A gas density relay with online self-calibration function and calibration method thereof

Abstract

The present application provides a gas density relay with an online self-checking function and a check method thereof, which are used in high-voltage and medium-voltage electrical equipment, and include a gas density relay body, a gas density detection sensor, a gas path isolation pressure regulating mechanism, an online check contact signal sampling unit and an intelligent control unit. The intelligent control unit controls the movement of the partition member of the gas path isolation pressure regulating mechanism to cut off the gas path connection between the first interface and the second interface. At the same time, the volume of the sealed cavity changes, and the gas pressure of the gas density relay body slowly decreases, thereby causing contact action. The contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the alarm and / or locking contact signal action value and / or return value based on the density value when the contact is in action. The check can be completed without the need for maintenance personnel to go to the site, which greatly improves the reliability and efficiency of the power grid and reduces costs. In particular, there is no need for an electric control valve, which makes the sealing performance better and the volume smaller.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a gas density relay with an online self-checking function and a checking method thereof, which is applied to high-voltage and medium-voltage electrical equipment. Background Art

[0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in power departments and industrial and mining enterprises, promoting the rapid development of the power industry. In recent years, with the rapid development of the economy, the capacity of my country's power system has expanded dramatically, and the amount of SF6 electrical equipment has increased. The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment decreases and the micro-water content exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment: 1) The density of SF6 gas decreases to a certain extent, which will lead to the loss of insulation and arc extinguishing performance. 2) With the participation of some metal objects, SF6 gas can react with water at a high temperature of more than 200°C to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a lot of heat, causing the pressure of the gas chamber to increase. 3) When the temperature drops, excessive moisture may form condensation water, which will significantly reduce the insulation strength of the surface of the insulating parts, and even flashover, causing serious harm. Therefore, the power grid operation regulations stipulate that the density and water content of SF6 gas must be regularly tested before the equipment is put into operation and during operation.

[0003] As unmanned substations develop towards networking and digitalization, and the requirements for remote control and telemetry continue to increase, online monitoring of the gas density and micro-water content of SF6 electrical equipment has important practical significance. With the continuous and vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a vital role in the safety of smart grids. Most high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as leakage), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, online monitoring of the gas density value in SF6 high-voltage electrical equipment has become very common, and the application of gas density monitoring systems (gas density relays) will flourish. The current gas density monitoring system (gas density relay) is basically: 1) Using remote SF6 gas density relays to collect and upload density, pressure and temperature, and realize online monitoring of gas density. 2) Using gas density transmitters to collect and upload density, pressure and temperature, and realize online monitoring of gas density. SF6 gas density relays are core and key components. However, due to the harsh operating environment of high-voltage substations, especially the strong electromagnetic interference, the remote transmission SF6 gas density relay in the currently used gas density monitoring system (gas density relay) is composed of a mechanical density relay and an electronic remote transmission part; in addition, the power grid system using gas density transmitters still retains the traditional mechanical density relay. The mechanical density relay has one, two or three sets of mechanical contacts, which can transmit information to the target device terminal through the contact connection circuit in time when the pressure reaches the alarm, lockout or overpressure state to ensure the safe operation of the equipment. At the same time, the monitoring system is also equipped with a safe and reliable circuit transmission function, which establishes an effective platform for realizing real-time data remote data reading and information monitoring, and can transmit information such as pressure, temperature, density, etc. to the target device (usually a computer terminal) in time to realize online monitoring.

[0004] Regular inspection of gas density relays on electrical equipment is a necessary measure to prevent accidents and ensure the safe and reliable operation of electrical equipment. Both the "Electricity Preventive Test Regulations" and the "Twenty-five Key Requirements for Preventing Major Accidents in Electricity Production" require regular inspection of gas density relays. From the actual operation situation, regular inspection of gas density relays is one of the necessary means to ensure the safe and reliable operation of power equipment. Therefore, the inspection of gas density relays has been highly valued and popularized in the power system, and has been implemented by power supply companies, power plants, and large factories and mines. In order to complete the on-site inspection and testing of gas density relays, power supply companies, power plants, and large factories and mines need to be equipped with testers, equipment vehicles, and high-value SF6 gas. Including the operating losses caused by power outages during inspection, it is roughly calculated that the annual inspection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the on-site inspection of the inspectors is not standardized, there are safety hazards. Therefore, it is very necessary to innovate the existing gas density self-calibration gas density relay, especially the gas density online self-calibration gas density relay or system, so that the gas density relay or the monitoring system composed of the gas density online monitoring also has the calibration function of the gas density relay, thereby completing the regular calibration of the (mechanical) gas density relay without the need for maintenance personnel to go to the site, greatly improving work efficiency and reducing costs. In order to eliminate the need for electric control valves, make them have better sealing performance, smaller size, improve reliability, and facilitate promotion and application, new innovations are needed. Summary of the invention

[0005] The object of the present invention is to provide a gas density relay with an online self-checking function to solve the problems raised in the above technical background.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present application provides a gas density relay with an online self-checking function, comprising: a gas density relay body, a gas density detection sensor, a gas path isolation pressure adjustment mechanism, an online check contact signal sampling unit and an intelligent control unit;

[0008] The gas density detection sensor is connected to the gas density relay body;

[0009] The gas path of the gas density relay body is connected to the first interface of the gas path isolation pressure regulating mechanism;

[0010] The gas path isolation pressure regulating mechanism is also provided with a second interface connected to the electrical device, and the gas path isolation pressure regulating mechanism is configured to isolate the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action;

[0011] The online verification contact signal sampling unit is directly or indirectly connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body;

[0012] An intelligent control unit is connected to the gas density detection sensor, the gas path isolation pressure regulating mechanism and the online verification contact signal sampling unit, respectively, and is configured to complete the control of the gas path isolation pressure regulating mechanism, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body;

[0013] Wherein, the contact signal includes alarm and / or lock.

[0014] The second aspect of the present application provides a gas density monitoring device with an online self-checking function, comprising: a gas density relay body, a gas density detection sensor, a gas path isolation pressure regulating mechanism, an online check contact signal sampling unit and an intelligent control unit;

[0015] The gas density detection sensor is connected to the gas density relay body;

[0016] The gas path of the gas density relay body is connected to the first interface of the gas path isolation pressure regulating mechanism;

[0017] The gas path isolation pressure regulating mechanism is also provided with a second interface connected to the electrical device, and the gas path isolation pressure regulating mechanism is configured to isolate the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action;

[0018] The online verification contact signal sampling unit is directly or indirectly connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body;

[0019] An intelligent control unit is connected to the gas density detection sensor, the gas path isolation pressure regulating mechanism and the online verification contact signal sampling unit, respectively, and is configured to complete the control of the gas path isolation pressure regulating mechanism, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body;

[0020] Wherein, the contact signal includes alarm and / or lock.

[0021] Preferably, the gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

[0022] The gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas path isolation pressure regulating mechanism; the gas path isolation pressure regulating mechanism is arranged on the gas density relay body; or,

[0023] The gas density detection sensor, the gas path isolation pressure adjustment mechanism, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

[0024] The gas density detection sensor is arranged on the gas density relay body; or,

[0025] The gas density detection sensor is arranged on the gas path isolation pressure regulating mechanism; or,

[0026] The gas density relay body is arranged on the gas path isolation pressure regulating mechanism; or,

[0027] The online verification contact signal sampling unit and the intelligent control unit are arranged on the gas path isolation pressure regulating mechanism.

[0028] Preferably, the gas density relay body and the gas density detection sensor are an integrated structure; or, the gas density relay body and the gas density detection sensor are a remote gas density relay with an integrated structure.

[0029] Preferably, the gas density detection sensor is an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.

[0030] More preferably, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

[0031] Preferably, the online verification contact signal sampling unit and the intelligent control unit are arranged together; preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a housing.

[0032] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter composed of a pressure sensor and a temperature sensor is used; or, a density detection sensor using quartz tuning fork technology is used.

[0033] More preferably, the pressure sensor is installed on the gas path of the gas density relay body or on the gas path isolation pressure regulating mechanism; the temperature sensor is installed on the gas path of the gas density relay body or outside the gas path, or inside the gas density relay body, or outside the gas density relay body.

[0034] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay or gas density monitoring device.

[0035] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and completes the online verification of the gas density relay or the gas density monitoring device; or,

[0036] The intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and converts it into a pressure value corresponding to 20°C, that is, the gas density value, according to the gas pressure-temperature characteristics, to complete the online calibration of the gas density relay or gas density monitoring device.

[0037] Preferably, the gas density relay body has a density comparison value output signal, and the density comparison value output signal is connected to the intelligent control unit; or,

[0038] The gas density relay body is provided with a comparative pressure value output signal, and the comparative pressure value output signal is connected to the intelligent control unit.

[0039] Preferably, the gas path isolation pressure regulating mechanism includes a sealed cavity and a partition member in the sealed cavity, and the first interface and the second interface are both arranged on the wall of the sealed cavity and connected to the internal space of the sealed cavity; the partition member is configured to isolate the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body so that the gas density relay body generates a contact signal action.

[0040] More preferably, the gas path isolation pressure regulating mechanism further comprises a connecting member and a driving component, and the isolation member is connected to the driving component via the connecting member; or,

[0041] The partition and the connecting piece are designed to be integrated and directly connected to the driving component; or,

[0042] The partition member is associated with the driving member through magnetic coupling;

[0043] Among them, preferably, the driving components include but are not limited to one of magnetism, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure pump, boost pump, boost valve, electric air pump, electromagnetic air pump, pneumatic element, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, and chemical reaction thrust mechanism.

[0044] Furthermore, a fifth interface is provided at one end of the sealing cavity, one end of the connecting member is connected to the partition member, and the other end passes through the fifth interface and is connected to the driving component.

[0045] Furthermore, the first interface is closer to the fifth interface than the second interface, or the first interface is farther away from the fifth interface than the second interface.

[0046] Furthermore, the air path isolation pressure regulating mechanism also includes a sealing connector, which is arranged at the fifth interface of the sealing cavity, and the other end of the connecting member passes through the sealing connector to be connected to the driving component; preferably, the sealing connector includes but is not limited to one of a bellows, an airbag, and a sealing ring.

[0047] One end of the sealing coupling is sealingly connected to the fifth interface, and the other end is sealingly connected to the driving end of the driving component, or the other end seals and wraps the driving component in the sealing coupling.

[0048] Furthermore, the sealed cavity is a retractable cavity, the driving component is located in the sealed cavity and is provided with driving ends in two directions; the connecting member includes a first connecting member and a second connecting member, which are respectively connected to the driving ends in two directions; wherein the other end of the first connecting member is connected to the inner wall of the sealed cavity; the other end of the second connecting member is connected to the partition member, the partition member is provided with a through hole to connect the interior of the sealed cavity with the second interface, and a sealing member is provided on the side of the partition member facing the second interface, and the sealing member is arranged around the through hole.

[0049] Furthermore, the sealing member is two sealing rings, and the through hole is located between the two sealing rings.

[0050] Furthermore, the two driving ends face in opposite directions.

[0051] Furthermore, the first interface is connected to the gas density relay body through a connecting tube (preferably a capillary tube).

[0052] Furthermore, the first connecting member is connected to an end of the sealed cavity provided with a first interface in a direction facing away from the second connecting member.

[0053] Furthermore, the sealed cavity is provided with a fixed point whose position cannot be changed, and the driving component is installed or connected to the fixed point.

[0054] Furthermore, during verification, the partition piece of the gas path isolation pressure regulating mechanism moves under the drive of the driving component, and the partition piece isolates the gas path connection between the first interface and the second interface. The gas pressure in the sealed cavity changes with the position of the partition piece, which is used to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action.

[0055] More preferably, the edge of the partition piece is in sealing contact with the inner wall of the sealing cavity; preferably, the partition piece includes, but is not limited to, one of a piston and a sealing isolation piece.

[0056] Preferably, the gas path isolation pressure regulating mechanism is sealed in a cavity or a housing.

[0057] Preferably, the online verification contact signal sampling unit includes an isolation sampling element, which is controlled by the gas density relay body, or the gas path isolation pressure regulating mechanism, or the intelligent control unit; in the non-verification state, the online verification contact signal sampling unit is relatively isolated from the contacts of the gas density relay body in the circuit through the isolation sampling element; in the verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay body through the isolation sampling element, and connects the contacts of the gas density relay body with the intelligent control unit; preferably, the isolation sampling element includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optocoupler, and a thyristor.

[0058] Preferably, the gas density relay or gas density monitoring device further comprises: a multi-way connector, on which the gas density relay body and the gas path isolation pressure regulating mechanism are arranged; or, the gas path isolation pressure regulating mechanism is fixed on the multi-way connector; or,

[0059] The gas density relay body, the gas density detection sensor, and the gas path isolation pressure regulating mechanism are arranged on the multi-way connector.

[0060] More preferably, the gas density relay or gas density monitoring device further includes: a gas supply interface, which is arranged on the gas path isolation pressure regulating mechanism; or, the gas supply interface is arranged on the electrical equipment; or, the gas supply interface is arranged on the multi-way connector.

[0061] Preferably, the gas density relay or gas density monitoring device also includes: a valve, and the gas path isolation pressure regulating mechanism is also provided with a third interface; one end of the valve is connected to the third interface of the gas path isolation pressure regulating mechanism, and the other end of the valve is directly or indirectly connected to the electrical equipment; the first interface is located between the second interface and the third interface.

[0062] More preferably, the valve is an electric valve or a solenoid valve.

[0063] Furthermore, the valve is a permanent magnet solenoid valve.

[0064] More preferably, the valve is a piezoelectric valve, or a temperature-controlled valve, or a new type of valve made of intelligent memory material and opened or closed by electric heating.

[0065] More preferably, the valve is closed or opened by bending or pinching a hose.

[0066] More preferably, the valve is sealed within a cavity or housing.

[0067] More preferably, the gas density relay or the gas density monitoring device further comprises: a self-sealing valve, wherein the self-sealing valve is installed between the multi-way connector and the valve; or the valve is installed between the multi-way connector and the self-sealing valve.

[0068] Preferably, the gas density relay or gas density monitoring device further comprises: a trace water sensor connected to the gas density relay body and the intelligent control unit respectively, and / or a decomposition product sensor connected to the gas density relay body and the intelligent control unit respectively.

[0069] More preferably, the gas density relay or the gas density monitoring device further comprises: a gas circulation mechanism, which is respectively connected to the gas density relay body and the intelligent control unit, and comprises a capillary, a sealed chamber and a heating element.

[0070] Furthermore, the micro-water sensor can be installed in the sealed chamber of the gas circulation mechanism, in the capillary, at the capillary mouth, or outside the capillary.

[0071] Preferably, the gas density relay or gas density monitoring device also includes: a temperature regulating mechanism, which is a temperature-adjustable regulating mechanism, configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body, and then cooperate with or / and combine with the gas path isolation pressure regulating mechanism to cause the gas density relay body to generate a contact signal action; the intelligent control unit is connected to the temperature regulating mechanism to complete the control of the temperature regulating mechanism.

[0072] More preferably, the temperature regulating mechanism is a heating element; or,

[0073] The temperature regulating mechanism includes a heating element, a heat preservation member, a temperature controller, a temperature detector, and a temperature regulating mechanism housing; or,

[0074] The temperature adjustment mechanism includes a heating element and a temperature controller; or,

[0075] The temperature adjustment mechanism includes a heating element, a heating power regulator and a temperature controller; or,

[0076] The temperature adjustment mechanism includes a heating element, a cooling element, a power regulator and a temperature controller; or,

[0077] The temperature adjustment mechanism includes a heating element, a heating power regulator and a constant temperature controller; or,

[0078] The temperature adjustment mechanism includes a heating element, a controller, and a temperature detector; or,

[0079] The temperature adjustment mechanism is a heating element, and the heating element is arranged near the temperature compensation element; or,

[0080] The temperature regulating mechanism is a micro thermostatic box;

[0081] The number of the heating element is at least one, and the heating element includes, but is not limited to, a silicone rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device, and a semiconductor;

[0082] The temperature controller is connected to the heating element and is used to control the heating temperature of the heating element. The temperature controller includes, but is not limited to, a PID controller, a controller combining PID and fuzzy control, a frequency conversion controller, and a PLC controller.

[0083] Preferably, at least two gas density relay bodies, at least two gas path isolation pressure regulating mechanisms, at least two online verification contact signal sampling units and an intelligent control unit, and a gas density detection sensor are used to complete the online verification of the gas density relay or the gas density monitoring device; or,

[0084] At least two gas density relay bodies, at least two gas path isolation pressure regulating mechanisms, at least two online verification contact signal sampling units, at least two intelligent control units and a gas density detection sensor to complete the online verification of the gas density relay or the gas density monitoring device; or,

[0085] At least two gas density relay bodies, at least two gas path isolation pressure regulating mechanisms, at least two online verification contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are used to complete the online verification of the gas density relay or the gas density monitoring device.

[0086] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor.

[0087] Specifically, the pressure sensor can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor; it can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure sensor with a Baden tube and an induction coil), a resistance pressure sensor (such as a pressure sensor with a Baden tube and a sliding wire resistor); it can be an analog pressure sensor or a digital pressure sensor; the temperature sensor can be a thermocouple, a thermistor, or a semiconductor type; it can be a contact type or a non-contact type; it can be a thermal resistor or a thermocouple.

[0088] More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor and / or an absolute pressure sensor.

[0089] Further, when the pressure sensor is an absolute pressure sensor, it is expressed in absolute pressure values, and its calibration result is the corresponding absolute pressure value at 20°C. When it is expressed in relative pressure values, its calibration result is converted into the corresponding relative pressure value at 20°C. When the pressure sensor is a relative pressure sensor, it is expressed in relative pressure values, and its calibration result is the corresponding relative pressure value at 20°C. When it is expressed in absolute pressure values, its calibration result is converted into the corresponding absolute pressure value at 20°C. The conversion relationship between the absolute pressure value and the relative pressure value is:

[0090] P 绝对压力 =P 相对压力 +P 标准大气压 .

[0091] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete the online monitoring of the gas density by the gas density relay, that is, to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay.

[0092] More preferably, the intelligent control unit adopts the mean method (average value method) to calculate the gas density value, and the mean method is: within a set time interval, set the collection frequency, and perform average calculation processing on all N gas density values ​​collected at different time points to obtain its gas density value; or, within a set time interval, set the temperature interval step, perform average calculation processing on the density values ​​corresponding to N different temperature values ​​collected within the entire temperature range to obtain its gas density value; or, within a set time interval, set the pressure interval step, perform average calculation processing on the density values ​​corresponding to N different pressure values ​​collected within the entire pressure change range to obtain its gas density value; wherein N is a positive integer greater than or equal to 1.

[0093] Preferably, the gas density relay body includes, but is not limited to, a bimetallic compensated gas density relay, a gas compensated gas density relay, a bimetallic and gas compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a gas density relay with a pointer display, a digital gas density relay, a gas density switch without display or indication; an SF6 gas density relay, a SF6 mixed gas density relay, and an N2 gas density relay.

[0094] Preferably, the electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment.

[0095] Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas charging cabinets, and ring network cabinets.

[0096] Preferably, the contact signal sampling of the gas density relay body by the online verification contact signal sampling unit satisfies the following conditions: the online verification contact signal sampling unit has at least two independent groups of sampling contacts, and can automatically complete the verification of at least two contacts at the same time, and continuously measure without changing contacts or reselecting contacts; wherein,

[0097] The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a locking contact, an alarm contact + a locking 1 contact + a locking 2 contact, and an alarm contact + a locking contact + an overpressure contact.

[0098] Preferably, the test voltage of the online verification contact signal sampling unit for the contact signal action value or the switching value of the gas density relay body is not less than 24V, that is, during verification, a voltage of not less than 24V is applied between the corresponding terminals of the contact signal.

[0099] Preferably, the intelligent control unit automatically controls the entire verification process, including all peripherals, logics, and inputs and outputs, based on the embedded system algorithm and control program of the microprocessor.

[0100] More preferably, the intelligent control unit automatically controls the entire verification process, including all peripherals, logic and input and output, based on embedded algorithms and control programs of general-purpose computers, industrial computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc.

[0101] Preferably, the intelligent control unit has an electrical interface, which completes test data storage, and / or test data export, and / or test data printing, and / or data communication with a host computer, and / or inputs analog and digital information.

[0102] Preferably, the gas density relay or gas density monitoring device supports input of basic information, and the basic information includes one or more of factory number, accuracy requirements, rated parameters, manufacturer, and operating position.

[0103] Preferably, the intelligent control unit also includes a communication module for realizing long-distance transmission of test data and / or verification results.

[0104] More preferably, the communication mode of the communication module is wired communication or wireless communication.

[0105] Furthermore, the wired communication method includes one or more of RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable.

[0106] Furthermore, the wireless communication method includes one or more of NB-IOT, 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

[0107] Preferably, the intelligent control unit is also provided with a clock, and the clock is configured to periodically set the calibration time of the gas density relay body, or record the test time, or record the event time.

[0108] Preferably, the intelligent control unit is controlled through on-site control and / or through background control.

[0109] More preferably, the gas density relay or gas density monitoring device completes the online verification of the gas density relay body according to the settings or instructions of the background; or,

[0110] According to the set calibration time of the gas density relay body, the online calibration of the gas density relay body is completed.

[0111] Preferably, the gas density relay or gas density monitoring device further comprises: a display interface for human-computer interaction, connected to the intelligent control unit, displaying current calibration data in real time, and / or supporting data input.

[0112] Preferably, the gas density relay or gas density monitoring device further includes: a camera for monitoring.

[0113] Preferably, the gas density relay body comprises: a housing, and a base, a pressure detector, a temperature compensation element, and a plurality of signal generators arranged in the housing; the first interface of the multi-way connector is connected to the base; the online verification contact signal sampling unit is connected to the signal generator;

[0114] Among them, the signal generator includes a micro switch or a magnetic-assisted electric contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes a Baden tube or a bellows; the temperature compensation element uses a temperature compensation sheet or a gas enclosed in a shell.

[0115] More preferably, at least one of the temperature sensors is arranged near the temperature compensation element of the gas density relay body, or arranged on the temperature compensation element, or integrated into the temperature compensation element. Preferably, at least one of the temperature sensors is arranged at one end of the pressure detector of the gas density relay body close to the temperature compensation element.

[0116] More preferably, the gas density relay body further comprises a display mechanism, the display mechanism comprises a movement, a pointer, and a dial, the movement is fixed on the base or in the housing; one end of the temperature compensation element is further connected to the movement through a connecting rod or directly connected to the movement; the pointer is mounted on the movement and arranged in front of the dial, and the pointer displays the gas density value in combination with the dial; and / or

[0117] The display mechanism includes a digital device or a liquid crystal device with a value display.

[0118] More preferably, the gas density relay or gas density monitoring device also includes a contact resistance detection unit; the contact resistance detection unit is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay body is isolated from its control circuit, and when the contact signal is actuated and / or when an instruction to detect the contact resistance of the contact is received, the contact resistance detection unit can detect the contact resistance value of the gas density relay body.

[0119] More preferably, the gas density relay or gas density monitoring device also includes an insulation resistance detection unit; the insulation resistance detection unit is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay is isolated from its control circuit, and when the contact signal of the gas density relay is actuated and / or when an instruction to detect the contact insulation resistance is received, the insulation resistance detection unit can detect the contact insulation resistance value of the gas density relay.

[0120] The third aspect of the present application provides a method for calibrating a gas density relay, comprising:

[0121] In normal working state, the gas density relay monitors the gas density value in the electrical equipment;

[0122] The gas density relay or gas density monitoring device shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions that allow calibration of the gas density relay:

[0123] The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit. The isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component. The isolation piece isolates the gas path connection between the first interface and the second interface. As the isolation piece moves, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure, so that the gas density relay body undergoes contact action. The contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body.

[0124] When all contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation member of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected.

[0125] Preferably, a method for calibrating a gas density relay comprises:

[0126] In normal working state, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment. At the same time, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit;

[0127] The gas density relay or gas density monitoring device shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions that allow calibration of the gas density relay:

[0128] The online verification contact signal sampling unit is directly or indirectly adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit;

[0129] The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit. The isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component. The isolation piece isolates the gas path connection between the first interface and the second interface. As the isolation piece moves, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure, so that the gas density relay body undergoes contact action. The contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay, and completes the verification of the contact signal action value of the gas density relay;

[0130] The intelligent control unit drives the gas path isolation pressure regulating mechanism to slowly increase the gas pressure, so that the gas density relay body contacts are reset. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value at the time of contact reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay body, and completes the verification of the contact signal return value of the gas density relay body.

[0131] When all the contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation member of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected, and the online verification contact signal sampling unit is adjusted to the working state, and the control circuit of the contact signal of the gas density relay body resumes normal working state.

[0132] Preferably, a method for calibrating a gas density relay comprises:

[0133] The gas density relay or gas density monitoring device also includes a temperature regulating mechanism; the method includes:

[0134] In normal working state, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment. At the same time, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit;

[0135] The gas density relay or gas density monitoring device shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions that allow calibration of the gas density relay:

[0136] The online verification contact signal sampling unit is directly or indirectly adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay and connects the contact of the gas density relay body to the intelligent control unit;

[0137] The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit, and the isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component, and the isolation piece isolates the gas path connection between the first interface and the second interface. With the movement of the isolation piece, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure. The temperature compensation element of the gas density relay body is increased by the control of the temperature regulating mechanism by the intelligent control unit, so that the gas density relay body undergoes contact action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body;

[0138] The intelligent control unit drives the gas path isolation pressure regulating mechanism to slowly increase the gas pressure, and the intelligent control unit controls the temperature regulating mechanism to reduce the temperature of the temperature compensation element of the gas density relay body, so that the gas density relay body resets the contacts. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value at the time of contact reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay, and completes the verification of the contact signal return value of the gas density relay body;

[0139] When all the contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected, and the intelligent control unit turns off the heating element of the temperature regulating mechanism, and adjusts the online verification contact signal sampling unit to the working state, and the control circuit of the contact signal of the gas density relay body resumes normal working state.

[0140] Preferably, the contact signal includes an alarm and / or a lock.

[0141] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or,

[0142] Use a gas density transmitter consisting of a pressure sensor and a temperature sensor; or,

[0143] Density sensor using quartz tuning fork technology.

[0144] Preferably, after the gas density relay completes the calibration, if there is any abnormality, it can automatically issue an alarm, and upload it to a remote end, or send it to a designated receiver.

[0145] Preferably, the verification method further comprises: displaying the gas density value and the verification result on-site, or displaying the gas density value and the verification result through the background.

[0146] Preferably, the verification method further comprises: the intelligent control unit is controlled through on-site control and / or through background control.

[0147] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0148] The present application provides a gas density relay with an online self-checking function and a check method thereof, which are used for high-voltage and medium-voltage electrical equipment, and include a gas density relay body, a gas density detection sensor, a gas path isolation pressure regulating mechanism, an online check contact signal sampling unit and an intelligent control unit. The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit, and the partition member of the gas path isolation pressure regulating mechanism moves under the action of a driving component, and the partition member isolates the gas path connection between the first interface and the second interface, and with the movement of the partition member, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce or increase the gas pressure, so that the gas density relay body has a contact action or reset, and the contact action or reset is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the alarm and / or locking contact signal action value and / or return value of the gas density relay body according to the density value when the contact is in action, and the gas density relay can be checked without the need for maintenance personnel to go to the site, thereby improving the reliability of the power grid, improving efficiency, reducing costs, and realizing maintenance-free gas density relays. At the same time, the entire calibration process achieves zero emission of SF6 gas, which complies with environmental protection regulations. In particular, no electric control valve is required, which makes the sealing performance better, the volume smaller, and easy to modify on site, improves reliability, and is conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0149] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0150] Figure 1 It is a structural schematic diagram of the gas density relay with online self-checking function in working state of the first embodiment;

[0151] Figure 2 It is a structural schematic diagram of the gas density relay with online self-checking function in the online check state of the first embodiment;

[0152] Figure 3 1 is a circuit diagram of a gas density relay with an online self-checking function according to Embodiment 1;

[0153] Figure 4 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to Embodiment 2;

[0154] Figure 5 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to Embodiment 3;

[0155] Figure 6 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to a fourth embodiment;

[0156] Figure 7 is a schematic structural diagram of a gas density relay body according to a preferred embodiment;

[0157] Figure 8 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to a fifth embodiment;

[0158] Fig. 9 is a structural schematic diagram of a gas density relay with an online self-checking function according to a sixth embodiment;

[0159] Fig.10 It is a structural schematic diagram of a gas density relay with an online self-checking function according to a seventh embodiment. DETAILED DESCRIPTION

[0160] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0161] Embodiment 1:

[0162] like Figure 1 As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by Embodiment 1 of the present invention comprises: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, and an electrical device 8. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, and the intelligent control unit 7 are arranged on the gas path isolation pressure regulating mechanism 5. Figure 1 The present invention is a schematic diagram of the working state of a gas density relay or a gas density monitoring device with an online self-checking function.

[0163] Specifically, the gas path partition pressure regulating mechanism 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a seal coupling 508, a fourth interface 509, and a contact signal interlocking component 5K. The partition 502 is arranged in the sealed cavity 501, and the partition 502 is connected to the driving component 505 through the connector 504 and the seal coupling 508. The driving component 505 can be one of, including but not limited to, magnetic force, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic element, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, and chemical reaction thrust mechanism. The heating thrust mechanism, such as heating a bimetallic strip, will generate thrust. The driving component 505 is to move the partition 502 to cut off the gas circuit of the electrical equipment, to isolate the gas density relay body 1 from the gas circuit of the electrical equipment 8, and at the same time to adjust the gas pressure rise and fall of the gas density relay body 1, so that the contacts of the gas density relay body 1 can be actuated or reset. The partition 502 is in sealing contact with the inner wall of the sealed cavity 501; the partition 502 includes, but is not limited to, a piston and a sealing isolator. The sealing coupling 508 is arranged together with the sealed cavity 501, and the connecting member 504 is connected to the driving component 505 through the sealing coupling 508. Specifically, a fifth interface is provided at one end of the sealed cavity 501, and the first interface 506 is closer to the fifth interface 530 than the second interface 507, or the first interface 506 is farther away from the fifth interface 530 than the second interface 507, that is, the partition 502 cannot block the first interface 506 and the second interface 507 at the same time. The sealing coupling 508 is arranged at the fifth interface 530 of the sealing cavity 501, one end of which is sealedly connected to the fifth interface 530, and the other end of which is sealedly connected to the driving end of the driving component 505, or the other end of which seals and wraps the driving component 505 in the sealing coupling 508. One end of the connecting member 504 is connected to the partition member 502, and the other end passes through the sealing coupling 508 and is connected to the driving component 505. The sealing coupling 508 includes, but is not limited to, one of a bellows, an airbag, and a sealing ring. The relative positions of the first interface 506 and the second interface 507 of the gas path isolation pressure regulating mechanism 5 are staggered. The second interface 507 of the gas path isolation pressure regulating mechanism 5 is directly or indirectly connected to the electrical device 8, and the first interface 506 of the gas path isolation pressure regulating mechanism 5 is directly or indirectly connected to the gas density relay body 1; the pressure sensor 2 is connected to the fourth interface 509 of the gas path isolation pressure regulating mechanism 5.In the working state, the sealed cavity 501 of the gas path isolation pressure regulating mechanism 5 is connected to the gas path of the gas density relay body 1 and the electrical equipment 8; the online verification contact signal sampling unit 6 is connected to the gas density relay body 1 and the intelligent control unit 7 respectively; the pressure sensor 2, the temperature sensor 3 and the gas path isolation pressure regulating mechanism 5 are connected to the intelligent control unit 7 respectively; the isolation sampling element of the online verification contact signal sampling unit 6 is set corresponding to the contact signal interlocking part 5K, and during verification, the contact signal interlocking part 5K can cut off the contact signal control circuit of the gas density relay body 1 to ensure that the contact action signal of the gas density relay body 1 will not be uploaded during verification, thereby not affecting the safe operation of the power grid. The isolation sampling element of the online verification contact signal sampling unit 6 includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, and an optical coupler.

[0164] Among them, the gas density relay body 1 includes: a bimetallic compensated gas density relay, a gas compensated gas density relay, or a bimetallic and gas compensated mixed 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 an indication (a density relay with a pointer display, or a density relay with a digital display, a density relay with a liquid crystal display), a density relay without an indication (i.e., a density switch); a SF6 gas density relay, a SF6 mixed gas density relay, a N2 gas density relay, other gas density relays, and the like.

[0165] like Figure 3 As shown, the intelligent control unit 7 is mainly composed of a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) can be a general-purpose computer, an industrial computer, a CPU, a single-chip microcomputer, an ARM chip, an AI chip, an MCU, an FPGA, a PLC, an industrial control mainboard, an embedded main control board, and other intelligent integrated circuits. The power supply 72 (U2) can be a switching power supply, an AC 220V, a DC power supply, an LDO, a programmable power supply, solar energy, a storage battery, a rechargeable battery, a battery, an electric field induction power supply, a magnetic field induction power supply, a wireless charging power supply, a capacitor power supply, and the like.

[0166] Types of pressure sensor 2: absolute pressure sensor, relative pressure sensor, or absolute pressure sensor and relative pressure sensor, the number can be several. Pressure sensor 2 can be in the form of diffused silicon pressure sensor, MEMS pressure sensor, chip pressure sensor, coil induction pressure sensor (such as Baden tube with induction coil pressure measurement sensor), resistance pressure sensor (such as Baden tube with sliding wire resistance pressure measurement sensor); it can be an analog pressure sensor or a digital pressure sensor. Pressure acquisition is a variety of pressure sensing elements such as pressure sensors and pressure transmitters, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistance strain gauge, ceramic strain gauge).

[0167] The temperature sensor 3 can be: a thermocouple, a thermistor, a semiconductor type; it can be a contact type or a non-contact type; it can be a thermal resistor or a thermocouple. In short, temperature acquisition can be performed using various temperature sensing elements such as a temperature sensor, a temperature transmitter, etc.

[0168] The gas path isolation pressure regulating mechanism 5 of this embodiment is mainly composed of a sealing cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a seal coupling 508, a fourth interface 509, and a contact signal interlocking component 5K. The sealing cavity 501 includes a seal coupling 508, and the seal coupling 508 is composed of a bellows. The partition 502 provided with a partition seal 503 is arranged in the sealing cavity 501, and the partition 502 is connected to the driving component 505 through the connector 504 and the seal coupling 508. The driving component 505 is composed of a motor, or an electric push rod motor, or a stepping motor, and a reciprocating motion mechanism. The partition 502 is in sealing contact with the inner wall of the sealing cavity 501 through the partition seal 503; the partition 502 includes, but is not limited to, one of a piston and a sealing isolation component. Since the sealing member coupling member 508 is arranged together with the sealing cavity 501, the connecting member 504 is connected to the driving component 505 through the sealing member coupling member 508, thus ensuring that the entire calibration process is sealed.

[0169] like Figure 3 As shown, the online verification contact signal sampling unit 6 is controlled by the contact signal interlocking part 5K, and mainly completes the contact signal sampling of the gas density relay body 1. That is, the basic requirements or functions of the online verification contact signal sampling unit 6 are: 1) It does not affect the safe operation of electrical equipment during verification. That is, during verification, when the contact signal of the gas density relay body 1 is activated, it will not affect the safe operation of electrical equipment; 2) The contact signal control circuit of the gas density relay body 1 does not affect the performance of the gas density relay, especially the performance of the intelligent control unit 7, and will not damage the gas density relay or affect the test work.

[0170] The basic requirements or functions of the intelligent control unit 7 are: to complete the control and signal collection of the gas path isolation pressure adjustment mechanism 5 through the intelligent control unit 7. Realization: It can isolate the gas path of the first interface and the second interface, and then isolate the gas path of the density relay body and the electrical equipment during verification, and can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 is activated, and convert it into the corresponding pressure value P at 20°C 20 (density value), that is, the contact action value P of the gas density relay body 1 can be detected D20 , complete the calibration work of the gas density relay body 1. Alternatively, the density value P when the contact signal of the gas density relay body 1 is actuated can be directly detected. D20 , complete the calibration work of the gas density relay body 1.

[0171] Of course, the intelligent control unit 7 can also achieve: complete test data storage; and / or test data export; and / or test data can be printed; and / or data communication with the host computer can be performed; and / or analog and digital information can be input. The intelligent control unit 7 also includes a communication module, through which the long-distance transmission of test data and / or verification results and other information is realized; when the rated pressure value of the gas density relay body 1 outputs a signal, the intelligent control unit 7 simultaneously collects the density value at that time to complete the rated pressure value verification of the gas density relay body 1. At the same time, through the test of the rated pressure value of the gas density relay body 1, the self-verification work between the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 can be completed to achieve maintenance-free.

[0172] Electrical equipment, including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment. Specifically, electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas charging cabinets, ring main cabinets, etc.

[0173] The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the gas path isolation pressure regulating mechanism 5, the online calibration contact signal sampling unit 6, the intelligent control unit 7 and / or the multi-way connector can be flexibly arranged as needed. For example, the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be arranged together; or the pressure sensor 2 and the gas path isolation pressure regulating mechanism 5 can be arranged together. In short, the settings between them can be flexibly arranged and combined. The sealed cavity 501 can be hollow or partially hollow, and its shape cooperates with the partition 502. When used in conjunction with the partition 502, it can adjust the gas pressure change.

[0174] The working principle of a gas density relay or gas density monitoring device with online self-checking function: the intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3, and obtains the corresponding 20℃ pressure value P 20 (i.e., gas density value, i.e., online monitoring gas density value). When it is necessary to calibrate the gas density relay body 1, if the gas density value P 20 ≥Set safety verification density value P S The gas density relay (or density monitoring device) issues an instruction, that is, the intelligent control unit 7 drives the driving component 505 of the gas path isolation pressure regulating mechanism 5, and the driving component 505 pushes the connecting member 504 to move, thereby causing the isolation member 502 and the isolation sealing member 503 to move toward the first interface 506 and the second interface 507. Figure 2 and Figure 3 As shown, during the movement, the contact signal sampling unit 6 cuts off the control loop of the contact signal of the gas density relay through the contact signal interlocking piece 5K, and connects the contact of the gas density relay body 1 to the intelligent control unit 7. Because the gas density relay has already carried out the gas density value P before starting the calibration 20 ≥Set safety verification density value P S The monitoring and judgment shows that the gas of the electrical equipment is within the safe operating range, and the gas leakage is a slow process, so it is safe during the verification. With the movement of the partition member 502 and the partition seal 503, the first interface 506 and the second interface 507 are isolated from each other under the isolation effect of the partition member 502 and the partition seal 503. That is, the partition member 502 and the partition sealing member 503 of the gas path partition pressure regulating mechanism 5 move toward the first interface 506 and the second interface 507 under the action of the driving component 505. When the partition member 502 passes the first interface 506, the partition member 502 isolates the gas path connection between the first interface 506 and the second interface 507, and as the partition member 502 continues to move toward the second interface 507, the volume of the sealed cavity 501 changes, and the pressure of the gas density relay body 1 can be adjusted to slowly reduce the gas pressure, so that the gas density relay body 1 has a contact action, and the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 collects the pressure value P and the temperature value T of the pressure sensor 2 and the temperature sensor 3 when the contact is in action, and then calculates the gas density value P 20 , or directly obtain the gas density value P 20 , detect the contact signal action value P of the gas density relay body 1 D20 , complete the calibration of the contact signal action value of the gas density relay. That is, the intelligent control unit 7 converts the pressure value P corresponding to 20°C according to the gas pressure-temperature relationship characteristics. 20(density value), the contact action value P of the gas density relay body 1 can be detected D20 After all the contact action values ​​of the alarm and / or locking signals of the gas density relay body 1 are detected, the gas path isolation pressure adjustment mechanism 5 is driven by the intelligent control unit 7, and the isolation member 502 moves toward the first interface 506. The volume of the sealed cavity 501 changes, and the pressure of the gas density relay body 1 can be adjusted to slowly increase the gas pressure, so that the gas density relay body 1 resets the contacts. The contact reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and the temperature value T when the contact is reset. 20 , or directly obtain the gas density value P 20 , detect the contact signal return value P of the gas density relay F20 , complete the contact signal return value P of the gas density relay F20 The calibration can be repeated for multiple times (for example, 2 to 3 times), and then the average value is calculated, thus completing the calibration of the gas density relay body 1.

[0175] When all the contact signal verification work is completed, the intelligent control unit 7 controls the gas path isolation pressure regulating mechanism 5, and the isolation member 502 of the gas path isolation pressure regulating mechanism 5 moves under the action of the driving component 505, so that the gas paths of the first interface 506 and the second interface 507 of the gas path isolation pressure regulating mechanism 5 are connected to each other (such as Figure 1 As shown), with the movement of the contact signal interlocking member 5K, the online verification contact signal sampling unit 6 is adjusted to the working state, and the control circuit of the contact signal of the gas density relay body 1 resumes the normal working state. Figure 1 As shown: At this time, the gas paths of the first interface 506 and the second interface 507 of the gas path isolation pressure regulating mechanism 5 are interconnected, that is, the gas density relay body 1 is connected to the electrical equipment 8 on the gas path, and the gas density relay body 1 (or the gas density monitoring device) normally monitors the gas density of the gas chamber of the electrical equipment, and can monitor the gas density of the electrical equipment online. That is, the density monitoring circuit of the gas density relay body 1 works normally, and the gas density relay body 1 safely monitors the gas density of the electrical equipment 8, so that the electrical equipment 8 can work safely and reliably. In this way, it is convenient to complete the online verification of the gas density relay body 1, and at the same time, the online verification of the gas density relay body 1 will not affect the safe operation of the electrical equipment 8.

[0176] When the gas density relay body 1 completes the calibration work, the gas density relay or gas density monitoring device will make a judgment and can announce the test results in a flexible way. Specifically, it can: 1) The gas density relay can be announced on the spot, such as through indicator lights, digital or LCD displays; 2) or the gas density relay can be uploaded through online remote communication, such as uploading to the background of the online monitoring system; 3) or uploaded wirelessly to a specific terminal, such as wirelessly uploading to a mobile phone; 4) or uploaded through other channels; 5) or upload abnormal results through an alarm signal line or a dedicated signal line; 6) Upload alone, or upload with other signals. In short, after the gas density relay completes the online calibration work of the gas density relay body 1, if there is an abnormality, it can automatically issue an alarm, which can be uploaded to the remote end, or can be sent to a designated receiver, such as to a mobile phone. Alternatively, after the gas density relay or gas density monitoring device completes the calibration work of the gas density relay body 1, if there is an abnormality, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay body 1 to the remote end (monitoring room, background monitoring platform, etc.), and can also display the notice on the spot. The simple version of the online calibration of the gas density relay can upload the abnormal calibration results through the alarm signal line. It can be uploaded in a certain pattern. For example, when abnormal, a contact is connected in parallel with the alarm signal contact, and it is closed and disconnected regularly, and the status can be obtained through analysis; or it can be uploaded through an independent calibration signal line. Specifically, it can be uploaded when the status is good, or when there is a problem, or it can be uploaded through remote density online monitoring, or the calibration results can be uploaded through a separate calibration signal line, or through local display, local alarm, or wireless upload, and upload through the Internet with a smart phone. The communication mode is wired or wireless. The wired communication mode can be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; the wireless communication mode can be 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, sensor built-in 5G / NB-IOT communication module (such as NB-IOT), etc. In short, multiple modes and multiple combinations can be used to fully guarantee the reliable performance of the gas density relay.

[0177] The gas density relay has a safety protection function. Specifically, when the gas density value is lower than the set value, the gas density relay or gas density monitoring device will automatically stop online verification of the density relay body 1 and send out a warning signal. For example, when the gas density value of the equipment is less than the set value P S For example, online calibration can only be performed when the gas density value of the equipment is ≥ (alarm pressure value + 0.02MPa).

[0178] The gas density relay or gas density monitoring device can be calibrated online according to the set time, or according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). When calibrating at high temperature, low temperature, normal temperature, and 20°C ambient temperature online, the error judgment requirements are different. For example, when calibrating at 20°C ambient temperature, the accuracy requirement of the gas density relay can be 1.0 or 1.6, and it can be 2.5 at high temperature. It can be implemented according to the temperature requirements and relevant standards. For example, according to the temperature compensation performance provisions in Article 4.8 of DL / T 259 "Calibration Procedure for Sulfur Hexafluoride Gas Density Relay", the accuracy requirements corresponding to each temperature value.

[0179] The gas density relay or gas density monitoring device can compare the error performance of the density relay at different temperatures and different time periods. That is, the comparison within the same temperature range at different periods can determine the performance of the gas density relay and electrical equipment. It can compare various historical periods and compare the history with the present.

[0180] The gas density relay can be calibrated repeatedly for multiple times (for example, 2 to 3 times), and the average value can be calculated based on the calibration results each time. If necessary, the gas density relay can be calibrated online at any time.

[0181] The gas density relay or gas density monitoring device has the functions of pressure, temperature measurement and software conversion. Under the premise of not affecting the safe operation of electrical equipment, the alarm and / or locking contact action value and / or return value of the gas density relay body 1 can be detected online. Of course, the return value of the alarm and / or locking contact signal can also be not tested according to requirements. At the same time, the gas density relay (or gas density monitoring device) can also monitor the gas density value, pressure value, and / or temperature value of electrical equipment online, and upload them to the target device to realize online monitoring.

[0182] Embodiment 2:

[0183] like Figure 4 As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by Embodiment 2 of the present invention comprises: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a gas path isolation pressure regulating mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, an electrical device 8, and a multi-way connector 9. The pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the gas density relay body 1.

[0184] Figure 4It is a schematic diagram of the working state of a gas density relay or a gas density monitoring device with an online self-calibration function. Specifically, the gas path isolation pressure regulating mechanism 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a drive component 505, a first interface 506, a second interface 507, a third interface 511, a connector seal 510, and a cavity (or housing) 512. One end of the valve 4 is connected to the third interface 511, and the other end of the valve 4 is connected to the multi-way connector 9. The first interface 506 is arranged at a position between the second interface 507 and the third interface 511. The connector 504 is sealed with the sealed cavity 501 through the connector seal 510; wherein the partition 502 is arranged in the sealed cavity 501, and the partition 502 is connected to the drive component 505 through the connector 504; the connector 504, the drive component 505, and the connector seal 510 are sealed in the cavity (or housing) 512. The cavity (or housing) 512 has a good seal with the sealed cavity 501, that is, the cavity (or housing) 512 ensures that the gas path isolation pressure regulating mechanism 5 has a good sealing performance. The gas density relay body 1 is installed on the gas path isolation pressure regulating mechanism 5; the gas path isolation pressure regulating mechanism 5 is installed on the multi-way connector 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1, and the pressure sensor 2 is connected to the gas density relay body 1 on the gas path. In the working state, the gas path isolation pressure regulating mechanism 5 is connected to the gas density relay body 1; the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the gas path isolation pressure regulating mechanism 5 are respectively connected to the intelligent control unit 7. The multi-way connector 9 is also connected to the gas replenishment interface.

[0185] The control of valve 4 can adopt a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; it can act according to the predetermined requirements under the action of pressure, temperature or other forms of sensor signals, or simply open or close without relying on sensor signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts move up and down, slide, swing or rotate, thereby changing the size of its flow channel area to achieve its control function. The valve 4 can be an automatic valve type, a power-driven valve type and a manual valve type according to the drive mode. The automatic valve can 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 drive, motor (motor) drive. The valve can be automatic, manual or semi-automatic. The calibration process can be completed automatically or semi-automatically through manual cooperation. The valve 4 is directly or indirectly connected to the electrical equipment through a self-sealing valve, a manual valve, or a non-disassembly valve, and is connected in an integrated or separate manner. The valve 4 can be normally open or normally closed, one-way or two-way as required. In short, the gas circuit is opened or closed by the electric control valve 4. The electric control valve 4 can be: a solenoid valve, an electric control ball valve, an electric valve, an electric control proportional valve, etc.

[0186] The difference from the first embodiment is that the gas path isolation pressure regulating mechanism 5 of this embodiment is mainly that the connector 504 is sealed with the sealed cavity 501 through the connector seal 510; the connector 504, the driving component 505, and the connector seal 510 are sealed in the cavity (or shell) 512. The cavity (or shell) 512 and the sealed cavity 501 have a good seal, that is, the cavity (or shell) 512 ensures that the gas path isolation pressure regulating mechanism 5 has a good sealing performance. The biggest difference is: this embodiment also includes a valve 4, and the valve 4 is used to complete the calibration of the density relay body with the overpressure alarm contact function. As in the first embodiment, after the alarm and / or locking contact action value and / or return value of the gas density relay body 1 is detected online, the partition 502 is adjusted to (or automatically set to) a suitable position, such as close to the second interface 507, and then the valve 4 is controlled by the intelligent control unit 7, that is, the valve 4 is opened by the intelligent control unit 7. At this time, the gas of the electrical equipment 8 enters the gas density relay body 1, so that the pressure of the gas density relay body 1 is increased to the set pressure value or directly increased to the gas pressure value of the electrical equipment 8, and then the valve 4 is closed by the intelligent control unit 7. Then, the gas path isolation pressure regulating mechanism 5 is driven by the intelligent control unit 7, and the partition 502 moves toward the third interface 511, sealing the cavity 501 ( Figure 4The volume of the right side of the middle partition 502 changes, which can adjust the pressure of the gas density relay body 1, so that the gas pressure rises slowly, so that the overpressure alarm contact of the gas density relay body 1 is actuated, and the signal of the overpressure alarm contact actuation is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the overpressure alarm contact is actuated. 20 , or directly obtain the gas density value P 20 , detect the contact signal value P of the overpressure alarm contact of the gas density relay C20 , complete the overpressure alarm contact signal value P of the gas density relay body 1 C20 The gas path isolation pressure regulating mechanism 5, under the control of the intelligent control unit 7, causes the driving component 505 to push the isolation member 502 to move, causing the sealed cavity 501 to change in volume, thereby completing the pressure drop and detecting the contact signal value P of the overpressure alarm contact of the gas density relay to reset. CF20 , complete the overpressure alarm contact signal return value P of the gas density relay body 1 CF20 calibration work.

[0187] Embodiment three:

[0188] like Figure 5 As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by the third embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism 5, an online verification contact signal sampling unit 6, an intelligent control unit 7, an electrical device 8, a multi-way connector 9 and a gas supply connector 10. The gas path isolation pressure regulating mechanism 5 includes a sealing cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 513, 514, a first interface 506, and a second interface 507. The gas density relay body 1 is installed on the gas path isolation pressure regulating mechanism 5; the pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The gas path isolation pressure regulating mechanism 5 is installed on the multi-way connector 9, and the pressure sensor 2 is connected to the gas density relay body 1 on the gas path; the gas supply connector 10 is arranged on the multi-way connector 9. The pressure sensor 2 and the temperature sensor 3 are connected to the intelligent control unit 7 ; the gas path isolation pressure regulating mechanism 5 is connected to the intelligent control unit 7 .

[0189] The biggest difference from the first embodiment is that the driving component of the gas path isolation pressure regulating mechanism 5 of this embodiment is composed of a power driving member 513 and a driven member 514, and the partition member 502, the connecting member 504, and the driven member 514 are arranged inside the sealed cavity 501. The partition member 502 is connected to the driven member 514 through the connecting member 504. According to the control of the intelligent control unit 7, the power driving member 513 pushes the driven member 514 to move, thereby moving the partition member 502, and then causing the volume of the sealed cavity 501 to change, thereby completing the pressure rise and fall. The power driving member 513 is arranged outside the sealed cavity 501, and the driven member 514 is arranged inside the sealed cavity 501. The power driving member 513 applies electromagnetic force to push the driven member 514 to move, that is, the driven member 514 and the partition member 502 are moved by magnetic force between the driven member 514 and the power driving member 513. This embodiment can be implemented in combination with a magnetically coupled rodless cylinder.

[0190] Embodiment 4:

[0191] like Figure 6 As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by the fourth embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism 5, an online verification contact signal sampling unit 6, an intelligent control unit 7, and an electrical device 8. The pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the gas density relay body 1; the gas density relay body 1 is arranged on the gas path isolation pressure regulating mechanism 5. Further, the gas path isolation pressure regulating mechanism 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a sealing component coupling 508, and a cavity (or housing) 512; the sealing component coupling 508 can be composed of a bellows. The connecting component 504, the driving component 505, and the sealing component coupling 508 are sealed and arranged inside the cavity (or housing) 512. The second interface 507 of the gas path isolation pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a connector.

[0192] The difference from the first embodiment is that the connector 504, the driving component 505, and the sealing connector 508 of this embodiment are sealed inside the cavity (or housing) 512, further improving the sealing performance and ensuring the safe operation of the power grid. In addition, the partition can be directly connected to the driving component through the sealing connector; or the partition and the connector are designed as an integrated whole and directly connected to the driving component.

[0193] Figure 7 This is a schematic diagram of the structure of a gas density relay body 1 according to a preferred embodiment of the present application. Figure 7As shown, a gas density relay body 1 comprises: a housing 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, and a dial 107 arranged in the housing 101. One end of the pressure detector 103 is fixed on the base 102 and communicated with it, and the other end of the pressure detector 103 is connected to one end of the temperature compensation element 104 through the end seat 108. The other end of the temperature compensation element 104 is provided with a crossbeam, and the crossbeam is provided with an adjustment member for pushing the signal generator 109 to connect or disconnect the contact of the signal generator 109. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected to the movement 105 through a connecting rod or directly connected to the movement 105; the pointer 106 is installed on the movement 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay body 1 can also include a digital device or a liquid crystal device with a display. Among them, the signal generator 109 includes a micro switch or a magnetic auxiliary electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 includes a Baden tube or a bellows; the temperature compensation element 104 uses a temperature compensation sheet or a gas enclosed in a shell. The gas density relay body 1 of this embodiment can also include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge.

[0194] In the gas density relay body 1 of the present embodiment, the pressure detector 103 and the temperature compensation element 104 are used to correct the changing pressure and temperature to reflect the change in the density of sulfur hexafluoride gas. That is, under the pressure of the sulfur hexafluoride (SF6) gas to be measured, due to the effect of the temperature compensation element 104, when the density value of sulfur hexafluoride gas changes, the pressure value of sulfur hexafluoride gas also changes accordingly, forcing the end of the pressure detector 103 to produce a corresponding elastic deformation displacement, which is transmitted to the movement 105 with the help of the temperature compensation element 104, and the movement 105 is transmitted to the pointer 106, so that the measured sulfur hexafluoride gas density value is indicated on the dial 107. The signal generator 109 is used as an output alarm locking contact. In this way, the gas density relay body 1 can display the sulfur hexafluoride gas density value. If there is a gas leak, the density of sulfur hexafluoride gas decreases, and the pressure detector 103 produces a corresponding downward displacement, which is transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 transmits it to the pointer 106. The pointer 106 moves in the direction of a smaller indication, and the degree of gas leakage is specifically displayed on the dial 107. At the same time, the pressure detector 103 drives the crossbeam to move downward through the temperature compensation element 104, and the adjustment part on the crossbeam gradually moves away from the signal generator 109. When it reaches a certain degree, the contact of the signal generator 109 is connected, and a corresponding contact signal (alarm or lockout) is issued, so as to monitor and control the density of sulfur hexafluoride gas in equipment such as electrical switches, so that the electrical equipment can work safely.

[0195] If the gas density value increases, that is, the sulfur hexafluoride gas pressure value in the sealed gas chamber is greater than the set sulfur hexafluoride gas pressure value, the pressure value also increases accordingly, and the end of the pressure detector 103 and the temperature compensation element 104 produce a corresponding upward displacement. The temperature compensation element 104 causes the crossbeam to also move upward, and the adjustment part on the crossbeam moves upward and pushes the contact of the signal generator 109 to disconnect, and the contact signal (alarm or lockout) is released.

[0196] Embodiment five:

[0197] like Figure 8As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by Embodiment 5 of the present invention comprises: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, and an electrical device 8. The pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the gas density relay body 1; the gas density relay body 1 is arranged on the gas path isolation pressure regulating mechanism 5. Furthermore, the gas path isolation pressure regulating mechanism 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component composed of a heating device 516 and a bimetallic strip 515 (i.e., an electric heating thrust generating mechanism), a first interface 506, a second interface 507, a connecting component 517, a sliding component 518, a heat insulating component 519, and a cavity (or a housing); the connecting component 504, the driving component composed of the heating device 516 and the bimetallic strip 515, the connecting component 517 and the sliding component 518 are sealed and arranged inside the cavity (or housing). The second interface 507 of the gas path isolation pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a joint.

[0198] The difference from the first embodiment is that the driving component, connecting component 517 and sliding component 518 composed of the connecting component 504, the heating device 516 and the bimetallic strip 515 of this embodiment are sealed inside the cavity (or shell), further improving the sealing performance and ensuring the safe operation of the power grid. The driving component of this case is composed of the heating device 516 and the bimetallic strip 515. When the heating device 516 is powered on and heated, the bimetallic strip 515 expands, pushing the connecting component 517 and the sliding component 518 to move, and then pushing the connecting component 504 to move, and then pushing the partition 502 to move, completing the isolation of the gas path and the regulation of pressure.

[0199] Embodiment six:

[0200] like Fig. 9As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by Embodiment 6 of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism 5, an online verification contact signal sampling unit 6, an intelligent control unit 7, and an electrical device 8. The pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the intelligent control unit 7 are arranged on the gas density relay body 1; the gas density relay body 1 is arranged on the gas path isolation pressure regulating mechanism 5. Further, the gas path isolation pressure regulating mechanism 5 includes a sealed cavity 501, a partition 502, a partition seal 503A, a partition seal 503B, a connector 504A, a connector 504B, a driving component 505, a first interface 506, a second interface 507, a capillary 520, and a cavity (or housing) 512. The second interface 507 of the gas path isolation pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a joint. The sealed cavity 501 is composed of a bellows 508, a partition 502, and a plugging member 521; on the gas path, the gas density relay body 1 is connected to the first interface 506 of the gas path partition pressure regulating mechanism 5 through a spiral capillary 520. The sealed cavity 501 is also provided with a fixed point (not shown in the figure) whose position cannot be changed, such as a point where the wall of the sealed cavity 501 is fixedly connected to the external housing 512, and the driving component 505 can be installed or connected to the fixed point to prevent the position of the driving component 505 from changing.

[0201] What is different from the first embodiment is that when this case is working, the intelligent control unit 7 controls the driving component 505, thereby causing the connecting component 504B to move downward, thereby pushing the partition component 502 to move downward, closing the gas path of the second interface 507, and isolating the gas density relay body 1 and the electrical equipment 8 in the gas path; and at the same time or subsequently, causing the connecting component 504A to move upward, thereby pushing the blocking component 521 to move upward, causing the bellows 508 to expand, causing the volume of the sealed cavity 501 to change, thereby adjusting the pressure to drop, or increase, and completing the calibration of the density relay body 1. In this case, the partition member 502 can be moved downward first to close the air path of the second interface 507, and then the connecting member 504A can be moved upward, thereby pushing the blocking member 521 upward to expand the bellows 508 and cause the volume of the sealed cavity 501 to change, thereby adjusting the pressure to drop or increase; or, the partition member 502 can be moved downward to close the air path of the second interface 507, and at the same time the connecting member 504A can be moved upward, thereby pushing the blocking member 521 upward to expand the bellows 508 and cause the volume of the sealed cavity 501 to change, thereby adjusting the pressure to drop or increase. The partition member 502 can be moved downward and the blocking member 521 can be moved upward at the same time. When the partition member 502 moves downward, the gas path of the second interface 507 is closed and remains closed; while the blocking member 521 can continue to move upward, so that the bellows 508 expands and the volume of the sealed cavity 501 changes, thereby adjusting the pressure to drop or increase. The driving component 505 can be arranged inside or outside the sealed cavity 501.

[0202] Embodiment seven:

[0203] like Fig.10As shown, a gas density relay or gas density monitoring device with an online self-calibration function provided by Embodiment 7 of the present invention includes: a gas density relay body 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a gas path isolation pressure regulating mechanism 5, an online calibration contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, a gas supply interface 10, and a self-sealing valve 11. One end of the self-sealing valve 11 is sealed and connected to the electrical equipment 8, and the other end of the self-sealing valve 11 is connected to the multi-way connector 9. The second pressure sensor 21, the second temperature sensor 22, the gas path isolation pressure regulating mechanism 5, and the gas supply interface 10 are arranged on the multi-way connector 9; the first pressure sensor 21 and the first temperature sensor 31 are arranged on the gas path isolation pressure regulating mechanism 5. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31, and the second temperature sensor 32 are respectively connected to the intelligent control unit 7. The first pressure sensor 21 , the second pressure sensor 22 , and the gas density relay body 1 are connected to the gas path isolation pressure regulating mechanism 5 on the gas path; the gas path isolation pressure regulating mechanism 5 is connected to the intelligent control unit 7 .

[0204] Different from the first embodiment, there are two pressure sensors, namely the first pressure sensor and the second pressure sensor; there are two temperature sensors, namely the first temperature sensor and the second temperature sensor. This embodiment provides multiple pressure sensors and temperature sensors, the purpose of which is that: the pressure values ​​monitored by the first pressure sensor and the second pressure sensor can be compared and verified with each other; the temperature values ​​monitored by the first temperature sensor and the second temperature sensor can be compared and verified with each other; the density value P1 monitored by the first pressure sensor and the first temperature sensor 20 , and the density value P2 monitored by the second pressure sensor and the second temperature sensor 20 Compare and verify each other; even the density value Pe of the rated value of the gas density relay body 1 can be obtained online. 20 , compare and check each other. Further ensure the reliability of density relay or density monitoring device, automatically monitor and compare, and achieve maintenance-free.

[0205] It can also contain a moisture sensor for monitoring the moisture content of electrical equipment and a decomposition product sensor for monitoring the decomposition product content.

[0206] In addition, the technical product of the present invention can also have a safety protection function, specifically: 1) When the density value monitored by the first pressure sensor and the first temperature sensor or the second pressure sensor and the second temperature sensor is lower than the set value, the gas density relay will automatically stop checking the gas density relay body and send a warning signal. For example, when the gas density value of the device is less than the set value, it will not be checked. Only when the gas density value of the device is ≥ (locking pressure + 0.02MPa), can it be checked. The docking point alarm has a status indication. 2) Or during the calibration, the valve is closed at this time, and when the density value monitored by the second pressure sensor and the second temperature sensor is lower than the set value, the gas density relay will automatically stop checking the gas density relay body and send a warning signal (leakage). For example, when the gas density value of the device is less than the set value (locking pressure + 0.02MPa), it will not be checked. The set value can be set arbitrarily according to needs. At the same time, the gas density relay also has mutual verification of multiple pressure sensors and temperature sensors, as well as mutual verification of sensors and gas density relays, to ensure that the gas density relay works normally. That is, the pressure values ​​monitored by the first pressure sensor and the second pressure sensor are compared and verified with each other; the temperature values ​​monitored by the first temperature sensor and the second temperature sensor are compared and verified with each other; the density value P1 monitored by the first pressure sensor and the first temperature sensor 20 , and the density value P2 monitored by the second pressure sensor and the second temperature sensor 20 Compare and verify each other; even verify the density value Pe of the rated value of the gas density relay body 20 , compare and verify each other.

[0207] In summary, the present invention provides a gas density relay with an online self-calibration function and a calibration method thereof, which is composed of a gas circuit (can be through a pipeline) connection part, a pressure regulating part, a signal measurement control part, etc. The main function is to perform online calibration measurement of the contact value of the gas density relay body (the pressure value during the alarm / locking action), and automatically convert it into the corresponding pressure value at 20°C, and realize the performance detection of the contact (alarm and lockout) value of the gas density relay body online. The installation positions of the gas density relay body, pressure sensor, temperature sensor, gas circuit isolation pressure regulating mechanism, online calibration contact signal sampling unit, and intelligent control unit can be flexibly combined. For example: the gas density relay body, pressure sensor, temperature sensor, online calibration contact signal sampling unit, and intelligent control unit can be combined together, integrated design, or split design; can be installed on the housing, or on a multi-way joint, or can be connected together through a connecting pipe. The valve can be directly connected to the electrical equipment, or it can be connected through a self-sealing valve or a gas pipe. Pressure sensors, temperature sensors, online calibration contact signal sampling units, and intelligent control units can be combined together for an integrated design; pressure sensors, temperature sensors can be combined together for an integrated design; online calibration contact signal sampling units, and intelligent control units can be combined together for an integrated design. In short, the structure is not limited to one style.

[0208] A gas density relay with an online self-checking function generally refers to a gas density relay whose components are designed as an integrated structure; while a gas density monitoring device generally refers to a gas density relay whose components are designed as a separate structure with flexible composition.

[0209] The gas density relay with online self-checking function can have different error judgment requirements when checking the contacts of the density relay at high temperature, low temperature, normal temperature and 20℃ ambient temperature. It can be implemented according to the temperature requirements and relevant standards. It can compare the error performance of the density relay at different temperatures and different time periods. That is, the performance of the density relay can be judged by comparing different periods within the same temperature range. It can compare the historical periods and the history with the present. It can also perform a physical examination on the density relay body. If necessary, it can check the contact signal of the density relay at any time. It can judge whether the density value of the gas density relay body and the monitored electrical equipment is normal. That is, it can judge, analyze and compare the density value of the electrical equipment itself, the gas density relay body, the pressure sensor and the temperature sensor, and then judge, compare and analyze the gas density monitoring of the electrical equipment and the status of the gas density relay body. It also monitors the contact signal status of the gas density relay and transmits its status remotely. The contact signal status of the gas density relay can be known in the background: open or closed, thereby adding a layer of monitoring to improve reliability; the temperature compensation performance of the gas density relay body can also be detected, or detected and determined; the contact resistance of the gas density relay body can also be detected, or detected and determined; the insulation performance of the gas density relay body can also be detected, or detected and determined.

[0210] The application has a compact and reasonable structure, and each component has good anti-rust and anti-vibration capabilities, is firmly installed, and is reliable to use. The connection and disassembly of each pipeline of the gas density relay are easy to operate, and the equipment and components are easy to maintain. The application can complete the calibration of the gas density relay without the need for maintenance personnel to go to the site, which greatly improves the reliability of the power grid, improves efficiency, and reduces costs.

[0211] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A gas density relay with online self-checking function, characterized in that: include: Gas density relay body, gas density detection sensor, gas path isolation pressure adjustment mechanism, online calibration contact signal sampling unit and intelligent control unit; The gas density detection sensor is connected to the gas density relay body; The gas path of the gas density relay body is connected to the first interface of the gas path isolation pressure regulating mechanism; The gas path isolation pressure regulating mechanism is also provided with a second interface connected to the electrical device, and the gas path isolation pressure regulating mechanism is configured to isolate the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action; The online verification contact signal sampling unit is directly or indirectly connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body; An intelligent control unit is connected to the gas density detection sensor, the gas path isolation pressure regulating mechanism and the online verification contact signal sampling unit, respectively, and is configured to complete the control of the gas path isolation pressure regulating mechanism, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body; Wherein, the contact signal includes alarm and / or lock.

2. The gas density relay according to claim 1, characterized in that: The gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or, The gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas path isolation pressure regulating mechanism; the gas path isolation pressure regulating mechanism is arranged on the gas density relay body; or, The gas density detection sensor, the gas path isolation pressure adjustment mechanism, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or, The gas density detection sensor is arranged on the gas density relay body; or, The gas density detection sensor is arranged on the gas path isolation pressure regulating mechanism; or, The gas density relay body is arranged on the gas path isolation pressure regulating mechanism; or, The online verification contact signal sampling unit and the intelligent control unit are arranged on the gas path isolation pressure regulating mechanism.

3. The gas density relay according to claim 1, characterized in that: The gas density relay body and the gas density detection sensor are an integrated structure.

4. The gas density relay according to claim 3, characterized in that: The gas density relay body and the gas density detection sensor are a remote transmission gas density relay with an integrated structure.

5. The gas density relay according to claim 1, characterized in that: The gas density detection sensor is an integrated structure.

6. The gas density relay according to claim 1, characterized in that: The gas density detection sensor is a gas density transmitter with an integrated structure.

7. The gas density relay according to claim 6, characterized in that: The online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

8. The gas density relay according to claim 1, characterized in that: The online verification contact signal sampling unit and the intelligent control unit are arranged together.

9. The gas density relay according to claim 1, characterized in that: The online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a housing.

10. The gas density relay according to claim 1, characterized in that: The gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, Use a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, Density sensor using quartz tuning fork technology.

11. The gas density relay according to claim 10, characterized in that: The pressure sensor is installed on the gas path of the gas density relay body or on the gas path isolation pressure regulating mechanism; The temperature sensor is installed on or outside the gas path of the gas density relay body, or inside the gas density relay body, or outside the gas density relay body.

12. The gas density relay according to claim 1, characterized in that: The intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay.

13. The gas density relay according to claim 1, characterized in that: The intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and completes the online verification of the gas density relay; or The intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and converts it into a pressure value corresponding to 20°C, that is, the gas density value, according to the gas pressure-temperature characteristics, to complete the online verification of the gas density relay.

14. The gas density relay according to claim 1, characterized in that: The gas density relay body has a density comparison value output signal, and the density comparison value output signal is connected to the intelligent control unit; or, The gas density relay body is provided with a comparative pressure value output signal, and the comparative pressure value output signal is connected to the intelligent control unit.

15. The gas density relay according to claim 1, characterized in that: The gas path isolation pressure regulating mechanism includes a sealed cavity and a partition member in the sealed cavity, and the first interface and the second interface are both arranged on the wall of the sealed cavity and connected to the internal space of the sealed cavity; the partition member is configured to isolate the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body so that the gas density relay body generates a contact signal action.

16. The gas density relay according to claim 15, characterized in that: The gas path isolation pressure regulating mechanism further includes a connecting member and a driving component, and the isolation member is connected to the driving component via the connecting member; or, The partition and the connecting piece are designed to be integrated and directly connected to the driving component; or, The partition member is associated with the driving member through magnetic coupling; Wherein, the driving component includes one of a magnet, a motor, a Carnot cycle mechanism, a compressor, a vent valve, a boost pump, a boost valve, a pneumatic element, a heating thrust generating mechanism, and a chemical reaction thrust generating mechanism.

17. The gas density relay according to claim 16, characterized in that: A fifth interface is provided at one end of the sealing cavity, one end of the connecting member is connected to the partition member, and the other end passes through the fifth interface and is connected to the driving component.

18. The gas density relay according to claim 17, characterized in that: The first interface is closer to the fifth interface than the second interface, or the first interface is farther away from the fifth interface than the second interface.

19. The gas density relay according to claim 17, characterized in that: The air path isolation pressure regulating mechanism also includes a sealing connector, which is arranged at the fifth interface of the sealing cavity, and the other end of the connecting member passes through the sealing connector to be connected to the driving component; the sealing connector includes one of a bellows, an airbag, and a sealing ring.

20. The gas density relay according to claim 16, characterized in that: The sealing cavity is a retractable cavity, the driving component is located in the sealing cavity and is provided with driving ends in two directions; the connecting member includes a first connecting member and a second connecting member, which are respectively connected to the driving ends in two directions; wherein the other end of the first connecting member is connected to the inner wall of the sealing cavity; the other end of the second connecting member is connected to the partition member, the partition member is provided with a through hole to connect the interior of the sealing cavity with the second interface, and a sealing member is provided on the side of the partition member facing the second interface, and the sealing member is arranged around the through hole.

21. The gas density relay according to claim 20, characterized in that: The two driving ends face in opposite directions.

22. The gas density relay according to claim 16, characterized in that: During verification, the partition piece of the gas path isolation pressure regulating mechanism moves under the drive of the driving component, and the partition piece isolates the gas path connection between the first interface and the second interface. The gas pressure in the sealed cavity changes with the position of the partition piece, which is used to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action.

23. The gas density relay according to claim 15, characterized in that: The edge of the partition piece is in sealing contact with the inner wall of the sealed cavity.

24. The gas density relay according to claim 23, characterized in that: The partition member includes one of a piston and a sealing isolation member.

25. The gas density relay according to claim 1, characterized in that: The gas path isolation pressure regulating mechanism is sealed in a cavity.

26. The gas density relay according to claim 1, characterized in that: The online verification contact signal sampling unit includes an isolation sampling element, which is controlled by the gas density relay body, or the gas path isolation pressure regulating mechanism, or the intelligent control unit; in the non-verification state, the online verification contact signal sampling unit is relatively isolated from the contacts of the gas density relay body in the circuit through the isolation sampling element; in the verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay body through the isolation sampling element, and connects the contacts of the gas density relay body with the intelligent control unit.

27. The gas density relay according to claim 26, characterized in that: The isolation sampling element includes one of an electric switch, a displacement switch, an optical coupler, and a thyristor.

28. The gas density relay according to claim 1, characterized in that: It also includes a valve, and the gas path isolation pressure regulating mechanism is also provided with a third interface; one end of the valve is connected to the third interface of the gas path isolation pressure regulating mechanism, and the other end of the valve is directly or indirectly connected to the electrical equipment; the first interface is located between the second interface and the third interface.

29. The gas density relay according to claim 1, characterized in that: Also includes: A trace water sensor connected to the gas density relay body and the intelligent control unit respectively, and / or a decomposition product sensor connected to the gas density relay body and the intelligent control unit respectively.

30. The gas density relay according to claim 1, characterized in that: It also includes a temperature regulating mechanism, which is a temperature-adjustable regulating mechanism and is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body, and then cooperate with or / and combine with the gas path isolation pressure regulating mechanism to cause the gas density relay body to generate a contact signal action; the intelligent control unit is connected to the temperature regulating mechanism to complete the control of the temperature regulating mechanism.

31. The gas density relay according to claim 30, characterized in that: The temperature regulating mechanism comprises a heating element, a heat-insulating component, a temperature controller, a temperature detector and a temperature regulating mechanism housing.

32. The gas density relay according to claim 30, characterized in that: The temperature adjustment mechanism includes a heating element and a temperature controller.

33. The gas density relay according to claim 30, characterized in that: The temperature adjustment mechanism includes a heating element, a heating power adjuster and a temperature controller.

34. The gas density relay according to claim 30, characterized in that: The temperature adjustment mechanism includes a heating element, a cooling element, a power regulator and a temperature controller.

35. The gas density relay according to claim 30, characterized in that: The temperature regulating mechanism comprises a heating element, a heating power regulator and a constant temperature controller.

36. The gas density relay according to claim 30, characterized in that: The temperature adjustment mechanism includes a heating element, a temperature controller and a temperature detector.

37. The gas density relay according to claim 30, characterized in that: The temperature adjustment mechanism is a heating element, and the heating element is arranged near the temperature compensation element.

38. The gas density relay according to claim 30, characterized in that: The temperature regulating mechanism is a micro thermostatic box.

39. The gas density relay according to any one of claims 31 to 37, characterized in that: The number of the heating element is at least one, and the heating element includes one of a silicone rubber heater, a resistance wire, an electric belt, an electric heating rod, a hot air blower, an infrared heating device, and a semiconductor.

40. The gas density relay according to claim 31 or 32 or 33 or 34 or 36, characterized in that: The temperature controller is connected to the heating element and is used to control the heating temperature of the heating element. The temperature controller includes a PID controller or a controller combining PID and fuzzy control.

41. The gas density relay according to claim 1, characterized in that: At least two gas density relay bodies, at least two gas path isolation pressure adjustment mechanisms, at least two online verification contact signal sampling units, an intelligent control unit and a gas density detection sensor to complete the online verification of the gas density relay; or, At least two gas density relay bodies, at least two gas path isolation pressure adjustment mechanisms, at least two online verification contact signal sampling units, at least two intelligent control units and a gas density detection sensor to complete the online verification of the gas density relay; or, At least two gas density relay bodies, at least two gas path isolation pressure regulating mechanisms, at least two online verification contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are used to complete the online verification of the gas density relay.

42. The gas density relay according to claim 1, characterized in that: Also includes: A multi-way connector, the gas density relay body and the gas path isolation pressure regulating mechanism are arranged on the multi-way connector; or, The gas path isolation pressure regulating mechanism is fixed on the multi-way connector; or, The gas density relay body, the gas density detection sensor and the gas path isolation pressure regulating mechanism are arranged on the multi-way connector.

43. A gas density monitoring device with online self-calibration function, characterized in that: The gas density monitoring device comprises a gas density relay with an online self-checking function as described in any one of claims 1 to 42.

44. A method for calibrating a gas density relay, characterized in that: include: In normal working state, the gas density relay monitors the gas density value in the electrical equipment; The gas density relay shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions where the gas density relay is allowed to be calibrated: The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit, and the isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component, and the isolation piece isolates the gas path connection between the first interface and the second interface. With the movement of the isolation piece, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure, so that the gas density relay body undergoes contact action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body; When all contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation member of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected.

45. A method for calibrating a gas density relay according to claim 44, characterized in that: include: In normal working state, the gas density relay monitors the gas density value in the electrical equipment. At the same time, the gas density relay monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit; The gas density relay shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions where the gas density relay is allowed to be calibrated: The online verification contact signal sampling unit is directly or indirectly adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit; The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit. The isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component. The isolation piece isolates the gas path connection between the first interface and the second interface. As the isolation piece moves, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure, so that the gas density relay body undergoes contact action. The contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay, and completes the verification of the contact signal action value of the gas density relay; The intelligent control unit drives the gas path isolation pressure regulating mechanism to slowly increase the gas pressure, so that the gas density relay body resets the contacts. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value at the time of contact reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay body, and completes the verification of the contact signal return value of the gas density relay body. When all the contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation member of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected, and the online verification contact signal sampling unit is adjusted to the working state, and the control circuit of the contact signal of the gas density relay body resumes normal working state.

46. ​​A method for calibrating a gas density relay according to claim 44, characterized in that: The gas density relay also includes a temperature adjustment mechanism; the method includes: In normal working state, the gas density relay monitors the gas density value in the electrical equipment. At the same time, the gas density relay monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit; The gas density relay shall, according to the set calibration time and / or calibration instruction, as well as the gas density value, under the conditions where the gas density relay is allowed to be calibrated: The online verification contact signal sampling unit is directly or indirectly adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the control loop of the contact signal of the gas density relay and connects the contact of the gas density relay body to the intelligent control unit; The gas path isolation pressure regulating mechanism is controlled by the intelligent control unit, and the isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component, and the isolation piece isolates the gas path connection between the first interface and the second interface. With the movement of the isolation piece, the volume of the sealed cavity changes, and the pressure of the gas density relay body can be adjusted to slowly reduce the gas pressure. The temperature compensation element of the gas density relay body is increased by the control of the temperature regulating mechanism by the intelligent control unit, so that the gas density relay body undergoes contact action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body; The intelligent control unit drives the gas path isolation pressure regulating mechanism to slowly increase the gas pressure, and the intelligent control unit controls the temperature regulating mechanism to reduce the temperature of the temperature compensation element of the gas density relay body, so that the gas density relay body resets the contacts. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value at the time of contact reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay, and completes the verification of the contact signal return value of the gas density relay body; When all the contact signal verification work is completed, the intelligent control unit controls the gas path isolation pressure regulating mechanism, and the isolation piece of the gas path isolation pressure regulating mechanism moves under the action of the driving component, so that the gas paths of the first interface and the second interface of the gas path isolation pressure regulating mechanism are interconnected, and the intelligent control unit turns off the heating element of the temperature regulating mechanism, and adjusts the online verification contact signal sampling unit to the working state, and the control circuit of the contact signal of the gas density relay body resumes normal working state.

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