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

Abstract

The present application provides a gas density relay with an online self-checking function and a check method thereof, including a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting component, an online check contact signal sampling unit and an intelligent control unit. During the check, the gas flow flowing to the gas density relay body through the gas flow limiting component is not enough to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, causing the gas density relay body to have a contact action, and the contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the contact signal action value and / or return value of the gas density relay body according to the density value when the contact is in action. The online check can be completed without the need for a control valve or maintenance personnel to go to the site, thus achieving maintenance-free, improving the reliability of the power grid and reducing costs.

Description

Technical Field

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

[0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in power departments and industrial and mining enterprises, promoting the rapid development of the power industry. In recent years, the capacity of my country's power system has expanded dramatically, and the use of SF6 electrical equipment has increased. The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment is reduced and the micro-water content exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment. Therefore, the power grid operation regulations stipulate that the density and water content of SF6 gas must be regularly tested before the equipment is put into operation and during operation.

[0003] As unmanned substations develop towards networking and digitalization, and the requirements for remote control and telemetry continue to increase, online monitoring of the gas density and micro-water content of SF6 electrical equipment has important practical significance. With the continuous and vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a vital role in the safety of smart grids. Most high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as leakage), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, online monitoring of the gas density value in SF6 high-voltage electrical equipment is very common, so the application of gas density monitoring system (gas density relay) will flourish. At the same time, the monitoring system is also equipped with a safe and reliable circuit transmission function, which establishes an effective platform for realizing real-time data remote data reading and information monitoring, and can transmit information such as pressure, temperature, density, etc. to the target equipment (such as computer terminals) in a timely manner to realize online monitoring.

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

[0005] The object of the present invention is to provide a gas density relay with an online self-calibration function and a calibration method thereof, so as to solve the problems raised in the above technical background.

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

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

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

[0009] The online verification contact signal sampling unit is connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body;

[0010] The gas path of the pressure regulating mechanism is connected to the gas density relay body; the pressure regulating mechanism is configured to adjust the pressure rise and fall of the gas density relay body so that the gas density relay body generates a contact signal action;

[0011] The gas flow limiting component has an interface connected to the electrical equipment at one end, and the other end is connected to the gas path of the gas density relay body, or the other end of the gas flow limiting component is connected to the gas path of the pressure regulating mechanism, so that the gas flow limiting component is connected to the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting component is not sufficient to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;

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

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

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

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

[0016] The online verification contact signal sampling unit is connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body;

[0017] The gas path of the pressure regulating mechanism is connected to the gas density relay body; the pressure regulating mechanism is configured to adjust the pressure rise and fall of the gas density relay body so that the gas density relay body generates a contact signal action;

[0018] The gas flow limiting component has an interface connected to the electrical equipment at one end, and the other end is connected to the gas path of the gas density relay body, or the other end of the gas flow limiting component is connected to the gas path of the pressure regulating mechanism, so that the gas flow limiting component is connected to the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting component is not sufficient to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;

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

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

[0021] Preferably, at the same time, the gas flow rate of the gas flow limiting member flowing to the gas density relay body is Q1, and the gas flow rate flowing out or / and diffusing to the pressure regulating mechanism caused by the pressure drop of the gas density relay body being adjusted by the pressure regulating mechanism is Q2, Q2>Q1, and Q2 / Q1 is the set value.

[0022] Preferably, the intelligent control unit adjusts the adjustment speed of the pressure adjustment mechanism according to the gas flow rate and / or gas pressure of the gas flow limiting member; or,

[0023] The intelligent control unit adjusts the adjustment speed of the pressure regulating mechanism according to the gas flow rate and / or gas pressure of the gas flow limiting member and / or the adjustment flow rate of the pressure regulating mechanism.

[0024] Preferably, the intelligent control unit automatically matches the adjustment speed of the pressure regulating mechanism according to the gas pressure of the gas flow limiting member during calibration. Specifically, when the gas pressure of the gas flow limiting member is low, the adjustment speed of the pressure regulating mechanism is slow; and when the gas pressure is high, the adjustment speed of the pressure regulating mechanism is fast.

[0025] Preferably, according to the flow rate of the gas flow limiting component, the pressure regulating mechanism slowly increases or decreases the load when increasing or decreasing the pressure of the gas density relay body; when measuring the contact signal action value of the gas density relay body, the load change rate is no more than 15‰ of the range per second when approaching the action value, that is, the pressure can rise or fall smoothly.

[0026] Preferably, the gas flow limiting element is a capillary tube, and / or a gas flow controller, or a microporous element, or a molecular sieve.

[0027] Preferably, the gas flow limiting member is arranged on the gas density relay body, or on the pressure regulating mechanism.

[0028] Preferably, the gas density relay or gas density monitoring device also includes an inertia gas chamber, which is a sealed gas chamber, connected to the gas path of the gas density relay body through a first air passage, connected to the gas path of the pressure regulating mechanism through a second air passage, and also connected to the other end of the gas flow limiting member; the inertia gas chamber is configured to control the load change speed during gas pressure regulation.

[0029] More preferably, the air chamber volume of the inertia air chamber is much larger than the sum of the volumes of the air passages in other parts.

[0030] More preferably, the aperture of the gas flow limiting member is smaller than the aperture of the first gas channel, and the aperture of the first gas channel is smaller than the aperture of the second gas channel.

[0031] More preferably, the inertial air chamber is made of metal material or non-metal material with good sealing performance.

[0032] More preferably, the gas circuit of the pressure regulating mechanism is also sealed and connected to one end of the third air channel through a one-way valve, and the other end of the third air channel is provided with an interface for connecting the electrical equipment, and the one-way valve is used to control the gas flow of the pressure regulating mechanism to the electrical equipment.

[0033] Furthermore, the airway aperture of the gas flow limiting component is smaller than the aperture of the first airway, and the aperture of the first airway is smaller than the aperture of the third airway.

[0034] Preferably, the gas density relay body comprises: a shell, and a base, a pressure detector, a temperature compensation element, and a plurality of signal generators arranged in the shell; wherein the signal generator comprises a micro switch or a magnetically assisted electric contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a Baden tube or a bellows; and the temperature compensation element adopts a temperature compensation sheet or a gas enclosed in the shell.

[0035] More preferably, the gas circuit of the pressure regulating mechanism is connected to the pressure detector; the other end of the gas flow limiting component is connected to the base and the pressure detector, or the other end of the gas flow limiting component is connected to the base and the pressure detector by connecting to the gas circuit of the pressure regulating mechanism; the online verification contact signal sampling unit is connected to the signal generator.

[0036] More preferably, at least one of the temperature sensors is arranged near the temperature compensation element of the gas density relay body, or arranged on the temperature compensation element, or integrated into the temperature compensation element. Preferably, at least one of the temperature sensors is arranged at one end of the pressure detector of the gas density relay body close to the temperature compensation element.

[0037] More preferably, the gas density relay body also includes a display mechanism, which includes a movement, a pointer, and a dial, and the movement is fixed on the base or in the shell; one end of the temperature compensation element is also connected to the movement through a connecting rod or directly connected to the movement; the pointer is installed on the movement and arranged in front of the dial, and the pointer displays the gas density value in combination with the dial; and / or the display mechanism includes a digital device or a liquid crystal device with a value display.

[0038] More preferably, the gas density relay body or the gas density monitoring device also includes a contact resistance detection unit; the contact resistance detection unit is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay body is isolated from its control circuit, and when the contact signal is actuated and / or when an instruction to detect the contact resistance of the contact is received, the contact resistance detection unit can detect the contact resistance value of the gas density relay body.

[0039] More preferably, the gas density relay body or the gas density monitoring device also includes an insulation resistance detection unit; the insulation resistance detection unit is connected to the contact signal or directly connected to the signal generator; under the control of the online verification contact signal sampling unit, the contact signal of the gas density relay is isolated from its control circuit, and when the contact signal of the gas density relay is actuated, and / or when an instruction to detect the contact insulation resistance is received, the insulation resistance detection unit can detect the contact insulation resistance value of the gas density relay.

[0040] Preferably, the gas density detection sensor is arranged on the gas density relay body; or, the pressure regulating mechanism is arranged on the gas density relay body; or,

[0041] The gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

[0042] The pressure regulating mechanism, the gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body.

[0043] More preferably, the gas density relay body and the gas density detection sensor are an integrated structure; or, the gas density relay body and the gas density detection sensor are a remote gas density relay with an integrated structure.

[0044] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or,

[0045] Use a gas density transmitter consisting of a pressure sensor and a temperature sensor; or,

[0046] Density sensor using quartz tuning fork technology.

[0047] Preferably, the pressure regulating mechanism is an air chamber, and a heating element and / or a cooling element are provided outside or inside the air chamber. By heating the heating element and / or cooling the cooling element, the temperature of the gas in the air chamber changes, thereby completing the pressure rise and fall of the gas density relay; or,

[0048] The pressure regulating mechanism is a cavity with an opening at one end, and the other end of the cavity is connected to the gas density relay body; there is a piston in the cavity, one end of the piston is connected to an adjusting rod, the outer end of the adjusting rod is connected to a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod and then drives the piston to move in the cavity; or,

[0049] The pressure regulating mechanism is an air chamber, a piston is provided inside the air chamber, the piston is in sealing contact with the inner wall of the air chamber, a driving component is provided outside the air chamber, and the driving component drives the piston to move in the cavity through electromagnetic force; or,

[0050] The pressure regulating mechanism is an airbag with one end connected to a driving component, the airbag changes volume under the driving of the driving component, and the airbag is connected to the gas density relay body; or,

[0051] The pressure regulating mechanism is a bellows, one end of which is connected to the gas density relay body, and the other end of which is driven by a driving component to expand and contract; or

[0052] The pressure regulating mechanism is a bleed valve, which is a solenoid valve or an electric valve, or other bleed valves realized by electrical or pneumatic means; or,

[0053] The pressure regulating mechanism is a compressor; or,

[0054] The pressure regulating mechanism is a pump, which includes, but is not limited to, a pressure pump, a booster pump, an electric air pump, and an electromagnetic air pump; or

[0055] The pressure regulating mechanism is a boost valve;

[0056] Among them, the driving components include but are not limited to one of magnetism, motor, reciprocating motion mechanism, Carnot cycle mechanism, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, chemical reaction thrust mechanism, and pneumatic elements.

[0057] More preferably, the pressure regulating mechanism further comprises a heat-insulating component, and the heat-insulating component is arranged outside the air chamber.

[0058] Preferably, the online verification contact signal sampling unit includes an isolation sampling element, which is controlled by the gas density relay body, or the gas path isolation pressure regulating mechanism, or the intelligent control unit; in the non-verification state, the online verification contact signal sampling unit is relatively isolated from the contacts of the gas density relay body in the circuit through the isolation sampling element; in the verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay body through the isolation sampling element, and connects the contacts of the gas density relay body with the intelligent control unit; preferably, the isolation sampling element includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optocoupler, and a thyristor.

[0059] Preferably, the contact signal sampling of the gas density relay body by the online verification contact signal sampling unit satisfies the following conditions: the online verification contact signal sampling unit has at least two independent groups of sampling contacts, and can automatically complete the verification of at least two contacts at the same time, and continuously measure without changing contacts or reselecting contacts; wherein,

[0060] The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a locking contact, an alarm contact + a locking 1 contact + a locking 2 contact, and an alarm contact + a locking contact + an overpressure contact.

[0061] Preferably, the test voltage of the online verification contact signal sampling unit for the contact signal action value or the switching value of the gas density relay body is not less than 24V, that is, during verification, a voltage of not less than 24V is applied between the corresponding terminals of the contact signal.

[0062] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay or gas density monitoring device.

[0063] More preferably, the intelligent control unit adopts the mean method (average value method) to calculate the gas density value, and the mean method is: within a set time interval, set the collection frequency, and perform average calculation processing on all N gas density values ​​collected at different time points to obtain its gas density value; or, within a set time interval, set the temperature interval step, perform average calculation processing on the density values ​​corresponding to N different temperature values ​​collected within the entire temperature range to obtain its gas density value; or, within a set time interval, set the pressure interval step, perform average calculation processing on the density values ​​corresponding to N different pressure values ​​collected within the entire pressure change range to obtain its gas density value; wherein N is a positive integer greater than or equal to 1.

[0064] Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and completes the online verification of the gas density relay or the gas density monitoring device; or,

[0065] The intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor when the contact signal of the gas density relay body is actuated or switched, and converts it into a pressure value corresponding to 20°C, that is, the gas density value, according to the gas pressure-temperature characteristics, to complete the online calibration of the gas density relay or gas density monitoring device.

[0066] Preferably, the gas density relay body has a density comparison value output signal, and the density comparison value output signal is connected to the intelligent control unit; or,

[0067] The gas density relay body is provided with a comparative pressure value output signal, and the comparative pressure value output signal is connected to the intelligent control unit.

[0068] Preferably, the gas density relay or the gas density monitoring device further comprises: a multi-way connector, on which the gas density relay body, the gas flow limiting element and the pressure regulating mechanism are arranged; or,

[0069] The gas flow limiting element and the pressure regulating mechanism are arranged on the multi-way connector; or,

[0070] The gas density relay body, the gas density detection sensor, the gas flow limiting component, and the pressure regulating mechanism are arranged on the multi-way connector.

[0071] More preferably, the gas density relay or gas density monitoring device further comprises: a self-sealing valve, which is installed between the multi-way connector and the gas flow limiting component; or, the gas flow limiting component is installed between the multi-way connector and the self-sealing valve.

[0072] Furthermore, the gas density relay or gas density monitoring device also includes: a gas supply interface, which is arranged on the pressure regulating mechanism; or, the gas supply interface is arranged on the electrical equipment; or, the gas supply interface is arranged on the multi-way connector; or, the gas supply interface is arranged on the gas flow limiting component.

[0073] Preferably, the gas density relay or gas density monitoring device also includes: a temperature regulating mechanism, which is a temperature-adjustable regulating mechanism, configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body, and then cooperate with or / and combine with the gas path isolation pressure regulating mechanism to cause the gas density relay body to generate a contact signal action; the intelligent control unit is connected to the temperature regulating mechanism to complete the control of the temperature regulating mechanism.

[0074] More preferably, the temperature regulating mechanism is a heating element; or,

[0075] The temperature regulating mechanism includes a heating element, a heat preservation member, a temperature controller, a temperature detector, and a temperature regulating mechanism housing; or,

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

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

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

[0079] The temperature adjustment mechanism includes a heating element, a heating power regulator and a constant temperature controller; or,

[0080] The temperature adjustment mechanism includes a heating element, a controller, and a temperature detector; or,

[0081] The temperature adjustment mechanism is a heating element, and the heating element is arranged near the temperature compensation element; or,

[0082] The temperature regulating mechanism is a micro thermostatic box;

[0083] The number of the heating element is at least one, and the heating element includes, but is not limited to, a silicone rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device, and a semiconductor;

[0084] The temperature controller is connected to the heating element and is used to control the heating temperature of the heating element. The temperature controller includes, but is not limited to, a PID controller, a controller combining PID and fuzzy control, a frequency conversion controller, and a PLC controller.

[0085] Preferably, at least two gas density relay bodies, at least two gas density detection sensors, at least two pressure regulating mechanisms, at least two gas flow limiting components, at least two online verification contact signal sampling units and one intelligent control unit are used to complete the online verification of the gas density relay; or,

[0086] At least two gas density relay bodies, at least two gas density detection sensors, at least two gas flow limiting components, at least two online verification contact signal sampling units, an intelligent control unit, and a pressure regulating mechanism are used to complete the online verification of the gas density relay.

[0087] Preferably, the gas density relay or gas density monitoring device also includes a sound alarm and / or a light alarm, and the sound alarm and / or the light alarm are connected to the intelligent control unit. When one of the collected values ​​of the intelligent control unit is abnormal, the sound alarm and / or the light alarm is activated; the collected values ​​include but are not limited to pressure values, temperature values, density values, contact signal action values ​​of the gas density relay body and / or contact signal return values.

[0088] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor.

[0089] Specifically, the pressure sensor can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor; it can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure sensor with a Baden tube and an induction coil), a resistance pressure sensor (such as a pressure sensor with a Baden tube and a sliding-wire resistor); it can be an analog pressure sensor or a digital pressure sensor.

[0090] More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor and / or an absolute pressure sensor.

[0091] Further, when the pressure sensor is an absolute pressure sensor, it is expressed in absolute pressure values, and its calibration result is the corresponding absolute pressure value at 20°C. When it is expressed in relative pressure values, its calibration result is converted into the corresponding relative pressure value at 20°C. When the pressure sensor is a relative pressure sensor, it is expressed in relative pressure values, and its calibration result is the corresponding relative pressure value at 20°C. When it is expressed in absolute pressure values, its calibration result is converted into the corresponding absolute pressure value at 20°C. The conversion relationship between the absolute pressure value and the relative pressure value is:

[0092] P 绝对压力 =P 相对压力 +P 标准大气压 .

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

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

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

[0096] Preferably, the intelligent control unit automatically controls the entire verification process, including all peripherals, logics, and inputs and outputs, based on the embedded system algorithm and control program of the microprocessor.

[0097] More preferably, the intelligent control unit automatically controls the entire verification process, including all peripherals, logic and input and output, based on embedded algorithms and control programs of general-purpose computers, industrial computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc.

[0098] Preferably, the intelligent control unit has an electrical interface, which completes test data storage, and / or test data export, and / or test data printing, and / or data communication with a host computer, and / or inputs analog and digital information.

[0099] Preferably, the gas density relay or gas density monitoring device supports input of basic information, and the basic information includes one or more of factory number, accuracy requirements, rated parameters, manufacturer, and operating position.

[0100] Preferably, the intelligent control unit also includes a communication module for realizing long-distance transmission of test data and / or verification results.

[0101] More preferably, the communication mode of the communication module is wired communication or wireless communication.

[0102] Furthermore, the wired communication method includes one or more of RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable.

[0103] Furthermore, the wireless communication method includes one or more of NB-IOT, 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

[0104] Preferably, the intelligent control unit is also provided with a clock, and the clock is configured to periodically set the calibration time of the gas density relay body, or record the test time, or record the event time.

[0105] Preferably, the intelligent control unit is controlled through on-site control and / or through background control.

[0106] More preferably, the gas density relay or gas density monitoring device completes the online verification of the gas density relay body according to the settings or instructions of the background; or, completes the online verification of the gas density relay body according to the set verification time of the gas density relay body.

[0107] Preferably, the gas density relay or gas density monitoring device further comprises: a display interface for human-computer interaction, connected to the intelligent control unit, displaying current calibration data in real time, and / or supporting data input.

[0108] Preferably, the gas density relay or gas density monitoring device further includes: a camera for monitoring.

[0109] Preferably, the gas density relay or gas density monitoring device further comprises: a trace water sensor connected to the gas density relay body and the intelligent control unit respectively, and / or a decomposition product sensor connected to the gas density relay body and the intelligent control unit respectively.

[0110] More preferably, the gas density relay or the gas density monitoring device further comprises: a gas circulation mechanism, which is respectively connected to the gas density relay body and the intelligent control unit, and comprises a capillary, a sealed chamber and a heating element.

[0111] Furthermore, the micro-water sensor can be installed in the sealed chamber of the gas circulation mechanism, in the capillary, at the capillary mouth, or outside the capillary.

[0112] The third aspect of the present application provides a method for calibrating a gas density relay, comprising:

[0113] In normal working state, the gas density relay monitors the gas density value in the electrical equipment;

[0114] The gas density relay or gas density monitoring device shall, according to the set calibration time and gas density value, perform the following operations under the conditions that allow calibration of the gas density relay:

[0115] The intelligent control unit controls the adjustment speed of the pressure regulating mechanism, and / or adjusts the flow rate, so that the gas flow rate flowing to the gas density relay body through the gas flow limiting member is not enough to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, so that the gas density relay body generates a contact signal action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body;

[0116] When all contact signal verification work is completed, the intelligent control unit stops the pressure regulating mechanism or restores the pressure regulating mechanism to the initial verification state.

[0117] Preferably, a method for calibrating a gas density relay comprises:

[0118] In normal working state, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment. At the same time, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit;

[0119] The gas density relay or gas density monitoring device shall, according to the set calibration time and gas density value, perform the following operations under the conditions that allow calibration of the gas density relay:

[0120] The online verification contact signal sampling unit is adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the contact signal control loop of the gas density relay body and connects the contacts of the gas density relay body to the intelligent control unit;

[0121] The intelligent control unit controls the adjustment speed of the pressure regulating mechanism, and / or adjusts the flow rate, so that the gas flow rate flowing to the gas density relay body through the gas flow limiting member is not enough to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, so that the gas density relay body generates a contact signal action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body;

[0122] The intelligent control unit drives or stops the pressure regulating mechanism to increase the gas pressure, so that the contacts of the gas density relay body are reset. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay body, and completes the verification of the contact signal return value of the gas density relay body;

[0123] When all contact signal verification work is completed, the intelligent control unit stops the pressure regulating mechanism, or restores the pressure regulating mechanism to the initial verification state, or restores the pressure regulating mechanism to the normal working state; 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.

[0124] In the above content of the present invention, it is more preferred that, at the same time, the gas flow rate of the gas flow limiting component flowing to the gas density relay body is Q1, and the gas flow rate flowing out or / and diffusing to the pressure regulating mechanism caused by the pressure drop of the gas density relay body being adjusted by the pressure regulating mechanism is Q2, Q2>Q1, and Q2 / Q1 is the set value.

[0125] In the above content of the present invention, preferably, Q1 is a fixed value, and the operation of the pressure regulating mechanism is controlled according to the required value of Q2 / Q1, for example, the regulating speed of the pressure regulating mechanism is controlled.

[0126] In the above content of the present invention, preferably, Q1 is adjusted to a preset value, and the operation of the pressure regulating mechanism is controlled according to the required value of Q2 / Q1, for example, the regulating speed of the pressure regulating mechanism is controlled.

[0127] In the above content of the present invention, preferably, Q2 is a constant value, and the gas flow Q1 of the gas flow limiting member is controlled to achieve the required value of Q2 / Q1.

[0128] In the above content of the present invention, preferably, Q1 and Q2 are adjusted simultaneously or separately to achieve the required value of Q2 / Q1.

[0129] Preferably, the flow rate of the gas flow limiting member is designed to match the regulating speed and regulating flow rate of the pressure regulating mechanism; or,

[0130] The flow rate of the gas flow limiting member is designed to match the adjustment speed of the pressure regulating mechanism; or,

[0131] The flow rate of the gas flow limiting member is designed to match the regulating flow rate of the pressure regulating mechanism; or,

[0132] The intelligent control unit adjusts the adjustment speed of the pressure adjustment mechanism according to the gas flow rate and / or gas pressure of the gas flow limiting member; or,

[0133] The intelligent control unit adjusts the adjustment speed of the pressure regulating mechanism according to the gas flow rate and / or gas pressure of the gas flow limiting member and / or the adjustment flow rate of the pressure regulating mechanism.

[0134] Preferably, the intelligent control unit automatically matches the adjustment speed of the pressure regulating mechanism according to the gas pressure of the gas flow limiting member during calibration. Specifically, when the gas pressure is low, the adjustment speed of the pressure regulating mechanism is slow; and when the gas pressure is high, the adjustment speed of the pressure regulating mechanism is fast.

[0135] Preferably, a method for calibrating a gas density relay further includes:

[0136] The inertia air chamber is connected to the air path of the gas density relay body through the first air channel, and is connected to the air path of the pressure regulating mechanism through the second air channel. The inertia air chamber is also connected to the other end of the gas flow limiting component; the inertia air chamber is a sealed air chamber configured to control the load change speed during gas pressure regulation.

[0137] More preferably, the air chamber volume of the inertia air chamber is much larger than the sum of the volumes of the air passages in other parts.

[0138] More preferably, the aperture of the gas flow limiting member is smaller than the aperture of the first gas channel, and the aperture of the first gas channel is smaller than the aperture of the second gas channel.

[0139] More preferably, the inertial air chamber is made of metal material or non-metal material with good sealing performance.

[0140] More preferably, the gas circuit of the pressure regulating mechanism is also sealed and connected to one end of the third air channel through a one-way valve, and the other end of the third air channel is provided with an interface for connecting the electrical equipment, and the one-way valve is used to control the gas flow of the pressure regulating mechanism to the electrical equipment.

[0141] Furthermore, the airway aperture of the gas flow limiting component is smaller than the aperture of the first airway, and the aperture of the first airway is smaller than the aperture of the third airway.

[0142] Preferably, the gas flow limiting element is a capillary tube, and / or a gas flow controller, or a microporous element, or a molecular sieve.

[0143] Preferably, the gas flow limiting member is arranged on the gas density relay body, or on the pressure regulating mechanism.

[0144] Preferably, the contact signal includes an alarm and / or a lock.

[0145] Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter composed of a pressure sensor and a temperature sensor is used; or, a density detection sensor using quartz tuning fork technology is used.

[0146] Preferably, after the gas density relay completes the calibration, if there is any abnormality, it can automatically issue an alarm, and upload it to a remote end, or send it to a designated receiver.

[0147] Preferably, the verification method further comprises: displaying the gas density value and the verification result on-site, or displaying the gas density value and the verification result through the background.

[0148] Preferably, the verification method further comprises: the intelligent control unit is controlled through on-site control and / or through background control.

[0149] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0150] The present application provides a gas density relay with an online self-checking function and a check method thereof, which is used for high-voltage and medium-voltage electrical equipment, including a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting component, an online check contact signal sampling unit and an intelligent control unit. During the check, the intelligent control unit controls the adjustment speed of the pressure regulating mechanism and / or adjusts the flow rate. The gas flow rate flowing to the gas density relay body through the gas flow limiting component is not enough to synchronously compensate for the pressure drop of the gas density relay body adjusted by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, so that the gas density relay body undergoes contact action, and the contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the alarm and / or locking contact signal action value and / or return value of the gas density relay body according to the density value when the contact is in action. The gas density relay can be checked without the need for maintenance personnel to go to the site, thereby improving the reliability of the power grid, improving efficiency and reducing costs. At the same time, the intelligent control unit can also perform mutual self-checking between the gas density relay body and the gas density detection sensor, so as to realize maintenance-free gas density relay with online self-checking function. At the same time, the entire verification process of the present invention realizes SF 6 Zero gas emission meets the requirements of environmental protection regulations. In particular, during calibration, there is no need for an electric control valve to isolate the gas path between the electrical equipment and the gas density relay body, which has better sealing performance, smaller volume, and is convenient for on-site modification, improving reliability and facilitating promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0151] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0152] Figure 1 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to the first embodiment;

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

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

[0155] Figure 4 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to a fourth embodiment;

[0156] Figure 5 1 is a schematic diagram of the structure of a gas density relay with an online self-checking function according to a fifth embodiment;

[0157] Figure 6 is a structural schematic diagram of a gas density relay with an online self-checking function according to a sixth embodiment;

[0158] Figure 7 It is a structural schematic diagram of a gas density relay with an online self-checking function according to a seventh embodiment. DETAILED DESCRIPTION

[0159] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0160] Embodiment 1:

[0161] like Figure 1 As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by Embodiment 1 of the present invention comprises: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas flow limiting component 4, a pressure regulating mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, an electrical device 8, an inertial gas chamber 12, and a one-way valve 13. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6, the intelligent control unit 7 and the gas density relay body 1 are arranged together, that is, the pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1. The gas density relay body 1 is connected to the inertial gas chamber 12 through the air passage 1A, and the inertial gas chamber 12 is connected to the electrical device 8 through the gas flow limiting component 4; the inertial gas chamber 12 is connected to the pressure regulating mechanism 5 through the air passage 12A. The pressure regulating mechanism 5 in this case is an air pump, and the inertial air chamber 12 is connected to the air intake hole (inlet hole) 5A of the pressure regulating mechanism 5 through the air passage 12A, and the air outlet hole (exhaust hole) 5B of the pressure regulating mechanism 5 is connected to the one-way valve 13, and the one-way valve 13 is connected to the electrical device 8 through the air passage 13A. The function of the one-way valve 13 is to discharge (flow) the gas of the pressure regulating mechanism 5 to the electrical device 8 through its air outlet hole (exhaust hole) 5B, while the gas in the electrical device 8 cannot flow into the pressure regulating mechanism 5. The inertial air chamber 12 is an air chamber of appropriate volume, made of metal material or non-metallic material with good sealing performance, and its volume is large enough to adapt to the gas flow limiting component 4 and the pressure regulating mechanism 5. First of all, since the volume of gas contained in the gas density relay body 1 is small, it can be ignored in the calculation, so its working principle is: Assume that the gas mass of the gas of the electrical device 8 entering the inertial air chamber 12 through the gas flow limiting component 4 per second is Q 进Through the pressure regulating mechanism 5, assuming that the mass of gas flowing out from the inertial air chamber 12 through the airway 12A per second is Q 出 Assume that the gas mass of the inertial gas chamber 12 is Q before the pressure regulating mechanism 5 is activated. 原来 After the pressure regulating mechanism 5 is activated, the ratio of the change in the gas mass per second in the inertial gas chamber 12 to the original gas mass in the inertial gas chamber 12 is (Q 出 -Q 进 ) / Q 原来 , due to Q 原来 With an appropriate gas mass (i.e., the inertial air chamber 12 has an appropriate volume), it is relatively easy to achieve: the load change rate is no more than 15‰ of the range per second, that is, the pressure can rise or fall smoothly. That is, the inertial air chamber 12 has a suitable gas pressure change inertia, which can easily achieve a load change rate of no more than 15‰ of the range per second. That is, when the inertial air chamber 12 is configured for gas pressure regulation, its load change rate can be easily controlled. The gas flow limiting component 4 can be a capillary, a gas flow controller, a microporous component, or a molecular sieve. In this case, a capillary is used. Among them, the airway aperture of the gas flow limiting component 4 is smaller than the aperture of the airway 1A; the aperture of the airway 1A is smaller than the aperture of the airway 12A; the aperture of the airway 1A is smaller than the aperture of the airway 13A. For example, in this case, the design may be as follows: the aperture of the gas flow limiting element 4 is 1 mm, the aperture of the gas flow limiting element 4 is 3 mm, the aperture of the gas flow limiting element 12A is 6 mm, and the aperture of the gas flow limiting element 13A is 4 mm or 3 mm. The gas density detection sensor is a pressure sensor 2 and a temperature sensor 3. On the gas path, the pressure sensor 2 is connected to the gas density relay body 1; the online verification contact signal sampling unit 6 is connected to the gas density relay body 1 and the intelligent control unit 7, and is configured to sample the contact signal of the gas density relay body; one end of the gas flow limiting component 4 is provided with an interface connected to the electrical equipment 8, and the other end of the gas flow limiting component 4 is connected to the gas density relay body 1 through the inertial gas chamber 12; the intelligent control unit 7 is also respectively connected to the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 of the gas density detection sensor, and is configured to complete the control of the pressure regulating mechanism 5, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body 1.

[0162] In normal working state, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment 8, and at the same time, the gas density relay or gas density monitoring device monitors the gas density value in the electrical equipment 8 online through the gas density detection sensor (2, 3) and the intelligent control unit 7.

[0163] The gas density relay or gas density monitoring device shall, according to the set calibration time and the gas density value, perform the following operations under the conditions that allow calibration of the gas density relay body 1:

[0164] First, the online verification contact signal sampling unit 6 is adjusted to the verification state through the intelligent control unit 7. In the verification state, the online verification contact signal sampling unit 6 cuts off the contact signal control loop of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit 7; the gas flow limiting component 4 makes the intake flow small, and the intelligent control unit 7 controls the pressure regulating mechanism 5 (the air pump in this case), and the pressure regulating mechanism 5 quickly adjusts the pressure and regulates the flow at the same time, which can adjust the gas pressure of the inertial gas chamber 12 to slowly drop, and then the gas pressure of the gas density relay body 1 can be slowly dropped, so that the gas density relay body 1 generates a contact signal action, and the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the contact is in action. 20 , or directly obtain the gas density value P 20 , detect the contact signal action value P of the gas density relay body 1 D20 , complete the contact signal action value P of the gas density relay body 1 D20 calibration work.

[0165] Next, the pressure regulating mechanism 5 is controlled by the intelligent control unit 7 to increase the gas pressure of the inertial gas chamber 12, thereby slowly increasing the gas pressure of the gas density relay body 1, so that the gas density relay body 1 resets the contacts. The contact reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the contacts are reset. 20 , or directly obtain the gas density value P 20 , detect the contact signal return value P of the gas density relay body 1 F20 , complete the contact signal return value P of the gas density relay body 1 F20 calibration work.

[0166] When all contact signal verification work is completed, the intelligent control unit 7 stops the pressure regulating mechanism 5, or restores the pressure regulating mechanism 5 to the initial verification state, or restores the pressure regulating mechanism 5 to the normal operating state; and adjusts the online verification contact signal sampling unit 6 to the working state, and the contact signal control circuit of the gas density relay body 1 is restored to the normal operating state.

[0167] In order to reduce the volume of the gas density relay or the gas density monitoring device, the volume of the pressure regulating mechanism (air pump) 5 can be reduced. The one-way valve 13 is used in this embodiment. Through the action of the one-way valve 13, the gas in the inertial gas chamber 12 and the pressure regulating mechanism 5 is discharged (flowed) to the electrical device 8 through the gas outlet (exhaust hole) 5B, while the gas in the electrical device 8 cannot flow into the pressure regulating mechanism 5, that is, the passage of the gas pressure regulating mechanism 5 to discharge (flow) to the electrical device 8 is cut off. In this way, the pressure regulating mechanism (air pump) 5 can exhaust gas (discharge to the electrical device 8) multiple times, so that the gas pressure of the inertial gas chamber 12 rises and falls, and then the gas pressure of the gas density relay body 1 rises and falls slowly, and the contact signal calibration work of the gas density relay body 1 is well completed.

[0168] When the gas density relay body 1 completes the calibration work, the gas density relay will make a judgment and can announce the test results. The method is flexible, specifically: 1) the gas density relay can be announced on the spot, such as through indicator lights, digital or LCD displays; 2) or the gas density relay can be uploaded through online remote communication, such as uploading to the background of the online monitoring system; 3) or uploaded wirelessly to a specific terminal, such as wirelessly uploading to a mobile phone; 4) or uploaded through other channels; 5) or upload abnormal results through an alarm signal line or a dedicated signal line; 6) upload alone, or upload with other signals. In short, after the gas density relay completes the online calibration of the gas density relay, if there is an abnormality, it can automatically issue an alarm, which can be uploaded to the remote end, or can be sent to a designated receiver, such as to a mobile phone. Alternatively, after the gas density relay completes the calibration of the gas density relay, if there is an abnormality, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay body 1 to the remote end (monitoring room, background monitoring platform, etc.), and can also display the notice on the spot. The simple version of the online calibration of the gas density relay can upload the abnormal calibration results through the alarm signal line. It can be uploaded in a certain pattern. For example, when abnormal, a contact is connected in parallel with the alarm signal contact, and it is closed and disconnected regularly, and the status can be obtained through analysis; or it can be uploaded through an independent calibration signal line. Specifically, it can be uploaded when the status is good, or when there is a problem, or it can be uploaded through remote density online monitoring, or the calibration results can be uploaded through a separate calibration signal line, or through local display, local alarm, or wireless upload, and upload through the Internet with a smart phone. The communication mode is wired or wireless. The wired communication mode can be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; the wireless communication mode can be 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, sensor built-in 5G / NB-IOT communication module (such as NB-IOT), etc. In short, multiple modes and multiple combinations can be used to fully guarantee the reliable performance of the gas density relay.

[0169] The gas density relay has a safety protection function. Specifically, when the gas density value is lower than the set value, the gas density relay will automatically stop online verification of the density relay and send out a warning signal. For example, when the gas density value of the equipment is less than the set value P S For example, online calibration can only be performed when the gas density value of the equipment is ≥ (alarm pressure value + 0.02MPa).

[0170] The gas density relay can be calibrated online according to the set time, and can also be calibrated online according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). When calibrating high temperature, low temperature, normal temperature, and 20°C ambient temperature online, the error judgment requirements are different. For example, when calibrating at 20°C ambient temperature, the accuracy requirement of the gas density relay can be 1.0 or 1.6, and it can be 2.5 at high temperature. It can be implemented according to the temperature requirements and relevant standards. For example, according to the temperature compensation performance provisions in Article 4.8 of DL / T 259 "Calibration Procedure for Sulfur Hexafluoride Gas Density Relay", the accuracy requirements corresponding to each temperature value.

[0171] The gas density relay can compare the error performance of the density relay at different temperatures and different time periods. That is, the performance of the gas density relay and electrical equipment can be determined by comparing different periods within the same temperature range. It can compare historical periods and historical and current periods. The gas density relay can be repeatedly calibrated multiple times (for example, 2 to 3 times), and its average value is calculated based on the results of each calibration. If necessary, the gas density relay can be calibrated online at any time. At the same time, the density relay can also monitor the gas density value, pressure value, and / or temperature value of the electrical equipment online, and upload them to the target device for online monitoring.

[0172] The gas density relay or gas density monitoring device also includes an acoustic and / or optical alarm, which is connected to the intelligent control unit. When one of the values ​​collected by the intelligent control unit, including but not limited to pressure value, temperature value, density value, contact signal action value of the gas density relay body and / or contact signal return value, is abnormal, the acoustic and / or optical alarm is activated.

[0173] Embodiment 2:

[0174] like Figure 2As shown, a gas density relay or gas density monitoring device with an online self-checking function provided by the second embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas flow limiting component 4, a pressure regulating mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, and an electrical device 8. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6, the intelligent control unit 7 and the gas density relay body 1 are arranged together, that is, the pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1. As in the first embodiment, the gas density relay body 1 is connected to the inertial gas chamber 12 through the airway 1A, and the inertial gas chamber 12 is connected to the electrical device 8 through the gas flow limiting component 4; the inertial gas chamber 12 is connected to the pressure regulating mechanism 5 through the airway 12A. The difference from the first embodiment is that the pressure regulating mechanism 5 in this case is a cavity 54 with an opening at one end, and the other end of the cavity 54 is connected to the inertial air chamber 12, and further connected to the gas density relay body 1; there is a piston 51 in the cavity 54, one end of the piston 51 is connected to an adjusting rod 53, the outer end of the adjusting rod 53 is connected to the driving component 52, the other end of the piston 51 extends into the opening and is in sealing contact with the inner wall of the cavity 54, the driving component 52 (which can be a motor, a stepping electric drive, or a reciprocating motion mechanism, a Carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust mechanism, an electric heating thrust mechanism, a chemical reaction thrust mechanism, a pneumatic element, and in this case it is a stepping motor) drives the adjusting rod 53 and then drives the piston 51 to move in the cavity 54; the piston 51 is in sealing contact with the inner wall of the cavity 54 through a sealing member 510.

[0175] When the inertial air chamber 12 is configured to adjust the gas pressure, its load change speed can be easily controlled. Among them, the airway aperture of the gas flow limiting member 4 is smaller than the aperture of the airway 1A; the aperture of the airway 1A is smaller than the aperture of the airway 12A. For example, in this case, it can be designed as follows: the airway aperture of the gas flow limiting member 4 is 1mm, the aperture of the airway 1A is 2mm, and the aperture of the airway 12A is 4mm. The gas density detection sensor is a pressure sensor 2 and a temperature sensor 3. On the gas path, the pressure sensor 2 is connected to the gas density relay body 1; the online verification contact signal sampling unit 6 is connected to the gas density relay body 1 and the intelligent control unit 7, and is configured to sample the contact signal of the gas density relay body 1; the gas flow limiting component 4 is a small hole connector, one end of the gas flow limiting component 4 is provided with an interface connected to the electrical equipment 8, and the other end of the gas flow limiting component 4 is connected to the gas density relay body 1 through the inertial gas chamber 12; the intelligent control unit 7 is also respectively connected to the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 of the gas density detection sensor, and is configured to complete the control of the pressure regulating mechanism 5, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body 1.

[0176] In normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment. At the same time, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment 8 online through the gas density detection sensor (2, 3) and the intelligent control unit 7.

[0177] The gas density relay or gas density monitoring device shall, according to the set calibration time and the gas density value, perform the following operations under the conditions that allow calibration of the gas density relay body 1:

[0178] First, the online verification contact signal sampling unit 6 is adjusted to the verification state through the intelligent control unit 7. In the verification state, the online verification contact signal sampling unit 6 cuts off the contact signal control circuit of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit 7; the gas flow limiting member 4 is used to reduce the intake flow, and the intelligent control unit 7 controls the pressure regulating mechanism 5 and the driving component 52 of the pressure regulating mechanism 5, thereby driving the regulating rod 53 to drive the piston 51 to move in the cavity 54. Since the driving component 52 of the pressure regulating mechanism 5 quickly drives the piston 51 to move in the cavity 54, and thus adjusts the pressure, and at the same time, its adjustment flow is large, it can adjust the gas pressure of the inertial gas chamber 12 to slowly drop, and then it can complete the slow drop of the gas pressure of the gas density relay body 1, so that the gas density relay body 1 generates a contact signal action, and the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the contact is in action. 20 , or directly obtain the gas density value P 20 , detect the contact signal action value P of the gas density relay body 1 D20 , complete the contact signal action value P of the gas density relay body 1 D20 calibration work.

[0179] Next, the pressure regulating mechanism 5 is controlled by the intelligent control unit 7 to increase the gas pressure of the inertial gas chamber 12, thereby slowly increasing the gas pressure of the gas density relay body 1, so that the gas density relay body 1 resets the contacts. The contact reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the contacts are reset. 20 , or directly obtain the gas density value P 20 , detect the contact signal return value P of the gas density relay body 1 F20 , complete the contact signal return value P of the gas density relay body 1 F20 calibration work.

[0180] When all contact signal verification work is completed, the intelligent control unit 7 stops the pressure regulating mechanism 5, or restores the pressure regulating mechanism 5 to the initial verification state, or restores the pressure regulating mechanism 5 to the normal operating state; and adjusts the online verification contact signal sampling unit 6 to the working state, and the contact signal control circuit of the gas density relay body 1 is restored to the normal operating state.

[0181] The flow rate of the gas flow limiting member 4 is designed to match the regulating speed and regulating flow rate of the pressure regulating mechanism 5; or, the flow rate of the gas flow limiting member 4 is designed to match the regulating speed of the pressure regulating mechanism 5; or, the flow rate of the gas flow limiting member 4 is designed to match the regulating flow rate of the pressure regulating mechanism 5; or, the intelligent control unit 7 can adjust the regulating speed of the pressure regulating mechanism 5 according to the flow rate of the gas flow limiting member 4 and / or the gas pressure; or, the intelligent control unit 7 can adjust the regulating speed of the pressure regulating mechanism 5 according to the flow rate of the gas flow limiting member 4 and / or the gas pressure and / or the regulating flow rate of the pressure regulating mechanism 5. During the calibration, the intelligent control unit 7 controls the regulating speed and / or regulating flow rate of the pressure regulating mechanism 5, so that the gas flow rate flowing to the gas density relay body 1 through the gas flow limiting member 4 is not enough to synchronously compensate for the pressure drop of the gas density relay body 1 adjusted by the pressure regulating mechanism 5, thereby completing the gas pressure drop of the gas density relay body 1 and causing the contact signal action of the gas density relay body 1. The intelligent control unit 7 can automatically match the adjustment speed of the pressure regulating mechanism 5 according to the gas pressure during the calibration. When the gas pressure is low, the adjustment speed of the pressure regulating mechanism 5 is slow; and when the gas pressure is high, the adjustment speed of the pressure regulating mechanism 5 is fast.

[0182] Embodiment three:

[0183] like Figure 3 As shown, a gas density relay or gas density monitoring device with an online calibration function includes a gas density relay body 1, and the gas density relay body 1 includes: a housing 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, and a dial 107 arranged in the housing 101. One end of the pressure detector 103 is fixed on the base 102 and communicated with it, and the other end of the pressure detector 103 is connected to one end of the temperature compensation element 104 through the end seat 108. The other end of the temperature compensation element 104 is provided with a crossbeam, and the crossbeam is provided with an adjustment member for pushing the signal generator 109 to connect or disconnect the contact of the signal generator 109. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected to the movement 105 through a connecting rod or directly connected to the movement 105; the pointer 106 is installed on the movement 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay body 1 can also include a digital device or a liquid crystal device with a value display.

[0184] In addition, the gas density relay with online verification function also includes: a pressure sensor 2, a temperature sensor 3, a gas flow limiting component 4, a pressure regulating mechanism 5, an online verification contact signal sampling unit 6, and an intelligent control unit 7. The gas flow limiting component 4 is a tiny hole, one end of the gas flow limiting component 4 is sealed and connected to the electrical equipment 8 through an electrical equipment connection joint 110, and the other end of the gas flow limiting component 4 is connected to the base 102; the pressure sensor 2 is connected to the pressure detector 103 on the gas path; the pressure regulating mechanism 5 is connected to the pressure detector 103; the online verification contact signal sampling unit 6 is respectively connected to the signal generator 109 and the intelligent control unit 7; the pressure regulating mechanism 5 is also respectively connected to the intelligent control unit 7.

[0185] The signal generator 109 includes a micro switch or a magnetic assist type electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 includes a Baden tube or a bellows; the temperature compensation element 104 uses a temperature compensation sheet or a gas enclosed in a shell. The gas density relay body 1 of the present application may also include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge.

[0186] In the gas density relay body 1 of the present embodiment, the pressure detector 103 and the temperature compensation element 104 are used to correct the changing pressure and temperature to reflect the change in the density of sulfur hexafluoride gas. That is, under the pressure of the sulfur hexafluoride (SF6) gas to be measured, due to the effect of the temperature compensation element 104, when the density value of sulfur hexafluoride gas changes, the pressure value of sulfur hexafluoride gas also changes accordingly, forcing the end of the pressure detector 103 to produce a corresponding elastic deformation displacement, which is transmitted to the movement 105 with the help of the temperature compensation element 104, and the movement 105 is transmitted to the pointer 106, so that the measured sulfur hexafluoride gas density value is indicated on the dial 107. The signal generator 109 is used as an output alarm locking contact. In this way, the gas density relay body 1 can display the sulfur hexafluoride gas density value. If there is a gas leak, the density of sulfur hexafluoride gas decreases, and the pressure detector 103 produces a corresponding downward displacement, which is transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 transmits it to the pointer 106. The pointer 106 moves in the direction of a smaller indication, and the degree of gas leakage is specifically displayed on the dial 107. At the same time, the pressure detector 103 drives the crossbeam to move downward through the temperature compensation element 104, and the adjustment part on the crossbeam gradually moves away from the signal generator 109. When it reaches a certain degree, the contact of the signal generator 109 is connected, and a corresponding contact signal (alarm or lockout) is issued, so as to monitor and control the density of sulfur hexafluoride gas in equipment such as electrical switches, so that the electrical equipment can work safely.

[0187] If the gas density value increases, that is, the sulfur hexafluoride gas pressure value in the sealed gas chamber is greater than the set sulfur hexafluoride gas pressure value, the pressure value also increases accordingly, and the end of the pressure detector 103 and the temperature compensation element 104 produce a corresponding upward displacement. The temperature compensation element 104 causes the crossbeam to also move upward, and the adjustment part on the crossbeam moves upward and pushes the contact of the signal generator 109 to disconnect, and the contact signal is released.

[0188] In the above embodiment, the gas flow limiting element 4 can be various, including but not limited to a capillary tube, and / or a gas flow controller, or a microporous element, or a molecular sieve, and can be flexibly designed according to actual needs.

[0189] Type of pressure sensor 2: It can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number can be several. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Baden tube), or a resistance pressure sensor (such as a pressure measurement sensor with a sliding wire resistor attached to a Baden tube). It can be an analog pressure sensor or a digital pressure sensor. Pressure acquisition is a variety of pressure-sensing elements such as pressure sensors and pressure transmitters, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).

[0190] The temperature sensor 3 can be a thermocouple, a thermistor, or a semiconductor type; it can be a contact type or a non-contact type; it can be a thermal resistor or a thermocouple. In short, temperature acquisition can be performed using various temperature sensing elements such as a temperature sensor and a temperature transmitter.

[0191] The online verification contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. That is, the basic requirements or functions of the online verification contact signal sampling unit 6 are: 1) It does not affect the safe operation of electrical equipment during verification. That is, during verification, when the contact signal of the gas density relay body 1 is activated, it will not affect the safe operation of electrical equipment; 2) The contact signal control circuit of the gas density relay body 1 does not affect the performance of the gas density relay, especially the performance of the intelligent control unit 7, and will not damage the gas density relay or affect the test work.

[0192] The basic requirements or functions of the intelligent control unit 7 are: to complete the control and signal collection of the pressure regulating mechanism 5 through the intelligent control unit 7. If the gas flow limiting element 4 adopts a gas flow controller, the gas flow limiting element 4 is controlled by the intelligent control unit 7. Realization: to be able to detect the pressure value and temperature value when the contact signal of the gas density relay body 1 is actuated, and convert it into the corresponding pressure value P at 20°C20 (density value), that is, the contact action value P of the gas density relay body 1 can be detected D20 , complete the calibration work of the gas density relay body 1. Alternatively, the density value P when the contact signal of the gas density relay body 1 is actuated can be directly detected. D20 , complete the calibration work of the gas density relay body 1. At the same time, through the test of the rated pressure value of the gas density relay body 1, the self-calibration work between the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 can be completed to achieve maintenance-free. Of course, the intelligent control unit 7 can also achieve: complete test data storage; and / or test data export; and / or test data can be printed; and / or data communication with the host computer can be carried out; and / or analog and digital information can be input. The intelligent control unit 7 also includes a communication module, through which the long-distance transmission of test data and / or calibration results and other information is realized; when the rated pressure value of the gas density relay body 1 outputs a signal, the intelligent control unit 7 simultaneously collects the density value at that time to complete the rated pressure value calibration of the gas density relay body 1.

[0193] Electrical equipment, including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment. Specifically, electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas charging cabinets, ring main cabinets, etc.

[0194] The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the gas flow limiting component 4, the pressure regulating mechanism 5, the online verification contact signal sampling unit 6, the intelligent control unit 7 and the multi-way connector 9 can be flexibly arranged as needed. For example, the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be arranged together; or the gas flow limiting component 4 and the pressure regulating mechanism 5 can be arranged together; in short, the settings between them can be flexibly arranged and combined. The gas density relay body 1, the gas density detection sensor (2, 3), the pressure regulating mechanism 5, the gas flow limiting component 4, the online verification contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly arranged as needed.

[0195] The working principle of the gas density relay with online calibration function in this embodiment is as follows:

[0196] The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment 8 according to the pressure sensor 2 and the temperature sensor 3, and obtains the corresponding 20°C pressure value P 20 (i.e. gas density value). When the density relay body 1 needs to be calibrated, if the gas density value P 20 ≥Set safety verification density value PS The gas density relay issues a command to disconnect the control circuit of the gas density relay body 1 through the intelligent control unit 7, so that the online verification of the gas density relay body 1 will not affect the safe operation of the electrical equipment 8, nor will it send an alarm signal by mistake or lock the control circuit during the verification. Because the gas density relay body 1 has already carried out the gas density value P before the verification begins. 20 ≥Set safety verification density value P S Through monitoring and judgment, the gas in the electrical equipment 8 is within the safe operating range, and gas leakage is a slow process, so it is safe during verification. At the same time, the intelligent control unit 7 is connected to the contact sampling circuit of the gas density relay body 1, and then the intelligent control unit 7 controls the driving components of the pressure regulating mechanism 5 (it can be mainly implemented by motors (motors) and gears, and the methods are diverse and flexible). The intelligent control unit 7 controls the adjustment speed of the pressure regulating mechanism 5, and / or adjusts the flow rate, so that the gas flow rate flowing to the gas density relay body 1 through the gas flow limiting member 4 is not enough to synchronously compensate for the pressure drop of the gas density relay body 1 adjusted by the pressure regulating mechanism 5. The cavity composed of the pressure regulating mechanism 5, the gas density relay body 1, the gas flow limiting member 4, etc. undergoes a volume change, and the pressure of the gas in the gas density relay body 1 gradually decreases, causing the gas density relay body 1 to undergo contact action, and its contact action is uploaded to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 converts the pressure value and temperature value measured during the contact action into the corresponding pressure value P at 20°C according to the gas characteristics. 20 (density value), the contact action value P of the gas density relay body 1 can be detected D20 , after all the contact action values ​​of the alarm and / or locking signals of the gas density relay body 1 are detected, the intelligent control unit 7 controls the driving components of the pressure regulating mechanism 5 to gradually increase the gas pressure of the gas density relay body 1, and test the return value of the alarm and / or locking contact signals of the gas density relay body 1. Repeat the verification several times (for example, 2 to 3 times), and then calculate the average value, so that the verification of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. At the same time, the pressure regulating mechanism 5 stops working. The control circuit of the gas density relay body 1 is connected through the intelligent control unit 7, and the density monitoring circuit of the gas density relay body 1 works normally. The gas density relay body 1 safely monitors the gas density of the electrical equipment, so that the gas equipment works safely and reliably. In this way, it is convenient to complete the online verification of the gas density relay body 1, and the online verification of the gas density relay body 1 will not affect the safe operation of the electrical equipment 8.

[0197] Embodiment 4:

[0198] like Figure 4 As shown, a gas density relay or gas density monitoring device with an online self-calibration function includes: a gas density relay body 1 (the gas density relay body 1 mainly also includes: a shell, and a base arranged in the shell, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators and electrical equipment connection joints), a pressure sensor 2, a temperature sensor 3, a gas flow limiting component 4, a pressure regulating mechanism 5, an online calibration contact signal sampling unit 6 and an intelligent control unit 7.

[0199] One end of the gas flow limiting member 4 is sealed and connected to the electrical device 8 through the electrical device connection joint 110, and the other end of the gas flow limiting member 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 intelligent control unit 7 are arranged on or in the shell of the gas density relay body 1. The pressure sensor 2 is connected to the pressure detector of the gas density relay body 1 on the gas path; the pressure regulating 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 intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected to the intelligent control unit 7; the pressure regulating mechanism 5 is connected to the intelligent control unit 7.

[0200] Different from the first embodiment, the pressure regulating mechanism 5 of this embodiment is a cavity with an opening at one end, a piston 51 is arranged in the cavity, the piston 51 is provided with a sealing ring 510, one end of the piston 51 is connected to an adjusting rod, the outer end of the adjusting rod is connected to a driving component 52, the other end of the piston 51 extends into the opening and contacts the inner wall of the cavity, the driving component 52 drives the adjusting rod and then drives the piston 51 to move in the cavity, so that the volume of the sealed part in the cavity changes, thereby completing the pressure rise and fall. The driving component 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a reciprocating motion mechanism, a Carnot cycle mechanism, and a pneumatic element.

[0201] In another preferred embodiment, the pressure regulating mechanism 5 can also be a solenoid valve, which is sealed inside a housing. The pressure regulating mechanism 5 opens the solenoid valve according to the control of the intelligent control unit 7, causing pressure changes, thereby completing the pressure rise and fall.

[0202] In another preferred embodiment, the pressure regulating mechanism 5 can also be composed of a bellows and a driving component 52. The bellows is sealed and connected to the pressure detector of the gas density relay body 1 to form a reliable sealed cavity. The pressure regulating mechanism 5 is controlled by the intelligent control unit 7 so that the driving component 52 pushes the bellows to change in volume, thereby changing the volume of the sealed cavity, thereby completing the pressure rise and fall.

[0203] In another preferred embodiment, the pressure regulating mechanism 5 can also be composed of an air chamber, a heating element, and a heat-insulating component. The outside (or inside) of the air chamber is provided with a heating element, and the heating causes a change in temperature, thereby achieving the increase or decrease in pressure.

[0204] Of course, the pressure regulating mechanism 5 can also have many other forms, not limited to those listed above, and other mechanisms that can achieve the pressure raising and lowering function are also covered within the protection scope of this application.

[0205] The pressure is adjusted by the pressure regulating mechanism 5, so that the signal generator of the gas density relay body 1 generates contact action, and the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 detects the alarm and / or locking contact signal action value and / or return value of the gas density relay according to the gas density value when the gas density relay body 1 generates contact action, or according to the pressure value and temperature value converted into the corresponding gas density value, and completes the calibration of the gas density relay. Or as long as the alarm and / or locking contact action value is detected, the calibration of the gas density relay is completed.

[0206] Embodiment five:

[0207] like Figure 5 As shown, this embodiment adds a gas supply interface 10 and a self-sealing valve 11 compared with the fourth embodiment. One end of the self-sealing valve 11 is sealed and connected to the electrical device, and the other end of the self-sealing valve 11 is connected to one end of the gas flow limiting member 4 and the gas supply interface 10 through a connecting pipe.

[0208] Embodiment six:

[0209] like Figure 6As shown, a gas density relay or gas density monitoring device with an online self-calibration function is different from the fourth embodiment in that the other end of the gas flow limiting component 4 is connected to the gas path of the pressure regulating mechanism 5 through a connecting pipe, thereby connecting the gas flow limiting component 4 with the base of the gas density relay body 1 and the pressure detector. Of course, this embodiment six can also add a gas replenishing interface and a self-sealing valve. For example, one end of the self-sealing valve is sealed and connected to the electrical equipment, and the other end of the self-sealing valve is connected to one end of the gas flow limiting component 4 and the gas replenishing interface through a connecting pipe. If the gas flow limiting component 4 adopts a gas flow controller, the gas flow limiting component 4 is connected to the intelligent control unit 7, and the control of the gas flow limiting component 4 is completed through the intelligent control unit 7.

[0210] Embodiment seven:

[0211] like Figure 7 As shown, a gas density relay or gas density monitoring device with an online self-checking function includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas flow limiting component 4, a pressure regulating mechanism 5, an online check contact signal sampling unit 6, and an intelligent control unit 7. One end of the gas flow limiting component 4 is sealed and connected to the electrical equipment through an electrical equipment connection joint, and the other end of the gas flow limiting component 4 is connected to the base of the gas density relay body 1, the pressure sensor 2, and the pressure regulating mechanism 5. The pressure sensor 2, the temperature sensor 3, the gas flow limiting component 4, and the pressure regulating mechanism 5 are arranged on the rear side of the housing of the gas density relay body 1. The online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electrical equipment connection joint. The pressure sensor 2 is connected to the pressure detector on the gas path through the base of the gas density relay body 1; the pressure regulating mechanism 5 is connected to the pressure detector of the gas density relay body 1. The pressure sensor 2, the temperature sensor 3, and the pressure regulating mechanism 5 are respectively connected to the intelligent control unit 7. Different from the third embodiment, the pressure sensor 2, the temperature sensor 3, the gas flow limiting element 4 and the pressure regulating mechanism 5 are arranged on the rear side of the housing of the gas density relay body 1. The gas flow limiting element 4 is made of a molecular sieve.

[0212] A gas density relay with an online self-checking function generally refers to a gas density relay whose components are designed as an integrated structure; while a gas density monitoring device generally refers to a gas density relay whose components are designed as a separate structure with flexible composition.

[0213] In summary, the present invention provides a gas density relay with online self-calibration function and a calibration method thereof, which consists of a gas circuit (can be through a pipeline) connection part, a pressure regulating part, a signal measurement control part, etc. The main function is to perform online calibration measurement of the contact signal (pressure value during alarm / locking action) of the gas density relay at ambient temperature, and automatically convert it into the corresponding pressure value at 20°C, and realize the performance detection of the contact (alarm and lockout) value of the gas density relay online. The installation positions of the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the pressure regulating mechanism 5, the gas flow limiting component 4, the online calibration contact signal sampling unit 6, and the intelligent control unit 7 can be flexibly combined. For example: the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the online calibration contact signal sampling unit 6, and the intelligent control unit 7 can be combined together, integrated design, or split design; can be installed on the housing, or on a multi-way joint, or can be connected together through a connecting pipe. The gas flow limiting component 4 can be directly connected to the electrical equipment 8, or it can be connected through a self-sealing valve or a gas pipe. The pressure sensor 2, the temperature sensor 3, the online calibration contact signal sampling unit 6, and the intelligent control unit 7 can be combined together for an integrated design; the pressure sensor 2, the temperature sensor 3 can be combined together for an integrated design; the online calibration contact signal sampling unit 6, and the intelligent control unit 7 can be combined together for an integrated design. In short, the structure is not limited to one style.

[0214] The gas density relay with online self-checking function can have different error judgment requirements when checking the contacts of the density relay at high temperature, low temperature, normal temperature and 20℃ ambient temperature. It can be implemented according to the temperature requirements and relevant standards. It can compare the error performance of the density relay at different temperatures and different time periods. That is, the performance of the density relay can be judged by comparing different periods within the same temperature range. It can compare the historical periods and the history with the present. It can also perform a physical examination on the density relay body. If necessary, it can check the contact signal of the density relay at any time. It can judge whether the density value of the gas density relay body and the monitored electrical equipment is normal. That is, it can judge, analyze and compare the density value of the electrical equipment itself, the gas density relay body, the pressure sensor and the temperature sensor, and then judge, compare and analyze the status of the electrical equipment gas density monitoring and the density relay body. It also monitors the contact signal status of the gas density relay and transmits its status remotely. The contact signal status of the gas density relay can be known in the background: open or closed, thereby adding an extra layer of monitoring and improving reliability; the temperature compensation performance of the gas density relay body can also be detected, or detected and determined; the contact resistance of the gas density relay body can also be detected, or detected and determined; the insulation performance of the gas density relay body can also be detected, or detected and determined. The gas flow limiting component includes, but is not limited to, a capillary, and / or a gas flow controller, or a microporous component, or a molecular sieve. The gas flow limiting component is arranged on the gas density relay body, or on the pressure regulating mechanism, or on the inertial gas chamber.

[0215] The application has a compact and reasonable structure, and each component has good anti-rust and anti-vibration capabilities, is firmly installed, and is reliable to use. The connection and disassembly of each pipeline of the gas density relay are easy to operate, and the equipment and components are easy to maintain. The application can complete the calibration of the gas density relay without the need for maintenance personnel to go to the site, which greatly improves the reliability of the power grid, improves efficiency, and reduces costs.

[0216] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A gas density relay with online self-checking function, characterized in that: include: Gas density relay body, gas density detection sensor, pressure regulating mechanism, gas flow limiting component, online calibration contact signal sampling unit and intelligent control unit; The gas density detection sensor is connected to the gas density relay body; The online verification contact signal sampling unit is connected to the gas density relay body and is configured to sample the contact signal of the gas density relay body; The gas path of the pressure regulating mechanism is connected to the gas density relay body; the pressure regulating mechanism is configured to adjust the pressure rise and fall of the gas density relay body so that the gas density relay body generates a contact signal action; The gas flow limiting component has an interface connected to the electrical equipment at one end, and the other end is connected to the gas path of the gas density relay body, or the other end of the gas flow limiting component is connected to the gas path of the pressure regulating mechanism, so that the gas flow limiting component is connected to the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting component is not sufficient to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism; The intelligent control unit is connected to the pressure regulating mechanism, the gas density detection sensor and the online verification contact signal sampling unit respectively, and is configured to complete the control of the pressure regulating mechanism, pressure value collection and temperature value collection and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay body; Wherein, the contact signal includes alarm and / or lock.

2. The gas density relay according to claim 1, characterized in that: At the same time, the gas flow rate from the gas flow limiting member to the gas density relay body is Q1, and the gas flow rate flowing out and / or diffusing to the pressure regulating mechanism caused by the pressure drop of the gas density relay body being adjusted by the pressure regulating mechanism is Q2, Q2>Q1, and Q2 / Q1 is the set value.

3. The gas density relay according to claim 1, characterized in that: The intelligent control unit adjusts the adjustment speed of the pressure adjustment mechanism according to the gas flow and / or gas pressure of the gas flow limiting member; or, The intelligent control unit adjusts the adjustment speed of the pressure regulating mechanism according to the gas flow and / or gas pressure of the gas flow limiting member and / or the adjustment flow of the pressure regulating mechanism.

4. The gas density relay according to claim 1, characterized in that: The intelligent control unit automatically matches the adjustment speed of the pressure regulating mechanism according to the gas pressure of the gas flow limiting component during calibration.

5. The gas density relay according to claim 4, characterized in that: When the gas pressure of the gas flow limiting element is low, the adjustment speed of the pressure regulating mechanism is slow; and when the gas pressure is high, the adjustment speed of the pressure regulating mechanism is fast.

6. The gas density relay according to claim 1, characterized in that: According to the flow rate of the gas flow limiting element, the pressure regulating mechanism slowly increases or decreases the load when increasing or decreasing the pressure of the gas density relay body; when measuring the contact signal action value of the gas density relay body, the load change speed is no more than 15‰ of the range per second when approaching the action value.

7. The gas density relay according to claim 1, characterized in that: The gas flow limiting component is a capillary tube and / or a gas flow controller, or a microporous component, or a molecular sieve.

8. The gas density relay according to claim 1, characterized in that: The gas flow limiting component is arranged on the gas density relay body, or on the pressure regulating mechanism.

9. The gas density relay according to claim 1, characterized in that: It also includes an inertia air chamber, which is a sealed air chamber. The inertia air chamber is connected to the air path of the gas density relay body through a first air channel, and is connected to the air path of the pressure regulating mechanism through a second air channel. The inertia air chamber is also connected to the other end of the gas flow limiting component; the inertia air chamber is configured to control the load change speed during gas pressure regulation.

10. The gas density relay according to claim 9, characterized in that: The air chamber volume of the inertial air chamber is much larger than the sum of the volumes of the air passages in other parts.

11. The gas density relay according to claim 9, characterized in that: The air channel aperture of the gas flow limiting component is smaller than the aperture of the first air channel, and the aperture of the first air channel is smaller than the aperture of the second air channel.

12. The gas density relay according to claim 9, characterized in that: The gas circuit of the pressure regulating mechanism is also sealed and connected to one end of the third gas channel through a one-way valve. The other end of the third gas channel is provided with an interface for connecting the electrical equipment. The one-way valve is used to control the gas flow of the pressure regulating mechanism to the electrical equipment.

13. The gas density relay according to claim 12, characterized in that: The air channel aperture of the gas flow limiting component is smaller than the aperture of the first air channel, and the aperture of the first air channel is smaller than the aperture of the third air channel.

14. The gas density relay according to claim 1, characterized in that: The gas density relay body includes: a shell, and a base, a pressure detector, a temperature compensation element and a plurality of signal generators arranged in the shell; wherein the signal generator includes a micro switch or a magnetic-assisted electric contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes a Baden tube or a bellows; the temperature compensation element uses a temperature compensation sheet or a gas enclosed in the shell.

15. The gas density relay according to claim 14, characterized in that: The gas circuit of the pressure regulating mechanism is connected to the pressure detector; the other end of the gas flow limiting component is connected to the base and the pressure detector, or the other end of the gas flow limiting component is connected to the gas circuit of the pressure regulating mechanism, thereby connecting the gas flow limiting component to the base and the pressure detector; the online verification contact signal sampling unit is connected to the signal generator.

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

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

18. The gas density relay according to claim 1, characterized in that: The pressure regulating mechanism is an air chamber, and a heating element and / or a cooling element are provided outside or inside the air chamber. The heating by the heating element and / or the cooling by the cooling element cause the temperature of the gas in the air chamber to change, thereby completing the pressure rise and fall of the gas density relay; or The pressure regulating mechanism is a cavity with an opening at one end, and the other end of the cavity is connected to the gas density relay body; there is a piston in the cavity, one end of the piston is connected to an adjusting rod, the outer end of the adjusting rod is connected to a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod and then drives the piston to move in the cavity; or, The pressure regulating mechanism is an air chamber, a piston is provided inside the air chamber, the piston is in sealing contact with the inner wall of the air chamber, a driving component is provided outside the air chamber, and the driving component drives the piston to move in the cavity through electromagnetic force; or, The pressure regulating mechanism is an airbag with one end connected to a driving component, the airbag changes volume under the driving of the driving component, and the airbag is connected to the gas density relay body; or, The pressure regulating mechanism is a bellows, one end of which is connected to the gas density relay body, and the other end of which is driven by a driving component to expand and contract; or The pressure regulating mechanism is a bleed valve, which is a solenoid valve or an electric valve, or other bleed valves realized by electrical or pneumatic means; or, The pressure regulating mechanism is a compressor; or, The pressure regulating mechanism is a pump, and the pump includes one of a pressure-generating pump, a booster pump, an electric air pump, and an electromagnetic air pump; or The pressure regulating mechanism is a boost valve; Wherein, the driving component includes one of a magnetic force, a motor, a reciprocating motion mechanism, a Carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust mechanism, a chemical reaction thrust mechanism, and a pneumatic element.

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

20. The gas density relay according to claim 19, characterized in that: The isolation sampling element includes one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler, and a thyristor.

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

22. The gas density relay according to claim 21, characterized in that: The intelligent control unit calculates the gas density value by using the mean method, and the mean method is: within a set time interval, the collection frequency is set, and the average value of all N gas density values ​​collected at different time points is calculated and processed to obtain its gas density value; or, within a set time interval, the temperature interval step is set, and the density values ​​corresponding to N different temperature values ​​collected within the entire temperature range are calculated and processed to obtain its gas density value; or, within a set time interval, the pressure interval step is set, and the density values ​​corresponding to N different pressure values ​​collected within the entire pressure change range are calculated and processed to obtain its gas density value; wherein N is a positive integer greater than or equal to 1.

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

24. The gas density relay according to claim 1, characterized in that: It also includes a multi-way connector, on which the gas density relay body, the gas flow limiting element and the pressure regulating mechanism are arranged; or, The gas flow limiting element and the pressure regulating mechanism are arranged on the multi-way connector; or, The gas density relay body, the gas density detection sensor, the gas flow limiting component and the pressure regulating mechanism are arranged on the multi-way connector.

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

26. The gas density relay according to claim 25, characterized in that: The temperature regulating mechanism is composed of a heating element, a heat-insulating member, a temperature controller, a temperature detector and a temperature regulating mechanism housing; or, The temperature adjustment mechanism is composed of a heating element and a temperature controller; or, The temperature regulating mechanism is composed of a heating element, a heating power regulator and a temperature controller; or, The temperature adjustment mechanism is composed of a heating element, a cooling element, a power regulator and a temperature controller; or, The temperature adjustment mechanism is composed of a heating element, a heating power regulator and a constant temperature controller; or, The temperature adjustment mechanism is composed of a heating element, a temperature controller and a temperature detector; or, The temperature adjustment mechanism is a heating element, and the heating element is arranged near the temperature compensation element; or, The temperature regulating mechanism is a micro thermostatic box; Wherein, the number of the heating element is at least one, and the heating element includes one of a silicone rubber heater, a resistance wire, an electric belt, an electric heating rod, a hot air blower, an infrared heating device, and a semiconductor; The temperature controller is connected to the heating element and is used to control the heating temperature of the heating element. The temperature controller includes one of a PID controller, a controller combining PID and fuzzy control, a frequency conversion controller, and a PLC controller.

27. The gas density relay according to claim 1, characterized in that: At least two gas density relay bodies, at least two gas density detection sensors, at least two pressure regulating mechanisms, at least two gas flow limiting components, at least two online verification contact signal sampling units and one intelligent control unit to complete the online verification of the gas density relay; or, At least two gas density relay bodies, at least two gas density detection sensors, at least two gas flow limiting components, at least two online verification contact signal sampling units, an intelligent control unit and a pressure regulating mechanism are used to complete the online verification of the gas density relay.

28. The gas density relay according to claim 1, characterized in that: It also includes a sound alarm and / or a light alarm, which is connected to the intelligent control unit. When one of the collected values ​​of the intelligent control unit is abnormal, the sound alarm and / or the light alarm is activated; the collected values ​​include pressure values, temperature values, density values, contact signal action values ​​and / or contact signal return values ​​of the gas density relay body.

29. A gas density monitoring device with online self-calibration function, characterized in that: The gas density monitoring device is composed of a gas density relay with an online self-checking function as described in any one of claims 1 to 28; or, the gas density monitoring device includes a gas density relay with an online self-checking function as described in any one of claims 1 to 28.

30. A method for calibrating a gas density relay, characterized in that: include: In normal working state, the gas density relay monitors the gas density value in the electrical equipment; The gas density relay is based on the set calibration time and gas density value, and under the conditions where the gas density relay is allowed to be calibrated: The intelligent control unit controls the adjustment speed of the pressure regulating mechanism, and / or adjusts the flow rate, so that the gas flow rate flowing to the gas density relay body through the gas flow limiting member is not enough to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, so that the gas density relay body generates a contact signal action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body; When all contact signal verification work is completed, the intelligent control unit stops the pressure regulating mechanism or restores the pressure regulating mechanism to the initial verification state.

31. A gas density relay calibration method according to claim 30, characterized in that: include: In normal working state, the gas density relay monitors the gas density value in the electrical equipment. At the same time, the gas density relay monitors the gas density value in the electrical equipment online through the gas density detection sensor and the intelligent control unit; The gas density relay is based on the set calibration time and gas density value, and under the conditions where the gas density relay is allowed to be calibrated: The online verification contact signal sampling unit is adjusted to a verification state through the intelligent control unit. In the verification state, the online verification contact signal sampling unit cuts off the contact signal control loop of the gas density relay body and connects the contacts of the gas density relay body to the intelligent control unit; The intelligent control unit controls the adjustment speed of the pressure regulating mechanism, and / or adjusts the flow rate, so that the gas flow rate flowing to the gas density relay body through the gas flow limiting member is not enough to synchronously compensate for the pressure drop of the gas density relay body regulated by the pressure regulating mechanism, thereby completing the gas pressure drop of the gas density relay body, so that the gas density relay body generates a contact signal action, and the contact action is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is in action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and completes the verification of the contact signal action value of the gas density relay body; The intelligent control unit drives or stops the pressure regulating mechanism to increase the gas pressure, so that the contacts of the gas density relay body are reset. The contact reset is transmitted to the intelligent control unit through the online verification contact signal sampling unit. The intelligent control unit obtains the gas density value according to the pressure value and temperature value when the contact is reset, or directly obtains the gas density value, detects the contact signal return value of the gas density relay body, and completes the verification of the contact signal return value of the gas density relay body. When all contact signal verification work is completed, the intelligent control unit stops the pressure regulating mechanism, or restores the pressure regulating mechanism to the initial verification state, or restores the pressure regulating mechanism to the normal working state; 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.

32. A gas density relay calibration method according to claim 30, characterized in that: include: The flow rate of the gas flow limiting member is designed to match the regulating speed and regulating flow rate of the pressure regulating mechanism; or, The flow rate of the gas flow limiting member is designed to match the regulating speed of the pressure regulating mechanism; or, The flow rate of the gas flow limiting member is designed to match the regulating flow rate of the pressure regulating mechanism; or, The intelligent control unit adjusts the adjustment speed of the pressure adjustment mechanism according to the gas flow and / or gas pressure of the gas flow limiting member; or, The intelligent control unit adjusts the adjustment speed of the pressure regulating mechanism according to the gas flow and / or gas pressure of the gas flow limiting member and / or the adjustment flow of the pressure regulating mechanism.

33. A gas density relay calibration method according to claim 30, characterized in that: include: The intelligent control unit automatically matches the adjustment speed of the pressure regulating mechanism according to the gas pressure of the gas flow limiting member during calibration; When the gas pressure is low, the adjustment speed of the pressure regulating mechanism is slow; and when the gas pressure is high, the adjustment speed of the pressure regulating mechanism is fast.

34. A method for calibrating a gas density relay according to claim 30, characterized in that: include: The inertia air chamber is connected to the air path of the gas density relay body through the first air channel, and is connected to the air path of the pressure regulating mechanism through the second air channel. The inertia air chamber is also connected to the other end of the gas flow limiting component; the inertia air chamber is a sealed air chamber configured to control the load change speed during gas pressure regulation.

35. A gas density relay calibration method according to claim 34, characterized in that: The air chamber volume of the inertial air chamber is much larger than the sum of the volumes of the air passages in other parts.

36. A gas density relay calibration method according to claim 30, characterized in that: include: The gas circuit of the pressure regulating mechanism is also sealed and connected to one end of the third gas channel through a one-way valve. The other end of the third gas channel is provided with an interface for connecting the electrical equipment. The one-way valve is used to control the gas flow of the pressure regulating mechanism to the electrical equipment.

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