Maintenance-free gas density relay and method for mutual inspection thereof

Abstract

This application provides a maintenance-free gas density relay and a method for mutual verification thereof, including a gas density relay body and a first gas density detection sensor connected via a gas path, and a smart control unit connected to the gas density relay body and the first gas density detection sensor; the smart control unit compares and verifies first and second pressure values ​​collected at the same gas pressure, compares and verifies first and second temperature values ​​collected at the same gas temperature, or compares and verifies first and second density values ​​collected at the same gas density; the smart control unit can upload received data in the background and perform data comparison in the background. This application solves the gas density monitoring problem for gas-insulated or arc-extinguishing electrical equipment, and achieves online self-verification or mutual verification of the gas density relay, improving efficiency, eliminating maintenance, reducing costs, and ensuring the safe operation of the power grid.

Description

[Technical field]

[0001] This application claims priority from the following patent applications: 1. Application No. 201910830162.0 filed on September 4, 2019 (Invention name: Maintenance-free gas density relay); 2. Application No. 202010416678.3 filed on May 15, 2020 (Name of invention: Maintenance-free gas density relay).

[0002] Technical Field The present disclosure relates to the field of electric power technology, and in particular to a maintenance-free gas density relay and its mutual inspection method, which are applied to high-voltage and medium-voltage electrical equipment. [Background technology]

[0003] Background technology At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied in the power sector and mining enterprises, promoting the rapid development of the power industry. In recent years, with the rapid development of the economy, the capacity of the power system in our country has expanded rapidly, and the use of SF6 electrical equipment is becoming more and more. 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 trace moisture content exceeds the standard, it will have a serious impact on the safe operation of SF6 high-voltage electrical equipment: 1) When the density of SF6 gas decreases to a certain extent, the insulation and arc extinguishing performance will be lost. 2) Under the action of some metal substances, SF6 gas will react with water hydrolyzed at a high temperature of more than 200℃ to produce reactive HF and SOF2, which can corrode insulating materials and metal materials, generate a large amount of heat, and increase the pressure in the gas chamber. 3) When the temperature decreases, the excess moisture will form condensation water, which will significantly reduce the insulation strength of the insulating material surface, and even cause flashback, which will cause serious danger. Therefore, power grid operation regulations mandatorily stipulate that the density and water content of SF6 gas must be detected periodically before and during operation of the equipment.

[0004] With the future of networking and digitalization of unmanned substations and the ever-increasing requirements for remote control and remote measurement, online monitoring of the gas density and trace moisture content status of SF6 electrical equipment has important practical significance. In China, with the continuous and rapid development of smart power grids, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a major role in the safety of smart power grids. High-voltage electrical equipment is currently mostly SF6 gas-insulated equipment, and if the gas density decreases (for example, due to leakage, etc.), it will have a serious impact on the electrical performance of the equipment and pose a serious risk to safe operation. Online monitoring of gas density values ​​in SF6 high-voltage electrical equipment is now very common, and the application of gas density monitoring systems (gas density relays) for this purpose is becoming more and more popular. The current gas density monitoring system (gas density relay) is basically as follows: 1) A remote SF6 gas density relay is applied to realize the collection and uploading of density, pressure and temperature, and realize online monitoring of gas density. 2) A gas density transmitter is applied to realize the collection and uploading of density, pressure and temperature, and realize online monitoring of gas density. The SF6 gas density relay is a key element and an important component, and the remote SF6 gas density relay or gas density transmitter is a key element and an important component, and how to ensure its normal operation is very important.

[0005] Periodic inspection of gas density relays in electrical equipment is a necessary measure to protect electrical equipment from danger and ensure safe and reliable operation. Both the "Electricity Prevention Testing Procedure" and the "25 Key Requirements for Preventing Major Accidents in Electricity Production" require periodic inspection of gas density relays. From the perspective of actual operation, periodic inspection of gas density relays is one of the necessary measures to ensure the safety and reliable operation of power equipment. In addition, inspection or testing of gas density online monitoring devices or remote density relays requires a large amount of manpower and materials.

[0006] Therefore, there is currently a need to invent and create a maintenance-free gas density relay or gas density monitoring device, which can be applied to a gas density monitoring system based on the ubiquitous Internet of Power Things, and can realize mutual verification between the mechanical parts and the electrical parts of the gas density relay, thereby realizing maintenance-free operation, improving efficiency, and ensuring safety. Summary of the Invention [Problem to be solved by the invention]

[0007] The present disclosure provides a maintenance-free gas density relay (or gas density monitoring device) and its mutual verification method for use in high voltage or medium voltage electrical equipment, which monitors the gas density of gas-insulated or arc-extinguishing electrical equipment, and also completes online self-detection or mutual verification of the gas density relay, thereby improving efficiency, eliminating the need for maintenance, reducing operating maintenance costs, and ensuring the safe operation of the power grid. [Means for solving the problem]

[0008] To achieve the above objectives, the present disclosure employs the following technical solutions: A first aspect of the present application provides a maintenance-free gas density relay including a gas density relay body, a first gas density detection sensor, and a smart control unit, The first gas density detection sensor is in gas path communication with the gas density relay body and is used to collect pressure and temperature values ​​and / or gas density values, and the smart control unit is connected to the gas density relay body and / or the first gas density detection sensor, and receives and / or calculates monitoring data of the gas density relay body and the first gas density detection sensor; the smart control unit verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the smart control unit verifies a first temperature value and a second temperature value collected at the same gas temperature, or the smart control unit verifies a first density value and a second density value collected at the same gas density to obtain a current operating status of the monitoring portion of the gas density relay; or the smart control unit uploads the received data to a background, and the background verifies the first and second pressure values ​​collected at the same gas pressure, and / or the background verifies the first and second temperature values ​​collected at the same gas temperature, or the background verifies the first and second density values ​​collected at the same gas density, and obtains a current operating status of the monitoring portion of the gas density relay; The present invention discloses a maintenance-free gas density relay (or gas density monitoring device) in which one or both of the first pressure value and the second pressure value are from the first gas density detection sensor or the gas density relay main body, one or both of the first temperature value and the second temperature value are from the first gas density detection sensor or the gas density relay main body, one or both of the first density value and the second density value are from the first gas density detection sensor or the gas density relay main body, and one or both of the first temperature value and the second temperature value are from the first gas density detection sensor or the gas density.

[0009] Preferably, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) includes a normal operating state and an abnormal operating state.

[0010] More preferably, if the current operating condition is an abnormal operating condition, the gas density relay (or gas density monitor) issues an abnormal indication.

[0011] Preferably, the gas density relay (or the gas density monitoring device) includes at least two first gas density detection sensors, each of which includes one pressure sensor and one temperature sensor, and the pressure value and temperature value or gas density value detected by each first gas density detection sensor are compared to complete mutual verification of each first gas density detection sensor.

[0012] Preferably, the gas density relay (or the gas density monitoring device) further includes a second gas density detection sensor, and the first gas density detection sensor and the second gas density detection sensor each include a pressure sensor and a temperature sensor, and the pressure value and the temperature value or the gas density value of the first gas density detection sensor are compared with the pressure value and the temperature value or the gas density value of the second gas density detection sensor to complete mutual verification of the first gas density detection sensor and the second gas density detection sensor.

[0013] More preferably, the pressure value collected by either the first gas density detection sensor or the second gas density detection sensor is a first pressure value P A and the temperature value collected by the temperature sensor is a first temperature value T A The pressure value collected by the other of the first gas density detection sensor and the second gas density detection sensor is a second pressure value P B and the temperature value collected by the temperature sensor is a second temperature value T B the smart control unit and / or background detects the first pressure value P A and the second pressure value P B and the pressure difference |P A -P B |Get the first temperature value T A and the second temperature value T B and the temperature difference |T A -T B Get |Pressure difference|P A -P B | and / or temperature difference |T A -T BIf | are within the respective preset thresholds, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state; otherwise, it is an abnormal operating state.

[0014] More preferably, the gas density value collected by either the first gas density detection sensor or the second gas density detection sensor is a first density value P A20 and the other collected gas density value is a second density value P B20 the smart control unit and / or background determines a first density value P A20 and a second density value P B20 and the density difference |P A20 -P B20 | is obtained, and the density difference |P A20 -P B20 If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0015] More preferably, the number of the second gas density detection sensors is at least two, and each second gas density detection sensor includes one pressure sensor and one temperature sensor; the pressure value and the temperature value or the gas density value detected by each second gas density detection sensor are compared to complete mutual verification of each second gas density detection sensor.

[0016] More preferably, the matching verification method includes, but is not limited to, one of the following: the corresponding differences are within their respective preset thresholds, the detection values ​​are within their respective preset ranges, and the division value of two corresponding detection values ​​is within their respective preset thresholds.

[0017] Preferably, the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, or the first gas density detection sensor is a gas density transmitter consisting of a pressure sensor and a temperature sensor, or the first gas density detection sensor is a density detection sensor that employs quartz tuning fork technology. Specifically, the density detection sensor of the quartz tuning fork technology uses the difference between a certain resonant frequency of a quartz oscillator in a vacuum and the resonant frequency of a quartz oscillator of the same source in a measured gas, and obtains an analog or digital signal of the gas density value proportional to the density of the measured gas after processing.

[0018] More preferably, the pressure sensor is mounted in the gas path of the gas density relay body.

[0019] More preferably, the temperature sensor is mounted in the gas path of the gas density relay body, or outside the gas path, or within the gas density relay body, or outside the gas density relay body.

[0020] More preferably, the at least one temperature sensor is provided adjacent to or at or integrated with the temperature compensating element of the gas density relay body. Preferably, the at least one temperature sensor is provided at one end of the gas density relay body close to the temperature compensating element of the pressure detector.

[0021] More preferably, the smart control unit and / or background checks the environmental temperature value against the temperature value collected by each temperature sensor to complete the verification of each temperature sensor.

[0022] Furthermore, the temperature value collected by any one of the temperature sensors is a first temperature value T A and the environmental temperature value is a second temperature value T B and the smart control unit and / or background detects a first temperature value T A and the second temperature value T B and the temperature difference |T A -T B Get |Temperature difference|T A -T B If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0023] Furthermore, the environmental temperature value is obtained by comprehensively judging the temperature values ​​of other detection points in a system consisting of a gas density relay (or a gas density monitoring device); or is obtained based on a weather forecast; or is obtained by comprehensively judging the temperature values ​​of other detection points in the same substation.

[0024] More preferably, the first gas density detection sensor includes at least two pressure sensors, and the pressure values ​​collected by each pressure sensor are collated to complete mutual verification of each pressure sensor.

[0025] Furthermore, the pressure value collected by any one of the pressure sensors is a first pressure value P A and the pressure value collected by the other pressure sensor is a second pressure value P B and the smart control unit and / or background detects a first pressure value P A and the second pressure value P B and the pressure difference |P A -P B Get |Pressure differential measurement|P A -P B If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0026] More preferably, the first gas density detection sensor includes at least two temperature sensors, and the temperature values ​​collected by each temperature sensor are collated to complete mutual verification of each temperature sensor.

[0027] Furthermore, the temperature value collected by any one of the temperature sensors is a first temperature value T A and the temperature value collected by the other temperature sensor is a second temperature value T B and the smart control unit and / or background detects a first temperature value T A the second temperature value T B and the temperature difference |T A -T B |T A -T BIf | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0028] More preferably, the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor are randomly arranged and combined, and each combination is converted into a plurality of pressure values ​​corresponding to 20°C, i.e., gas density values, according to the gas pressure-temperature characteristics, and each gas density value is compared to complete mutual verification for each pressure sensor and each temperature sensor; or The pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor are sequentially accessed through all the combinations, and each combination is converted into a number of pressure values ​​corresponding to 20°C, i.e., gas density values, according to the gas pressure-temperature characteristics, and each gas density value is compared to complete mutual verification for each pressure sensor and each temperature sensor; or A plurality of gas density values, pressure values, and temperature values ​​obtained from each pressure sensor and each temperature sensor are collated to complete mutual verification for the gas density relay body, each pressure sensor, and each temperature sensor. The above can be completed in the background or by a smart control unit.

[0029] More preferably, the temperature sensor may be of the thermocouple, thermistor, semiconductor type; may be of the contact type or non-contact type; may be of the thermal resistance and thermocouple type; may be of the digital type or analog type.

[0030] More preferably, the pressure sensor may be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-based pressure sensor, a coil inductive pressure sensor (e.g., a pressure sensor having an inductive coil associated with a bus tube), a resistive pressure sensor (e.g., a pressure sensor having a sliding wire resistor associated with a bus tube); an analog or digital pressure sensor.

[0031] Preferably, the gas density relay (or the gas density monitoring device) further includes a temperature adjustment mechanism, the temperature adjustment mechanism is a temperature adjustable adjustment mechanism, and the temperature adjustment mechanism is arranged to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body to change the gas density of the gas density relay body; the smart control unit is configured to adjust the first density value P output when the contact of the gas density relay body operates. X20 The contact signal value is collected, and the preset contact signal value is the second density value P B20 and the smart control unit and / or background detects a first density value P X20 and a second density value P B20 and the contact signal difference |P X20 -P B20 Get |Contact signal difference|P X20 -P B20 If | is within the preset threshold, then the current operating condition of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating condition; otherwise, it is an abnormal operating condition.

[0032] Preferably, the gas density relay (or the gas density monitoring device) further includes a pressure adjusting mechanism, the pressure adjusting mechanism being a pressure adjustable adjusting mechanism, and the pressure adjusting mechanism is arranged to adjust the pressure rise and fall of the gas density relay body, thereby changing the gas density of the gas density relay body; the smart control unit is configured to output a first density value P when the gas density relay body is operated to contact the first density value P. X20 The contact signal value is collected, and the preset contact signal value is the second density value P B20 and the smart control unit and / or background detects a first density value P X20 and a second density value P B20 and the contact signal difference |P X20 -P B20 Get |Contact signal difference|P X20 -P B20 If | is within the preset threshold, then the current operating condition of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating condition; otherwise, it is an abnormal operating condition. The above-mentioned preset contact signal value is a contact signal value required by the standard (rated parameters) of the gas density relay body.

[0033] More preferably, the temperature adjustment mechanism is a heating element, or The temperature adjustment mechanism includes a heating element, a heat retaining member, a temperature controller, a temperature detector, and a temperature adjustment mechanism housing; or The temperature adjustment mechanism includes a heating element and a temperature controller; or The temperature adjustment mechanism includes a heating element, a heating power regulator and a temperature controller; or The temperature adjustment mechanism includes a heating element, a cooling element, a heating power regulator, and a temperature controller; or The temperature control mechanism includes a heating element, a heating power regulator and a constant temperature controller; or The temperature control mechanism includes a heating element, a controller, and a temperature detector; or The temperature adjustment mechanism is a heating element, and the heating element is disposed adjacent to the temperature compensation element of the gas density relay body; or The temperature control mechanism is a micro thermostatic box; Wherein, the number of the heating elements is at least one, and the heating element includes, but is not limited to, one of the following: a silicon rubber heater (a silicon rubber heater plate, a silicon rubber heater belt, a silicon rubber heater line), a resistance wire, a heating wire, a heating rod, a hot air heater, an infrared heating device, and a semiconductor; The temperature controller is connected to the heating element and is used to control the heating temperature of the heating element, and the temperature controller may include, but is not limited to, one of a PID controller, a controller combining PID and fuzzy control, an inverter controller, and a PLC controller.

[0034] More preferably, the pressure adjusting mechanism is a sealed gas chamber, and a heating element and / or a cooling element are provided outside or inside the sealed gas chamber, and the heating element is heated and / or the cooling element is cooled to cause a temperature change of the gas in the sealed gas chamber, and further complete the pressure rise and fall of the gas density relay body; or the pressure adjustment mechanism is a cavity with an open end, the other end of the cavity communicating with the gas density relay body; a piston within the cavity, an adjustment rod connected to one end of the piston, a drive member connected to an outer end of the adjustment rod, the other end of the piston protruding into the opening and in sealing contact with an inner wall of the cavity, the drive member driving the adjustment rod to further drive the piston to move within the cavity; or The pressure adjustment mechanism is a sealed gas chamber, a piston is provided inside the sealed gas chamber, the piston is in sealing contact with an inner wall of the sealed gas chamber, and a driving member is provided outside the sealed gas chamber, and the driving member pushes the piston by electromagnetic force to move it inside the cavity, or The pressure adjustment mechanism is an airbag having one end connected to a driving member, the airbag undergoes a volume change when the driving member is driven, and the airbag is in communication with the gas density relay body, or The pressure adjustment mechanism is a bellows, one end of the bellows is connected to the gas density relay body, and the other end of the bellows expands and contracts when driven by a driving member, or The pressure regulating mechanism is a gas vent valve, and the gas vent valve is a solenoid valve, an electric valve, or another electric or gas vent valve; or the pressure regulation mechanism is a compressor, or The pressure regulating mechanism is a pump, the pump including but not limited to a pressure pump, a pressure booster pump, an electric air pump, and an electromagnetic air pump; Here, the driving member includes, but is not limited to, one of a magnetic force, an electric motor, a reciprocating mechanism, a Carnot cycle mechanism, and an air driving element.

[0035] Preferably, the gas density relay body includes a housing, a base disposed in the housing, a pressure detector, a temperature compensation element, a reference signal, and at least one signal generator, and the gas density relay body monitors the gas density by the pressure detector and the temperature compensation element, and outputs a contact signal value by the signal generator; The gas density relay body further has a reference pressure value output signal, when the gas pressure of the gas density relay body monitored by the pressure detector rises or falls to a set gas pressure value, the reference signal outputs the reference pressure value output signal, and the reference pressure value output signal is connected to the smart control unit; and / or The gas density relay body further has a reference density value output signal, and when the gas density of the gas density relay body monitored by the pressure detector and the temperature compensation element rises or falls to a set gas density value, the reference signal outputs a reference density value output signal, and the reference density value output signal is connected to the smart control unit.

[0036] More preferably, the contact signal includes an alarm and / or a latch.

[0037] More preferably, the reference signal includes, but is not limited to, one of a microswitch, an electrical contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, an electronic switch, a variable resistor, and a voltage or current measuring device.

[0038] More preferably, the signal generator includes, but is not limited to, one of the following: a microswitch, an electrical contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, and an electronic switch.

[0039] More preferably, the pressure detector includes one of the following, but is not limited to: a bus tube, a bellows, a bellows+spring, and a pressure sensor.

[0040] More preferably, the reference pressure value output signal outputted by the reference signal is a first pressure value P SThe pressure value collected by the first gas density detection sensor at the same time is a second pressure value P J and the smart control unit and / or background detects a first pressure value P S and the second pressure value P J and the pressure difference |P J -P S Get |Pressure difference|P J -P S If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0041] More preferably, the collation density value output signal outputted by the collation signal is a first density value P S20 The gas density value collected by the first gas density detection sensor at the same time is a second density value P J20 and the smart control unit and / or background detects a first density value P S20 and a second density value P J20 and the density difference |P J20 -P S20 Get the density difference |P J20 -P S20 If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay (or gas density monitor) is a normal operating state, otherwise, it is an abnormal operating state.

[0042] Preferably, the gas density relay or the gas density monitoring device further includes a camera, and the camera detects the first density value P of the gas density relay body through face image recognition technology. Z20 The gas density value collected by the first gas density detection sensor at the same time is the second density value P J20 and the smart control unit and / or background detects a first density value P Z20 and a second density value P J20 and the density difference |P J20 -P Z20 Get the density difference |P J20 -PZ20 If | is within the preset threshold, the current operating state of said gas density relay or the monitoring portion of the gas density monitor is a normal operating state, otherwise, it is an abnormal operating state.

[0043] Preferably, the smart control unit obtains the gas density value collected by the first gas density detection sensor, or the smart control unit obtains the pressure value and temperature value collected by the first gas density detection sensor, and completes online monitoring of the gas density of the gas density relay or gas density monitoring device, that is, completes online monitoring of the gas density of the monitored electrical equipment.

[0044] More preferably, the smart control unit calculates the gas density value using an average value method, and the average value method is as follows: within a set time interval, set a collection frequency, and perform an average value calculation process on all collected N gas density values ​​at different time points to obtain the gas density value; or At a set time interval, a temperature interval step is set, and the density values ​​corresponding to the N different temperature values ​​collected in the entire temperature range are averaged to obtain the gas density value; or A pressure interval step is set at a set time interval, and an average value calculation process is performed on density values ​​corresponding to N different pressure values ​​collected within all pressure change ranges to obtain a gas density value. Here, N is a positive integer greater than or equal to 1.

[0045] Preferably, the smart control unit obtains the gas density value collected by the first gas density detection sensor when the gas density relay body generates a contact operation or switching, and completes online verification of the gas density relay (or gas density monitor); or When the gas density relay body generates a contact operation or switching, the smart control unit obtains the pressure value and temperature value collected by the first gas density detection sensor, and converts it into a pressure value corresponding to 20°C, i.e., a gas density value, based on the gas pressure-temperature characteristics, to complete online verification of the gas density relay (or gas density monitoring device).

[0046] Preferably, the gas density relay body and the first gas density detection sensor are of an integrated structure; preferably, the gas density relay body and the first gas density detection sensor are of an integrated structure remote gas density relay.

[0047] Preferably, the gas density relay body includes, but is not limited to, bimetal compensated gas density relay, gas compensated gas density relay, bimetal and gas compensated mixed gas density relay; fully mechanical gas density relay, digital gas density relay, mechanical and digital combined gas density relay; gas density relay with pointer display, digital display gas density relay, gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay. Here, when the gas density relay main body is a digital gas density relay, the smart control unit may be built into the digital gas density relay main body (i.e., the smart control unit is integrated into an integrated circuit or chip of the digital gas density relay main body, or the integrated circuit or chip of the digital gas density relay main body itself is also considered to be the smart control unit of the present application), or the smart control unit may be provided separately outside the digital gas density relay main body (i.e., the smart control unit of the present application is not integrated into an integrated circuit or chip of the digital gas density relay main body, and the integrated circuit or chip of the digital gas density relay main body is also not considered to be the smart control unit described in the present application).

[0048] Preferably, the first gas density detection sensor is of an integrated structure; preferably, the first gas density detection sensor is of an integrated gas density transmitter structure.

[0049] Preferably, the smart control unit completes a verification report, and if there is any abnormality, it will issue an alarm and upload it to a remote location or send it to a designated receiver.

[0050] Preferably, the smart control unit is provided with an electrical interface, which can store test data, and / or derive test data, and / or print out test data, and / or communicate with a host machine, and / or input analog quantity, digital quantity information.

[0051] Preferably, the smart control unit further includes a communication module for realizing remote transmission of the test data and / or the self-verification result, and the communication method of the communication module is a wired communication method or a wireless communication method.

[0052] Preferably, the smart control unit is further provided with a clock, which is arranged to periodically set a self-verification time of the gas density relay body, or record a test time, or record an event time.

[0053] Preferably, the gas density relay (or gas density monitor) further includes a multi-contact provided with the gas density relay body, the first gas density detection sensor and the smart control unit.

[0054] Preferably, the gas density relay (or gas density monitor) further includes a display interface used for man-machine interaction, the display interface being connected to the smart control unit to display current inspection data in real time and / or support data input.

[0055] Preferably, the gas density relay (or gas density monitoring device) further includes a low-temperature water sensor connected to the gas density relay main body and the smart control unit, respectively, and / or a decomposition product sensor connected to the gas density relay main body and the smart control unit, respectively.

[0056] Preferably, the gas density relay (or gas density monitoring device) further includes: a contact resistance detection unit connected to a contact signal of the gas density relay body or directly connected to a signal generator in the gas density relay body; the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay body when the contact of the gas density relay body is operated and / or when it receives a command to detect the contact resistance of the contact.

[0057] Preferably, at least two of said gas density relays (or gas density monitors) are both connected to a remote background detection system via communication equipment; wherein said gas density relays (or gas density monitors) are provided in the electrical equipment of their corresponding gas chambers.

[0058] More preferably, the communication method of the communication equipment includes a wired communication method and a wireless communication method.

[0059] Furthermore, the wired communication method includes one or more of the following: RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable line.

[0060] Furthermore, the wireless communication method includes one or more of the following: a sensor-built-in 5G / NB-IOT communication module (e.g., 5G, NB-IOT), 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

[0061] Preferably, the smart control unit is controlled by a local control and / or by a background control.

[0062] More preferably, the smart control unit completes online verification for the gas density relay (or gas density monitor) based on the setting or remote control command of the remote background detection system, or completes online verification for the gas density relay (or gas density monitor) based on the set verification time of the gas density relay.

[0063] More preferably, at least two of said gas density relays (or gas density monitors) are in turn connected to a remote background detection system via a hub and a protocol converter; wherein said gas density relays (or gas density monitors) are provided in the electrical equipment of their corresponding gas chambers.

[0064] Furthermore, the hub adopts an RS485 hub.

[0065] Furthermore, the protocol converter adopts an IEC61850 or IEC104 protocol converter.

[0066] Additionally, the protocol converter is further coupled to a network service printer and a network data router, respectively.

[0067] A second aspect of the present application discloses a method for cross-validating a maintenance-free gas density relay, comprising: connecting a first gas density detection sensor to a gas density relay body in a gas path; Connecting a smart control unit to the gas density relay body and / or the first gas density detection sensor; The smart control unit verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the smart control unit verifies a first temperature value and a second temperature value collected at the same gas temperature, or the smart control unit verifies a first density value and a second density value collected at the same gas density, and obtains a current operating status of the monitoring portion of the gas density relay, or the smart control unit uploads the received data to a background, and the background verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the background verifies a first temperature value and a second temperature value collected at the same gas temperature, or the background verifies a first density value and a second density value collected at the same gas density, and obtains a current operating state of a monitoring portion of the gas density relay, One or both of the first pressure value and the second pressure value are from the first gas density detection sensor or the gas density relay main body, one or both of the first temperature value and the second temperature value are from the first gas density detection sensor or the gas density relay main body, and one or both of the first density value and the second density value are from the first gas density detection sensor or the gas density relay main body.

[0068] Preferably, the first gas density detection sensor is at least two, and each gas density detection sensor includes one pressure sensor and one temperature sensor; the gas density relay further includes a second gas density detection sensor, and the second gas density detection sensor includes one pressure sensor and one temperature sensor; the mutual verification method further includes: The pressure value collected by either the first gas density detection sensor or the second gas density detection sensor is a first pressure value P A and the temperature value collected by the temperature sensor is a first temperature value T A The pressure value collected by the other of the first gas density detection sensor and the second gas density detection sensor is a second pressure value PB and the temperature value collected by the temperature sensor is a second temperature value T B the smart control unit or background detects the first pressure value P A and the second pressure value P B and the pressure difference |P A -P B |Get the first temperature value T A and the second temperature value T B and the temperature difference |P A -P B Get |Pressure difference|P A -P B | and / or temperature difference |P A -P B | is respectively within a preset threshold, the current working state of the monitoring part of the gas density relay is a normal working state; otherwise, it is an abnormal working state; or The gas density value collected by either the first gas density detection sensor or the second gas density detection sensor is a first density value P A20 and the other collected gas density value is a second density value P B20 the smart control unit and / or background determines a first density value P A20 and a second density value P B20 and the density difference |P A20 -P B20 Get the density difference |P A20 -P B20 If | is within the preset threshold, the current working state of the monitoring portion of the gas density relay is a normal working state, otherwise, it is an abnormal working state.

[0069] Preferably, the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the cross-validation method further includes: The temperature value collected by any one of the temperature sensors is a first temperature value T A and the environmental temperature value is a second temperature value T B and the smart control unit and / or background detects a first temperature value T A and the second temperature value T Band the temperature difference |T A -T B |T A -T B If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is normal and does not need maintenance; otherwise, it is abnormal; or The pressure value collected by any one of the pressure sensors is the first pressure value P A and the pressure value collected by the other pressure sensor is a second pressure value P B and the smart control unit and / or background detects a first pressure value P A and the second pressure value P B and the pressure difference |P A -P B Get |Pressure difference|P A -P B If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is normal and does not need maintenance; otherwise, it is abnormal; or The temperature value collected by any of the temperature sensors is the first temperature value T A and the temperature value collected by the other temperature sensor is a second temperature value T B and the smart control unit and / or background detects a first temperature value T A and the second temperature value T B and the temperature difference |T A -T B Get |Temperature difference|T A -T B If | is within the preset threshold, the current working state of the monitoring portion of the gas density relay is a normal working state and no maintenance is required; otherwise, it is an abnormal working state.

[0070] Preferably, the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the cross-validation method further includes: Randomly arranging and combining the pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor, and converting each combination into a number of pressure values ​​corresponding to 20°C, i.e., gas density values, based on the gas pressure-temperature characteristics, and comparing each gas density value to complete mutual verification for each pressure sensor and each temperature sensor; or The pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor are sequentially accessed through all the combinations, and each combination is converted into a number of pressure values ​​corresponding to 20°C, i.e., gas density values, according to the gas pressure-temperature characteristics, and each gas density value is compared to complete mutual verification for each pressure sensor and each temperature sensor; or A plurality of gas density values, pressure values, and temperature values ​​obtained from each pressure sensor and each temperature sensor are collated to complete mutual verification for the gas density relay body, each pressure sensor, and each temperature sensor.

[0071] Preferably, the gas density relay further includes a temperature adjustment mechanism, the temperature adjustment mechanism is a temperature adjustable adjustment mechanism, and the temperature adjustment mechanism is arranged to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body to change the gas density of the gas density relay body. The temperature control mechanism is installed inside or outside the housing of the gas density relay body; the temperature control mechanism is connected to the smart control unit; The smart control unit outputs a first density value P X20 The contact signal value is collected, and the preset contact signal value is the second density value P B20 and the smart control unit and / or background detects a first density value P X20 and a second density value P B20 and the contact signal difference |P X20 -P B20 Get |Contact signal difference|P X20 -P B20If | is within the preset threshold, the current working state of the monitoring portion of the gas density relay is a normal working state and no maintenance is required; otherwise, it is an abnormal working state.

[0072] Preferably, the gas density relay further includes a pressure adjusting mechanism, the pressure adjusting mechanism is a pressure adjustable adjusting mechanism, and the pressure adjusting mechanism is arranged to adjust the pressure rise and fall of the gas density relay body to change the gas density of the gas density relay body. communicating a gas path of the pressure regulating mechanism with a gas path of the gas density relay body; the pressure adjustment mechanism is connected to the smart control unit; The smart control unit outputs a first density value P X20 The contact signal value is collected, and the preset contact signal value is the second density value P B20 and the smart control unit and / or background detects a first density value P X20 and a second density value P B20 and the contact signal difference |P X20 -P B20 Get |Contact signal difference|P X20 -P B20 If | is within the preset threshold, the current working state of the monitoring portion of the gas density relay is a normal working state and no maintenance is required; otherwise, it is an abnormal working state.

[0073] Preferably, the gas density relay body further has a reference pressure value output signal and / or a reference density value output signal; wherein the reference pressure value output signal is obtained by monitoring the gas pressure through the pressure detector of the gas density relay body and outputting through the reference signal of the gas density relay body, and the reference density value output signal is obtained by monitoring the gas density through the pressure detector and the temperature compensation element of the gas density relay body and outputting through the reference signal of the gas density relay body; the mutual verification method further includes: connecting the reference pressure value output signal to the smart control unit; and / or the matched density value output signal is connected to the smart control unit; The comparison pressure value output signal output from the comparison signal is a first pressure value P S The pressure value collected by the first gas density detection sensor at the same time is a second pressure value P J and the smart control unit and / or background detects a first pressure value P S and the second pressure value P J and the pressure difference |P J -P S Get |Pressure difference|P J -P S is within the preset threshold, the current operating condition of the monitoring portion of the gas density relay is normal and does not require maintenance, or is otherwise abnormal; and / or The match density value output signal output by the match signal is a first density value P S20 The gas density value collected by the first gas density detection sensor at the same time is a second density value P J20 and the smart control unit and / or background detects a first density value P S20 and a second density value P J20 and the density difference |P J20 -P S20 Get the density difference |P J20 -P S20 If | is within the preset threshold, the current working state of the monitoring part of the gas density relay is a normal working state and no maintenance is required; otherwise, it is an abnormal working state.

[0074] Preferably, the gas density relay further comprises a camera, and the mutual inspection method comprises: connecting said camera to said smart control unit; The camera uses face image recognition technology to detect the first density value P Z20 The gas density value collected by the first gas density detection sensor at the same time is the second density value P J20and the smart control unit and / or background detects a first density value P Z20 and a second density value P J20 and the density difference |P J20 -P S20 Get the density difference |P J20 -P S20 If | is within the preset threshold, the current working state of the monitoring portion of the gas density relay is a normal working state and no maintenance is required; otherwise, it is an abnormal working state. The cross-validation of the first and second pressure values ​​collected at the same gas pressure; and / or cross-validation of the first and second temperature values ​​collected at the same gas temperature; or cross-validation of the first and second density values ​​collected at the same gas density may be performed by the smart control unit, or the data may be transmitted in the background and the cross-validation may be performed in the background. Effect of the Invention

[0075] Compared with the prior art, the technical solutions of the present disclosure have the following beneficial effects:

[0076] 1) Provide a maintenance-free gas density relay, solve the problem of gas density monitoring for gas-insulated or arc-extinguishing electrical equipment, and complete the online self-verification or mutual verification of the gas density relay, improving efficiency and eliminating the need for maintenance, reducing operation and maintenance costs, and ensuring the safe operation of the power grid.

[0077] 2) To provide a mutual verification method for the maintenance-free gas density relay, which can support the normal operation of the maintenance-free gas density relay.

[0078] The drawings forming a part of this application are intended to provide a further understanding of the application, and the illustrative embodiments and the description thereof are intended to interpret the application and are not intended to unduly limit the application. [Brief description of the drawings]

[0079] [Figure 1] FIG. 2 is a structural schematic diagram of a maintenance-free gas density relay used in high- and medium-voltage electrical equipment according to the first embodiment. [Diagram 2] FIG. 11 is a structural schematic diagram of a maintenance-free gas density relay or gas density monitoring device used in high- and medium-voltage electrical equipment according to a second embodiment. [Diagram 3] FIG. 11 is a structural schematic diagram of a maintenance-free gas density relay or gas density monitoring device used in high- and medium-voltage electrical equipment according to a third embodiment. [Figure 4] FIG. 11 is a structural schematic diagram of a maintenance-free gas density relay or gas density monitoring device used in high- and medium-voltage electrical equipment according to a fourth embodiment. [Diagram 5] FIG. 11 is a structural schematic diagram of a maintenance-free gas density monitoring system according to a fifth embodiment. [Figure 6] FIG. 11 is a structural schematic diagram of a maintenance-free gas density monitoring system according to a fifth embodiment. [Figure 7] FIG. 11 is a structural schematic diagram of a maintenance-free gas density monitoring system according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0080] Example 1 1 is a structural schematic diagram of a maintenance-free gas density relay used in high and medium voltage electrical equipment according to an embodiment of the present disclosure, as shown in FIG. 1, the maintenance-free gas density relay mainly includes a gas density relay body 1, a gas density detection sensor (pressure sensor 2, temperature sensor 3) and a smart control unit 7; in the gas path, the pressure sensor 2 of the gas density detection sensor communicates with the gas density relay body 1. It further includes a mutual self-verification unit that collates data detected by the mutual self-verification unit by the smart control unit 7 to realize maintenance-free, or collates data detected by the smart control unit 7 and the mutual self-verification unit to realize maintenance-free.

[0081] In this embodiment, the mutual self-verification unit is composed of a reference pressure value output signal and a pressure sensor 2. Here, the gas density relay body 1 includes a housing 102, a base, a pressure detector 103, a temperature compensation element 104, an end base 108, a plurality of signal generators 109, a reference signal 1012 and a reference signal adjustment member 1013, the signal generator 109 includes a micro switch or a magnetically assisted electric contact, and the gas density relay body 1 outputs a contact signal by the signal generator 109; the pressure detector 103 includes a Bourdon tube or a bellows; the temperature compensation element 104 adopts a temperature compensation sheet or a gas sealed in the housing. In this embodiment, the reference signal 1012 is a micro switch, and its voltage can be a low power level (1-36v) or a commercial power level (110-220v). The signal generator 109 has a micro switch (or magnetic auxiliary electric contact), and the gas density relay body 1 monitors the gas density through the pressure detector 103 and the temperature compensation element 104, and outputs a gas density contact signal through the signal generator 109. The principle is to use the temperature compensation element 104 to compensate for the changing pressure and temperature based on the pressure detector 103, so as to reflect the change in sulfur hexafluoride gas density. That is, when the density value of sulfur hexafluoride (or other) gas changes due to the action of the pressure of sulfur hexafluoride (SF6) gas, which is the medium to be measured, and the action of the temperature compensation element 104, the pressure value of sulfur hexafluoride (or other) gas also changes accordingly, and the end of the pressure detector 103 inevitably generates a corresponding elastic deformation displacement, which is transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 further transmits it to the pointer 106, and the measured density value of sulfur hexafluoride gas is displayed on the dial. The signal generator 109 is an alarm output latch contact. In this manner, the gas density relay body 1 can display the sulfur hexafluoride gas density value.If gas leakage occurs, the density value of sulfur hexafluoride gas will decrease, and the pressure detector 103 will be displaced downward accordingly, which will transmit it to the movement 105 via the temperature compensation element 104, and the movement 105 will further transmit it to the pointer 106, which will move the pointer 106 in the direction of decreasing the indicated value, and specifically display the degree of gas leakage on the dial; at the same time, the pressure detector 103 will drive the beam to be displaced downward by the temperature compensation element 104, and the adjusting member 107 on the beam will gradually separate from the signal generator 109, and when it reaches a certain degree, the contact of the signal generator 109 will be turned on and send a corresponding contact signal (alarm or latch), which will reach the density of monitoring and controlling sulfur hexafluoride gas in equipment such as electric switches, and allow the electric equipment to work safely. When the gas density value rises, i.e., when the sulfur hexafluoride gas pressure value in the sealed gas chamber becomes greater than the set sulfur hexafluoride gas pressure value, the pressure value also rises accordingly, causing the end of the pressure detector 103 and the temperature compensation element 104 to displace upward accordingly, which in turn displaces the beam upward, causing the adjustment member 107 on the beam to displace upward and press the contact of the signal generator 109 to turn it off, and the contact signal (alarm or latch) is released.

[0082] The reference pressure value output signal is output by the reference signal device 1012 after the gas pressure is monitored by the pressure detector 103. The operation principle is as follows: The pressure value of the (sulfur hexafluoride) gas changes with the environmental temperature, and the pressure value also changes accordingly. When the pressure value changes, a corresponding elastic deformation displacement is inevitably generated at the end of the pressure detector 103, and the gas pressure value is set to a pressure value P S When the pressure reaches the predetermined (or set) reference pressure value P, the pressure detector 103 drives the reference signal adjusting member 1013 via the end base 108 to trigger the reference signal 1012, which then outputs a reference pressure value signal of a set value. The mutual self-verification unit is made up of this reference pressure value output signal and the pressure sensor 2. That is, when the gas pressure monitored by the gas density relay reaches the predetermined (or set) reference pressure value P SWhen the pressure drops or rises to the set value, the reference signal 1012 outputs a reference pressure value output signal of the set value. This signal can be connected to a remote gas density relay or gas density monitoring device (or system), for example, a smart control unit 7, and utilizes the pressure change caused by the change in the environmental temperature, or the pressure change caused by the pressure adjustment mechanism adjusting the pressure when the gas path is closed, and outputs the gas pressure value P at that time collected by the smart control unit 7 of the electrical part of the remote gas density relay or gas density monitoring device (or system). J At that time, the gas pressure value P J When the reference signal 1012 outputs the reference pressure value output signal, the gas pressure value P collected by the electrical part J In simple terms, under the same gas pressure, the reference pressure value P S is the pressure value detected by the pressure detector 103 of the mechanical part of the gas density relay, and P J The value is the gas pressure value detected by the electrical portion of the gas density relay (mainly by the pressure sensor). The remote gas density relay or gas density monitoring device (or system) transmits the detected gas pressure value P J and the reference pressure value P S If the consistency is good, it indicates that the remote gas density relay or gas density monitoring device (or system) is normal to monitor the operation of the pressure monitoring part online, and no maintenance is required. That is, |P J -P S │ is within the allowable set value, it indicates that the remote gas density relay or gas density monitoring device (or system) is normal to monitor the operation of the pressure monitoring part online, the pressure detector 103 of the gas density relay is also normal, and no maintenance is required. The pressure value range corresponding to the reference pressure value output signal is 60% to 130% of the pressure value at 20°C corresponding to the rated value of the gas density relay main body. For example, the pressure value range corresponding to the reference pressure value output signal of a gas density relay main body with a rated pressure of 0.6 MPa is 0.36 to 0.78 MPa, which can be set appropriately according to the weather temperature of the location.

[0083] In addition, when the gas density relay main body is a digital type gas density relay, the smart control unit may be built into the digital type gas density relay main body or may be provided as a separate unit.

[0084] For example, an integrated circuit or chip can be built into the digital gas density relay body, and the function of the smart control unit can be realized by writing a program (i.e., as a smart control unit), or a programmable controller or chip can be adopted, and then a written program can realize the function of the smart control unit (i.e., as a smart control unit), in which case the present application does not further add a smart control unit. Specifically, the maintenance-free digital (or digital) gas density relay or gas density monitor includes a gas density relay body including a relay body density detection sensor, a traffic light, a communication module, and a smart control unit, and a first gas density detection sensor. Wherein, in the gas path, the relay body density detection sensor is in communication with the first gas density detection sensor in the gas path, and is used for collecting pressure value and temperature value, and / or gas density value; the smart control unit is respectively connected to the relay body density detection sensor, a traffic light, a communication module, and the first gas density detection sensor; the smart control unit obtains the gas density value collected by the relay body density detection sensor, or the smart control unit obtains the pressure value and / or temperature value collected by the relay body density detection sensor, and converts it into a gas density value according to the gas pressure-temperature characteristic; the smart control unit uploads one or more of the gas density value, pressure value, and temperature value through the communication module, thereby completing the online monitoring of the gas density relay of the gas density of the monitored electric equipment; when the gas density value is lower and / or higher than the preset threshold value of the set contact, the smart control unit controls the traffic light to output an alarm and / or a latch contact signal, thereby completing the monitoring of the gas density value in the electric equipment; the smart control unit controls the gas pressure value P collected by the relay body density detection sensor at the same gas pressure to be converted into a gas density value according to the gas pressure-temperature characteristic; S and the gas pressure value P collected by the first gas density detection sensor. J For example, a comparison diagnosis is performed with │P J -P S│ is within the allowable set value, the operation of the monitoring part that monitors the pressure online in the digital gas density relay or gas density monitoring device (or system) is normal, the pressure detector of the relay body density detection sensor of the digital gas density relay is also normal, and no maintenance is required, and / or the smart control unit is A and the temperature value T collected by the first gas density detection sensor. B or the smart control unit performs a comparison diagnosis with the gas density value P collected by the relay body density detection sensor at the same gas density. S20 and the gas density value P collected by the first gas density detection sensor. J20 The current operating status of the gas density relay monitoring unit is obtained by comparing with the current status of the gas density relay monitoring unit. J20 -P S20If | is within the allowable set value, it means that the operation of the monitoring part for monitoring density online in the gas density relay or gas density monitoring device (or system) is normal and no maintenance is required. Or, the smart control unit uploads the received data to the background by the communication module, and the background performs a comparison diagnosis between the gas pressure value collected by the relay body density detection sensor and the gas pressure value collected by the first gas density detection sensor at the same gas pressure, and / or the background performs a comparison diagnosis between the temperature value collected by the relay body density detection sensor and the temperature value collected by the first gas density detection sensor at the same gas temperature; or, the background performs a comparison diagnosis between the gas density value collected by the relay body density detection sensor and the gas density value collected by the first gas density detection sensor at the same gas density, and obtains the current operating state of the monitoring part of the gas density relay. Here, the relay body density detection sensor includes a body pressure sensor and a body temperature sensor, or adopts a body gas density transmitter composed of a pressure sensor and a temperature sensor, or adopts a body density detection sensor with quartz tuning fork technology. Furthermore, the first gas density detection sensor may only include at least one pressure sensor, and the temperature sensor may use a body temperature sensor. The matching of the body temperature sensor is performed by matching the environmental temperature value with the temperature value acquired by the body temperature sensor of the relay body density detection sensor through the smart control unit and / or background to complete the verification of the body temperature sensor of the relay body density detection sensor. For the same substation, the temperature values ​​monitored by the temperature sensors of the electrical equipment X, electrical equipment Y, and electrical equipment Z are respectively T X , T Y , T Z and by analogy, the background may be a temperature value T X , T Y , T Z If any of them is obviously deviated, the current operating state of the temperature sensor monitoring the equipment is in an abnormal operating state; if it is almost close, it means that the current operating states of the gas density relay or the monitoring parts of the gas density monitoring device are all in a normal operating state.

[0085] Example 2 FIG. 2 is a front structural schematic diagram of a maintenance-free gas density relay used in a high-voltage electrical equipment according to a second embodiment of the present disclosure. As shown in FIG. 2, unlike the first embodiment, this embodiment outputs a reference density value output signal. When the gas density relay outputs a signal by collating with the density value, the density value of the gas density relay can be changed by utilizing the temperature difference between the density relay and the electrical equipment (or the density relay density value is changed by adjusting the temperature compensation element using the temperature adjustment mechanism, or the density is changed by adjusting the pressure when the gas path is closed by the pressure adjustment mechanism). The smart control unit 7 of the electrical part of the gas density relay collects the gas density value in real time through the pressure sensor 2 and the temperature sensor 3, and the pressure detector 103 and the temperature compensation element 104 of the mechanical part of the gas density relay also monitor the gas density value in real time. When the gas density value obtained by monitoring the gas density falls or rises to a certain value, a reference density value output signal is output. At this time, the smart control unit 7 of the electrical part collects the gas density value P through the pressure sensor 2 and the temperature sensor 3. J20 The gas pressure value monitored by the pressure detector 103 and the temperature compensation element 104 in the mechanical part is P S20 (reference density value). That is, at the same gas density value, the gas pressure value detected by the pressure detector 103 and the temperature compensation element 104 of the mechanical part of the gas density relay is P S20 (reference density value) and the gas density value P collected by the electrical part (mainly the pressure sensor 2 and the temperature sensor 3). J20 If the consistency is good, it means that the gas density relay or the monitoring part that monitors the density online in the gas density monitoring device (or system) is operating normally and no maintenance is required. That is, |P J20 -P S20 If | is within the allowable set value, it means that the operation of the gas density relay or the monitoring part that monitors density online in the gas density monitoring device (or system) is normal and no maintenance is required.

[0086] Example 3 3 is a structural schematic diagram of a maintenance-free gas density relay or gas density monitoring device for use in high-voltage electrical equipment according to a third embodiment of the present disclosure, and as shown in Fig. 3, the maintenance-free gas density relay or gas density monitoring device according to the third embodiment of the present disclosure includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an online verification contact signal sampling unit 6, a smart control unit 7, and a multi-contact 9. One end of the valve 4 is connected to a connection port of an apparatus, and the other end of the valve 4 is connected to the multi-contact 9. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the smart control unit 7 are installed in the multi-contact 9; the pressure sensor 2 is connected to the pressure detector of the gas density relay body 1 in the gas path; the pressure adjustment mechanism 5 is installed in the multi-contact 9, and the pressure adjustment mechanism 5 is connected to the pressure detector of the gas density relay body 1; the online verification contact signal sampling unit 6 and the smart control unit 7 are installed together; the temperature sensor 3 is installed near the gas density relay body 1 or near the temperature compensation element inside its housing. The pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are respectively connected to the smart control unit 7. The pressure adjustment mechanism 5 in this embodiment is mainly composed of a gas chamber 57, a heating element 58, a heat retention member 59, and a temperature sensor (not shown). A heating element 58 is provided outside (or inside) the gas chamber 57 so that the temperature changes by heating, and the pressure rises and falls. The pressure adjusting mechanism 5 adjusts the pressure so that a contact operation occurs in the gas density relay body 1, and the contact operation is transmitted to the smart control unit 7 via the online verification contact signal sampling unit 6. The smart control unit 7 calculates a corresponding density value P based on the pressure value and temperature value at the time of contact operation of the gas density relay body 1. X20 , and detects the alarm and / or latch contact operating value and / or return value of the gas density relay body 1, thereby completing the verification operation of the gas density relay. Instead of the heating element 58, a cooling element may be used.

[0087] The working principle of this embodiment is as follows: when the density relay needs to be verified, the device issues a command to heat the heating element 58 of the pressure regulating mechanism 5, and after the temperature difference between the temperature value of the temperature sensor of the pressure regulating mechanism 5 and the temperature value of the temperature sensor 3 reaches a set value, the device or system issues a command, namely, closes the valve 4 by the smart control unit 7, disconnects the gas density relay body 1 from the connection port of the device in the gas path, and can also be disconnected from the electrical equipment; then, immediately disconnects the heating element 58 of the regulating mechanism 5, stops heating the heating element 58, and the gas pressure in the sealed gas chamber 57 of the pressure regulating mechanism 5 gradually decreases, causing the gas density relay body 1 to generate an alarm and / or latch contact operation, which contact operation is transmitted to the smart control unit 7 by verifying the contact signal sampling unit 6 online, and the smart control unit 7 detects the alarm and / or latch contact operation value and / or return value of the gas density relay body 1 according to the gas density value at the time of the alarm and / or latch contact operation, and completes the verification work of the gas density relay body 1. In this embodiment, the mutual self-verification unit is mainly composed of a pressure adjustment mechanism 5 and a smart control unit 7. By utilizing the change in gas density caused by the pressure adjustment of the pressure adjustment mechanism 5, the smart control unit 7 timely detects the contact signal value P X20 The detected gas density is collected and the contact signal value P X20 The density of the relay is the standard (rated parameters) required contact signal value P B20 If the consistency is good, it means that the gas density relay or the density online monitoring part of the gas density monitor is working normally and no maintenance is required. That is, |P X20 -P B20 If | is within its allowable set value, it means that the gas density relay or the online density monitoring portion of the gas density monitor is operating normally and no maintenance is required.

[0088] In short, after the gas density relay completes the online verification work of the gas density relay body, if there is an abnormality, it can automatically issue an alarm, and can upload it to a remote location, or can send it to a designated receiver, for example, a mobile phone. Or, if there is an abnormality after the gas density relay completes the verification work of the gas density relay body, the smart control unit 7 can upload it to a remote location (such as a monitoring room, a background monitoring platform, etc.) through the alarm contact signal of the gas density relay body 1, and can even display a notice on the spot. In the case of online verification by a simple gas density relay, the verified abnormality result can be uploaded through an alarm signal line. It can be uploaded according to a certain rule, for example, in the case of an abnormality, one contact can be connected in parallel to the alarm signal contact and closed and opened regularly, and the situation can be obtained through analysis, or it can be uploaded through an independent verification signal line. Specifically, it can be uploaded under a good condition, it can be uploaded when there is a problem, it can be density monitoring upload by remote online, the verification result can be uploaded through a separate verification signal line, it can be displayed on the spot, it can be an alarm on the spot, it can be uploaded wirelessly, or it can be uploaded by connecting a smartphone to the Internet. Its communication method is wired or wireless, the wired communication method can be RS232, RS485, industrial bus such as CAN-BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; the wireless communication method can be 2G / 3G / 4G / 5G, etc., WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, acoustic, sensor-built-in 5G / NB-IOT communication module (for example, NB-IOT), etc. In short, various methods and various combinations can be adopted to ensure the reliability of the gas density relay.

[0089] Example 4 4 is a structural schematic diagram of a maintenance-free gas density relay or gas density monitoring device for use in high-voltage electrical equipment according to a fourth embodiment of the present disclosure. As shown in FIG. 4, the maintenance-free gas density relay or gas density monitoring device according to the fourth embodiment of the present disclosure includes a gas density relay body 1, a pressure sensor 21, a pressure sensor 22, a temperature sensor 31, a temperature sensor 32, a valve 4, a pressure regulating mechanism 5, an online verification contact signal sampling unit 6, a smart control unit 7, and an equipment connection port 1010. During operation, one end of the equipment connection port 1010 is sealedly connected to a gas-insulated electrical equipment, and the other end of the equipment connection port 1010 communicates with the valve 4; the other end of the valve 4 communicates with the pressure regulating mechanism 5. The gas density relay body 1, the temperature sensor 31, the online verification contact signal sampling unit 6, and the smart control unit 7 are installed together and installed in the pressure regulating mechanism 5; the pressure sensor 21 is installed in the pressure regulating mechanism 5. The pressure sensor 22 and the temperature sensor 32 are provided on the device connection port 1010 side (the side where the valve 4 is connected to the connection port 1010). The pressure sensor 21 and the pressure detector of the gas density relay main body 1 communicate with the pressure adjustment mechanism 5 in the gas path; the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, and the temperature sensor 32 are connected to the smart control unit 7; the valve 4 is connected to the smart control unit 7, and the pressure adjustment mechanism 5 is connected to the smart control unit 7. In this embodiment, there are two pressure sensors, which are the pressure sensor 21 and the pressure sensor 22, and there are two temperature sensors, which are the temperature sensor 31 and the temperature sensor 32. In this case, the temperature sensor 32 may be omitted. The maintenance-free gas density relay or gas density monitoring device according to the fourth embodiment of the present disclosure has a plurality of pressure sensors and temperature sensors. For example, in this embodiment, the mutual self-verification means is composed of two gas density detection sensors A and B. Specifically, the pressure values ​​P A and P B , temperature value T A and T BIf the consistency is good, it means that the gas density relay or the online monitoring part of the gas density monitor is operating normally and no maintenance is required. That is, |P A -P B │and│T A -T B If | is within the respective allowable set values, it means that the operation of the gas density relay or the online monitoring portion of the gas density monitor is normal and no maintenance is required.

[0090] The purpose of this is to make it possible to cross-reference and verify the pressure values ​​monitored by the pressure sensors 21 and 22; to make it possible to cross-reference and verify the pressure values ​​monitored by the temperature sensors 31 and 32; and to make it possible to cross-reference and verify the density values ​​P A20 , the density value P monitored by the pressure sensor 22 and the temperature sensor 32 B20 That is, the mutual self-verification unit is composed of a plurality of (at least two) gas density detection sensors A and B, and the density values ​​P detected by the gas density detection sensors A and B, respectively, can be checked and mutually verified based on the above. A20 and P B20 If the consistency is good, it means that the gas density relay or the online monitoring part of the gas density monitor is working normally and no maintenance is required. That is, |P A20 -P B20 If | is within its allowable set value, it means that the gas density relay or the online monitoring portion of the density monitor is operating normally and no maintenance is required.

[0091] Furthermore, the density value Pe20 as the rated value of the gas density relay body can be obtained by online verification, and can be cross-verified. If the data between the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32, and the gas density relay body 1 match and are normal, it can mean that the gas density relay or the gas density monitoring device is normal. In this way, there is no need for manpower to go to the site to verify the gas density relay, and manpower-free verification of the entire useful life can be realized. Except when the data between the pressure sensor 21, the pressure sensor 22, the temperature sensor 31, the temperature sensor 32, and the gas density relay itself of any of the electrical equipment in the substation do not match and are abnormal, no maintenance personnel are arranged to deal with the problem. In addition, for those that match and are normal, verification is not required, which significantly increases reliability, improves efficiency, and reduces costs.

[0092] In the fourth embodiment of the present disclosure, a maintenance-free gas density relay or gas density monitoring device used in gas-insulated high-voltage electrical equipment has a safety protection function, and specifically, 1) if the density value obtained by monitoring by either the pressure sensor 21 or the temperature sensor 31, or by either the pressure sensor 22 or the temperature sensor 32, falls below a set value, the gas density relay automatically does not verify the gas density relay main body 1 and issues a notice signal. For example, if the gas density value of the device is smaller than the set value, verification is not performed. Verification is possible only when the gas density value of the device is ≧(latch pressure+0.02MPa). The contact alarm has a status indication. 2) Or, if the density value monitored by the pressure sensor 22 and the temperature sensor 32 falls below the set value when the valve 4 is closed at this time during verification, the gas density relay automatically does not verify the gas density relay main body 1 and issues a notice signal (gas leakage). For example, if the gas density value of the device is smaller than the set value (latch pressure+0.02MPa), verification is not performed. The set value can be set as necessary. In addition, the gas density relay further has a plurality of pressure sensors, a temperature sensor for mutual verification, and a pressure sensor, a temperature sensor and a gas density relay body 1 for mutual verification to ensure that the gas density relay operates normally.

[0091] The gas density relay can compare its error performance at different temperatures and different time periods. That is, the performance of the electrical equipment and the gas density relay is judged by comparing at different times and in the same temperature range. The gas density relay has a comparison of each time period in the history and a comparison between the history and the present. In addition, the gas density relay body can be inspected for health. The gas density relay can be repeatedly inspected multiple times (for example, 2 to 3 times), and the average value is calculated based on the results of each inspection. If necessary, online inspection of the density relay can be performed at any time.

[0093] In the above, the type of pressure sensor includes absolute pressure sensor, relative pressure sensor, or absolute pressure sensor and relative pressure sensor, and the number may be more than one. The pressure sensor may be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (e.g., a Bardon tube pressure measurement sensor with an induction coil), a resistive pressure sensor (e.g., a Bardon tube pressure measurement sensor with a sliding line resistor), or may be an analog or digital measurement pressure sensor. Pressure collection is various pressure-sensitive elements such as pressure sensors and pressure transducers, for example, diffused silicon type, sapphire type, piezoelectric type, strain chip type (resistive strain chip type, ceramic strain chip type). The temperature sensor may be a thermocouple, a thermistor, a semiconductor type, may be a contact type and a non-contact type, and may be a thermal resistance and a thermocouple. In short, various temperature-sensitive elements such as a temperature sensor and a temperature transmitter may be used for temperature collection. The gas density relay body includes density relays with indication (density relays with pointer indication, density relays with digital indication, density relays with liquid crystal display) and density relays without indication (i.e., density switches). The gas density relay has pressure, temperature measurement and software conversion functions. Under the premise of not affecting the safe operation of the electrical equipment, the alarm and / or latch contact operating value and / or return value of the gas density relay can be detected online. Of course, the return value of the alarm and / or latch contact signal can be used without testing if necessary.

[0094] The smart control unit 7 mainly completes the control of the valve, the control of the pressure regulating mechanism, and the signal collection. That is, the basic requirements or functions of the smart control unit 7 are the control of the valve 4, the control of the pressure regulating mechanism 5, and the signal collection by the smart control unit 7. The pressure value and the temperature value when the contact signal of the gas density relay body is operated can be detected, and converted into the corresponding pressure value P20 (density value) at 20°C. That is, the contact operation value PD20 of the gas density relay body can be detected, and the verification operation of the gas density relay body can be completed. Alternatively, the most basic requirement is to directly detect the density value PD20 when the contact signal of the gas density relay body is operated, and complete the verification work of the gas density relay body. Of course, the smart control unit 7 can also realize the storage of test data, and / or the derivation of test data, and / or the printing out of test data, and / or the data communication with the upper machine, and / or the input of analog and digital information. The smart control unit 7 further includes a communication module, and realizes information such as remote transmission test data and / or verification results through the communication module; when the rated pressure value of the gas density relay main body 1 outputs a signal, the smart control unit 7 simultaneously collects the density value at that time, and completes the verification of the rated pressure value of the gas density relay main body. The gas density relay automatically performs a comparison judgment, and if the degree of error is large, it will give an abnormality indication that there is a problem with the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. That is, the gas density relay can perform a mutual verification function of the pressure detector and the pressure sensor, temperature sensor, or density transmitter, etc. of the gas density relay itself; it can perform mutual verification of the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. When the verification of the gas density relay is completed, the gas density relay automatically performs a mutual verification judgment, and if the degree of error is large, it will give an abnormality indication that there is a problem with the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself. That is, the gas density relay can perform a mutual verification function of the pressure detector, pressure sensor, temperature sensor, or density transmitter, etc. of the gas density relay itself.The gas density relay has the ability of artificial intelligence calibration;After completing the verification work of the gas density relay, it can automatically generate a verification report of the density relay, and if there is an abnormality, it can automatically send an alarm or send it to a designated receiver, such as a mobile phone;It can display the density value and verification result on the spot, or display the density value and verification result in the background, and the specific manner is flexible;It has the functions of real-time online density value, pressure value, temperature value and other data display, change trend analysis, historical data search, real-time warning, etc.;It can monitor the gas density value, or density value, pressure value, and temperature value online;It has the self-diagnosis function, and can timely notify abnormalities such as disconnection, short circuit alarm, sensor damage, etc.;It can judge the performance of the gas density relay by comparing the error performance of the gas density relay at different temperatures and different time periods, that is, by comparing different periods and the same temperature range. It has the comparison of each time period of the history, and the comparison between the history and the present. In addition, it can perform the health diagnosis of the gas density relay itself;The gas density relay itself judges whether the density value of the monitored electrical equipment is normal or not. That is, the density value of the electrical equipment itself, the pressure detector, pressure sensor, temperature sensor, etc. of the gas density relay itself can be judged, analyzed, and compared as to whether they are normal or abnormal, and the gas density monitoring of the electrical equipment, the gas density relay itself, etc. can be judged, compared, and analyzed; An analysis system (professional management analysis system) is further included for detecting and analyzing the gas density monitoring, gas density relay, and monitoring elements to determine where the problem is, and whether there is a problem with the electrical equipment or the gas density relay itself; The contact signal status of the gas density relay body can be monitored and the status can be remotely transmitted. In the background, it can be known whether the contact signal status of the gas density relay body is off or on, and further monitored to improve reliability; The temperature compensation performance of the gas density relay body can be detected or detected and judged; The contact resistance of the gas density relay body can be detected or detected and judged; It has data analysis and data processing functions, and can perform corresponding fault diagnosis and prediction for the electrical equipment.

[0095] If the detection data between the pressure sensor 2, temperature sensor 3, pressure detector 103, temperature compensation element 104, etc. match and are normal, the gas density relay itself is normal, and there is no need for a maintenance person to go to the site to verify the gas density relay using the conventional method, which means that verification can be performed without manpower over the service life. Except when the detection data between the pressure sensor 2, temperature sensor 3, pressure detector 103, temperature compensation element 104, etc. of any of the electrical equipment of the substation do not match and are abnormal, no maintenance person is dispatched to deal with the problem. For those that match and are normal, there is no need to perform manual verification, which significantly increases reliability, improves efficiency, and reduces costs.

[0096] Example 5 5 to 7 show a maintenance-free gas density monitoring system including the above-mentioned maintenance-free gas density relay or gas density monitoring device.

[0096] As shown in FIG. 5, a plurality of electrical equipments provided with gas chambers, a plurality of maintenance-free gas density relays or gas density monitors are all sequentially connected to the remote background detection system by a hub and an IEC61850 protocol converter; where, the maintenance-free gas density relays or gas density monitors are respectively installed in the electrical equipments of the corresponding gas chambers.

[0097] As shown in Figure 5 and Figure 6, PC is the background host and system to be monitored online, Gateway is the network switch, Server is the integrated application server, ProC is the contract converter / online monitoring smart unit, HUB is the hub, and Z is the maintenance-free gas density relay or gas density monitoring device. The online monitoring system architecture includes system diagrams such as detailed / simple architecture (Figure 5), normal architecture (Figure 6), and complex architecture.

[0098] System architecture diagram and brief description: 1) Background software platform: Windows, Linux and others, or based on VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2) Key business modules and basic functions of background software: such as authority management, equipment management, data storage query, etc.; and user management, alarm management, real-time data, historical data, real-time curve, historical curve, configuration management, data collection, data analysis, recording conditions, abnormality processing, etc. 3) Interface constellation: such as Form interface, Web interface, constellation interface, etc.

[0099] FIG. 7 is an architecture system diagram of the wireless transmission method. The dashed frame in the figure indicates that the wireless module Wn and the gas density relay Zn can be integrated or separated, and the specific solution is flexible. Multiple integrated application servers Server1, Server2, ...Servern wirelessly communicate with each gas density relay through the cloud terminal Cloud, the wireless gateway (WirelessGateway), and the wireless module of each gas density relay. Here, n is a natural number.

[0100] The functions that the maintenance-free gas density relay or gas density monitoring device can achieve are as follows: 1), online monitoring of gas density, or online monitoring of gas density, fine water, or online monitoring of gas density, fine water, and decomposition product content can be realized; 2), online verification of the density relay itself (contact signal value and display value of the density relay can be verified online); 3), mutual verification of electronic detection (monitoring) and mechanical detection (monitoring) can be performed, reliable performance of the system can be realized, and even verification of the service life can be performed without human intervention. Unless the detection data between the pressure sensor 2, temperature sensor 3, and gas density relay body 1 of any electrical equipment of the substation does not match and is abnormal, no maintenance personnel will be arranged to deal with it. For those that match and are normal, there is no need to perform verification, which greatly increases reliability, improves efficiency, and reduces costs; 4) Even zero-bit verification of the pressure sensor 2 can be performed.

[0101] The maintenance-free gas density relay or gas density monitor has a self-diagnosis function, and can perform self-diagnosis for each element and diagnose the process, for example, monitoring or verifying the process; the gas density relay has the ability of self-verification and verification.

[0102] The maintenance-free gas density relay or gas density monitoring device includes multiple pressure sensors, a temperature sensor, mutual verification of test data of multiple pressure sensors, temperature sensors, and mutual verification of test data of these sensors and the gas density relay body to ensure the normal operation of the gas density relay.

[0103] The maintenance-free gas density relay or gas density monitor compares the transmitted environmental temperature value with the sampling value of the temperature sensor to complete the verification of the temperature sensor.

[0104] It should be noted that the maintenance-free gas density relay described in this application generally means that its components are designed in an integrated structure, while the gas density monitor generally means that its components are designed in a separate structure and flexibly configured. The gas temperature broadly refers to the temperature in the gas or the corresponding environmental temperature. The matching verification method in this disclosure includes, but is not limited to, any one of the following: the corresponding difference is within its preset threshold, the detection value is within its set range, and the division value of two corresponding detection values ​​is within its preset threshold. In the mutual verification method, the matching of the corresponding detection results is completed by the smart control unit and / or the background, and the manner is flexible. Although the specific embodiments of the present disclosure have been described in detail above, they are merely examples, and the present disclosure is not limited thereto. For those skilled in the art, any equivalent modifications and replacements made to the present disclosure are within the scope of the present disclosure. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present disclosure are intended to be within the scope of the present disclosure. [Explanation of symbols]

[0105] 1 Gas Density Relay Body 2. Pressure Sensor 3 Temperature Sensor 4 Valve 5. Pressure adjustment mechanism 7 Smart Control Unit 21, 22 Pressure sensor 31, 32 Temperature sensor 102 Housing 103 Pressure detector 104 Temperature compensation element 105 Movement 106 Guidelines 107 Adjustment member 108 End Base 109 Signal Generator 1010 Connection port 1012 Matching signal 1013 Reference signal adjustment member

Claims

1. A maintenance-free gas density relay including a gas density relay body, a first gas density detection sensor, and a smart control unit, The first gas density detection sensor is in gas path communication with the gas density relay body and is used to collect pressure and temperature values ​​and / or gas density values, and the smart control unit is connected to the gas density relay body and / or the first gas density detection sensor, and receives and / or calculates monitoring data of the gas density relay body and the first gas density detection sensor; the smart control unit verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the smart control unit verifies a first temperature value and a second temperature value collected at the same gas temperature, or the smart control unit verifies a first density value and a second density value collected at the same gas density to obtain a current operating state of the monitoring portion of the gas density relay; or the smart control unit uploads the received data to a background, and the background verifies the first and second pressure values ​​collected at the same gas pressure, and / or the background verifies the first and second temperature values ​​collected at the same gas temperature, or the background verifies the first and second density values ​​collected at the same gas density, and obtains a current operating status of the monitoring portion of the gas density relay; one or both of the first pressure value and the second pressure value are from the first gas density detection sensor or the gas density relay body, one or both of the first temperature value and the second temperature value are from the first gas density detection sensor or the gas density relay body, and one or both of the first density value and the second density value are from the first gas density detection sensor or the gas density relay body; A maintenance-free gas density relay.

2. The gas density relay includes at least two first gas density detection sensors, each of which includes a pressure sensor and a temperature sensor, and the pressure value and the temperature value or the gas density value detected by each of the first gas density detection sensors are collated to complete mutual verification of each of the first gas density detection sensors; 2. A maintenance-free gas density relay according to claim 1.

3. The gas density relay further includes a second gas density detection sensor, and the first gas density detection sensor and the second gas density detection sensor each include a pressure sensor and a temperature sensor, and the pressure value and the temperature value or the gas density value of the first gas density detection sensor are compared with the pressure value and the temperature value or the gas density value of the second gas density detection sensor to complete mutual verification of the first gas density detection sensor and the second gas density detection sensor; 2. A maintenance-free gas density relay according to claim 1.

4. The first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, or the first gas density detection sensor is a gas density transmitter consisting of a pressure sensor and a temperature sensor, or the first gas density detection sensor is a density detection sensor using quartz tuning fork technology.

2. A maintenance-free gas density relay according to claim 1.

5. The smart control unit and / or background compares the environmental temperature value with the temperature value collected by each temperature sensor of the first gas density detection sensor to complete the verification of each temperature sensor; 5. A maintenance-free gas density relay according to claim 4.

6. The first gas density detection sensor includes at least two pressure sensors, and the pressure values ​​collected by each pressure sensor are collated to complete mutual verification of each pressure sensor.

5. A maintenance-free gas density relay according to claim 4.

7. The first gas density detection sensor includes at least two temperature sensors, and the temperature values ​​collected by each temperature sensor are collated to complete mutual verification of each temperature sensor.

5. A maintenance-free gas density relay according to claim 4.

8. The gas density relay further includes a temperature adjusting mechanism, the temperature adjusting mechanism being a temperature adjustable adjusting mechanism, and the temperature adjusting mechanism is arranged to adjust and raise and lower the temperature of the temperature compensation element of the gas density relay body to change the gas density of the gas density relay body, and the smart control unit is configured to adjust and lower the temperature of the temperature compensation element of the gas density relay body to change the gas density of the gas density relay body, and the smart control unit is configured to adjust and lower the temperature of the temperature compensation element of the gas density relay body to change the gas density of the gas density relay body, and Ｘ２０ The contact signal value is collected, and the preset contact signal value is the second density value P Ｂ２０ and the smart control unit and / or background is a first density value P Ｘ２０ and a second density value P Ｂ２０ and the contact signal difference |P Ｘ２０ -P Ｂ２０ | is obtained, and the contact signal difference |P Ｘ２０ -P Ｂ２０ If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is a normal operating state; otherwise, it is an abnormal operating state.

2. A maintenance-free gas density relay according to claim 1.

9. The gas density relay further includes a pressure adjusting mechanism, the pressure adjusting mechanism being a pressure adjustable adjusting mechanism, and the pressure adjusting mechanism is arranged to adjust and raise and lower the pressure of the gas density relay body to change the gas density of the gas density relay body, and the smart control unit is configured to adjust and lower the first density value P Ｘ２０ The contact signal value is collected, and the preset contact signal value is the second density value P Ｂ２０ and the smart control unit and / or background is a first density value P Ｘ２０ and a second density value P Ｂ２０ and the contact signal difference |P Ｘ２０ -P Ｂ２０ | is obtained, and the contact signal difference |P Ｘ２０ -P Ｂ２０ If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is a normal operating state; otherwise, it is an abnormal operating state.

2. A maintenance-free gas density relay according to claim 1.

10. The gas density relay body includes a housing, a base, a pressure detector, a temperature compensation element, a reference signal, and at least one signal generator, the gas density relay body monitors the gas density by the pressure detector and the temperature compensation element, and outputs a contact signal value by the signal generator; The gas density relay body further has a reference pressure value output signal, and the gas pressure of the gas density relay body monitored by the pressure detector rises or falls to a set gas pressure value, and the reference signal outputs a reference pressure value output signal, which is connected to the smart control unit; and / or The gas density relay body further has a reference density value output signal, the gas density of the gas density relay body monitored by the pressure detector and the temperature compensation element rises or falls to a set gas density value, the reference signal outputs a reference density value output signal, and the reference density value output signal is connected to the smart control unit, the verification signal includes one of a microswitch, an electrical contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, an electronic switch, a variable resistor, and a voltage or current measuring device; the signal generator includes one of a microswitch, an electrical contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, and an electronic switch; and the pressure detector includes one of a Bourdon tube, a bellows, a bellows + spring, and a pressure sensor.

2. A maintenance-free gas density relay according to claim 1.

11. The smart control unit obtains the gas density value collected by the first gas density detection sensor when the gas density relay body operates or switches, and completes online verification of the gas density relay; or The smart control unit obtains the pressure value and temperature value collected by the first gas density detection sensor when the gas density relay body operates or switches, and converts the pressure value corresponding to 20°C, i.e., gas density value, according to the gas pressure-temperature characteristics, to complete the online verification of the gas density relay.

2. A maintenance-free gas density relay according to claim 1.

12. A first gas density detection sensor is in communication with the gas density relay body in a gas path; Connecting a smart control unit to the gas density relay body and / or the first gas density detection sensor; The smart control unit verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the smart control unit verifies a first temperature value and a second temperature value collected at the same gas temperature, or the smart control unit verifies a first density value and a second density value collected at the same gas density, and obtains a current operating status of the monitoring portion of the gas density relay, or the smart control unit uploads the received data to a background, and the background verifies a first pressure value and a second pressure value collected at the same gas pressure, and / or the background verifies a first temperature value and a second temperature value collected at the same gas temperature, or the background verifies a first density value and a second density value collected at the same gas density, and obtains a current operating state of a monitoring portion of the gas density relay, one or both of a first pressure value and a second pressure value are from the first gas density detection sensor or the gas density relay body, one or both of a first temperature value and a second temperature value are from the first gas density detection sensor or the gas density relay body, and one or both of a first density value and a second density value are from the first gas density detection sensor or the gas density relay body; 2. The method for cross-validating a maintenance-free gas density relay according to claim 1.

13. 13. The method for mutual verification of a maintenance-free gas density relay according to claim 12, wherein the gas density relay further includes a second gas density detection sensor, and each of the first gas density detection sensor and the second gas density detection sensor includes a pressure sensor and a temperature sensor, The pressure value collected by either the first gas density detection sensor or the second gas density detection sensor is referred to as a first pressure value P Ａ and the temperature value collected by the temperature sensor is the first temperature value T Ａ The pressure value collected by the other of the first gas density detection sensor and the second gas density detection sensor is a second pressure value P Ｂ and the temperature value collected by the temperature sensor is a second temperature value T Ｂ and the smart control unit or background detects the first pressure value P Ａ and the second pressure value P Ｂ and the pressure difference |P Ａ -P Ｂ |, and obtain the first temperature value T Ａ and a second temperature value T Ｂ and the temperature difference |T Ａ -T Ｂ | is obtained, and the pressure difference |P Ａ -P Ｂ | and / or temperature difference |T Ａ -T Ｂ | is within a preset threshold, the current operating state of the monitoring portion of the gas density relay is normal; otherwise, it is abnormal; or The gas density value collected by either the first gas density detection sensor or the second gas density detection sensor is a first density value P Ａ２０ and the other collected gas density value is a second density value P Ｂ２０ the smart control unit and / or background is a first density value P Ａ２０ and a second density value P Ｂ２０ The density difference P Ａ２０ -P Ｂ２０ Obtain the density difference P Ａ２０ -P Ｂ２０ If the threshold value is within the preset threshold value, the current operating state of the monitoring portion of the gas density relay is a normal operating state; otherwise, the current operating state of the monitoring portion of the gas density relay is an abnormal operating state. The method for mutual verification of a maintenance-free gas density relay according to claim 12.

14. 13. The method for cross-validating a maintenance-free gas density relay according to claim 12, wherein the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, The temperature value collected by any of the temperature sensors is a first temperature value T Ａ and the environmental temperature value is the second temperature value T Ｂ and the smart control unit and / or background detects a first temperature value T Ａ and a second temperature value T Ｂ and the temperature difference |T Ａ -T Ｂ |obtain, temperature difference|T Ａ -T Ｂ If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is a normal operating state and does not need maintenance; otherwise, it is an abnormal operating state; or The pressure value collected by any one of the pressure sensors is a first pressure value P Ａ and the pressure value collected by the other pressure sensor is a second pressure value P Ｂ and the smart control unit and / or background detects the first pressure value P Ａ and the second pressure value P Ｂ and the pressure difference |P Ａ -P Ｂ | is obtained, and the pressure difference |P Ａ -P Ｂ If | is within the preset threshold, the current operating state of the monitoring portion of the gas density relay is a normal operating state and does not need maintenance; otherwise, it is an abnormal operating state; or The temperature value collected by any of the temperature sensors is a first temperature value T Ａ and the temperature value collected by the other temperature sensor is a second temperature value T Ｂ and the smart control unit and / or background detects a first temperature value T Ａ and a second temperature value T Ｂ and the temperature difference |T Ａ -T Ｂ | is obtained, and the temperature difference |T Ａ -T Ｂ If | is within the preset threshold, the current operating state of the monitoring part of the gas density relay is normal and does not need maintenance; otherwise, it is abnormal. The method for mutual verification of a maintenance-free gas density relay according to claim 12.

15. 13. The method for cross-validating a maintenance-free gas density relay according to claim 12, wherein the first gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, Randomly arranging and combining the pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor, and converting each combination into a pressure value corresponding to a plurality of 20°C, i.e., a gas density value, according to the gas pressure-temperature characteristics, and comparing each gas density value to complete mutual verification for each pressure sensor and each temperature sensor; or The pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor are subjected to all combinations, and each combination is converted into a pressure value corresponding to a plurality of 20°C, i.e., a gas density value, according to the gas pressure-temperature characteristics, and each gas density value is compared to complete a mutual verification for each pressure sensor and each temperature sensor; or The gas density values, pressure values, and temperature values ​​obtained from each pressure sensor and each temperature sensor are collated to complete mutual verification of the gas density relay body, each pressure sensor, and each temperature sensor; The method for mutual verification of a maintenance-free gas density relay according to claim 12.

16. 13. The method for mutual verification of a maintenance-free gas density relay according to claim 12, wherein the gas density relay further includes a temperature adjustment mechanism, the temperature adjustment mechanism being a temperature adjustable adjustment mechanism, and the temperature adjustment mechanism is arranged to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body to change the gas density of the gas density relay body, The temperature adjustment mechanism is installed inside or outside the housing of the gas density relay body; the temperature control mechanism is connected to the smart control unit; The smart control unit collects contact signal values ​​output during contact operation of the gas density relay body, and obtains a first density value P Ｘ２０ and the preset contact signal value is the second density value P Ｂ２０ and the smart control unit and / or background is a first density value P Ｘ２０ and a second density value P Ｂ２０ and the contact signal difference |P Ｘ２０ -P Ｂ２０ | is obtained, and the contact signal difference |P Ｘ２０ -P Ｂ２０ If | is within the preset threshold, the current operating state of the monitoring part of the gas density relay is normal and no maintenance is required; otherwise, it is abnormal. The method for mutual verification of a maintenance-free gas density relay according to claim 12.

17. 13. The method for mutual verification of a maintenance-free gas density relay according to claim 12, wherein the gas density relay further includes a pressure adjustment mechanism, the pressure adjustment mechanism being a pressure adjustable adjustment mechanism, and the pressure adjustment mechanism is arranged to adjust the pressure rise and fall of a gas density relay body, thereby changing the gas density of the gas density relay body, A gas path of the pressure adjustment mechanism is connected to a gas path of the gas density relay body; the pressure regulation mechanism is connected to the smart control unit; The smart control unit collects contact signal values ​​output during contact operation of the gas density relay body, and obtains a first density value P Ｘ２０ and the preset contact signal value is the second density value P Ｂ２０ and the smart control unit and / or background is a first density value P Ｘ２０ and a second density value P Ｂ２０ and the contact signal difference |P Ｘ２０ -P Ｂ２０ | is obtained, and the contact signal difference |P Ｘ２０ -P Ｂ２０ If | is within the preset threshold, the current operating state of the monitoring part of the gas density relay is normal and does not need maintenance; otherwise, it is abnormal. The method for mutual verification of a maintenance-free gas density relay according to claim 12.

18. 13. The method for mutual verification of a maintenance-free gas density relay according to claim 12, wherein the gas density relay body further collates a pressure value output signal and / or a density value output signal, the collated pressure value output signal is obtained by monitoring the gas pressure through a pressure detector of the gas density relay body and outputting the collated pressure value output signal through a collated signal of the gas density relay body, and the collated density value output signal is obtained by monitoring the gas density through a pressure detector and a temperature compensation element of the gas density relay body and outputting the collated density value output signal through a collated signal of the gas density relay body, connecting the reference pressure value output signal to the smart control unit; and / or the matched density value output signal is connected to the smart control unit; The comparison pressure value output signal output from the comparison signal is a first pressure value P Ｓ The pressure value collected by the first gas density detection sensor at the same time is a second pressure value P Ｊ and the smart control unit and / or background detects the first pressure value P Ｓ and the second pressure value P Ｊ The pressure difference duty P Ｊ -P Ｓ Obtain the duty; pressure difference measurement P Ｊ -P Ｓ is within the preset threshold, the current operating condition of the monitoring portion of the gas density relay is a normal operating condition and does not require maintenance, or is otherwise an abnormal operating condition; and / or The collation density value output signal outputted by the collation signal is a first density value P Ｓ２０ The gas density value collected by the first gas density detection sensor at the same time is a second density value P Ｊ２０ and the smart control unit and / or background is a first density value P Ｓ２０ and a second density value P Ｊ２０ By comparing the density difference acceptance P Ｊ２０ -P Ｓ２０ Get the structure; Density difference portable P Ｊ２０ -P Ｓ２０ If the threshold value is within the preset threshold value, the current working state of the monitoring part of the gas density relay is normal and does not need maintenance; otherwise, it is abnormal. The method for mutual verification of a maintenance-free gas density relay according to claim 12.

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