CN111443283B - Online verification device and online verification method for gas density relay - Google Patents
Online verification device and online verification method for gas density relay Download PDFInfo
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- CN111443283B CN111443283B CN202010354529.9A CN202010354529A CN111443283B CN 111443283 B CN111443283 B CN 111443283B CN 202010354529 A CN202010354529 A CN 202010354529A CN 111443283 B CN111443283 B CN 111443283B
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Classifications
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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
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- 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
- H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows
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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
- H01H35/36—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by curled flexible tube, e.g. Bourdon tube
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Abstract
The application provides an online verification device and an online verification method for a gas density relay, wherein the online verification device comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way joint, a gas source generating unit, an online verification contact signal sampling unit and an intelligent control unit; the gas pressure is increased and decreased through the normally open valve, the normally closed valve and the gas source generating unit, so that the gas density relay generates a contact signal action, the contact signal action is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit detects the contact signal action value and/or the return value of the gas density relay according to the density value when the contact signal acts, checking work of the gas density relay can be completed without the need of an overhauling personnel to arrive at the site, the reliability of a power grid is improved, the efficiency is improved, and the cost is reduced. Meanwhile, the whole verification process does not need to use gas of electrical equipment for verification, but provides a gas source required by verification through the gas source generation unit, so that the device is environment-friendly, safe and economical.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an on-line verification device and an on-line verification method for a gas density relay applied to high-voltage and medium-voltage electrical equipment.
Background
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 SOF 2, 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 insulation 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 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. The prior art gas density monitoring system (gas density relay) is basically: 1) The remote SF6 gas density relay is used for realizing the acquisition of density, pressure and temperature, uploading and realizing the 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 (generally a computer terminal) to realize on-line 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, further the periodic checking work of the (mechanical) gas density relay is finished, and meanwhile, the gas checking without electric equipment in the whole checking process is realized, thereby being environment-friendly, safe and economical, and no maintenance personnel is required to go to the site.
Disclosure of Invention
The invention aims to provide an on-line verification device and an on-line verification method for a gas density relay, 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 application provides an on-line checking device for a gas density relay, comprising: the gas density detection device comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way joint, a gas source generation unit, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the multi-way joint;
the multi-way connector is provided with a first interface, a second interface, a third interface and a fourth interface which are communicated with each other, wherein the first interface is connected with the gas density relay;
One end of the normally open valve is provided with an interface communicated with electrical equipment, and the other end of the normally open valve is communicated with a second interface of the multi-way joint; the normally open valve is configured to close or open the gas path of the electrical equipment to complete the closing of the gas path of the electrical equipment;
the air passage of the air source generating unit is communicated with the third interface of the multi-way joint; the gas source generating unit is configured to provide a gas source when the gas density relay is checked on line;
One end of the normally closed valve is communicated with a fourth interface of the multi-way joint, and the other end of the normally closed valve is communicated with the atmosphere; the normally closed valve is configured to close or open a gas path of a gas density relay connected with the multi-way joint, so that the gas density relay generates joint signal action;
The on-line checking contact signal sampling unit is connected with the on-line checking gas density relay and is configured to sample the contact signal of the gas density relay;
The intelligent control unit is respectively connected with the normally open valve, the normally closed valve, the gas density detection sensor and the on-line check contact signal sampling unit and is configured to control the normally open valve to be closed or opened, control the normally closed valve to be closed or opened, control the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the contact signal action value and/or the contact signal return value of the gas density relay;
wherein the contact signal includes an alarm, and/or a latch.
Preferably, the normally open valve or the normally closed valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve made of intelligent memory materials and opened or closed by electric heating.
Preferably, the normally open valve communicates with the electrical device through an electrical device connection.
Preferably, a second pressure sensor is further arranged on one side, close to the electrical equipment, of the normally open valve, and the second pressure sensor is connected with the intelligent control unit and is configured to monitor the gas pressure value of the electrical equipment.
Preferably, the normally closed valve and/or normally open valve is sealed within a cavity or housing.
Preferably, the valve further comprises a flow controller which is communicated with the other end of the normally-closed valve; or the flow controller is arranged between the multi-way joint and the normally-closed valve; the flow controller is configured to control a flow magnitude of the gas.
Preferably, the air source generating unit comprises one of a compressor, an air pump, a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump.
Preferably, the air source normally-closed valve is further included, and the air source normally-closed valve is arranged between the multi-way joint and the air source generating unit.
Preferably, the filter element is arranged on a gas path connected with a normally open valve, a normally closed valve, a multi-way joint or a gas source generating unit.
Preferably, the water treatment agent is arranged on the multi-way joint or the air source generating unit; preferably, the moisture treatment agent includes one of an adsorbent and a desiccant.
Preferably, the intelligent gas density relay further comprises a gas leakage alarming contact which is connected in series or in parallel to the alarming contact of the gas density relay to be checked on line, and the gas leakage alarming contact is further connected with the intelligent control unit.
Specifically, in a set period of time, the normally open valve is closed under the control of the intelligent control unit, the intelligent control unit monitors the gas density value P 20 through the gas density detection sensor, the gas density value P 20 is found to be gradually smaller through calculation processing, and the intelligent control unit sends out a gas leakage alarm contact signal or/and information through the gas leakage alarm contact; or the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and the gas pressure value P is found to be gradually reduced through calculation processing, and the intelligent control unit sends out a gas leakage alarm joint signal or/and information through the gas leakage alarm joint.
Preferably, the device further comprises a pressure regulating mechanism which is communicated with the other end of the normally closed valve; the pressure adjustment mechanism is configured to adjust a pressure rise and fall of the gas.
More preferably, during verification, the pressure regulating mechanism is a closed air chamber, the closed air chamber is communicated with the normally closed valve, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is caused by heating the heating element and/or refrigerating the heating element, so that the pressure rise and fall of the gas density relay for performing line verification are finished; or alternatively
The pressure regulating mechanism is a cavity with one end open, the other end of the cavity is communicated with the normally closed valve, a 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 part, 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 part drives the adjusting rod to drive the piston to move in the cavity; or alternatively
The pressure regulating mechanism is a closed air chamber, the closed air chamber is communicated with the normally closed valve, a piston is arranged in the closed air chamber and 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 pressure regulating 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 normally closed valve; or alternatively
The pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the normally closed valve, and the other end of the corrugated pipe stretches under the drive of the driving part;
Wherein the driving part comprises one of magnetic force, a motor, a reciprocating mechanism, a Carnot circulation mechanism and a pneumatic element.
Preferably, the gas density detection sensor is provided on a multi-way joint; or the gas density detection sensor is arranged on the gas density relay which is checked on line.
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 on-line calibrated gas density relay.
More preferably, the temperature sensor is installed on or outside the gas path of the on-line verified gas density relay, or installed in or outside the on-line verified gas density relay.
More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor; can be contact type or non-contact type; and may be a thermal resistor and a thermocouple.
More preferably, at least one temperature sensor is arranged near or on or integrated in the temperature compensation element of the on-line verified gas density relay; preferably, at least one temperature sensor is provided at an end of the pressure detector of the on-line verified gas density relay 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 joint signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a normally open valve or an intelligent control unit; in a non-verification state, the on-line verification contact signal sampling unit is relatively isolated from a contact signal of the gas density relay on a circuit through an isolation sampling element; in the verification state, the on-line verification contact signal sampling unit cuts off a contact signal control loop of the gas density relay through the isolation sampling element, and connects the contact of the gas density relay with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
More preferably, the on-line checking contact signal sampling unit includes a first connection circuit and a second connection circuit, the first connection circuit connects the contact of the gas density relay with the contact signal control circuit, and the second connection circuit connects the contact of the gas density relay with the intelligent control unit; in a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit, and connects the contact of the gas density relay with the intelligent control unit.
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 on-line checking contact signal sampling unit samples the contact signal of the on-line checking gas density relay 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 test voltage of the on-line checking contact signal sampling unit to the contact signal action value or the switching value of the on-line checking gas density relay is not lower than 24V, namely, when checking, the voltage is applied between the corresponding terminals of the contact signal to be not lower than 24V.
Preferably, the gas density relay comprises a shell, a base, a pressure detector, a temperature compensation element and at least one signal generator, wherein the base, the pressure detector, the temperature compensation element and the at least one signal generator are arranged in the shell; the gas density relay 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 gas density detection sensor is provided on a multi-way joint; or the gas density detection sensor is provided on the gas density relay.
More preferably, the gas density relay and the gas density detection sensor are of an integrated structure; or the gas density relay and the gas density detection sensor are remote-transmission type gas density relay with integrated structures.
More preferably, the on-line check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.
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 to complete on-line monitoring of the gas density of the monitored electrical equipment.
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 to be checked online generates contact signal action or is switched, so as to complete the online checking of the gas density relay; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay to be checked online generates joint signal action or switching, and converts the pressure value and the temperature value into the pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, the gas density value, so as to finish the online checking of the gas density relay.
Preferably, the intelligent control unit acquires a gas density value P 20 acquired by the gas density detection sensor, and if the gas density value P 20 is more than or equal to a preset threshold value, the intelligent control unit controls and opens the normally closed valve, and simultaneously, the intelligent control unit sends out an abnormal signal and/or information of the excessive pressure; or the intelligent control unit acquires the gas pressure value P acquired by the gas density detection sensor, and if the pressure value P is more than or equal to a preset threshold value, the intelligent control unit controls and opens the normally closed valve, and simultaneously, the intelligent control unit sends out abnormal signals and/or information of the excessive pressure.
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.
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 on-line verification device of the gas density relay completes on-line verification of the on-line verified gas density relay according to the setting or the instruction of the background; or completing the on-line verification of the on-line verified gas density relay according to the set verification time of the gas density relay.
More preferably, the gas circuit of the normally closed valve is communicated with the gas density relay 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 and the normally closed valve of the on-line verification.
Preferably, the self-sealing valve is arranged between the electrical equipment and the normally open valve; or the normally open valve is installed between the electrical equipment and the self-sealing valve.
Preferably, the electric equipment further comprises a gas supplementing interface, wherein the gas supplementing interface is arranged on the electric equipment; or the air supplementing interface is arranged between the electrical equipment and the normally open valve; or the air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the normally open valve and the air path of the multi-way connector, or the second connecting pipe is communicated with the normally open valve and the on-line check gas density relay.
Preferably, the intelligent control unit further comprises a display interface for man-machine interaction, wherein the display interface is connected with the intelligent control unit, displays current verification data in real time, and/or supports data input.
Preferably, the intelligent control unit further comprises a contact resistance detection unit, wherein the contact 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 on-line checking gas density relay is isolated from the control loop, and the contact resistance detection unit can detect the contact resistance value of the on-line checking gas density relay when the contact signal of the on-line checking gas density relay acts and/or when receiving an instruction for detecting the contact resistance of the contact.
Preferably, 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 on-line checking gas density relay is isolated from the control loop, and the insulation resistance detection unit can detect the contact insulation resistance value of the on-line checking gas density relay when the contact signal of the on-line checking gas density relay acts and/or when an instruction for detecting the contact insulation resistance is received.
Preferably, the gas density relay to be checked on-line includes, but is not limited to, a bimetallic strip compensated gas density relay, a gas compensated gas density relay, a bimetallic 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 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 intelligent control system further comprises a micro-water sensor, wherein the micro-water sensor is respectively connected with the multi-way joint and the intelligent control unit.
More preferably, the intelligent control system further comprises a gas circulation mechanism, wherein the gas circulation mechanism is respectively connected with the on-line verified gas density relay and the intelligent control unit, and comprises a capillary tube, a sealed chamber 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 intelligent control device further comprises a decomposition product sensor, wherein the decomposition product sensor is respectively connected with the multi-way joint and the intelligent control unit.
Preferably, the gas density relay on-line verification device further comprises a camera for monitoring.
The second aspect of the application provides an online verification method of an online verification device of a gas density relay, comprising the following steps: when in a normal working state, a normally open valve of the on-line checking device is in an open state, a normally closed valve is in a closed state, and an on-line checked gas density relay monitors a gas density value in the electrical equipment;
The on-line checking device checks the condition of the gas density relay according to the set checking time or/and checking instructions and the condition of the gas density value, and under the condition of allowing the gas density relay to be checked:
Closing the normally open valve through the intelligent control unit;
The intelligent control unit is used for controlling the air source generating unit to enable the air source generating unit to start a working mode and provide an air source required by on-line verification, and when the air pressure of the air source reaches a preset threshold value, the intelligent control unit is used for controlling the air source generating unit to enable the air source generating unit to be in a stop working mode; then, the normally closed valve is opened through the intelligent control unit, so that the gas pressure is slowly reduced, the on-line verified gas density relay generates a contact signal action, the contact signal action is transmitted to the intelligent control unit through the on-line verified 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 signal acts, or directly obtains the gas density value, the contact signal action value of the on-line verified gas density relay 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 firstly closes the normally closed valve and then opens the normally open valve.
Preferably, an on-line verification method of an on-line verification device of a gas density relay comprises the following steps:
When in a normal working state, a normally open valve of the on-line checking device is in an open state, a normally closed valve of the on-line checking device is in a closed state, and the on-line checking device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit; monitoring a gas density value in the electrical equipment by the on-line verified gas density relay;
The on-line checking device checks the condition of the gas density relay according to the set checking time or/and checking instructions and the condition of the gas density value, and under the condition of allowing the gas density relay 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 contact signal control loop of the on-line checked gas density relay, and the contact of the on-line checked gas density relay is connected to the intelligent control unit;
Closing the normally open valve through the intelligent control unit;
The intelligent control unit opens the air source normally closed valve, and then controls the air source generating unit to enable the air source generating unit to open a working mode and provide an air source required by on-line verification, and when the air pressure of the air source reaches a preset threshold value, the intelligent control unit closes the air source normally closed valve, and then controls the air source generating unit to enable the air source generating unit to be in a stop working mode; then, the normally closed valve is opened through the intelligent control unit, so that the gas pressure is slowly reduced, the on-line verified gas density relay generates a contact signal action, the contact signal action is transmitted to the intelligent control unit through the on-line verified 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 signal acts, or directly obtains the gas density value, the contact signal action value of the on-line verified gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
The intelligent control unit firstly closes the normally closed valve and then opens the gas source normally closed valve, then controls the gas source generating unit to enable the gas source generating unit to start a working mode, enables gas pressure to slowly rise, enables the on-line verified gas density relay to generate contact signal reset, enables the contact signal reset to be transmitted to the intelligent control unit through the on-line verified contact signal sampling unit, enables the intelligent control unit to obtain a gas density value according to a pressure value and a temperature value when the contact signal is reset, or directly obtains the gas density value, detects a contact signal return value of the on-line verified gas density relay, and completes verification work of the contact signal return value of the on-line verified gas density relay;
After all the contact signal checking work is completed, the intelligent control unit is controlled to resume operation to a normal working state: the air source generating unit is in a stop working mode, the air source normally-closed valve and the normally-closed valve are both in a closed state, and the normally-open valve is in an open state; and meanwhile, the intelligent control unit also adjusts the on-line checking contact signal sampling unit to a working state, and the contact signal control loop of the on-line checked gas density relay resumes operation to the normal working state.
Preferably, the intelligent control unit acquires a gas density value P 20 acquired by the gas density detection sensor, if the gas density value P 20 is more than or equal to a preset threshold value, the intelligent control unit controls and opens the normally closed valve to reduce the gas pressure, and meanwhile, the intelligent control unit sends out an abnormal signal and/or information of the excessive pressure; or alternatively
The intelligent control unit acquires the gas pressure value P acquired by the gas density detection sensor, and if the pressure value P is more than or equal to a preset threshold value, the intelligent control unit controls and opens the normally closed valve to enable the gas pressure to drop, and meanwhile, the intelligent control unit sends out abnormal signals and/or information of the excessive pressure.
Preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor, or the gas density detection sensor adopts a gas density transmitter composed of the pressure sensor and the temperature sensor; the online verification method further comprises the following steps:
When the normally open valve is in a closed state, the on-line check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, the intelligent control unit controls and opens the normally closed valve, so that when the gas pressure slowly drops to a zero position, the intelligent control unit receives a pressure signal P 0 collected by the pressure sensor, and if the pressure difference |P 0 -0| is not less than or equal to a preset threshold value, the intelligent control unit sends out a signal and/or information of abnormal zero position deviation of the pressure sensor.
Preferably, the on-line verification device further comprises a gas leakage alarming contact, wherein the gas leakage alarming contact is connected in series or in parallel with the alarming contact of the on-line verification gas density relay, and the gas leakage alarming contact is further connected with the intelligent control unit; the online verification method further comprises the following steps:
In a set time period, the normally open valve is closed under the control of the intelligent control unit, the intelligent control unit monitors the gas density value P 20 through the gas density detection sensor, the gas density value P 20 is found to be gradually smaller through calculation processing, and the intelligent control unit sends out a gas leakage alarm contact signal or/and information through the gas leakage alarm contact; or the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and the gas pressure value P is found to be gradually reduced through calculation processing, and the intelligent control unit sends out a gas leakage alarm joint signal or/and information through the gas leakage alarm joint.
Preferably, the contact signal includes an alarm, and/or a latch.
Preferably, after the gas density relay checked on line completes the check, if there is an abnormality, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.
Preferably, the online 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 online 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 an on-line calibration device and an on-line calibration method for a gas density relay, which are used for high-voltage and medium-voltage electrical equipment. The gas pressure is lifted through the normally open valve, the normally closed valve and the gas source generating unit, so that the gas density relay generates a contact signal action, the contact signal 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 according to a density value when the contact signal acts, checking work of the gas density relay can be completed without a maintainer going to the site, maintenance-free performance is realized, reliability of a power grid is greatly improved, working efficiency is improved, and operation and maintenance cost is reduced. In the whole verification process, the air source generating unit is used for providing an air source required by verification, SF6 gas of electrical equipment is not needed for verification, the environment is protected, safety and economy are realized, and particularly, zero verification diagnosis of the pressure sensor can be realized, and when the pressure is monitored to be too high, serious problems caused by the too high pressure can be prevented by releasing the pressure.
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 an on-line gas density relay calibration apparatus according to the first embodiment;
FIG. 2 is a schematic circuit control diagram of an on-line verification device for a gas density relay according to the first embodiment;
FIG. 3 is a schematic diagram of an on-line gas density relay calibration apparatus according to a second embodiment;
FIG. 4 is a schematic diagram of the gas density relay on-line verification device of the third embodiment;
FIG. 5 is a schematic diagram of an on-line gas density relay calibration apparatus according to a fourth embodiment;
FIG. 6 is a schematic diagram of an on-line gas density relay calibration apparatus according to a fifth embodiment;
fig. 7 is a schematic diagram of the structure of an on-line verification device for a gas density relay according to the sixth embodiment.
Legend description:
1. A gas density relay to be checked on line; 2. a pressure sensor; 3. a temperature sensor; 4. a normally open valve; 41. a normally open valve seal housing; 42. normally open valve lead wire sealing piece; 5. an air source generating unit; 501. an air source sealing shell; 502. an air source outgoing line sealing piece; 6. the on-line checking contact signal sampling unit; 7. an intelligent control unit; 8. an electrical device; 9. a multi-way joint; 901. a multi-way joint first interface; 902. a multi-way joint second interface; 903. a third interface of the multi-way joint; 904. a fourth interface of the multi-way joint; 905. a fifth interface of the multi-way joint; 10. a normally closed valve of the air source; 101. the normally closed valve of the air source seals the shell; 102. an air source normally closed valve outgoing line sealing piece; 11. a normally closed valve; 1101. a normally closed valve seal housing; 1102. normally closed valve lead-out wire sealing piece; 12. a flow controller; 1201. a flow controller seal housing; 1202. a flow controller lead-out wire seal; 13. a pressure regulating mechanism; 1301. a pressure regulating mechanism housing; 1302. a cavity; 1303. a piston; 1304. a driving part; 1305. an adjusting rod; 1306. a seal; 1307. an air bag; 1308. a push rod; 14. a filter; 15. a moisture treatment agent; 16. and a second filter.
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, an on-line checking device for a gas density relay includes: the intelligent control device comprises a pressure sensor 2, a temperature sensor 3, a normally open valve 4, an air source generating unit 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a normally closed valve 11, a flow controller 12, a filter element 14 and a water treatment agent 15. The multi-way connector 9 is provided with a first interface 901, a second interface 902, a third interface 903, a fourth interface 904 and a fifth interface 905 which are mutually communicated. The pressure sensor 2 of the gas density detection sensor communicates with the fifth interface 905 of the multi-way joint 9. The gas path of the gas density relay 1 to be verified is communicated with the first interface 901 of the multi-way joint 9. One end of the normally open valve 4 is provided with an interface communicated with the electrical equipment 8, the other end of the normally open valve 4 is communicated with a second interface 902 of the multi-way joint 9, and the normally open valve 4 is configured to close or open an air passage of the electrical equipment 8 to close the air passage of the electrical equipment 8. The gas path of the gas source generating unit 5 is connected to the third port 903 of the multi-port connector 9 through a filter 14, and the gas source generating unit 5 is configured to provide a gas source when checking the gas density relay 1 on line. One end of the normally closed valve 11 is connected with one end of the flow controller 12, the other end of the flow controller 12 is communicated with the fourth interface 904 of the multi-way joint 9, the other end of the normally closed valve 11 is communicated with the atmosphere, and the normally closed valve 11 is configured to close or open a gas path of the gas density relay 1 to be checked, which is connected with the multi-way joint 9, so that the gas density relay 1 to be checked generates a contact signal action. The on-line checking contact signal sampling unit 6 is connected with the gas density relay 1 to be checked and the intelligent control unit 7 and is configured to sample the contact signal of the gas density relay 1 to be checked. The intelligent control unit 7 is respectively connected with the normally open valve 4, the normally closed valve 11, the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3), the flow controller 12 (which can control and regulate the flow on line or is set to not need to regulate the flow) and the on-line check joint signal sampling unit 6, and is configured to control the normally open valve 4 to be closed or opened, control the normally closed valve 11 to be closed or opened, and control 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 when the joint of the gas density relay 1 checked by the line is acted. In this case, the air source generating unit 5 is one of an air compressor (compressor), an air pump, a pressure-generating pump, a booster pump, an electric air pump, and an electromagnetic air pump. In the above embodiments, the normally open valve 4 and the normally closed valve 11 may be various, and a shut-off valve such as a ball valve, a butterfly valve, a gate valve, a shut-off valve, a plug valve, a butterfly valve, a needle valve, a diaphragm valve, or the like may be used. If the valve is a ball valve, the valve core can be driven to close the air passage of the switch equipment by rotating the self-sealing valve core, and the valve can be flexibly designed according to actual needs. The normally open valve 4 and the normally closed valve 11 are automatic, or can be manually or semi-manually checked. For better sealing, the air source generating unit 5 is sealed in the air source sealing shell 501 and is connected with the intelligent control unit 7 through the air source lead-out wire sealing piece 502; the flow controller 12 is sealed inside the flow controller sealing housing 1201 and connected to the intelligent control unit 7 through the flow controller outlet seal 1202. A moisture treatment agent 15 is also provided on the multi-way joint 9.
The checksum monitoring working principle of the gas density relay on-line checking device of the embodiment is as follows:
As shown in fig. 1 and fig. 2, in a normal working state, the normally open valve 4 of the on-line checking device is in an open state, the normally closed valve 11 is in a closed state, the gas source generating unit 5 is in a non-working mode, the on-line checked gas density relay 1 monitors the gas density value in the electrical equipment 8, and meanwhile, the on-line checking device monitors the gas density value in the electrical equipment 8 on line through the gas density detecting sensor and the intelligent control unit 7. The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment 8 according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P 20 (namely a gas density value).
When the gas density relay 1 needs to be checked, if the gas density value P 20 is larger than or equal to the set safety check density value P S, the online checking device or the background sends out an instruction, the online check contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online check contact signal sampling unit 6 cuts off a contact signal control loop of the gas density relay 1 to connect a contact of the gas density relay 1 to the intelligent control unit 7. Referring to fig. 2, the normally open valve 4 is closed by the intelligent control unit 7, and then the air source generating unit 5 is controlled by the intelligent control unit 7, so that the air source generating unit 5 is opened in a working mode, and the air source required by on-line verification is provided. When the gas pressure of the gas source reaches a preset threshold value, the intelligent control unit 7 controls the gas source generating unit 5 to enable the gas source generating unit 5 to be in a stop working mode. Then, the normally closed valve 11 is opened through the intelligent control unit 7, the flow controller 12 is controlled to enable the gas pressure to slowly decrease, so that the on-line verified gas density relay 1 generates a contact signal action, the contact signal action is transmitted to the intelligent control unit 7 through the on-line verified contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value and the temperature value measured during the contact signal action into a pressure value P 20 corresponding to 20 ℃ according to the gas characteristic, namely, the gas density value, or directly obtains the gas density value, the contact signal action value P D20 of the on-line verified gas density relay 1 is detected, and the verification of the contact signal action value of the gas density relay 1 is completed.
After all the contact action values of the alarm and/or locking signals of the gas density relay 1 are detected, the normally closed valve 11 is closed through the intelligent control unit 7, then the gas source generating unit 5 is controlled by the intelligent control unit 7, so that the gas source generating unit 5 is in an open working mode, the gas pressure is slowly increased, the contact signal reset of the gas density relay 1 checked on line is caused, the contact signal reset is transmitted to the intelligent control unit 7 through the contact signal sampling unit 6 for on-line checking, the intelligent control unit 7 obtains the gas density value according to the pressure value and the temperature value when the contact signal is reset, or directly obtains the gas density value, and the alarm and/or locking contact signal return value of the gas density relay 1 checked on line is detected, so that the checking work of the contact signal return value of the gas density relay 1 checked on line is completed. 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 1.
Then, the operation is resumed to the normal operation state by the control of the intelligent control unit 7: the air source generating unit 5 is in a stop working mode; the normally closed valve 11 is in a closed state; opening the normally open valve 4 through the intelligent control unit 7 so that the gas density relay 1 is communicated with the electrical equipment 8 on the gas path; meanwhile, the intelligent control unit 7 adjusts the on-line checking contact signal sampling unit 6 to a working state, the contact signal control loop of the on-line checked gas density relay 1 is restored to a normal working state, the density monitoring loop of the gas density relay 1 works normally, the gas density relay 1 monitors the gas density of the electrical equipment 8 safely, and the gas equipment 8 works safely and reliably. Thus, the on-line checking work of the gas density relay 1 is conveniently completed, and the safety operation of the electrical equipment is not affected when the gas density relay 1 is checked on line.
Because the gas density relay 1 has been monitored and judged for the safety check density value P S set at a value of the gas density value P 20. Gtoreq.before starting the check, the gas of the electrical equipment 8 is in the safety operation range, moreover, the gas leakage is a slow process, and the check is safe.
As shown in fig. 2, the on-line verification device further includes a leak alarm contact 17. The normally open valve 4 is closed under the control of the intelligent control unit 7 within a set period of time, for example, 2 hours, the intelligent control unit 7 monitors the gas density value P 20 through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3), the gas density value is found to be gradually smaller through calculation processing, the intelligent control unit 7 sends out a gas leakage alarm contact signal or/and information, and the intelligent control unit 7 uploads the gas leakage alarm contact signal or/and information to the background. The gas leakage alarm contact 17 is connected in parallel with an alarm contact (normally open type gas density relay when the density is normal) of the gas density relay 1 in on-line verification; or the gas leakage alarm contact 17 is connected in series with an alarm contact (normally closed type gas density relay when the density is normal) of the gas density relay 1 in on-line verification. For example, the gas leakage alarm contact 17 is connected in parallel to an alarm contact PJ of the gas density relay for online verification (for normal density, the contact is a normally open gas density relay), 8 o' clock in the morning is a day, the gas density relay online verification device closes the normally open valve 4 under the control of the intelligent control unit 7, and then the gas density value P 20 monitored by the intelligent control unit 7 through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) is 0.622MPa. After an hour, that is, 9 o' clock in the morning, the intelligent control unit 7 detects that the gas density value P 20 detected by the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) is 0.612MPa, the intelligent control unit 7 finds that the gas density value is reduced by 0.01MPa in one hour through calculation processing, the change of the gas density value exceeds a preset threshold value, the intelligent control unit 7 drives the gas leakage alarm joint 17 to be closed (the case is closed or opened), and then a gas leakage alarm joint signal or/and information is sent out, and meanwhile, the gas leakage information of the gas density relay on-line verification device is remotely transmitted to the background through the intelligent control unit 7, and then the normally open valve 4 is opened under the control of the intelligent control unit 7. Therefore, the gas density relay on-line checking device has a gas leakage self-diagnosis function, and can find out gas leakage problems in time, so that the gas density relay on-line checking device is more suitable for field application, and a power grid is more reliable and safer. In addition, the intelligent control unit 7 may detect the gas pressure value P detected by the gas density detection sensor, and the gas pressure value is found to be gradually smaller through calculation, and the intelligent control unit 7 sends out a gas leakage alarm contact signal or/and information.
When the gas density relay is checked (or the zero position of the pressure sensor is checked), the intelligent control unit 7 confirms that the normally open valve 4 is in a closed state, at this time (or through the intelligent control unit 7), the on-line check joint signal sampling unit 6 is adjusted to a checking state, namely, in the checking state, the intelligent control unit 7 controls and opens the normally closed valve 11, so that the gas pressure of the gas path connected by the multi-way joint slowly drops to the zero position, at this time, the intelligent control unit 7 receives a pressure signal P 0 collected by the pressure sensor 2, and if the pressure difference |P 0 -0| is more than or equal to a preset threshold value, the intelligent control unit 7 sends out a signal and/or information of abnormal zero position deviation of the pressure sensor.
The intelligent control unit 7 acquires a gas density value P 20 acquired by the gas density detection sensor, if the density value P 20 is more than or equal to a preset threshold value, the intelligent control unit 7 controls and opens the normally closed valve 11 to reduce the gas pressure, so that serious accidents such as explosion and the like possibly caused by overhigh pressure of the electrical equipment 8 are prevented, and the intelligent control unit 7 sends out abnormal signals and/or information of overhigh pressure; for example, the intelligent control unit 7 can transmit the abnormal signal with the excessive pressure to the background through the alarm signal loop of the density relay, so that operation and maintenance personnel can know the abnormal signal and can timely handle the problem, and the problem is prevented from being enlarged. Or the intelligent control unit 7 obtains the gas pressure value P acquired by the gas density detection sensor, if the pressure value P is more than or equal to a preset threshold value, the intelligent control unit 7 controls and opens the normally closed valve 11 to reduce the gas pressure, so that serious accidents such as explosion and the like of the electrical equipment 8 are prevented, the intelligent control unit 7 sends out abnormal signals and/or information of the excessive pressure, so that operation and maintenance personnel can timely find and process the accidents, and safe and reliable operation of the power grid is ensured.
In this embodiment, the multi-way joint 9 is further provided with a moisture treatment agent 15, and the moisture treatment agent 15 is disposed in the cavity of the multi-way joint 9, and preferably, the moisture treatment agent 15 is selected from one of an adsorbent and a desiccant. For example, an alumina molecular sieve (also called an activated alumina desiccant) can be used to make the moisture of the on-line calibration device very tiny, so that the moisture of the electrical equipment 8 is ensured not to be increased or exceed the standard in the on-line calibration process, and the moisture of the electrical equipment can be reduced. The design principle of the moisture treating agent 15 is that the moisture treating agent is convenient for site replacement, a cavity (a proper large hole) can be arranged on the multi-way joint 9, then the moisture treating agent 15 is fixed on a closed joint, and the moisture treating agent 15 is fixed in the cavity of the multi-way joint 9 through the closed joint, so that timely replacement in a certain period can be realized. In this embodiment, the air path of the air source generating unit 5 is communicated with the third port 903 of the multi-way connector 9 through a filter element 14, and the filter element 14 may be one of a filter screen, a filter core, and a filter. The filter screen is adopted in the case, so that the gas of the electrical equipment 8 is prevented from being polluted in the online verification process, and the safe and reliable operation of the electrical equipment 8 is ensured.
The types of pressure sensors 2 described above include absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, the number of which may be several. 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 a thermocouple, a thermistor, or a semiconductor; can be contact type or non-contact type; 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 above-mentioned on-line checking contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay 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 the verification, namely, the safety operation of the electrical equipment is not affected when the contact signal of the gas density relay 1 acts during the verification; 2) The contact signal control loop of the gas density relay 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 above-mentioned intelligent control unit 7 are: the control and signal acquisition of the normally open valve 4, the normally closed valve 11, the air source generating unit 5 and the flow controller 12 are completed through 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 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 1 can be detected, and the verification work of the gas density relay 1 is completed. Or the density value P D20 when the contact signal of the gas density relay 1 acts can be directly detected, and the verification work of the gas density relay 1 is completed. Meanwhile, the self-checking work among the gas density relay 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 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 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the rated pressure value verification of the gas density relay 1 is completed.
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 detection sensor, the normally open valve 4, the normally closed valve 11, the gas source generation unit 5, the flow controller 12, the on-line check contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly arranged according to the needs. For example, the pressure sensor 2 and the temperature sensor 3 may be provided together; the pressure sensor 2, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent control unit 7 may be provided together. In short, the arrangement between them can be flexibly arranged and combined.
When the gas density relay 1 completes the verification work, the on-line verification device judges and can inform the detection result. The mode is flexible, and specifically can: 1) The on-line verification device can be announced on site, for example, by an indicator light, a digital code, a liquid crystal or the like; 2) Or the online verification device can upload the data in an online remote communication mode, for example, the data 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 online checking 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 on-line checking device finishes the checking 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 alarm contact signals of the gas density relay 1, and can also display notices 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 on-line checking device has a safety protection function, and particularly when the on-line checking device is lower than a set value, the on-line checking device automatically does not perform on-line checking on the density relay any more and sends out a notification signal. For example, when the gas density value of the electric device is smaller than the set value P S, the on-line verification is not performed, and only when the gas density value of the electric device is equal to or larger than (the alarm pressure value+0.02mpa), the on-line verification can be performed.
The on-line checking device can check repeatedly for a plurality of times (for example, 2-3 times), and calculate the average value according to the checking result of each time. If necessary, the gas density relay can be checked on line at any time.
Meanwhile, the on-line checking device 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, the pressure value and/or the temperature value to the target equipment to realize on-line monitoring.
Embodiment two:
As shown in fig. 3, an on-line checking device for a gas density relay includes: the device comprises a pressure sensor 2, a temperature sensor 3, a normally open valve 4, an air source generating unit 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air source normally closed valve 10, a normally closed valve 11, a flow controller 12, a filter element 14 and a moisture treating agent 15. The difference between this embodiment and the first embodiment is that: an air source normally-closed valve 10 and a filter element 14 are added between the air source generating unit 5 and the multi-way joint 9, the air source normally-closed valve 10 is sealed in an air source normally-closed valve sealing shell 101 and is connected with the intelligent control unit 7 through an air source normally-closed valve lead-out wire sealing element 102; the normally open valve 4 is sealed in a normally open valve sealing shell 41 and is connected with the intelligent control unit 7 through a normally open valve lead-out wire sealing piece 42; the normally closed valve 11 is sealed in a normally closed valve sealing housing 1101, and is connected to the intelligent control unit 7 through a normally closed valve lead wire sealing member 1102.
The checksum monitoring working principle of this embodiment is as follows: in the first embodiment, in the normal working state, the normally open valve 4 of the on-line checking device is in an open state, the normally closed valve 11 is in a closed state, and the on-line checking device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) and the intelligent control unit 7; the gas density relay 1, which is checked on-line, monitors the gas density value within the electrical device 8. The on-line checking device checks the condition of the gas density relay according to the set checking time or/and checking instructions and the condition of the gas density value, and under the condition of allowing the gas density relay to be checked: 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 contact signal control loop of the on-line checked gas density relay 1, and the contact of the on-line checked gas density relay 1 is connected to the intelligent control unit; closing the normally open valve 4 by the intelligent control unit 7; the gas source normally-closed valve 10 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the gas source generating unit 5 again, so that the gas source generating unit 5 is opened in a working mode, a gas source required by on-line verification is provided, when the gas pressure of the gas source reaches a preset threshold value, the intelligent control unit 7 closes the gas source normally-closed valve 10, and the intelligent control unit 7 controls the gas source generating unit 5 again, so that the gas source generating unit 5 is in a working stop mode; then, the normally closed valve 11 is opened through the intelligent control unit 7, and the gas pressure is slowly reduced due to the action of the flow controller 12 (which can also be arranged at the left side of the normally closed valve 11), so that the on-line verified gas density relay 1 generates a contact signal action, the contact signal action is transmitted to the intelligent control unit 7 through the on-line verified 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 signal acts, or directly obtains the gas density value, the contact signal action value of the on-line verified gas density relay 1 is detected, and the verification work of the contact signal action value of the gas density relay 1 is completed. Then, the normally closed valve 11 is closed through the intelligent control unit 7, the gas source normally closed valve 10 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the gas source generating unit 5 again, the gas source generating unit 5 is in an opening working mode, the gas pressure is slowly increased, the on-line verified gas density relay 1 is enabled to generate contact signal reset, the contact signal reset is transmitted to the intelligent control unit 7 through the on-line verified 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 signal is reset, or directly obtains the gas density value, the contact signal return value of the on-line verified gas density relay 1 is detected, and verification of the contact signal return value of the on-line verified gas density relay 1 is completed. After all the contact signal checking work is completed, the intelligent control unit 7 is controlled to resume operation to a normal working state: the air source generating unit 5 is in a stop working mode, the air source normally-closed valve 10 and the normally-closed valve 11 are both in a closed state, and the normally-open valve 4 is in an open state; meanwhile, the intelligent control unit 7 also adjusts the on-line checking contact signal sampling unit 6 to a working state, and the contact signal control loop of the on-line checked gas density relay 1 resumes operation to the normal working state.
Embodiment III:
As shown in fig. 4, an on-line checking device for a gas density relay includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the normally open valve 4, the gas source generating unit 5, the on-line checking joint signal sampling unit 6, the intelligent control unit 7, the multi-way joint 9, the gas source normally closed valve 10, the normally closed valve 11, the flow controller 12, the filter 14, the moisture treating agent 15 and the second filter 16. The difference between the first embodiment and the second embodiment is that: the on-line verification device in this embodiment further includes a gas density relay 1, and a pressure sensor 2, a temperature sensor 3, an on-line verification contact signal sampling unit 6, and an intelligent control unit 7 are all disposed on the gas density relay 1. The embodiment is also provided with a second filter element 16, and the second filter element 16 is arranged on the gas path between the multi-way joint 9 and the normally closed valve 11, so that the cleanness of the gas is ensured.
The gas density relay 1 comprises a shell, and a base, an end seat, a pressure detector, a temperature compensation element, a plurality of signal generators, a machine core, a pointer and a dial which are arranged in the shell. One end of the pressure detector is fixed on the base and is communicated with the base, the other end of the pressure detector is connected with one end of the temperature compensation element through the end seat, the other end of the temperature compensation element is provided with a cross beam, and the cross beam is provided with an adjusting piece for pushing the signal generator to enable a contact of the signal generator to be connected or disconnected. The movement is fixed on the base; 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 arranged in front of the dial, and the pointer is combined with the dial to display the gas density value. The gas density relay 1 may also comprise a digital device or a liquid crystal device with an indication display. The gas density relay 1 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. 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. Since this part belongs to the prior art, it will not be described in detail. The working principle is the same as that of the second embodiment, and will not be described in detail here.
Embodiment four:
as shown in fig. 5, an on-line checking device for a gas density relay includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the normally open valve 4, the gas source generating unit 5, the on-line check contact signal sampling unit 6, the intelligent control unit 7, the multi-way joint 9, the normally closed valve 11 and the flow controller 12. Compared with the embodiment, the embodiment is the same as the embodiment in that the on-line checking device of the embodiment also comprises a gas density relay 1; in contrast, the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the on-line check contact signal sampling unit 6 and the intelligent control unit 7 are independently arranged together. The working principle of the present invention can refer to the third embodiment, and is not described herein.
Fifth embodiment:
As shown in fig. 6, an on-line checking device for a gas density relay includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a normally open valve 4, an air source generating unit 5, an on-line checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air source normally closed valve 10, a normally closed valve 11 and a pressure regulating mechanism 13. The greatest difference between this embodiment compared with the first embodiment and the second embodiment is that: the on-line checking device according to the embodiment further comprises a pressure adjusting mechanism 13, and the pressure adjusting mechanism 13 is connected with the multi-way joint 9 through a normally closed valve 11. The pressure regulating mechanism 13 mainly includes a pressure regulating mechanism housing 1301, a chamber 1302, a piston 1303, a driving member 1304, an adjusting lever 1305, and a seal 1306. Specifically, the pressure regulating mechanism 13 is a cavity 1302 with one end open, and the other end of the cavity 1302 is communicated with the normally closed valve 11; the piston 1303 is arranged in the cavity 1302, one end of the piston 1303 is connected with an adjusting rod 1305, the outer end of the adjusting rod 1305 is connected with a driving component 1304, the other end of the piston 1303 extends into the opening and is in sealing contact with the inner wall of the cavity 1302 through a sealing piece 1306, and the driving component 1304 drives the adjusting rod 1305 to drive the piston 1303 to move in the cavity 1302, so that the volume of the cavity 1302 is changed, and the pressure is adjusted to rise and fall.
The checksum monitoring working principle of this embodiment is as follows: in the first embodiment, in the normal working state, the normally open valve 4 of the on-line checking device is in an open state, the normally closed valve 11 is in a closed state, and the on-line checking device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) and the intelligent control unit 7; the gas density relay 1, which is checked on-line, monitors the gas density value within the electrical device 8. The on-line checking device checks the condition of the gas density relay according to the set checking time or/and checking instructions and the condition of the gas density value, and under the condition of allowing the gas density relay to be checked: 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 contact signal control loop of the on-line checked gas density relay 1, and the contact of the on-line checked gas density relay 1 is connected to the intelligent control unit 7; closing the normally open valve 4 by the intelligent control unit 7; the gas source normally-closed valve 10 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the gas source generating unit 5 again, so that the gas source generating unit 5 is opened in a working mode, a gas source required by on-line verification is provided, when the gas pressure of the gas source reaches a preset threshold value, the intelligent control unit 7 closes the gas source normally-closed valve 10, and the intelligent control unit 7 controls the gas source generating unit 5 again, so that the gas source generating unit 5 is in a working stop mode; then, the normally closed valve 11 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the pressure regulating mechanism 13, the driving part 1304 drives the regulating rod 1305 to further drive the piston 1303 to move in the cavity 1302, the volume of the cavity 1302 is changed, the gas pressure is slowly reduced, the on-line verified gas density relay 1 generates a contact signal action, the contact signal action is transmitted to the intelligent control unit 7 through the on-line verified 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 signal acts, or directly obtains the gas density value, and the on-line verified contact signal action value of the gas density relay 1 is detected, so that the verification work of the contact signal action value of the gas density relay 1 is completed. Then, the intelligent control unit 7 controls the pressure adjusting mechanism 13 again, the driving part 1304 drives the adjusting rod 1305 to further drive the piston 1303 to move in the cavity 1302, so that the volume of the cavity 1302 is changed, the gas pressure is slowly increased, the on-line checked gas density relay 1 generates contact signal reset, the contact signal reset is transmitted to the intelligent control unit 7 through the on-line check 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 signal is reset, or directly obtains the gas density value, the contact signal return value of the on-line checked gas density relay 1 is detected, and the check work of the contact signal return value of the on-line checked gas density relay 1 is completed. After all the contact signal checking work is completed, the intelligent control unit 7 is controlled to resume operation to a normal working state: the air source generating unit 5 and the pressure regulating mechanism 13 are in a stop working mode, the air source normally-closed valve 10 and the normally-closed valve 11 are in a closed state, and the normally-open valve 4 is in an open state; meanwhile, the intelligent control unit 7 also adjusts the on-line checking contact signal sampling unit 6 to a working state, and the contact signal control loop of the on-line checked gas density relay 1 resumes operation to the normal working state.
Example six:
As shown in fig. 7, an on-line checking device for a gas density relay includes: the intelligent control system comprises a pressure sensor 2, a temperature sensor 3, a normally open valve 4, an air source generating unit 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, a normally closed valve 11 and a pressure regulating mechanism 13. The greatest difference between this embodiment and the fifth embodiment is that: the pressure adjusting mechanism 13 of the on-line checking device according to the present embodiment mainly includes a pressure adjusting mechanism housing 1301, a driving part 1304, an air bag 1307, and a push rod 1308. Specifically, the pressure regulating mechanism is an air bag 1307 with one end connected with a driving component, the air bag 1307 is subjected to volume change under the driving of the driving component 1304 and the push rod 1308, and the air bag 1307 is communicated with the multi-way joint 9 and the gas density relay 1. The working principle of the present invention can refer to the fifth embodiment, and is not described herein.
In a preferred embodiment, the on-line calibration device may have a plurality of pressure sensors and temperature sensors, where the pressure values monitored by the plurality of pressure sensors may be compared and mutually calibrated, and the temperature values monitored by the plurality of temperature sensors may be compared and mutually calibrated, and the density values of the corresponding plurality of gases monitored by the plurality of pressure sensors and the plurality of temperature sensors may be compared and mutually calibrated.
In another preferred embodiment, the on-line verification device may also comprise a gas density relay 1.
In summary, the on-line checking device for the gas density relay provided by the application has the main functions of performing on-line checking measurement on the contact point signal (the pressure value during alarm/locking action) of the gas density relay at the ambient temperature, automatically converting the contact point signal into the corresponding pressure value at 20 ℃, and realizing on-line performance detection on the contact point (alarm and locking) value of the gas density relay. The mounting positions of the gas density relay, the pressure sensor, the temperature sensor, the normally open valve, the normally closed valve, the on-line check contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay, the pressure sensor, the temperature sensor, the on-line checking joint signal sampling unit and the intelligent control unit can be combined together for integrated design or split design; can be arranged on the shell or the multi-way joint, and can also be connected together through a connecting pipe. The normally open valve can be directly connected with the electrical equipment, or can be connected with the electrical equipment through a self-sealing valve or an air pipe. 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 the integrated design is realized; 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 multi-way joint is provided with a first interface, a second interface, a third interface and a fourth interface which are mutually communicated, and two or more of the interfaces can be combined to simplify and flexibly design.
The online checking device can perform online checking according to set time, and also can perform online checking according to set temperature (such as limit high temperature, limit low temperature, 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 on-line checking device can compare the error performance of the density relay in different time periods according to different temperatures of 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. Physical examination of the density relay is also possible. 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 with the gas density relay. The density value, the gas density relay, 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 and the like are judged, compared and analyzed; the state of the contact signal of the gas density relay can be monitored, and remote transmission is carried out on the state. 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 can be detected or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the insulation performance of the gas density relay can also be 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 application has compact and reasonable structural arrangement, good rust prevention and vibration prevention capability of each part, firm installation, reliable use, easy operation of connection and disassembly of each pipeline, and convenient maintenance of equipment and parts. 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. Meanwhile, in the whole verification process, an air source generating unit is used for providing an air source required by verification, and SF6 gas of electrical equipment is not required to be used for verification, so that the method is environment-friendly, safe and economical. The product of the technical scheme can also be applied to on-site frequent checking of the gas density relay, diagnosis of the gas density performance, and particularly zero check diagnosis of the pressure sensor can be realized, and when the monitoring pressure is too high, the pressure can be released, so that serious problems caused by the too high pressure are prevented.
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 (20)
1. An on-line verification device for a gas density relay, comprising: the system comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way joint, a gas source generation unit, an on-line check contact signal sampling unit, an intelligent control unit and a pressure regulating mechanism;
The gas density detection sensor is communicated with the multi-way joint, wherein the gas density detection sensor is arranged on the multi-way joint or on an on-line check gas density relay;
the multi-way connector is provided with a first interface, a second interface, a third interface and a fourth interface which are communicated with each other, wherein the first interface is connected with the gas density relay;
One end of the normally open valve is provided with an interface communicated with electrical equipment, and the other end of the normally open valve is communicated with a second interface of the multi-way joint;
the air passage of the air source generating unit is communicated with the third interface of the multi-way joint; the gas source generating unit is configured to provide a gas source when the contact signal value of the gas density relay is checked on line;
One end of the normally closed valve is communicated with a fourth interface of the multi-way joint; the normally closed valve is configured to close or open a gas path of a gas density relay connected with the multi-way joint, so that the gas density relay generates joint signal action;
The on-line checking contact signal sampling unit is connected with the on-line checking gas density relay and is configured to sample the contact signal of the gas density relay;
The intelligent control unit is respectively connected with the normally open valve, the normally closed valve, the gas density detection sensor and the on-line check contact signal sampling unit and is configured to control the normally open valve to be closed or opened, control the normally closed valve to be closed or opened, control the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the contact signal action value and/or the contact signal return value of the gas density relay;
Wherein the contact signal includes an alarm, and/or a latch;
The pressure regulating mechanism is communicated with the other end of the normally closed valve; the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas, wherein the gas density relay can be enabled to generate a contact signal action and generate a contact signal reset by regulating the pressure regulating mechanism after the normally closed valve is opened.
2. The gas density relay on-line verification device of claim 1, wherein: the normally closed valve and/or the normally open valve is sealed within a cavity or housing.
3. The gas density relay on-line verification device of claim 1, wherein: the flow controller is communicated with the other end of the normally closed valve; or the flow controller is arranged between the multi-way joint and the normally-closed valve; the flow controller is configured to control a flow magnitude of the gas.
4. The gas density relay on-line verification device of claim 1, wherein: the air source generating unit comprises one of a compressor, an air pump, a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump.
5. The gas density relay on-line verification device of claim 1, wherein: the air source normal-closed valve is arranged between the multi-way joint and the air source generating unit.
6. The gas density relay on-line verification device of claim 1, wherein: the filter element is arranged on an air path connected with the normally open valve, the normally closed valve, the multi-way joint or the air source generating unit.
7. The gas density relay on-line verification device of claim 1, wherein: the water treatment agent is arranged on the multi-way joint or the air source generating unit; the moisture treating agent comprises one of an adsorbent and a drying agent.
8. The gas density relay on-line verification device of claim 1, wherein: the intelligent gas density relay further comprises a gas leakage alarming contact which is connected in series or in parallel to the alarming contact of the gas density relay to be checked on line, and the gas leakage alarming contact is further connected with the intelligent control unit.
9. The gas density relay on-line verification device of claim 1, wherein: when checking, the pressure regulating mechanism is a closed air chamber which is communicated with the normally closed valve, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the air in the closed air chamber is changed due to the heating element heating and/or the refrigerating element refrigerating, so that the pressure rise and fall of the air density relay for checking the line are completed; or alternatively
The pressure regulating mechanism is a cavity with one end open, the other end of the cavity is communicated with the normally closed valve, a 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 part, 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 part drives the adjusting rod to drive the piston to move in the cavity; or alternatively
The pressure regulating mechanism is a closed air chamber, the closed air chamber is communicated with the normally closed valve, a piston is arranged in the closed air chamber and 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 pressure regulating 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 normally closed valve; or alternatively
The pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the normally closed valve, and the other end of the corrugated pipe stretches under the drive of the driving part;
Wherein the driving part comprises one of magnetic force, a motor, a reciprocating mechanism, a Carnot circulation mechanism and a pneumatic element.
10. The gas density relay on-line verification device of claim 1, wherein: the gas density detection sensor comprises 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.
11. The gas density relay on-line verification device of claim 1, wherein: the on-line checking joint signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a normally open valve or an intelligent control unit; in a non-verification state, the on-line verification contact signal sampling unit is relatively isolated from a contact signal of the gas density relay on a circuit through an isolation sampling element; in the verification state, the on-line verification contact signal sampling unit cuts off a contact signal control loop of the gas density relay through the isolation sampling element, and connects the contact of the gas density relay with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
12. The gas density relay on-line verification device of claim 1, wherein: the gas density relay comprises a shell, a base, a pressure detector, a temperature compensation element and at least one signal generator, wherein the base, the pressure detector, the temperature compensation element and the at least one signal generator are arranged in the shell; the gas density relay 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.
13. The gas density relay on-line verification device of claim 12, wherein: the gas density detection sensor is arranged on the multi-way joint; or the gas density detection sensor is provided on the gas density relay.
14. The gas density relay on-line verification device of claim 12, wherein: the on-line checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.
15. The gas density relay on-line verification device of claim 1, wherein: the intelligent control unit also 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.
16. The on-line verification method of an on-line verification device for a gas density relay according to claim 1, comprising:
when in a normal working state, a normally open valve of the on-line checking device is in an open state, a normally closed valve is in a closed state, and an on-line checked gas density relay monitors a gas density value in the electrical equipment;
The on-line checking device checks the condition of the gas density relay according to the set checking time and/or checking instruction and the condition of the gas density value, and under the condition of allowing the checking of the gas density relay:
Closing the normally open valve through the intelligent control unit;
The intelligent control unit is used for controlling the air source generating unit to enable the air source generating unit to start a working mode and provide an air source required by on-line verification, and when the air pressure of the air source reaches a preset threshold value, the intelligent control unit is used for controlling the air source generating unit to enable the air source generating unit to be in a stop working mode; then, the normally closed valve is opened through the intelligent control unit, so that the gas pressure is slowly reduced, the on-line verified gas density relay generates a contact signal action, the contact signal action is transmitted to the intelligent control unit through the on-line verified 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 signal acts, or directly obtains the gas density value, the contact signal action value of the on-line verified gas density relay 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 firstly closes the normally closed valve and then opens the normally open valve.
17. The on-line verification method of a gas density relay on-line verification device according to claim 16, comprising:
When in a normal working state, a normally open valve of the on-line checking device is in an open state, a normally closed valve of the on-line checking device is in a closed state, and the on-line checking device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit; monitoring a gas density value in the electrical equipment by the on-line verified gas density relay;
The on-line checking device checks the condition of the gas density relay according to the set checking time and/or checking instruction and the condition of the gas density value, and under the condition of allowing the checking of the gas density relay:
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 contact signal control loop of the on-line checked gas density relay, and the contact of the on-line checked gas density relay is connected to the intelligent control unit;
Closing the normally open valve through the intelligent control unit;
The intelligent control unit opens the air source normally closed valve, and then controls the air source generating unit to enable the air source generating unit to open a working mode and provide an air source required by on-line verification, and when the air pressure of the air source reaches a preset threshold value, the intelligent control unit closes the air source normally closed valve, and then controls the air source generating unit to enable the air source generating unit to be in a stop working mode; then, the normally closed valve is opened through the intelligent control unit, so that the gas pressure is slowly reduced, the on-line verified gas density relay generates a contact signal action, the contact signal action is transmitted to the intelligent control unit through the on-line verified 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 signal acts, or directly obtains the gas density value, the contact signal action value of the on-line verified gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;
The intelligent control unit firstly closes the normally closed valve and then opens the gas source normally closed valve, then controls the gas source generating unit to enable the gas source generating unit to start a working mode, enables gas pressure to slowly rise, enables the on-line verified gas density relay to generate contact signal reset, enables the contact signal reset to be transmitted to the intelligent control unit through the on-line verified contact signal sampling unit, enables the intelligent control unit to obtain a gas density value according to a pressure value and a temperature value when the contact signal is reset, or directly obtains the gas density value, detects a contact signal return value of the on-line verified gas density relay, and completes verification work of the contact signal return value of the on-line verified gas density relay;
After all the contact signal checking work is completed, the intelligent control unit is controlled to resume operation to a normal working state: the air source generating unit is in a stop working mode, the air source normally-closed valve and the normally-closed valve are both in a closed state, and the normally-open valve is in an open state; and meanwhile, the intelligent control unit also adjusts the on-line checking contact signal sampling unit to a working state, and the contact signal control loop of the on-line checked gas density relay resumes operation to the normal working state.
18. The on-line verification method of a gas density relay on-line verification device according to claim 16 or 17, comprising: the intelligent control unit acquires a gas density value P 20 acquired by the gas density detection sensor, and if the gas density value P 20 is more than or equal to a preset threshold value, the intelligent control unit controls and opens a normally closed valve to reduce the gas pressure, and simultaneously, the intelligent control unit sends out an abnormal signal and/or information of the excessive pressure; or alternatively
The intelligent control unit acquires the gas pressure value P acquired by the gas density detection sensor, and if the pressure value P is more than or equal to a preset threshold value, the intelligent control unit controls and opens the normally closed valve to enable the gas pressure to drop, and meanwhile, the intelligent control unit sends out abnormal signals and/or information of the excessive pressure.
19. The on-line verification method of a gas density relay on-line verification device according to claim 16 or 17, wherein the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor, or the gas density detection sensor adopts a gas density transmitter composed of a pressure sensor and a temperature sensor; the online verification method further comprises the following steps:
When the normally open valve is in a closed state, the on-line check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, the intelligent control unit controls and opens the normally closed valve, so that when the gas pressure slowly drops to a zero position, the intelligent control unit receives a pressure signal P 0 collected by the pressure sensor, and if the pressure difference |P 0 -0| is not less than or equal to a preset threshold value, the intelligent control unit sends out a signal and/or information of abnormal zero position deviation of the pressure sensor.
20. The on-line verification method of a gas density relay on-line verification device according to claim 16 or 17, wherein the on-line verification device further comprises a gas leakage alarm contact, the gas leakage alarm contact is connected in series or in parallel with the alarm contact of the on-line verified gas density relay, and the gas leakage alarm contact is further connected with an intelligent control unit; the online verification method further comprises the following steps:
Closing the normally open valve under the control of the intelligent control unit in a set time period, wherein the intelligent control unit monitors the gas density value P 20 through the gas density detection sensor, the gas density value P 20 is found to be gradually smaller through calculation processing, and the intelligent control unit sends out a gas leakage alarm contact signal and/or information through the gas leakage alarm contact; or the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, and the gas pressure value P is found to be gradually reduced through calculation processing, and the intelligent control unit sends out a gas leakage alarm joint signal and/or information through the gas leakage alarm joint.
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| CN202010354529.9A CN111443283B (en) | 2020-04-29 | 2020-04-29 | Online verification device and online verification method for gas density relay |
| PCT/CN2021/076134 WO2021218288A1 (en) | 2020-04-29 | 2021-02-09 | Online checking apparatus for gas density relay and online checking method thereof |
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| CN111443283B (en) * | 2020-04-29 | 2024-05-10 | 上海乐研电气有限公司 | Online verification device and online verification method for gas density relay |
| CN112994224B (en) * | 2021-03-12 | 2024-06-25 | 上海乐研电气有限公司 | Power supply for gas density monitoring device, implementation method and transformation method thereof |
| CN114200293B (en) * | 2021-11-22 | 2023-09-05 | 贵州电网有限责任公司 | Compressed air type density relay calibration device |
| CN114167269A (en) * | 2021-11-28 | 2022-03-11 | 厦门加华电力科技有限公司 | SF (sulfur hexafluoride)6Density relay first pressure drop checking device |
| CN114777022A (en) * | 2022-04-07 | 2022-07-22 | 国网冀北电力有限公司张家口供电公司 | Pressure regulating device, electrical equipment gas density diagnosis and control system and method |
| CN115902611B (en) * | 2022-11-24 | 2024-03-19 | 国网四川省电力公司映秀湾水力发电总厂 | Relay calibration method, device and calibrator |
| CN117250494A (en) * | 2023-10-30 | 2023-12-19 | 中核检修有限公司 | Thermal relay verification method, thermal relay verification device, computer equipment and readable storage medium |
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