CN110441195B - Gas density relay with online self-checking function and checking method thereof - Google Patents
Gas density relay with online self-checking function and checking method thereof Download PDFInfo
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- CN110441195B CN110441195B CN201910830184.7A CN201910830184A CN110441195B CN 110441195 B CN110441195 B CN 110441195B CN 201910830184 A CN201910830184 A CN 201910830184A CN 110441195 B CN110441195 B CN 110441195B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
- G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
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Abstract
The application provides a gas density relay with an online self-checking function and a checking method thereof, which are used for high-voltage and medium-voltage electrical equipment. The temperature of the temperature compensation element of the gas density relay body is regulated by the temperature regulating mechanism, so that the gas density relay body generates contact action, the contact action is transmitted to the intelligent control unit through the on-line check contact signal sampling unit, the intelligent control unit detects an alarm and/or locking contact signal action value and/or a return value of the gas density relay body according to the density value during contact action, the check work of the gas density relay is completed, the check work of the gas density relay can be completed without the need of an overhauling personnel to the site, the maintenance-free operation can be realized, the reliability of a power grid is greatly improved, the efficiency is improved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a gas density relay with an on-line self-checking function and a checking method thereof, which are applied to high-voltage and medium-voltage electric equipment.
Background
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to the power departments and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the development of economy and high speed, the capacity of the power system in China is rapidly enlarged, and the use amount of SF6 electrical equipment is increased. The SF6 gas has the functions of arc extinction and insulation in high-voltage electrical equipment, and the density reduction and micro water content of the SF6 gas in the high-voltage electrical equipment seriously affect the safe operation of the SF6 high-voltage electrical equipment if exceeding the standards: 1) The reduction of SF6 gas density to a certain extent will lead to a loss of insulation and arc extinction properties. 2) Under the participation of some metal matters, SF6 gas can be hydrolyzed with water at a high temperature of more than 200 ℃ to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a large amount of heat so as to raise the pressure of the air chamber. 3) At reduced temperatures, excessive moisture may form condensation water, significantly reducing the insulation strength of the insulator surface and even flashover, causing serious damage. The grid operating regulations therefore mandate that the density and water content of SF6 gas must be periodically checked both before and during operation of the plant.
Along with the development of the unattended transformer substation to the networking and digitalization directions and the continuous enhancement of the requirements on remote control and remote measurement, the method has important practical significance on-line monitoring of the gas density and micro water content state of SF6 electrical equipment. Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high voltage electrical equipment is very common, and for this purpose, gas density monitoring system (gas density relay) applications will be vigorously developed. Whereas current gas density monitoring systems (gas density relays) are basically: 1) The remote SF6 gas density relay is used for collecting density, pressure and temperature, uploading and on-line monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition, uploading and on-line monitoring of the density, the pressure and the temperature of the gas. SF6 gas density relay is a core and key component. However, because the field operation environment of the high-voltage transformer substation is bad, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote SF6 gas density relay consists of a mechanical density relay and an electronic remote transmission part; in addition, in the power grid system using the gas density transmitter, the traditional mechanical density relay is reserved. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can timely transmit information to a target equipment terminal through a contact connection circuit when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be timely transmitted to target equipment (such as a computer terminal) to realize online monitoring.
The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the gas density relay from happening and ensuring the safe and reliable operation of the electrical equipment. Both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the verification of the gas density relay is very important and popular in the power system at present, and various power supply companies, power plants and large factories and mines are implemented. And power supply companies, power plants and large-scale factories and mining enterprises are required to be equipped with testers, equipment vehicles and SF6 gas with high value for completing the on-site verification and detection work of the gas density relay. The method comprises the steps of roughly calculating the power failure business loss during detection, wherein the annual allocated detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the field check of the inspector is not in normal operation, potential safety hazards exist. Therefore, innovation is very necessary in the existing gas density self-checking gas density relay, especially in the gas density on-line self-checking gas density relay or system, so that the gas density relay or the monitoring system for realizing on-line monitoring of the gas density also has the checking function of the gas density relay, thereby completing the periodic checking work of the (mechanical) gas density relay, without the need of maintenance personnel to go to the site, greatly improving the working efficiency and reducing the cost.
Disclosure of Invention
The invention aims to provide a gas density relay with an online self-checking function and a checking method thereof, so as to solve the problems in the technical background.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The first aspect of the present application provides a gas density relay with an on-line self-checking function, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, a valve, an on-line check joint signal sampling unit and an intelligent control unit;
the temperature regulating mechanism is a temperature-adjustable regulating mechanism and is configured to regulate the temperature rise and fall of a temperature compensation element of the gas density relay body so that the gas density relay body generates a contact signal action;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas circuit of the gas density relay body;
the gas density detection sensor is communicated with the gas density relay body;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the valve, the temperature regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to control the valve to be closed or opened, complete the control of the temperature regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the joint signal action value and/or the joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
The second aspect of the present application provides a gas density monitoring device with an online self-checking function, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, a valve, an on-line check joint signal sampling unit and an intelligent control unit;
the temperature regulating mechanism is a temperature-adjustable regulating mechanism and is configured to regulate the temperature rise and fall of a temperature compensation element of the gas density relay body so that the gas density relay body generates a contact signal action;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas circuit of the gas density relay body;
the gas density detection sensor is communicated with the gas density relay body;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the valve, the temperature regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to control the valve to be closed or opened, complete the control of the temperature regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the joint signal action value and/or the joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
Preferably, the gas density relay or the gas density monitoring device further comprises a verification initial density setting mechanism, wherein a gas path of the verification initial density setting mechanism is communicated with a gas path of the gas density relay body; the check initial density setting mechanism and valve are configured to provide a source of gas for which a check initial density can be set or established; the intelligent control unit is connected with the verification initial density setting mechanism to complete the control of the verification initial density setting mechanism.
More preferably, the check initial density setting mechanism is sealed within a cavity or housing.
More preferably, the verification initial density setting mechanism is an air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, and the temperature change of the air in the air chamber is caused by heating the heating element and/or refrigerating the air by the refrigerating element, so that the density lifting of the air density relay is completed, and an air source capable of setting or establishing the verification initial density is provided for the air density relay; or alternatively
The verification initial density setting mechanism is a cavity with one end open, and the other end of the cavity is communicated with the gas density relay body; the piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with 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 to drive the piston to move in the cavity; or alternatively
The verification initial density setting mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or alternatively
The verification initial density setting mechanism is an air bag with one end connected with a driving component, the air bag is subjected to volume change under the driving of the driving component, and the air bag is communicated with the gas density relay body; or the initial density calibration setting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the drive of the driving part; or alternatively
The initial density checking setting mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or other deflation valves realized by an electric or gas mode; or alternatively
The verification initial density setting mechanism is a compressor; or alternatively
The verification initial density setting mechanism is a heating piece; or alternatively
The verification initial density setting mechanism is a pump, and the pump comprises, but is not limited to, one of a pressure-making pump, a booster pump, an electric air pump and an electromagnetic air pump;
Wherein the drive component includes, but is not limited to, one of a magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism, a pneumatic element.
Further, the verification initial density setting mechanism further comprises a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber.
More preferably, the gas density relay with the on-line self-checking function further comprises a multi-way joint, wherein the gas density relay body, the temperature adjusting mechanism and the checking initial density setting mechanism are arranged on the multi-way joint; or the checking initial density setting mechanism is fixed on the multi-way joint; or the gas density relay body, the gas density detection sensor and the verification initial density setting mechanism are arranged on the multi-way joint; or the temperature regulating mechanism is arranged on the multi-way joint.
Further, the gas density relay with the on-line self-checking function further comprises a first connecting pipe, and the gas path of the initial density setting mechanism is communicated with the gas density relay body through the first connecting pipe; the first interface of the multi-way joint is communicated to the position of the first connecting pipe between the gas density relay body and the verification initial density setting mechanism.
Still further, the valve is connected to the second port of the multi-way junction and is in communication with the gas density relay body through the multi-way junction.
Further, the interface of the valve communicated with the electrical equipment is communicated to the first interface of the multi-way joint; the gas density relay body is communicated with the multi-way joint through the valve; the second interface of the multi-way connector is used for connecting electrical equipment.
Further, the temperature sensor is communicated to the air path of the multi-way joint or to the third interface of the multi-way joint.
More preferably, the gas density relay with the on-line self-checking function further comprises a gas supplementing interface; the air supplementing interface is arranged on the verification initial density setting mechanism; or the air supplementing interface is arranged on the electrical equipment; or the air supplementing interface is arranged between the electrical equipment and the valve; or the air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the valve and the air passage of the initial density checking setting mechanism, or the second connecting pipe is communicated with the valve and the gas density relay body.
More preferably, at least two gas density relay bodies, at least two valves, at least two temperature adjusting mechanisms, at least two checking initial density setting mechanisms, at least two on-line checking joint signal sampling units, an intelligent control unit and a gas density detection sensor, so as to complete on-line checking of the gas density relay; or alternatively
The gas density relay comprises at least two gas density relay bodies, at least two valves, at least two temperature adjusting mechanisms, at least two checking initial density setting mechanisms, at least two on-line checking joint signal sampling units, at least two intelligent control units and a gas density detection sensor, and the on-line checking of the gas density relay is completed; or at least two gas density relay bodies, at least two valves, at least two temperature regulating mechanisms, at least two checking initial density setting mechanisms, at least two on-line checking joint signal sampling units, at least two gas density detecting sensors and an intelligent control unit, so as to finish on-line checking of the gas density relay.
Preferably, the temperature regulating mechanism is a heating element; or the temperature regulating mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; or the temperature regulating mechanism comprises a heating element and a temperature controller; or the temperature regulating mechanism comprises a heating element, a heating power regulator and a temperature controller; or the temperature regulating mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature regulating mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature regulating mechanism comprises a heating element, a controller and a temperature detector; or the temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or the temperature regulating mechanism is a miniature incubator; wherein the number of the heating elements is at least one, and the heating elements comprise, but are not limited to, one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises, but is not limited to, one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
More preferably, the heating element in the temperature regulating mechanism comprises at least two heating elements of equal or different power; or comprise heating elements with adjustable heating power.
More preferably, the positions of the heating elements in the at least two temperature adjusting mechanisms are set to be the same or different, and can be reasonably set according to the needs.
More preferably, the temperature rise and fall mode of the temperature adjustment mechanism is a multi-stage control.
Preferably, the temperature adjusting mechanism is controlled by the intelligent control unit, when the contact signal action value of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second (or the requirement is set according to the requirement) when the action value is approached, namely the temperature requirement steadily rises or falls.
Preferably, the gas density relay body includes, but is not limited to, a bi-metal strip compensated gas density relay, a gas compensated gas density relay, a bi-metal strip and a gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; a gas density relay with pointer display, a digital display type gas density relay, and a gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the gas density relay body includes: a housing, a base, a pressure detector, a temperature compensation element and a plurality of signal generators which are arranged in the housing; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a barden tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.
More preferably, the on-line check contact signal sampling unit is connected with the signal generator.
More preferably, the gas path of the verification initiation density setting mechanism is in communication with the pressure detector.
More preferably, the other end of the valve is connected to the base, the pressure detector, or the other end of the valve is connected to the gas path of the check initial density setting mechanism, thereby connecting the valve to the base, the pressure detector.
More preferably, the gas density relay body further comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display a gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with an indication display.
More preferably, the gas density relay body or the intelligent control unit further comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator; under the control of the on-line checking contact signal sampling unit, the contact signal of the gas density relay is isolated from the control loop, and the contact resistance detection unit can detect the contact resistance value of the gas density relay when the contact signal of the gas density relay acts and/or when receiving an instruction for detecting the contact resistance.
More preferably, the gas density relay body or the intelligent control unit further comprises an insulation resistance detection unit, wherein the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the on-line checking contact signal sampling unit, the contact signal of the gas density relay is isolated from the control loop, and the insulation resistance detection unit can detect the contact insulation resistance value of the gas density relay when the contact signal of the gas density relay acts and/or when receiving an instruction for detecting the contact insulation resistance.
Preferably, the gas density detection sensor is provided on the gas density relay body; or the temperature regulating mechanism is arranged on the gas density relay body; or the gas density detection sensor, the on-line check joint signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or the temperature regulating mechanism, the gas density detecting sensor, the on-line checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body.
More preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are remote transmission type gas density relays with integrated structures.
Preferably, the gas density detection sensor is an integrated structure; or the gas density detection sensor is a gas density transmitter with an integrated structure.
More preferably, the on-line check joint signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.
Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or a density detection sensor using quartz tuning fork technology.
More preferably, the pressure sensor is mounted on the gas path of the gas density relay body.
More preferably, the temperature sensor is mounted on or outside the gas path of the gas density relay body, or inside or outside the gas density relay body.
More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor; both contact and non-contact; and may be a thermal resistor and a thermocouple.
More preferably, at least one of said temperature sensors is arranged near or on or integrated in a temperature compensation element of said gas density relay body. Preferably, at least one of said temperature sensors is provided at an end of the pressure detector of said gas density relay body near the temperature compensation element.
More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.
Further, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is used for representing, the verification result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing, and the verification result is converted into the corresponding relative pressure value at 20 ℃;
When the pressure sensor is a relative pressure sensor, the pressure sensor is represented by a relative pressure value, the verification result is a corresponding relative pressure value at 20 ℃, the pressure sensor is represented by an absolute pressure value, and the verification result is converted into a corresponding absolute pressure value at 20 ℃;
The conversion relation between the absolute pressure value and the relative pressure value is as follows:
P Absolute pressure of ＝P Relative pressure +P Standard atmospheric pressure 。
Further, the pressure sensor can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil of a Bardon tube), a resistance pressure sensor (such as a pressure sensor with a slide wire resistance of the Bardon tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.
Preferably, the on-line check contact signal sampling unit and the intelligent control unit are arranged together.
More preferably, the on-line check contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the valve is an electrically operated valve.
Preferably, the valve is a solenoid valve.
More preferably, the valve is a permanent magnet solenoid valve.
Preferably, the valve is a piezoelectric valve, a temperature-controlled valve or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
Preferably, the valve is closed or opened by bending or flattening the hose.
Preferably, the valve is sealed within a cavity or housing.
Preferably, the valve and the check initiation density setting mechanism are sealed within a cavity or housing.
Preferably, pressure sensors are respectively arranged on two sides of the gas path of the valve.
Preferably, the electrical device comprises an SF6 gas electrical device, an SF6 mixed gas electrical device, an environmental protection gas electrical device, or other insulating gas electrical device.
Specifically, the electrical equipment comprises GIS, GIL, PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an air charging cabinet and a ring main unit.
Preferably, the valve communicates with the electrical device through an electrical device connection.
Preferably, the on-line checking contact signal sampling unit samples the contact signal of the gas density relay body to satisfy:
the on-line checking contact signal sampling unit is provided with at least one group of independent sampling contacts, can automatically complete checking on at least one contact at the same time, and continuously measures without replacing or reselecting the contact; wherein,
The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a lockout 1 contact + a lockout 2 contact, an alarm contact + a lockout contact + an overpressure contact.
Preferably, the on-line checking contact signal sampling unit applies a voltage of not less than 24V to the contact signal action value or the switching value of the gas density relay body, that is, when checking, a voltage of not less than 24V is applied between the corresponding terminals of the contact signal.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density by the gas density relay, namely, completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay.
More preferably, the intelligent control unit calculates the gas density value by using a mean method (average method), the mean method being: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or in a set time interval and a set temperature interval step length, carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain gas density values; or in a set time interval, setting a pressure interval step length, and carrying out average value calculation on density values corresponding to N different pressure values acquired in all pressure change ranges to obtain gas density values; wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, so as to complete on-line verification of the gas density relay; or alternatively
The intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, and converts the pressure value and the temperature value into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, a gas density value, so as to finish the online verification of the gas density relay.
Preferably, the gas density relay body is provided with a comparison density value output signal, and the comparison density value output signal is connected with the intelligent control unit; or the gas density relay body is provided with a comparison pressure value output signal, and the comparison pressure value output signal is connected with the intelligent control unit.
Preferably, the intelligent control unit is based on an embedded algorithm and a control program of the embedded system of the microprocessor, and automatically controls the whole verification process, including all peripherals, logic and input and output.
More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general purpose computer, an industrial personal computer, an ARM chip, an AI chip, CPU, MCU, FPGA, PLC and the like, an industrial control main board, an embedded main control board and the like, and comprises all peripherals, logic and input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.
More preferably, the gas density relay (or gas density monitoring device) supports the input of basic information of the gas density relay, including, but not limited to, one or more of a factory number, a precision requirement, a nominal parameter, a manufacturing plant, an operating location.
Preferably, the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode includes, but is not limited to, one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier and a cable.
Further, the wireless communication mode includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, and sonar.
Preferably, the intelligent control unit is further provided with a clock, and the clock is configured to periodically set the verification time of the gas density relay, record the test time or record the event time.
Preferably, the control of the intelligent control unit is controlled by on-site control and/or by background control.
More preferably, the gas density relay with the online self-checking function completes online checking of the gas density relay according to the setting or the instruction of the background; or alternatively
And according to the set verification time of the gas density relay, completing the on-line verification of the gas density relay.
Preferably, the gas density relay with the on-line self-checking function further comprises a self-sealing valve, wherein the self-sealing valve is arranged between the electrical equipment and the valve; or the valve is mounted between the electrical device and the self-sealing valve.
Preferably, the gas density relay with an on-line self-checking function further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays current check data in real time and/or supports data input.
Preferably, the gas density relay with an on-line self-checking function further comprises: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.
More preferably, the gas density relay with an on-line self-checking function further comprises: the gas circulation mechanism is respectively connected with the gas density relay body and the intelligent control unit and comprises a capillary tube, a sealing cavity and a heating element.
Further, the micro water sensor can be installed in a sealed chamber, a capillary tube, a capillary orifice and outside the capillary tube of the gas circulation mechanism.
Preferably, the gas density relay with the on-line self-checking function further comprises a decomposition product sensor, wherein the decomposition product sensor is respectively connected with the gas density relay body and the intelligent control unit.
Preferably, the intelligent control unit is capable of performing a depth calculation process, where the depth calculation process is: the intelligent control unit provides an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value during the check and the air pressure value of the air chamber of the electrical equipment and the air pressure-temperature characteristic; or alternatively
The depth calculation process is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value during the check, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
Preferably, the gas density relay with the on-line self-checking function further comprises a camera for monitoring.
The third aspect of the application provides a method for checking a gas density relay, comprising the following steps:
in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;
The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:
The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay, and the contact of the gas density relay body is connected to the intelligent control unit;
The temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, and after the temperature reaches a set value, the valve is closed through the intelligent control unit;
After the temperature or pressure of the gas density relay body is reduced to be proper, the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, and then the temperature of the temperature compensating element of the gas density relay body is increased, so that the gas density relay body is subjected to contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay body is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all the contact signal checking works are completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the temperature regulating mechanism.
The verification method of the gas density relay comprises the steps that the gas density relay or the gas density monitoring device further comprises a verification initial density setting mechanism, a gas path of the verification initial density setting mechanism is communicated with a gas path of the gas density relay body, and the verification initial density setting mechanism is further connected with the intelligent control unit; the verification method comprises the following steps:
in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;
The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:
The intelligent control unit is used for controlling the verification initial density setting mechanism and the valve to provide an air source with proper verification initial density for the air density relay to be verified;
the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is increased, the gas density relay body is subjected to joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during joint action, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay is completed;
after all the contact signal checking works are completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the temperature regulating mechanism.
Preferably, a method for verifying a gas density relay includes:
In a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay body, and the contact of the gas density relay body is connected to the intelligent control unit;
The intelligent control unit is used for controlling the verification initial density setting mechanism and the valve to provide an air source with proper verification initial density for the air density relay to be verified;
the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is increased, the gas density relay body is subjected to joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during joint action, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay is completed;
The temperature of the gas density relay body is reduced by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is reduced, the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value when the contact is reset, the contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay is completed;
After all the contact signal checking work is completed, the intelligent control unit opens the valve, the intelligent control unit turns off the temperature regulating mechanism, and the on-line checking contact signal sampling unit is adjusted to a working state, and the control loop of the contact signal of the gas density relay body is restored to a normal working state.
Preferably, a method for verifying a gas density relay includes:
The intelligent control unit can perform depth calculation processing, and the depth calculation processing is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay body to be checked according to the ambient temperature value during the check and the air pressure value of the air chamber of the electrical equipment and the air pressure-temperature characteristic; or alternatively
The depth calculation process is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay body to be checked according to the ambient temperature value during the check, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
Preferably, a method for verifying a gas density relay includes:
The verification initial density setting mechanism is an air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, the temperature of the air in the air chamber is changed due to heating the heating element and/or refrigerating the air by the refrigerating element, after the air chamber reaches a set value, a valve is closed by an intelligent control unit,
And further, the density lifting of the gas density relay is completed, and a gas source capable of setting or establishing the initial density is provided for the gas density relay.
Preferably, a method for verifying a gas density relay includes:
in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;
The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:
the method also comprises a checking initial density setting mechanism;
Closing the valve by an intelligent control unit;
The intelligent control unit drives the verification initial density setting mechanism to enable the gas pressure to slowly decrease, and the intelligent control unit controls the temperature adjusting mechanism to enable the temperature of the gas density relay body to rise, so that the temperature of a temperature compensating element of the gas density relay body rises, the gas density relay body generates contact action, the contact action is transmitted to the intelligent control unit through the on-line verification contact signal sampling unit, the intelligent control unit obtains the gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay body is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all the contact signal checking work is completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the heating element of the temperature regulating mechanism.
Preferably, a method for verifying a gas density relay includes:
In a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:
Closing the valve by an intelligent control unit;
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay body, and the contact of the gas density relay body is connected to the intelligent control unit;
The temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, the temperature of the temperature compensating element of the gas density relay body is increased, the verification initial density setting mechanism is driven by the intelligent control unit, the gas pressure is slowly reduced, the gas density relay body is enabled to generate contact action, the contact action is transmitted to the intelligent control unit through the on-line verification contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay body is detected, and the verification work of the contact signal action value of the gas density relay is completed;
The temperature of the gas density relay body is reduced by controlling the temperature regulating mechanism through the intelligent control unit, the temperature of the temperature compensating element of the gas density relay body is reduced, the verification initial density setting mechanism is driven by the intelligent control unit, the gas pressure is slowly increased, the gas density relay body is enabled to be subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line verification contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay body is detected, and the verification work of the contact signal return value of the gas density relay is completed;
After all the contact signal checking work is completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the heating element of the temperature regulating mechanism, and adjusts the on-line checking contact signal sampling unit to a working state, and the control loop of the contact signal of the gas density relay body resumes to operate in a normal working state.
Preferably, the contact signal includes an alarm, and/or a latch.
Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or a density detection sensor using quartz tuning fork technology.
Preferably, after the gas density relay completes verification, if an abnormality exists, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.
Preferably, the verification method further comprises: and displaying the gas density value and the verification result on site or displaying the gas density value and the verification result through a background.
Preferably, the verification method further comprises: the intelligent control unit is controlled by field control and/or by background control.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The application provides a gas density relay with an online self-checking function and a checking method thereof, which are used for high-voltage and medium-voltage electrical equipment. Closing the valve through the intelligent control unit to enable the gas density relay body to be separated from the electrical equipment on the gas path; the temperature of the temperature compensation element of the gas density relay body is regulated by the temperature regulating mechanism, so that the gas density relay body generates contact action, the contact action is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit detects an alarm and/or locking contact signal action value and/or a return value of the gas density relay body according to the density value when the contact is in action. Meanwhile, the application can also comprise a checking initial density setting mechanism, and an air source with proper checking initial density is provided for the air density relay to be checked by controlling the checking initial density setting mechanism and the valve through the intelligent control unit; the intelligent control unit is used for carrying out mutual self-check between the gas density relay body and the gas density detection sensor, so that the maintenance-free gas density relay with the online self-check function is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic diagram of a gas density relay with an on-line self-checking function according to the first embodiment;
fig. 2 is a schematic diagram of the structure of a gas density relay with an on-line self-checking function according to the second embodiment;
Fig. 3 is a schematic diagram of the structure of a gas density relay with an on-line self-checking function according to the third embodiment;
Fig. 4 is a schematic diagram of the structure of a gas density relay with an on-line self-checking function according to the fourth embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more obvious, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
As shown in fig. 1, a gas density relay with an on-line verification function includes a gas density relay body 1, the gas density relay body 1 includes: a housing 101, 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, which are provided in the housing 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, a cross beam is arranged at the other end of the temperature compensation element 104, and an adjusting piece for pushing the signal generator 109 and enabling a contact of the signal generator 109 to be connected or disconnected is arranged on the cross beam. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core of the machine 105 and is provided in front of the dial 107, the pointer 106 displaying a gas density value in conjunction with the dial 107. The gas density relay body 1 may further include a digital device or a liquid crystal device having an indication display.
In addition, the gas density relay with the on-line verification function further comprises: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature regulating mechanism 5, an on-line checking joint signal sampling unit 6, an intelligent control unit 7 and a checking initial density setting mechanism 11. The pressure sensor 2 is communicated with the pressure detector 103 on the air path; the temperature regulating mechanism 5 is arranged in the shell 101 (or on the shell 101); the on-line checking contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7; the temperature sensor 3 is arranged in the housing 101; the pressure sensor 2, the temperature sensor 3, the temperature adjusting mechanism 5, the valve 4 and the verification initial density setting mechanism 11 are respectively connected with the intelligent control unit 7. The temperature adjusting mechanism 5 mainly comprises a heating element 501 and an (insulating) fixing seat 507, and is arranged in the shell 101 (or on the shell 101). And a heat preservation piece is arranged outside or in the shell of the gas density relay body 1. The valve 4 is arranged on the joint 1010, one end of the valve 4 is provided with an interface communicated with electrical equipment, the interface is communicated with the electrical equipment, the other end of the valve 4 is communicated with the gas density relay body 1, or the other end of the valve 4 is connected with a gas path of the initial density checking setting mechanism 11, so that the valve 4 is communicated with the gas density relay body 1. The verification initial density setting mechanism 11 mainly comprises a gas chamber 1107, a heating element 1108, a heat preservation piece 1109 and a shell 1111. Specifically, the initial density calibration setting mechanism 11 is an air chamber 1107, a heating element 1108 (and/or a refrigerating element) is disposed outside or inside the air chamber 1107, and by heating the heating element 1107 (and/or refrigerating by the refrigerating element), the temperature of the air in the air chamber 1107 is changed, so as to complete the density elevation of the air density relay body, and an air source capable of setting or establishing the initial density calibration is provided for the air density relay body 1.
Wherein the signal generator 109 comprises a micro switch or a magnetically assisted electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 comprises a barden tube or a bellows; the temperature compensation element 104 employs a temperature compensation plate or a gas enclosed within a housing. The gas density relay of the present application may further include: oil-filled type density relay, oil-free type density relay, gas density gauge, gas density switch or gas pressure gauge.
In the gas density relay of the first embodiment, the pressure detector 103 is used to correct the changing pressure and temperature by the temperature compensation element 104 to reflect the change of sulfur hexafluoride gas density. Under the pressure of sulfur hexafluoride (SF 6) gas as a medium to be measured, the temperature compensation element 104 is used, when the sulfur hexafluoride gas density value is changed, the sulfur hexafluoride gas pressure value is correspondingly changed, the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by the aid of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106 again, and then the measured sulfur hexafluoride gas density value is indicated on the dial 107. The signal generator 109 acts as an output alarm lockout contact. Thus, the gas density relay body 1 can display the sulfur hexafluoride gas density value. If the gas leaks, the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding downward displacement, the downward displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106 again, the pointer 106 moves towards the direction with small indication value, and the gas leakage degree is specifically displayed on the dial 107; meanwhile, the pressure detector 103 drives the cross beam to move downwards through the temperature compensation element 104, the adjusting piece on the cross beam is gradually separated from the signal generator 109, and when the contact of the signal generator 109 is switched on to a certain extent, a corresponding contact signal (alarm or locking) is sent out, so that sulfur hexafluoride gas density in equipment such as an electric switch is monitored and controlled, and the electric equipment can work safely.
If the gas density value increases, that is, if the sulfur hexafluoride gas pressure value in the sealed gas chamber is greater than the set sulfur hexafluoride gas pressure value, the pressure value correspondingly increases, the end of the pressure detector 103 and the temperature compensation element 104 generate corresponding upward displacement, the temperature compensation element 104 also makes the cross beam move upward, the adjusting element on the cross beam moves upward and pushes the contact of the signal generator 109 to open, and the contact signal (alarm or locking) is released.
The temperature regulating mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature regulating mechanism mainly comprises a heating element and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a heating power regulator and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or the temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or the temperature regulating mechanism is a miniature incubator; wherein the heating element comprises, but is not limited to, one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the heating element consists of a plurality of heating element groups; the controller includes, but is not limited to, one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller, and a PLC controller.
Type of pressure sensor 2: the pressure sensor 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 a plurality. The pressure sensor may be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip type pressure sensor, a coil-induced pressure sensor (e.g., a baron tube with an induction coil pressure measurement sensor), a resistive pressure sensor (e.g., a baron tube with a sliding wire resistance pressure measurement sensor). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure acquisition is a pressure sensor, a pressure transducer, or other various pressure sensing elements, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistive strain gauge, ceramic strain gauge).
The temperature sensor 3 may be: thermocouple, thermistor, semiconductor type; both contact and non-contact; and may be a thermal resistor and a thermocouple. In short, various temperature sensing elements such as a temperature sensor and a temperature transmitter can be used for temperature acquisition.
The on-line checking contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the on-line check contact signal sampling unit 6 are: 1) The safety operation of the electrical equipment is not affected during verification. When the contact signal of the gas density relay body 1 acts during verification, the safe operation of the electrical equipment is not affected; 2) The contact signal control loop of the gas density relay body 1 does not affect the performance of the gas density relay, particularly the performance of the intelligent control unit 7, and the gas density relay is not damaged or the testing work is not affected.
The basic requirements or functions of the intelligent control unit 7 are: control and signal acquisition of the temperature regulating mechanism 5 (even the valve 4, the check initial density setting mechanism 11) is completed by the intelligent control unit 7. The realization is as follows: the pressure value and the temperature value when the contact signal of the gas density relay body 1 acts can be detected and converted into the corresponding pressure value P 20 (density value) at 20 ℃, namely the contact action value P D20 of the gas density relay body 1 can be detected, and the verification work of the gas density relay body 1 is completed. Or the density value P D20 when the contact signal of the gas density relay body 1 acts can be directly detected, and the verification work of the gas density relay body 1 is completed. Meanwhile, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay body 1, so that maintenance-free operation is realized.
Of course, the intelligent control unit 7 may also implement: completing test data storage; and/or test data derivation; and/or the test data is printable; and/or can carry out data communication with an upper computer; and/or analog quantity, digital quantity information may be entered. The intelligent control unit 7 further comprises a communication module, and the communication module is used for realizing remote transmission of information such as test data and/or verification results; when the rated pressure value of the gas density relay body 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the rated pressure value of the gas density relay body 1 is verified.
Electrical equipment, including SF6 gas electrical equipment, SF6 gas mixture electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment. Specifically, the electrical devices include GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas tanks, ring main units, and the like.
The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the temperature regulating mechanism 5, the valve 4, the initial density checking setting mechanism 11, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 can be flexibly arranged according to the needs. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; or the gas density relay body 1 and the temperature adjusting mechanism 5 may be provided together; in general, the arrangement between them can be suitably flexibly arranged and combined. The intelligent control device can be flexibly arranged among the gas density relay body, the gas density detection sensor, the temperature regulating mechanism, the on-line check contact signal sampling unit and the intelligent control unit according to requirements.
The gas density relay checksum monitoring working principle with the online checking function of the embodiment is as follows:
The intelligent control unit 7 monitors the gas pressure and the gas temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P 20 (namely a gas density value). When the density relay body 1 is required or/and checked, if the gas density value P 20 is more than or equal to the set safety check density value P S; the gas density relay sends out an instruction, namely, the control loop of the gas density relay body 1 is disconnected through the intelligent control unit 7, so that the safety operation of the electrical equipment is not affected when the gas density relay body 1 is checked on line, and an alarm signal is not sent out by mistake or the control loop is locked when the gas density relay body 1 is checked. Because the gas density relay is monitored and judged before starting the verification, the gas density value P 20 is more than or equal to the set safety verification density value P S, the gas of the electrical equipment is in the safety operation range, moreover, the gas leakage is a slow process, and the verification is safe. Meanwhile, the intelligent control unit 7 is communicated with the contact sampling circuit of the gas density relay body 1, then the heating element 1107 is heated through the control of the intelligent control unit 7 on the verification initial density setting mechanism 11, the temperature of the gas in the gas chamber 1107 is changed, the density lifting of the gas density relay is further completed, after the set value is reached, the intelligent control unit 7 controls the valve 4, closes the valve 4, and simultaneously turns off the heating element 1107. The temperature of the gas in the gas chamber 1107 is reduced, and the pressure of the gas in the gas chamber 1107 is also reduced, so that a gas source suitable for checking the initial density (pressure) can be provided for the gas density relay body 1 to be checked. Then, the intelligent control unit 7 operates or controls the temperature adjusting mechanism 5 to raise the temperature of the gas density relay body 1, and further raise the temperature of the temperature compensating element of the density relay, and the temperature change speed is not more than 1.0 ℃ per second (even not more than 0.5 ℃ per second) when approaching the contact action value, or the requirement is set according to the requirement), namely the temperature requirement is steadily raised or lowered. Until the gas density relay body 1 generates a contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 directly obtains the gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, detects the contact signal action value of the gas density relay, and completes the checking work of the contact signal action value of the gas density relay. For example, for a gas density relay with a density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the gas source with proper initial density (pressure) is checked, that is, the gas pressure of the gas chamber 1107 is 0.5562MPa (relative pressure), the pressure value is unchanged in the checking system, when the temperature rises to 29.5 ℃, the alarm contact point acts, the intelligent control unit 7 can obtain the alarm contact point action value 0.5317MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value 29.5 ℃ when the contact point acts, and the intelligent control unit 7 can obtain the error of the alarm contact point action value: 0.0117MPa (0.5317 MPa-0.52 MPa=0.0117 MPa), and the verification of the alarm contact action value of the density relay is completed.
Through the operation or control of the intelligent control unit 7 to the temperature regulating mechanism 5, the heating element of the temperature regulating mechanism 5 is turned off, so that the temperature of the gas density relay body 1 is reduced, and then the temperature of the temperature compensating element of the gas density relay body 1 is reduced, the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit 7 through the contact signal sampling unit 6, the intelligent control unit 7 obtains the gas density value according to the pressure value and the temperature value during contact reset, or directly obtains the gas density value, the contact signal return value of the gas density relay is detected, and the verification work of the contact signal return value of the gas density relay is completed. For example, for the above-mentioned density relay with the density relay parameter of 0.6/0.52/0.50MPa (rated value of 0.6 MPa/alarm pressure value of 0.52 MPa/alarm pressure value of 0.50MPa, relative pressure), when the gas source with proper initial density (pressure) is checked, i.e. the gas pressure of the gas chamber 1107 is 0.5562MPa (relative pressure), the pressure value is unchanged (or slightly changed) in the checking system, when the temperature is reduced to 24.8 ℃, the alarm contact point of the gas source is reset, the intelligent control unit 7 can obtain the alarm contact point return value 0.5435MPa (relative pressure) of the gas density relay according to the pressure value 0.5562MPa (relative pressure) and the temperature value 24.8 ℃ when the temperature is reduced, and the intelligent control unit 7 can obtain the switching difference of the alarm contact point: 0.0118MPa (0.5435 MPa-0.5317 MPa=0.0118 MPa), thus the verification of the alarm contact action value of the density relay is basically completed. The intelligent control unit 7 can judge the performance condition (such as pass or fail) of the gas density relay to be checked according to the requirement and the check result (check data). The verification is repeated a plurality of times (for example, 2 to 3 times) and then the average value is calculated, thus completing the verification work of the gas density relay body 1. Then, the intelligent control unit opens the valve, and the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time, the contact of the gas density relay body 1 is disconnected with the intelligent control unit 7. Meanwhile, the heating element of the temperature regulating mechanism is turned off through the intelligent control unit 7, the on-line checking contact signal sampling unit is adjusted to be in a working state, and the control loop of the contact signal of the gas density relay is restored to be in a normal working state. Namely, the intelligent control unit 7 is communicated with the control loop of the gas density relay body 1, the density monitoring loop of the gas density relay body 1 works normally, and the gas density relay body 1 monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Thus, the online checking work of the gas density relay body 1 is conveniently completed, and the safety operation of the electrical equipment is not influenced when the gas density relay body 1 is checked online.
When the gas density relay body 1 completes the verification work, the gas density relay (or the gas density monitoring device) determines, and the detection result can be notified. The mode is flexible, and specifically can: 1) The gas density relay may be in-situ annunciated, for example, by an indicator light, a digital code, or a liquid crystal display; 2) Or the gas density relay (or the gas density monitoring device) can be uploaded in an online remote communication mode, for example, the gas density relay (or the gas density monitoring device) can be uploaded to the background of an online monitoring system; 3) Or uploading to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) Or uploaded by another route; 5) Or uploading the abnormal result through an alarm signal line or a special signal line; 6) Alone or in combination with other signal bundles. In short, after the gas density relay (or the gas density monitoring device) completes the online checking work of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the gas density relay can be uploaded to a far end or can be sent to a designated receiver, such as a mobile phone. Or after the gas density relay finishes the verification work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit 7 can upload remote ends (a monitoring room, a background monitoring platform and the like) through the alarm contact signals of the gas density relay body 1, and can also display a notice on site. The gas density relay of the simple version is checked on line, and the result of checking abnormality can be uploaded through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with the alarm signal contact, and the alarm signal contact is regularly closed and opened, so that the situation can be obtained through analysis; or uploaded through a separate verification signal line. The method can be used for uploading states well or problems, or uploading through remote transmission density on-line monitoring, or uploading a verification result through a single verification signal line, or uploading through on-site display, on-site alarm or uploading through wireless uploading, and networking with a smart phone. The communication mode is wired or wireless, and 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 and the like; 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, a 5G/NB-IOT communication module (such as NB-IOT) built in a sensor, and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and multiple combinations.
The gas density relay has a safety protection function, and particularly when the gas density relay is lower than a set value, the gas density relay automatically performs no on-line verification on the density relay and sends out a notification signal. For example, when the gas density value of the apparatus is less than the set value P S, it is not verified. For example: only when the gas density value of the equipment is more than or equal to (the alarm pressure value is +0.02MPa), the on-line verification can be performed.
The gas density relay can perform online verification according to a set time, and can also perform online verification according to a set temperature (such as a limit high temperature, a limit low temperature, a normal temperature, 20 ℃ and the like). When the high temperature, low temperature, normal temperature and 20 ℃ environment temperature are checked online, the error judgment requirements are different, for example, when the 20 ℃ environment temperature is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and the accuracy requirement can be 2.5 level at high temperature. And can be implemented according to the related standard according to the temperature requirement. For example, according to the specification of 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the precision requirement corresponding to each temperature value is required.
The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods according to the density relay. That is, the gas density relay and the electric device performance are judged by comparing the gas density relay and the electric device in the same temperature range at different periods. The comparison of each period of the history and the comparison of the history and the current.
The gas density relay may be repeatedly checked a plurality of times (for example, 2 to 3 times), and the average value thereof is calculated based on the result of each check. If necessary, the gas density relay can be checked on line at any time.
Meanwhile, the density relay can also monitor the gas density value, and/or the pressure value and/or the temperature value of the electrical equipment on line and upload the gas density value and/or the pressure value and/or the temperature value to the target equipment to realize on-line monitoring.
Embodiment two:
As shown in fig. 2, a gas density relay or a gas density monitoring device with an on-line self-checking function according to a second embodiment of the present invention includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature regulating mechanism 5, an on-line checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a gas supplementing interface 10 and a checking initial density setting mechanism 11. One end of the valve 4 is connected to an electrical device 8 in a sealing manner, and the other end of the valve 4 is connected to a multi-way connection 9. The gas density relay body 1 is arranged on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1, and the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the temperature regulating mechanism 5 is arranged on the density relay body 1; the temperature adjusting mechanism 5 mainly comprises a heating element 501, a heat preservation piece 502, a shell 503 and a controller 504, wherein the heating element 501 is controlled by the intelligent control unit 7, i.e. the controller 504 of the heating element 501 is arranged or designed together with the intelligent control unit 7. The checking initial density setting mechanism 11 is arranged on the multi-way joint 9, and the checking initial density setting mechanism 11 is communicated with the gas density relay body 1; the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4, the temperature adjusting mechanism 5 and the verification initial density setting mechanism 11 are respectively connected with the intelligent control unit 7. The air supplementing interface 10 is communicated with the multi-way joint 9.
The working principle is as follows: the on-line checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the on-line checking contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay body 1, and the contact of the gas density relay body 1 is connected to the intelligent control unit 7; then, the intelligent control unit 7 controls the verification initial density setting mechanism 11 to heat the heating element 1107, so that the temperature of the gas in the gas chamber 1107 changes, the density of the gas density relay is further lifted, after the set value is reached, the intelligent control unit 7 controls the valve 4, closes the valve 4, and simultaneously turns off the heating element 1107. The temperature of the gas in the gas chamber 1107 is reduced, and the pressure of the gas in the gas chamber 1107 is also reduced, so that a gas source suitable for checking the initial density (pressure) can be provided for the gas density relay body 1 to be checked. Then, the temperature of the gas density relay body 1 is increased by the operation or control of the intelligent control unit 7 on the temperature regulating mechanism 5, and then the temperature of the temperature compensating element of the density relay body 1 is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to the pressure value and the temperature value when the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed. The intelligent control unit 7 further comprises a depth calculation unit, wherein the depth calculation unit can provide an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value, the gas density value or the pressure value of the electrical equipment and the gas pressure-temperature characteristic; or the intelligent control unit can provide an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value during the check, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
Then, the temperature of the gas density relay body 1 is reduced by the operation or control of the intelligent control unit 7 on the temperature regulating mechanism 5, and then the temperature of the temperature compensating element of the density relay is reduced, so that the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to the pressure value and the temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is completed.
After all the contact signal checking work is completed, the intelligent control unit opens the valve, meanwhile, the intelligent control unit 7 turns off the heating element of the temperature regulating mechanism, and adjusts the on-line checking contact signal sampling unit 6 to a working state, and the control loop of the contact signal of the gas density relay resumes to operate in a normal working state. In this embodiment, the intelligent control unit 7 opens the valve 4, or the intelligent control unit 7 turns off the heating element of the temperature adjusting mechanism, so that the operation can be flexible sequentially, i.e. the valve 4 can be opened first, and then the heating element of the temperature adjusting mechanism can be turned off; or the heating element of the temperature regulating mechanism can be turned off first, and then the valve 4 is opened; or may operate simultaneously.
Embodiment III:
The third embodiment of the invention provides a gas density relay or a density monitoring device with an online self-checking function, which comprises: the gas density relay comprises a gas density relay body 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a temperature regulating mechanism 5, an on-line checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a gas supplementing interface 10 and a checking initial density setting mechanism 11. One end of the self-sealing valve is connected to the electrical equipment in a sealing way, and the other end of the self-sealing valve is connected with the multi-way joint 9 through the valve 4. The gas density relay body 1, the second pressure sensor 22, the second temperature sensor 32, the temperature adjusting mechanism 5 and the gas supplementing interface 10 are arranged on the multi-way joint 9; the first pressure sensor 21 and the first temperature sensor 31 are provided on the gas density relay body 1. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are respectively connected with the intelligent control unit 7. The first pressure sensor 21, the second pressure sensor 22 and the gas density relay body 1 are communicated on a gas path.
Unlike the first embodiment, the two pressure sensors are respectively a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The present embodiment provides a plurality of pressure sensors and temperature sensors with the purpose of: the pressure values obtained by monitoring the first pressure sensor 21 and the second pressure sensor 22 can be compared and mutually verified; the temperature values obtained by monitoring the first temperature sensor 31 and the second temperature sensor 32 can be compared and checked with each other; the density values P1 20 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31 are compared with the density values P2 20 obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32, and the density values P2 20 are checked mutually; even the density values Pe 20 of the rated value of the gas density relay body 1 can be obtained through on-line verification, and the density values Pe 20 can be compared with each other and verified with each other.
In the technology of the present invention, there are two pressure sensors, namely, a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The first pressure sensor 21 and the second pressure sensor 22 are provided on both sides of the multi-way joint 9 or on both ends of the valve 4, respectively. The technology of the invention has the safety protection function, and specifically comprises the following steps: 1) When the density value obtained by monitoring by the first pressure sensor 21 and the first temperature sensor 31 or the second pressure sensor 22 and the second temperature sensor 32 is lower than the set value, the gas density relay automatically does not verify the gas density relay body 1 any more and sends out a notification signal. For example, when the gas density value of the apparatus is less than the set value, it is not verified. Only when the gas density value of the equipment is more than or equal to (locking pressure +0.02MPa), the verification can be performed. The opposite point is alarmed to have a status indication. 2) Or at the time of verification, when the valve 4 is closed and the density value obtained by monitoring by the second pressure sensor 22 and the second temperature sensor 32 is lower than the set value, the gas density relay automatically stops verifying the gas density relay body 1 and simultaneously sends out a notification signal (gas leakage). For example, when the gas density value of the apparatus is less than the set value (latch pressure +0.02 MPa), it is not verified. The set value can be arbitrarily set as required. Meanwhile, the gas density relay is also provided with a plurality of pressure sensors and temperature sensors for mutual calibration, and the mutual calibration of the sensors and the gas density relay ensures that the gas density relay works normally. Namely, the pressure values obtained by monitoring by the first pressure sensor 21 and the second pressure sensor 22 are compared and mutually checked; the temperature values obtained by monitoring the first temperature sensor 31 and the second temperature sensor 32 are compared and checked mutually; the density values P1 20 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31 are compared with the density values P2 20 obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32, and the density values P2 20 are checked mutually; even the density values Pe 20 of the rated values of the gas density relay body 1 can be obtained through verification, and the density values Pe 20 can be compared with each other and verified with each other.
Still other embodiments are not listed here.
Embodiment four:
The fourth embodiment of the invention provides a gas density relay with an online self-checking function, which comprises: heating device 1108 is also included in this embodiment; one end of the valve 4 is connected with the connector 1010 (the connector 1010 is communicated with electrical equipment), the other end of the valve 4 is communicated with the gas density relay body 1, and the valve 4 is connected with the intelligent control unit 7; the heating device 1108 is arranged on a connecting pipe 1011 of the gas density relay, and the inside of the connecting pipe 1011 is hollow; the heating device is connected with the intelligent control unit 7; a heat preservation piece 1109 is arranged outside the heating device 1108; according to the set verification time or/and verification command and the gas density value condition or/and temperature value condition, under the condition that the gas density relay is allowed or/and verifiable:
The contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay body 1, and the contact of the gas density relay body 1 is connected to the intelligent control unit 7; heating the heating device 1108 by the intelligent control unit 7, so that the temperature of the gas in the gas chamber inside the connecting pipe 1011 between the valve 4 and the gas density relay body 1 is changed, after the temperature reaches a set value (for example, the set value temperature is 70 ℃), closing the valve 4 by the intelligent control unit 7, and then closing the heating device 1108 by the intelligent control unit 7; after the temperature or pressure of the air chamber inside the connecting pipe 1011 is reduced to a proper temperature (for example, the ambient temperature is minus 10 ℃), the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism 5 through the intelligent control unit 7, and then the temperature of the temperature compensating element of the gas density relay body 1 is increased (the height is assumed to be 38.5 ℃), so that the gas density relay body 1 generates a contact action, the contact action is transmitted to the intelligent control unit 7 through the contact signal sampling unit 6, the intelligent control unit 7 obtains the gas density value according to the pressure value and the temperature value when the contact is operated, or directly obtains the gas density value, and the contact signal action value of the gas density relay body is detected to finish the verification work of the contact signal action value of the gas density relay; after all the contact signal verification works are completed, the intelligent control unit 7 opens the valve 4, and the intelligent control unit 7 turns off the temperature adjusting mechanism 5.
A gas density relay with an on-line self-checking function generally refers to a gas density relay with its constituent elements designed into an integral structure; the gas density monitoring device generally refers to the design of the constituent elements into a separate structure and flexible composition.
In summary, the gas density relay with the on-line self-checking function and the checking method thereof provided by the invention are composed of a gas path (through a pipeline) connecting part, a temperature adjusting part (even including a pressure adjusting part), a signal measurement control part and the like, and have the main functions of performing on-line checking measurement on a contact signal (a pressure value during alarm/locking action) of the gas density relay at the ambient temperature, automatically converting the contact signal into a corresponding pressure value at 20 ℃, and performing on-line performance detection on the contact (alarm and locking) value of the gas density relay. The mounting positions of the gas density relay, the pressure sensor, the temperature regulating mechanism, the initial density checking setting mechanism, the valve, the on-line checking joint signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay body, the pressure sensor, the temperature sensor, the on-line checking joint signal sampling unit and the intelligent control unit can be combined together, and can be designed integrally or in a split mode; can be arranged on the shell or the multi-way joint, and can also be connected together through a connecting pipe. The valve may be connected directly to the electrical device or may be connected through a self-sealing valve or a gas line. The pressure sensor, the temperature sensor, the on-line checking joint signal sampling unit and the intelligent control unit can be combined together to be integrally designed; the pressure sensor and the temperature sensor can be combined together and designed integrally; the on-line checking contact signal sampling unit and the intelligent control unit can be combined together to realize integrated design. In short, the structure is not limited to a single cell. The gas density relay body or the gas density monitoring device comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator and is used for detecting the contact resistance value of the contact of the gas density relay.
When the gas density relay with the on-line self-checking function checks the contact points of the gas density relay at high temperature, low temperature, normal temperature and 20 ℃ environment temperature, the error judgment requirements can be different, and the gas density relay can be implemented according to the temperature requirements and the related standards; the comparison of the error performance of the density relay can be performed at different temperatures and for different time periods. I.e., at different times, in the same temperature range, a determination is made as to the performance of the density relay. The comparison of each period of the history and the comparison of the history and the current. Physical examination can also be performed on the density relay body. When necessary, the density relay contact signals can be checked at any time; a determination is made as to whether the density value of the monitored electrical device is normal or not with the gas density relay body. The density value, the gas density relay body, the pressure sensor and the temperature sensor of the electrical equipment can be judged, analyzed and compared normally and abnormally, so that the states of the electrical equipment such as gas density monitoring, the density relay body and the like are judged, compared and analyzed; the contact signal state of the gas density relay is also monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the device is opened or closed, so that one layer of monitoring is added, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; the insulating property of the gas density relay body is also detected, or detected and judged. In addition, for SF6 gas, the specific conversion method of SF6 gas pressure-temperature characteristics can be calculated according to Betty-Bridgman equation; for SF6 mixed gas, the specific conversion method of the pressure-temperature characteristics of the SF6 mixed gas can be calculated according to the Dalton partial pressure law, betty-Bridgman equation and ideal gas state equation. The temperature regulating mechanism is arranged in or outside the shell of the gas density relay and is arranged on the shell. The communication equipment is arranged inside or outside the shell of the gas density relay, and the mode of the communication equipment can be flexibly set according to the needs. The temperature sensor may be digital or analog. The signal generator comprises, but is not limited to, a micro switch, a magnetic-assisted electric contact, a reed switch and a miniature switch, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes, but is not limited to, a barden tube, a bellows + spring, a pressure sensor; the temperature compensation element comprises a temperature compensation sheet, gas sealed in the shell, and gas sealed in the temperature compensation sheet and the shell.
The application has compact and reasonable structural arrangement, good rust prevention and vibration prevention capability of each part, firm installation and reliable use. The connection and disassembly of each pipeline of the gas density relay are easy to operate, and equipment and parts are convenient to maintain. The application can complete the verification work of the gas density relay without the need of overhauling personnel on site, thereby greatly improving the reliability of the power grid, improving the efficiency and reducing the cost.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (52)
1. A gas density relay with on-line self-verification function, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, a valve, an on-line check joint signal sampling unit and an intelligent control unit;
The temperature regulating mechanism is a temperature-adjustable regulating mechanism, is arranged in or outside the gas density relay body and is configured to regulate the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal actions;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas circuit of the gas density relay body;
the gas density detection sensor is communicated with the gas density relay body;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the valve, the temperature regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to control the valve to be closed or opened, complete the control of the temperature regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the joint signal action value and/or the joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
2. The gas density relay of claim 1, further comprising a check initial density setting mechanism, a gas path of the check initial density setting mechanism in communication with a gas path of the gas density relay body; the check initial density setting mechanism and valve are configured to provide a gas source for which a check initial density can be set or established; the intelligent control unit is connected with the verification initial density setting mechanism to complete the control of the verification initial density setting mechanism.
3. The gas density relay of claim 2, wherein: the verification initial density setting mechanism is an air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, the temperature of air in the air chamber is changed due to heating by the heating element and/or refrigerating by the refrigerating element, and further the density lifting of the air density relay is completed, and an air source capable of setting or establishing the verification initial density is provided for the air density relay; or alternatively
The verification initial density setting mechanism is a cavity with one end open, and the other end of the cavity is communicated with the gas density relay body; the piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with 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 to drive the piston to move in the cavity; or alternatively
The verification initial density setting mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or alternatively
The verification initial density setting mechanism is an air bag with one end connected with a driving component, the air bag is subjected to volume change under the driving of the driving component, and the air bag is communicated with the gas density relay body; or alternatively
The verification initial density setting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the drive of the driving part; or alternatively
The initial density checking setting mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or other deflation valves realized by an electric or gas mode; or alternatively
The verification initial density setting mechanism is a compressor; or alternatively
The verification initial density setting mechanism is a heating piece; or alternatively
The verification initial density setting mechanism is a pump, and the pump comprises one of a pressure-making pump, a booster pump, an electric air pump and an electromagnetic air pump;
Wherein the driving part comprises one of magnetic force, a motor, a reciprocating mechanism, a Carnot circulation mechanism and a pneumatic element.
4. A gas density relay according to claim 3, wherein: the verification initial density setting mechanism further comprises a heat preservation piece, and the heat preservation piece is arranged outside the closed air chamber.
5. The gas density relay of claim 2, wherein: the verification initial density setting mechanism is sealed in a cavity or a shell.
6. The gas density relay of claim 2, wherein: the check initial density setting mechanism and the valve are sealed within a cavity or housing.
7. The gas density relay of claim 2, further comprising: the gas density relay body, the temperature adjusting mechanism and the verification initial density setting mechanism are arranged on the multi-way joint; or alternatively
The checking initial density setting mechanism is fixed on the multi-way joint; or alternatively
The gas density relay body, the gas density detection sensor and the verification initial density setting mechanism are arranged on the multi-way joint; or alternatively
The temperature adjusting mechanism is arranged on the multi-way joint.
8. The gas density relay of claim 7, wherein: the gas circuit of the verification initial density setting mechanism is communicated with the gas density relay body through the first connecting pipe; the first interface of the multi-way joint is communicated to the position of the first connecting pipe between the gas density relay body and the verification initial density setting mechanism.
9. The gas density relay of claim 8, wherein: the valve is connected to the second port of the multi-way junction and is in communication with the gas density relay body through the multi-way junction.
10. The gas density relay of claim 7, wherein: a port through which the valve communicates with an electrical device, a first port through which the multi-way connector communicates; the gas density relay body is communicated with the multi-way joint through the valve; the second interface of the multi-way connector is used for connecting electrical equipment.
11. The gas density relay of claim 2, further comprising: an air supplementing interface;
The air supplementing interface is arranged on the verification initial density setting mechanism; or alternatively
The air supplementing interface is arranged on the electrical equipment; or alternatively
The air supplementing interface is arranged between the electrical equipment and the valve; or alternatively
The air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the valve and an air path of the initial density checking setting mechanism, or the second connecting pipe is communicated with the valve and the gas density relay body.
12. The gas density relay according to claim 2, wherein at least two gas density relay bodies, at least two valves, at least two temperature adjustment mechanisms, at least two calibration initiation density setting mechanisms, at least two on-line calibration contact signal sampling units, an intelligent control unit and a gas density detection sensor, accomplish on-line calibration of the gas density relay; or alternatively
The gas density relay comprises at least two gas density relay bodies, at least two valves, at least two temperature adjusting mechanisms, at least two checking initial density setting mechanisms, at least two on-line checking joint signal sampling units, at least two intelligent control units and a gas density detection sensor, and the on-line checking of the gas density relay is completed; or alternatively
The gas density relay comprises at least two gas density relay bodies, at least two valves, at least two temperature adjusting mechanisms, at least two checking initial density setting mechanisms, at least two on-line checking joint signal sampling units, at least two gas density detecting sensors and an intelligent control unit, and the on-line checking of the gas density relay is completed.
13. A gas density relay according to claim 1, wherein,
The temperature regulating mechanism consists of a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; or alternatively
The temperature regulating mechanism consists of a heating element and a temperature controller; or alternatively
The temperature regulating mechanism consists of a heating element, a heating power regulator and a temperature controller; or alternatively
The temperature regulating mechanism consists of a heating element, a refrigerating element, a power regulator and a temperature controller; or alternatively
The temperature regulating mechanism consists of a heating element, a heating power regulator and a constant temperature controller; or alternatively
The temperature regulating mechanism consists of a heating element, a controller and a temperature detector; or alternatively
The temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or alternatively
The temperature regulating mechanism is a miniature incubator;
The heating elements comprise at least one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor;
The temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and comprises one of a PID controller, a controller combining PID with fuzzy control, a variable frequency controller and a PLC controller.
14. The gas density relay of claim 13, wherein the heating element in the temperature adjustment mechanism comprises at least two heating elements of equal or unequal power; or comprise heating elements with adjustable heating power.
15. The gas density relay of claim 13, wherein the positions of the heating elements in the at least two temperature adjustment mechanisms are set to be the same or different.
16. The gas density relay of claim 13, wherein the temperature rise and fall of the temperature adjustment mechanism is controlled in multiple stages.
17. The gas density relay of claim 1, wherein the gas density relay body comprises: a housing, a base, a pressure detector, a temperature compensation element and a plurality of signal generators which are arranged in the housing; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a barden tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.
18. The gas density relay of claim 17, wherein: the gas density relay body further comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display a gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with indication display.
19. The gas density relay of claim 17, wherein: the gas density relay body or the intelligent control unit further comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator; under the control of the on-line checking contact signal sampling unit, the contact signal of the gas density relay is isolated from the control loop, and the contact resistance detection unit can detect the contact resistance value of the gas density relay when the contact signal of the gas density relay acts and/or when receiving an instruction for detecting the contact resistance.
20. The gas density relay of claim 1, wherein: the gas density detection sensor is arranged on the gas density relay body; or alternatively
The gas density detection sensor, the on-line check joint signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or alternatively
The temperature regulating mechanism, the gas density detecting sensor, the on-line checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body.
21. The gas density relay of claim 20, wherein: the gas density relay body and the gas density detection sensor are of an integrated structure.
22. The gas density relay of claim 21, wherein: the gas density relay body and the gas density detection sensor are of an integrated remote transmission type gas density relay.
23. The gas density relay of claim 1, wherein: the gas density detection sensor is of an integrated structure.
24. The gas density relay of claim 23, wherein: the gas density detection sensor is a gas density transmitter with an integrated structure.
25. The gas density relay of claim 24, wherein: the on-line checking joint signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.
26. The gas density relay of claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or alternatively
A gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or alternatively
A density detection sensor using quartz tuning fork technology.
27. The gas density relay of claim 26, wherein: the pressure sensor is arranged on the gas path of the gas density relay body;
The temperature sensor is arranged on the gas path or outside the gas path of the gas density relay body, or near the temperature compensation element in the gas density relay body, or outside the gas density relay body.
28. The gas density relay of claim 26, wherein: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.
29. The gas density relay of claim 1, wherein: the on-line checking joint signal sampling unit and the intelligent control unit are arranged together.
30. The gas density relay of claim 29, wherein: the on-line checking joint signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
31. The gas density relay of claim 1, wherein: the valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
32. The gas density relay of claim 1, wherein: the valve is sealed within a cavity or housing.
33. The gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit samples the contact signal of the gas density relay body to satisfy the following conditions:
the on-line checking contact signal sampling unit is provided with at least one group of independent sampling contacts, can automatically complete checking on at least one contact at the same time, and continuously measures without replacing or reselecting the contact; wherein,
The contacts comprise one of an alarm contact, a locking contact, an alarm contact, a locking 1 contact, a locking 2 contact, an alarm contact, a locking contact and an overpressure contact.
34. The gas density relay of claim 1, wherein: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay.
35. The gas density relay of claim 34, wherein the intelligent control unit calculates the gas density value using a mean method of: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or alternatively
In a set time interval and a set temperature interval step length, carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain gas density values; or alternatively
In a set time interval, setting a pressure interval step length, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in all pressure variation ranges to obtain gas density values;
wherein N is a positive integer greater than or equal to 1.
36. The gas density relay of claim 1, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, so that the on-line verification of the gas density relay is completed; or alternatively
The intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, and converts the pressure value and the temperature value into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, a gas density value, so as to finish the online verification of the gas density relay.
37. The gas density relay of claim 1, wherein: the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or alternatively
The gas density relay body is provided with a comparison pressure value output signal which is connected with the intelligent control unit.
38. The gas density relay of claim 1, wherein: the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.
39. The gas density relay according to claim 1, wherein the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.
40. The gas density relay of claim 1, wherein: the intelligent control unit is also provided with a clock, and the clock is configured to be used for periodically setting the verification time of the gas density relay, recording the test time or recording the event time.
41. The gas density relay of claim 1, wherein: the intelligent control unit is controlled by field control and/or by background control.
42. The gas density relay of claim 1, further comprising: a self-sealing valve mounted between the electrical device and the valve; or the valve is mounted between the electrical device and the self-sealing valve.
43. The gas density relay of claim 1, further comprising: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays current check data in real time and/or supports data input.
44. The gas density relay of claim 1, further comprising: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit, and/or the decomposer sensor is respectively connected with the gas density relay body and the intelligent control unit.
45. The gas density relay of claim 1, wherein the intelligent control unit is capable of performing a depth calculation process, the depth calculation process being: the intelligent control unit provides an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value during the check and the air pressure value of the air chamber of the electrical equipment and the air pressure-temperature characteristic; or alternatively
The depth calculation process is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay to be checked according to the ambient temperature value during the check, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
46. The gas density relay according to claim 1, wherein the temperature regulating mechanism is controlled by the intelligent control unit, and when the contact signal action value of the gas density relay is measured, the temperature change speed is not more than 1.0 ℃ per second when approaching the action value.
47. A gas density monitoring device with online self-checking function is characterized in that: the gas density monitoring device is composed of a gas density relay with an on-line self-checking function according to any one of claims 1 to 46; or the gas density monitoring device comprises the gas density relay with the on-line self-checking function as claimed in any one of claims 1 to 46.
48. A method of calibrating a gas density relay, comprising:
in a normal working state, the gas density relay monitors a gas density value in the electrical equipment;
The gas density relay is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition or/and the temperature value condition under the condition that the gas density relay is allowed to be checked:
The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay, and the contact of the gas density relay body is connected to the intelligent control unit;
The temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, and after the temperature reaches a set value, the valve is closed through the intelligent control unit;
After the temperature or pressure of the gas density relay body is reduced to be proper, the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, and then the temperature of the temperature compensating element of the gas density relay body is increased, so that the gas density relay body is subjected to contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay body is detected, and the verification work of the contact signal action value of the gas density relay is completed;
after all the contact signal checking works are completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the temperature regulating mechanism.
49. The verification method of the gas density relay is characterized in that the gas density relay further comprises a verification initial density setting mechanism, a gas path of the verification initial density setting mechanism is communicated with the gas path of the gas density relay body, and the verification initial density setting mechanism is further connected with the intelligent control unit; the verification method comprises the following steps:
in a normal working state, the gas density relay monitors a gas density value in the electrical equipment;
The gas density relay is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition or/and the temperature value condition under the condition that the gas density relay is allowed to be checked:
The intelligent control unit is used for controlling the verification initial density setting mechanism and the valve to provide an air source with proper verification initial density for the air density relay to be verified;
the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is increased, the gas density relay body is subjected to joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during joint action, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay is completed;
after all the contact signal checking works are completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the temperature regulating mechanism.
50. The method of calibrating a gas density relay according to claim 49, comprising:
in a normal working state, the gas density relay monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
The gas density relay is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition or/and the temperature value condition under the condition that the gas density relay is allowed to be checked:
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay body, and the contact of the gas density relay body is connected to the intelligent control unit;
The intelligent control unit is used for controlling the verification initial density setting mechanism and the valve to provide an air source with proper verification initial density for the air density relay to be verified;
the temperature of the gas density relay body is increased by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is increased, the gas density relay body is subjected to joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during joint action, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay is completed;
The temperature of the gas density relay body is reduced by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay body is reduced, the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value when the contact is reset, the contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay is completed;
After all the contact signal checking work is completed, the intelligent control unit opens the valve, the intelligent control unit turns off the temperature regulating mechanism, and the on-line checking contact signal sampling unit is adjusted to a working state, and the control loop of the contact signal of the gas density relay body is restored to a normal working state.
51. A method of calibrating a gas density relay according to claim 48, or 49, or 50, comprising:
The intelligent control unit can perform depth calculation processing, and the depth calculation processing is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay body to be checked according to the ambient temperature value during the check and the air pressure value of the air chamber of the electrical equipment and the air pressure-temperature characteristic; or alternatively
The depth calculation process is as follows: the intelligent control unit provides an air source with proper initial density for the gas density relay body to be checked according to the ambient temperature value during the check, the gas pressure value of the gas chamber of the electrical equipment and the temperature value to be checked of the gas density relay and the gas pressure-temperature characteristic.
52. A method of calibrating a gas density relay according to claim 49 or 50, comprising: the verification initial density setting mechanism is an air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, the air chamber is heated by the heating element and/or refrigerated by the refrigerating element, so that the temperature of air in the air chamber is changed, after a set value is reached, a valve is closed by an intelligent control unit, the density lifting of the air density relay is further completed, and an air source capable of setting or establishing the verification initial density is provided for the air density relay.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910830184.7A CN110441195B (en) | 2019-09-04 | 2019-09-04 | Gas density relay with online self-checking function and checking method thereof |
| PCT/CN2020/111247 WO2021043035A1 (en) | 2019-09-04 | 2020-08-26 | Method for modifying gas density relay, and gas density relay having online self-checking function and checking method therefor |
| EP20860654.1A EP4027152A4 (en) | 2019-09-04 | 2020-08-26 | Method for modifying gas density relay, and gas density relay having online self-checking function and checking method therefor |
| US17/640,787 US20220336172A1 (en) | 2019-09-04 | 2020-08-26 | Method for modifying gas density relay, and gas density relay having online self-checking function and checking method therefor |
| JP2022515059A JP2022547139A (en) | 2019-09-04 | 2020-08-26 | Modification method of gas density relay, gas density relay with online self-check function and method for checking the same |
| BR112022004053A BR112022004053A2 (en) | 2019-09-04 | 2020-08-26 | Modification method for gas density relays, a gas density relay with online self-calibration function and the respective calibration method. |
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| CN201910830184.7A CN110441195B (en) | 2019-09-04 | 2019-09-04 | Gas density relay with online self-checking function and checking method thereof |
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| CN110441195A CN110441195A (en) | 2019-11-12 |
| CN110441195B true CN110441195B (en) | 2024-05-14 |
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| US20220336172A1 (en) * | 2019-09-04 | 2022-10-20 | Shanghai Roye Electric Co., Ltd. | Method for modifying gas density relay, and gas density relay having online self-checking function and checking method therefor |
| CN111446118B (en) * | 2020-04-29 | 2024-05-28 | 上海乐研电气有限公司 | Gas density relay with simulation verification function and simulation verification method thereof |
| CN112816363A (en) * | 2021-02-22 | 2021-05-18 | 国网冀北电力有限公司廊坊供电公司 | Novel density meter for switchgear and calculation method of gas density |
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