CN110927566A - Gas density relay with online self-checking function and checking method thereof - Google Patents

Gas density relay with online self-checking function and checking method thereof Download PDF

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Publication number
CN110927566A
CN110927566A CN201911333673.8A CN201911333673A CN110927566A CN 110927566 A CN110927566 A CN 110927566A CN 201911333673 A CN201911333673 A CN 201911333673A CN 110927566 A CN110927566 A CN 110927566A
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CN
China
Prior art keywords
gas density
gas
density relay
pressure
relay body
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CN201911333673.8A
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Chinese (zh)
Inventor
罗立波
常敏
黄小泵
夏铁新
郭正操
曾伟
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Shanghai Leyan Electric Co Ltd
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Shanghai Leyan Electric Co Ltd
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Priority to CN201911333673.8A priority Critical patent/CN110927566A/en
Publication of CN110927566A publication Critical patent/CN110927566A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/28—Compensation for variation of ambient pressure or temperature

Abstract

The application provides a gas density relay with online self-checking function and a checking method thereof, and the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure adjusting mechanism, a gas flow current limiting piece, an online checking contact signal sampling unit and an intelligent control unit. During the check-up, the gas flow through gas flow current-limiting piece flow direction gas density relay body is not enough to compensate the pressure drop that pressure adjustment mechanism adjusted gas density relay body in step, thereby accomplish the gas pressure drop of gas density relay body, make gas density relay body take place the contact action, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, the density value when the intelligence is controlled the unit according to the contact action, detect out the contact signal action value and/or the return value of gas density relay body, need not control the valve, need not the maintainer can accomplish online check-up to the scene, realize non-maintaining, the reliability of electric wire netting has been improved, and the cost is reduced.

Description

Gas density relay with online self-checking function and checking method thereof
Technical Field
The invention relates to the technical field of electric power, in particular to a gas density relay with an online self-checking function and a checking method thereof, which are applied to high-voltage and medium-voltage electrical equipment.
Background
At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas has the functions of arc extinction and insulation in the high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.
With the development of the unattended transformer substation towards networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and for this reason, the application of a gas density monitoring system (gas density relay) is developed vigorously. 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 transmitted to target equipment (such as a computer terminal) in time to realize online monitoring.
The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, 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 calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the working efficiency is greatly improved, and the operation and maintenance cost is greatly reduced. In order to avoid the need of an electric control valve, the sealing performance of the valve is better, the volume is smaller, the reliability is improved, the valve is beneficial to popularization and application, and new innovation is needed.
Disclosure of Invention
The invention aims to provide a gas density relay with an online self-checking function and a checking method thereof, so as to solve the problems in the technical background.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present application provides a gas density relay with an online self-checking function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting piece, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
one end of the gas flow limiting piece is provided with an interface connected with electrical equipment, and the other end of the gas flow limiting piece is communicated with the gas path of the gas density relay body, or the other end of the gas flow limiting piece is connected with the gas path of the pressure regulating mechanism, so that the gas flow limiting piece is communicated with the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting piece is not enough to synchronously compensate the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
The second aspect of the present application provides a gas density monitoring device with an online self-calibration function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting piece, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
one end of the gas flow limiting piece is provided with an interface connected with electrical equipment, and the other end of the gas flow limiting piece is communicated with the gas path of the gas density relay body, or the other end of the gas flow limiting piece is connected with the gas path of the pressure regulating mechanism, so that the gas flow limiting piece is communicated with the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting piece is not enough to synchronously compensate the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
Preferably, at the same time, the gas flow rate of the gas flow limiting piece flowing to the gas density relay body is Q1, the gas flow rate of the gas flowing out of or/and diffusing into the pressure regulating mechanism caused by the pressure drop of the gas density relay body regulated by the pressure regulating mechanism is Q2, Q2 is greater than Q1, and Q2/Q1 is a set value.
Preferably, the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece and/or the adjusting flow of the pressure adjusting mechanism.
Preferably, the intelligent control unit automatically matches the adjusting speed of the pressure adjusting mechanism according to the gas pressure of the gas flow limiting piece during verification. Specifically, when the gas pressure of the gas flow limiting piece is low, the adjusting speed of the pressure adjusting mechanism is slow; and when the gas pressure is high, the adjusting speed of the pressure adjusting mechanism is high.
Preferably, the pressure regulating mechanism slowly increases or decreases the load when the gas density relay body is pressurized or depressurized according to the flow rate of the gas flow restriction; when the contact signal action value of the gas density relay body is measured, the load change speed is not more than 15 per second of the measuring range when the contact signal action value is close to the action value, and the pressure can be stably increased or decreased.
Preferably, the gas flow restriction is a capillary tube, and/or a gas flow controller, or is a microporous element, or is a molecular sieve.
Preferably, the gas flow restriction is provided on the gas density relay body or on the pressure regulating mechanism.
Preferably, the gas density relay or the gas density monitoring device further comprises an inertia gas chamber, the inertia gas chamber is a sealed gas chamber, the inertia gas chamber is communicated with a gas path of the gas density relay body through a first gas path and is communicated with a gas path of the pressure regulating mechanism through a second gas path, and the inertia gas chamber is further communicated with the other end of the gas flow limiting piece; the inertia gas chamber is configured to control a load change speed at the time of gas pressure regulation.
More preferably, the volume of the inertial gas chamber is far larger than the sum of the volumes of the gas passages of other parts.
More preferably, the aperture of the air passage of the gas flow restriction is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the second air passage.
More preferably, the inertia gas chamber is made of a metal material or a non-metal material having a good sealing property.
More preferably, the air passage of the pressure regulating mechanism is further hermetically connected with one end of a third air passage through a one-way valve, the other end of the third air passage is provided with an interface connected with the electrical equipment, and the one-way valve is used for controlling the air flow of the pressure regulating mechanism to the electrical equipment.
Further, the aperture of the air passage of the gas flow limiting piece is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the third air passage.
Preferably, the gas density relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
More preferably, the gas circuit of the pressure regulating mechanism is communicated with the pressure detector; the other end of the gas flow limiting piece is communicated with the base and the pressure detector, or the other end of the gas flow limiting piece is communicated with the base and the pressure detector through a gas circuit connected with the pressure adjusting mechanism; and the online check contact signal sampling unit is connected with the signal generator.
More preferably, at least one of the temperature sensors is arranged near or on or integrated in a temperature compensation element of the gas density relay body. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay body, which is close to the temperature compensation element.
More preferably, the gas density relay body further comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with a display of the value.
More preferably, the gas density relay body or the gas density monitoring device further includes a contact resistance detection unit; the contact resistance detection unit is connected with the contact point signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay body is isolated from a control loop of the gas density relay body, and when the contact signal acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay body.
More preferably, the gas density relay body or the gas density monitoring device further includes an insulation resistance detection unit; the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the gas density relay acts and/or receives an instruction of detecting the contact insulation resistance, the insulation resistance detecting unit can detect the contact insulation resistance value of the gas density relay.
Preferably, the gas density detection sensor is provided on the gas density relay body; or the pressure regulating mechanism is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism gas density detection sensor online check contact signal sampling unit with the intelligence is controlled the unit and is set up on the gas density relay body.
More preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
Preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; alternatively, the first and second electrodes may be,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,
a density detection sensor adopting quartz tuning fork technology.
Preferably, the pressure adjusting mechanism is a gas chamber, a heating element and/or a refrigerating element are arranged outside or inside the gas chamber, and the temperature of the gas in the gas chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a cavity with one end opened, and the other end of the cavity is communicated with the gas density relay body; 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 further drive the piston to move in the cavity; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is an air chamber, a piston is arranged in the air chamber and is in sealing contact with the inner wall of the air chamber, a driving part is arranged outside the air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the driving of the driving part; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve or other deflation valves realized in an electric or gas mode; alternatively, the first and second electrodes may be,
the pressure regulating mechanism is a compressor; alternatively, the first and second electrodes may be,
the pressure regulating mechanism is a pump, and the pump comprises but is not limited to one of a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a pressure increasing valve;
wherein the driving component includes, but is not limited to, one of magnetic force, motor, reciprocating mechanism, carnot cycle mechanism, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, chemical reaction thrust mechanism, and pneumatic element.
More preferably, the pressure adjusting mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the air chamber.
Preferably, the online verification contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a gas density relay body, or a gas path isolation pressure adjusting mechanism, or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from the contact of the gas density relay body on a circuit through an isolation sampling element; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay body through an isolation sampling element, and connects the contact of the gas density relay body with the intelligent control unit; preferably, the isolated sampling element includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler, and a thyristor.
Preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay body to satisfy the following conditions: the online check contact signal sampling unit is provided with at least two groups of independent sampling contacts, can automatically check at least two contacts simultaneously, and continuously measures without replacing the contacts or reselecting the contacts; wherein the content of the first and second substances,
the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value or the switching value of the contact signal action value of the gas density relay body to be not lower than 24V, namely, during verification, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish gas density relay or gas density monitoring devices are to the on-line monitoring of the gas density of the electrical equipment who monitors.
More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay or the gas density monitoring device; alternatively, the first and second electrodes may be,
the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay or gas density monitoring devices's online check-up.
Preferably, the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; alternatively, the first and second electrodes may be,
the gas density relay body has the pressure value output signal of comparing, should compare pressure value output signal with the intelligence is controlled the unit and is connected.
Preferably, the gas density relay or gas density monitoring device further comprises: the gas density relay body, the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way joint; alternatively, the first and second electrodes may be,
the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way joint; alternatively, the first and second electrodes may be,
the gas density relay body, the gas density detection sensor, the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way connector.
More preferably, the gas density relay or gas density monitoring apparatus further comprises: the self-sealing valve is arranged between the multi-way joint and the gas flow limiting piece; or the gas flow limiting piece is arranged between the multi-way joint and the self-sealing valve.
Further, the gas density relay or the gas density monitoring apparatus further includes: the air supply interface is arranged on the pressure adjusting mechanism; or the air supply interface is arranged on the electrical equipment; or the air supply interface is arranged on the multi-way joint; or the air supply interface is arranged on the gas flow limiting piece.
Preferably, the gas density relay or gas density monitoring device further comprises: the temperature adjusting mechanism is a temperature-adjustable adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body, and then the gas density relay body is enabled to generate contact signal action by matching or/and combining with a gas circuit blocking pressure adjusting mechanism; the intelligent control unit is connected with the temperature adjusting mechanism to complete the control of the temperature adjusting mechanism.
More preferably, the temperature adjustment mechanism is a heating element; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism is a miniature thermostat;
the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors;
the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
Preferably, the online verification of the gas density relay is completed by at least two gas density relay bodies, at least two gas density detection sensors, at least two pressure regulating mechanisms, at least two gas flow limiting pieces, at least two online verification contact signal sampling units and an intelligent control unit; alternatively, the first and second electrodes may be,
at least two gas density relay bodies, at least two gas density detection sensors, at least two gas flow current-limiting pieces, at least two online check contact signal sampling units, an intelligent control unit and a pressure adjusting mechanism are used for completing the online check of the gas density relay.
Preferably, the gas density relay or the gas density monitoring device further comprises an acoustic alarm and/or an optical alarm, the acoustic alarm and/or the optical alarm are connected with the intelligent control unit, and the acoustic alarm and/or the optical alarm act when one of the collected values of the intelligent control unit is abnormal; the collected values include, but are not limited to, pressure values, temperature values, density values, contact signal action values and/or contact signal return values of the gas density relay body.
Preferably, the gas density detection sensor comprises at least one pressure sensor, at least one temperature sensor.
Specifically, the pressure sensor may be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative 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 Badon tube), a resistance pressure sensor (such as a pressure sensor with a slide wire resistor of a Badon tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.
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 pressure sensor, the calibration result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing the calibration result, and the calibration result is converted into the corresponding relative pressure value at 20 ℃; when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃; the conversion relation between the absolute pressure value and the relative pressure value is as follows:
Pabsolute pressure＝PRelative pressure+PStandard atmospheric pressure。
Preferably, the gas density relay body includes, but is not limited to, a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.
Specifically, the electrical equipment comprises a GIS, a GIL, a PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an inflatable cabinet and a ring main unit.
Preferably, the intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises 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, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control main board, an embedded main control board and the like, and includes all peripherals, logics, input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.
Preferably, the gas density relay or the gas density monitoring device supports basic information input, and the basic information comprises one or more of a factory number, a precision requirement, a rated parameter, a manufacturing plant and an operation position.
Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the verification result in a long distance.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode comprises 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.
Furthermore, the wireless communication mode comprises one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar.
Preferably, a clock is further arranged on the intelligent control unit, and the clock is configured to be used for regularly setting the verification time of the gas density relay body, or recording the test time, or recording the event time.
Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.
More preferably, the gas density relay or the gas density monitoring device completes the online verification of the gas density relay body according to the setting or the instruction of the background; or, completing the online verification of the gas density relay body according to the set verification time of the gas density relay body.
Preferably, the gas density relay or the gas density monitoring device further includes: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.
Preferably, the gas density relay or the gas density monitoring device further includes: and the camera is used for monitoring.
Preferably, the gas density relay or gas density monitoring device further comprises: respectively with the gas density relay body with the little water sensor that the unit is connected is controlled to the intelligence, and/or respectively with the gas density relay body with the decomposition thing sensor that the unit is connected is controlled to the intelligence.
More preferably, the gas density relay or gas density monitoring apparatus further comprises: gas circulation mechanism, gas circulation mechanism respectively with the gas density relay body with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element.
Further, the micro water sensor can be installed in a sealed chamber of the gas circulation mechanism, in a capillary, at a capillary port, and outside the capillary.
The third aspect of the present application provides a method for verifying a gas density relay, including:
in a normal working state, the gas density relay monitors the gas density value in the electrical equipment;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time and the gas density value condition under the condition that the gas density relay is allowed to be checked:
the intelligent control unit controls the adjusting speed of the pressure adjusting mechanism and/or adjusts the flow rate, so that the gas flow flowing to the gas density relay body through the gas flow current limiting piece is insufficient for synchronous compensation, the pressure adjusting mechanism adjusts the pressure drop of the gas density relay body, and therefore the gas pressure drop of the gas density relay body is completed, the gas density relay body generates contact signal actions, the contact actions are transmitted to the intelligent control unit through the online checking 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 actions, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and the checking work of the contact signal action value of the gas density relay body is completed;
after all contact signal verification work is finished, the intelligent control unit stops the pressure adjusting mechanism or restores the pressure adjusting mechanism to the initial verification state.
Preferably, a method for verifying a gas density relay includes:
in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time and the gas density value condition under the condition that the gas density relay is allowed to be checked:
the online check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, the online check contact signal sampling unit cuts off a contact signal control loop of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit;
the intelligent control unit controls the adjusting speed of the pressure adjusting mechanism and/or adjusts the flow rate, so that the gas flow flowing to the gas density relay body through the gas flow current limiting piece is insufficient for synchronous compensation, the pressure adjusting mechanism adjusts the pressure drop of the gas density relay body, and therefore the gas pressure drop of the gas density relay body is completed, the gas density relay body generates contact signal actions, the contact actions are transmitted to the intelligent control unit through the online checking 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 actions, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and the checking work of the contact signal action value of the gas density relay body is completed;
the intelligent control unit drives or stops the pressure adjusting mechanism to enable the gas pressure to rise, so that the gas density relay body is subjected to contact resetting, the contact resetting is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset or directly obtains the gas density value, a contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay body is completed;
after all the contact signal verification work is finished, the intelligent control unit stops the pressure adjusting mechanism, or restores the pressure adjusting mechanism to the initial verification state, or restores the pressure adjusting mechanism to the normal operation state; and adjust online check-up contact signal sampling unit to operating condition, the contact signal control circuit of gas density relay body resumes to operation normal operating condition.
In the above aspect of the present invention, it is more preferable that, at the same time, the gas flow rate flowing to the gas density relay body from the gas flow rate restrictor is Q1, the gas flow rate flowing out of and/or diffusing into the pressure adjusting mechanism due to the pressure drop of the gas density relay body from the pressure adjusting mechanism is adjusted by the pressure adjusting mechanism is Q2, Q2 > Q1, and Q2/Q1 is a set value.
In the above aspect of the present invention, preferably, Q1 is a constant value, and the operation of the pressure adjusting mechanism, for example, the adjusting speed of the pressure adjusting mechanism, is controlled according to the required value of Q2/Q1.
In the above-mentioned aspect of the present invention, it is preferable that the value of Q1 is adjusted to a predetermined value, and the operation of the pressure adjusting mechanism is controlled, for example, the adjusting speed of the pressure adjusting mechanism is controlled, according to the desired value of Q2/Q1.
In the above aspect of the present invention, preferably, Q2 is constant, and the gas flow rate Q1 of the gas flow rate limiter is controlled to reach the required value of Q2/Q1.
In the above context of the present invention, it is preferred to adjust Q1 and Q2 simultaneously or separately to achieve the desired values of Q2/Q1.
Preferably, the flow rate of the gas flow limiting piece is designed in a way of being matched with the adjusting speed and the adjusting flow rate of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the flow of the gas flow limiting piece is matched with the adjusting speed of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the flow of the gas flow limiting piece is matched with the adjusting flow of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece and/or the adjusting flow of the pressure adjusting mechanism.
Preferably, the intelligent control unit automatically matches the adjusting speed of the pressure adjusting mechanism according to the gas pressure of the gas flow limiting piece during verification. Specifically, when the gas pressure is low, the adjustment speed of the pressure adjustment mechanism is slow; and when the gas pressure is high, the adjusting speed of the pressure adjusting mechanism is high.
Preferably, the method for verifying the gas density relay further comprises the following steps:
the method comprises the following steps of communicating an inertia gas chamber with a gas path of a gas density relay body through a first gas path, communicating the inertia gas chamber with a gas path of a pressure regulating mechanism through a second gas path, and communicating the inertia gas chamber with the other end of a gas flow limiting piece; the inertial gas chamber is a sealed gas chamber configured to control a load change speed at the time of gas pressure regulation.
More preferably, the volume of the inertial gas chamber is far larger than the sum of the volumes of the gas passages of other parts.
More preferably, the aperture of the air passage of the gas flow restriction is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the second air passage.
More preferably, the inertia gas chamber is made of a metal material or a non-metal material having a good sealing property.
More preferably, the air passage of the pressure regulating mechanism is further hermetically connected with one end of a third air passage through a one-way valve, the other end of the third air passage is provided with an interface connected with the electrical equipment, and the one-way valve is used for controlling the air flow of the pressure regulating mechanism to the electrical equipment.
Further, the aperture of the air passage of the gas flow limiting piece is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the third air passage.
Preferably, the gas flow restriction is a capillary tube, and/or a gas flow controller, or is a microporous element, or is a molecular sieve.
Preferably, the gas flow restriction is provided on the gas density relay body or on the pressure regulating mechanism.
Preferably, the contact signal comprises an alarm, and/or a latch.
Preferably, 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; alternatively, a density detection sensor using quartz tuning fork technology.
Preferably, after the gas density relay is checked, if the gas density relay is abnormal, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.
Preferably, the verification method further comprises: and displaying the gas density value and the verification result on site or on the background.
Preferably, the verification method further comprises: the intelligent control unit is controlled through field control and/or background control.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the application provides a gas density relay with online self-checking function and a checking method thereof, which are used for high-voltage and medium-voltage electrical equipment and comprise a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow current limiting piece, an online checking contact signal sampling unit and an intelligent control unit. During the check-up, the regulation speed of unit control pressure adjustment mechanism is controlled to the intelligence, and/or the regulation flow, through the gas flow of gas flow current-limiting piece flow direction gas density relay body, be not enough synchronous compensation pressure adjustment mechanism adjusts the pressure of gas density relay body descends, thereby accomplishes the gas pressure of gas density relay body descends, makes the gas density relay body takes place the contact action, and the contact action is transmitted to the intelligence through online check-up contact signal sampling unit, and the intelligence is controlled the density value when the unit is moved according to the contact, detects out the warning of gas density relay body and/or shutting contact signal action value and/or return value, need not the maintainer to the check-up work that just can accomplish gas density relay on-the-spot, has improved the reliability of electric wire netting, has improved efficiency, the cost is reduced. Simultaneously, can also carry out the mutual self-calibration between gas density relay body and the gas density detection sensor through the intelligence accuse unit, realize the non-maintaining of the gas density relay who has online self-calibration function. Meanwhile, the whole verification process of the technology of the invention realizes SF6Zero emission of gas and meeting the requirements of environmental protection regulations. Especially, the air passage of the electrical equipment and the gas density relay body is not required to be separated by an electric control valve during verification, so that the sealing performance is better, the size is smaller, the field reconstruction is convenient, the reliability is improved, and the popularization and the application are facilitated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a gas density relay with an online self-checking function according to a first embodiment;
FIG. 2 is a schematic structural diagram of a gas density relay with an online self-checking function according to a second embodiment;
FIG. 3 is a schematic structural diagram of a gas density relay with an online self-checking function according to a third embodiment;
FIG. 4 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fourth embodiment;
FIG. 5 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fifth embodiment;
FIG. 6 is a schematic structural diagram of a gas density relay with an online self-checking function according to a sixth embodiment;
fig. 7 is a schematic structural diagram of a gas density relay with an online self-checking function according to a seventh embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1, a gas density relay or a gas density monitoring device with an online self-calibration function according to a first embodiment of the present invention includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas flow limiting piece 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent control unit 7, electrical equipment 8, an inertial air chamber 12 and a one-way valve 13. Pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6, intelligence accuse unit 7 and gas density relay body 1 set up together, and pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligence accuse unit 7 set up on gas density relay body 1 promptly. The gas density relay body 1 is communicated with an inertia gas chamber 12 through a gas passage 1A, and the inertia gas chamber 12The air nature chamber 12 is communicated with the electrical equipment 8 through the air flow limiting piece 4; the inertia air chamber 12 is communicated with the pressure adjusting mechanism 5 through an air passage 12A. The pressure adjusting mechanism 5 in this case is an air pump, the inertia air chamber 12 is communicated with an air suction hole (air inlet hole) 5A of the pressure adjusting mechanism 5 through an air passage 12A, an air outlet hole (air outlet hole) 5B of the pressure adjusting mechanism 5 is connected with a one-way valve 13, and the one-way valve 13 is communicated with the electrical equipment 8 through an air passage 13A. The check valve 13 functions to discharge (flow) only the gas of the pressure adjustment mechanism 5 to the electrical equipment 8 through its gas outlet hole (gas discharge hole) 5B, and the gas in the electrical equipment 8 cannot flow to the pressure adjustment mechanism 5. The inertia gas chamber 12 is a gas chamber with a proper volume, is made of a metal material or a non-metal material with good sealing performance, has a large enough volume, and can be adapted to the gas flow limiting piece 4 and the pressure adjusting mechanism 5. Firstly, because the gas volume contained in the gas density relay body 1 is small, the gas volume can be ignored during calculation, and the working principle is as follows: suppose that the mass of gas per second flowing from the electrical apparatus 8 through the gas flow restriction 4 into the inertia gas chamber 12 is QInto(ii) a By the action of the pressure regulating mechanism 5, the mass of gas flowing out of the inertial gas chamber 12 via the gas passage 12A per second is assumed to be QGo out(ii) a Assuming that the gas mass of the inertia gas chamber 12 is Q before the pressure adjusting mechanism 5 is not actuatedOriginally, the(ii) a The ratio of the change amount per second of the gas mass in the inertia gas chamber 12 to the original gas mass in the inertia gas chamber 12 after the pressure adjusting mechanism 5 is operated is (Q)Go out-QInto)/QOriginally, theDue to QOriginally, theWith the proper mass of gas (i.e., the proper volume of the inertial gas cell 12), it is relatively easy to achieve: the load change speed is not more than 15 per second of the measuring range, namely the pressure can be steadily increased or decreased. That is, the inertia gas chamber 12 has suitable gas pressure change inertia, and can easily realize that the load change speed is not more than 15 per mill of the measuring range per second. That is, when the inertia gas chamber 12 is configured to adjust the gas pressure, the load change speed thereof can be easily controlled. The gas flow restriction 4 may be a capillary tube, or a gas flow controller, or a microporous element, or a molecular sieve, in this case a capillary tube. Wherein the gas flow limiting piece 4 has small gas passage apertureThe aperture in the airway 1A; the aperture of the air passage 1A is smaller than that of the air passage 12A; the aperture of the airway 1A is smaller than the aperture of the airway 13A. For example, in this case, the design can be as follows: the aperture of the air passage of the air flow limiting piece 4 is 1mm, the aperture of the air passage 1A is 3mm, and the aperture of the air passage 12A is 6 mm; the aperture of the air passage 13A is 4mm or 3 mm. The gas density detection sensor is composed of a pressure sensor 2 and a temperature sensor 3, and the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the online check contact signal sampling unit 6 is connected with the gas density relay body 1 and the intelligent control unit 7 and is configured to sample contact signals of the gas density relay body; one end of the gas flow limiting piece 4 is provided with an interface communicated with the electrical equipment 8, and the other end of the gas flow limiting piece 4 is communicated with the gas density relay body 1 through an inertia gas chamber 12; the intelligence accuse unit 7, still respectively with gas density detection sensor's pressure sensor 2, temperature sensor 3 with pressure adjustment mechanism 5 is connected, is configured to accomplish pressure adjustment mechanism 5's control, pressure value collection and temperature value collection and/or gas density value collection, and detect the contact signal action value and/or the contact signal return value of gas density relay body 1.
During normal operating conditions, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment 8, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensors (2 and 3) and the intelligent control unit 7.
The gas density relay or the gas density monitoring device is under the condition of allowing the gas density relay body 1 to be verified according to the set verification time and the gas density value condition:
firstly, the online check contact signal sampling unit 6 is adjusted to a check state through the intelligent control unit 7. In a checking state, the online checking contact signal sampling unit 6 cuts off a contact signal control loop of the gas density relay body 1, and connects the contact of the gas density relay body 1 to the intelligent control unit 7; the intake air flow rate is made small by the gas flow rate restrictor 4,unit 7 control pressure adjustment mechanism 5 is controlled to intelligence (this case is the air pump), and pressure adjustment mechanism 5 adjusts pressure fast, regulates and control the flow simultaneously, and the gas pressure that can adjust inertia air chamber 12 descends slowly, and then can accomplish the gas pressure of gas density relay body 1 descends slowly, makes gas density relay body 1 takes place the contact signal action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and pressure value P, temperature value T when intelligence is controlled unit 7 and is moved according to the contact obtain gas density value P20Or directly obtaining the gas density value P20Detecting the contact signal operating value P of the gas density relay body 1D20Completing the contact signal action value P to the gas density relay body 1D20The verification work of (2).
Then, the pressure adjusting mechanism 5 is controlled by the intelligent control unit 7 to enable the gas pressure of the inertia gas chamber 12 to rise, and further the gas pressure of the gas density relay body 1 slowly rises, so that the gas density relay body 1 generates contact resetting, the contact resetting is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and the intelligent control unit 7 obtains a gas density value P according to a pressure value P and a temperature value T when the contact is reset20Or directly obtaining the gas density value P20Detecting the contact signal return value P of the gas density relay body 1F20Completing the contact signal return value P to the gas density relay body 1F20The verification work of (2).
After all the contact signal verification work is finished, the intelligent control unit 7 stops the pressure adjusting mechanism 5, or restores the pressure adjusting mechanism 5 to the initial verification state, or restores the pressure adjusting mechanism 5 to the normal operation state; and adjust online check-up contact signal sampling unit 6 to operating condition, the contact signal control circuit of gas density relay body 1 resumes to operation normal operating condition.
In order to make the volume of the gas density relay or the gas density monitoring device small, the volume of the pressure adjusting mechanism (air pump) 5 can be made small, in this embodiment, the check valve 13 is adopted, and through the action of the check valve 13, the gas of the inertia gas chamber 12 and the pressure adjusting mechanism 5 is discharged (flows) to the electrical equipment 8 through the gas outlet hole (exhaust hole) 5B, while the gas in the electrical equipment 8 cannot flow to the pressure adjusting mechanism 5, that is, the passage of the gas pressure adjusting mechanism 5 to the electrical equipment 8 is cut off. Thus, the pressure adjusting mechanism (air pump) 5 can exhaust (discharge to the electrical equipment 8) for multiple times, the air pressure of the inertia air chamber 12 rises and falls, the air pressure of the gas density relay body 1 slowly rises and falls, and the checking work of the contact point signal of the gas density relay body 1 is well completed.
After the gas density relay body 1 completes the checking work, the gas density relay judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the gas density relay can upload the data in an online remote transmission communication mode, for example, the data can be uploaded to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In a word, after the gas density relay 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 alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the calibration work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay body 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. The simple gas density relay is used for on-line calibration, and the result of abnormal calibration 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 an alarm signal contact and is regularly closed and opened, and the condition can be obtained through analysis; or through a separate verification signal line. The intelligent mobile phone can be uploaded in good state or in problem, or can be uploaded through remote density on-line monitoring, or can upload a verification result through a single verification signal line, or can be uploaded through on-site display, on-site alarm or wireless uploading and can be uploaded through the internet with the intelligent mobile phone. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and various combinations.
The gas density relay has a safety protection function, and particularly, when the gas density relay is lower than a set value, the gas density relay automatically does not perform online verification on the density relay any more and sends an announcement signal. For example, when the gas density value of the plant is less than the set value PSIt is not verified. For example: only when the gas density value of the equipment is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.
The gas density relay may be checked on line according to a set time, or may be checked on line according to a set temperature (for example, a limit high temperature, a limit low temperature, a normal temperature, 20 degrees, etc.). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.
The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods. Namely, the performances of the gas density relay and the electrical equipment are judged by comparing the temperature ranges in different periods. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay can be repeatedly verified for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated according to the verification result of each time. When necessary, the gas density relay can be checked on line at any time. Meanwhile, the density relay can also monitor the gas density value, and/or the pressure value, and/or the temperature value of the electrical equipment on line, and upload the gas density value, and/or the pressure value, and/or the temperature value to target equipment to realize on-line monitoring.
Gas density relay or gas density monitoring devices still include sound or/and light alarm, sound or/and light alarm are connected with the intelligence accuse unit, including when the intelligence accuse unit gather including, but not limited to pressure value, temperature value, density value, gas density relay body's contact signal action value and/or contact signal return value when one appears unusually, sound or/and light alarm action.
Example two:
as shown in fig. 2, a second gas density relay or gas density monitoring device with an online self-calibration function according to an embodiment of the present invention includes: gas density relay body 1, pressure sensor 2, temperature sensor 3, gas flow current-limiting piece 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, electrical equipment 8. Pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6, intelligence accuse unit 7 and gas density relay body 1 set up together, and pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligence accuse unit 7 set up on gas density relay body 1 promptly. According to the embodiment, the gas density relay body 1 is communicated with the inertia gas chamber 12 through the gas channel 1A, and the inertia gas chamber 12 is communicated with the electrical equipment 8 through the gas flow limiting piece 4; the inertia air chamber 12 is communicated with the pressure adjusting mechanism 5 through an air passage 12A. What is different from the first embodiment is that the pressure adjusting mechanism 5 in this case is a cavity 54 with one open end, and the other end of the cavity 54 is communicated with the inertia gas chamber 12 and further communicated with the gas density relay body 1; a piston 51 is arranged in the cavity 54, one end of the piston 51 is connected with an adjusting rod 53, the outer end of the adjusting rod 53 is connected with a driving part 52, the other end of the piston 51 extends into the opening and is in sealing contact with the inner wall of the cavity 54, and the driving part 52 (which can be a motor, a stepping motor or a reciprocating mechanism, a Carnot cycle mechanism, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism, a chemical reaction thrust generation mechanism or a pneumatic element, in this case, a stepping motor) drives the adjusting rod 53 to drive the piston 51 to move in the cavity 54; the piston 51 is in sealing contact with the inner wall of the chamber 54 via a seal 510.
When the inertia gas chamber 12 is configured to adjust the gas pressure, the load change speed thereof can be easily controlled. Wherein, the aperture of the air passage of the gas flow limiting piece 4 is smaller than that of the air passage 1A; the aperture of the airway 1A is smaller than the aperture of the airway 12A. For example, in this case, the design can be as follows: the aperture of the air passage of the air flow limiting piece 4 is 1mm, the aperture of the air passage 1A is 2mm, and the aperture of the air passage 12A is 4 mm. The gas density detection sensor is composed of a pressure sensor 2 and a temperature sensor 3, and the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path; the online check contact signal sampling unit 6 is connected with the gas density relay body 1 and the intelligent control unit 7 and is configured to sample a contact signal of the gas density relay body 1; the gas flow limiting piece 4 is a small-hole connecting piece, one end of the gas flow limiting piece 4 is provided with an interface communicated with the electrical equipment 8, and the other end of the gas flow limiting piece 4 is communicated with the gas density relay body 1 through an inertia gas chamber 12; the intelligence accuse unit 7, still respectively with gas density detection sensor's pressure sensor 2, temperature sensor 3 with pressure adjustment mechanism 5 is connected, is configured to accomplish pressure adjustment mechanism 5's control, pressure value collection and temperature value collection and/or gas density value collection, and detect the contact signal action value and/or the contact signal return value of gas density relay body 1.
During normal operating conditions, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensors (2 and 3) and the intelligent control unit 7.
The gas density relay or the gas density monitoring device is under the condition of allowing the gas density relay body 1 to be verified according to the set verification time and the gas density value condition:
firstly, the online check contact signal sampling unit 6 is adjusted to a check state through the intelligent control unit 7, and in the check state, the online check contact signal sampling unit 6 cuts off a contact signal control loop of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit 7; make the inlet flow little through gas flow current-limiting piece 4, the unit 7 control pressure adjustment mechanism 5 is controlled to intelligence, the drive part 52 of pressure adjustment mechanism 5, and then the drive adjust the pole 53 and drive the piston 51 is in move in the cavity 54. Because the driver part 52 of pressure adjustment mechanism 5 drives fast the piston 51 is in remove in the cavity 54, and then pressure regulation, its regulation flow is big simultaneously, and the gas pressure that can adjust inertia air chamber 12 descends slowly, and then can accomplish the gas pressure of gas density relay body 1 descends slowly, makes gas density relay body 1 takes place the contact signal action, and the contact action transmits intelligent control unit 7 through online check-up contact signal sampling unit 6, and pressure value P, temperature value T when intelligent control unit 7 moved according to the contact obtain gas density value P20Or directly obtaining the gas density value P20Detecting the contact signal operating value P of the gas density relay body 1D20Completing the contact signal action value P of the gas density relay body 1D20The verification work of (2).
Then, the pressure adjusting mechanism 5 is controlled by the intelligent control unit 7 to enable the gas pressure of the inertia gas chamber 12 to rise, and further the gas pressure of the gas density relay body 1 slowly rises, so that the gas density relay body 1 generates contact resetting, the contact resetting is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and the intelligent control unit 7 obtains a gas density value P according to a pressure value P and a temperature value T when the contact is reset20Or directly obtaining the gas density value P20Detecting the contact of the gas density relay body 1Point signal return value PF20Completing the contact signal return value P of the gas density relay body 1F20The verification work of (2).
After all the contact signal verification work is finished, the intelligent control unit 7 stops the pressure adjusting mechanism 5, or restores the pressure adjusting mechanism 5 to the initial verification state, or restores the pressure adjusting mechanism 5 to the normal operation state; and adjust online check-up contact signal sampling unit 6 to operating condition, the contact signal control circuit of gas density relay body 1 resumes to operation normal operating condition.
The flow of the gas flow limiting piece 4 is matched with the adjusting speed and the adjusting flow of the pressure adjusting mechanism 5; or the flow of the gas flow limiting piece 4 is designed to be matched with the adjusting speed of the pressure adjusting mechanism 5; or the flow of the gas flow limiting piece 4 is matched with the adjusting flow of the pressure adjusting mechanism 5; or, the intelligent control unit 7 can adjust the adjusting speed of the pressure adjusting mechanism 5 according to the flow or/and the gas pressure of the gas flow limiting piece 4; or, the intelligent control unit 7 can adjust the adjusting speed of the pressure adjusting mechanism 5 according to the flow or/and the gas pressure of the gas flow limiting piece 4 and/or the adjusting flow of the pressure adjusting mechanism 5. During the check-up, 7 control pressure adjustment mechanism's of unit regulation speed are controlled to the intelligence, and/or the regulation flow makes the gas flow who flows to gas density relay body 1 through gas flow current-limiting piece 4, is not enough synchronous compensation pressure adjustment mechanism 5 adjusts gas density relay body 1's pressure drop, thereby accomplishes gas density relay body 1's gas pressure drops, makes gas density relay body 1 takes place the contact signal action. The intelligent control unit 7 can automatically match the adjusting speed of the pressure adjusting mechanism 5 according to the gas pressure during verification. When the gas pressure is low, the adjusting speed of the pressure adjusting mechanism 5 is slow; when the gas pressure is high, the adjustment speed of the pressure adjustment mechanism 5 is high.
Example three:
as shown in fig. 3, a gas density relay or a gas density monitoring device with an online verification function includes a gas density relay body 1, where the gas density relay body 1 includes: the temperature-compensating device comprises a shell 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensating element 104, a plurality of signal generators 109, a movement 105, a pointer 106 and a dial 107 which are arranged in the shell 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator 109 and enables a contact of the signal generator 109 to be switched on or off. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay body 1 may further include a digital device or a liquid crystal device having an indication display.
In addition, the gas density relay with the online verification function further comprises: pressure sensor 2, temperature sensor 3, gas flow current-limiting piece 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The gas flow limiting piece 4 is a micro hole, one end of the gas flow limiting piece 4 is hermetically connected to the electrical equipment 8 through an electrical equipment connecting joint 110, and the other end of the gas flow limiting piece 4 is communicated with the base 102; the pressure sensor 2 is communicated with a pressure detector 103 on an air path; the pressure adjusting mechanism 5 is communicated with the pressure detector 103; the online check contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7; the pressure regulating mechanisms 5 are also respectively connected with an intelligent control unit 7.
The signal generator 109 comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 comprises a bourdon tube or a bellows; the temperature compensation element 104 is a temperature compensation sheet or a gas enclosed in a housing. The gas density relay body 1 of the present application may further include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge.
In the gas density relay body 1 of the present embodiment, the varying pressure and temperature are corrected based on the pressure detector 103 and by the temperature compensation element 104 to reflect the variation in the sulfur hexafluoride gas density. Under the pressure of the measured medium sulfur hexafluoride (SF6), due to the action of the temperature compensation element 104, when the density value of the sulfur hexafluoride gas changes, the pressure value of the sulfur hexafluoride gas also changes correspondingly, so that the end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the sulfur hexafluoride gas to be measured is indicated on the dial 107. The signal generator 109 serves as an output alarm lockout contact. Therefore, the gas density relay body 1 can display the density value of the sulfur hexafluoride gas. If the sulfur hexafluoride gas density value is reduced due to air leakage, the pressure detector 103 generates corresponding downward displacement and transmits the downward displacement to the movement 105 through the temperature compensation element 104, the movement 105 transmits the downward displacement to the pointer 106, the pointer 106 moves towards the direction with small indication value, and the air leakage degree is specifically displayed on the dial 107; meanwhile, the pressure detector 103 drives the beam to move downwards through the temperature compensation element 104, the adjusting piece on the beam gradually leaves the signal generator 109, and when the adjusting piece on the beam reaches a certain degree, the contact of the signal generator 109 is connected to send out a corresponding contact signal (alarm or lock), so that the sulfur hexafluoride gas density in equipment such as an electrical switch and the like is monitored and controlled, and the electrical equipment can work safely.
If the gas density value is increased, namely the pressure value of sulfur hexafluoride gas in the sealed gas chamber is greater than the set pressure value of the sulfur hexafluoride gas, the pressure value is correspondingly increased, the tail end of the pressure detector 103 and the temperature compensation element 104 generate corresponding upward displacement, the temperature compensation element 104 enables the beam to also displace upwards, the adjusting piece on the beam displaces upwards and pushes the contact of the signal generator 109 to be disconnected, and the contact signal is released.
In the above embodiments, the gas flow restriction 4 may be various and may include, but is not limited to, one of a capillary tube, and/or a gas flow controller, or a microporous member, or a molecular sieve. The design can be flexibly designed according to actual needs.
Type of pressure sensor 2: can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number can be several. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).
The temperature sensor 3 can be a thermocouple, a thermistor or a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.
The online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay body 1 acts during the calibration, the safe operation of the electrical equipment cannot be influenced; 2) the contact signal control loop of the gas density relay body 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.
The basic requirements or functions of the intelligent control unit 7 are as follows: the control and signal acquisition of the pressure regulating mechanism 5 are completed through the intelligent control unit 7, and if the gas flow limiting piece 4 adopts a gas flow controllerThen, the intelligent control unit 7 is used to control the gas flow restriction 4. The realization is as follows: can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts, and convert the pressure value and temperature value into the corresponding pressure value P at 20 DEG C20(density value), that is, the contact operating value P of the gas density relay body 1 can be detectedD20And the calibration work of the gas density relay body 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay body 1 can be directly detectedD20And the calibration work of the gas density relay body 1 is completed. Meanwhile, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay body 1, and the maintenance-free operation is realized. Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value output signal of gas density relay body 1, the density value at that time is gathered simultaneously to intelligence accuse unit 7, accomplishes the rated pressure value check-up of gas density relay body 1.
Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.
Gas density relay body 1, pressure sensor 2, temperature sensor 3, gas flow current-limiting piece 4, pressure adjustment mechanism 5, on-line check-up contact signal sampling unit 6, intelligence are controlled unit 7 and are led to and connect 9 between can set up as required in a flexible way. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; or the gas flow restriction 4 and the pressure regulating mechanism 5 may be provided together; in short, the arrangement between them can be flexibly arranged and combined. Can be as required, gas density relay body 1, gas density detection sensor (2, 3), pressure adjustment mechanism 5, gas flow current-limiting 4, online check-up contact signal sampling unit 6 and intelligent control unit 7 can carry out the nimble setting between them.
The working principle of the gas density relay with the online checking function for checking and monitoring is as follows:
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 P20(i.e., gas density value). When the density relay body 1 needs to be checked, if the gas density value P is detected at the moment20Not less than set safety check density value PS(ii) a The gas density relay just sends the instruction, controls the control circuit of unit 7 disconnection gas density relay body 1 through the intelligence promptly for can not influence electrical equipment 8's safe operation when online check-up gas density relay body 1, also can not be when the check-up, the mistake sends alarm signal, or shutting control circuit. Because the gas density value P is already carried out before the gas density relay body 1 starts to be verified20Not less than set safety check density value PSThe gas of the electrical equipment 8 is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Simultaneously, the unit 7 intercommunication gas density relay body 1's contact sampling circuit is controlled to the intelligence, then, the unit 7 control pressure adjustment mechanism 5's of intelligence drive assembly (can mainly adopt motor (motor) and gear to realize, its mode is various, nimble). The regulation speed of unit 7 control pressure adjustment mechanism 5 is controlled to the intelligence, and/or the regulation flow makes the gas flow who flows to gas density relay body 1 through gas flow current-limiting piece 4, is not enough synchronous compensation pressure adjustment mechanism 5 adjusts the pressure drop of gas density relay body 1. The volume of a cavity formed by the pressure regulating mechanism 5, the gas density relay body 1, the gas flow limiting piece 4 and the like is changed, the pressure of the gas density relay body 1 is gradually reduced, so that the gas density relay body 1 generates contact action, and the contact action is acquired through online checking contact signalsThe sample unit 6 is uploaded to the intelligent control unit 7, and the intelligent control unit 7 converts the pressure value and the temperature value measured according to the contact action into the pressure value P corresponding to 20 ℃ according to the gas characteristics20(density value), the contact point action value P of the gas density relay body 1 can be detectedD20After the contact action values of the alarm and/or locking signals of the gas density relay body 1 are detected, the intelligent control unit 7 controls the driving part of the pressure adjusting mechanism 5 to enable the pressure of the gas density relay body 1 to rise gradually, and the return value of the alarm and/or locking contact signals of the gas density relay body 1 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time, the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. While stopping the operation of the pressure adjusting mechanism 5. Through the control circuit of unit 7 intercommunication gas density relay body 1 is controlled to the intelligence, the normal work of density monitoring circuit of gas density relay body 1, and gas density of gas density relay body 1 safety monitoring electrical equipment makes gas equipment work safe and reliable. Therefore, the online checking work of the gas density relay body 1 can be conveniently completed, and the safe operation of the electrical equipment 8 can not be influenced when the gas density relay body 1 is checked online.
Example four:
as shown in fig. 4, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1 (the gas density relay body 1 mainly comprises a shell, and a base, a pressure detector, a temperature compensation element, a machine core, a pointer, a dial, an end seat, a plurality of signal generators and an electrical equipment connecting joint which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a gas flow current limiting piece 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7.
One end of the gas flow limiting piece 4 is hermetically connected to the electrical equipment 8 through an electrical equipment connecting joint 110, and the other end of the gas flow limiting piece 4 is communicated with the base of the gas density relay body 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on or in the shell of the gas density relay body 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay body 1; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7.
What distinguishes from the first embodiment is that the pressure adjustment mechanism 5 of this embodiment is the one end open-ended cavity, there is piston 51 in the cavity, piston 51 is equipped with sealing washer 510, piston 51's one end is connected with an adjusting lever, drive unit 52 is connected to the outer end of adjusting lever, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drives adjust the lever and then drive piston 51 is in the cavity removes, makes the sealed portion in the cavity take place the volume change, and then accomplishes the lift of pressure. The driving member 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or step motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
In another preferred embodiment, the pressure regulating mechanism 5 may also be a solenoid valve sealed inside a housing. The pressure regulating mechanism 5 controls the intelligent control unit 7 to open the electromagnetic valve, so that pressure changes and pressure rise and fall are completed.
In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a bellows and a driving part 52, and the bellows and the pressure detector of the gas density relay body 1 are hermetically connected together to form a reliable sealed cavity. The pressure adjusting mechanism 5 controls the intelligent control unit 7, so that the driving part 52 pushes the corrugated pipe to change in volume, and then the sealed cavity changes in volume, thereby completing pressure rise and fall.
In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a gas chamber, a heating element and a heat insulating member, wherein the heating element is provided outside (or inside) the gas chamber, and the temperature is changed by heating, thereby completing the pressure rise and fall.
Of course, the pressure adjusting mechanism 5 may have various other forms, which are not limited to the above-mentioned forms, and other mechanisms capable of realizing the pressure lifting function are also covered in the protection scope of the present application.
Through this pressure adjustment mechanism 5 regulation pressure for the contact action takes place for the signal generator of gas density relay body 1, the contact action is transmitted to intelligence through online check contact signal sampling unit 6 and is controlled unit 7, the gas density value when intelligence is controlled unit 7 and is taken place the contact action according to gas density relay body 1, perhaps convert into corresponding gas density value according to pressure value and temperature value, detect the warning of gas density relay and/or block contact signal action value and/or return value, accomplish gas density relay's check-up work. Or the checking work of the gas density relay is finished as long as the alarm and/or the locking contact action value is obtained through detection.
Example five:
as shown in fig. 5, compared with the fourth embodiment, the present embodiment adds a gas make-up interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve 11 is communicated with one end of the gas flow limiting piece 4 and the gas supplementing interface 10 through a connecting pipe.
Example six:
as shown in fig. 6, a gas density relay or a gas density monitoring device with an online self-checking function is different from the fourth embodiment in that: the other end of the gas flow limiting piece 4 is connected with the gas circuit of the pressure regulating mechanism 5 through a connecting pipe, so that the gas flow limiting piece 4 is communicated with the base of the gas density relay body 1 and the pressure detector. Of course, the sixth embodiment can also add an air supplement interface and a self-sealing valve. For example, one end of the self-sealing valve is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve is communicated with one end of the gas flow limiting piece 4 and the gas supplementing interface through a connecting pipe. If gas flow current-limiting piece 4 adopts gas flow controller, gas flow current-limiting piece 4 is connected with intelligent control unit 7, accomplishes the control to gas flow current-limiting piece 4 through intelligent control unit 7.
Example seven:
as shown in fig. 7, a gas density relay or a gas density monitoring device with an online self-calibration function includes: gas density relay body 1, pressure sensor 2, temperature sensor 3, gas flow current-limiting piece 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. One end of the gas flow limiting piece 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the gas flow limiting piece 4 is communicated with the base of the gas density relay body 1, the pressure sensor 2 and the pressure adjusting mechanism 5. The pressure sensor 2, the temperature sensor 3, the gas flow limiting piece 4 and the pressure adjusting mechanism 5 are arranged on the rear side of the shell of the gas density relay body 1. And the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electrical equipment connecting joint. The pressure sensor 2 is communicated with the pressure detector on the gas path through a base of the gas density relay body 1; the pressure adjusting mechanism 5 is communicated with the pressure detector of the gas density relay body 1. The pressure sensor 2, the temperature sensor 3 and the pressure adjusting mechanism 5 are respectively connected with the intelligent control unit 7. Different from the third embodiment, the pressure sensor 2, the temperature sensor 3, the gas flow rate limiter 4 and the pressure adjusting mechanism 5 are arranged on the rear side of the housing of the gas density relay body 1. The gas flow restriction 4 is formed by a molecular sieve.
A gas density relay with on-line self-checking function generally refers to that its component elements are designed into an integral structure; the gas density monitoring device generally refers to that the components of the gas density monitoring device are designed into a split structure and flexibly formed.
In summary, the gas density relay with the online self-checking function and the checking method thereof provided by the invention are composed of a gas path (capable of passing through a pipeline) connecting part, a pressure adjusting part, a signal measurement control part and the like, and the main function is to perform online checking measurement on a contact signal (a pressure value during alarm/locking action) of the gas density relay at the ambient temperature, automatically convert the contact signal into a corresponding pressure value at 20 ℃, and realize performance detection on the contact (alarm and locking) value of the gas density relay online. The mounting positions of the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the pressure adjusting mechanism 5, the gas flow limiting piece 4, the online checking contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly combined. For example: the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 can be combined together, integrally designed and also designed in a split mode; can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. The gas flow restriction 4 may be connected directly to the electrical device 8, or may be connected via a self-sealing valve or a gas pipe. The pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 can be combined together and are designed integrally; the pressure sensor 2 and the temperature sensor 3 can be combined together and designed integrally; the online check joint signal sampling unit 6 and the intelligent control unit 7 can be combined together to form an integrated design. In short, the structure is not limited.
When the contact of the density relay is verified at the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃, the requirement for error judgment of the density relay can be different, and the method can be implemented according to the temperature requirement and the related standard; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay body can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay body. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the density relay body and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; and the insulation performance of the gas density relay body is also detected, or detected and judged. The gas flow restriction is one of capillary, gas flow controller, microporous member, or molecular sieve. The gas flow limiting piece is arranged on the gas density relay body, or on the pressure adjusting mechanism, or on the inertia gas chamber.
The anti-rust and anti-vibration device is compact and reasonable in structural arrangement, good in anti-rust and anti-vibration capacity of each part, firm in installation and reliable in use. The connection, the dismouting of each pipeline of gas density relay are easily operated, and equipment and part are convenient to be maintained. The gas density relay calibration device can complete the calibration work of the gas density relay without a maintainer going to the site, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims (33)

1. A gas density relay with an online self-checking function is characterized by comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting piece, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
one end of the gas flow limiting piece is provided with an interface connected with electrical equipment, and the other end of the gas flow limiting piece is communicated with the gas path of the gas density relay body, or the other end of the gas flow limiting piece is connected with the gas path of the pressure regulating mechanism, so that the gas flow limiting piece is communicated with the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting piece is not enough to synchronously compensate the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
2. A gas density monitoring device with an online self-checking function is characterized by comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a gas flow limiting piece, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
one end of the gas flow limiting piece is provided with an interface connected with electrical equipment, and the other end of the gas flow limiting piece is communicated with the gas path of the gas density relay body, or the other end of the gas flow limiting piece is connected with the gas path of the pressure regulating mechanism, so that the gas flow limiting piece is communicated with the gas path of the gas density relay body; the gas flow flowing to the gas density relay body through the gas flow limiting piece is not enough to synchronously compensate the pressure drop of the gas density relay body regulated by the pressure regulating mechanism;
the intelligent control unit is respectively connected with the pressure adjusting mechanism, the gas density detection sensor and the online check contact signal sampling unit, and is configured to complete control of the pressure adjusting mechanism, pressure value collection, temperature value collection and/or gas density value collection, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
3. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: in the same time, the gas flow rate of the gas flow limiting piece flowing to the gas density relay body is Q1, the gas flow rate of the gas flowing out of or/and diffused to the pressure adjusting mechanism caused by the pressure reduction of the gas density relay body is adjusted by the pressure adjusting mechanism to be Q2, Q2 is larger than Q1, and Q2/Q1 is a set value.
4. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece and/or the adjusting flow of the pressure adjusting mechanism.
5. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit automatically matches the adjusting speed of the pressure adjusting mechanism according to the gas pressure of the gas flow limiting piece during verification; preferably, when the gas pressure of the gas flow restriction is low, the adjusting speed of the pressure adjusting mechanism is slow; and when the gas pressure is high, the adjusting speed of the pressure adjusting mechanism is high.
6. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: according to the flow of the gas flow limiting piece, the pressure adjusting mechanism slowly increases or decreases the load when the gas density relay body is subjected to pressure increase or pressure reduction; when the action value of the contact signal of the gas density relay body is measured, the load change speed is not more than 15 per second of the measuring range when the action value is approached.
7. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas flow limiting piece is a capillary tube and/or a gas flow controller, or a microporous piece, or a molecular sieve.
8. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas flow limiting piece is arranged on the gas density relay body or on the pressure regulating mechanism.
9. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density relay further comprises an inertia gas chamber, the inertia gas chamber is a sealed gas chamber, the inertia gas chamber is communicated with a gas path of the gas density relay body through a first gas path and communicated with a gas path of the pressure regulating mechanism through a second gas path, and the inertia gas chamber is further communicated with the other end of the gas flow limiting piece; the inertia gas chamber is configured to control a load change speed at the time of gas pressure regulation.
10. The gas density relay or gas density monitoring device of claim 9, wherein: the volume of the inertial air chamber is far larger than the sum of the volumes of the air passages of other parts.
11. The gas density relay or gas density monitoring device of claim 9, wherein: the aperture of the air passage of the gas flow limiting piece is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the second air passage.
12. The gas density relay or gas density monitoring device of claim 9, wherein: the air passage of the pressure regulating mechanism is also connected with one end of a third air passage in a sealing way through a one-way valve, the other end of the third air passage is provided with an interface connected with electrical equipment, and the one-way valve is used for controlling the air flow of the pressure regulating mechanism to flow to the electrical equipment.
13. The gas density relay or gas density monitoring device of claim 12, wherein: the aperture of the air passage of the gas flow limiting piece is smaller than that of the first air passage, and the aperture of the first air passage is smaller than that of the third air passage.
14. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
15. The gas density relay or gas density monitoring device of claim 14, wherein: the gas path of the pressure regulating mechanism is communicated with the pressure detector; the other end of the gas flow limiting piece is communicated with the base and the pressure detector, or the other end of the gas flow limiting piece is communicated with the base and the pressure detector through a gas circuit connected with the pressure adjusting mechanism; and the online check contact signal sampling unit is connected with the signal generator.
16. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density detection sensor is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism gas density detection sensor online check contact signal sampling unit with the intelligence is controlled the unit and is set up on the gas density relay body.
17. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; alternatively, the first and second electrodes may be,
a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,
a density detection sensor adopting quartz tuning fork technology.
18. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the pressure regulating mechanism is an air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, and the temperature of the air in the air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a cavity with one end opened, and the other end of the cavity is communicated with the gas density relay body; 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 further drive the piston to move in the cavity; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is an air chamber, a piston is arranged in the air chamber and is in sealing contact with the inner wall of the air chamber, a driving part is arranged outside the air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the gas density relay body; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the driving of the driving part; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve or other deflation valves realized in an electric or gas mode; alternatively, the first and second electrodes may be,
the pressure regulating mechanism is a compressor; alternatively, the first and second electrodes may be,
the pressure regulating mechanism is a pump, and the pump comprises but is not limited to one of a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump; alternatively, the first and second electrodes may be,
the pressure adjusting mechanism is a pressure increasing valve;
wherein the driving component includes, but is not limited to, one of magnetic force, motor, reciprocating mechanism, carnot cycle mechanism, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, chemical reaction thrust mechanism, and pneumatic element.
19. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online check contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a gas density relay body, or a gas path isolation pressure adjusting mechanism, or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from the contact of the gas density relay body on a circuit through an isolation sampling element; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay body through an isolation sampling element, and connects the contact of the gas density relay body with the intelligent control unit; preferably, the isolated sampling element includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler, and a thyristor.
20. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish gas density relay or gas density monitoring devices are to the on-line monitoring of the gas density of the electrical equipment who monitors.
21. The gas density relay or gas density monitoring device of claim 20, wherein: the intelligent control unit adopts an averaging method to calculate the gas density value, and the averaging method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.
22. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay or the gas density monitoring device; alternatively, the first and second electrodes may be,
the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay or gas density monitoring devices's online check-up.
23. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density relay body, the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way joint; alternatively, the first and second electrodes may be,
the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way joint; alternatively, the first and second electrodes may be,
the gas density relay body, the gas density detection sensor, the gas flow limiting piece and the pressure adjusting mechanism are arranged on the multi-way connector.
24. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density relay comprises a gas circuit isolation pressure adjusting mechanism and a temperature adjusting mechanism, wherein the gas density relay also comprises a temperature adjusting mechanism which is a temperature-adjustable adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to be matched with or/and combined with the gas circuit isolation pressure adjusting mechanism to enable the gas density relay body to generate contact signal action; the intelligent control unit is connected with the temperature adjusting mechanism to complete the control of the temperature adjusting mechanism.
25. A gas density relay or a gas density monitoring device according to claim 24, wherein: the temperature adjusting mechanism is a heating element; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; alternatively, the first and second electrodes may be,
the temperature adjusting mechanism is a miniature thermostat;
the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors;
the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.
26. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online verification system comprises at least two gas density relay bodies, at least two gas density detection sensors, at least two pressure adjusting mechanisms, at least two gas flow limiting pieces, at least two online verification contact signal sampling units and an intelligent control unit, and is used for completing online verification of the gas density relay; alternatively, the first and second electrodes may be,
at least two gas density relay bodies, at least two gas density detection sensors, at least two gas flow current-limiting pieces, at least two online check contact signal sampling units, an intelligent control unit and a pressure adjusting mechanism are used for completing the online check of the gas density relay.
27. The gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control system is characterized by further comprising an acoustic alarm and/or an optical alarm, wherein the acoustic alarm and/or the optical alarm are connected with the intelligent control unit, and the acoustic alarm and/or the optical alarm act when one of the collected values of the intelligent control unit is abnormal; the collected values include, but are not limited to, pressure values, temperature values, density values, contact signal action values and/or contact signal return values of the gas density relay body.
28. A method for verifying a gas density relay, comprising:
in a normal working state, the gas density relay monitors the gas density value in the electrical equipment;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time and the gas density value condition under the condition that the gas density relay is allowed to be checked:
the intelligent control unit controls the adjusting speed of the pressure adjusting mechanism and/or adjusts the flow rate, so that the gas flow flowing to the gas density relay body through the gas flow current limiting piece is insufficient for synchronous compensation, the pressure adjusting mechanism adjusts the pressure drop of the gas density relay body, and therefore the gas pressure drop of the gas density relay body is completed, the gas density relay body generates contact signal actions, the contact actions are transmitted to the intelligent control unit through the online checking 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 actions, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and the checking work of the contact signal action value of the gas density relay body is completed;
after all contact signal verification work is finished, the intelligent control unit stops the pressure adjusting mechanism or restores the pressure adjusting mechanism to the initial verification state.
29. A method of verifying a gas density relay as claimed in claim 28, comprising: in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time and the gas density value condition under the condition that the gas density relay is allowed to be checked:
the online check contact signal sampling unit is adjusted to a check state through the intelligent control unit, and in the check state, the online check contact signal sampling unit cuts off a contact signal control loop of the gas density relay body and connects the contact of the gas density relay body to the intelligent control unit;
the intelligent control unit controls the adjusting speed of the pressure adjusting mechanism and/or adjusts the flow rate, so that the gas flow flowing to the gas density relay body through the gas flow current limiting piece is insufficient for synchronous compensation, the pressure adjusting mechanism adjusts the pressure drop of the gas density relay body, and therefore the gas pressure drop of the gas density relay body is completed, the gas density relay body generates contact signal actions, the contact actions are transmitted to the intelligent control unit through the online checking 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 actions, or directly obtains the gas density value, detects the contact signal action value of the gas density relay body, and the checking work of the contact signal action value of the gas density relay body is completed;
the intelligent control unit drives or stops the pressure adjusting mechanism to enable the gas pressure to rise, so that the gas density relay body is subjected to contact resetting, the contact resetting is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset or directly obtains the gas density value, a contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay body is completed;
after all the contact signal verification work is finished, the intelligent control unit stops the pressure adjusting mechanism, or restores the pressure adjusting mechanism to the initial verification state, or restores the pressure adjusting mechanism to the normal operation state; and adjust online check-up contact signal sampling unit to operating condition, the contact signal control circuit of gas density relay body resumes to operation normal operating condition.
30. A method of verifying a gas density relay as claimed in claim 28, comprising: the flow of the gas flow limiting piece is matched with the adjusting speed and the adjusting flow of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the flow of the gas flow limiting piece is matched with the adjusting speed of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the flow of the gas flow limiting piece is matched with the adjusting flow of the pressure adjusting mechanism; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece; alternatively, the first and second electrodes may be,
the intelligent control unit adjusts the adjusting speed of the pressure adjusting mechanism according to the gas flow or/and the gas pressure of the gas flow limiting piece and/or the adjusting flow of the pressure adjusting mechanism.
31. A method of verifying a gas density relay as claimed in claim 28, comprising: the intelligent control unit automatically matches the adjusting speed of the pressure adjusting mechanism according to the gas pressure of the gas flow limiting piece during verification; preferably, when the gas pressure is low, the adjusting speed of the pressure adjusting mechanism is slow; and when the gas pressure is high, the adjusting speed of the pressure adjusting mechanism is high.
32. A method of verifying a gas density relay as claimed in claim 28, comprising: the method comprises the following steps of communicating an inertia gas chamber with a gas path of a gas density relay body through a first gas path, communicating the inertia gas chamber with a gas path of a pressure regulating mechanism through a second gas path, and communicating the inertia gas chamber with the other end of a gas flow limiting piece; the inertia gas chamber is a sealed gas chamber and is configured to control the load change speed when the gas pressure is adjusted; preferably, the volume of the air chamber of the inertia air chamber is far larger than the sum of the volumes of the air passages of other parts.
33. A method of verifying a gas density relay as claimed in claim 28, comprising: the air passage of the pressure regulating mechanism is also connected with one end of a third air passage in a sealing way through a one-way valve, the other end of the third air passage is provided with an interface connected with electrical equipment, and the one-way valve is used for controlling the air flow of the pressure regulating mechanism to flow to the electrical equipment.
CN201911333673.8A 2019-12-23 2019-12-23 Gas density relay with online self-checking function and checking method thereof Pending CN110927566A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112146227A (en) * 2020-08-31 2020-12-29 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium
WO2021218286A1 (en) * 2020-04-29 2021-11-04 上海乐研电气有限公司 Gas density relay with online self-checking function, and checking method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021218286A1 (en) * 2020-04-29 2021-11-04 上海乐研电气有限公司 Gas density relay with online self-checking function, and checking method therefor
CN112146227A (en) * 2020-08-31 2020-12-29 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium
CN112146227B (en) * 2020-08-31 2022-04-12 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium

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