CN110426312A

CN110426312A - On-line sampling check-up gas density electrical relay with defencive function

Info

Publication number: CN110426312A
Application number: CN201910830153.1A
Authority: CN
Inventors: 金海勇; 夏铁新; 黄小泵; 郭正操; 常敏; 王乐乐
Original assignee: Shanghai Leyan Electric Co Ltd
Current assignee: Shanghai Leyan Electric Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2019-11-08
Anticipated expiration: 2039-09-04
Also published as: CN110426312B

Abstract

The application provides a kind of on-line sampling check-up gas density electrical relay with defencive function, including gas density relay ontology, gas density detection sensor, thermoregulation mechanism, on-line testing contact point signal sampling unit and intelligence control unit.On-line testing contact point signal sampling unit includes the first connection circuit and the second connection circuit, the contact and contact point signal control loop of first connection circuit connection gas density relay ontology, the contact and intelligence control unit of the second connection circuit connection gas density relay ontology；Non- verification state, the second connection circuit disconnect, the first connection closing of circuit；Verification state, first connection circuit disconnects, connection the second connection circuit, the contact of gas density relay ontology is connected with intelligence control unit, it is ensured that when inspection, contact action signal is not uploaded, the safe operation of power grid is not influenced, it realizes the non-maintaining of gas density relay simultaneously, substantially increases benefit, improve the reliable and secure operation of power grid.

Description

Online sampling check gas density relay with protection function

Technical Field

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

Background

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

At present, SF₆(sulfur hexafluoride) electrical equipment is widely applied to the power sector and industrial and mining enterprises, and rapid development of the power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and SF (sulfur hexafluoride) is₆Electrical equipment is used more and more. SF₆The gas has functions of arc extinction and insulation in high-voltage electrical equipment, and SF in the high-voltage electrical equipment₆If the density of the gas is reduced and the micro water content exceeds the standard, the SF is seriously influenced₆Safe operation of high-voltage electrical equipment: 1) SF₆The reduction of the gas density to a certain extent will result in a loss of insulation and arc extinguishing properties. 2) In the presence of some metal species, SF₆The gas is heated at 200 deg.C toThe upper temperature can generate hydrolysis reaction with water to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture can form condensed water, so that the surface insulation strength of the insulation part is obviously reduced, and even flashover is caused, thereby causing serious harm. Therefore, the grid operating regulations impose that the SF must be applied before and during the operation of the plant₆The density and water content of the gas are periodically measured.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the SF is subjected to₆The online monitoring of the gas density and the micro-water content state of the electrical equipment has important practical significance. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF₆In the case of gas-insulated equipment, if the gas density is reduced (such as caused by leakage), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. Currently on-line monitoring of SF₆Gas density values in high voltage electrical equipment have become very common and gas density monitoring system (gas density relay) applications have been developed vigorously for this purpose. Whereas current gas density monitoring systems (gas density relays) are basically: 1) using remote transmission of SF₆The gas density relay realizes the collection and uploading of density, pressure and temperature, and realizes the online monitoring of gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. SF₆The gas density relay is the core and key component. However, due to the severe environment of the high-voltage substation in field operation, especially the strong electromagnetic interference, in the currently used gas density monitoring system (gas density relay), the remote transmitting SF thereof₆The gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay has a group,Two or three groups of mechanical contacts can transmit information to a target equipment terminal through a contact connecting circuit in time when the pressure reaches the state of alarming, locking or overpressure, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be transmitted to target equipment (generally a computer terminal) in time to realize online monitoring.

The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. The power supply company, the power plant and the large-scale factory and mining enterprise need to be equipped with testers, equipment vehicles and high-value SF for completing the field check and detection work of the gas density relay₆A gas. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the working efficiency is greatly improved, and the cost is reduced.

Disclosure of Invention

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

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

the application provides in a first aspect an online sampling check gas density relay with protect function, includes: the device comprises a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;

the temperature adjusting mechanism is an adjustable temperature adjusting mechanism and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal action;

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

the online 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 body and the contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay body and the intelligent control unit; in a non-checking state, the contact is a normally open density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the online checking contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit and connects the contact of the gas density relay body with the intelligent control unit; or, in a non-verification state, the contact is a normally closed density relay, the second connection circuit is disconnected or isolated, and the first connection circuit is closed; in a checking state, the online checking contact signal sampling unit closes the contact signal control loop, cuts off the connection between the contact of the gas density relay body and the contact signal control loop, communicates the second connection circuit, and connects the contact of the gas density relay body with the intelligent control unit;

the intelligent control unit is respectively connected with the gas density detection sensor, the temperature adjusting mechanism and the online check contact signal sampling unit, and is configured to complete control of the temperature adjusting mechanism, pressure value acquisition, temperature value acquisition and/or gas density value acquisition, and detection of a contact signal action value and/or a contact signal return value of the gas density relay body;

wherein the contact signal comprises an alarm, and/or a latch.

In a second aspect, the present application provides a gas density monitoring device with a protection function, including: the device comprises a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;

wherein the contact signal comprises an alarm, and/or a latch.

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

in a non-checking 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; under the check-up state, normally closed contact disconnection, normally open contact is closed, the contact of gas density relay body passes through normally open contact with the intelligence is controlled the unit and is connected.

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

Preferably, the online 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 light emitting diode is connected with the contact of the gas density relay body in series to form a closed loop; the emitting electrode of the phototriode is grounded; the collector of the phototriode is connected with the intelligent control unit, and the collector of the phototriode is also connected with a power supply through the resistor;

when the contact is closed, the closed loop is electrified, the light-emitting diode emits light, the phototriode is conducted by the light, and the collector of the phototriode outputs a low level;

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

Preferably, the online 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 diode of the first photoelectric coupler and the light emitting diode of the second photoelectric coupler are respectively connected in parallel through a current limiting resistor, and are connected in series with the contact of the gas density relay body after being connected in parallel to form a closed loop, and the connection directions of the light emitting diodes of the first photoelectric coupler and 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 divider resistor, the emitter of the phototriode of the first photoelectric coupler is connected with the emitter of the phototriode of the second photoelectric coupler to form an output end, and the output end is connected with the intelligent control unit and is grounded through a resistor;

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

when the contact is disconnected, 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 levels.

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

Further, the first zener diode group comprises a first zener diode and a second zener diode which are connected in series, and a cathode of the first zener diode is connected to an anode of the second zener diode; the second voltage stabilizing diode group comprises a third voltage stabilizing diode and a fourth voltage stabilizing diode which are connected in series, and the anode of the third voltage stabilizing diode is connected with the cathode of the fourth voltage stabilizing diode.

Preferably, the online 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, contacts of the first hall current sensor, the second hall current sensor and the gas density relay body are connected in series to form a closed loop, and the contact of the gas density relay body is 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 both connected with the intelligent control unit;

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

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

Preferably, the online verification contact signal sampling unit is provided with a contact sampling circuit, and the contact sampling circuit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;

first silicon controlled rectifier, third silicon controlled rectifier establish ties, and the series connection circuit that second silicon controlled rectifier, fourth silicon controlled rectifier establish ties the back and first silicon controlled rectifier, third silicon controlled rectifier constitute forms the series-parallel closed circuit, the one end of the contact of gas density relay body pass through the circuit with circuit electricity between first silicon controlled rectifier, the third silicon controlled rectifier is connected, the other end pass through the circuit with circuit electricity between second silicon controlled rectifier, the fourth silicon controlled rectifier is connected.

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

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

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

the gas density detection sensor, online check-up contact signal sampling unit with the intelligence is controlled the unit and is set up on the gas density relay body.

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

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

More preferably, online check joint signal sampling unit, the intelligence accuse unit sets up on the gas density transmitter.

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

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

a density detection sensor adopting quartz tuning fork technology.

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

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

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

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

Further, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure sensor with an induction coil in the bawden tube), a resistive pressure sensor (e.g., a pressure sensor with a slide wire resistor in the bawden tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.

More preferably, at least one of said temperature sensors is arranged in the vicinity of, on or integrated in a temperature compensation element of said gas density relay. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay, which is close to the temperature compensation element; the pressure detector is a Badon tube or a corrugated tube, and the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.

Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.

More preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

Preferably, the temperature adjustment mechanism is a heating element; or the temperature regulating mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature regulating mechanism shell; alternatively, the temperature adjustment mechanism comprises a heating element and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism comprises a heating element, a temperature controller and a temperature detector; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors; the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.

Preferably, the online sampling verification gas density relay or gas density monitoring device further includes: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is also connected with the intelligent control unit, the pressure of the gas density relay body is regulated to rise and fall under the control of the intelligent control unit, and then the gas density relay body is matched or/and combined with the temperature regulating mechanism to generate contact signal action; or, the gas density relay or the gas density monitoring device further comprises: the intelligent control unit is connected with the heating device; or, gas density relay or gas density monitoring devices still include air chamber and heating device, the air chamber with the gas density relay body is linked together, the outside or the inside of air chamber are equipped with heating device, the intelligence accuse unit with heating device is connected.

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

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

Preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased.

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

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

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

Preferably, during verification, the pressure adjusting 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.

Preferably, the pressure adjusting mechanism is an air bag having one end connected to a driving member, the air bag is driven by the driving member to generate a volume change, and the air bag is communicated with the gas density relay body.

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

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

More preferably, the temperature adjustment mechanism is controlled to increase or decrease the temperature by a plurality of stages.

Preferably, the pressure regulating mechanism is a purge valve.

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

More preferably, the air release valve is an electromagnetic valve or an electric valve, or other air release valves realized by electric or pneumatic means.

Preferably, the pressure regulating mechanism is a compressor.

Preferably, the pressure regulating mechanism is a pump.

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

Preferably, the online sampling verification gas density relay or gas density monitoring device further includes: and one end of the valve is provided with a connecting port communicated with the electrical equipment, and the other end of the valve is communicated with the pressure adjusting mechanism and the gas density relay body.

More preferably, the valve is further connected with the intelligent control unit, and the valve is closed or opened under the control of the intelligent control unit.

Preferably, the valve is an electrically operated valve.

Preferably, the valve is a solenoid valve.

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

Preferably, the valve is a piezoelectric valve, or a temperature control valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.

Preferably, the valve is closed or opened in a hose bending or flattening mode.

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

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

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

Preferably, the electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.

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

Preferably, the valve is in communication with the electrical device through an electrical device connection fitting.

Preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay body to satisfy the following conditions:

the online check contact signal sampling unit is provided with at least two groups of independent sampling contacts, can automatically check at least two contacts simultaneously, and continuously measures without replacing the contacts or reselecting the contacts; wherein, the contact includes, but is not limited to one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.

Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value or the switching value of the contact signal action value of the gas density relay body to be not lower than 24V, namely, during verification, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.

Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and the online monitoring of the gas density relay is completed.

More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in the whole temperature range to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.

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

the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's online check-up.

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

the gas density relay body has the pressure value output signal of comparing, should compare pressure value output signal with the intelligence is controlled the unit and is connected.

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

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

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

More preferably, the gas density relay (or the gas density monitoring device) supports the input of basic information of the gas density relay, wherein the basic information comprises one or more of, but is not limited to, a factory number, a precision requirement, a rated parameter, a manufacturing plant and an operation position.

Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the verification result in a long distance.

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

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

Further, the wireless communication mode includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar.

Preferably, a clock is further arranged on the intelligent control unit, and the clock is configured to be used for regularly setting the verification time of the gas density relay or recording the test time.

Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.

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

and completing the online verification of the gas density relay according to the set verification time of the gas density relay.

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

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

the gas path of the pressure regulating mechanism is connected with a second joint of the multi-way joint, and the first joint is communicated with the second joint so as to communicate the gas path of the pressure regulating mechanism with the gas density relay body; the other end 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 other end of the valve is communicated with the pressure adjusting mechanism and/or the gas density relay body.

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

Preferably, the online sampling and checking gas density relay with the protection function further comprises a self-sealing valve, and the self-sealing valve is installed between the electrical equipment and the valve; alternatively, the valve is mounted between the electrical device and the self-sealing valve.

Preferably, the online sampling and checking gas density relay with the protection function further comprises a gas supplementing interface.

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

Preferably, the online sampling verification gas density relay with protection function further includes: and the display interface is used for man-machine interaction and is connected with the intelligent control unit to display the current verification data in real time or/and support data input.

Preferably, the online sampling verification gas density relay with protection function further includes: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.

More preferably, the online sampling verification gas density relay with protection function further includes: gas circulation mechanism, gas circulation mechanism respectively with the gas density relay body with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element.

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

Preferably, the online sampling verification gas density relay with protection function further includes: and the decomposition substance sensor is respectively connected with the gas density relay body and the intelligent control unit.

Preferably, the online sampling and checking gas density relay with the protection function further comprises a camera for monitoring.

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

Preferably, the online verification of the gas density relay is completed by at least two gas density relay bodies, at least two multi-way connectors, at least two temperature adjusting mechanisms, at least two online verification contact signal sampling units, an intelligent control unit and a gas density detection sensor; or,

the online calibration method comprises the following steps that at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, at least two intelligent control units and a gas density detection sensor are used for completing online calibration of the gas density relay; or,

at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two on-line checking contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are used for completing the on-line checking of the gas density relay.

The third aspect of the present application provides a method for verifying a gas density relay, including:

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

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

the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism through the intelligent control unit, and then the temperature of a temperature compensation element of the gas density relay is increased, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and finishes checking work of the contact signal action value of the gas density relay;

and after all the contact signal verification work is finished, the intelligent control unit turns off the heating element of the temperature adjusting mechanism.

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

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

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

the intelligent control unit is used for controlling the temperature adjusting mechanism to reduce the temperature of the gas density relay, so that the temperature of a temperature compensation element of the gas density relay is reduced, the contact point resetting of the gas density relay is carried out, the contact point resetting is transmitted to the intelligent control unit through the online checking contact point signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact point is reset, or directly obtains the gas density value, a contact point signal return value of the gas density relay is detected, and the checking work of the contact point signal return value of the gas density relay is completed;

after all contact signal check-up work is accomplished, the intelligence is controlled the heating element that the unit shut off temperature regulation mechanism to adjust on-line check-up contact signal sampling unit to operating condition, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal.

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

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

closing the valve through an intelligent control unit;

the pressure adjusting mechanism is driven by the intelligent control unit, so that the gas pressure is slowly reduced, the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism by the intelligent control unit, the temperature of a temperature compensation element of the gas density relay is increased, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;

after all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the heating element that the unit shut off temperature regulation mechanism.

closing the valve through an intelligent control unit;

the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism through the intelligent control unit, the temperature of a temperature compensation element of the gas density relay is increased, the pressure adjusting mechanism is driven through the intelligent control unit, the gas pressure is slowly reduced, the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact acts, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the checking work of the contact signal action value of the gas density relay is completed;

the temperature of the gas density relay is reduced by controlling the temperature adjusting mechanism through the intelligent control unit, so that the temperature of a temperature compensation element of the gas density relay is reduced, the pressure adjusting mechanism is driven by the intelligent control unit, the gas pressure is slowly increased, the gas density relay is subjected to contact resetting, the contact resetting is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset, or directly obtains the gas density value, a contact signal return value of the gas density relay is detected, and the checking work of the contact signal return value of the gas density relay is completed;

after all contact signal check-up work accomplished, the unit is controlled to the intelligence and the valve is opened to and the unit shutoff temperature adjustment mechanism's heating element is controlled to the intelligence, and will adjust to operating condition on-line check-up contact signal sampling unit, the normal operating condition of operation is resumed to the control circuit of gas density relay's contact signal.

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

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

after the temperature or the pressure of the air chamber is reduced to be proper, the intelligent control unit controls the temperature adjusting mechanism to enable the temperature of the gas density relay to rise, and then the temperature of a temperature compensation element of the density relay rises, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the online checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact acts, or directly obtains the gas density value, detects a contact signal action value of the gas density relay, and completes checking work of the contact signal action value of the gas density relay;

after all contact signal check-up work is accomplished, the intelligence is controlled the unit and is opened the valve to and the intelligence is controlled the unit and is shut off temperature regulation mechanism.

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

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

Preferably, after the gas density relay is checked, if the gas density relay is abnormal, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.

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

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

More preferably, in the verification method, at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online verification contact signal sampling units, an intelligent control unit and a gas density detection sensor are used for completing online verification of the gas density relay; or, the online calibration of the gas density relay is completed by at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, at least two intelligent control units and one gas density detection sensor; or,

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

the application provides an online sampling and checking gas density relay with a protection function and a checking method thereof, which are used for high-voltage electrical equipment and comprise a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit. The online checking contact signal sampling unit is relatively isolated from a contact signal of the gas density relay body on a circuit in a non-checking state; when the check-up state, cut off contact signal control circuit, ensure that the contact action signal of gas density relay body can not upload, can not influence the safe operation of electric wire netting, will simultaneously the contact of gas density relay body with the intelligence is controlled the unit and is connected, monitors the state of the contact of gas density relay body, has ensured the safety of intelligence accuse unit when the check-up.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

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

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

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

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

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

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

fig. 7 is a schematic diagram of another control circuit in accordance with a preferred embodiment of the present invention.

Detailed Description

The invention provides an online sampling and checking gas density relay with a protection function and a checking method thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and taking examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The first embodiment is as follows:

fig. 1 is a schematic diagram of a control circuit of an online sampling and checking gas density relay with a protection function for high-voltage electrical equipment according to an embodiment of the present invention. As shown in fig. 1, an online sampling and checking gas density relay with protection function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a temperature adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7 and a pressure adjusting mechanism 8. One end of the valve 4 is provided with an interface communicated with electrical equipment, and the other end of the valve 4 is communicated with the gas density relay body 1; the temperature adjusting mechanism 5 is arranged opposite to the gas density relay 1, and the temperature sensor 3 is arranged in the shell of the density relay 1. Specifically, the temperature adjustment mechanism 5 is provided outside the density relay body 1 (or the temperature adjustment mechanism 5 is provided in the housing of the gas density relay body 1). The temperature adjusting mechanism 5 is configured to adjust the temperature rise and fall of the temperature compensation element of the gas density relay body 1, so that the gas density relay body 1 generates contact action; the gas path of the pressure regulating mechanism 8 is communicated with the gas density relay body 1; the pressure adjusting mechanism 8 is configured to adjust the pressure rise and fall of the gas density relay body 1, and further cooperate with or/and combine with the temperature adjusting mechanism 5 to enable the gas density relay body 1 to generate contact action; the online check contact signal sampling unit 6 is respectively connected with the gas density relay body 1 and the intelligent control unit 7; the intelligence control unit 7, still respectively with pressure sensor 2 temperature sensor 3 temperature regulation mechanism 5 pressure regulation mechanism 8 valve 4 with online check contact signal sampling unit 6 is connected, is configured to control closing or opening of valve 4 accomplishes temperature regulation mechanism 5's control is accomplished pressure regulation mechanism 8's control, pressure value collection and temperature value collection and/or gas density value collection, and detect gas density relay body 1's contact signal action value and/or contact signal return value. Wherein the contact signal comprises an alarm, and/or a latch.

The online check joint signal sampling unit 6 is provided with a protection circuit, and the protection circuit comprises a first relay J1 and a second relay J2. The first relay J1 is provided with normally closed contacts J11 and J12, and the normally closed contacts J11 and J12 are connected in series in the contact signal control circuit; the second relay J2 is provided with a normally open contact J21 and J22, the normally open contacts J21 and J22 being connected at a contact P of the gas density relay body 1_JThe above step (1); the first relay J1 and the second relay J2 may be integrated into a single unit, i.e., a relay having normally open and normally closed contacts. In the non-verified state, the contact P_JThe normally closed contacts J11 and J12 are closed and the normally open contacts J21 and J22 are open for a normally open density relay that monitors the contact P in real time_JThe output state of (1); 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 body 1 is closed_JThe intelligent control unit 7 is connected with the normally open contacts J21 and J22.

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

Furthermore, the pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and the like. The temperature sensor 3 of the temperature acquisition T may be: various temperature sensing elements such as temperature sensors and temperature transmitters. The valve 4 may be: solenoid valves, electric valves, pneumatic valves, ball valves, needle valves, regulating valves, shut-off valves, etc. can open and close the gas circuit and even the elements controlling the flow. Semi-automatic may also be a manual valve. The temperature adjusting mechanism 5 is a heating element; or the temperature regulating mechanism mainly comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector, a temperature regulating mechanism shell and the like; or the temperature adjusting mechanism mainly comprises a heating element and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power adjuster and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a heating power regulator and a constant temperature controller; or the temperature adjusting mechanism mainly comprises a heating element, a controller, a temperature detector and the like; or, the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or the temperature adjusting mechanism is a micro constant temperature box; the heating element comprises but is not limited to a silicon rubber heater, a resistance wire, an electric heating belt, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor; the number of the heating elements is at least one; the controller includes, but is not limited to, one of a PID controller, a PID and fuzzy controller combined controller, a variable frequency controller, and a PLC controller. The pressure adjusting mechanism 8 may be: electric regulating piston, electric regulating cylinder, booster pump, gas cylinder pressurization, valve, electromagnetic valve and flow controller. Semi-automatic pressure adjustment mechanisms that can also be adjusted manually.

The working principle is as follows:

the intelligent control unit 7 monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P₂₀(i.e., gas density value). When the gas density relay body 1 needs to be checked, if the gas density value P is detected at the moment₂₀Not less than set safety check density value P_SAnd the intelligent control unit 7 controls the valve 4 to be closed, so that the gas density relay body 1 is isolated from the electrical equipment on a gas path.

Next, the intelligent control unit 7 controls to open the contact signal control circuit of the gas density relay body 1, that is, the normally closed contacts J11 and J12 of the first relay J1 of the online verification contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment is not affected when the gas density relay body 1 is verified online, and an alarm signal is not mistakenly sent or the control circuit is locked when the verification is performed. Since the gas density value P is already carried out before the start of the calibration₂₀Not less than set safety check density value P_SThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. At the same time, is communicated through an intelligent control unit 7The contact sampling circuit of the contact of the gas density relay body 1, namely the normally open contacts J21 and J22 of the second relay J2 of the on-line verification contact signal sampling unit 6 are closed, and at the moment, the contact P of the gas density relay body 1 is closed_JThe smart control unit 7 is connected through the normally open contacts J21 and J22 of the second relay J2.

Then, the intelligent control unit 7 controls the driving part 52 of the pressure adjusting mechanism 8 (which can be realized by mainly using a motor and a gear, and has various and flexible modes), and then adjusts the pressure adjusting mechanism 8 to have a volume change, so that the pressure of the gas density relay body 1 gradually decreases, and after the pressure decreases to a target pressure value, the operation can be stopped. Then, the temperature of the gas density relay body 1 is increased by operating or controlling the temperature adjusting mechanism 5 by the intelligent control unit 7, and the temperature of the temperature compensating element of the gas density relay body 1 is increased, so that the gas density relay body 1 generates a contact action, the contact action is uploaded to the intelligent control unit 7 through the second relay J2 of the online checking contact signal sampling unit 6, and the intelligent control unit 7 converts the pressure value P and the temperature value T measured when the contact is acted into the pressure value P corresponding to 20 ℃ according to the gas characteristics₂₀(density value), the contact action value P of the gas density relay can be detected_D20. Treat the whole backs that detect of the contact signal action value of the warning of gas density relay body 1 and/or blocking signal, the unit 7 is controlled to the operation or the control of temperature adjustment mechanism 5 to the rethread intelligence, make the temperature reduction of gas density relay body 1, and then the temperature reduction of the temperature compensation component of density relay, make gas density relay take place the contact and reset, the contact resets and transmits intelligence through online check-up contact signal sampling unit 6 and controls unit 7, the pressure value when intelligence is controlled unit 7 according to the contact resets, the temperature value obtains the gas density value, or directly obtains the gas density value, detect out the contact signal return value of gas density relay, accomplish the check-up work of the contact signal return value of gas density relay. Or, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure adjusting mechanism 8 to adjust the pressure adjusting mechanism 8, so that the pressure of the gas density relay body 1 is gradually increasedThe return value of the alarm and/or latching contact signal of the gas density relay body 1 is tested. In a word, the verification is repeated for multiple times (for example, 2 to 3 times), and then the average value of the verification is calculated, so that the verification work of the gas density relay is completed.

After the verification is completed, the normally open contacts J21 and J22 of the second relay J2 of the online verification contact signal sampling unit 6 are disconnected, and at the moment, the contact P of the gas density relay body 1 is connected_JThe smart control unit 7 is disconnected by opening the normally open contacts J21 and J22 of the second relay J2. The heating element of the temperature adjusting mechanism 5 is turned off through the intelligent control unit 7, and the intelligent control unit 7 controls the valve 4 to be opened, so that the gas density relay body 1 is communicated with the electrical equipment on a gas path. Then, the normally closed contacts J11 and J12 of the first relay J1 of the online check contact signal sampling unit 6 are closed, the contact signal control circuit of the gas density relay body 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Therefore, the online checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.

Example two:

as shown in fig. 2, the online verification 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, and the photo coupler OC1 includes a light emitting diode and a photo transistor; the anode of the light emitting diode and the contact point P of the gas density relay body 1_JAre connected in series to form a closed loop; the emitting electrode of the phototriode is grounded; the collector of phototriode is connected as output out6 of online check contact signal sampling unit 6 intelligent control unit 7, the collector of phototriode still passes through resistance R1 is connected with the power.

By the contact sampling circuit, the contact P of the gas density relay body 1 can be known conveniently_JWhether open or closed. Specifically, when the contact point P is_JWhen the circuit is closed, the closed loop is electrified, the light emitting diode emits light, the phototriode is conducted by the light,the collector of the phototriode outputs low level; when the contact point P is_JWhen the LED is disconnected, the closed loop is disconnected, the LED does not emit light, the phototriode is cut off, and the collector of the phototriode outputs high level. Thus, the high and low levels are output through the output terminal out6 of the line verification contact signal sampling unit 6.

In the embodiment, the intelligent control unit 7 is isolated from the contact signal control loop by a photoelectric isolation method, and the contact P is closed in the verification process_JOr contact P in the event of gas leakage_JA shutdown also occurs, at which time a low level of the collector output of the phototransistor is detected. Controlling the closing of the contact P during the verification process_JIs within a predetermined length so that the contact point P is checked without leakage_JThe length of the duration time of the closed state is determined, and whether the contact P occurs in the verification process can be judged by monitoring the duration time of the received low level_JAnd closing. Therefore, the alarm signal generated by the gas density relay body 1 during verification can be judged by recording time during verification, and is not the alarm signal generated during gas leakage.

In this embodiment, the intelligent control unit 7 mainly includes a processor 71(U1) and a power supply 72 (U2). In the embodiment, the gas density relay is verified only through the temperature adjusting mechanism 5.

Example three:

as shown in fig. 3, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit, and in this embodiment, the contact sampling circuit includes a first photocoupler OC1 and a second photocoupler OC 2.

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

By the contact sampling circuit, the contact P of the gas density relay body 1 can be known conveniently_JWhether open or closed. Specifically, when the contact point P is_JWhen the circuit is closed, the closed loop is electrified, the first photoelectric coupler OC1 is conducted, the second photoelectric coupler OC2 is cut off, and the emitter (i.e. the output end out6) of the phototriode of the first photoelectric coupler OC1 outputs high level; or, the first photo coupler OC1 is turned off, the second photo coupler OC2 is turned on, and the emitter (i.e., the output end out6) of the photo transistor of the second photo coupler OC2 outputs a high level. When the contact point P is_JWhen the circuit is opened, the closed loop is powered off, the first photoelectric coupler OC1 and the second photoelectric coupler OC2 are both cut off, and the emitters (i.e., the output end out6) of the phototransistors of the first photoelectric coupler OC1 and the second photoelectric coupler OC2 output low level.

In a preferred embodiment, the contact sampling circuit further includes a first voltage regulator diode group and a second voltage regulator diode group, the first voltage regulator diode group and the second voltage regulator diode group are connected in parallel to the contact signal control loop, and the connection directions of the first voltage regulator diode group and the second voltage regulator diode group are opposite; the first voltage stabilizing diode group and the second voltage stabilizing diode group are respectively formed by connecting one, two or more than two 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 anode of the third zener diode D3 is connected with the cathode of the fourth zener diode D4.

The contact sampling circuit can conveniently realize the contact P of the gas density relay body 1_JMonitoring the state of the contact point P by combining with an intelligent control unit 7_JWhether the power grid is in an open state or a closed state is correspondingly processed, remote transmission is implemented, the signal state of the contact is known from a background, and the reliability of the power grid is greatly improved.

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

Example four:

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

The communication mode of the communication module 73(U3) may be wired, such as RS232, RS485, CAN-BUS, etc., industrial BUS, fiber ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; or wireless, such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, etc. The intelligent control unit protection circuit 74(U4) may be an anti-electrostatic interference circuit (e.g., ESD, EMI), an anti-surge circuit, an electric fast protection circuit, an anti-rf field interference circuit, an anti-pulse group interference circuit, a power supply short-circuit protection circuit, a power supply reverse protection circuit, an electrical contact mis-connection protection circuit, a charging protection circuit, etc. The intelligent control unit protection circuits can be one or formed by flexibly combining a plurality of types. The display and output 75(U5) may be a digital tube, LED, LCD, HMI, display, matrix screen, printer, fax, projector, mobile phone, etc., and may be one or a combination of several. The data storage 76(U6) may be FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched tapes, compact discs, U disks, discs, films, etc., and may be one type or a combination of several types.

Example five:

as shown in FIG. 5, the on-line checking contact signal sampling unit 6 is provided with a contact sampling circuit, which is a circuit for sampling contact signalsIn an embodiment, the contact sampling circuit comprises a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2 and a contact P of the gas density relay body_JAre connected in series to form a closed loop, and the contact point P of the gas density relay body 1_JConnected between the first hall current sensor H1 and the second hall current sensor H2; the output end of the first hall current sensor H1 and the output end of the second hall current sensor H2 are both connected with the intelligent control unit 7.

By the contact sampling circuit, the contact P of the gas density relay body 1 can be known conveniently_JWhether open or closed. Specifically, when the contact point P is_JWhen the Hall sensor is closed, a closed loop is electrified, and current flows between the first Hall current sensor H1 and the second Hall current sensor H2 to generate induced potential; when the contact point P is_JWhen the Hall sensor is opened, the closed loop is powered off, no current flows between the first Hall current sensor H1 and the second Hall current sensor H2, and the induced potential is zero.

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

Example six:

as shown in fig. 6, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit, and in this embodiment, the contact sampling circuit includes: a first silicon controlled SCR1, a second silicon controlled SCR2, a third silicon controlled SCR3, and a fourth silicon controlled SCR 4.

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

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

The working process of the embodiment is as follows:

when not verified and operating normally, the contact P_JAnd when the circuit is disconnected, the contact sampling circuit triggers the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are in a conducting state, and the contact signal control loop is in a working state. At the moment, the contact sampling circuit does not trigger the first silicon controlled rectifier SCR13 and the second silicon controlled rectifier SCR2, and the cathodes of the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 have no voltage output and are in a non-conduction state.

When verification is performed, the contact sampling circuit does not trigger the third SCR3 and the fourth SCR4, but triggers the first SCR1 and the second SCR 2. At this time, the third SCR3 and the fourth SCR4 are in an OFF state, and the contact P_JIs isolated from the contact signal control circuit. The first SCR1 and the second SCR2 are in conduction state, and the contact P_JAnd the online checking contact signal sampling unit 6 is communicated with the intelligent control unit 7.

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

Example seven:

as shown in fig. 7, the present embodiment is different from the first embodiment in that: a normally open contact J13 is added between normally closed contacts J11 and J12. In the non-verified state, the contact P_JThe normally closed contacts J11 and J12 are closed and J13 is open, and the normally open contacts J21 and J22 are open; in the checking state, the J13 of the on-line checking contact signal sampling unit closes the contact signal control loop, and the normally closed contacts J11 and J12 are opened, namely, the contact P of the gas density relay body 1 is cut off_JThe connection with the contact signal control circuit, and the normally open contacts J21 and J22 are closed to communicate with the second connecting circuit, so as to connect the contact P of the gas density relay body 1_JIs connected with the intelligent control unit 7.

When the on-line sampling and checking gas density relay with the protection function is used for checking the contact of the density relay at the environment temperature of high temperature, low temperature, normal temperature and 20 ℃, the error judgment requirements can be different, and the on-line sampling and checking gas density relay can be implemented according to the temperature requirements and relevant standards; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay body can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay body. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the density relay body and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; and the insulation performance of the gas density relay body is also detected, or detected and judged.

The gas density relay related in the online sampling and checking gas density relay with the protection function and the checking method thereof can refer to a gas density relay with components designed into an integral structure, can also refer to a gas density relay with components designed into a split structure, and can also be generally called as a gas density monitoring device.

To sum up, the application provides a pair of online sampling check-up gas density relay with protect function and check-up method for high-voltage electrical equipment, including gas density relay body, gas density detection sensor, temperature regulation mechanism, pressure adjustment mechanism, valve, online check-up contact signal sampling unit and intelligence accuse unit. The online check contact signal sampling unit is provided with a protection circuit, and when the online check contact signal sampling unit is in a non-check state, the online check contact signal sampling unit is ensured to be relatively isolated from contact signals of the gas density relay body on a circuit; when the check-up state, on-line check-up contact signal sampling unit can cut off contact signal control circuit, ensures that the contact action signal of gas density relay body can not upload, can not influence the safe operation of electric wire netting, will simultaneously the contact of gas density relay body pass through contact sampling circuit with the intelligence is controlled the unit and is connected, monitors the state of the contact of gas density relay body, has ensured the safety of intelligence accuse unit when the check-up. In addition, for the SF6 gas, a specific conversion method of the pressure-temperature characteristic of the SF6 gas can be calculated according to the Betty-Bridgman equation; for the SF6 mixed gas, a specific conversion method of the pressure-temperature characteristic of the SF6 mixed gas can be calculated according to a Dalton partial pressure law, a Betty-Bridgman equation and an ideal gas state equation. The temperature regulating mechanism is arranged in the shell of the gas density relay or outside the shell and is arranged on the shell. The temperature sensor may be digital or analog; contact or contactless. Pt100, DS18B20 temperature sensors, etc. may be employed.

The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims

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

wherein the contact signal comprises an alarm, and/or a latch.

2. A gas density monitoring device with a protection function, comprising: the device comprises a gas density relay body, a gas density detection sensor, a temperature adjusting mechanism, an online check contact signal sampling unit and an intelligent control unit;

the temperature adjusting mechanism is arranged opposite to the gas density relay body and is configured to adjust the temperature rise and fall of a temperature compensation element of the gas density relay body so as to enable the gas density relay body to generate contact signal action;

wherein the contact signal comprises an alarm, and/or a latch.

3. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, 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 are kept in opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay body;

4. The on-line sampling verification gas density relay or gas density monitoring device of claim 3, wherein: the first relay and the second relay may be two independent relays or may be the same relay.

5. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online 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 photosensitive triode; the light emitting diode is connected with the contact of the gas density relay body in series to form a closed loop; the emitting electrode of the phototriode is grounded; the collector of the phototriode is connected with the intelligent control unit, and the collector of the phototriode is also connected with a power supply through the resistor;

6. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online 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;

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

8. The on-line sampling verification gas density relay or gas density monitoring device of claim 7, wherein: the first voltage stabilizing diode group comprises a first voltage stabilizing diode and a second voltage stabilizing diode which are connected in series, and the cathode of the first voltage stabilizing diode is connected with the anode of the second voltage stabilizing diode; the second voltage stabilizing diode group comprises a third voltage stabilizing diode and a fourth voltage stabilizing diode which are connected in series, and the anode of the third voltage stabilizing diode is connected with the cathode of the fourth voltage stabilizing diode.

9. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online 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 first Hall current sensor, the second Hall current sensor and the contact of the gas density relay body are connected in series to form a closed loop, and the contact of the gas density relay body is 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 both connected with the intelligent control unit;

10. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: on-line check-up contact signal sampling unit is equipped with contact sampling circuit, contact sampling circuit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;

11. The on-line sampling verification gas density relay or gas density monitoring device of claim 10, wherein: the cathode of the first controllable silicon is connected with the intelligent control unit, and the anode of the first controllable silicon is connected with the cathode of the third controllable silicon; the control electrodes of the first controllable silicon and the third controllable silicon are connected with the intelligent control unit; the cathode of the second controllable silicon is connected with the intelligent control unit, and the anode of the second controllable silicon is connected with the cathode of the fourth controllable silicon; and the control electrodes of the second controllable silicon and the fourth controllable silicon are connected with the intelligent control unit.

12. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density detection sensor is arranged on the gas density relay body; or,

the temperature adjusting mechanism is arranged in the gas density relay body or outside the gas density relay body; or,

13. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or,

a density detection sensor adopting quartz tuning fork technology.

14. The on-line sampling verification gas density relay or gas density monitoring device of claim 13, wherein: the pressure sensor is arranged on the gas path of the gas density relay body; the temperature sensor is arranged on or outside an air path of the gas density relay body, or in the gas density relay body, or near a temperature compensation element in the gas density relay body, or outside the gas density relay body.

15. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein the temperature adjustment mechanism is a heating element; or,

the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell; or,

the temperature adjusting mechanism comprises a heating element and a temperature controller; or,

the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller; or,

the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller; or,

the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller; or,

the temperature adjusting mechanism comprises a heating element, a controller and a temperature detector; or,

the temperature adjusting mechanism is a heating element which is arranged near the temperature compensation element; or,

the temperature adjusting mechanism is a miniature thermostat;

the number of the heating elements is at least one, and the heating elements comprise but are not limited to one of silicon rubber heaters, resistance wires, electric heating tapes, electric heating rods, hot air blowers, infrared heating devices and semiconductors;

the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element, and the temperature controller comprises but is not limited to one of a PID controller, a controller combining PID and fuzzy control, a variable frequency controller and a PLC controller.

16. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, further comprising: and one end of the valve is provided with a connecting port communicated with the electrical equipment, and the other end of the valve is communicated with the gas density relay body.

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

18. The on-line sampling verification gas density relay or gas density monitoring device of claim 16, wherein: the valve is an electric valve, or an electromagnetic valve, or a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.

19. The on-line sampling verification gas density relay or gas density monitoring device of claim 1, further comprising: the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure regulating mechanism is also connected with the intelligent control unit, the pressure of the gas density relay body is regulated to rise and fall under the control of the intelligent control unit, and then the gas density relay body is matched or/and combined with the temperature regulating mechanism to generate contact signal action; or,

further comprising: the intelligent control unit is connected with the heating device; or,

still include air chamber and heating device, the air chamber with the gas density relay body is linked together, the outside or the inside of air chamber are equipped with the heating device, the intelligence accuse unit with the heating device is connected.

20. The on-line sampling verification gas density relay or gas density monitoring device of claim 19, wherein: during verification, the pressure adjusting 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 by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; or,

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

the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed 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,

the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the gas density relay body; or,

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

the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve or other deflation valves realized in an electric or gas mode; or,

the pressure regulating mechanism is a compressor; or,

the pressure regulating mechanism is a pump, and the pump comprises but is not limited to one of a pressure generating pump, a booster pump, an electric air pump and an electromagnetic air pump;

wherein the driving component includes, but is not limited to, one of a magnetic force, a motor, a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.

21. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

22. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit is provided with an electrical interface, the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or analog quantity and digital quantity information input.

23. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the intelligent control unit is controlled through field control and/or background control.

24. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, further comprising: and the display interface is used for man-machine interaction and is connected with the intelligent control unit to display the current verification data in real time or/and support data input.

25. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the gas density relay body or the monitoring device further comprises a contact resistance detection unit, and the contact resistance detection unit is connected with a contact signal or directly connected with a signal generator in the gas density relay body; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the gas density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.

26. The on-line sample-and-verify gas density relay of claim 1 or the gas density monitoring device of claim 2, wherein: the online calibration method comprises the following steps that at least two gas density relay bodies, at least two multi-way joints, at least two temperature adjusting mechanisms, at least two online calibration contact signal sampling units, an intelligent control unit and a gas density detection sensor are used for completing online calibration of the gas density relay; or,

27. A method for verifying a gas density relay, comprising:

28. A method of verifying a gas density relay as claimed in claim 27, comprising:

29. The method for verifying the gas density relay as claimed in claim 27, wherein the gas density relay or the monitoring device further comprises a valve and a pressure adjusting mechanism, a gas path of the pressure adjusting mechanism is communicated with a gas path of the gas density relay body, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay body; the method comprises the following steps:

closing the valve through an intelligent control unit;

30. The method for verifying the gas density relay as claimed in claim 27, wherein the gas density relay or the monitoring device further comprises a valve and a pressure adjusting mechanism, a gas path of the pressure adjusting mechanism is communicated with a gas path of the gas density relay body, one end of the valve is provided with a connecting port communicated with electrical equipment, and the other end of the valve is communicated with the gas path of the gas density relay body; the method comprises the following steps:

closing the valve through an intelligent control unit;

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

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

heating the heating device through an intelligent control unit to cause the temperature of gas in a gas chamber between the valve and the gas density relay to change, closing the valve through the intelligent control unit after the set value is reached, and then turning off the heating device through the intelligent control unit;

after the temperature or the pressure of the air chamber is reduced to be proper, the temperature of the gas density relay is increased by controlling the temperature adjusting mechanism through the intelligent control unit, the temperature of a temperature compensation element of the gas density relay is increased, so that the gas density relay generates contact action, the contact action is transmitted to the intelligent control unit through the contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is acted, or directly obtains the gas density value, the contact signal action value of the gas density relay is detected, and the verification work of the contact signal action value of the gas density relay is completed;

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