CN110426312B

CN110426312B - Online sampling check gas density relay with protection function

Info

Publication number: CN110426312B
Application number: CN201910830153.1A
Authority: CN
Inventors: 金海勇; 夏铁新; 黄小泵; 郭正操; 常敏; 王乐乐
Original assignee: Shanghai Roye Electric Co Ltd
Current assignee: Shanghai Roye Electric Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2024-07-23
Anticipated expiration: 2039-09-04
Also published as: CN110426312A

Abstract

The application provides an online sampling and checking gas density relay with a protection function, which comprises a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit. The on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, wherein the first connecting circuit is connected with the contact of the gas density relay body and the contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay body and the intelligent control unit; in a non-verification state, the second connecting circuit is opened, and the first connecting circuit is closed; the check state, first connecting circuit disconnection, intercommunication second connecting circuit are connected the contact and the intelligent control unit of gas density relay body, ensure that during the inspection, contact action signal does not upload, does not influence the safe operation of electric wire netting, realize gas density relay's maintenance-free simultaneously, improved the benefit greatly, improved the reliable safe operation of electric wire netting.

Description

Online sampling check gas density relay with protection function

Technical Field

The invention relates to the technical field of electric power, in particular to an on-line sampling and checking gas density relay with a protection function, which is applied to high-voltage and medium-voltage electrical equipment.

Background

The gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage electrical equipment, a contact signal control loop is arranged in the gas density relay, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage electrical equipment, when gas leakage is detected, a contact of the gas density relay acts to generate a contact signal, and the contact signal control loop gives an alarm or locks according to the contact signal, so that the safety operation protection of the electrical equipment is realized.

At present, SF ₆ (sulfur hexafluoride) electrical equipment is widely applied to the power departments and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the development of economy and high speed, the capacity of the power system in China is rapidly enlarged, and the use amount of SF ₆ electrical equipment is increased. The role of SF ₆ gas in high voltage electrical equipment is to quench and insulate, and the density reduction and micro water content of SF ₆ gas in high voltage electrical equipment would seriously affect the safe operation of SF ₆ high voltage electrical equipment if exceeding the standard: 1) A reduction in SF ₆ gas density to a certain extent will result in a loss of insulation and arc extinction properties. 2) Under the participation of some metal matters, SF ₆ gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF ₂, corrode insulating parts and metal parts, and generate a large amount of heat so as to raise the pressure of the gas chamber. 3) At reduced temperatures, excessive moisture may form condensation water, significantly reducing the insulation strength of the insulator surface and even flashover, causing serious damage. The grid operating code therefore mandates that the density and water content of SF ₆ gas must be periodically checked both before and during operation of the plant.

Along with the development of the unattended transformer station to the networking and digitalization directions and the continuous enhancement of the requirements on remote control and remote measurement, the method has important practical significance on-line monitoring of the gas density and micro water content state of SF ₆ electrical equipment. Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. Most of the prior high-voltage electrical equipment is SF ₆ gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to the safe operation. It is now very common to monitor the gas density value in SF ₆ high voltage electrical equipment on-line, for which gas density monitoring system (gas density relay) applications will be developing. Whereas current gas density monitoring systems (gas density relays) are basically: 1) The remote SF ₆ gas density relay is used for collecting density, pressure and temperature, uploading and on-line monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition, uploading and on-line monitoring of the density, the pressure and the temperature of the gas. SF ₆ gas density relay is a core and key component. However, because the field operation environment of the high-voltage transformer substation is bad, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote transmission SF ₆ gas density relay consists of a mechanical density relay and an electronic remote transmission part; in addition, in the power grid system using the gas density transmitter, the traditional mechanical density relay is reserved. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can timely transmit information to a target equipment terminal through a contact connection circuit when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be timely transmitted to target equipment (generally a computer terminal) to realize on-line monitoring.

The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the gas density relay from happening and ensuring the safe and reliable operation of the electrical equipment. Both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the verification of the gas density relay is very important and popular in the power system at present, and various power supply companies, power plants and large factories and mines are implemented. And power supply companies, power plants and large-scale factories and mines enterprises are required to be equipped with testers, equipment vehicles and SF ₆ gas with high value for completing the on-site verification and detection work of the gas density relay. The method comprises the steps of roughly calculating the power failure business loss during detection, wherein the annual allocated detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the field check of the inspector is not in normal operation, potential safety hazards exist. Therefore, innovation is very necessary in the existing gas density self-checking gas density relay, especially in the gas density on-line self-checking gas density relay or system, so that the gas density relay or the monitoring system for realizing on-line monitoring of the gas density also has the checking function of the gas density relay, thereby completing the periodic checking work of the (mechanical) gas density relay, without the need of maintenance personnel to go to the site, greatly improving the working efficiency and reducing the cost.

Disclosure of Invention

The invention aims to provide an on-line sampling and checking gas density relay with a protection function and a checking method thereof, so as to solve the problems in the technical background.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The first aspect of the present application provides an on-line sampling check gas density relay with protection function, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, an on-line check joint signal sampling unit and an intelligent control unit;

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 so as to enable the gas density relay body to generate contact signal actions;

the gas density detection sensor is communicated with the gas density relay body;

the on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, wherein the first connecting circuit is connected with a contact point of the gas density relay body and a contact point signal control loop, and the second connecting circuit is connected with the contact point of the gas density relay body and the intelligent control unit; in a non-verification state, the contact is a normally open type density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the on-line verification contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit, and connects the contact of the gas density relay body with the intelligent control unit; or in a non-checking state, the contact is a normally-closed density relay, the second connecting circuit is opened or isolated, and the first connecting circuit is closed; in a verification state, the on-line verification contact signal sampling unit closes the contact signal control loop, cuts off the connection between the contact of the gas density relay body and the contact signal control loop, and communicates the second connection circuit to connect the contact of the gas density relay body with the intelligent control unit;

The intelligent control unit is respectively connected with the gas density detection sensor, the temperature regulating mechanism and the on-line checking joint signal sampling unit and is configured to complete control of the temperature regulating mechanism, pressure value acquisition and temperature value acquisition and/or gas density value acquisition and detect a joint signal action value and/or a joint signal return value of the gas density relay body;

Wherein the contact signal includes an alarm, and/or a latch.

In a second aspect, the present application provides a gas density monitoring device with a protection function, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, an on-line check joint signal sampling unit and an intelligent control unit;

Wherein the contact signal includes an alarm, and/or a latch.

Preferably, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally-closed contact, the second relay is provided with at least one normally-open contact, and the normally-closed contact and the normally-open contact keep opposite switch states; the normally-closed contact is connected in series in the contact signal control loop, and the normally-open contact is connected to the contact of the gas density relay body;

In a non-verification state, the normally-closed contact is closed, the normally-open contact is opened, and the gas density relay monitors the output state of the contact in real time; in the verification state, the normally-closed contact is opened, the normally-open contact is closed, and the contact of the gas density relay body is connected with the intelligent control unit through the normally-open contact.

More preferably, the first relay and the second relay may be two independent relays or may be the same relay.

Preferably, the on-line checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a photoelectric coupler and a resistor, and the photoelectric coupler comprises a light emitting diode and a phototriode; the contact points of the light emitting diode and the gas density relay body are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is connected with the intelligent control unit, and the collector of the phototriode is also connected with a power supply through the resistor;

when the contact is closed, the closed loop is electrified, the light emitting diode emits light, the light turns on the phototriode, and the collector electrode of the phototriode outputs low level;

when the contact is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level.

Preferably, the on-line checking contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit comprises a first photoelectric coupler and a second photoelectric coupler;

The light emitting diodes of the first photoelectric coupler and the light emitting diodes of the second photoelectric coupler are respectively connected in parallel through current limiting resistors, and are connected in series with the contact of the gas density relay body to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler and the light emitting diodes of the second photoelectric coupler are opposite;

The collector of the phototriode of the first photoelectric coupler and the collector of the phototriode of the second photoelectric coupler are connected with a power supply through a voltage dividing resistor, the emitter of the phototriode of the first photoelectric coupler is connected with the emitter of the phototriode of the second photoelectric coupler to form an output end, and the output end is connected with the intelligent control unit and grounded through a resistor;

When the contact is closed, the closed loop is electrified, the first photoelectric coupler is conducted, the second photoelectric coupler is cut off, and the emitter of the phototriode of the first photoelectric coupler outputs a high level; or the first photoelectric coupler is cut off, the second photoelectric coupler is conducted, and the emitter of the phototriode of the second photoelectric coupler outputs high level;

When the contact is opened, the closed loop is powered off, the first photoelectric coupler and the second photoelectric coupler are both cut off, and the emitters of the phototriodes of the first photoelectric coupler and the second photoelectric coupler output low level.

More preferably, the contact sampling circuit further includes a first zener diode group and a second zener diode group, the first zener diode group and the second zener diode group are connected in parallel to the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.

Further, the first zener diode group comprises a first zener diode and a second zener diode which are connected in series, and the cathode of the first zener diode is connected with the anode of the second zener diode; the second zener diode group comprises a third zener diode and a fourth zener diode which are connected in series, and the positive electrode of the third zener diode is connected with the negative electrode of the fourth zener diode.

Preferably, the on-line checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a first hall current sensor and a second hall current sensor, the contacts of the first hall current sensor, the second hall current sensor and the gas density relay body are connected in series to form a closed loop, and the contacts of the gas density relay body are connected between the first hall current sensor and the second hall current sensor; the output end of the first Hall current sensor and the output end of the second Hall current sensor are connected with the intelligent control unit;

When the contact is closed, the closed loop is electrified, and current flows between the first Hall current sensor and the second Hall current sensor to generate induced potential;

when the contact is opened, the closed loop is powered off, no current flows between the first hall current sensor and the second hall current sensor, and the generated induced potential is zero.

Preferably, the on-line checking contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit comprises: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;

The first silicon controlled rectifier and the third silicon controlled rectifier are connected in series, the second silicon controlled rectifier and the fourth silicon controlled rectifier are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier and the third silicon controlled rectifier, one end of a contact point of the gas density relay body is electrically connected with a circuit between the first silicon controlled rectifier and the third silicon controlled rectifier through a circuit, and the other end of the contact point is electrically connected with a circuit between the second silicon controlled rectifier and the fourth silicon controlled rectifier through a circuit.

More preferably, the cathode of the first silicon controlled rectifier is connected with the intelligent control unit, and the anode of the first silicon controlled rectifier is connected with the cathode of the third silicon controlled rectifier; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the intelligent control unit; the cathode of the second silicon controlled rectifier is connected with the intelligent control unit, and the anode of the second silicon controlled rectifier is connected with the cathode of the fourth silicon controlled rectifier; and the control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the intelligent control unit.

Preferably, the gas density relay body includes, but is not limited to, a bi-metal strip compensated gas density relay, a gas compensated gas density relay, a bi-metal strip and a gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; a gas density relay with pointer display, a digital display type gas density relay, and a gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.

Preferably, the gas density detection sensor is provided on the gas density relay body; or the temperature regulating mechanism is arranged in the gas density relay body or outside the gas density relay body; or alternatively

The gas density detection sensor, the on-line check joint signal sampling unit and the intelligent control unit are arranged on the gas density relay body.

More preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are remote transmission type gas density relays with integrated structures.

Preferably, the gas density detection sensor is an integrated structure; or the gas density detection sensor is a gas density transmitter with an integrated structure.

More preferably, the on-line check joint signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

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

A gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or alternatively

A density detection sensor using quartz tuning fork technology.

More preferably, the pressure sensor is mounted on the gas path of the gas density relay body.

More preferably, the temperature sensor is mounted on or outside the gas path of the gas density relay body, or inside or outside the gas density relay body.

More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor; both contact and non-contact; can be a thermal resistor and a thermocouple; can be digital or analog.

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

Further, the pressure sensor can be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil of a Bardon tube), a resistance pressure sensor (such as a pressure sensor with a slide wire resistance of the Bardon tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.

More preferably, at least one of said temperature sensors is arranged near or on or integrated in a temperature compensation element of said gas density relay. Preferably, at least one of the temperature sensors is disposed at an end of the pressure detector of the gas density relay near the temperature compensation element; the pressure detector is a Bardon tube or a corrugated tube, and the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.

Preferably, the on-line check contact signal sampling unit and the intelligent control unit are arranged together.

More preferably, the on-line check contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

Preferably, the temperature regulating mechanism is a heating element; or the temperature regulating mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; or the temperature regulating mechanism comprises a heating element and a temperature controller; or the temperature regulating mechanism comprises a heating element, a heating power regulator and a temperature controller; or the temperature regulating mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature regulating mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature regulating mechanism comprises a heating element, a temperature controller and a temperature detector; or the temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or the temperature regulating mechanism is a miniature incubator; wherein the number of the heating elements is at least one, and the heating elements comprise, but are not limited to, one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises, but is not limited to, one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.

Preferably, the on-line sampling check gas density relay or the gas density monitoring device further comprises: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is also connected with the intelligent control unit, and the pressure of the gas density relay body is regulated to rise and fall under the control of the intelligent control unit, so that the gas density relay body generates contact signal action by being matched with or/and combined with the temperature regulating mechanism; or the gas density relay or the gas density monitoring device further comprises: the intelligent control unit is connected with the heating device; or the gas density relay or the gas density monitoring device further comprises a gas chamber and a heating device, the gas chamber is communicated with the gas density relay body, the heating device is arranged outside or inside the gas chamber, and the intelligent control unit is connected with the heating device.

The intelligent control unit is connected with the pressure regulating mechanism to complete the control of the pressure regulating mechanism.

Preferably, the pressure regulating mechanism is sealed within a cavity or housing.

Preferably, in the verification, the pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature change of the gas in the closed air chamber is caused by heating the heating element and/or refrigerating the heating element, so that the pressure rise and fall of the gas density relay are completed.

More preferably, the heating element, and/or the cooling element is a semiconductor.

More preferably, the pressure regulating mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the closed air chamber.

Preferably, in the verification process, the pressure regulating mechanism is a cavity with one end open, and the other end of the cavity is communicated with the gas path of the gas density relay body; the cavity is internally provided with a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod to drive the piston to move in the cavity.

Preferably, in the verification process, the pressure regulating mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving component is arranged outside the closed air chamber, and the driving component pushes the piston to move in the cavity through electromagnetic force.

Preferably, the pressure regulating mechanism is an air bag with one end connected with the driving component, the air bag is subjected to volume change under the driving of the driving component, and the air bag is communicated with the gas density relay body.

Preferably, the pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the drive of the driving component.

The driving component in the pressure regulating mechanism includes, but is not limited to, one of magnetic force, motor (variable frequency motor or stepping motor), reciprocating mechanism, carnot circulation mechanism, and pneumatic element.

More preferably, the temperature rise and fall mode of the temperature adjustment mechanism is multipole control.

Preferably, the pressure regulating mechanism is a bleed valve.

More preferably, the pressure regulating mechanism further comprises a flow valve controlling the flow rate of the gas release.

More preferably, the bleed valve is a solenoid valve or an electrically operated valve, or other bleed valve implemented by electrical or pneumatic means.

Preferably, the pressure regulating mechanism is a compressor.

Preferably, the pressure regulating mechanism is a pump.

More preferably, the pump includes, but is not limited to, one of a pumping pump, a booster pump, an electric air pump, an electromagnetic air pump.

Preferably, the on-line sampling check gas density relay or the gas density monitoring device further comprises: and one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the pressure regulating mechanism and the gas density relay body.

More preferably, the valve is further connected to the intelligent control unit, and the closing or opening of the valve is realized under the control of the intelligent control unit.

Preferably, the valve is an electrically operated valve.

Preferably, the valve is a solenoid valve.

More preferably, the valve is a permanent magnet solenoid valve.

Preferably, the valve is a piezoelectric valve, a temperature-controlled valve or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.

Preferably, the valve is closed or opened by bending or flattening the hose.

Preferably, the valve is sealed within a cavity or housing.

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

Preferably, pressure sensors are respectively arranged on two sides of the gas path of the valve.

Preferably, the electrical device comprises an SF6 gas electrical device, an SF6 mixed gas electrical device, an environmental protection gas electrical device, or other insulating gas electrical device.

Specifically, the electrical equipment comprises GIS, GIL, PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an air charging cabinet and a ring main unit.

Preferably, the valve communicates with the electrical device through an electrical device connection.

Preferably, the on-line checking contact signal sampling unit samples the contact signal of the gas density relay body to satisfy:

The on-line checking contact signal sampling unit is provided with at least two independent groups of sampling contacts, can automatically complete checking on at least two contacts at the same time, and continuously measures without replacing or reselecting the contacts; wherein the contacts include, but are not limited to, one of an alarm contact, an alarm contact + a latch 1 contact + a latch 2 contact, an alarm contact + a latch contact + an overpressure contact.

Preferably, the on-line checking contact signal sampling unit applies a voltage of not less than 24V to the contact signal action value or the switching value of the gas density relay body, that is, when checking, a voltage of not less than 24V is applied between the corresponding terminals of the contact signal.

Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor to complete the on-line monitoring of the gas density relay.

More preferably, the intelligent control unit calculates the gas density value by using a mean method (average method), the mean method being: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or in a set time interval and a set temperature interval step length, carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain gas density values; or in a set time interval, setting a pressure interval step length, and carrying out average value calculation on density values corresponding to N different pressure values acquired in all pressure change ranges to obtain gas density values; wherein N is a positive integer greater than or equal to 1.

Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched; or alternatively

The intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, and converts the pressure value and the temperature value into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, a gas density value, so as to finish the online verification of the gas density relay.

Preferably, the gas density relay body is provided with a comparison density value output signal, and the comparison density value output signal is connected with the intelligent control unit; or alternatively

The gas density relay body is provided with a comparison pressure value output signal which is connected with the intelligent control unit.

Preferably, the intelligent control unit is based on an embedded algorithm and a control program of the embedded system of the microprocessor, and automatically controls the whole verification process, including all peripherals, logic and input and output.

More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general purpose computer, an industrial personal computer, an ARM chip, an AI chip, CPU, MCU, FPGA, PLC and the like, an industrial control main board, an embedded main control board and the like, and comprises all peripherals, logic and input and output.

Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.

More preferably, the gas density relay (or gas density monitoring device) supports the input of basic information of the gas density relay, including, but not limited to, one or more of a factory number, a precision requirement, a nominal parameter, a manufacturing plant, an operating location.

Preferably, the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results.

More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.

Further, the wired communication mode includes, but is not limited to, one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier and a cable.

Further, the wireless communication mode includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, and sonar.

Preferably, the intelligent control unit is further provided with a clock, and the clock is configured to periodically set the verification time of the gas density relay or record the test time.

Preferably, the control of the intelligent control unit is controlled by on-site control and/or by background control.

More preferably, the on-line sampling and checking gas density relay with the protection function completes on-line checking of the gas density relay according to the setting or the instruction of the background; or alternatively

And according to the set verification time of the gas density relay, completing the on-line verification of the gas density relay.

Preferably, the on-line sampling and checking gas density relay with the protection function further comprises a multi-way joint, and the gas density relay body, the valve and the pressure regulating mechanism are arranged on the multi-way joint.

More preferably, the gas path of the gas density relay body is connected with the first joint of the multi-way joint;

The gas circuit of the pressure regulating mechanism is connected with the second joint of the multi-way joint, and the first joint is communicated with the second joint, so that the gas circuit of the pressure regulating mechanism is communicated with the gas density relay body; the other end of the valve communicates with a third joint of the multi-way joint, which communicates with the first joint, thereby communicating the other end of the valve with the pressure regulating mechanism, and/or the gas density relay body.

Preferably, the gas density relay body, the valve, and the pressure adjustment mechanism are connected together by a connecting pipe.

Preferably, the on-line sampling check gas density relay with a protection function further comprises a self-sealing valve, wherein the self-sealing valve is arranged between the electrical equipment and the valve; or the valve is mounted between the electrical device and the self-sealing valve.

Preferably, the on-line sampling check gas density relay with the protection function further comprises a gas supplementing interface.

More preferably, the air supplementing interface is arranged on the pressure regulating mechanism; or the air supplementing interface is arranged on the electrical equipment; or the air supplementing interface is arranged on the multi-way joint; or the air supplementing interface is arranged on the self-sealing valve.

Preferably, the on-line sampling check gas density relay with protection function further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, and displays current check data in real time or/and supports data input.

Preferably, the on-line sampling check gas density relay with protection function further comprises: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.

More preferably, the on-line sampling check gas density relay with protection function further comprises: the gas circulation mechanism is respectively connected with the gas density relay body and the intelligent control unit and comprises a capillary tube, a sealing cavity and a heating element.

Further, the micro water sensor can be installed in a sealed chamber, a capillary tube, a capillary orifice and outside the capillary tube of the gas circulation mechanism.

Preferably, the on-line sampling check gas density relay with protection function further comprises: and the decomposition product sensor is respectively connected with the gas density relay body and the intelligent control unit.

Preferably, the on-line sampling check gas density relay with the protection function further comprises a camera for monitoring.

Preferably, the gas density relay body or the monitoring device further comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator in the gas density relay body; under the control of the on-line checking contact signal sampling unit, the contact signal of the gas density relay is isolated from the control loop, and the contact resistance detection unit can detect the contact resistance value of the gas density relay when the contact signal of the gas density relay acts and/or when receiving an instruction for detecting the contact resistance.

Preferably, at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line checking joint signal sampling units, an intelligent control unit and a gas density detection sensor are arranged, so that on-line checking of the gas density relay is completed; or alternatively

The intelligent gas density relay comprises at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two intelligent control units and a gas density detecting sensor, so that on-line checking of the gas density relay is completed; or alternatively

The gas density relay comprises at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line checking joint signal sampling units, at least two gas density detection sensors and an intelligent control unit, and the on-line checking of the gas density relay is completed.

The third aspect of the application provides a method for checking a gas density relay, comprising the following steps:

in a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;

The gas density relay or the gas density monitoring device is used for checking the gas density relay under the condition that the gas density relay is allowed or/and can be checked according to the set checking time or/and checking command and the gas density value condition or/and the temperature value condition:

The temperature of the gas density relay is increased by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay is increased, the gas density relay is subjected to joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value during joint action, or the gas density value is directly obtained, the joint signal action value of the gas density relay is detected, and the checking work of the joint signal action value of the gas density relay is completed;

after all the contact signal checking work is completed, the intelligent control unit turns off the heating element of the temperature regulating mechanism.

Preferably, a method for verifying a gas density relay includes:

In a normal working state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;

The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay, and the contact of the gas density relay body is connected to the intelligent control unit;

The temperature of the gas density relay is reduced by controlling the temperature regulating mechanism through the intelligent control unit, so that the temperature of the temperature compensating element of the gas density relay is reduced, the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit directly obtains the gas density value according to the pressure value and the temperature value when the contact is reset, or the gas density value is directly obtained, the contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is completed;

After all the contact signal checking work is completed, the intelligent control unit turns off the heating element of the temperature regulating mechanism, and adjusts the on-line checking contact signal sampling unit to a working state, and the control loop of the contact signal of the gas density relay resumes to operate in a normal working state.

Preferably, the gas density relay or the monitoring device further comprises a valve and a pressure regulating mechanism, wherein a gas path of the pressure regulating mechanism is communicated with a gas path of the gas density relay body, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay body; a method of calibrating a gas density relay, comprising:

In a normal working state, the gas density relay monitors a gas density value in the electrical equipment;

Closing the valve by an intelligent control unit;

The intelligent control unit drives the pressure regulating mechanism to slowly reduce the pressure of the gas, and the intelligent control unit controls the temperature regulating mechanism to increase the temperature of the gas density relay, so that the temperature of a temperature compensating element of the gas density relay is increased, the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit through an on-line checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;

After all the contact signal checking work is completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the heating element of the temperature regulating mechanism.

Closing the valve by an intelligent control unit;

The intelligent control unit is used for controlling the temperature regulating mechanism to enable the temperature of the gas density relay to rise, further enabling the temperature of a temperature compensating element of the gas density relay to rise, driving the pressure regulating mechanism through the intelligent control unit to enable the gas pressure to slowly drop, enabling the gas density relay to generate contact action, enabling the contact action to be transmitted to the intelligent control unit through an on-line checking contact signal sampling unit, enabling the intelligent control unit to obtain a gas density value according to a pressure value and a temperature value during the contact action, or directly obtaining the gas density value, detecting a contact signal action value of the gas density relay, and completing checking work of the contact signal action value of the gas density relay;

The temperature of the gas density relay is reduced by controlling the temperature regulating mechanism through the intelligent control unit, the temperature of the temperature compensating element of the gas density relay is reduced, the pressure regulating mechanism is driven by the intelligent control unit to slowly increase the gas pressure, so that the gas density relay is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is completed;

After all the contact signal checking work is completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the heating element of the temperature regulating mechanism, and adjusts the on-line checking contact signal sampling unit to a working state, and the control loop of the contact signal of the gas density relay resumes to operate in a normal working state.

Preferably, the gas density relay or monitoring device further comprises a valve, a gas chamber and a heating device, wherein the gas chamber is communicated with the gas density relay body, the heating device is arranged outside or inside the gas chamber, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with a gas path of the gas density relay body; the method comprises the following steps:

heating the heating device through the intelligent control unit to cause the temperature change of the gas in the gas chamber, closing the valve through the intelligent control unit after the temperature change reaches a set value, and then turning off the heating device through the intelligent control unit;

After the temperature or pressure of the air chamber is reduced to a proper value, the temperature of the gas density relay is increased by controlling the temperature regulating mechanism through the intelligent control unit, and then the temperature of the temperature compensating element of the density relay is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit through the on-line checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value when the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;

After all the contact signal checking works are completed, the intelligent control unit opens the valve, and the intelligent control unit turns off the temperature regulating mechanism.

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

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or a density detection sensor using quartz tuning fork technology.

Preferably, after the gas density relay completes verification, if an abnormality exists, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.

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

Preferably, the verification method further comprises: the intelligent control unit is controlled by field control and/or by background control.

More preferably, in the verification method, at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line verification contact signal sampling units, an intelligent control unit and a gas density detection sensor complete on-line verification of the gas density relay; or at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two intelligent control units and a gas density detection sensor, so as to complete on-line checking of the gas density relay; or alternatively

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

The application provides an online sampling and checking gas density relay with a protection function and a checking method thereof, which are used for high-voltage electrical equipment. The on-line checking contact signal sampling unit is relatively isolated from a contact signal of the gas density relay body in a circuit in a non-checking state; when in a verification state, the contact signal control loop is cut off, so that contact action signals of the gas density relay body are not uploaded, safe operation of a power grid is not affected, meanwhile, the contacts of the gas density relay body are connected with the intelligent control unit, the state of the contacts of the gas density relay body is monitored, and safety of the intelligent control unit during verification is guaranteed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic diagram of a control circuit of a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of another control circuit of the preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of another control circuit of the preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of another control circuit of the preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of another control circuit of the preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of another control circuit of the preferred embodiment of the present invention;

fig. 7 is a schematic diagram of another control circuit according to a preferred embodiment of the present invention.

Detailed Description

The invention provides an on-line sampling and checking gas density relay with a protection function and a checking method thereof, and aims to make the purposes, the technical scheme and the effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Embodiment one:

Fig. 1 is a schematic diagram of a control circuit of an on-line sampling check gas density relay with protection function for a high-voltage electrical apparatus according to an embodiment of the present invention. As shown in fig. 1, an on-line sampling check gas density relay with protection function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature regulating mechanism 5, an on-line check joint signal sampling unit 6, an intelligent control unit 7 and a pressure regulating mechanism 8. One end of the valve 4 is provided with an interface communicated with electrical equipment, and the other end of the valve 4 is communicated with the gas density relay body 1; the temperature regulating mechanism 5 is arranged opposite to the gas density relay 1, and the temperature sensor 3 is arranged in the shell of the density relay 1. Specifically, the temperature adjustment mechanism 5 is provided outside the density relay body 1 (or the temperature adjustment mechanism 5 is provided inside the housing of the gas density relay body 1). The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body 1, so that the gas density relay body 1 generates a contact action; the gas path of the pressure regulating mechanism 8 is communicated with the gas density relay body 1; the pressure regulating mechanism 8 is configured to regulate the pressure rise and fall of the gas density relay body 1, and then is matched with or/and combined with the temperature regulating mechanism 5 to enable the gas density relay body 1 to generate contact action; the on-line checking contact signal sampling unit 6 is respectively connected with the gas density relay body 1 and the intelligent control unit 7; the intelligent control unit 7 is further connected with the pressure sensor 2, the temperature sensor 3, the temperature adjusting mechanism 5, the pressure adjusting mechanism 8, the valve 4 and the on-line checking joint signal sampling unit 6 respectively, and is configured to control the valve 4 to be closed or opened, complete the control of the temperature adjusting mechanism 5, complete the control of the pressure adjusting mechanism 8, the collection of pressure values and temperature values, and/or the collection of gas density values, and detect the joint signal action value and/or the joint signal return value of the gas density relay body 1. Wherein the contact signal includes an alarm, and/or a latch.

The on-line checking joint signal sampling unit 6 is provided with a protection circuit, and the protection circuit comprises a first relay J1 and a second relay J2. The first relay J1 is provided with normally closed joints J11 and J12, and the normally closed joints J11 and J12 are connected in series in the joint signal control loop; the second relay J2 is provided with normally open joints J21 and J22, and the normally open joints J21 and J22 are connected to a joint P _J of the gas density relay body 1; the first relay J1 and the second relay J2 may be integrated, that is, a relay having normally open and normally closed contacts. In a non-verification state, the contact P _J is a normally-open type density relay, the normally-closed contacts J11 and J12 are closed, the normally-open contacts J21 and J22 are opened, and the gas density relay monitors the output state of the contact P _J in real time; in the verification state, the normally closed junctions J11 and J12 are opened, the normally open junctions J21 and J22 are closed, and the junction P _J of the gas density relay body 1 is connected with the intelligent control unit 7 through the normally open junctions J21 and J22.

The intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) may be a general purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, MCU, FPGA, PLC, etc., an industrial motherboard, an embedded main control board, etc., and other intelligent integrated circuits. The power source 72 (U2) may be a switching power supply, an ac 220V, a dc power supply, an LDO, a programmable power supply, solar power, a secondary battery, a rechargeable battery, a battery, or the like.

Furthermore, the pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and other pressure sensing elements. The temperature sensor 3 for temperature acquisition T may be: temperature sensor, temperature transmitter, etc. The valve 4 may be: solenoid valves, electrically operated valves, pneumatic valves, ball valves, needle valves, regulating valves, shutters, etc. can open and close the air path, even the flow control elements. Semi-automatic may also be a manual valve. The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature regulating mechanism mainly comprises a heating element and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a heating power regulator and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature regulating mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or the temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or the temperature regulating mechanism is a miniature incubator; wherein the heating element comprises, but is not limited to, one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the number of the heating elements is at least one; the controller includes, but is not limited to, one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller, and a PLC controller. The pressure regulating mechanism 8 may be: an electric regulating piston, an electric regulating cylinder, a booster pump, a gas cylinder for pressurization, a valve, an electromagnetic valve, a flow controller and the like. The pressure adjustment mechanism may also be semi-automatic or manually adjustable.

Working principle:

The intelligent control unit 7 monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P ₂₀ (namely a gas density value). When the gas density relay body 1 needs to be checked, if the gas density value P ₂₀ is more than or equal to the set safety check density value P _S, the intelligent control unit 7 controls the valve 4 to be closed, so that the gas density relay body 1 is isolated from electrical equipment on a gas path.

Then, the intelligent control unit 7 controls to disconnect the contact signal control loop of the gas density relay body 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the on-line checking contact signal sampling unit 6 are disconnected, so that the safety operation of the electrical equipment is not affected when the gas density relay body 1 is checked on line, and an alarm signal is not sent out by mistake or the control loop is locked when the gas density relay body 1 is checked on line. Because the monitoring and judgment of the safety check density value P _S set at or above the gas density value P ₂₀ is already performed before the start of the check, the gas leakage of the electrical equipment is a slow process within the safety operation range, and the check is safe. Meanwhile, the contact sampling circuit of the contact of the gas density relay body 1 is communicated through the intelligent control unit 7, namely normally open contacts J21 and J22 of a second relay J2 of the online checking contact signal sampling unit 6 are closed, and at the moment, a contact P _J of the gas density relay body 1 is connected with the intelligent control unit 7 through the normally open contacts J21 and J22 of the second relay J2.

Then, the intelligent control unit 7 controls the driving part 52 (which may be mainly implemented by a motor and a gear, and has various and flexible modes) of the pressure adjusting mechanism 8, so as to adjust the volume change of the pressure adjusting mechanism 8, gradually reduce the pressure of the gas density relay body 1, and stop the operation after the pressure is reduced to the target pressure value. Then, the temperature of the gas density relay body 1 is increased by the operation or control of the temperature adjusting mechanism 5 by the intelligent control unit 7, and the temperature of the temperature compensating element of the gas density relay body 1 is increased, so that the gas density relay body 1 generates a contact action, the contact action is uploaded to the intelligent control unit 7 by the second relay J2 of the on-line checking contact signal sampling unit 6, and the intelligent control unit 7 converts the pressure value P and the temperature T measured during the contact action into a pressure value P ₂₀ (density value) corresponding to 20 ℃ according to the gas characteristic, so that the contact action value P _D20 of the gas density relay can be detected. After the contact signal action values of the alarm and/or locking signals of the gas density relay body 1 are all detected, the temperature of the gas density relay body 1 is reduced by the operation or control of the temperature regulating mechanism 5 through the intelligent control unit 7, and then the temperature of the temperature compensating element of the density relay is reduced, so that contact reset of the gas density relay occurs, the contact reset is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 obtains the gas density value according to the pressure value and the temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is completed. Or the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 8, and regulates the pressure regulating mechanism 8 to gradually increase the pressure of the gas density relay body 1, so as to test the return value of the alarm and/or locking contact signals of the gas density relay body 1. In short, 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 is completed.

After the verification is completed, the normally open contacts J21 and J22 of the second relay J2 of the on-line verification contact signal sampling unit 6 are disconnected, and at this time, the contact P _J of the gas density relay body 1 is disconnected from the intelligent control unit 7 by disconnecting the normally open contacts J21 and J22 of the second relay J2. The heating element of the temperature regulating mechanism 5 is turned off through the intelligent control unit 7, and the intelligent control unit 7 controls the valve 4 to be opened, so that the gas density relay body 1 is communicated with electrical equipment on a gas path. Then, normally closed contacts J11 and J12 of a first relay J1 of the on-line checking contact signal sampling unit 6 are closed, a contact signal control loop of the gas density relay body 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Thus, the on-line checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.

Embodiment two:

As shown in fig. 2, the on-line checking contact signal sampling unit 6 is provided with a contact sampling circuit. In this embodiment, the contact sampling circuit includes a photo coupler OC1 and a resistor R1, where the photo coupler OC1 includes a light emitting diode and a phototransistor; the anode of the light emitting diode and the contact P _J of the gas density relay body 1 are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is used as an output end out6 of the on-line check joint signal sampling unit 6 to be connected with the intelligent control unit 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.

By the contact sampling circuit, whether the contact P _J of the gas density relay body 1 is opened or closed can be conveniently known. Specifically, when the contact P _J is closed, the closed loop is electrified, the light emitting diode emits light, the light turns on the phototransistor, and the collector electrode of the phototransistor outputs a low level; when the contact P _J is opened, the closed loop is opened, the light emitting diode does not emit light, the phototransistor is turned off, and the collector of the phototransistor outputs a high level. In this way, the high-low level is output through the output terminal out6 of the on-line check contact signal sampling unit 6.

In this embodiment, the intelligent control unit 7 is isolated from the contact signal control circuit by a photoelectric isolation method, and the contact P _J is closed in the verification process, or the contact P _J is closed under the condition of air leakage, and at this time, the low level of the collector output of the phototransistor is detected. The time for closing the contact P _J during the verification process is controlled to be a preset length, so that the length of the duration of the closing state of the contact P _J during the verification process is determined under the condition of no air leakage, and whether the contact P _J is closed during the verification process can be judged by monitoring the duration of the received low level. Therefore, the time can be recorded during verification, and the gas density relay body 1 can judge that the alarm signal during verification is sent out instead of the alarm signal during gas leakage.

In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2). In this embodiment, the verification of the gas density relay is achieved only by the temperature adjusting mechanism 5.

Embodiment III:

As shown in fig. 3, the on-line checking contact signal sampling unit 6 is provided with a contact sampling circuit, and in this embodiment, the contact sampling circuit includes a first photo-coupler OC1 and a second photo-coupler OC2.

The light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of the second photoelectric coupler OC2 are respectively connected in parallel through current limiting resistors, and are connected in series with the contact of the gas density relay body to form a closed loop after being connected in parallel, and the connection directions of the light emitting diodes of the first photoelectric coupler OC1 and the light emitting diodes of the second photoelectric coupler OC2 are opposite; the collector of the phototriode of the first photoelectric coupler OC1 and the collector of the phototriode of the second photoelectric coupler OC2 are connected with a power supply through a voltage dividing resistor, the emitter of the phototriode of the first photoelectric coupler OC1 is connected with the emitter of the phototriode of the second photoelectric coupler OC2 to form an output end out6, and the output end out6 is connected with the intelligent control unit 7 and grounded through a resistor R5.

By the contact sampling circuit, whether the contact P _J of the gas density relay body 1 is opened or closed can be conveniently known. Specifically, when the contact P _J is closed, the closed loop is electrified, the first photo coupler OC1 is turned on, the second photo coupler OC2 is turned off, and the emitter (i.e., the output end out 6) of the phototransistor of the first photo coupler OC1 outputs a high level; or the first photo-coupler OC1 is turned off, the second photo-coupler OC2 is turned on, and the emitter (i.e., the output terminal out 6) of the phototransistor of the second photo-coupler OC2 outputs a high level. When the contact P _J is opened, the closed loop is disconnected, the first and second photo-couplers OC1 and OC2 are turned off, and the emitters (i.e., the output terminal out 6) of the phototransistors of the first and second photo-couplers OC1 and OC2 output a low level.

In a preferred embodiment, the contact sampling circuit further includes a first zener diode group and a second zener diode group, the first zener diode group and the second zener diode group are connected in parallel to the contact signal control loop, and the connection directions of the first zener diode group and the second zener diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.

In this embodiment, the first zener diode group includes a first zener diode D1 and a second zener diode D2 connected in series, and a cathode of the first zener diode D1 is connected to an anode of the second zener diode D2; the second zener diode group comprises a third zener diode D3 and a fourth zener diode D4 which are connected in series, and the positive electrode of the third zener diode D3 is connected with the negative electrode of the fourth zener diode D4.

The contact sampling circuit can conveniently monitor the state of the contact P _J of the gas density relay body 1, and is combined with the intelligent control unit 7 to correspondingly process whether the contact P _J is in an open state or a closed state and carry out remote transmission, so that the state of a contact signal is known from the background, and the reliability of a power grid is greatly improved.

In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1) and a power supply 72 (U2).

Embodiment four:

As shown in fig. 4, the present embodiment differs from the third embodiment in that: the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display 75 (U5), a data storage 76 (U6) and the like.

The communication mode of the communication module 73 (U3) may be wired, such as an industrial BUS including RS232, RS485, CAN-BUS, etc., an optical fiber ethernet, 4-20mA, hart, IIC, SPI, wire, a coaxial cable, a PLC power carrier, etc.; or wireless, such as 2G/3G/4G/5G, etc., WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, sonar, etc. The intelligent control unit protection circuit 74 (U4) may be an anti-static interference circuit (e.g., ESD, EMI), an anti-surge circuit, an electrical fast protection circuit, an anti-rf field interference circuit, an anti-burst interference circuit, a power short protection circuit, a power reverse protection circuit, an electrical contact misconnection protection circuit, a charging protection circuit, etc. The intelligent control unit protection circuits can be one kind or a plurality of kinds of flexible combination. The display and output 75 (U5) may be a nixie tube, LED, LCD, HMI, a display, a matrix screen, a printer, a facsimile, a projector, a mobile phone, etc., and may be one kind or a combination of several kinds. The data storage 76 (U6) may be a flash memory card such as FLASH, RAM, ROM, a hard disk, SD, etc., a magnetic tape, a punched paper tape, an optical disk, a usb disk, a optical disk, a film, etc., and may be one kind or a combination of several kinds.

Fifth embodiment:

As shown in fig. 5, the on-line checking contact signal sampling unit 6 is provided with a contact sampling circuit, in this embodiment, the contact sampling circuit includes a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2 and a contact P _J of the gas density relay body are connected in series to form a closed loop, and a contact P _J of the gas density relay body 1 is connected between the first hall current sensor H1 and the second hall current sensor H2; the output end of the first Hall current sensor H1 and the output end of the second Hall current sensor H2 are connected with the intelligent control unit 7.

By the contact sampling circuit, whether the contact P _J of the gas density relay body 1 is opened or closed can be conveniently known. Specifically, when the contact P _J is closed, a closed loop is electrified, and a current flows between the first hall current-sensor H1 and the second hall current-sensor H2, so as to generate an induced potential; when the contact P _J is opened, the closed loop is powered off, no current flows between the first hall current-sensor H1 and the second hall current-sensor H2, and the induced potential generated is zero.

In this embodiment, the intelligent control unit 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent control unit protection circuit 74 (U4), a display and output 75 (U5), a data storage 76 (U6), and the like.

Example six:

As shown in fig. 6, the on-line checking contact signal sampling unit 6 is provided with a contact sampling circuit, and in this embodiment, the contact sampling circuit includes: the first silicon controlled rectifier SCR1, the second silicon controlled rectifier SCR2, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4.

The first silicon controlled rectifier SCR1 is connected with the third silicon controlled rectifier SCR3 in series, and the second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 are connected in series and then form a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR 3; one end of the contact P _J of the gas density relay body 1 is electrically connected with the circuit between the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR3 through a circuit, and the other end of the contact P _J is electrically connected with the circuit between the second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 through a circuit. The series-parallel connection is a circuit in which the above-described components are connected in parallel and in series, as shown in fig. 6.

Specifically, the anode of the first silicon controlled rectifier SCR1 and the cathode of the second silicon controlled rectifier SCR2 are connected to form the output end of the on-line checking contact signal sampling unit 6, which is connected with the intelligent control unit 7; the cathode of the first silicon controlled rectifier SCR1 is connected with the cathode of the third silicon controlled rectifier SCR 3; the anode of the second silicon controlled rectifier SCR2 is connected with the anode of the fourth silicon controlled rectifier SCR 4; the anode of the third silicon controlled rectifier SCR3 and the cathode of the fourth silicon controlled rectifier SCR4 are connected with the input end of the on-line check joint signal sampling unit 6. The control electrodes of the first silicon controlled rectifier SCR1, the second silicon controlled rectifier SCR2, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are all connected with the intelligent control unit 7. The intelligent control unit 7 can control the on or off of the corresponding silicon controlled rectifier.

The working procedure of this embodiment is as follows:

When the verification is not performed and the normal operation is performed, the contact P _J is disconnected, the contact sampling circuit triggers the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are in a conducting state, and the contact signal control loop is in a working state. At this time, the contact sampling circuit does not trigger the first silicon controlled rectifier SCR13 and the second silicon controlled rectifier SCR2, and the cathodes of the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 have no voltage output and are in an off state.

When checking, the contact sampling circuit does not trigger the third SCR3 and the fourth SCR4, but triggers the first SCR1 and the second SCR2. At this time, the third SCR3 and the fourth SCR4 are in the off state, and the contact P _J is isolated from the contact signal control loop. The first SCR1 and the second SCR2 are in a conductive state, and the contact P _J is connected with the on-line verification contact signal sampling unit 6 and connected with the intelligent control unit 7.

The on-line checking contact signal sampling unit 6 can also be formed by mixing a solid-state relay or an electromagnetic relay and a silicon controlled rectifier flexibly.

Embodiment seven:

As shown in fig. 7, the present embodiment differs from the first embodiment in that: a normally open junction J13 is added between the normally closed junctions J11 and J12. In the non-verification state, the contact P _J is a normally-closed type density relay, the normally-closed contacts J11 and J12 are closed, the J13 is opened, and the normally-open contacts J21 and J22 are opened; in the verification state, the J13 of the on-line verification contact signal sampling unit closes the contact signal control loop, and the normally closed contacts J11 and J12 are opened, that is, the connection between the contact P _J of the gas density relay body 1 and the contact signal control loop is cut off, and the normally open contacts J21 and J22 are closed and are communicated with the second connection circuit, so that the contact P _J of the gas density relay body 1 is connected with the intelligent control unit 7.

The on-line sampling check gas density relay with the protection function can have different error judgment requirements when checking the density relay contacts at high temperature, low temperature, normal temperature and 20 ℃ ambient temperature, and can be implemented according to the temperature requirements and the related standards; the comparison of the error performance of the density relay can be performed at different temperatures and for different time periods. I.e., at different times, in the same temperature range, a determination is made as to the performance of the density relay. The comparison of each period of the history and the comparison of the history and the current. Physical examination can also be performed on the density relay body. When necessary, the density relay contact signals can be checked at any time; a determination is made as to whether the density value of the monitored electrical device is normal or not with the gas density relay body. The density value, the gas density relay body, the pressure sensor and the temperature sensor of the electrical equipment can be judged, analyzed and compared normally and abnormally, so that the states of the electrical equipment such as gas density monitoring, the density relay body and the like are judged, compared and analyzed; the contact signal state of the gas density relay is also monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the device is opened or closed, so that one layer of monitoring is added, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; the insulating property of the gas density relay body is also detected, or detected and judged.

The gas density relay with the protection function in the on-line sampling and checking method can be a gas density relay with integral components, or a gas density relay with integral components, and can be generally called a gas density monitoring device.

In summary, the on-line sampling and checking gas density relay with the protection function and the checking method thereof provided by the application are used for high-voltage electrical equipment and comprise a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, a pressure adjusting mechanism, a valve, an on-line checking contact signal sampling unit and an intelligent control unit. The on-line checking contact signal sampling unit is provided with a protection circuit, and in a non-checking state, the contact signals of the on-line checking contact signal sampling unit and the gas density relay body are ensured to be relatively isolated on the circuit; when in a verification state, the on-line verification contact signal sampling unit can cut off a contact signal control loop, so that contact action signals of the gas density relay body are prevented from uploading, safe operation of a power grid is prevented from being influenced, meanwhile, the contacts of the gas density relay body are connected with the intelligent control unit through the contact sampling circuit, the state of the contacts of the gas density relay body is monitored, and safety of the intelligent control unit during verification is ensured. In addition, for SF6 gas, the specific conversion method of SF6 gas pressure-temperature characteristics can be calculated according to Betty-Bridgman equation; for SF6 mixed gas, the specific conversion method of the pressure-temperature characteristics of the SF6 mixed gas can be calculated according to the Dalton partial pressure law, betty-Bridgman equation and ideal gas state equation. The temperature regulating mechanism is arranged in or outside the shell of the gas density relay and is arranged on the shell. The temperature sensor may be digital or analog; either contact or non-contact. Pt100, DS18B20 temperature sensors, etc. may be employed.

The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.

Claims

1. On-line sampling check gas density relay with protect function, its characterized in that includes: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, an on-line check joint signal sampling unit and an intelligent control unit;

the temperature regulating mechanism is a temperature-adjustable regulating mechanism and is arranged in or outside the gas density relay body, and the temperature regulating mechanism is configured to regulate the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal actions;

Wherein the contact signal includes an alarm, and/or a latch.

2. The on-line sampling check gas density relay of claim 1, wherein: the first connecting circuit comprises a first relay, the second connecting circuit comprises a second relay, the first relay is provided with at least one normally-closed contact, the second relay is provided with at least one normally-open contact, and the normally-closed contact and the normally-open contact keep opposite switch states; the normally-closed contact is connected in series in the contact signal control loop, and the normally-open contact is connected to the contact of the gas density relay body;

3. The on-line sampling check gas density relay of claim 2, wherein: the first relay and the second relay are two independent relays or the same relay.

4. The on-line sampling check gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a photoelectric coupler and a resistor, and the photoelectric coupler comprises a light emitting diode and a phototriode; the contact points of the light emitting diode and the gas density relay body are connected in series to form a closed loop; the emitter of the phototriode is grounded; the collector of the phototriode is connected with the intelligent control unit, and the collector of the phototriode is also connected with a power supply through the resistor;

5. The on-line sampling check gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit comprises a first photoelectric coupler and a second photoelectric coupler;

6. The on-line sampling check gas density relay of claim 5, wherein: the contact sampling circuit further comprises a first voltage-stabilizing diode group and a second voltage-stabilizing diode group, wherein the first voltage-stabilizing diode group and the second voltage-stabilizing diode group are connected in parallel on the contact signal control loop, and the connection directions of the first voltage-stabilizing diode group and the second voltage-stabilizing diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are formed by connecting one, two or more voltage stabilizing diodes in series.

7. The on-line sampling check gas density relay of claim 6, wherein: the first voltage stabilizing diode group comprises a first voltage stabilizing diode and a second voltage stabilizing diode which are connected in series, and the cathode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode; the second zener diode group comprises a third zener diode and a fourth zener diode which are connected in series, and the positive electrode of the third zener diode is connected with the negative electrode of the fourth zener diode.

8. The on-line sampling check gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit is provided with a contact sampling circuit, the contact sampling circuit comprises a first Hall current sensor and a second Hall current sensor, the contacts of the first Hall current sensor, the second Hall current sensor and the gas density relay body are connected in series to form a closed loop, and the contacts of the gas density relay body are connected between the first Hall current sensor and the second Hall current sensor; the output end of the first Hall current sensor and the output end of the second Hall current sensor are connected with the intelligent control unit;

9. The on-line sampling check gas density relay of claim 1, wherein: the on-line checking joint signal sampling unit is provided with a joint sampling circuit, and the joint sampling circuit comprises: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;

10. The on-line sampling check gas density relay of claim 9, wherein: the cathode of the first silicon controlled rectifier is connected with the intelligent control unit, and the anode of the first silicon controlled rectifier is connected with the cathode of the third silicon controlled rectifier; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the intelligent control unit; the cathode of the second silicon controlled rectifier is connected with the intelligent control unit, and the anode of the second silicon controlled rectifier is connected with the cathode of the fourth silicon controlled rectifier; and the control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the intelligent control unit.

11. The on-line sampling check gas density relay of claim 1, wherein: the gas density detection sensor is arranged on the gas density relay body; or alternatively

12. The on-line sampling check gas density relay of claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or alternatively

A density detection sensor using quartz tuning fork technology.

13. The on-line sampling check gas density relay of claim 12, wherein: the pressure sensor is arranged on the gas path of the gas density relay body; the temperature sensor is arranged on the gas path or outside the gas path of the gas density relay body, or near the temperature compensation element in the gas density relay body, or outside the gas density relay body.

14. The on-line sampling calibration gas density relay of claim 1, wherein,

The temperature regulating mechanism consists of a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; or alternatively

The temperature regulating mechanism consists of a heating element and a temperature controller; or alternatively

The temperature regulating mechanism consists of a heating element, a heating power regulator and a temperature controller; or alternatively

The temperature regulating mechanism consists of a heating element, a refrigerating element, a power regulator and a temperature controller; or alternatively

The temperature regulating mechanism consists of a heating element, a controller and a temperature detector; or alternatively

The temperature regulating mechanism is a heating element, and the heating element is arranged near the temperature compensating element; or alternatively

The temperature regulating mechanism is a miniature incubator;

The heating elements comprise at least one of a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor;

The temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and comprises one of a PID controller, a controller combining PID with fuzzy control, a variable frequency controller and a PLC controller.

15. The on-line sampling check gas density relay of claim 1, further comprising: and one end of the valve is provided with a connecting port communicated with the electrical equipment, and the other end of the valve is communicated with the gas density relay body.

16. The on-line sampling check gas density relay of claim 15, wherein: the valve is also connected with the intelligent control unit, and the valve is closed or opened under the control of the intelligent control unit.

17. The on-line sampling check gas density relay of claim 15, wherein: the valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature-controlled valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.

18. The on-line sampling check gas density relay of claim 1, further comprising: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is also connected with the intelligent control unit, and the pressure of the gas density relay body is regulated to rise and fall under the control of the intelligent control unit, so that the gas density relay body generates contact signal action by being matched with or/and combined with the temperature regulating mechanism; or alternatively

Further comprises: the intelligent control unit is connected with the heating device; or alternatively

The intelligent control device is characterized by further comprising an air chamber and a heating device, wherein the air chamber is communicated with the gas density relay body, the heating device is arranged outside or inside the air chamber, and the intelligent control unit is connected with the heating device.

19. The on-line sampling check gas density relay of claim 18, wherein: when in verification, the pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed due to the heating element heating and/or the refrigerating element refrigerating, so that the pressure rise and fall of the gas density relay are completed; or alternatively

The pressure regulating mechanism is a cavity with one end open, and the other end of the cavity is communicated with the gas path of the gas density relay body; the piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving component, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving component drives the adjusting rod to drive the piston to move in the cavity; or alternatively

The pressure regulating mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or alternatively

The pressure regulating mechanism is an air bag with one end connected with a driving component, the air bag is subjected to volume change under the driving of the driving component, and the air bag is communicated with the gas density relay body; or alternatively

The pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the drive of the driving part; or alternatively

The pressure regulating mechanism is a deflation valve, and the deflation valve is an electromagnetic valve or an electric valve or other deflation valves realized by an electric or gas mode; or alternatively

The pressure regulating mechanism is a compressor; or alternatively

The pressure regulating mechanism is a pump, and the pump comprises one of a pressure-making pump, a booster pump, an electric air pump and an electromagnetic air pump;

wherein the driving part comprises one of magnetic force, a motor, a reciprocating mechanism, a Carnot circulation mechanism and a pneumatic element.

20. The on-line sampling check gas density relay of claim 1, wherein: the intelligent control unit also comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

21. The on-line sampling check gas density relay of claim 1, wherein: the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.

22. The on-line sampling check gas density relay of claim 1, wherein: the intelligent control unit is controlled by field control and/or by background control.

23. The on-line sampling check gas density relay of claim 1, further comprising: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, and displays current check data in real time or/and supports data input.

24. The on-line sampling check gas density relay of claim 1, wherein: the gas density relay body further comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator in the gas density relay body; under the control of the on-line checking contact signal sampling unit, the contact signal of the gas density relay is isolated from the control loop, and the contact resistance detection unit can detect the contact resistance value of the gas density relay when the contact signal of the gas density relay acts and/or when receiving an instruction for detecting the contact resistance.

25. The on-line sampling check gas density relay of claim 1, wherein: the intelligent control system comprises at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, an intelligent control unit and a gas density detection sensor, and is used for completing on-line checking of the gas density relay; or alternatively

26. A gas density monitoring device with protect function, its characterized in that: the gas density monitoring device is composed of the on-line sampling check gas density relay with the protection function as claimed in any one of claims 1 to 25; or the gas density monitoring device comprises the online sampling check gas density relay with the protection function as claimed in any one of claims 1 to 25.

27. A method of calibrating a gas density relay according to claim 1, comprising:

the gas density relay is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition or/and the temperature value condition under the condition that the gas density relay is allowed to be checked:

28. The method of calibrating a gas density relay of claim 27, comprising:

In a normal working state, the gas density relay monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;

29. The method for calibrating a gas density relay according to claim 27, wherein the gas density relay further comprises a valve and a pressure regulating mechanism, wherein a gas path of the pressure regulating mechanism is communicated with a gas path of the gas density relay body, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay body; the method comprises the following steps:

Closing the valve by an intelligent control unit;

30. The method for calibrating a gas density relay according to claim 27, wherein the gas density relay further comprises a valve and a pressure regulating mechanism, wherein a gas path of the pressure regulating mechanism is communicated with a gas path of the gas density relay body, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay body; the method comprises the following steps:

Closing the valve by an intelligent control unit;

31. The method for calibrating a gas density relay according to claim 27, wherein the gas density relay further comprises a heating device and a valve, the heating device is connected with the intelligent control unit, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with a gas path of the gas density relay body; the method comprises the following steps:

The contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay, and the contact of the gas density relay body is connected to the intelligent control unit;

The intelligent control unit is used for controlling the heating device to heat, so that the temperature of the gas in the gas chamber between the valve and the gas density relay is changed, after the temperature reaches a set value, the valve is closed by the intelligent control unit, and then the heating device is closed by the intelligent control unit;

After the temperature or pressure of the air chamber is reduced to a proper value, the temperature of the gas density relay is increased by controlling the temperature regulating mechanism through the intelligent control unit, and then the temperature of the temperature compensating element of the gas density relay is increased, so that the gas density relay generates a contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to the pressure value and the temperature value during the contact action, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;

32. The method for calibrating a gas density relay according to claim 27, wherein the gas density relay further comprises a valve, a gas chamber and a heating device, the gas chamber is communicated with the gas density relay body, the heating device is arranged outside or inside the gas chamber, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with a gas path of the gas density relay body; the method comprises the following steps:

The intelligent control unit is used for controlling the heating device to heat, so that the temperature of the gas in the gas chamber is changed, after the temperature reaches a set value, the valve is closed through the intelligent control unit, and then the heating device is closed through the intelligent control unit;