electrically heat the work is controlled by the controller 504 and the temperature rise and fall range setting. The variation amplitude of the temperature is controlled by different power levels. The degree of deviation may be set to advance heating or cooling. The temperature in the temperature adjusting mechanism 5 is measured through the intelligent control unit 7 and the controller 504, and when the action value of the contact signal of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the action value is approached, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased.

The working principle is as follows:

the temperature of the gas density relay 1 is increased by the operation or control of the temperature adjusting mechanism 5 by the intelligent control unit 7, and then the temperature of the temperature compensation element of the gas density relay is increased, and the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when the temperature is close to the action value, or the requirement is set according to the requirement), namely the temperature requirement is stably increased or decreased. Until the gas density relay 1 takes place the contact action, the contact action is transmitted to intelligence through online check contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is obtained gas density value according to pressure value, the temperature value when the contact action, or directly obtains gas density value, detects out gas density relay's contact signal action value, accomplishes the check-up work of gas density relay's contact signal action value. For example, for a gas density relay with density relay parameters of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure of the gas chamber of the electrical equipment 8 is 0.5562MPa (relative pressure), at this time, in the verification system, the pressure value is unchanged, when the temperature rises to 29.5 ℃, the alarm contact thereof operates, the intelligent control unit 7 can obtain an alarm contact operating value 0.5317MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 29.5 ℃ when the contact operates, and the intelligent control unit 7 can obtain the error of the alarm contact operating value: and 0.0117MPa (0.5317MPa-0.52 MPa is 0.0117MPa), and the checking of the alarm contact action value of the density relay is completed.

The temperature of the gas density relay 1 is reduced by operating or controlling the temperature adjusting mechanism 5 through the intelligent control unit 7, and then the temperature of a temperature compensation element of the gas density relay 1 is reduced, so that the contact point resetting of the gas density relay occurs, the contact point resetting is transmitted to the intelligent control unit 7 through the contact point signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, the contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed; for example, for the gas density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the ambient temperature is 5 ℃, the gas pressure in the electrical equipment 8 is 0.5562MPa (relative pressure), and also in the verification system at this time, the pressure value is unchanged, when the temperature is reduced to 24.8 ℃, the alarm contact is reset, the intelligent control unit 7 can obtain the return value 0.5435MPa (relative pressure) of the alarm contact of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value of 24.8 ℃ when the contact is reset, and the intelligent control unit 7 can obtain the switching difference of the alarm contact: and 0.0118MPa (0.5435-0.5317 MPa is 0.0118MPa), so that the action value of the alarm contact of the density relay is verified. The intelligent control unit 7 can determine the performance condition (such as pass or fail) of the verified gas density relay according to the requirement and the verification result (verification data).

After all the contact signal verification operations are completed, the heating element 501 of the temperature adjustment mechanism 5 is turned off by a manual or intelligent control unit 7.

Wherein, gas density relay 1 includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a density relay with indication (a density relay displayed by a pointer, a density relay displayed by a digital code, a density relay displayed by a liquid crystal) and a density relay without indication (namely a density switch); SF6 gas density relay, SF6 hybrid gas density relay, N2 gas density relay, other gas density relays, and the like.

Pressure sensor 2, comprising: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).

The temperature sensor 3 may be: a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be thermal resistance and thermocouple; can be digital type and analog type, such as DS18B20, pt 100. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.

Basic requirements or functions of the intelligent control unit 7The method comprises the following steps: accomplish control and signal acquisition to temperature regulation mechanism 5 through intelligence accuse unit 7, realize: the pressure value and the temperature value when the contact of the gas density relay 1 acts can be detected and converted into the corresponding pressure value P at 20 DEG C₂₀(density value), that is, contact operating value P of gas density relay 1 can be detected_D20And the checking work of the gas density relay 1 is completed. Alternatively, the density value P at the time of contact operation of the gas density relay 1 can be directly detected_D20And the calibration work of the gas density relay 1 is completed.

Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the calibration of the rated pressure value of the gas density relay 1 is completed. Meanwhile, the self-checking work among the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay 1, and the maintenance-free operation is realized.

Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.

Example three:

FIG. 3 is a schematic diagram of a control circuit of an in-situ test device.

The online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification, namely the safe operation of the electrical equipment is not influenced when the contact of the gas density relay 1 acts during the verification; 2) the contact signal control loop of the gas density relay 1 does not influence the performance of the on-site detection device, particularly does not influence the performance of the intelligent control unit 7, and does not damage the on-site detection device or influence the test operation.

As shown in fig. 3, the online verification contact signal sampling unit 6 of the present embodiment is mainly composed of a relay J1(61) and a relay J2 (62). When the pressure value is normal, the contact is a gas density relay of a normally open contact, wherein two pairs of normally closed contacts J11 and J12 of the relay J1(61) are connected in series in a contact signal control loop of the gas density relay 1; two pairs of normally open contacts J21 and J22 of the relay J2(62) are connected to the contacts of the gas density relay 1. It can also be: wherein a pair of normally closed contacts J11 of the relay J1(61) are connected in series in a contact signal control loop of the gas density relay 1; a pair of normally open contacts J21 of the relay J2(62) are connected to the contacts of the gas density relay 1; the relay J1(61) and the relay J2(62) may be integrated, that is, a relay having normally open and normally closed contacts. In short, the utility model can be used in a plurality of pairs, single and flexible combination. Referring to fig. 3, the intelligent control unit 7 mainly comprises a processor U1(71) and a power supply U2(72), and the processor U1(71) may be: general purpose computer, industrial computer, CPU, singlechip, ARM chip, AI chip, quantum chip, photon chip, MCU, FPGA, PLC etc., industrial control mainboard, embedded main control board etc. and other intelligent integrated circuit. The power source U2(72) may be: switching power supply, alternating current 220V, direct current power supply, LDO, programmable power supply, solar energy, storage battery, rechargeable battery, battery and the like. And the pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and the like. The temperature sensor 3 of the temperature acquisition T may be: various temperature sensing elements such as temperature sensors and temperature transmitters. The valve (F)4 may be: solenoid valves, electric valves, pneumatic valves, ball valves, needle valves, regulating valves, shut-off valves, etc. can open and close the gas circuit and even the elements controlling the flow. The valve may be semi-automatic or may be a manual valve. The pressure adjusting mechanism (a)5 may be: electric regulating piston, electric regulating cylinder, booster pump, gas cylinder pressurization, valve, electromagnetic valve and flow controller. The temperature adjustment mechanism 5 may be semi-automatic or may be manually adjusted.

The working principle of the embodiment is as follows:

the intelligent control unit 7 of the on-site detection device monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3, and obtains a corresponding 20 ℃ pressure value P according to the gas pressure-temperature characteristic₂₀(i.e., gas density value). For example, for SF6 gas, the beth-bridgeman equation can be used for the calculation; for the SF6 mixture, the calculation can be performed according to the law of dalton partial pressure, the beth-bridgman equation, the ideal gas state equation.

When it is necessary to verify the gas density relay 1, if the gas density value P is present₂₀Not less than set safety check density value P_SThe field test device issues a command.

The intelligent control unit 7 controls the connection point signal control circuit of the gas density relay 1 to be disconnected, namely, the connection point J11 and the connection point J12 of the electromagnetic relay J1 of the online checking connection point signal sampling unit 6 are disconnected, so that the safe operation of electrical equipment cannot be influenced when the gas density relay 1 is checked online, and an alarm signal or a locking control circuit cannot be mistakenly sent when the gas density relay is checked. Because the on-site detection device already performs the gas density value P before the calibration is started₂₀Not less than set safety check density value P_SThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Meanwhile, the on-site detection device closes the joints J21 and J22 of the electromagnetic relay J2 of the on-line verification joint signal sampling unit 6 under the control of the intelligent control unit 7, and at the moment, the joint P of the gas density relay 1_JIt is connected to the intelligent control unit 7 through the contacts J21 and J22 of the electromagnetic relay J2.

Then, the intelligent control unit 7 controls the temperature adjusting mechanism 5, the temperature of the temperature compensation element of the gas density relay 1 is gradually increased, so that the gas density relay 1 generates a contact action, the contact action is uploaded to the intelligent control unit 7 through the electromagnetic relay J2 of the online check contact signal sampling unit 6, and the intelligent control unit 7 converts the pressure value P and the temperature T value measured according to the contact action into the pressure value P corresponding to 20 ℃ according to the gas characteristics₂₀(gas density value)) The contact action value P of the gas density relay 1 can be detected_D20After the contact action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 controls the temperature adjusting mechanism 5 to adjust the temperature adjusting mechanism 5, so that the temperature of the temperature compensation element of the gas density relay 1 is gradually reduced, and the contact return value of the alarm and/or locking of the gas density relay 1 is tested. The field detection device can be repeatedly verified for a plurality of times (for example, 2 to 3 times), and then the average value of the field detection device is calculated, so that the verification work of the gas density relay 1 is completed.

After the verification is completed, the intelligent control unit 7 controls the connection points J21 and J22 of the electromagnetic relay J2 of the online verification connection point signal sampling unit 6 to be disconnected, and at the moment, the connection point P of the gas density relay 1 is connected_JIt is no longer connected to the intelligent control unit 7. Meanwhile, the intelligent control unit 7 controls the valve 4 to be opened, so that the gas density relay 1 is communicated with the electrical equipment on a gas path. The intelligent control unit 7 controls the connection points J11 and J12 of the electromagnetic relay J1 of the online checking connection point signal sampling unit 6 to be closed, and the density monitoring loop of the gas density relay 1 works normally, so that the gas density of the gas density relay 1 can monitor the gas density of the electrical equipment safely, and the electrical equipment can work safely and reliably. Therefore, the online checking work of the gas density relay 1 is conveniently completed, and the safe operation of the electrical equipment cannot be influenced when the gas density relay 1 is checked online.

After the checking work of the gas density relay 1 is finished, the field detection device judges and can inform the detection result, and the mode is flexible. Specifically, the method comprises the following steps: 1) the on-site detection device may be annunciated on-site, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or uploading is implemented through an online remote transmission communication mode, for example, the information can be uploaded to a remote background detection system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In short, after the on-site detection device completes the on-line verification work of the gas density relay 1, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the on-site detection device completes the on-line calibration work of the gas density relay 1, if there is an abnormality, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay 1 to a remote end (a monitoring room, a background monitoring platform, etc.), and can also display the notice on site. The simple gas density relay on-line calibration can upload abnormal calibration results through an alarm signal line and upload the results according to a certain rule, for example, when the calibration results are abnormal, a contact is connected in parallel with the alarm signal contact and is regularly closed and opened, and the conditions can be obtained through analysis; or through a separate verification signal line. Specifically, the state can be uploaded well, or the state can be uploaded in case of problems, or the verification result can be uploaded through a single verification signal line, or can be displayed on site, can be alarmed on site, or can be uploaded in a wireless mode and can be uploaded through a smart phone network. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the on-site detection device can be fully ensured in multiple modes and various combinations.

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

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

The field detection device can compare the error performance of the field detection device at different temperatures and different time periods. The performance of the gas density relay, the electrical equipment and the field detection device is judged by comparing the gas density relay, the electrical equipment and the field detection device in different periods and within the same temperature range, and the comparison of each period in history and the comparison of the history and the present are realized.

The field detection device can be repeatedly checked for multiple times (for example, 2-3 times), and the average value of the field detection device is calculated according to the checking result of each time. When necessary, the gas density relay 1 can be checked online at any time.

The on-site detection device has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay can be detected on line. Of course, the alarm and/or latch contact return values may not require testing as desired.

The on-site detection device can automatically carry out comparison and judgment when checking, and if the error difference is large, an abnormal prompt is sent out: the gas density relay, the pressure sensor, the temperature sensor and the like have problems, namely the field detection device can complete the mutual verification function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter; the mutual verification of the gas density relay, the pressure sensor and the temperature sensor can be completed. After the on-site detection device finishes the checking work, a checking report can be automatically generated, and if the checking report is abnormal, an alarm can be automatically sent out or sent to a specified receiver, for example, a mobile phone; the field detection device can display the gas density value and the verification result on the spot or display the gas density value and the verification result through a background, and the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the self-diagnosis function is provided, and abnormal and timely notices such as line breakage, short circuit alarm, sensor damage and the like can be notified; the performance of the gas density relay can be judged by comparing the error performance of the gas density relay at different temperatures and different time periods, namely comparing the error performance of the gas density relay at different periods and in the same temperature range. The system has the functions of comparing historical periods and comparing historical periods with the current period. The self-inspection can be carried out on the field detection device; and judging whether the density values of the gas density relay and the monitored electrical equipment are normal or not. The density value of the electrical equipment, the gas density relay, the pressure sensor, the temperature sensor and the like can be judged, analyzed and compared normally or abnormally, and further the gas density monitoring of the electrical equipment, the judgment, the comparison and the analysis of the states of the on-site detection device and the gas density relay are realized; the gas density monitoring and monitoring system also comprises an analysis system (expert management analysis system) which is used for detecting, analyzing and judging the gas density value monitoring, the gas density relay and the monitoring element, and knowing where the problem point is, whether the electric equipment, the gas density relay or the field detection device has the problem; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known to be open or closed at the background, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

As long as the data among the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the field detection device and the gas density relay can be indicated to be normal, so that the gas density relay does not need to be checked, the field detection device does not need to be checked, and the service life can be free from checking. Unless the data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electric device in the substation are inconsistent and abnormal, the maintenance personnel are arranged to process the data. And for the anastomotic and normal, the verification is not needed, so that the reliability and the efficiency can be greatly improved, and the cost is reduced.

Example four:

as shown in fig. 4, the field test apparatus of the present embodiment is different from the second embodiment in that:

the temperature sensor 3 is provided on the housing of the density relay 1, and the temperature adjustment mechanism 5 is also provided on the housing of the density relay 1. The pressure sensor 2, the online check joint signal sampling unit 6, the intelligent control unit 7 and the controller 504 are arranged together and are arranged on the multi-way connector 9. The gas density relay 1 is also arranged on the manifold 9. The pressure sensor 2, the online check contact signal sampling unit 6 and the controller 504 are connected with the intelligent control unit 7. The temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation member 502 and a controller 504.

Example five:

as shown in fig. 5, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, temperature regulation mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10. The temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation member 502 and a controller 504. Wherein the temperature sensor 3 is arranged on the housing of the density relay 1. And the gas density relay 1 is provided inside the temperature adjusting mechanism 5. The pressure sensor 2, the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The temperature adjusting mechanism 5 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the temperature adjusting mechanism 5 is connected with an intelligent control unit 7. During detection, the gas density relay 1 is arranged on a multi-way connector 9 of the on-site detection device, and a gas path of the gas density relay is communicated with the pressure sensor 2.

Example six:

as shown in fig. 6, the field test apparatus of the present embodiment includes: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature adjusting mechanism 5, an online checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10, a pressure adjusting mechanism 11 and a self-sealing valve 13. One end of the self-sealing valve 13 is used for being connected to electrical equipment in a sealing mode, and the other end of the self-sealing valve 13 is communicated with one end of the valve 4; the other end of the valve 4 is connected with a multi-way joint 9. The pressure sensor 2 and the temperature sensor 3 are arranged together and connected with the multi-way joint 9, and can form a gas density transmitter to directly obtain the density value, the pressure value and the temperature value of gas; the temperature adjusting mechanism 5 can be connected with the multi-way joint 9; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the temperature adjusting mechanism 5 and the pressure adjusting mechanism 11 are connected with the intelligent control unit 7.

The pressure adjusting mechanism 11 of the present embodiment is communicated with the multi-way joint 9, and the pressure adjusting mechanism 11 mainly comprises a bellows 1104 and a driving part 1102. One end of the bellows 1104 is in communication with the multi-way joint 9, and the other end thereof is driven by the driving member 1102 to expand and contract.

During detection, the gas density relay is arranged on the multi-way connector 9 of the on-site detection device, so that the interior of the corrugated pipe 1104 is hermetically connected with the gas density relay to form a reliable sealed cavity. The valve 4 is closed, then the pressure adjusting mechanism 11, under the control of the intelligent control unit 7, causes the driving part 1102 to push the bellows 1104 to change the volume, and the sealed cavity changes the volume accordingly, thereby completing the pressure rise and fall. Then, the temperature of the gas density relay 1 is increased by controlling the temperature adjusting mechanism 5 by the intelligent control unit 7, the temperature of the temperature compensation element of the gas density relay 1 is increased, and the pressure adjusting mechanism 11 is driven by the intelligent control unit 7, so that the gas pressure is slowly reduced, the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, the intelligent control unit 7 obtains the gas density value according to the pressure value and the temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay 1 is detected, and the checking work of the contact signal action value of the gas density relay is completed.

Further comprising: namely, the intelligent control unit 7 or the gas density relay 1, according to the set verification time or/and verification instruction, and the gas density value condition or/and temperature value condition, under the condition that the gas density relay is allowed or/and can be verified: closing the valve through an intelligent control unit; control unit drive pressure adjustment mechanism through the intelligence, make gas pressure slowly descend, and control the unit to temperature adjustment mechanism through the intelligence, make gas density relay's temperature rise, and then gas density relay's temperature compensation component's temperature rise, make gas density relay take place the contact action, the contact action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, the intelligence is controlled the pressure value when unit according to the contact action, the temperature value obtains gas density value, or directly obtains gas density value, detect out gas density relay's contact signal action value, accomplish the check-up work of gas density relay's contact signal action value.

The valve 4 can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear and bevel gear drive; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valve 4 can be driven by automatic valves, power-driven valves and manual valves. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valves are connected, either directly or indirectly, integrally or separately, to the electrical equipment through self-sealing valves, manual valves, or non-removable valves. The valve may be normally open or normally closed, unidirectional or bidirectional, as desired. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc. In addition, for the SF6 gas, a specific conversion method of the pressure-temperature characteristic of the SF6 gas can be calculated according to the Betty-Bridgman equation; for the SF6 mixed gas, a specific conversion method of the pressure-temperature characteristic of the SF6 mixed gas can be calculated according to a Dalton partial pressure law, a Betty-Bridgman equation and an ideal gas state equation. The temperature regulating mechanism is arranged in the shell of the gas density relay or outside the shell and is arranged on the shell. The communication equipment is arranged inside or outside the shell of the gas density relay or inside or outside the shell of the circuit control part, and the mode can be flexibly set according to the requirement. The temperature sensor may be digital or analog. The signal generator comprises but is not limited to a microswitch, a magnetic auxiliary electric contact, a reed switch and a miniature switch, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes, but is not limited to, a bourdon tube, a bellows + spring, a pressure sensor; the temperature compensation element includes, but is not limited to, a temperature compensation sheet, a gas enclosed in the housing, and a temperature compensation sheet + a gas enclosed in the housing.

Example seven:

as shown in fig. 7, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, temperature regulation mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The pressure sensor 2, the temperature sensor 3, the valve 4, the temperature adjusting mechanism 5 and the online check contact signal sampling unit 6 are all connected with the processor 71(U1) of the intelligent control unit 7.

The intelligent control unit 7 further comprises a power supply 72(U2), a communication module 73(U3), an intelligent control unit protection circuit 74(U4), a display and output and operation 75(U5), and a data storage 76 (U6). The processor 71(U1) contains a crystal oscillator and filter circuitry. The intelligent control unit protection circuit 74(U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module. In the communication module 73(U3), the communication chip is connected to the communication interface through the surge protection circuit.

The communication mode of the communication module 73(U3) may be wired: such as RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar and the like. The display and output 75(U5) may be: nixie tubes, LEDs, LCDs, HMI, displays, matrix screens, printers, faxes, projectors, mobile phones and the like can be flexibly combined by one or a plurality of types. The data store 76(U6) may be: FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched paper tapes, optical disks, U disks, discs, films, etc., can be flexibly combined by one or more types.

Example eight:

as shown in fig. 8, the difference between this embodiment and the seventh embodiment is: the intelligent control unit 7 includes a processor 71(U1), a power supply 72(U2), a communication module 73(U3), and an intelligent control unit protection circuit 74 (U4). The pressure sensor 2 passes through the overvoltage protection circuit, the operational amplifier circuit, the modulator circuit, and the filter circuit to the processor 71 (U1).

Example nine:

FIG. 9 is a schematic diagram of a 4-20mA type density transmitter circuit for an in situ test setup. As shown in fig. 9, the 4-20Ma type density transmitter mainly comprises a microprocessor (including a main controller, a crystal oscillator and a filter circuit), a power supply, a modulation circuit, a current loop, a protection circuit, a pressure sensor, an operational amplifier, a temperature sensor, a proportional modulation module, a voltage reduction module, and the like. The microprocessor contains a crystal oscillator and a filter circuit. The protection circuit comprises a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit and the like. The analog pressure sensor passes through the overvoltage protection circuit and the operational amplification circuit, reaches the modulation circuit, and then passes through the filter circuit to reach the microprocessor, so that the microprocessor can acquire a pressure value and a temperature value, and a density value signal is obtained after calculation and conversion of the microprocessor. The density value signal passes through a proportion modulation module, a modulation circuit and a current loop to obtain the density value of 4-20 Ma.

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

Example ten:

fig. 10 is a schematic diagram of an architecture of an in-situ detection system. As shown in fig. 10, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of field detection devices are connected with a remote background detection system sequentially through a concentrator and a protocol converter. Wherein, each field detection device is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber.

In this embodiment, the remote background detection system PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via HUB 0. Each HUB is connected with a group of field detection devices Z, such as a HUB1 connected with field detection devices Z11, Z12 and … … Z1n, a HUB2 connected with field detection devices Z21, Z22, … … Z2n and … …, and a HUB HUBm connected with field detection devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

The remote background detection system comprises: 1) a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2) A background software key business module: such as rights management, device management, data storage queries, etc., as well as user management, alarm management, real-time data, historical data, real-time profiles, historical profiles, configuration management, data collection, data parsing, record condition, exception handling, etc. 3) Interface configuration: such as Form interface, Web interface, configuration interface, etc.

Example eleven:

fig. 11 is a schematic structural diagram of another field inspection system, in which a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the embodiment. The remote background detection system PC is connected with two comprehensive application servers 1 and Server2 through a network switch Gateway, the two comprehensive application servers 1 and the Server2 are communicated with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2 and … … ProCn) through a station control layer A network and a B network, and the protocol converters/online monitoring intelligent units ProC are communicated with a plurality of HUB (HUB1, HUB2 and HU … … HUBm) through an R5485 network. Each HUB is connected with a group of field detection devices Z, such as a HUB1 connected with field detection devices Z11, Z12 and … … Z1n, a HUB2 connected with field detection devices Z21, Z22, … … Z2n and … …, and a HUB HUBm connected with field detection devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

Example twelve:

FIG. 12 is a schematic diagram of an alternative field test system. The embodiment is a schematic diagram of a wireless transmission mode, and a dashed box in the diagram indicates that the wireless module Wn and the field detection device Zn can be integrated or separated, and the specific scheme can be flexible.

The multiple integrated application servers 1, servers 2 and … … servers n are in Wireless communication with the field detection devices through the cloud terminal Cluod, the Wireless Gateway (Wireless Gateway) and the Wireless modules of the field detection devices. Wherein n is a natural number.

Besides on-line checking of the on-site detection device, the system can monitor physical quantities such as temperature, pressure, density and micro-water of SF6 gas in electrical equipment such as a circuit breaker and a GIS in real time and the variation trend thereof, is provided with a communication interface, uploads data to a remote background detection system, realizes the on-line monitoring function of physical quantities such as SF6 gas density and micro-water of the electrical equipment such as the circuit breaker and the GIS, can flexibly set alarm limits, inquire historical data on site, accurately analyze and judge the gas leakage trend and the gas leakage rate of the equipment, and discover the abnormal condition of the equipment in advance, thereby guaranteeing the safe operation of the whole set of system of the electrical equipment and the transformer substation, and really realizing the on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station. The configuration principle is as follows: the system is constructed by adopting a bus type layered distributed structure, and the requirements of a three-layer system structure of the intelligent substation are met: the system comprises a process layer (a sensor layer, namely a field detection device), a spacer layer (a data transmission and collection processing layer), a station control layer (a monitoring host, a database server and the like), and the whole system adopts an IEC61850 standard electric power communication protocol. The remote background detection system is responsible for collecting, comprehensively analyzing, diagnosing faults, storing and forwarding standardized data of monitoring data and has the functions of real-time data display, change trend analysis, historical data query, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electrical equipment without on-site, can check and detect a gas density relay on line, can provide a solid basis for the state maintenance of SF6 electrical equipment through expert analysis software, big data analysis and trend analysis, meets the requirements of power grid automation and equipment state maintenance, and plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.

Under different temperatures, the calibration requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the accuracy requirements, namely the error determination requirements, corresponding to each temperature value are different, and the calibration requirements can be specified according to standards or otherwise. The comparison and judgment of the same period (or the same season) of different years can be carried out. For example, the checking result of 5 months in 2021 can be directly compared with the checking result of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, and judgment is carried out. The verification can be carried out when the verification is needed, and a movable design can be carried out, namely the operation of the A transformer substation can be carried out for a period of time, after the task is completed, the B transformer substation can be moved to operate for a period of time, and after the task is completed, the C transformer substation can be moved to operate.

The on-site detection device has the advantages that the verification precision can reach 20 degrees and is 0.25 grade, the verification precision can reach 0.625 grade at high temperature or low temperature, the verification precision meets the requirements, and the requirements or related specifications are met economically and quantitatively.

The above detailed description of the embodiments of the application is intended to be exemplary only, and the application is not limited to the embodiments described above. Any equivalent modifications and substitutions to the above applications are within the scope of the present application for those skilled in the art. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present application are intended to be covered by the present application.

Claims

1. Realize the on-the-spot detection device of gas density relay non-maintaining, its characterized in that: comprises a temperature adjusting mechanism and an intelligent control unit; the temperature adjusting mechanism is an adjustable temperature adjusting mechanism, is arranged outside or in the shell of the detected gas density relay and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay so as to enable the gas density relay to generate contact action; the intelligent control unit is connected with the temperature adjusting mechanism and is used for receiving and/or calculating the gas density value when the contact of the gas density relay acts;

the temperature adjusting mechanism is a miniature thermostat;

the heating element comprises a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor;

the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises one of a PID controller, a controller formed by combining PID and fuzzy control, a variable frequency controller and a PLC controller.

2. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: when the contact acts, a contact signal is generated, and the contact signal comprises an alarm and/or a locking.

3. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device further comprises a shell, and the intelligent control unit and the temperature adjusting mechanism are arranged in the shell.

4. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the circuit of unit is controlled including the intelligence unit protection circuit is controlled to the intelligence, the intelligence is controlled the unit protection circuit and is included antistatic interference circuit, anti surge circuit, the quick protection circuit of electricity, anti radio frequency field interference circuit, anti pulse crowd interference circuit, power short-circuit protection circuit, power connect reverse protection circuit, electric contact misconnection protection circuit, charge in the protection circuit one or several kinds.

5. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

6. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.

7. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 6, wherein: the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged and/or preventing electromagnetic interference caused by the misconnection of a user.

8. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit is further provided with a clock, and the clock is used for regularly setting the checking time, or recording the testing time, or recording the event time.

9. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: after the field detection device finishes detection, the intelligent control unit automatically generates a check report of the gas density relay, and if the check report is abnormal, the intelligent control unit automatically gives an alarm and/or uploads the alarm to a remote end and/or sends the alarm to a designated receiver.

10. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit comprises a microprocessor, a human-computer interface, a controller, a temperature adjusting mechanism detection piece and an execution controller.

11. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the temperature regulating mechanism regulates the temperature to rise and fall, and the temperature change speed is not more than 0.5 ℃ per second.

12. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises an on-line checking contact signal sampling unit, wherein the on-line checking contact signal sampling unit is provided with a sampling contact connected with the gas density relay and is configured to sample a contact signal of the gas density relay; the online checking contact signal sampling unit is also connected with the intelligent control unit.

13. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 12, wherein: the online checking contact signal sampling unit is provided with at least one independent sampling contact, can automatically check at least one contact of the gas density relay at the same time, and continuously measures without replacing the contact or reselecting the contact; wherein the content of the first and second substances,

the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.

14. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 12, wherein: the online checking contact signal sampling unit is used for testing that the test voltage of the contact action value or the switching value of the detected gas density relay is not lower than 24V, namely, the voltage of not lower than 24V is applied between corresponding terminals of the contact during checking.

15. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 12, wherein: the online check joint signal sampling unit and the intelligent control unit are arranged together.

16. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 15, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

17. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 12, wherein: the online check joint signal sampling unit comprises a first connecting circuit and a second connecting circuit; the first connecting circuit is connected with a contact of the detected gas density relay and a contact signal control circuit, and the second connecting circuit is connected with a contact of the detected gas density relay and the intelligent control unit;

18. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 17, wherein: the first connecting circuit comprises a first relay, the second connecting circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact are kept in opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay;

in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, gas density relay's contact passes through normally open contact with the intelligence is controlled the unit and is connected.

19. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 18, wherein: the first relay and the second relay are two independent relays or the same relay.

20. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 12, wherein: the online check contact signal sampling unit is isolated from the contact of the detected gas density relay in a circuit by photoelectricity.

21. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device also comprises a gas density detection sensor, and the gas density detection sensor is provided with an interface communicated with the gas density relay; the gas density detection sensor is also connected with the intelligent control unit, and transmits the collected pressure value, temperature value and/or gas density value to the intelligent control unit.

22. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 21, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay is subjected to contact action or switching, and completes online verification of the gas density relay; alternatively, the first and second electrodes may be,

23. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 21, wherein: the gas density detection sensor is of an integrated structure.

24. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 23, wherein: the gas density detection sensor is a gas density transmitter with an integrated structure.

25. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 21, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.

26. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 25, wherein: the pressure sensor is arranged on a gas path of the gas density relay;

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

27. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 25, wherein: the intelligent control unit compares the environmental temperature value with the temperature value collected by the temperature sensor to complete the check on the temperature sensor.

28. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 25, wherein: the gas density detection sensor comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.

29. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 25, wherein: the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.

30. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 21, wherein: the on-site detection device comprises at least two gas density detection sensors, wherein each gas density detection sensor comprises a pressure sensor and a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

31. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 21, wherein: the in-situ test device includes a relative pressure sensor, and/or an absolute pressure sensor.

32. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises a valve, wherein the valve is provided with an interface communicated with the gas density relay; the valve is also connected with the intelligent control unit; the valve is configured to adjust the gas pressure rise and fall of the gas density relay or is used for setting the initial gas pressure during verification, and then the gas density relay is enabled to generate contact action in cooperation with or/and combination with a temperature adjusting mechanism.

33. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 1 or 32, wherein: the gas circuit of the pressure adjusting mechanism is communicated with the gas density relay; the pressure regulating mechanism is also connected with the intelligent control unit, the pressure of the gas density relay is regulated to rise and fall under the control of the intelligent control unit, and then the gas density relay is matched or/and combined with the temperature regulating mechanism to enable the gas density relay to generate contact action; alternatively, the first and second electrodes may be,

34. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device also comprises a data display interface for man-machine interaction, and the current data value can be refreshed in real time; and/or to support data entry, such as entry of parameter settings.

35. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device further comprises a power supply for supplying power to each electric device, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable battery, or solar energy, or a power supply obtained by taking power by a mutual inductor, or an induction power supply.

36. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises a camera for monitoring.

37. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device can be used for online air supplement.

38. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the in-situ detection device can perform on-line gas drying.

39. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device has a self-diagnosis function and can inform abnormality in time.

40. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not carried out, and an informing signal is sent out.

41. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device is also provided with a temperature protection device for the electronic components, and is used for ensuring that the electronic components can reliably work at low or high ambient temperature.

42. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 41, wherein: the temperature protection device comprises a heater and/or a radiator, wherein the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.

43. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises an analysis system for detecting, analyzing and judging the gas density value monitoring, the electrical performance of the gas density relay and the monitoring elements.

44. Realize the on-the-spot detecting system of gas density relay non-maintaining, its characterized in that: the system consists of the field detection device for realizing maintenance-free of the gas density relay, which is disclosed by any one of claims 1 to 43; alternatively, the system comprises the field test device for realizing maintenance-free of the gas density relay, which is disclosed by any one of claims 1 to 43.