Method for modifying gas density relay, gas density relay with online self-verification function and verification method thereof

Abstract

This application provides an improved method for a gas density relay used in high-voltage and medium-voltage electrical equipment, a gas density relay with online self-verification function, and a verification method thereof. The gas density relay includes a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a valve, an online verification contact signal sampling unit, and a smart control unit. The pressure regulating mechanism adjusts the pressure increase or decrease, causing the gas density relay body to operate. The contact operation is transmitted to the smart control unit by the online contact signal sampling unit. The smart control unit detects the operation value / return value of the alarm / latch contact signal of the gas density relay body according to the density value at the time of contact operation. This enables the gas density relay verification work to be completed without the need for maintenance personnel to visit the site, has a remote transmission function, and can be maintenance-free, greatly improving the reliability of the power grid, improving work efficiency, and reducing operation and maintenance costs.

Description

[Technical field]

[0001] This application claims priority from the following patent applications: 1. Application No. 201910830193.6 filed on September 4, 2019 (Name of invention: Gas density relay with online self-verification function and verification method thereof); 2. Application No. 201910830188.5 filed on September 4, 2019 (Name of invention: Remote transmission gas density relay system and verification method thereof); 3. Application No. 201910830232.2 filed on September 4, 2019 (Name of invention: Method for modifying gas density relay).

[0002] Technical Field The present disclosure relates to the field of electric power technology, in particular to a gas density relay that is applied to high-voltage and medium-voltage electrical equipment and has an online self-verification function, a verification method thereof, and a method for modifying the gas density relay. [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 installation.

[0004] With the ever-increasing demand for networking and digitalization of unmanned substations and 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 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 grids. High-voltage electrical equipment is currently mostly SF6 gas-insulated equipment, and if the gas density decreases (for example due to leakage), 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 thus realizes online monitoring of gas density. 2) A gas density transmitter is applied to realize the collection and uploading of density, pressure and temperature, and thus realizes online monitoring of gas density. SF6 gas density relay is a key element and an important component, but due to the poor operating environment at the site of high-voltage substations, especially the strong electromagnetic interference, in the currently used gas density monitoring system (gas density relay), its remote SF6 gas density relay is composed of a mechanical density relay and an electronic remote part; in addition, in the power grid system using gas density transmitters, the traditional mechanical density relay is still left. The mechanical density relay has one, two or three sets of mechanical contacts, and when the pressure is in an alarm state, latch state or overpressure state, it transmits information to the target device terminal through the contact connection circuit in a timely manner to ensure the safe operation of the device. At the same time, the monitoring system is further equipped with a safe and reliable circuit transmission function, and establishes an effective platform for realizing real-time data remote data reading and information monitoring and control, and can transmit information such as pressure, temperature, density, etc. to the target device (such as a computer terminal) in a timely manner to realize online monitoring.

[0005] Regular 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 regular inspection of gas density relays. From the actual operation situation, regular inspection of gas density relays is one of the necessary measures to ensure the safety and reliable operation of power equipment. Therefore, the current gas density relay inspection is very important and widespread in the power system, and is carried out by various power companies, power plants, large factories and mining enterprises. Power companies, power plants, large factories and mining enterprises need to arrange testers, equipment vehicles and valuable SF6 gas to complete the on-site inspection measurement work of gas density relays. Roughly calculated, including business losses due to power outages during measurement, the annual allocated measurement cost for each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the on-site inspection by the tester is not performed in accordance with the standard, there are also safety concerns. To this end, an innovation is made in the conventional gas density self-verifying gas density relay, particularly in the gas density online self-verifying gas density relay or system, so that a gas density relay that realizes online gas density monitoring or a monitoring system configured therewith is equipped with a gas density relay verification function, and further, periodic verification work of the (mechanical) gas density relay is completed without the need for maintenance personnel to visit the site, thereby improving work efficiency and reducing costs. Summary of the Invention [Problem to be solved by the invention]

[0006] The objective of the present disclosure is to provide a gas density relay modification method, a gas density relay with online self-verification function and a verification method thereof, in order to solve the problems mentioned in the above technical background. [Means for solving the problem]

[0007] To achieve the above objectives, the present disclosure employs the following technical solutions: A first aspect of the present application is a gas density relay with online self-verification capability, comprising: A gas density relay body; a gas density detection sensor communicating with the gas density relay body; a pressure adjusting mechanism arranged to adjust the rise and fall of the pressure in the gas density relay body and generate a contact signal operation in the gas density relay body; a valve having an interface at one end communicating with an electrical device and the other end communicating with the gas density relay body or connected to a gas path of the pressure adjustment mechanism, thereby communicating with the gas density relay body; an online verification contact signal sampling unit connected to the gas density relay body, configured to sample a contact signal of the gas density relay body at an ambient temperature; a smart control unit respectively connected to the gas density detection sensor, the pressure regulating mechanism, the valve and the online verification contact signal sampling unit, and configured to control the pressure regulating mechanism, collect pressure values ​​and temperature values, and / or collect gas density values, and control the latching or opening of the valve to detect the contact signal operating value and / or contact signal return value of the gas density relay body; Including, The contact signal includes an alarm and / or a latch. 1. A gas density relay having an online self-verification capability comprising:

[0008] Preferably, the gas density relay body includes one or more of a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal and gas compensated mixed gas density relay, a fully mechanical gas density relay, a digital gas density relay, a combined mechanical and digital gas density relay, a gas density relay with pointer, a digital display gas density relay, a gas density switch with or without display, an SF6 gas density relay, an SF6 mixed gas density relay, and an N2 gas density relay.

[0009] Preferably, the gas density relay body includes a housing, a base provided within the housing, a pressure detector, a temperature compensation element, and a plurality of signal generators, the signal generator including a microswitch or a magnetically assisted electrical contact, the gas density relay body outputs a contact signal via the signal generator, the pressure detector includes a Bourdon tube or a corrugated tube, and the temperature compensation element uses a temperature compensation sheet or a gas sealed in the housing.

[0010] More preferably, the gas path of the pressure regulating mechanism communicates with the pressure detector.

[0011] More preferably, the gas path of the pressure adjustment mechanism is connected to the pressure detector, and the other end of the valve is connected to the base and the pressure detector, or the other end of the valve is connected to the gas path of the pressure adjustment mechanism, thereby communicating the valve with the base and the pressure detector, and the online verification contact signal sampling unit is connected to the signal generator.

[0012] More preferably, said online verification contact signal sampling unit is connected to said signal generator.

[0013] More preferably, the gas density relay body further includes a display mechanism including a movement fixed on the base or within the housing and to which the other end of the temperature compensation element is connected via a link or directly, and a pointer attached to the movement, provided in front of the dial, and engaging with the dial to display the gas density value, and / or the display mechanism includes a digital device or a liquid crystal device having a reading display.

[0014] More preferably, the gas density relay body or the smart control unit further includes a resistive contact detection unit connected to a contact signal or directly connected to a signal generator, and under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay is isolated from its control circuit, and when the gas density relay operates to generate a contact signal and / or receives a command to detect the contact resistance of the contact, the resistive contact detection unit can detect the contact resistance value of the gas density relay.

[0015] More preferably, the gas density relay body or the smart control unit further includes an insulation resistance detection unit connected to a contact signal or directly connected to a signal generator, and under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay is isolated from its control circuit, and when the gas density relay operates to generate a contact signal and / or receives a command to detect the contact of the contact to the resistance, the resistance contact detection unit can detect the contact resistance value of the contact of the gas density relay.

[0016] Preferably, the gas density detection sensor is provided in the gas density relay main body, or the pressure adjustment mechanism is provided in the gas density relay main body, or the gas density detection sensor, the online verification contact signal sampling means and the smart control unit are provided in the gas density relay main body, or the pressure adjustment mechanism, the gas density detection sensor, the online verification contact signal sampling means and the smart control unit are provided in the gas density relay main body.

[0017] More preferably, the gas density relay body and the gas density detection sensor are of an integral structure, and preferably, the gas density relay body and the gas density detection sensor are of an integral structure remote type gas density relay.

[0018] Preferably, the gas density detection sensor is of unitary construction.

[0019] More preferably, the gas density detection sensor is an integrated gas density transmitter, and preferably, the online verification contact signal sampling unit and the smart control unit are disposed in the gas density transmitter.

[0020] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, or the gas density detection sensor is a gas density transducer consisting of a pressure sensor and a temperature sensor, or the gas density detection sensor is a density detection sensor using quartz tuning fork technology.

[0021] More preferably, the pressure sensor is mounted on the gas path of the gas density relay body. More preferably, the temperature sensor is installed on or outside the gas path of the gas density relay body, or inside the gas density relay body, or outside the gas density relay body.

[0022] More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor type, a contact type and a non-contact type, a thermal resistance and a thermocouple.

[0023] More preferably, at least one of the temperature sensors is provided adjacent to, on, or integral with a temperature compensating element of the gas density relay body, and preferably, at least one of the temperature sensors is located at an end of the gas density relay body proximate to a temperature compensating element of a pressure detector.

[0024] Furthermore, a lead wire seal is provided within the housing of the gas density relay body, and the connection wire of the temperature sensor is connected to the smart control unit via the lead wire seal.

[0025] More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor and / or an absolute pressure sensor.

[0026] Furthermore, if the pressure sensor is an absolute pressure sensor, it is expressed as an absolute pressure value, and the verification result is the corresponding absolute pressure value at 20°C, and it is expressed as a relative pressure value, and the verification result is converted to the corresponding relative pressure value at 20°C; if the pressure sensor is a relative pressure sensor, it is expressed as a relative pressure value, and the verification result is the corresponding relative pressure value at 20°C, and it is expressed as an absolute pressure value, and the verification result is converted to the corresponding absolute pressure value at 20°C, and the conversion relationship between the absolute pressure value and the relative pressure value is expressed by the following equation. P 絶対圧力 =P 相対圧力 +P 標準大気圧

[0027] Furthermore, the pressure sensor may be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil inductive pressure sensor (e.g., a Badon tube pressure sensor with an inductive coil), a resistive pressure sensor (e.g., a Badon tube pressure sensor with a sliding line resistor), an analog gauge pressure sensor, or a digital gauge pressure sensor.

[0028] Preferably, the gas density relay or monitoring device includes at least two gas density detection sensors, each gas density detection sensor including one pressure sensor and one temperature sensor, and the gas density values ​​detected by each gas density detection sensor are compared to complete mutual verification of each gas density detection sensor.

[0029] Preferably, the gas density detection sensor includes at least two pressure sensors, and the pressure values ​​detected by each pressure sensor are compared to complete mutual validation of each pressure sensor.

[0030] Preferably, the gas density detection sensor includes at least two temperature sensors, and the temperature values ​​detected by each temperature sensor are compared to complete mutual verification of each temperature sensor.

[0031] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, and the pressure values ​​collected by each pressure sensor and the temperature values ​​collected by each temperature sensor are randomly arranged in combination, 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 between 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 traversed through all arrangement combinations, 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 between each pressure sensor and each temperature sensor. The gas density relay converts the gas density values ​​into a plurality of pressure values, i.e., gas density values, corresponding to 20°C according to the gas pressure-temperature characteristics, and compares the gas density values ​​to complete the cross-verification between each pressure sensor and each temperature sensor, or compares the plurality of gas density values ​​of each pressure sensor and each temperature sensor with the comparison density value output signal output by the gas density relay; completes the cross-verification between the gas density relay, each pressure sensor, and each temperature sensor, or compares the plurality of gas density values, pressure values, and temperature values ​​of each pressure sensor and each temperature sensor to complete the cross-verification between the gas density relay, each pressure sensor, and each temperature sensor.

[0032] Preferably, said online verification contact signal sampling unit and said smart control unit are provided together.

[0033] More preferably, said online verification contact signal sampling unit and said smart control unit are sealed within a cavity or housing.

[0034] Preferably, the pressure adjustment mechanism is sealed within the cavity or housing.

[0035] Preferably, during verification, the pressure adjustment mechanism is a sealed gas chamber with a heating element and / or a cooling element installed on the outside or inside, and the temperature of the gas in the sealed gas chamber changes by cooling with the heating element and / or the cooling element, thereby completing the pressure increase and decrease of the gas density relay.

[0036] More preferably, the heating and / or cooling elements are semiconductors. More preferably, the pressure adjustment mechanism further includes a heat retaining member provided outside the sealed gas chamber.

[0037] Preferably, during verification, the pressure adjustment mechanism is a cavity with one open end, the other end of the cavity communicating with the gas density relay body, within the cavity there is a piston with an adjustment rod connected to one end, the outer end of the adjustment rod is connected to a drive member, the other end of the piston protrudes into the opening and makes sealing contact with the inner wall of the cavity, and the drive member drives the adjustment rod to move the piston within the cavity.

[0038] Preferably, during verification, 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 on an outer surface of the sealed gas chamber, and the driving member moves the piston within the cavity by electromagnetic force.

[0039] Preferably, the pressure adjustment mechanism is an airbag having one end connected to a drive member and a volume thereof changed by driving the drive member, the airbag being in communication with the gas density relay body.

[0040] Preferably, the pressure adjustment mechanism is a bellows having one end communicating with the gas density relay body and the other end expanded and contracted by a drive member.

[0041] The driving means in the pressure adjustment mechanism includes, but is not limited to, a magnetic force, an electric motor (variable frequency electric motor or stepping motor), a reciprocating mechanism, a Carnot circulation mechanism, a pneumatic element, and the like.

[0042] Preferably, the pressure regulating mechanism is a purge valve. More preferably, the pressure regulating mechanism further includes a flow valve for controlling the gas release flow rate.

[0043] More preferably, said purge valve is a solenoid valve or an electric valve or other electrically or pneumatically implemented purge valve.

[0044] Preferably, the pressure adjustment mechanism is a compressor.

[0045] Preferably, the pressure adjustment mechanism is a pump, including, but not limited to, one of a production pump, a booster pump, an electric air pump, and an electromagnetic air pump.

[0046] Preferably, the valve is an electrically operated valve, or a solenoid valve, or a permanent magnet solenoid valve, or a piezoelectric valve, or a temperature controlled valve, or a new type of valve made with smart memory materials and which uses electrical heating to open and close.

[0047] Preferably, the valve is latched or opened so that the hose is bent or clamped.

[0048] Preferably, the valve is sealed within the cavity or housing.

[0049] Preferably, the valve and the pressure regulating mechanism are sealed within a cavity or housing.

[0050] Preferably, a pressure sensor is provided on each side of the gas path of the valve.

[0051] Preferably, the electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breaker, current transformer, transformer, gas-filled cabinet, and ring grid cabinet.

[0052] Preferably, said valve communicates with said electrical equipment via an electrical equipment connection.

[0053] Preferably, the sampling of the contact signal of the gas density relay body by the online verification contact signal sampling unit satisfies the following: the online verification contact signal sampling unit has at least two sets of independent sampling contacts, can automatically complete verification for at least two contacts at the same time, and measures continuously, without the need to replace the contacts or reselect the contacts; where the contacts include, but are not limited to, one of an alarm contact, an alarm contact+latch contact, an alarm contact+latch 1 contact+latch 2 contact, or an alarm contact+latch contact+overpressure contact.

[0054] Preferably, the online verification contact signal sampling unit has a test voltage of 24 V or more for the contact signal operation value or its switching value of the gas density relay body. That is, during verification, a voltage of 24 V or more is applied between the contact signal corresponding terminals.

[0055] Preferably, the contacts of the gas density relay are normally open type density relays, and the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contacts of the gas density relay and a contact signal control circuit, and the second connection circuit is connected to the contacts of the gas density relay and the smart control unit; in a non-verification state, the second connection circuit is disconnected or isolated, and the first connection circuit is closed; in a verification state, the online verification contact signal sampling unit disconnects the first connection circuit, communicates with the second connection circuit, and connects the contacts of the gas density relay to the smart control unit.

[0056] Or, the contacts of the gas density relay are normally closed type gas density relays, and the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contacts of the gas density relay and a contact signal control circuit, and the second connection circuit is connected to the contacts of the gas density relay and the smart control unit; in a non-verification state, the second connection circuit is disconnected or isolated, and the first connection circuit is closed; in a verification state, the online verification contact signal sampling unit closes the contact signal control circuit to disconnect the connection between the contacts of the gas density relay and the contact signal control circuit, communicate with the second connection circuit, and connect the contacts of the gas density relay to the smart control unit.

[0057] Preferably, the smart control unit obtains the gas density value collected by the gas density detection sensor; or the smart control unit obtains the pressure value and temperature value collected by the gas density detection sensor, and completes online monitoring of gas density by the gas density relay, i.e., completes online monitoring of the gas density of the monitored electrical equipment by the gas density relay.

[0058] More preferably, the smart control unit adopts an average value method, which sets a collection frequency at a set time interval and averages all collected N gas density values ​​at different time points to obtain the gas density value; or sets a set temperature interval step at a set time interval and averages density values ​​corresponding to N different temperature values ​​collected in all temperature ranges to obtain the gas density value; or sets a set pressure interval step at a set time interval and averages density values ​​corresponding to N different pressure values ​​collected in all pressure change ranges to obtain the gas density value.

[0059] Preferably, the smart control unit obtains the gas density value collected by the gas density detection sensor when a contact signal operation or switching occurs in the gas density relay main body, to complete online verification of the gas density relay; or, the smart control unit obtains the pressure value and temperature value collected by the gas density detection sensor when a contact signal operation or switching occurs in the gas density relay main body, and converts them into a pressure value corresponding to 20°C in gas pressure-temperature characteristic conversion, i.e., a gas density value, to complete online verification of the gas density relay.

[0060] Preferably, the smart control unit automatically controls the entire verification process, including all peripherals, logic and inputs / outputs, based on algorithms and control programs built into the embedded system of a microprocessor.

[0061] More preferably, the smart control unit automatically controls the entire verification process based on embedded algorithms and control programs of general-purpose computers, industrial controllers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded mainboards, etc., and includes all peripherals, logic and inputs and outputs.

[0062] Preferably, the smart control unit is provided with an electrical interface for storing test data, and / or deriving test data, and / or printing test data, and / or communicating with a higher-level machine, and / or inputting analog and digital information.

[0063] More preferably, the gas density relay or monitoring device with online self-verification capability supports input of basic information of the gas density relay, the basic information including, but not limited to, one or more of shipping number, accuracy requirements, rating parameters, manufacturing plant, and operating location.

[0064] Preferably, said smart control unit is further provided with a clock configured to periodically set a verification time of said gas density relay or to record said verification time or said event time.

[0065] Preferably, the circuit of the smart control unit includes a smart control unit protection circuit, which includes, but is not limited to, one or more of ESD, EMI, surge prevention circuit, electrical high-speed protection circuit, radio frequency field prevention circuit, burst prevention circuit, power supply short circuit protection circuit, power supply connection reverse protection circuit, electrical contact misconnection protection circuit, and charging protection circuit.

[0066] Preferably, the gas density relay or monitoring device with online self-verification function further includes a multi-contact, and the gas density relay body, valve, and pressure adjustment mechanism are provided in the multi-contact, or the valve and pressure adjustment mechanism are provided in the multi-contact, or the gas density relay body, gas density detection sensor, valve, and pressure adjustment mechanism are provided in the multi-contact.

[0067] More preferably, the gas density relay or monitoring device with online self-verification function further includes a first connecting duct, a gas path of the pressure regulating mechanism communicates with the gas density relay body via the first connecting duct, and a first port of the multi-contact communicates with a portion of the first connecting duct between the gas density relay body and the pressure regulating mechanism.

[0068] More preferably, the valve communicates with a second port of the multi-contact and communicates with the gas density relay body via the multi-contact.

[0069] More preferably, a port connecting the valve and an electrical equipment is connected to a first port of the multi-contact, the gas density relay body is connected to the multi-contact via the valve, and a second port of the multi-contact is connected to an electrical equipment.

[0070] More preferably, the temperature sensor is connected to the gas path of said multi-contact or to the third port of the multi-contact.

[0071] Preferably, the gas density relay with online self-verification function further includes a self-sealing valve installed between the electrical equipment and the valve, or a valve installed between the electrical equipment and the self-sealing valve.

[0072] Preferably, the gas density relay or monitoring device with online self-verification function further includes a gas replenishment connection provided in the pressure regulating mechanism, or a gas replenishment connection provided in the electrical equipment, or a gas replenishment connection provided between the electrical equipment and the valve, or a second connecting duct connecting the valve and the gas path of the pressure regulating mechanism, or a second connecting duct connecting the valve and the gas density relay main body.

[0073] Preferably, the gas density relay or monitoring device with online self-verification function further includes a display port for man-machine interaction, connected to said smart control unit, displaying current verification data in real time and / or supporting data input.

[0074] Preferably, the gas density relay or monitor with online self-verification function includes a micro water sensor connected to the gas density relay body and the smart control unit respectively.

[0075] More preferably, the gas density relay or monitoring device with online self-verification function further includes a gas circulation mechanism connected to the gas density relay body and the smart control unit respectively, and the gas circulation mechanism includes a capillary tube, a sealed gas chamber, and a heating element.

[0076] Furthermore, the micro water sensor may be attached to the sealed cavity, the capillary, the capillary mouth, or outside the capillary of the gas circulation mechanism.

[0077] Preferably, the gas density relay or monitor with online self-verification function further includes a decomposition product sensor connected to the gas density relay body and the smart control unit respectively.

[0078] Preferably, the gas density relay or monitor with online self-verification function further includes a camera for monitoring.

[0079] Preferably, the gas density relay or monitoring device with online self-verification function further includes a background monitoring terminal which realizes remote communication with the background monitoring terminal through communication equipment; the communication equipment is used to realize data transmission between the gas density relay or monitoring device and the background monitoring terminal.

[0080] More preferably, said background monitoring terminal includes storage means for storing data and / or information transmitted to the background monitoring terminal via said communications facility.

[0081] More preferably, the background monitoring terminal includes a display port for man-machine interaction, and displays current verification data in real time and / or supports data input, specifically including real-time online gas density value display, pressure value display, temperature value display, change trend analysis, historical data inquiry, real-time warning, etc.

[0082] More preferably, the communication facility is provided in a housing of the gas density relay or monitor, or in a housing of the smart control unit, or the communication facility and the smart control unit are of integral construction. More preferably, the communication method of the communication equipment is wired communication or wireless communication.

[0083] Further, the wired communication method includes, but is not limited to, one or more of RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable cable. Further, the wired communication method includes, but is not limited to, one or more of 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, sonic, satellite, light wave, quantum communication, and acoustic.

[0084] More preferably, the control of said smart control unit is controlled by a field control and / or by a background monitoring terminal.

[0085] Furthermore, the gas density relay or monitoring device with online self-verification function completes online verification of the gas density relay according to the setting or remote control command of the background monitoring terminal; or completes online verification of the gas density relay according to the set verification time of the gas density relay.

[0086] More preferably, the gas density relay or monitoring device with online self-verification function further includes a shield capable of shielding electric and / or magnetic fields, the shield being disposed in a smart control unit and / or communication equipment.

[0087] The above shielding member is intended to reduce EMI radiation by utilizing the reflection and / or absorption properties of the shielding material, and the addition of the shielding material can effectively reduce or remove unnecessary slits, suppress electromagnetic coupling radiation, and reduce electromagnetic leakage and interference; a material with relatively high electrical conductivity and magnetic conductivity is used as the electromagnetic shielding material (e.g., iron), which is generally required to have a shielding performance of 40 to 60 dB. Specifically, the circuit control part can be sealed within a housing made of the shielding material, and good sealing can eliminate the problem of interference caused by electromagnetic leakage due to discontinuity in the electrical conductivity of the slits.

[0088] More preferably, the gas density relay body has a comparison density value output signal connected to the smart control unit, or the gas density relay body has a comparison pressure value output signal connected to the smart control unit.

[0089] Furthermore, when the gas density relay body outputs a comparative density value output signal, the smart control unit collects the gas density value at that time, performs comparison, and completes the verification of the comparative density value of the gas density relay body, and the smart control unit and / or the background monitoring terminal judges the comparison result, and notifies an abnormality if the error is temporarily bad.

[0090] Alternatively, when the gas density relay body outputs a comparison density value output signal, the smart control unit collects and compares the gas density value at that time to complete mutual verification between the gas density relay body and the gas density detection sensor, and the smart control unit and / or the background monitoring terminal judges the comparison result, and sends an abnormality notification if the error is temporarily bad.

[0091] Alternatively, when the gas density relay main body outputs a comparison pressure value output signal, the smart control unit collects and compares the pressure value at that time, and completes mutual verification between the gas density relay main body and the gas density detection sensor, and the smart control unit and / or the background monitoring terminal judges the comparison result, and sends an abnormality warning if the error is temporarily bad.

[0092] More preferably, at least two of the gas density relays or monitors with online self-verification function are connected to the background monitoring terminal by a hub and a protocol converter in turn, and each gas density relay or monitor is installed in a corresponding electrical equipment.

[0093] Furthermore, the hub adopts an RS485 hub.

[0094] Furthermore, the protocol converter uses an IEC61850 or IEC104 protocol converter.

[0095] More preferably, the protocol converter is connected to a network service printer and a network data router, respectively.

[0096] In the above, the gas density relay with the online self-verification function generally refers to a device whose components are designed as an integrated structure, and the gas density monitor generally refers to a device whose components are designed as separate structures and are flexibly configured.

[0097] A second aspect of the present application provides a verification method for a gas density relay, including: under normal operating conditions, the gas density relay monitors a gas density value in an electrical equipment; the gas density relay closes a valve through a smart control unit according to a set verification time and a situation of the gas density value when the verification of the gas density relay is allowed; and the smart control unit drives a pressure regulating mechanism to slowly reduce the gas pressure and cause a contact operation in the gas density relay body; the contact operation is transmitted to the smart control unit by verifying an online contact signal sampling unit; the smart control unit obtains a gas density value according to the pressure value and temperature value at the time of the contact operation, or directly obtains the gas density value, detects the contact signal operation value of the gas density relay body, and completes the verification operation of the contact signal operation value of the gas density relay; and after all the contact signal verification operations are completed, the smart control unit opens the valve.

[0098] Preferably, the verification method of the gas density relay includes: in a normal operating state, the gas density relay monitors a gas density value in an electrical equipment, and the gas density relay online monitors the gas density value in the electrical equipment through a gas density detection sensor and a smart control unit; the gas density relay closes a valve through the smart control unit in a state in which the verification of the gas density relay is allowed according to a set verification time and a situation of the gas density value, and adjusts the online verification contact signal sampling unit to a verification state through the smart control unit; in the verification state, the online verification contact signal sampling unit disconnects a contact signal control circuit of the gas density relay body, connects the contact of the gas density relay body to the smart control unit, and drives a pressure regulating mechanism through the smart control unit to slowly reduce the gas pressure, causing a contact operation in the gas density relay body, and the contact operation is smart controlled by verifying the online contact signal sampling unit. The smart control unit obtains the gas density value according to the pressure value and temperature value when the contact is operating, or directly obtains the gas density value, detects the contact signal operating value of the gas density relay body, and completes the verification operation of the contact signal operating value of the gas density relay. The pressure regulating mechanism is driven by the smart control unit to slowly increase the gas pressure, causing the gas density relay body to reset the contact. The contact reset is transmitted to the smart control unit by verifying the online contact signal sampling unit. The smart control unit obtains the gas density value according to the pressure value and temperature value when the contact is reset, or directly obtains the gas density value, detects the return value of the contact signal of the gas density relay body, and completes the verification operation of the contact signal return value of the gas density relay. After all the contact signal verification operations are completed, the smart control unit opens the valve, and adjusts the online verification contact signal sampling unit to the working state, and the contact signal control circuit of the gas density relay body is restored to the normal working state.

[0099] Preferably, the contact signal includes an alarm and / or a latch.

[0100] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor, or the gas density detection sensor is a gas density transducer consisting of a pressure sensor and a temperature sensor, or the gas density detection sensor is a density detection sensor using quartz tuning fork technology.

[0101] Preferably, after the gas density relay has been verified, if there is an abnormality, it can automatically issue an alarm and upload it to a remote location or transmit it to a designated receiver.

[0102] Preferably, the verification method further comprises displaying the gas density values ​​and verification results on-site or by a background monitoring terminal.

[0103] Preferably, the verification method further comprises: control of the smart control unit being controlled by a field control and / or background monitoring terminal.

[0104] A third aspect of the present application provides a method for modifying a gas density relay, including: communicating a gas density detection sensor with a gas density relay body, connecting a gas path of the gas density relay body to a first port of a multi-contact, connecting a gas path of a pressure adjustment mechanism to a second port of the multi-contact, the first port communicating with the second port, thereby communicating the gas path of the pressure adjustment mechanism with the gas density relay body, the pressure adjustment mechanism adjusting and raising or lowering the pressure of the gas density relay body, generating a contact signal operation in the gas density relay body, and an online verification contact signal sampling unit. a smart control unit connected directly or indirectly to the gas density relay body, the online verification contact signal sampling unit sampling the contact signal of the gas density relay body at ambient temperature; a smart control unit respectively connected to the gas density detection sensor, the pressure regulating mechanism and the online verification contact signal sampling unit, completing the control of the pressure regulating mechanism, the collection of pressure values ​​and temperature values, and / or the collection of gas density values, and detecting the contact signal operating value and / or contact signal return value of the gas density relay body, the contact signal including an alarm and / or a latch.

[0105] Preferably, the gas density relay modification method further includes: connecting one end of the valve to an electrical equipment, connecting the other end of the valve to the pressure regulating mechanism and the gas path of the gas density relay body, and further connecting the valve to the smart control unit, and opening and closing the valve under the control of the smart control unit.

[0106] More preferably, the method for retrofitting a gas density relay further comprises mounting a self-sealing valve between the multi-contact and the valve, or mounting the valve between the multi-contact and the self-sealing valve. Effect of the Invention

[0107] Compared with the prior art, the technical solutions of the present disclosure have the following beneficial effects:

[0108] The present application provides a gas density relay for use in high and medium voltage electrical equipment, which includes a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a valve, an online verification contact signal sampling unit, and a smart control unit, and a method for modifying the gas density relay with online self-verification function and a verification method thereof. The smart control unit closes the valve to make the gas density relay body disconnect from the electrical equipment in the gas path; the pressure regulating mechanism adjusts the rise and fall of the pressure to generate a contact operation in the gas density relay body, and the contact operation is transmitted to the smart control unit by the online contact signal sampling unit, and the smart control unit detects the operation value and / or return value of the alarm and / or latch contact signal of the gas density relay body according to the density value at the time of contact operation. The present application further provides a communication device for remote communication with a background monitoring terminal, which can complete the verification work of the gas density relay without the need for maintenance personnel to go to the site, greatly improving the reliability of the power grid, improving efficiency, and reducing costs. The present application further provides a smart control unit for mutual self-verification between the gas density relay body and the gas density detection sensor, thereby realizing a maintenance-free gas density relay with online self-verification function. At the same time, the entire verification process of the disclosed technology can achieve zero emission of SF6 gas, meeting the requirements of environmental protection protocols.

[0109] 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]

[0110] [Figure 1] 1 is a structural schematic diagram of a gas density relay or monitoring device of Example 1. FIG. [Diagram 2] FIG. 11 is a structural schematic diagram of a gas density relay or monitoring device of the second embodiment. [Diagram 3] FIG. 11 is a schematic diagram of the structure of a gas density relay or monitor of the third embodiment. [Figure 4]FIG. 11 is a structural schematic diagram of a gas density relay or monitoring device of the fourth embodiment. [Diagram 5] FIG. 11 is a structural schematic diagram of a gas density relay or monitoring device of Example 5. [Figure 6] FIG. 13 is a structural schematic diagram of a gas density relay or monitoring device of Example 6. [Figure 7] FIG. 13 is a structural schematic diagram of a gas density relay or monitoring device of Example 7. [Figure 8] FIG. 13 is a structural schematic diagram of a gas density relay or monitoring device of Example 8. [Figure 9] FIG. 13 is a structural schematic diagram of a gas density relay or monitoring device of Example 9. [Figure 10] FIG. 16 is a structural schematic diagram of a gas density relay or monitoring device of Example 10. [Figure 11] FIG. 15 is a structural schematic diagram of a gas density relay or monitoring device of Example 11. [Figure 12] FIG. 12 is a structural schematic diagram of a gas density relay or monitoring device of Example 12. [Figure 13] FIG. 13 is a structural schematic diagram of a gas density relay or monitoring device of Example 13. [Figure 14] FIG. 14 is a structural schematic diagram of a gas density relay or monitoring device of Example 14. [Figure 15] FIG. 15 is a structural schematic diagram of a gas density relay or monitoring device of Example 15. [Figure 16] FIG. 16 is a schematic diagram of a control circuit for a gas density relay or monitor of Example 16. [Figure 17] FIG. 23 is a schematic diagram of a control circuit for a gas density relay or monitor of Example 17. [Figure 18] FIG. 1 is a schematic diagram of a 4-20 mA type density transmitter circuit on a gas density relay or monitor. [Figure 19] FIG. 23 is a schematic diagram of the architecture of the gas density relay system of Example 19. [Figure 20] FIG. 20 is a schematic diagram of the architecture of a gas density relay system of Example 20. [Figure 21] FIG. 21 is a schematic diagram of the architecture of the gas density relay system of Example 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0111] In order to make the objectives, technical solutions and effects of the present disclosure clearer and more precise, the present disclosure will be described in more detail below with reference to the drawings. It should be understood that the specific examples described herein are only for the purpose of interpreting the present disclosure, and are not intended to limit the present disclosure.

[0112] Example 1 1, a gas density relay or monitoring device with online verification function includes a gas density relay body 1, which includes a housing 101, a base 102 provided in the housing 101, an end base 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, and a dial 107. One end of the pressure detector 103 is fixedly connected to the base 102, and the other end of the pressure detector 103 is connected to one end of the temperature compensation element 104 via the end base 108, and the other end of the temperature compensation element 104 is provided with a beam provided with an adjustment member for pressing the signal generator 109 to turn on / off the contact of the signal generator 109. The movement 105 is fixed to the base 102, the other end of the temperature compensation element 104 is further connected to the movement 105 via a connecting rod or directly connected to the movement 105, the pointer 106 is attached to the movement 105 and disposed in front of the dial 107, and the pointer 106 is coupled with the dial 107 to display the gas density value. The gas density relay body 1 may include a digital device or a liquid crystal device having a display value display.

[0113] In addition, the gas density relay or monitoring device with online verification function further includes a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealedly connected to an electrical equipment by an electrical equipment connection joint 1010, and the other end of the valve 4 communicates with a base 102; the pressure sensor 2 communicates with a pressure detector 103 in a gas path; the pressure regulating mechanism 5 communicates with the pressure detector 103; the online verification contact signal sampling unit 6 is respectively connected to a signal generator 109 and the smart control unit 7; the valve 4 and the pressure regulating mechanism 5 are further respectively connected to the smart control unit 7.

[0114] However, the signal generator 109 includes a microswitch or a magnetically assisted electrical 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; and the temperature compensation element 104 uses a temperature compensation sheet or a gas sealed in a housing. The gas density relay of the present application may include an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch, or a gas pressure meter.

[0115] In the gas density relay of the first embodiment, the temperature compensation element 104 is used to compensate for the changing pressure and temperature based on the pressure detector 103 so as to reflect the change in the density of sulfur hexafluoride gas. That is, under the pressure of sulfur hexafluoride (SF6) gas, which is the medium to be measured, when the density value of sulfur hexafluoride gas changes due to the action of the temperature compensation element 104, the pressure value of sulfur hexafluoride gas also changes accordingly, and a corresponding elastic deformation displacement inevitably occurs at the end of the pressure detector 103, which is transmitted to the movement 105 via the temperature compensation element 104, and when the measured density value of sulfur hexafluoride gas is transmitted to the pointer 106 by the movement 105, the measured density value of sulfur hexafluoride gas is displayed on the dial 107. The signal generator 109 is an alarm output latch contact. In this way, the gas density relay main body 1 can display the density value of sulfur hexafluoride gas. If gas leakage occurs, the density value of sulfur hexafluoride gas will decrease, and a corresponding downward displacement will be generated in the pressure detector 103, which will be transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 will further transmit it to the pointer 106, so that the pointer 106 moves in the direction of decreasing the indicated value, and the dial 107 will specifically display the degree of gas leakage; at the same time, the pressure detector 103 drives the beam to be displaced downward by the temperature compensation element 104, and the adjusting member on the beam gradually separates from the signal generator 109, and when it reaches a certain degree, the contact of the signal generator 109 will be connected and a corresponding contact signal (alarm or latch) will be sent out, and the density of sulfur hexafluoride gas in equipment such as electric switches will be reached to monitor and control the gas, so as to ensure the safe operation of the electric equipment.

[0116] When the gas density value increases, 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 increases accordingly, causing a corresponding upward displacement in the end of the pressure detector 103 and the temperature compensation element 104, which in turn causes the beam to also displace upward, causing the adjustment member on the beam to displace upward, pushing the contact of the signal generator 109 to open, and releasing the contact signal.

[0117] In the above embodiment, the valve 4 may be of various kinds, and may be a shutoff valve, such as a ball valve, a butterfly valve, a gate valve, a shutoff valve, a cock, a butterfly valve, a needle valve, a diaphragm valve, etc. If it is a ball valve, the ball valve can be driven by rotating the self-sealing valve core to close the vent of the switch equipment, and specifically, it can be flexibly designed according to actual needs. The valve 4 may be automatic, or may be manually or semi-manually verified.

[0118] The type of pressure sensor 2 may be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number of them may be multiple. The pressure sensor may be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil-inductive pressure sensor (e.g., a Badon tube pressure measurement sensor with an induction coil), a resistive pressure sensor (e.g., a Badon tube pressure measurement sensor with a sliding line resistor), an analog gauge pressure sensor, or a digital gauge pressure sensor. Pressure is collected by 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).

[0119] The temperature sensor 3 may be a thermocouple, a thermistor, a semiconductor type, a contact type or a non-contact type, or a thermal resistor or a thermocouple. In short, various temperature-sensitive elements such as a temperature sensor and a temperature transducer can be used for temperature collection.

[0120] The online verification contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay main body 1. That is, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) It does not affect the safe operation of the electrical equipment during verification, that is, when the contact signal of the gas density relay main body 1 operates during verification, it does not affect the safe operation of the electrical equipment; 2) The contact signal control circuit of the gas density relay main body 1 does not affect the performance of the gas density relay, especially the performance of the smart control unit 7, and does not damage the gas density relay or affect the test operation.

[0121] The basic requirement or function of the smart control unit 7 is to control the valve 4, the pressure adjustment mechanism 5, and collect signals through the smart control unit 7. Detect the pressure value and temperature value when the contact signal of the gas density relay main body 1 is activated, and obtain the corresponding pressure value P at 20°C. 20 In other words, the contact operation value P of the gas density relay body 1 is converted to D20 , and completes the verification operation of the gas density relay body 1. Or, when the contact signal of the gas density relay body 1 is activated, the density value P D20 The smart control unit 7 can directly detect the pressure of the gas density relay body 1 and complete the verification operation of the gas density relay body 1. At the same time, the self-verification operation between the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 is completed by testing the rated pressure value of the gas density relay body 1, and maintenance-free is realized. 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 the remote transmission of test data and / or information such as verification result through the communication module; when the rated pressure value of the gas density relay 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 body 1.

[0122] The electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, breakers, current transformers, voltage transformers, transformers, gas-filled cabinets, ring grid cabinets, etc.

[0123] The locations of the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjustment mechanism 5, the online verification contact signal sampling unit 6, the smart control unit 7 and the multi-contact 9 can be flexibly arranged according to need. For example, the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be arranged together, or the valve 4 and the pressure adjustment mechanism 5 can be arranged together. In short, the locations of the gas density relay body 1, the gas density detection sensor, the pressure adjustment mechanism 5, the valve 4, the online verification contact signal sampling means 6 and the smart control unit 7 can be flexibly arranged according to need.

[0124] The operation principle of the verification and monitoring of the gas density relay or monitor of this embodiment is as follows. The smart control unit 7 monitors the gas pressure and temperature of the electrical equipment through the pressure sensor 2 and the temperature sensor 3, and outputs the corresponding pressure value P at 20°C. 20 (i.e., gas density value). If it is necessary to verify the gas density relay body 1, the gas density value P 20 ≧Set safety verification density value P S If so, the gas density relay will issue a command, i.e. close the valve 4 through the smart control unit 7 to isolate the gas density relay body 1 from the electrical equipment in the gas path. Then, the smart control unit 7 will open the control circuit of the gas density relay body 1, so as not to affect the safe operation of the electrical equipment when the gas density relay body 1 is verified online, and also to avoid falsely sending an alarm signal or latching the control circuit when verifying. Because the gas density relay must first determine the gas density value P before starting the verification. 20 ≧Set safety verification density value P SSince the gas in the electrical equipment is monitored and judged, the gas in the electrical equipment is within the safe operating range, and the gas leakage is a process that progresses slowly, so it is safe at the time of verification. At the same time, the smart control unit 7 communicates with the contact sampling circuit of the gas density relay body 1, and then the smart control unit 7 controls the driving member 52 of the pressure regulating mechanism 5 (which can be realized by adopting an electric motor (motor) and a gear, and its manner is diverse and flexible) to generate a volume change in the sealed gas chamber composed of the pressure regulating mechanism 5, the gas density relay body 1, the valve 4, etc., so as to gradually reduce the gas pressure in the gas density relay body 1, and generate a contact operation in the gas density relay body 1. The contact operation is uploaded to the smart control unit 7 by the online contact signal sampling unit 6, and the smart control unit 7 determines the pressure value P corresponding to 20°C according to the gas characteristics according to the pressure value and temperature value measured during the contact operation. 20 (density value), and the contact operation value P of the gas density relay body 1 D20 can be detected. After detecting all the contact operation values ​​of the alarm and / or latch signal of the gas density relay main body 1, the smart control unit 7 controls the driving member 52 of the pressure adjustment mechanism 5 to gradually increase the gas pressure of the gas density relay main body 1, and measure the return value of the alarm and / or latch contact signal of the gas density relay main body 1. In this way, the verification is repeated multiple times (for example, 2 to 3 times) and the average value is calculated, thereby completing the verification work of the gas density relay main body 1. Then, the smart control unit 7 opens the contact sampling circuit of the gas density relay main body 1, and at this time, the contact of the gas density relay main body 1 is not connected to the smart control unit 7. At the same time, the smart control unit 7 opens the valve 4, so that the gas density relay main body 1 communicates with the electrical equipment through the gas path. The smart control unit 7 communicates with the control circuit of the gas density relay main body 1, the density monitoring circuit of the gas density relay main body 1 operates normally, and the gas density relay main body 1 safely monitors and controls the gas density of the electrical equipment, making the electrical equipment operate safely and reliably. In this way, the online verification work of the gas density relay body 1 can be easily completed, and at the same time, the online verification of the gas density relay body 1 will not affect the safe operation of the electrical equipment.

[0125] After the gas density relay main body 1 completes the verification work, the gas density relay can make a judgment and announce the detection result. The method is flexible, specifically including: 1) the gas density relay can announce on the spot, for example by displaying an indicator lamp, digital or liquid crystal display, etc.; 2) the gas density relay can upload by online remote communication method, for example by uploading to the background of the online monitoring system; 3) the gas density relay can upload to a specific terminal by wireless upload, for example by wireless upload to a mobile phone; 4) the gas density relay can upload by another route; 5) the abnormal result can be sent by an alarm signal line or a dedicated signal line; 6) the gas density relay can be uploaded alone or bundled with other signals. In short, after the gas density relay completes the verification work, if there is an abnormality, it can automatically issue an alarm, which can be uploaded to a remote location or sent to a designated receiver, for example, a mobile phone. Alternatively, after the gas density relay completes the verification work, if there is an abnormality, the intelligent control unit 7 can upload to a remote location (such as a monitoring room, background monitoring platform, etc.) by the alarm contact signal of the gas density relay main body 1, and can also display an announcement 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, a contact can be connected in parallel to the alarm signal contact, and the state can be obtained by analysis; or it can be uploaded through an independent verification signal line. Specifically, it can be uploaded under good conditions, it can be uploaded when there is a problem, it can be uploaded by remote online density monitoring, 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. The gas density relay has a safety protection function. Specifically, when the gas density value of the device falls below the set value, the gas density relay will not automatically perform online verification and will send a warning signal. For example, when the gas density value of the device falls below the set value P S If the pressure is less than 0.02MPa, no verification is performed. Online verification is possible only when the gas density value of the device is ≥ (alarm pressure value + 0.02MPa).

[0126] The gas density relay may be verified online based on a set time, or may be verified online based on a set temperature (e.g., high limit, high limit, low limit, low limit, normal temperature, 20 degrees, etc.). When verifying online at high, low, normal, and 20°C environmental temperatures, the requirements for error judgment are different. For example, when verifying at an environmental temperature of 20°C, the accuracy requirements for the gas density relay can be 1.0 or 1.6, and for high temperatures, 2.5. Specifically, it can be implemented according to the relevant standards depending on the temperature requirements. For example, the accuracy requirements for each temperature value are as specified in the temperature compensation performance section of Article 4.8 of DL / T259 "Sulfur Hexafluoride Gas Density Relay Verification Protocol".

[0127] The gas density relay can compare its error performance according to different temperatures and different time periods. That is, the gas density relay judges the performance of the electrical equipment by comparing different periods and the same temperature range. The gas density relay has a comparison of each time period of the history and a comparison of the history with the present. The gas density relay can repeat the verification multiple times (for example, 2 to 3 times), and calculates the average value based on the verification results of each time. If necessary, the gas density relay can perform online verification at any time. At the same time, the gas density relay can also monitor the gas density value, and / or pressure value, and / or temperature value of the electrical equipment online, and upload the monitored data to the target equipment to enable online monitoring.

[0128] Example 2 As shown in FIG. 2, the gas density relay or monitoring device has an online self-verification function, and includes a gas density relay body 1 (the gas density relay body 1 mainly includes a housing, a base arranged in the housing, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end base, a plurality of signal generators and electrical equipment connection joints), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7.

[0129] One end of the valve 4 is sealedly connected to the electrical equipment through the electrical equipment connection joint 1010, and the other end of the valve 4 is connected to the base of the gas density relay body 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the smart control unit 7 are installed on or in the housing of the gas density relay body 1, 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 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 pressure sensor 2 and the temperature sensor 3 are connected to the smart control unit 7; the valve 4 is connected to the smart control unit 7; the pressure adjustment mechanism 5 is connected to the smart control unit 7.

[0130] Different from the first embodiment, the pressure adjusting mechanism 5 in this embodiment is a cavity with one end open, a piston 51 with a seal ring 510 is provided in the cavity, an adjusting rod with an outer end connected to a driving member 52 is connected to one end of the piston 51, the other end of the piston 51 protrudes into the opening and contacts the inner wall of the cavity, the driving member 52 drives the adjusting rod to further move the piston 51 in the cavity, and the volume of the sealing part in the cavity is changed to further complete the rise and fall of the pressure. The driving member 52 includes, but is not limited to, one of a magnetic force, an electric motor (variable frequency electric motor or stepping electric motor), a reciprocating mechanism, a Carnot circulation mechanism, and a pneumatic element. In another preferred embodiment, the pressure regulating mechanism 5 may be a solenoid valve sealed in a housing. The pressure regulating mechanism 5 opens the solenoid valve to cause a pressure change according to the control of the smart control unit 7, and further completes the increase and decrease of the pressure.

[0131] In another preferred embodiment, the pressure adjustment mechanism 5 may be configured by a bellows that is sealed and connected to the pressure detector of the gas density relay body 1, and a driving member 52 to form a securely sealed gas chamber. In the pressure adjustment mechanism 5, under the control of the smart control unit 7, the driving member 52 pushes the bellows to change the volume, which in turn changes the volume of the sealed gas chamber, thereby completing the increase and decrease of pressure.

[0132] In another preferred embodiment, the pressure adjustment mechanism 5 may be composed of a gas chamber having a heating element on the outside (or inside), the heating element, and a heat-retaining material, and the temperature is changed by heating, and further, the pressure is increased or decreased.

[0133] Of course, the pressure adjustment mechanism 5 may have various other forms and is not limited to the above, and other mechanisms capable of realizing the pressure raising and lowering function are also included in the scope of protection of the present disclosure.

[0134] By adjusting the pressure by this pressure adjustment mechanism 5, a contact operation is generated in the signal generator of the gas density relay main body 1, and the contact operation is transmitted to the smart control unit 7 via the online verification contact signal sampling means 6. The smart control unit 7 detects the alarm and / or latch contact signal operation value and / or return value of the gas density relay based on the gas density value when the gas density relay main body 1 generates a contact operation, or converts the pressure value and temperature value into a corresponding gas density value, and completes the verification operation of the gas density relay. Alternatively, the verification operation of the gas density relay can be completed when the alarm and / or latch contact operation value is detected.

[0135] Example 3 3, compared to Example 2, this Example further includes a gas refill port 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is sealed and connected to an electrical device, and the other end of the self-sealing valve 11 communicates with one end of the valve 4, the gas refill port 10, via a connecting duct.

[0136] Example 4 As shown in Fig. 4, this is a gas density relay or monitoring device with an online self-verification function, which is different from the second embodiment in that the other end of the valve 4 is connected to the gas path of the pressure regulating mechanism 5 through a connecting duct, and the valve 4 communicates with the base of the gas density relay body 1 and the pressure detector. Of course, this fourth embodiment can also add a gas refill port and a self-sealing valve. For example, one end of the self-sealing valve is sealed and connected to an electrical device, and the other end of the self-sealing valve communicates with one end of the valve 4, the gas refill port, through a connecting duct.

[0137] Example 5 As shown in FIG. 5, a gas density relay or monitoring device with an online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealedly connected to an electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 is connected to the base of the gas density relay body 1, the pressure sensor 2, and the pressure adjustment mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are provided on the rear side of the housing of the gas density relay body 1. The online verification contact signal sampling unit 6 and the smart control unit 7 are provided on the electrical equipment connection joint. The pressure sensor 2 is connected to the pressure detector through a gas path through the base of the gas density relay body 1, and the pressure adjustment mechanism 5 is connected to the pressure detector of the gas density relay body 1. 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. Unlike the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are provided on the rear side of the housing of the gas density relay main body 1.

[0138] Example 6 As shown in Fig. 6, the gas density relay or monitoring device with online self-verification function 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, and a smart control unit 7. One end of the valve 4 is sealedly connected to an electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 communicates with a connection duct, the connection duct communicates with the pressure detector of the gas density relay body 1, the pressure sensor 2 and the pressure regulating mechanism 5 also communicate with the connection duct, and the valve 4, the pressure sensor 2, the pressure regulating mechanism 5, and the pressure detector communicate on a gas path. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the online verification contact signal sampling unit 6, and the smart control unit 7 are installed in a housing; the online verification contact signal sampling unit 6 and the smart control unit 7 are installed together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected to a smart control unit 7; the valve 4 is connected to a smart control unit 7; and the pressure regulating mechanism 5 is connected to a smart control unit 7.

[0139] The difference from the first embodiment is that the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjustment mechanism 5, the online verification contact signal sampling unit 6 and the smart control unit 7 are arranged in one housing. 1) The pressure adjustment mechanism 5 in this embodiment is mainly composed of a piston 51 and a driving member 52. The piston 51 is sealedly connected to the pressure detector and the pressure sensor 2 of the gas density relay body 1 to form a securely sealed gas chamber. In the pressure adjustment mechanism 5, the driving member 52 pushes the piston 51 according to the control of the smart control unit 7 to change the volume of the sealed gas chamber, and further completes the rise and fall of the pressure. 2) Although the pressure sensor 2 and the temperature sensor 3 are arranged in one housing, the gas density transmitter may be integrally configured to directly obtain the density value, pressure value and temperature value of the gas.

[0140] Example 7 As shown in FIG. 7, a gas density relay or gas density monitoring device with online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealed connected to the electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 is communicated with the pressure detector of the gas density relay body 1. The gas density relay body 1, the temperature sensor 3, the online verification contact signal sampling unit 6, and the smart control unit 7 are provided together. The pressure sensor 2 communicates with the pressure detector of the gas density relay body 1 in a gas path; the pressure adjustment mechanism 5 communicates with the pressure detector of the gas density relay body 1 in a gas path. 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.

[0141] Unlike the first embodiment, the pressure adjustment mechanism 5 of this embodiment is mainly composed of an airbag 53 and a driving member 52. In the pressure adjustment mechanism 5, the driving member 52 pushes the airbag 53 to change the volume according to the control of the smart control unit 7, and further completes the increase and decrease of the pressure.

[0142] Example 8 As shown in FIG. 8, a gas density relay or monitoring device with an online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealed connected to an electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 is connected to the pressure detector of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are provided in the gas density relay body 1, and the pressure sensor 2 is connected to the pressure detector of the gas density relay body 1 in a gas path. The pressure adjustment mechanism 5 is connected to the pressure detector of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are connected to the smart control unit 7; the valve 4 is connected to the smart control unit 7; the pressure adjustment mechanism 5 is connected to the smart control unit 7.

[0143] Unlike the first embodiment, the valve 4 is sealed in the first housing 41, and the control cable of the valve 4 is drawn out through the first lead-out seal 42 sealed in the first housing 41, thus designed to maintain the sealing of the valve 4 and ensure reliable operation over a long period of time. The pressure adjustment mechanism 5 is sealed inside the second housing 55, and the control cable of the pressure adjustment mechanism 5 is drawn out through the second lead-out seal 56 sealed in the second housing 55, thus designed to maintain the sealing of the pressure adjustment mechanism 5 and ensure reliable operation over a long period of time. The second housing 55 and the first housing 41 may be integrated into one body.

[0144] Example 9 As shown in FIG. 9, a gas density relay or monitoring device with online self-verification function 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, and a smart control unit 7. One end of the valve 4 is sealed connected to an electrical equipment through an electrical equipment connection joint, the other end of the valve 4 is connected to the pressure regulating mechanism 5, and the pressure sensor 2 is provided in the pressure regulating mechanism 5. The temperature sensor 3, the online verification contact signal sampling unit 6, the smart control unit 7, and the gas density relay body 1 are installed in the pressure regulating mechanism 5. The pressure detector of the gas density relay body 1, the pressure sensor 2, the pressure regulating mechanism 5, and the valve 4 are communicated by a gas path. The temperature sensor 3, the online verification contact signal sampling unit 6, and the smart control unit 7 are installed together. The pressure sensor 2 and the temperature sensor 3 are connected to the smart control unit 7; the valve 4 is connected to the smart control unit 7; and the pressure regulating mechanism 5 is connected to the smart control unit 7.

[0145] Example 10 As shown in FIG. 10, a gas density relay or monitoring device with online self-verification function includes a gas density relay body 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure regulating mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealed connected to an electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 is communicated 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, and the first pressure sensor 21 is installed in the pressure regulating mechanism 5. The second pressure sensor 22 and the second temperature sensor 32 are installed on the side where the valve 4 is connected to the electrical connection joint. The first pressure sensor 21 and the pressure detector of the gas density relay main body 1 are connected to the pressure adjustment mechanism 5 in the gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected 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.

[0146] Unlike the first embodiment, the pressure sensors are two, a first pressure sensor 21 and a second pressure sensor 22, and the temperature sensors are two, a first temperature sensor 31 and a second temperature sensor 32. In this embodiment, the temperature sensor 32 may be omitted. This embodiment has multiple pressure sensors and temperature sensors, and can perform comparison and cross-verification between pressure values ​​monitored by the multiple pressure sensors; can perform comparison and cross-verification between temperature values ​​obtained by the multiple temperature sensors; and can perform comparison and cross-verification between corresponding multiple gas density values ​​monitored by the multiple pressure sensors and the multiple temperature sensors.

[0147] Example 11 As shown in FIG. 11, a gas density relay or monitoring device with an online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, and a smart control unit 7. One end of the valve 4 is sealed and connected to an electrical equipment through an electrical equipment connection joint, and the other end of the valve 4 is connected to a connection duct, which is connected to a pressure detector of the gas density relay body 1. The pressure sensor 2 and the pressure adjustment mechanism 5 are also connected to the connection duct, and the valve 4, the pressure sensor 2, the pressure adjustment mechanism 5, and the pressure detector are connected by a gas path. The temperature sensor 3 is provided on the side where the valve 4 is connected to the electrical connection joint. The online verification contact signal sampling unit 6 and the smart control unit 7 are provided together. The pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are connected to the smart control unit 7.

[0148] Moreover, the pressure adjustment mechanism 5 of this embodiment is mainly composed of a piston 51 and a driving member 52. One end of the piston 51 is sealed and connected to the gas density relay body 1 to form a securely sealed gas chamber. In the pressure adjustment mechanism 5, the driving member 52 pushes the piston 51 to change the volume of the sealed gas chamber according to the control of the smart control unit 7, and further completes the rise and fall of the pressure. The driving member 52 is disposed outside the sealed gas chamber, and the piston 51 is disposed inside the sealed gas chamber, and the driving member 52 applies an electromagnetic force to move the piston 51. That is, between the piston 51 and the driving member 52, the piston 51 is moved by a magnetic force.

[0149] Example 12 12, the gas density relay or gas density monitor of this embodiment has a gas refill port 10 and a multi-contact 9 in addition to the configuration of the gas density relay or gas density monitor of the 11th embodiment. The valve 4 is a port that communicates with an electrical equipment and communicates with a first port of the multi-contact 9; the gas density relay body 1 communicates with the multi-contact 9 through the valve 4; the second port of the multi-contact 9 is used for connecting to an electrical equipment. The gas refill port 10 and the temperature sensor 3 are also installed in the multi-contact 9.

[0150] Example 13 The gas density relay or monitoring device of this embodiment adds a multi-contact 9. As shown in Fig. 13, the gas density relay or monitoring device with online self-verification function 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, a multi-contact 9, and a gas refill port 10. The gas density relay 1, the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the gas refill port 10 are installed in the multi-contact 9. Specifically, the inlet of the valve 4 is provided with an interface communicating with the electrical equipment, the inlet is sealed connected to the electrical equipment and communicates with the gas chamber of the electrical equipment, and the outlet of the valve 4 is connected to the gas density relay 1 by a multi-contact 9; the pressure sensor 2 is connected to the gas density relay body 1 through a gas path by the multi-contact 9; the pressure regulating mechanism 5 is connected to the gas density relay 1 by the multi-contact 9; the online verification contact signal sampling unit 6 is respectively connected to the gas density relay 1 and the smart control unit 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 are respectively connected to the smart control unit 7; the gas replenishment interface 10 is connected to the multi-contact 9.

[0151] Example 14 The gas density relay or monitoring device of this embodiment adds a multi-contact 9. As shown in FIG. 14, a gas density relay or monitoring device with online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, a smart control unit 7, and a multi-contact 9. The inlet of the valve 4 is sealedly connected to an equipment connection joint, and the outlet of the valve 4 is connected to the multi-contact 9. The gas density relay body 1 is attached to the multi-contact 9; the pressure sensor 2 is attached to the multi-contact 9, and the pressure sensor 2 is connected to the pressure detector of the gas density relay body 1 in a gas path; the pressure adjustment mechanism 5 is attached to the multi-contact 9, and the pressure adjustment mechanism 5 is connected to the pressure detector of the gas density relay body 1; the temperature sensor 3, the online verification contact signal sampling unit 6 and the smart control unit 7 are installed together and installed on the multi-contact 9; 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.

[0152] The pressure adjustment mechanism 5 in this embodiment is mainly composed of a bellows 54 and a driving member 52. The bellows 54 is sealed and connected to the pressure detector of the gas density relay body 1 to form a securely sealed gas chamber. The pressure adjustment mechanism 5 is controlled by the smart control unit 7, and the driving member 52 pushes the bellows 54 to change the volume, thereby changing the volume of the sealed gas chamber and completing the increase and decrease of pressure. The pressure adjustment mechanism 5 adjusts the pressure so that the gas density relay body 1 generates a contact operation, and the contact operation is transmitted to the smart control unit 7 through the online verification contact signal sampling means 6. The smart control unit 7 converts the pressure value and temperature value at the time of the contact operation of the gas density relay 1 into the corresponding density value, detects the alarm and / or latch contact operation value and / or return value of the gas density relay body 1, and completes the verification operation of the gas density relay body 1.

[0153] Example 15 The gas density relay or monitoring device of this embodiment adds a multi-contact 9. As shown in FIG. 15, a gas density relay or gas density monitoring device with an online self-verification function includes a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjustment mechanism 5, an online verification contact signal sampling unit 6, a smart control unit 7, and a multi-contact 9. The inlet of the valve 4 is sealed and connected to an electric equipment, and the outlet of the valve 4 is connected to the multi-contact 9. The valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is drawn out through a first lead-out seal 42 sealed in the first housing 41, thus designed to maintain the sealing of the valve 4 and ensure reliable operation for a long time. The gas density relay body 1 is attached to the multi-contact 9, and the pressure adjustment mechanism 5 is attached to the multi-contact 9. The pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6, and the smart control unit 7 are provided in the gas density relay body 1. The pressure sensor 2 and the gas density relay main body 1 are in communication with a pressure adjustment mechanism 5 via a gas path. The valve 4, the pressure adjustment mechanism 5, the pressure sensor 2, and the temperature sensor 3 are each connected to a smart control unit 7.

[0154] The pressure adjustment mechanism 5 of this embodiment is mainly composed of a gas chamber 57, a heating element 58, and a heat retaining member 59. A heating element 58 is provided outside (or may be inside) the gas chamber 57, and the heating element 58 heats the gas chamber 57 to change the temperature, and further increases or decreases the pressure. By adjusting the pressure with the pressure adjustment mechanism 5, a contact operation occurs in the gas density relay main body 1, and the contact operation is transmitted to the smart control unit 7 via the online verification contact signal sampling means 6. The smart control unit 7 converts the pressure value and temperature value at the time of contact operation of the gas density relay main body 1 into a corresponding density value, detects the alarm and / or latch contact operation value and / or return value of the gas density relay, and completes the verification operation of the gas density relay.

[0155] The working principle of this embodiment is as follows: When the gas density relay needs to be verified, the smart control unit 7 controls the heating element 58 of the pressure regulating mechanism 5 to perform heating, and after the temperature difference between the temperature value in the pressure regulating mechanism 5 and the temperature value of the temperature sensor 3 reaches a set value, the smart control unit 7 can close the valve 4 to isolate the gas density relay from the electrical equipment in the gas path; then, the heating element 58 of the pressure regulating mechanism 5 is immediately cut off to stop the heating of the heating element 58, and the gas pressure in the sealed gas chamber 57 of the pressure regulating mechanism 5 is gradually reduced, respectively operating the contacts that generate alarm and / or latch in the gas density relay body 1, and the contact operation is transmitted to the smart control unit 7 by verifying the online contact signal sampling unit 6, and the smart control unit 7 detects the alarm and / or latch contact operation value and / or return value of the gas density relay according to the density value at the time of the alarm and / or latch contact operation, thereby completing the verification operation of the gas density relay.

[0156] The mounting position of the multi-contact 9 can be flexibly set according to need. For example, the gas path of the pressure adjustment mechanism 5 communicates with the gas density relay body 1 through a first connection duct; the first port of the multi-contact 9 communicates with the portion of the first connection duct between the gas density relay body 1 and the pressure adjustment mechanism 5. The valve 4 communicates with the second port of the multi-contact 9 and communicates with the gas density relay body 1 through the multi-contact 9. In addition, if the gas density relay or monitoring device includes a micro water sensor, the micro water sensor may be installed in the multi-contact 9; if the gas density relay or monitoring device includes a decomposition product sensor, the decomposition product sensor may be installed in the multi-contact 9; if the gas density relay or monitoring device includes a gas refill port, the gas refill port may be installed in the multi-contact 9, and they will not be listed here one by one.

[0157] Example 16 As shown in Fig. 16, the smart control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), a smart control unit protection circuit 74 (U4), a display output operation unit 75 (U5), a data storage unit 76 (U6), etc. The processor 71 (U1) includes a crystal oscillator and a filter circuit. The smart cell protection circuit 74 (U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, etc. The power supply is two-stage and further includes a step-down module.

[0158] Here, the communication module 73 (U3) may be an industrial bus such as RS232, RS485, CAN-BUS, or a wired communication such as optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, or a wireless communication such as 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound, satellite, light wave, quantum communication, acoustic, etc. The display output unit 75 (U5) may be a digital tube, LED, LCD, HMI, display, matrix screen, printer, fax machine, projector, mobile phone, etc., or may be flexibly combined with one or more types. The data storage unit 76 (U6) may be FLASH (registered trademark), RAM, ROM, hard disk, flash memory card such as SD, magnetic tape, punched paper tape, optical disk, U disk, disk, film, etc., or may be flexibly combined with one or more types.

[0159] Example 17 As shown in FIG. 17, the smart control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), and a smart control unit protection circuit 74 (U4). The processor 71 (U1) includes a crystal oscillator and a filter circuit. The smart cell protection circuit 74 (U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply is two-stage and further includes a step-down module. The pressure sensor 2 passes through an overvoltage protection circuit and an operational amplifier circuit to a modulation circuit, and then through a filter circuit to the processor 71 (U1). The communication module 73 (U3) passes through a communication chip to a communication interface via a surge protection circuit.

[0160] Example 18 As shown in FIG. 18, the 4-20Ma type density transmitter mainly consists of a microprocessor (including a master controller, a crystal oscillator, and a filter circuit), a power supply, a modulation circuit, a current loop, a protection circuit, an analog pressure sensor, an operational amplifier, a temperature sensor, a proportional modulation module, a step-down module, etc. The microprocessor includes a crystal oscillator and a filtering circuit. The protection circuit includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, etc. The analog pressure sensor passes through an overvoltage protection circuit and an operational amplifier circuit to reach the modulation circuit, and then passes through a filter circuit to reach the microprocessor. In this way, the microprocessor can collect the pressure value and the temperature value, and the microprocessor calculates and converts them to obtain a density value signal. The density value signal passes through a proportional modulation module, a modulation circuit, and a current loop to obtain a density value of 4-20Ma.

[0161] In short, the analog pressure sensor, temperature sensor, and micro water sensor pass through the amplification circuit, then A / D conversion, and then to the MCU to realize the collection of pressure, temperature, and moisture. The smart control unit 7 can include or connect to a printer, LCD display, and can also realize USB storage and RS232 communication.

[0162] Example 19 In this embodiment, the gas density relay or monitor with online self-verification function further includes a background monitoring terminal which realizes remote communication with the gas density relay or monitor through communication facilities.

[0163] As shown in FIG. 19, a plurality of high-voltage electrical equipments in which sulfur hexafluoride gas chambers are provided, and a plurality of gas density relays or monitoring devices are all sequentially connected to the background monitoring terminal via a hub and an IEC61850 protocol converter. Here, each of the gas density relays or monitoring devices is installed in the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. In this embodiment, the background monitoring terminal PC communicates with a plurality of hubs HUB (HUB1, HUB2, . . . HUBm) via the hub HUB0. Each of the hubs HUB is connected to a set of gas density relays or monitoring devices. For example, the hub HUB1 is connected to gas density relays (or monitoring devices) Z11, Z12, . . . Z1n, the hub HUB2 is connected to gas density relays (or monitoring devices) Z21, Z22, . . . Z2n, . . ., and the hub HUBm is connected to gas density relays (or monitoring devices) Zm1, Zm2, . . . Zmn (where m and n are both natural numbers).

[0164] The background monitoring terminal includes: 1) background software platform such as Windows, Linux, and others, or based on VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS; 2) important business modules of background software: such as authority management, equipment management, data storage investigation, 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.

[0165] Example 20 In this embodiment, compared with the 19th embodiment, a network switch Gateway, an integrated application server Server, and a contract converter / online monitoring smart control unit ProC are added. In this embodiment, the background monitoring terminal PC is connected to two integrated application servers Server1 and Server2 by the network switch Gateway, and the two integrated application servers Server1 and Server2 communicate with a plurality of contract converter / online monitoring smart control units ProC (ProC1, ProC2, ... ProCn) by the station control layer A net and B net. Each of the hubs HUB is connected to a set of gas density relays or monitoring devices. For example, the hub HUB1 is connected to gas density relays (or monitoring devices) Z11, Z12, ... Z1n, the hub HUB2 is connected to gas density relays (or monitoring devices) Z21, Z22, ... Z2n, ..., and the hub HUBm is connected to gas density relays (or monitoring devices) Zm1, Zm2, ... Zmn (where m and n are both natural numbers).

[0166] Example 21 This embodiment is a schematic diagram of the architecture of a wireless transmission method, and the dotted frame in the figure indicates that the wireless module Wn and the gas density relay (or monitoring device) Zn can be integrated or separate, and the specific solution is flexible.

[0167] A plurality of integrated application servers Server1, Server2, ...Servern wirelessly communicate with each gas density relay (or monitoring device) via a cloud terminal Cloud, a wireless gateway, and a wireless module of each gas density relay (or monitoring device), where n is a natural number.

[0168] In the above, a gas density relay having the online self-verification function generally refers to a device whose components are designed as an integrated structure, while a gas density monitoring device generally refers to a device whose components are designed as separate structures and are flexibly configured.

[0169] As described above, the present disclosure provides a gas density relay having an online self-verification function and a verification method thereof, which is composed of a gas path (which may be a pipe) connection part, a pressure adjustment part, a signal measurement control part, etc., and its main function is to perform online verification measurement on the contact signal (pressure value at the time of alarm / latch operation) of the gas density relay at the ambient temperature, and automatically convert it to the corresponding pressure value at 20°C, thereby realizing online performance detection for the contact (alarm and latch) value of the gas density relay. The mounting positions of the gas density relay, pressure sensor, temperature sensor, pressure adjustment mechanism, valve, online contact signal sampling unit, and smart control unit can be flexibly combined. For example, the gas density relay main body, pressure sensor, temperature sensor, online verification contact signal sampling unit, and smart control unit may be combined and designed as an integrated unit, or may be designed separately; they may be attached to a housing, may be attached to a multi-contact, or may be connected through a connection duct. The valve may be directly connected to the electrical equipment, or may be connected through a self-sealing valve or a gas duct. The pressure sensor, the temperature sensor, the online verification contact signal sampling unit, and the smart control unit can be combined and designed into an integrated unit; the pressure sensor, the temperature sensor can be combined and designed into an integrated unit; the online verification contact signal sampling unit and the smart control unit can be combined and designed into an integrated unit. In short, the structure is not important.

[0170] A gas density relay or monitoring device with online self-verification function has different requirements for error judgment when verifying the density relay contact at high, low, normal, and 20℃ environmental temperatures. Specifically, it can be implemented according to the relevant standards according to the temperature requirements; the density relay can compare its error performance at different temperatures and different time periods. That is, the performance of the density relay is judged by comparing it at different times and within the same temperature range. There are individual time periods in the history, and a comparison between the history and the present. In addition, the density relay body can be health-checked. If necessary, the density relay contact signal can be verified at any time; the density value of the gas density relay body and the monitored electrical equipment can be judged to be normal or not. That is, the density value of the electrical equipment itself, the gas density relay body, the pressure sensor, and the temperature sensor can be judged, analyzed, and compared to be normal and abnormal, and the gas density monitoring of the electrical equipment, the judgment, comparison, and analysis of the status of the density relay body, etc. can be realized; and the contact signal status of the gas density relay can be monitored and the status can be remotely transmitted. It is possible to know whether the contact signal state of the gas density relay is off or on in the background, thereby further monitoring and improving reliability; it is also possible to detect or detect and judge the temperature compensation performance of the gas density relay body; it is also possible to detect or detect and judge the contact resistance of the gas density relay body; it is also possible to detect or detect and judge the insulation performance of the gas density relay body. [Industrial Applicability]

[0171] The structure of the present application has a compact and reasonable layout, each component has good anti-rust and anti-vibration capabilities, is firmly installed, and is highly reliable in use. The gas density relay is easy to connect and disconnect, and the equipment and components can be easily maintained. The present application can complete the gas density relay verification work without the need for maintenance personnel to go to the site, greatly improving the reliability of the power grid, improving work efficiency, and reducing the cost of operation and maintenance.

[0172] 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]

[0173] 1 Gas Density Relay Body 2. Pressure Sensor 3 Temperature Sensor 4 Valve 5. Pressure adjustment mechanism 6 Online verification contact signal sampling unit 7 Smart Control Unit 9 Multi-Contact 10 Gas refill port 11 Self-sealing valve 21 First pressure sensor 22 Second pressure sensor 31 First temperature sensor 32 Second Temperature Sensor 41 First Housing 42 First leader seal 51 Piston 52 Driving member 53 Airbag 54 Bellows 55 Second Housing 56 Second lead line seal 57 Gas Chamber 58 Heating element 59 Thermal insulation materials 71 Processor 72 Power supply 73 Communication Module 74 Smart Control Unit Protection Circuit 75 Display output section 76 Data Storage Unit 101 Housing 102 Base 103 Pressure detector 104 Temperature compensation element 105 Movement 106 Guidelines 107 Dial 108 End Base 109 Signal Generator 1010 Electrical equipment connection joints

Claims

1. 1. A gas density relay with online self-verification capability, comprising: A gas density relay body; a gas density detection sensor communicating with the gas density relay body; a pressure adjustment mechanism, a gas path of the pressure adjustment mechanism being in communication with a gas density relay body, the pressure adjustment mechanism being arranged to adjust the rise and fall of pressure in the gas density relay body and generate a contact signal operation in the gas density relay body; a valve having an interface at one end communicating with an electrical device and the other end communicating with the gas density relay body or connected to a gas path of the pressure adjustment mechanism, thereby communicating with the gas density relay body; an online verification contact signal sampling unit connected to the gas density relay body, configured to sample a contact signal of the gas density relay body at an ambient temperature; a smart control unit respectively connected to the gas density detection sensor, the pressure regulating mechanism, the valve and the online verification contact signal sampling unit, and configured to control the pressure regulating mechanism, collect pressure values ​​and temperature values, and / or collect gas density values, and control the latching or opening of the valve to detect the contact signal operating value and / or contact signal return value of the gas density relay body; Including, the contacts of the gas density relay are normally open type gas density relays, and the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contacts of the gas density relay and a contact signal control circuit, and the second connection circuit is connected to the contacts of the gas density relay and the smart control unit; in a non-verification state, the second connection circuit is disconnected or isolated, and the first connection circuit is closed; in a verification state, the online verification contact signal sampling unit disconnects the first connection circuit, communicates with the second connection circuit, and connects the contacts of the gas density relay to the smart control unit, or the contacts of the gas density relay are normally closed type gas density relays, and the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contacts of the gas density relay and a contact signal control circuit, and the second connection circuit is connected to the contacts of the gas density relay and the smart control unit; in a non-verification state, the second connection circuit is disconnected or isolated, and the first connection circuit is closed; in a verification state, the online verification contact signal sampling unit closes the contact signal control circuit to disconnect the connection between the contacts of the gas density relay and the contact signal control circuit, communicates with the second connection circuit, and connects the contacts of the gas density relay to the smart control unit; In the verify state, the valve is closed by the smart control unit, and the gas density relay body is disconnected from the electrical equipment in the gas path; The contact signal includes an alarm and / or a latch.

1. A gas density relay having an online self-verification function.

2. The gas density relay body includes a housing and a base disposed within the housing, a pressure detector, a temperature compensation element, and a plurality of signal generators; the signal generator comprises a microswitch or a magnetically assisted electrical contact; The gas density relay body outputs a contact signal via the signal generator, The pressure detector includes a Bourdon tube or a corrugated tube, The temperature compensation element uses a gas sealed within a temperature compensation sheet or housing.

2. The gas density relay with on-line self-verification as claimed in claim 1.

3. a gas path of the pressure adjustment mechanism communicates with the pressure detector; the other end of the valve is connected to the base and the pressure detector, or the other end of the valve is connected to a gas path of the pressure adjustment mechanism, thereby connecting the valve to the base and the pressure detector; The online verification contact signal sampling unit is connected to the signal generator; 3. The gas density relay with on-line self-verification as claimed in claim 2.

4. The gas density detection sensor is installed in the gas density relay body; or the pressure regulating mechanism is installed in the gas density relay body; or the gas density detection sensor, the online verification contact signal sampling unit and the smart control unit are installed in the gas density relay body; or the pressure regulating mechanism, the gas density detection sensor, the online verification contact signal sampling unit and the smart control unit are installed in the gas density relay body.

2. The gas density relay with on-line self-verification as claimed in claim 1.

5. The gas density detection sensor includes at least one pressure sensor installed in a gas path of the gas density relay body, and at least one temperature sensor installed in the gas path of the gas density relay body or outside the gas path, or inside the gas density relay body, or outside the gas density relay body; Alternatively, the gas density detection sensor is a gas density transmitter including a pressure sensor and a temperature sensor, Alternatively, the gas density detection sensor is a density detection sensor using quartz tuning fork technology.

2. The gas density relay with on-line self-verification as claimed in claim 1.

6. The pressure adjustment mechanism is a sealed gas chamber with an external or internal heating element and / or cooling element, which is heated by the heating element and / or cooled by the cooling element during verification to change the temperature of the gas in the sealed gas chamber, and further completes the increase and decrease of the pressure of the gas density relay; or the pressure adjustment mechanism is a cavity with an open end, the other end of the cavity is connected to the gas density relay body, a piston is disposed within the cavity, an adjustment rod is connected to one end of the piston, the outer end of the adjustment rod is connected to a drive member, the other end of the piston protrudes into the opening and is in sealing contact with an inner wall of the cavity, the drive member drives the adjustment rod to move the piston within the cavity, or the pressure adjustment mechanism is a sealed gas chamber with a piston disposed therein, the piston being in sealing contact with an inner wall of the sealed gas chamber, and a driving member being disposed on an outer surface of the sealed gas chamber, the driving member moving the piston within the cavity by electromagnetic force, or The pressure adjustment mechanism is an airbag having one end connected to a drive member, a volume of which changes when the drive member is driven, and which communicates with the gas density relay body, or The pressure adjustment mechanism is a bellows having one end communicating with the gas density relay body and the other end expanding and contracting in response to the driving of a driving member, or The pressure regulating mechanism is a purge valve which is a solenoid valve or an electric valve; or the pressure regulation mechanism is a compressor, or The pressure adjustment mechanism is a pump including any one of a pressure-building pump, a booster pump, an electric air pump, and an electromagnetic air pump, The driving member is one of a magnetic force, an electric motor, a reciprocating mechanism, a Carnot circulation mechanism, and a pneumatic element.

2. The gas density relay with on-line self-verification as claimed in claim 1.

7. the smart control unit calculates the gas density value using an average method; The average value method is to set a collection frequency at a set time interval, and average all collected N gas density values ​​at different times to obtain the gas density value; or At a set time interval, set a temperature interval step, and average the density values ​​corresponding to N different temperature values ​​collected over the entire temperature range to obtain the gas density value; or At a set time interval, a pressure interval step is set, and an average value calculation process is performed on density values ​​corresponding to the N different pressure values ​​collected within all pressure change ranges to obtain a gas density value; Here, N is a positive integer equal to or greater than 1.

2. The gas density relay with on-line self-verification as claimed in claim 1.

8. Under normal operating conditions, the gas density relay monitors the gas density value in the electrical equipment, and the gas density relay online monitors the gas density value in the electrical equipment through the gas density detection sensor and the smart control unit; The gas density relay shall, depending on the configured verification time and gas density value situation, in the circumstances where the verification of the gas density relay is permitted: The smart control unit closes the valve, Adjust the online verification contact signal sampling unit to a verification state by the smart control unit, and in the verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay body and connects the contact of the gas density relay body to the smart control unit; The smart control unit drives the pressure regulating mechanism to slowly reduce the gas pressure, causing the gas density relay body to make a contact operation, and the contact operation is transmitted to the smart control unit by the online contact signal sampling unit, and the smart control unit obtains the gas density value according to the pressure value and temperature value during the contact operation, or directly obtains the gas density value, detects the contact signal operation value of the gas density relay body, and completes the verification operation of the contact signal operation value of the gas density relay; The smart control unit drives the pressure regulating mechanism to slowly increase the gas pressure, causing the gas density relay body to reset the contacts, and the contact reset is transmitted to the smart control unit by the online contact signal sampling unit, and the smart control unit obtains the gas density value according to the pressure value and temperature value at the time of the contact reset, or directly obtains the gas density value, detects the return value of the contact signal of the gas density relay body, and completes the verification operation of the return value of the contact signal of the gas density relay; After all the contact signal verification operations are completed, the smart control unit opens the valve, and adjusts the online verification contact signal sampling unit to the working state, and the contact signal control circuit of the gas density relay body returns to the normal working state.

2. The method of claim 1, wherein the gas density relay is a gas density relay.

9. A gas density detection sensor is connected to the gas density relay body, connecting a gas path of the gas density relay body to a first port of a multi-contact; a gas path of a pressure adjustment mechanism is connected to a second port of the multi-contact, and the first port is in communication with the second port, thereby communicating the gas path of the pressure adjustment mechanism with the gas density relay body, and the pressure adjustment mechanism adjusts and raises and lowers the pressure of the gas density relay body to generate a contact signal operation in the gas density relay body; An online verification contact signal sampling unit is directly or indirectly connected to the gas density relay body, and the online verification contact signal sampling unit samples the contact signal of the gas density relay body at an ambient temperature; A smart control unit is respectively connected to the gas density detection sensor, the pressure regulating mechanism and the online verification contact signal sampling unit, and completes the control of the pressure regulating mechanism, the collection of pressure value and temperature value, and / or the collection of gas density value, and detects the contact signal operating value and / or the contact signal return value of the gas density relay body; The contact signal includes an alarm and / or a latch.

2. The method for modifying a gas density relay according to claim 1.

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