CN110444442B

CN110444442B - Remote gas density relay system and verification method thereof

Info

Publication number: CN110444442B
Application number: CN201910830188.5A
Authority: CN
Inventors: 夏铁新; 贺兵; 常敏; 郭正操; 廖海明; 金海勇; 王恩林
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: 2023-09-26
Anticipated expiration: 2039-09-04
Also published as: CN110444442A

Abstract

The application discloses a remote gas density relay system and a verification method thereof, comprising the following steps: the background monitoring terminal is in remote communication with at least one gas density monitoring device through communication equipment, so that on-line monitoring and verification of the gas density relay are completed; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a pressure regulating mechanism, a valve, an on-line check joint signal sampling unit and a circuit control part; the background monitoring terminal controls the intelligent processor to close the valve, pressure is regulated to rise and fall through the pressure regulating mechanism, so that the gas density relay is subjected to contact action, the gas density value is transmitted to the intelligent processor through the on-line checking contact signal sampling unit, the intelligent processor detects the contact signal action value and/or return value according to the gas density value during contact action, the remote checking of the gas density relay can be completed without the need of an maintainer to the site, maintenance-free operation can be realized, and the benefit and the reliable and safe operation of a power grid are greatly improved.

Description

Remote gas density relay system and verification method thereof

Technical Field

The application relates to the technical field of electric power, in particular to a remote gas density relay system applied to high-voltage and medium-voltage electrical equipment and a verification method thereof.

Background

The gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage and medium-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 and medium-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 safe operation protection of the electrical equipment is realized.

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to the power departments and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the development of economy and high speed, the capacity of the power system in China is rapidly enlarged, and the use amount of SF6 electrical equipment is increased. The SF6 gas has the functions of arc extinction and insulation in high-voltage electrical equipment, and the density reduction and micro water content of the SF6 gas in the high-voltage electrical equipment seriously affect the safe operation of the SF6 high-voltage electrical equipment if exceeding the standards: 1) The reduction of SF6 gas density to a certain extent will lead to a loss of insulation and arc extinction properties. 2) Under the participation of some metal matters, SF6 gas can be hydrolyzed with water at a high temperature of more than 200 ℃ to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a large amount of heat so as to raise the pressure of the air chamber. 3) At reduced temperatures, excessive moisture may form condensation water, significantly reducing the insulation strength of the insulator surface and even flashover, causing serious damage. The grid operating regulations therefore mandate that the density and water content of SF6 gas must be periodically checked both before and during operation of the plant.

Along with the development of the unattended transformer substation to the networking and digitalization directions and the continuous enhancement of the requirements on remote control and remote measurement, the method has important practical significance on-line monitoring of the gas density and micro water content state of SF6 electrical equipment. Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation.

The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the gas density relay from happening and ensuring the safe and reliable operation of the electrical equipment. Both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the verification of the gas density relay is very important and popular in the power system at present, and various power supply companies, power plants and large factories and mines are implemented. And power supply companies, power plants and large-scale factories and mining enterprises are required to be equipped with testers, equipment vehicles and SF6 gas with high value for completing the on-site verification and detection work of the gas density relay. The method comprises the steps of roughly calculating the power failure business loss during detection, wherein the annual allocated detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the field check of the inspector is not in normal operation, potential safety hazards exist. Therefore, innovation is very necessary in the existing gas density self-checking gas density relay, especially in the gas density on-line self-checking gas density relay or system, so that the gas density relay or the monitoring system for on-line monitoring of the gas density also has the checking function of the gas density relay, and meanwhile, the wireless remote transmission function of the gas density is realized, thereby completing the periodic checking work of the (mechanical) gas density relay, without the need of maintenance personnel to go to the site, thereby greatly improving the working efficiency and reducing the cost.

Disclosure of Invention

The application aims to provide a remote gas density relay system and a verification method thereof, which are used for solving the problems in the technical background.

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

the first aspect of the present application provides a remote gas density relay system comprising:

the background monitoring terminal is in remote communication with at least one gas density monitoring device through communication equipment;

the communication equipment is used for realizing data transmission of the background monitoring terminal and the gas density monitoring device;

the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a pressure regulating mechanism, a valve, an on-line check joint signal sampling unit and a circuit control part; wherein, the liquid crystal display device comprises a liquid crystal display device,

the air inlet of the valve is provided with an interface communicated with electrical equipment, and the air outlet of the valve is communicated with the air path of the gas density relay;

the pressure regulating mechanism is communicated with the gas path of the gas density relay and is configured to regulate the pressure rise and fall of the gas path of the gas density relay so as to enable the gas density relay to generate contact signal action;

A gas density detection sensor comprising at least one pressure sensor and at least one temperature sensor; alternatively, a gas density transmitter consisting of a pressure sensor and a temperature sensor is employed; or, a density detection sensor adopting a quartz tuning fork technology; the gas density detection sensor is communicated with the gas density relay;

an on-line check contact signal sampling unit, directly or indirectly connected with the gas density relay, configured to sample a contact signal of the gas density relay at ambient temperature, the contact signal including an alarm, and/or a latch;

the circuit control part comprises a power supply for supplying power to each electric equipment and an intelligent processor; the intelligent processor is respectively connected with the gas density detection sensor, the pressure regulating mechanism, the valve, the on-line check joint signal sampling unit and the communication equipment, and is configured to directly control the closing or opening of the valve or receive a remote control instruction of the background monitoring terminal to control the closing or opening of the valve, so as to complete the control of the pressure regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition, detect the joint signal action value and/or the joint signal return value of the gas density relay, and send test data and/or check results to the background monitoring terminal through the communication equipment in real time.

Preferably, the background monitoring terminal comprises a storage device for storing data and/or information transmitted to the background monitoring terminal through the communication equipment.

Preferably, the background monitoring terminal comprises a display interface for man-machine interaction, displays current verification data in real time, and/or supports data input. Specifically, the method comprises real-time online gas density value display, pressure value display, temperature value display, change trend analysis, historical data query, real-time alarm and the like.

Preferably, the communication device is arranged at the shell of the gas density relay, or arranged at the shell of the circuit control part, or is in an integrated structure with the intelligent processor.

Preferably, the communication mode of the communication device is a wired communication mode or a wireless communication mode.

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

More preferably, the wireless communication mode includes, but is not limited to, one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.

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

Preferably, the gas density relay includes: a housing, a base, a pressure detector, a temperature compensation element, and a signal generator disposed in the housing; the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a barden tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.

More preferably, at least one temperature sensor is arranged near or on or integrated in the temperature compensation element of the gas density relay. Preferably, at least one temperature sensor is provided at an end of the pressure detector of the gas density relay near the temperature compensation element.

Further, an outgoing line sealing piece is arranged in the shell of the gas density relay, and a connecting wire of the temperature sensor is connected with the intelligent processor through the outgoing line sealing piece.

More preferably, the gas density relay further includes a heat insulator provided between a housing of the gas density relay and a housing of the circuit control section; alternatively, the heat insulator is disposed at the power supply.

More preferably, the housing of the gas density relay is filled with a vibration damping fluid.

More preferably, the power supply is located remotely from the temperature sensor and the temperature compensation element, wherein the remote refers to: in a normal working state, the heating of the power supply does not affect the temperature sensor and the temperature compensation element.

More preferably, the gas density relay further comprises a display mechanism, wherein the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and arranged in front of the dial, and the pointer is combined with the dial to display the gas density value.

Further, the gas density relay also comprises a digital device or a liquid crystal device with indication display.

Preferably, the gas density detection sensor is provided on the gas density relay; alternatively, the pressure regulating mechanism is arranged on the gas density relay; or the gas density detection sensor, the on-line check joint signal sampling unit and the intelligent processor are arranged on the gas density relay.

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

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 processor are arranged on the gas density transmitter.

Preferably, the probe of the pressure sensor is mounted on the gas path of the gas density relay.

Preferably, the pressure sensor is disposed in the housing of the gas density relay, or in the housing of the circuit control unit, or on the pressure adjustment mechanism, or on the valve.

Preferably, the probe of the temperature sensor is mounted on or outside the gas path of the gas density relay, or inside the gas density relay, or outside the gas density relay.

Preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor; both contact and non-contact; and may be a thermal resistor and a thermocouple.

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

More preferably, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is expressed, the verification result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is expressed, and the verification result is converted into the corresponding relative pressure value at 20 ℃;

when the pressure sensor is a relative pressure sensor, the pressure sensor is represented by a relative pressure value, the verification result is a corresponding relative pressure value at 20 ℃, the pressure sensor is represented by an absolute pressure value, and the verification result is converted into a corresponding absolute pressure value at 20 ℃;

the conversion relation between the absolute pressure value and the relative pressure value is as follows:

P _{absolute pressure of} ＝P _{Relative pressure} +P _{Standard atmospheric pressure} 。

More preferably, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (such as a baron tube with an induction coil), a resistive pressure sensor (such as a baron tube with a sliding wire resistance); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.

Preferably, the valve communicates with the electrical device directly or through a connection. Preferably, the valve is an electrically operated valve, and/or 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; or pressure or density detectors are respectively arranged on two sides of the gas path of the valve.

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; 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.

Preferably, the pressure regulating mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay, and the other end of the corrugated pipe stretches and contracts 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.

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.

More preferably, the air release valve is used for placing air to a zero position, the intelligent processor is used for collecting the pressure value at the time, comparing the pressure value to finish zero position verification of the pressure sensor, judging a comparison result by the intelligent processor or a background monitoring terminal, and sending an abnormal prompt if the error is out of tolerance: pressure sensors have problems.

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.

The pressure regulating mechanism can slowly increase or decrease the load when the gas density relay is boosted or depressurized; when the contact signal action value of the gas density relay is measured, the load change speed is not more than 10 per mill of the measuring range per second when approaching the action value, namely the pressure can be adjusted (can stably rise or fall).

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

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

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

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 liquid crystal display device comprises a liquid crystal display device,

the contacts include, but are not limited to, one of an alarm contact, an alarm contact + a lockout 1 contact + a lockout 2 contact, an alarm contact + a lockout contact + an overpressure contact.

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

Preferably, the contact of the gas density relay is a normally open type density relay, the on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and the contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connection circuit is opened or isolated, and the first connection 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 with the intelligent processor; or alternatively, the process may be performed,

the gas density relay comprises a gas density relay, an on-line verification contact signal sampling unit and an intelligent processor, wherein the contact of the gas density relay is a normally closed type density relay, the on-line verification contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connection circuit is opened or isolated, and the first connection circuit is closed; and 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 and the contact signal control loop, and communicates the second connection circuit to connect the contact of the gas density relay with the intelligent processor.

More 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;

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 is connected with the intelligent processor through the normally-open contact. And for a density relay with normally closed contacts, corresponding adjustment can be made.

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

More 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 joints of the light emitting diode and the gas density relay 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 processor, 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.

More 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 or directly in parallel through current limiting resistors, and after being connected in parallel, the light emitting diodes are connected with the contact of the gas density relay in series to form a closed loop, 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 processor 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 a 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.

Further, the contact sampling circuit further comprises 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 on 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. Alternatively, a diode may be used instead of a zener diode.

Still 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.

More 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 are connected in series to form a closed loop, and the contacts of the gas density relay 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 processor;

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.

More preferably, 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;

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 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 of the gas density relay is electrically connected with a circuit between the second silicon controlled rectifier and the fourth silicon controlled rectifier through a circuit.

Further, the cathode of the first silicon controlled rectifier is connected with the intelligent processor, 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 processor; the cathode of the second silicon controlled rectifier is connected with the intelligent processor, 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 processor.

Preferably, the intelligent processor acquires a gas density value acquired by the gas density detection sensor; or the intelligent processor acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density by the gas density monitoring device, namely, completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density monitoring device.

More preferably, the intelligent processor calculates the gas density value using a mean method (average method) of: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all N acquired gas density values at different time points to obtain gas density values; or alternatively, the process may be performed,

in a set time interval and a set temperature interval step length, carrying out average value calculation processing on density values corresponding to N different temperature values acquired in all temperature ranges to obtain gas density values; or alternatively, the process may be performed,

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 variation ranges to obtain a gas density value;

Wherein N is a positive integer greater than or equal to 1.

Preferably, the intelligent processor acquires a gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or is switched, so as to complete on-line verification of the gas density relay; or alternatively, the process may be performed,

the intelligent processor acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay generates joint 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 intelligent processor 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 processor 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 processor 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 system supports the input of basic information of the monitoring device, including, but not limited to, one or more of factory number, precision requirements, rated parameters, manufacturing plant, and operating location.

More preferably, the electrical interface is provided with an electrical interface protection circuit that prevents damage to the interface due to misconnection by a user, and/or prevents electromagnetic interference.

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

Preferably, the control of the intelligent processor is controlled by a field control and/or by the background monitoring terminal.

More preferably, the intelligent processor completes the on-line verification of the gas density relay according to the setting of the background monitoring terminal or a remote control instruction; or, according to the set verification time of the gas density relay, completing the on-line verification of the gas density relay.

Preferably, the circuit of the intelligent processor comprises an intelligent processor protection circuit, and the intelligent processor protection circuit comprises one or more of an anti-static interference circuit (such as ESD and EMI), an anti-surge circuit, an electric rapid protection circuit, an anti-radio frequency field interference circuit, an anti-pulse group interference circuit, a power supply short-circuit protection circuit, a power supply reverse protection circuit, an electric contact misconnection protection circuit and a charging protection circuit.

Preferably, the power supply comprises a power supply circuit, a battery, a recyclable battery, solar energy, a power supply obtained by taking electricity from a mutual inductor, or an induction power supply.

Preferably, the remote gas density relay system further comprises a shielding member capable of shielding an electric field and/or a magnetic field, and the shielding member is arranged in or outside the shell of the circuit control part; or alternatively, the process may be performed,

the shielding piece is arranged on the intelligent processor and/or the communication equipment; or alternatively, the process may be performed,

the shield is disposed on the pressure sensor.

The shielding piece utilizes the reflection and/or absorption effects of the shielding material to reduce the EMI radiation, and the addition of the shielding material can effectively reduce or eliminate unnecessary gaps, inhibit electromagnetic coupling radiation and reduce electromagnetic leakage and interference; the electromagnetic shielding material (such as iron) with higher electric conductivity and magnetic conductivity can be used, the shielding performance is generally required to be 40-60 dB, specifically, the circuit control part is sealed in a shell made of shielding material, the circuit control part is well sealed, and the interference problem caused by electromagnetic leakage due to the electric conduction discontinuity of a gap can be solved.

Preferably, the intelligent processor compares the environmental temperature value with the temperature value acquired by the temperature sensor to complete the verification of the temperature sensor.

Preferably, the gas density relay is provided with a comparison density value output signal which is connected with the intelligent processor; alternatively, the gas density relay has a comparison pressure value output signal that is coupled to the intelligent processor.

More preferably, when the gas density relay outputs a comparison density value output signal, the intelligent processor collects the current gas density value, performs comparison, and completes the comparison density value verification of the gas density relay, and the intelligent processor or/and the background monitoring terminal judges the comparison result, if the error is out of tolerance, an abnormality prompt is sent; or alternatively, the process may be performed,

when the gas density relay outputs a comparison density value output signal, the intelligent processor collects the current gas density value, performs comparison, completes mutual verification of the gas density relay and the gas density detection sensor, judges comparison results of the intelligent processor or/and a background monitoring terminal, and sends out an abnormality prompt if the errors are out of tolerance; or alternatively, the process may be performed,

When the gas density relay outputs a comparison pressure value output signal, the intelligent processor collects the current pressure value, performs comparison, completes mutual verification of the gas density relay and the gas density detection sensor, judges comparison results by the intelligent processor or/and the background monitoring terminal, and sends out an abnormality prompt if the errors are out of tolerance.

Preferably, a remote gas density relay system of the present application comprises at least two gas density detection sensors, each gas density detection sensor comprising a pressure sensor, a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

Preferably, the gas density detection sensor comprises at least two pressure sensors, the pressure values acquired by the pressure sensors are compared, and the mutual verification of the pressure sensors is completed.

Preferably, the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete the mutual verification of the temperature sensors.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or, the pressure value collected by each pressure sensor and the temperature value collected by each temperature sensor are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely, gas density values, and each gas density value is compared, so that the mutual verification of each pressure sensor and each temperature sensor is completed; or comparing the gas density values obtained by the pressure sensors and the temperature sensors with comparison density value output signals output by the gas density relay to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.

Preferably, after the gas density relay is verified, the intelligent processor automatically generates a verification report of the gas density relay, if the verification report is abnormal, an alarm is sent out, and the verification report is uploaded to a remote end or sent to a designated receiver.

In a preferred embodiment, the gas density relay further comprises a multi-way joint, the gas density relay, the valve, the pressure regulating mechanism being disposed on the multi-way joint; alternatively, the intelligent processor is disposed on the multi-way joint.

More preferably, the gas path of the gas density relay 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 circuit of the gas density relay; the gas outlet of the valve is communicated with a third joint of the multi-way joint, and the third joint is communicated with the first joint, so that the gas outlet of the valve is communicated with a gas path of the pressure regulating mechanism and/or a gas path of the gas density relay.

Further, a connecting part which is in butt joint with electrical equipment is arranged at the third joint of the multi-way joint, and the valve is embedded in the connecting part.

In a preferred embodiment, the gas density relay, the valve, and the pressure regulating mechanism are connected together by a connecting pipe.

More preferably, the gas path of the pressure regulating mechanism is communicated with the gas path of the gas density relay through a first connecting pipe; the gas outlet of the valve is directly communicated with the gas path of the gas density relay through a second connecting pipe, or the gas outlet of the valve is connected with the gas path of the pressure regulating mechanism through a second connecting pipe, so that the valve is communicated with the gas path of the gas density relay.

Preferably, the gas density relay further comprises a self-sealing valve mounted between the electrical device and the valve; alternatively, the valve is mounted between an electrical device and the self-sealing valve.

Preferably, the gas density relay 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.

More preferably, the remote gas density relay system can count the number of times of gas replenishment, or the amount of gas replenishment, or the time of gas replenishment.

Preferably, the remote gas density relay system can perform online gas supplementing.

Preferably, the remote gas density relay system may perform online gas drying.

Preferably, the remote gas density relay system further comprises: and the micro water sensor is used for monitoring the micro water value of the gas on line and is respectively connected with the gas density relay and the intelligent processor.

More preferably, the remote gas density relay system further comprises: the gas circulation mechanism is respectively connected with the gas density relay and the intelligent processor and comprises a capillary tube, a sealing cavity and a heating element, and gas flow is realized through the heating element, so that the micro-water value in the gas is monitored on line.

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 remote gas density relay system further comprises: and the decomposition product sensor is used for monitoring the gas decomposition products on line and is respectively connected with the gas density relay and the intelligent processor.

Preferably, the gas density relay further comprises a contact resistance detection unit; the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator in the gas density relay; 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, the remote gas density relay system further comprises a camera for monitoring.

Preferably, the remote gas density relay system monitors a gas density value, or a density value, a pressure value and a temperature value on line; or the remote gas density relay system remotely transmits the monitored gas density value, or the density value, the pressure value and the temperature value.

Preferably, the remote gas density relay system has a self-diagnosis function and can timely notify an abnormality. Such as wire breaks, short circuit alarms, sensor damage, gas pressure trends, etc.

Preferably, the remote gas density relay system has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not performed, and a notification signal is sent out.

Preferably, the remote gas density relay system is provided with a heater and/or a heat sink (e.g. a fan), the heater being turned on when the temperature is below a set point and the heat sink (e.g. a fan) being turned on when the temperature is above a set point.

Preferably, when the gas density relay generates a signal receiving action, the remote gas density relay system detects or detects and determines the contact resistance of the contact point of the gas density relay. Specifically, a contact point contact resistance measuring circuit is added on the gas density relay, and the gas density relay is measured by adopting a bridge method or a voltage and current method.

Preferably, the remote gas density relay system further comprises an insulating piece, and the pressure sensor is connected with the pressure sensor fixing seat through the insulating piece, or is fixed on the pressure sensor fixing seat through the insulating piece in a sealing way.

Preferably, the remote gas density relay system further comprises an analysis system (e.g. expert management analysis system) for monitoring the gas density value, the electrical performance of the gas density relay, and detecting, analyzing and determining the monitoring element.

Preferably, at least two gas density monitoring devices are connected with the background monitoring terminal sequentially through a hub and a protocol converter; wherein, each gas density monitoring device is arranged on corresponding electrical equipment respectively.

More preferably, the hub is an RS485 hub.

More preferably, the protocol converter employs an IEC61850 or IEC104 protocol converter.

More preferably, the protocol converter is further connected to a network service printer and a network data router, respectively.

The second aspect of the present application provides a method for verifying a gas density relay system, comprising:

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

the gas density monitoring device is used for checking the gas density relay according to the set checking time and the gas density value condition under the condition that the gas density relay is allowed to check:

closing the valve by the intelligent processor;

the intelligent processor drives the pressure regulating mechanism to enable the gas pressure to slowly drop, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent processor through the on-line checking contact signal sampling unit, the intelligent processor directly obtains the gas density value according to the pressure value and the temperature value during the contact action, 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 processor opens the valve.

Preferably, a method of calibrating a gas density relay system includes:

in a normal working state, the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, 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 processor;

closing the valve by the intelligent processor;

the on-line checking contact signal sampling unit is adjusted to a checking state by the intelligent processor, and in the checking state, the on-line checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay to connect a contact of the gas density relay to the intelligent processor;

The intelligent processor drives the pressure regulating mechanism 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 processor through the on-line checking contact signal sampling unit, the intelligent processor directly obtains the gas density value according to the pressure value and the temperature value during contact reset, 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 works are completed, the intelligent processor opens the valve, and adjusts the on-line checking contact signal sampling unit to a working state, and the contact signal control loop of the gas density relay resumes to operate in a normal working state.

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

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 monitoring terminal.

Preferably, the verification method further comprises: the intelligent processor is controlled by field control and/or by a background monitoring terminal.

Compared with the prior art, the technical scheme of the application has the following beneficial effects: the application provides a remote gas density relay system and a verification method thereof, which are used for high-voltage and medium-voltage electrical equipment, and comprise a background monitoring terminal, wherein the remote control is realized through communication equipment and at least one gas density monitoring device, so that the on-line monitoring and verification of a gas density relay are completed; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a pressure regulating mechanism, a valve, an on-line check contact signal sampling unit and a circuit control part, wherein the circuit control part comprises a power supply and an intelligent processor. The background monitoring terminal controls the intelligent processor to close the valve, so that the gas density relay is separated from the electrical equipment on the gas path; the pressure regulating mechanism regulates the pressure to rise and fall, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent processor through the on-line checking contact signal sampling unit, the intelligent processor detects an alarm and/or locking contact signal action value and/or a return value of the gas density relay according to the gas density value during contact action, remote checking work of the gas density relay can be completed without the need of an maintainer to the site, the reliability of a power grid is improved, the efficiency is improved, the cost is reduced, and maintenance-free of the gas density relay can be realized. At the same time, the application realizes SF in the whole checking process ₆ The zero emission of gas meets the requirements of environmental protection regulations.

Drawings

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

FIG. 1 is a schematic diagram of a gas density relay according to a first embodiment;

FIG. 2 is a schematic diagram of a gas density monitoring apparatus according to the first embodiment;

FIG. 3 is a schematic diagram of a control circuit of a gas density monitoring apparatus according to the first embodiment;

FIG. 4 is a schematic diagram of a gas density monitoring apparatus according to a second embodiment;

FIG. 5 is a schematic view of a gas density monitoring apparatus according to a third embodiment;

FIG. 6 is a schematic diagram of a gas density monitoring apparatus according to a fourth embodiment;

FIG. 7 is a schematic view of a gas density monitoring apparatus according to a fifth embodiment;

FIG. 8 is a schematic view showing the structure of a gas density monitoring apparatus according to a sixth embodiment;

FIG. 9 is a schematic view showing the structure of a gas density monitoring apparatus according to a seventh embodiment;

FIG. 10 is a schematic view showing the structure of a gas density monitoring apparatus according to an eighth embodiment;

FIG. 11 is a schematic view showing the structure of a gas density monitoring apparatus according to a ninth embodiment;

FIG. 12 is a schematic view showing the structure of a gas density monitoring apparatus according to a tenth embodiment;

FIG. 13 is a schematic view showing the structure of a gas density monitoring apparatus according to an eleventh embodiment;

FIG. 14 is a schematic diagram of a control circuit of a gas density monitoring apparatus according to a twelfth embodiment;

FIG. 15 is a schematic diagram of a control circuit of a gas density monitoring apparatus according to a thirteenth embodiment;

FIG. 16 is a schematic diagram of a control circuit of a gas density monitoring apparatus according to a fourteenth embodiment;

FIG. 17 is a schematic diagram of a control circuit of a gas density monitoring apparatus of a fifteen embodiment;

FIG. 18 is a schematic diagram of a 4-20mA density transmitter circuit on a gas density relay;

FIG. 19 is a schematic view showing the structure of a gas density monitoring apparatus according to a seventeenth embodiment;

FIG. 20 is a schematic diagram of a remote gas density relay system according to an embodiment eighteenth;

FIG. 21 is a schematic diagram of the architecture of a remote gas density relay system according to nineteenth embodiment;

fig. 22 is a schematic diagram of a remote gas density relay system according to a twenty-first embodiment.

Detailed Description

The invention provides a remote gas density relay system and a verification method thereof, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Embodiment one:

fig. 1 is a schematic diagram of a gas density relay. As shown in fig. 1, the gas density relay 1 includes: a housing 101, a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, and a dial 107, which are provided in the housing 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, a cross beam is arranged at the other end of the temperature compensation element 104, and an adjusting piece for pushing the signal generator 109 and enabling a contact of the signal generator 109 to be connected or disconnected is arranged on the cross beam. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core of the machine 105 and is provided in front of the dial 107, the pointer 106 displaying a gas density value in conjunction with the dial 107. The gas density relay 1 may also comprise a digital device or a liquid crystal device with an indication display.

Fig. 2 is a schematic diagram of a gas density monitoring apparatus. As shown in fig. 2, the gas density relay includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6, the intelligent processor 7, the multi-way joint 9 and the air supplementing interface 10. The gas density relay 1, the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supplementing interface 10 are arranged on the multi-way joint 9. Specifically, the air inlet of the valve 4 is provided with an interface communicated with electrical equipment, the air inlet of the valve is connected to the electrical equipment in a sealing way and is communicated with an air chamber of the electrical equipment, and the air outlet of the valve 4 is communicated with the gas density relay 1 through a multi-way joint 9; the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path through a multi-way joint 9; the pressure regulating mechanism 5 is communicated with the gas density relay 1 through a multi-way joint 9; the on-line checking contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent processor 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 are respectively connected with the intelligent processor 7; the air supplementing interface 10 is communicated with the multi-way joint 9.

FIG. 3 is a schematic diagram of a control circuit of a gas density monitoring apparatus. As shown in fig. 3, the on-line checking contact signal sampling unit 6 of the present embodiment is provided with a protection circuit, and includes a first connection circuit and a second connection circuit, where the first connection circuit connects the contact of the gas density relay 1 with the contact signal control circuit, the second connection circuit connects the contact of the gas density relay 1 with the intelligent processor 7, and in a non-checking state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit 6 cuts off the first connection circuit, communicates with the second connection circuit, and connects the contacts of the gas density relay 1 with the intelligent processor 7.

Specifically, the first connection circuit includes a first relay J1, and the second connection circuit includes 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 with a joint P of the gas density relay 1 _J Applying; the first relay J1 and the second relay J2 may be integrated, that is, a relay having normally open and normally closed contacts. In the non-verification state, the normally-closed joints J11 and J12 are closed, and the normally-open joints J21 and J12 are closedJ22 is disconnected, and the gas density relay monitors the contact P in real time _J Output state of (2); in the verification state, the normally-closed contacts J11 and J12 are opened, the normally-open contacts J21 and J22 are closed, and the contact P of the gas density relay 1 _J Is connected with the intelligent processor 7 through the normally open contacts J21 and J22.

The intelligent processor 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. The pressure sensor 2 for 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 pressure regulating mechanism 5 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.

The working principle of the first embodiment is as follows:

the intelligent processor 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 pressure value P at 20 DEG C ₂₀ (i.e., gas density values). When the gas density relay 1 needs to be checked, if the gas density value P is ₂₀ The set security check density value P is not less than _S The intelligent processor 7 controls the closing of the valve 4 so that the gas density relay 1 is isolated from the electrical equipment on the gas path.

Then, the intelligent processor 7 controls the contact signal control loop of the open gas density relay 1, namely, the constant of the first relay J1 of the on-line check contact signal sampling unit 6The closing points J11 and J12 are disconnected, so that the safety operation of the electrical equipment is not affected when the gas density relay 1 is checked on line, and an alarm signal is not sent out by mistake or a control loop is closed when the gas density relay 1 is checked. Since the gas density value P is already carried out before the start of the verification ₂₀ The set security check density value P is not less than _S The gas of the electrical equipment is in a safe operating range, moreover, the gas leakage is a slow process, and the gas is safe during verification. Meanwhile, the joint sampling circuit of the joint of the gas density relay 1 is communicated through the intelligent processor 7, namely normally open joints J21 and J22 of a second relay J2 of the on-line checking joint signal sampling unit 6 are closed, and at the moment, a joint P of the gas density relay 1 _J Is connected to the intelligent processor 7 through normally open contacts J21 and J22 of the second relay J2.

Then, the intelligent processor 7 controls the driving part 52 (which can be mainly realized by a motor and a gear, and has various and flexible modes) of the pressure regulating mechanism 5, so as to regulate the volume change of the pressure regulating mechanism 5, gradually reduce the pressure of the gas density relay 1, enable the gas density relay 1 to generate a contact signal action, the contact signal action is uploaded to the intelligent processor 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, and the intelligent processor 7 converts the pressure value P and the temperature T value measured during the contact signal action into the pressure value P corresponding to 20 ℃ according to the gas characteristics ₂₀ (density value), the contact operation value P of the gas density relay can be detected _D20 . After all the contact signal action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent processor 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 5, the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay 1 is tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay is completed.

After the verification is completed, the normally open connection of the second relay J2 of the on-line verification contact signal sampling unit 6Points J21 and J22 are disconnected, at which point P of gas density relay 1 _J The normally open contacts J21 and J22 of the second relay J2 are disconnected from the intelligent processor 7 by opening them. The intelligent processor 7 controls the valve 4 to open so that the gas density relay 1 is communicated with the electrical equipment on the 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 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.

When the gas density relay 1 completes the verification work, the gas density relay system makes a judgment, and the detection result can be notified. The mode is flexible, and specifically can: 1) The gas density relay system may be announced in situ, for example by an indicator light, a number or a liquid crystal, etc.; 2) Or uploading is implemented in an online remote communication mode, for example, the method can be uploaded to a background monitoring terminal; 3) Or uploading to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) Or uploaded by another route; 5) Or uploading the abnormal result through an alarm signal line or a special signal line; 6) Alone or in combination with other signal bundles. In short, after the gas density relay system completes the online checking work of the gas density relay 1, if an abnormality exists, an alarm can be automatically sent out, and the alarm can be uploaded to a far end or can be sent to a designated receiver, such as a mobile phone. Alternatively, after the verification is completed, if there is an abnormality, the intelligent processor 7 may upload the remote end (monitoring room, background monitoring platform, etc.) through the alarm contact signal of the gas density relay 1, and may also display a notice on site. And the simple online verification can upload the result with the abnormality in verification through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with the alarm signal contact, and the alarm signal contact is regularly closed and opened, so that the situation can be obtained through analysis; or uploaded through a separate verification signal line. The method can be used for uploading states well or problems, uploading the verification result through a single verification signal line, displaying the verification result on site, alarming the verification result on site or uploading the verification result through wireless uploading, and uploading the verification result on a network with a smart phone. The communication mode is wired or wireless, and the wired communication mode CAN be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, hart, IIC, SPI, wire, coaxial cable, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module (such as NB-IOT) built in a sensor, and the like. In a word, the reliable performance of the gas density relay system can be fully ensured in multiple modes and multiple combinations.

The gas density relay system has a safety protection function, namely when the gas density relay system is lower than a set value, the gas density relay system automatically does not perform on-line verification on the gas density relay 1 any more and sends out a notification signal. For example, when it is detected that the gas density value is smaller than the set value P _S When the test is finished, the test is not performed; only when the gas density value is more than or equal to (alarm pressure value +0.02MPa), the on-line verification can be performed.

The gas density relay system can perform online verification according to a set time, and can also perform online verification according to a set temperature (such as a limit high temperature, a limit low temperature, a normal temperature, 20 ℃ and the like). When the high temperature, low temperature, normal temperature and 20 ℃ environment temperature are checked online, the error judgment requirements are different, for example, when the 20 ℃ environment temperature is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and the accuracy requirement can be 2.5 level at high temperature. And can be implemented according to the related standard according to the temperature requirement. For example, according to the specification of 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the precision requirement corresponding to each temperature value is required.

The gas density relay system is capable of comparing its error performance for different periods of time depending on the temperature of the gas density relay 1. That is, the comparison in the same temperature range at different times determines the performance of the gas density relay 1 and the electrical equipment, and the comparison in each time of the history and the comparison in the history with the present are performed.

The electrical device may be repeatedly checked a plurality of times (for example, 2 to 3 times), and the average value thereof is calculated based on the result of each check.

If necessary, the gas density relay 1 can be checked online at any time.

Wherein, gas density relay 1 includes: a bimetal-compensated gas density relay, a gas-compensated gas density relay, or a bimetal and gas-compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; density relay with indication (density relay with pointer display, or density relay with digital display, density relay with liquid crystal display), density relay without indication (i.e. density switch); SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relay, and the like.

Type of pressure sensor 2: the absolute pressure sensor, the relative pressure sensor, or the absolute pressure sensor and the relative pressure sensor may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip type pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Bardon tube), and a resistance pressure sensor (such as a pressure measurement sensor with a sliding wire resistance attached to a Bardon tube), and can be an analog quantity pressure sensor or a digital quantity pressure sensor. The pressure acquisition is a pressure sensor, a pressure transducer, or other various pressure sensing elements, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistive strain gauge, ceramic strain gauge).

The temperature sensor 3 may be: thermocouple, thermistor, semiconductor type; both contact and non-contact; and may be a thermal resistor and a thermocouple. In short, various temperature sensing elements such as a temperature sensor and a temperature transmitter can be used for temperature acquisition.

The control of the valve 4 can adopt various transmission modes, such as manual operation, electric operation, hydraulic operation, pneumatic operation, turbine operation, electromagnetic hydraulic operation, electro-hydraulic operation, pneumatic operation, spur gear, bevel gear drive and the like; the valve can be operated according to preset requirements under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can enable the opening and closing piece to do lifting, sliding, swinging or rotating movement by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve is changed to realize the control function of the valve. The valves 4 may be of the automatic valve type, the power driven valve type and the manual valve type in a driving manner. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric (motor) drive. The valve 4 may be automatic or manual or semi-automatic. The verification process can be automatically completed or semi-automatically completed by manual cooperation. The valve 4 is directly or indirectly connected with the electrical equipment through a self-sealing valve, a manual valve or a non-dismantling valve, and is integrated or separated. The valve 4 may be of a normally open type, a normally closed type, a unidirectional type, or a bidirectional type, as required. In short, the gas circuit is opened or closed by the electric control valve. The electric control valve adopts the following modes: solenoid valves, electrically controlled ball valves, electrically controlled proportional valves, and the like.

The pressure regulating mechanism 5 of this embodiment is one end open-ended cavity, there is the piston 51 in the cavity, the piston 51 is equipped with sealing washer 510, the one end of piston 51 is connected with a regulation pole, the outer end of regulation pole is connected with drive part 52, the other end of piston 51 stretches into in the opening, and with the inner wall of cavity contacts, drive part 52 drive the regulation pole and then drive piston 51 removes in the cavity. The drive component 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a reciprocating mechanism, a Carnot cycle mechanism, a pneumatic element.

The on-line checking contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay 1. Namely, the basic requirements or functions of the on-line check contact signal sampling unit 6 are: 1) The safety operation of the electrical equipment is not affected during verification. When the contact signal of the gas density relay 1 acts during verification, the safe operation of the electrical equipment is not affected; 2) The contact signal control loop of the gas density relay 1 does not affect the performance of the gas density relay, particularly the performance of the intelligent processor 7, and the gas density relay is not damaged or the testing work is not affected.

The basic requirements or functions of the intelligent processor 7 are: control of the valve 4, control of the pressure regulating mechanism 5 and signal acquisition are accomplished by the intelligent processor 7. The realization is as follows: the pressure value and the temperature value at the time of the contact signal generation operation of the gas density relay 1 can be detected and converted into the corresponding pressure value P at 20 DEG C ₂₀ (Density value), namely, the contact operation value P of the gas Density Relay 1 can be detected _D20 The verification work of the gas density relay 1 is completed. Alternatively, the density value P at the time of the contact signal generation operation of the gas density relay 1 can be directly detected _D20 The verification work of the gas density relay 1 is completed.

Of course, the intelligent processor 7 may also implement: storing test data; and/or test data derivation; and/or the test data is printable; and/or can carry out data communication with an upper computer; and/or analog quantity, digital quantity information may be entered. The intelligent processor 7 further comprises a communication module, and the communication module is used for realizing remote transmission of information such as test data and/or verification results; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent processor 7 simultaneously collects the current density value, and the rated pressure value verification of the gas density relay 1 is completed.

Electrical equipment, including SF6 gas electrical equipment, SF6 gas mixture electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment. In particular, electrical devices include GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas tanks, ring main units, and the like.

The gas density relay system has the functions of pressure and temperature measurement and software conversion. On the premise of not affecting the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay 1 can be detected on line. Of course, the return value of the alarm and/or lockout contact signals may be left untested as desired.

When the gas density relay system finishes the verification of the gas density relay, mutual comparison judgment can be automatically carried out, and if the error phase difference is large, an abnormal prompt can be sent out: gas density relays or pressure sensors and temperature sensors have problems. The gas density relay system can complete the mutual calibration function of a gas density relay and a pressure sensor, a temperature sensor or a density transmitter, and has artificial intelligent calibration capability; after the verification work is finished, a verification report can be automatically generated, if the verification report is abnormal, an alarm can be automatically sent out, or the verification report can be sent to a designated receiver, for example, a mobile phone; the gas density value and the verification result are displayed on site, or the gas density value and the verification result are displayed through a background, so that the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data inquiry, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the system has a self-diagnosis function, and can timely notify abnormality, such as disconnection, short-circuit alarm, sensor damage and the like; the comparison of the error performance of the gas density relay system can be performed at different temperatures and for different time periods according to the gas density relay system. I.e., comparison over the same temperature range at different times, determines the performance of the gas density relay system. The comparison of each period of the history and the comparison of the history and the current. The gas density value, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 of the electrical equipment can be judged, analyzed and compared normally and abnormally; the system also comprises an analysis system (expert management analysis system) for detecting, analyzing and judging the gas density value, the gas density relay and the monitoring element and knowing where the problem point is; the contact signal state of the gas density relay 1 is also monitored, and the state is remotely transmitted. The state of the contact signal of the gas density relay 1 can be known to be open or closed in the background, so that one more layer of monitoring is performed, and the reliability is improved; the temperature compensation performance of the gas density relay 1 can be detected or detected and judged; the contact resistance of the contact point of the gas density relay 1 can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

As long as the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the gas density relay system can be indicated to be normal, thus the gas density relay can be not required to be checked, other devices can not be checked, and the whole service life can be free from checking. Unless the test data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electrical device in the transformer substation are inconsistent and abnormal, maintenance personnel are not scheduled to process. And for the anastomotic and normal conditions, the verification is not needed, so that the reliability is greatly improved, the efficiency is greatly improved, and the cost is reduced.

Embodiment two:

as shown in fig. 4, a gas density monitoring apparatus includes: the gas density relay 1 (the gas density relay 1 mainly comprises a shell, a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators and electrical equipment connecting joints which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 7.

The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint 1010, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent processor 7 are arranged on or in the shell of the gas density relay 1, and the pressure sensor 2 is communicated with the pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the on-line checking joint signal sampling unit 6 and the intelligent processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with the intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

The difference from the first embodiment is that the pressure adjusting mechanism 5 of this embodiment is a cavity with one open end, the cavity is internally provided with a piston 51, the piston 51 is provided with a sealing ring 510, one end of the piston 51 is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving component 52, the other end of the piston 51 extends into the opening and contacts with the inner wall of the cavity, the driving component 52 drives the adjusting rod to drive the piston 51 to move in the cavity, so that the sealing part in the cavity changes in volume, and the lifting of the pressure is completed. The drive component 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a reciprocating mechanism, a Carnot cycle mechanism, a pneumatic element.

In another preferred embodiment, the pressure regulating mechanism 5 may also be a solenoid valve, which is sealed inside a housing. The pressure regulating mechanism 5 is controlled by the intelligent processor 7, so that the electromagnetic valve is opened, the pressure change occurs, and the pressure lifting is completed.

In another preferred embodiment, the pressure regulating mechanism 5 may also be composed of a bellows and a driving part 52, wherein the bellows is connected with the pressure detector of the gas density relay 1 in a sealing way to form a reliable sealing cavity. The pressure regulating mechanism 5 is controlled by the intelligent processor 7, so that the driving part 52 pushes the corrugated pipe to change the volume, and the sealed cavity changes the volume, thereby completing the pressure lifting.

In another preferred embodiment, the pressure adjusting mechanism 5 may also consist of an air chamber, a heating element and a heat preservation piece, wherein the heating element is arranged outside (or inside) the air chamber, and the temperature is changed by heating, so that the pressure is raised and lowered.

Of course, the pressure adjusting mechanism 5 may have various other forms, and other mechanisms capable of achieving the pressure raising and lowering function are also included in the scope of the present application.

The pressure is regulated by the pressure regulating mechanism 5, so that the signal generator of the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the on-line checking contact signal sampling unit 6, the intelligent processor 7 converts the gas density value when the gas density relay 1 generates contact action into a corresponding gas density value according to the pressure value and the temperature value, and the alarming and/or locking contact signal action value and/or return value of the gas density relay are detected, so that the checking work of the gas density relay is completed. Or only detecting the alarm and/or locking contact action value to complete the checking work of the gas density relay.

Embodiment III:

as shown in fig. 5, in one gas density monitoring device, a gas supplementing port 10 and a self-sealing valve 11 are added in comparison with the second embodiment. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing way, and the other end of the self-sealing valve 11 is communicated with the air inlet of the valve 4 and the air supplementing connector 10 through a connecting pipe.

Embodiment four:

as shown in fig. 6, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the base of the gas density relay 1, the pressure sensor 2 and the pressure regulating mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are arranged at the rear side of the shell of the gas density relay 1. The on-line checking contact signal sampling unit 6 and the intelligent processor 7 are arranged on the electric equipment connecting joint. The pressure sensor 2 is communicated with the pressure detector on the gas path through the base of the gas density relay 1; the pressure regulating mechanism 5 communicates with the pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent processor 7. Unlike the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjustment mechanism 5 are provided at the rear side of the housing of the gas density relay 1.

Fifth embodiment:

as shown in fig. 7, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is communicated with a connecting pipe, the connecting pipe is communicated with a pressure detector of the gas density relay 1, and the pressure sensor 2 and the pressure regulating mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the pressure detector are communicated on an air path. The gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7 are arranged in a shell; the on-line checking joint signal sampling unit 6 and the intelligent processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent processor 7; the valve 4 is connected with the intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

In contrast to the first embodiment, the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check contact signal sampling unit 6 and the intelligent processor 7 are arranged in a single housing. 1) The pressure adjusting mechanism 5 of the present embodiment is mainly composed of a piston 51, a driving member 52. The piston 51 is connected with the pressure detector and the pressure sensor 2 of the gas density relay 1 in a sealing way to form a reliable sealing cavity. The pressure regulating mechanism 5 is controlled by the intelligent processor 7, so that the driving part 52 pushes the piston 51 to move, the volume of the sealed cavity is changed, and the pressure is lifted. 2) The pressure sensor 2 and the temperature sensor 3 are arranged in a shell, and can also be gas density transmitters which are combined together to directly obtain the density value, the pressure value and the temperature value of the gas.

Example six:

as shown in fig. 8, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The gas density relay 1, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent processor 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on the gas path; the pressure regulating mechanism 5 is in communication with the pressure detector of the gas density relay 1 on the gas path. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent processor 7.

In contrast to the first embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving member 52. The pressure regulating mechanism 5 is controlled by the intelligent processor 7, so that the driving part 52 pushes the air bag 53 to change the volume, and the pressure is raised and lowered.

Embodiment seven:

as shown in fig. 9, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6, the intelligent processor 7 and the multi-way joint 9. The air inlet of the valve 4 is connected to the equipment connecting joint in a sealing way, and the air outlet of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way joint 9, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is arranged on the multi-way joint 9, and the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1; the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent processor 7 are arranged together and are arranged on the multi-way joint 9; the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure regulating mechanism 5 are respectively connected with the intelligent processor 7.

The difference from the first embodiment is that: the pressure adjusting mechanism 5 of the present embodiment is mainly composed of a bellows 54, a driving member 52. The bellows 54 is connected with the pressure detector of the gas density relay 1 in a sealing way to form a reliable sealing cavity. The pressure regulating mechanism 5 is controlled by the intelligent processor 7, so that the driving part 52 pushes the corrugated pipe 54 to change in volume, and the sealing cavity changes in volume, so that the pressure is lifted. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the on-line checking contact signal sampling unit 6, the intelligent processor 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarming and/or locking contact action value and/or the return value of the gas density relay 1 are detected, so that the checking work of the gas density relay 1 is completed.

Example eight:

as shown in fig. 10, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path. The pressure regulating mechanism 5 is in communication with a pressure detector of the gas density relay 1. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with the intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

In contrast to the first exemplary embodiment, the valve 4 is sealed inside the first housing 41, and the control cables of the valve 4 are led out via a first outlet seal 42 sealed to the first housing 41, which ensures that the valve 4 remains sealed and can be operated reliably for a long period of time. The pressure regulating mechanism 5 is sealed inside the second shell 55, and a control cable of the pressure regulating mechanism 5 is led out through a second lead-out wire sealing piece 56 sealed with the second shell 55, so that the pressure regulating mechanism 5 is designed to keep sealed, and can reliably work for a long time. The second housing 55 and the first housing 41 may be integrated.

Example nine:

as shown in fig. 11, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, the air outlet of the valve 4 is connected with the pressure regulating mechanism 5, and the pressure sensor 2 is arranged on the pressure regulating mechanism 5. The temperature sensor 3, the on-line checking joint signal sampling unit 6, the intelligent processor 7 and the gas density relay 1 are arranged on the pressure regulating mechanism 5. The pressure detector of the gas density relay 1, the pressure sensor 2, the pressure regulating mechanism 5 and the valve 4 are communicated on a gas path. The temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with the intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

Example ten:

as shown in fig. 12, a gas density monitoring apparatus includes: the gas density relay 1, the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31, the second temperature sensor 32, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure regulating mechanism 5. The gas density relay 1, the first temperature sensor 31, the on-line check joint signal sampling unit 6 and the intelligent processor 7 are arranged together and on the pressure regulating mechanism 5; the first pressure sensor 21 is provided on the pressure adjusting mechanism 5. The second pressure sensor 22 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection is connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on the gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected with the intelligent processor 7; the valve 4 is connected with the intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

Unlike the first embodiment, the two pressure sensors are respectively a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The second temperature sensor 32 may be omitted in this embodiment. The embodiment is provided with a plurality of pressure sensors and temperature sensors, and the pressure values obtained by monitoring the pressure sensors can be compared and checked with each other; the temperature values obtained by the temperature sensors can be compared and checked with each other; the plurality of pressure sensors and the plurality of temperature sensors can be compared with each other and checked with each other to obtain a plurality of corresponding gas density values.

Example eleven:

as shown in fig. 13, a gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6, the intelligent processor 7 and the multi-way joint 9. The air inlet of the valve 4 is connected to the electrical equipment in a sealing way, and the air outlet of the valve 4 is connected with the multi-way joint 9. The valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out through the first lead-out wire sealing member 42 sealed with the first housing 41, so that the design ensures that the valve 4 keeps sealed, and can reliably work for a long time. The gas density relay 1 is arranged on the multi-way joint 9; the pressure regulating mechanism 5 is mounted on a multi-way joint 9. The pressure sensor 2, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent processor 7 are arranged on the gas density relay 1. The pressure sensor 2 and the gas density relay 1 are communicated with the pressure regulating mechanism 5 on the gas path. The valve 4, the pressure regulating mechanism 5, the pressure sensor 2 and the temperature sensor 3 are respectively connected with an intelligent processor 7.

Unlike the first embodiment, the following is: the pressure sensor 2, the temperature sensor 3, the on-line check joint signal sampling unit 6 and the intelligent processor 7 are arranged on the gas density relay 1. The pressure regulating mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, and a heat insulating member 59. The air chamber 57 is externally (or internally) provided with a heating element 58, which, by heating, causes a temperature change and thus a pressure rise or fall. The pressure is regulated by the pressure regulating mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the on-line checking contact signal sampling unit 6, the intelligent processor 7 converts the pressure value and the temperature value of the gas density relay 1 when the contact action is performed into corresponding density values according to the pressure value and the temperature value, and the alarming and/or locking contact action value and/or the return value of the gas density relay are detected, so that the checking work of the gas density relay is completed.

The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent processor 7 controls the heating element 58 of the pressure regulating mechanism 5 to heat, and when the temperature difference between the temperature value T510 in the pressure regulating mechanism 5 and the temperature value T of the temperature sensor 3 reaches a set value, the valve 4 can be closed by the intelligent processor 7, so that the gas density relay is separated from electrical equipment on a gas path; then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the closed gas chamber 57 of the pressure adjusting mechanism 5, so that the gas density relay 1 generates alarm and/or locking contact points to act respectively, transmitting the contact point actions to the intelligent processor 7 through the on-line checking contact point signal sampling unit 6, and detecting the alarm and/or locking contact point action value and/or return value of the gas density relay by the intelligent processor 7 according to the density value when the alarm and/or locking contact points act, thereby completing the checking work of the gas density relay.

Embodiment twelve:

as shown in fig. 14, 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, the lightThe electric coupler OC1 comprises a light emitting diode and a phototriode; the anode of the light emitting diode and the contact P of the gas density relay 1 _J Forming a closed loop in series; 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 processor 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.

The contact P of the gas density relay 1 can be conveniently known by the contact sampling circuit _J Whether open or closed. Specifically, when the contact P _J When the closed circuit is closed, the closed circuit 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 P _J When the light emitting diode is opened, the closed loop is opened, the light emitting diode does not emit light, the phototriode is cut off, and the collector electrode of the phototriode outputs 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 processor 7 is isolated from the contact signal control loop by a photoelectric isolation method, and the contact P is closed in the verification process _J Or contact P in case of air leakage _J Turning off occurs when the collector output of the phototransistor is detected low. Closing contact P during control verification _J Is of a predetermined length so that the contact P is in a non-leaking condition during verification _J The length of the closing state duration is determined, and by monitoring the duration of the received low level, it can be judged whether the contact P occurs in the verification process _J And closing. Therefore, the time can be recorded during verification, and the alarm signal during verification, rather than the alarm signal during air leakage, can be judged by the air density relay 1.

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

Embodiment thirteen:

as shown in fig. 15, 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 optocoupler OC1 and a second optocoupler 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 points of the gas density relay 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 processor 7 and grounded through a resistor R5.

The contact P of the gas density relay 1 can be conveniently known by the contact sampling circuit _J Whether open or closed. Specifically, when the contact P _J When the circuit is closed, the closed circuit is electrified, the first photoelectric coupler OC1 is conducted, the second photoelectric coupler OC2 is cut off, and the emitter (namely the output end out 6) of the phototriode of the first photoelectric coupler OC1 outputs a high level; alternatively, 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 When the circuit is opened, the closed loop is cut off, the first photo coupler OC1 and the second photo coupler OC2 are cut off, and the emitters (namely the output end out 6) of the phototriodes of the first photo coupler OC1 and the second photo coupler OC2 output 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 realize the contact P of the gas density relay 1 _J Is used in conjunction with the intelligent processor 7 to monitor the state of the contact P _J The open state or the close state is correspondingly processed, remote transmission is implemented, the state of the contact signal is known from the background, and the reliability of the power grid is greatly improved.

Fourteen examples:

as shown in fig. 16, the intelligent processor 7 mainly comprises a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent processor protection circuit 74 (U4), a display and output and operation 75 (U5), a data storage 76 (U6), and the like. The processor 71 (U1) contains a crystal oscillator and a filter circuit. The intelligent processor protection circuit 74 (U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 stages and further comprises a step-down module.

The communication mode of the communication module 73 (U3) may be wired: industrial buses such as RS232, RS485, CAN-BUS, optical fiber Ethernet, 4-20mA, hart, IIC, SPI, wire, coaxial cable, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, etc., WIFI, bluetooth, lora, lorawan, zigbee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, sonar, etc. The display and output 75 (U5) may be: the nixie tube, LED, LCD, HMI, the display, the matrix screen, the printer, the fax, the projector, the mobile phone and the like can be formed by one or a plurality of flexible combination. The data store 76 (U6) may be: FLASH, RAM, ROM, hard disk, SD, etc., flash memory card, magnetic tape, punched tape, optical disk, U disk, optical disk, film, etc., may be one kind or a plurality of kinds of flexible combination.

Example fifteen:

as shown in fig. 17, the intelligent processor 7 mainly includes a processor 71 (U1), a power supply 72 (U2), a communication module 73 (U3), an intelligent processor protection circuit 74 (U4), and the like. The processor 71 (U1) contains a crystal oscillator and a filter circuit. The intelligent processor protection circuit 74 (U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 stages and further comprises a step-down module. The pressure sensor 2 passes through an overvoltage protection circuit and an operational amplifier circuit, and then passes through a filter circuit to a processor 71 (U1). In the communication module 73 (U3), the communication chip passes through the surge protection circuit to the communication interface.

Example sixteen:

FIG. 18 is a schematic diagram of a 4-20mA density transmitter circuit on a gas density relay. As shown in FIG. 18, the 4-20Ma type density transmitter mainly comprises a microprocessor (comprising a main controller, a crystal oscillator and a filter circuit), a power supply, a modulation circuit, a current loop, a protection circuit, an analog pressure sensor, an operational amplifier, a temperature sensor, a proportion modulation module, a voltage reduction module and the like. The microprocessor includes crystal oscillator and filter circuit. The protection circuit comprises a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit and the like. The analog pressure sensor passes through the overvoltage protection circuit and the operational amplification circuit, then passes through the filter circuit and then passes through the microprocessor after reaching the modulation circuit, so that the microprocessor can acquire a pressure value and a temperature value, and a density value signal is obtained after calculation and conversion of the microprocessor. The density value signal is passed through a proportional modulation module, a modulation circuit and a current loop to obtain a density value of 4-20 Ma.

In a word, after the analog pressure sensor, the temperature sensor and the micro water sensor pass through the amplifying circuit, the analog pressure sensor, the temperature sensor and the micro water sensor are subjected to A/D conversion to the MCU, and pressure, temperature and water collection is realized. The intelligent processor 7 can be provided with or connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.

Example seventeenth:

fig. 19 is a schematic structural diagram of a gas density monitoring apparatus according to a seventeenth embodiment of the present application. As shown in fig. 19, the gas density monitoring apparatus includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line check joint signal sampling unit 6 and the intelligent processor 7. And the intelligent processor 7 comprises: processor 71 (U1), power supply 72 (U2), communication module 73 (U3), intelligent processor protection circuit 74 (U4), valve controller 77 (U7), execution controller 78 (U8), human-machine interface 79 (U9), pressure adjustment mechanism position detection 511, and the like. The execution controller 78 (U8), which may also be referred to as a control system, may be provided on the intelligent processor 7; or part of the control system is arranged on the pressure regulating mechanism 5, and the two are closely matched and fused together.

Example eighteenth:

fig. 20 is a schematic diagram of a remote gas density relay system according to an eighteenth embodiment. As shown in fig. 20, a plurality of high-voltage electrical equipment with sulfur hexafluoride gas chambers and a plurality of gas density monitoring devices are connected with a background monitoring terminal through a hub and an IEC61850 protocol converter in sequence. Each gas density monitoring device is arranged on high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB (HUB 1, HUB2, … … HUB) through the HUB 0. Each HUB is connected with a group of gas density monitoring devices, such as HUB1 is connected with gas density monitoring devices Z11, Z12 and … … Z1n, HUB2 is connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and HUB m is connected with gas density monitoring devices Zm1, zm2 and … … Zmn, wherein m and n are natural numbers.

The background monitoring terminal comprises: 1) Background software platform: based on Windows, linux and others, or VxWorks, android, unix, UCos, freeRTOS, RTX, embOS, macOS. 2) Background software key business module: such as rights management, device management, data storage in queries, etc., as well as user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data collection, data parsing, recording conditions, exception handling, etc. 3) Interface configuration: such as Form interfaces, web interfaces, configuration interfaces, etc.

Example nineteenth:

fig. 21 is a schematic diagram of the architecture of a remote gas density relay system according to nineteenth embodiment. The embodiment eighteen adds a network switch Gateway, a comprehensive application Server, a protocol converter/an on-line monitoring intelligent unit ProC. In this embodiment, the background monitoring terminal PC is connected to two comprehensive application servers Server1 and Server2 through a Gateway of the network switch, and the two comprehensive application servers Server1 and Server2 communicate with a plurality of protocol converters/on-line monitoring intelligent units ProC (ProC 1, proC2, … … ProCn) through a site control layer a network and B network, and the protocol converters/on-line monitoring intelligent units ProC communicate with a plurality of HUBs HUB (HUB 1, HUB2, … … HUB m) through an R5485 network. Each HUB is connected with a group of gas density monitoring devices, such as HUB1 is connected with gas density monitoring devices Z11, Z12 and … … Z1n, HUB2 is connected with gas density monitoring devices Z21, Z22 and … … Z2n and … …, and HUB m is connected with gas density monitoring devices Zm1, zm2 and … … Zmn, wherein m and n are natural numbers.

Example twenty:

fig. 22 is a schematic diagram of a remote gas density relay system according to a twenty-first embodiment. The embodiment is a schematic architecture diagram of a wireless transmission mode, in which a virtual frame indicates that a wireless module Wn and a gas density monitoring device Zn can be integrated or separated, and the specific scheme can be flexible.

The plurality of comprehensive application servers Server1, server2 and … … Server n are in Wireless communication with each gas density monitoring device through cloud Cluod, wireless Gateway (Wireless Gateway) and Wireless modules of each gas density monitoring device. Wherein n is a natural number.

Besides checking the gas density relay on line, the system can monitor the temperature, pressure, density, micro water and other physical quantities of SF6 gas in the electrical equipment such as a breaker, a GIS and the like and the change trend of the SF6 gas in real time, has a communication interface, uploads data to a background monitoring terminal, realizes the on-line monitoring function of the SF6 gas density, the micro water and other physical quantities of the electrical equipment such as the breaker, the GIS and the like, can flexibly set an alarm limit, inquires historical data on site, accurately analyzes and judges the gas leakage trend and the gas leakage rate of the equipment, discovers abnormal conditions of the equipment in advance, thereby ensuring the safe operation of the electrical equipment and the whole system of a transformer substation, and truly realizes the on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station. Configuration principle: the system is built by adopting a bus type layered distributed structure, and the three-layer system structure requirement of the intelligent substation is met: the whole system adopts IEC61850 standard power communication protocol, namely a process layer (a sensor layer, namely a gas density relay), a spacer layer (a data transmission and acquisition processing layer) and a station control layer (a monitoring host, a database server and the like). The background monitoring terminal is responsible for collecting monitoring data, comprehensively analyzing, diagnosing faults, storing and transmitting standardized data, and has the functions of real-time data display, change trend analysis, historical data inquiry, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electric equipment without going to the site, can check and detect a gas density relay on line, can provide firm basis for state maintenance of SF6 electric equipment through big data analysis and trend analysis by expert analysis software, meets the requirements of power grid automation and equipment state maintenance, plays an important role in improving the safe operation and operation management level of a power grid system, developing expected diagnosis and trend analysis and reducing unplanned power failure maintenance.

The verification accuracy of the gas density relay can be related to the power industry or national standard. At different temperatures, the verification requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performance specifications in DL/T259 sulfur hexafluoride gas density relay verification regulations, and the accuracy requirements corresponding to each temperature value, namely, the error judgment requirements, can be different according to the standards or can be specified separately. The comparison and judgment of different annual contemporaneous (or same season) can be carried out. For example, the result of the 5 th month in 2021 may be directly compared with the result of the 5 th month in 2019 and the 5 th month in 2020, and the trend analysis may be performed to determine. The verification can be carried out when the verification is needed, the movable design can be carried out, namely the operation of the substation A can be carried out for a period of time, the operation of the substation B can be carried out for a period of time after the task is completed, and the operation of the substation C can be carried out after the task is completed.

The gas density relay has the verification accuracy reaching the level of 0.25 at 20 ℃ and reaching the level of 0.625 at high temperature or low temperature, and meets the requirements on the verification accuracy and the related specifications from the aspects of economy and metering.

The gas density monitoring device related in the remote gas density relay system and the verification method thereof can refer to a gas density relay with integral components and a gas density monitoring device with integral components.

Remote gas density relay system: when the gas density relay is checked at high temperature, low temperature, normal temperature and 20 ℃ ambient temperature, the error judgment requirements of the system can be different, and the system can be implemented according to the temperature requirements and the related standards; the comparison of the error performance of the gas density relay can be performed in different time periods according to different temperatures of the gas density relay. I.e., at different times, in the same temperature range, a determination is made as to the performance of the gas density relay. The comparison of each period of the history and the comparison of the history and the current. Physical examination of the gas density relay system is also possible. When necessary, the gas density relay can be checked at any time; a determination is made as to whether the density value of the monitored electrical device is normal with the gas density relay. The density value, the gas density relay, the pressure sensor and the temperature sensor of the electrical equipment can be judged, analyzed and compared normally and abnormally, so that the states of the gas density monitoring, the system, the gas density relay and the like of the electrical equipment 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 can be detected or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the insulating property of the gas density relay is also detected, or detected and judged.

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. A remote gas density relay system, comprising:

the background monitoring terminal is in remote communication with at least one gas density monitoring device through communication equipment; the communication equipment is used for realizing data transmission of the background monitoring terminal and the gas density monitoring device; the gas density monitoring device comprises a gas density relay, a gas density detection sensor, a pressure regulating mechanism, a valve, an on-line check joint signal sampling unit and a circuit control part; wherein, the liquid crystal display device comprises a liquid crystal display device,

the pressure regulating mechanism is communicated with the gas path of the gas density relay and is configured to enable the gas density relay to generate contact signal action by regulating the pressure rise and fall of the gas path of the gas density relay when the gas density relay is verified;

the circuit control part comprises a power supply for supplying power to each electric equipment and an intelligent processor; the intelligent processor is respectively connected with the gas density detection sensor, the pressure regulating mechanism, the valve, the on-line check joint signal sampling unit and the communication equipment, and is configured to directly control the closing or opening of the valve or receive a remote control instruction of the background monitoring terminal to control the closing or opening of the valve, so as to complete the control of the pressure regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition, detect the joint signal action value and/or the joint signal return value of the gas density relay, and send test data and/or check results to the background monitoring terminal through the communication equipment in real time;

The pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element are 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 process may be performed,

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; 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 process may be performed,

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 process may be performed,

The pressure regulating mechanism is an air bag with one end connected with the driving part, the air bag is subjected to volume change under the driving of the driving part, and the air bag is communicated with the gas density relay; or alternatively, the process may be performed,

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

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 process may be performed,

the pressure regulating mechanism is a compressor; or alternatively, the process may be performed,

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.

2. A remote gas density relay system according to claim 1, wherein: the background monitoring terminal comprises a storage device which is used for storing data and/or information transmitted to the background monitoring terminal through the communication equipment.

3. A remote gas density relay system according to claim 1, wherein: the background monitoring terminal comprises a display interface for man-machine interaction, and is used for displaying current check data and/or information in real time and/or supporting data input.

4. A remote gas density relay system according to claim 1, wherein: the communication equipment is arranged at the shell of the gas density relay, or at the shell of the circuit control part, or is of an integrated structure with the intelligent processor.

5. A remote gas density relay system according to claim 1, wherein: the communication mode of the communication equipment is a wired communication mode or a wireless communication mode.

6. A remote gas density relay system according to claim 1, wherein: the gas density relay comprises a bimetallic strip-compensated gas density relay, a gas-compensated gas density relay, a bimetallic strip and a gas-compensated mixed 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.

7. A remote gas density relay system according to claim 1, wherein: the gas density relay includes: a housing, a base, a pressure detector, a temperature compensation element, and a signal generator disposed in the housing;

the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a barden tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.

8. A remote gas density relay system according to claim 7, wherein: at least one temperature sensor is disposed near or on or integrated into the temperature compensation element of the gas density relay.

9. A remote gas density relay system according to claim 8, wherein: at least one temperature sensor is disposed at an end of the pressure detector of the gas density relay adjacent to the temperature compensation element.

10. A remote gas density relay system according to claim 8, wherein: and an outgoing line sealing piece is arranged in the shell of the gas density relay, and a connecting wire of the temperature sensor is connected with the intelligent processor through the outgoing line sealing piece.

11. A remote gas density relay system according to claim 7, wherein: the gas density relay further comprises a heat insulating piece, wherein the heat insulating piece is arranged between the shell of the gas density relay and the shell of the circuit control part; alternatively, the heat insulator is disposed at the power supply.

12. A remote gas density relay system according to claim 7, wherein: the power supply is located remotely from the temperature sensor and the temperature compensation element, wherein the remote refers to: in a normal working state, the heating of the power supply does not affect the temperature sensor and the temperature compensation element.

13. A remote gas density relay system according to claim 7, wherein: the gas density relay further comprises a display mechanism, wherein the display mechanism comprises a machine core, a pointer and a dial, and the machine core is fixed on the base; the other end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display a gas density value; or alternatively, the process may be performed,

The display mechanism comprises a digital device or a liquid crystal device with indication display.

14. A remote gas density relay system according to claim 1, wherein: the gas density detection sensor is arranged on the gas density relay; alternatively, the pressure regulating mechanism is arranged on the gas density relay; or the gas density detection sensor, the on-line check joint signal sampling unit and the intelligent processor are arranged on the gas density relay.

15. A remote gas density relay system according to claim 14, wherein: the gas density relay and the gas density detection sensor are of an integrated structure; or the gas density relay and the gas density detection sensor are remote-transmission type gas density relay with integrated structures.

16. A remote gas density relay system according to claim 1, wherein: the gas density detection sensor is of an integrated structure; or the gas density detection sensor is a gas density transmitter with an integrated structure.

17. A remote gas density relay system according to claim 16, wherein: the on-line checking joint signal sampling unit and the intelligent processor are arranged on the gas density transmitter.

18. A remote gas density relay system according to claim 1, wherein: the probe of the pressure sensor is arranged on the gas circuit of the gas density relay;

the probe of the temperature sensor is arranged on the gas path or outside the gas path of the gas density relay, or inside the gas density relay shell, or outside the gas density relay shell.

19. A remote gas density relay system according to claim 1, wherein: the pressure sensor is arranged in the shell of the gas density relay, or in the shell of the circuit control part, or on the pressure regulating mechanism, or on the valve.

20. A remote gas density relay system according to claim 1, wherein: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.

21. A remote gas density relay system according to claim 1, wherein: the valve communicates with the electrical device directly or through a connection.

22. A remote gas density relay system according to claim 1, wherein: the valve is an electric valve and/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.

23. A remote gas density relay system according to claim 1, wherein: the valve is closed or opened in a hose bending or flattening mode.

24. A remote gas density relay system according to claim 1, wherein: the valve is sealed within a cavity or housing.

25. A remote gas density relay system according to claim 1, wherein: the valve and the pressure regulating mechanism are sealed within a cavity or housing.

26. A remote gas density relay system according to claim 1, wherein: pressure sensors are respectively arranged on two sides of the gas path of the valve; or alternatively, the process may be performed,

pressure or density detectors are respectively arranged on two sides of the gas path of the valve.

27. A remote gas density relay system according to claim 1, wherein: the pressure regulating mechanism is sealed within a cavity or housing.

28. A remote gas density relay system according to claim 1, wherein: the on-line checking joint signal sampling unit and the intelligent processor are arranged together.

29. A remote gas density relay system according to claim 28, wherein: the on-line check joint signal sampling unit and the intelligent processor are sealed in a cavity or a shell.

30. A remote gas density relay system according to claim 1, wherein: the gas density relay comprises a gas density relay, an intelligent processor and an on-line verification contact signal sampling unit, wherein the contact of the gas density relay is a normally open type density relay, the on-line verification contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, the first connecting circuit is connected with the contact of the gas density relay and a contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay and the intelligent processor; in a non-verification state, the second connection circuit is opened or isolated, and the first connection 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 with the intelligent processor; or alternatively, the process may be performed,

31. A remote gas density relay system according to claim 30, 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;

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 is connected with the intelligent processor through the normally-open contact.

32. A remote gas density relay system according to claim 1, wherein: the intelligent processor acquires a gas density value acquired by the gas density detection sensor; or the intelligent processor acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density monitoring device.

33. A remote gas density relay system according to claim 1, wherein: the intelligent processor acquires a gas density value acquired by the gas density detection sensor when the gas density relay generates contact signal action or is switched, so that the on-line verification of the gas density relay is completed; or alternatively, the process may be performed,

34. A remote gas density relay system according to claim 1, wherein: the intelligent processor is based on an embedded algorithm and a control program of the embedded system of the microprocessor, and automatically controls the whole verification process, and comprises all peripherals, logic and input and output.

35. A remote gas density relay system according to claim 1, wherein: the intelligent processor 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.

36. A remote gas density relay system according to claim 35, wherein: the electrical interface is provided with an electrical interface protection circuit that prevents the interface from being damaged by a user misconnection and/or prevents electromagnetic interference.

37. A remote gas density relay system according to claim 1, wherein: the intelligent processor is also provided with a clock, and the clock is configured to be used for periodically setting the verification time of the gas density relay, recording the test time or recording the event time.

38. A remote gas density relay system according to claim 1, wherein: the intelligent processor is controlled by field control and/or by the background monitoring terminal.

39. A remote gas density relay system according to claim 1, wherein: the remote gas density relay system further comprises a shielding piece which can play a role in shielding an electric field and/or a magnetic field, and the shielding piece is arranged in or outside the shell of the circuit control part; or alternatively, the process may be performed,

The shield is disposed on the pressure sensor.

40. A remote gas density relay system according to claim 1, wherein: and the intelligent processor compares the environmental temperature value with the temperature value acquired by the temperature sensor to finish the verification of the temperature sensor.

41. A remote gas density relay system according to claim 1, wherein: the gas density relay is provided with a comparison density value output signal which is connected with the intelligent processor; alternatively, the gas density relay has a comparison pressure value output signal that is coupled to the intelligent processor.

42. The remote gas density relay system of claim 41, wherein: when the gas density relay outputs a comparison density value output signal, the intelligent processor collects the current gas density value, performs comparison, completes the comparison density value verification of the gas density relay, judges comparison results of the intelligent processor or/and a background monitoring terminal, and sends out an abnormality prompt if the errors are out of tolerance; or alternatively, the process may be performed,

43. A remote gas density relay system according to claim 1, wherein: comprises at least two gas density detection sensors, wherein each gas density detection sensor comprises a pressure sensor and a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

44. A remote gas density relay system according to claim 1, wherein: the gas density detection sensor comprises at least two pressure sensors, pressure values acquired by the pressure sensors are compared, and mutual verification of the pressure sensors is completed.

45. A remote gas density relay system according to claim 1, wherein: the gas density detection sensor comprises at least two temperature sensors, and temperature values acquired by the temperature sensors are compared to finish mutual verification of the temperature sensors.

46. A remote gas density relay system according to claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor;

the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are arranged and combined randomly, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or alternatively, the process may be performed,

the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are traversed through all the arrangement combinations, each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or alternatively, the process may be performed,

Comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with a comparison density value output signal output by the gas density relay to finish the mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or alternatively, the process may be performed,

and comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.

47. A remote gas density relay system according to claim 1, wherein: after the gas density relay is verified, the intelligent processor automatically generates a verification report of the gas density relay, if the gas density relay is abnormal, an alarm is sent out, and the report is uploaded to a remote end or sent to a designated receiver.

48. A remote gas density relay system according to claim 1, wherein: the gas density relay further comprises a multi-way joint, and the gas density relay, the valve and the pressure regulating mechanism are arranged on the multi-way joint; alternatively, the intelligent processor is disposed on the multi-way joint.

49. The remote gas density relay system of claim 48, wherein: the gas circuit of the gas density relay is connected with the first interface of the multi-way joint; the gas circuit of the pressure regulating mechanism is connected with the second interface of the multi-way connector, and the first interface is communicated with the second interface, so that the gas circuit of the pressure regulating mechanism is communicated with the gas circuit of the gas density relay; the gas outlet of the valve is communicated with a third interface of the multi-way joint, and the third interface is communicated with the first interface, so that the gas outlet of the valve is communicated with a gas path of the pressure regulating mechanism and/or a gas path of the gas density relay.

50. A remote gas density relay system according to claim 1, wherein: the gas density relay, the valve and the pressure regulating mechanism are connected together through connecting pipes.

51. The remote gas density relay system of claim 50, wherein: the gas circuit of the pressure regulating mechanism is communicated with the gas circuit of the gas density relay through a first connecting pipe; the gas outlet of the valve is directly communicated with the gas path of the gas density relay through a second connecting pipe, or the gas outlet of the valve is connected with the gas path of the pressure regulating mechanism through a second connecting pipe, so that the valve is communicated with the gas path of the gas density relay.

52. A remote gas density relay system according to claim 1, wherein: the gas density relay further comprises a self-sealing valve mounted between the electrical device and the valve; alternatively, the valve is mounted between an electrical device and the self-sealing valve.

53. A remote gas density relay system according to claim 1, wherein: the intelligent processor is characterized by further comprising a micro water sensor which is respectively connected with the gas density relay and the intelligent processor, and/or a decomposition product sensor which is respectively connected with the gas density relay and the intelligent processor.

54. A remote gas density relay system according to claim 1, wherein: at least two gas density monitoring devices are connected with the background monitoring terminal through a hub and a protocol converter in sequence; wherein, each gas density monitoring device is arranged on corresponding electrical equipment respectively.

55. A method of calibrating a remote gas density relay system of claim 1, comprising:

closing the valve by the intelligent processor;

56. A method of calibrating a gas density relay system in accordance with claim 55 comprising:

Closing the valve by the intelligent processor;