CN211718032U

CN211718032U - Gas density relay with online self-checking function and monitoring device

Info

Publication number: CN211718032U
Application number: CN201921457322.3U
Authority: CN
Inventors: 金海生; 廖海明; 蒲东海; 常敏; 曾伟; 贺兵; 沈德茂
Original assignee: Shanghai Roye Electric Science and Technology Co Ltd
Current assignee: Shanghai Roye Electric Science and Technology Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-10-20
Anticipated expiration: 2029-09-04

Abstract

The application provides a gas density relay and monitoring devices with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, normally open valve, normally closed valve, air chamber, online check-up contact signal sampling unit and intelligence accuse unit. Through normally open valve, normally closed valve, the lift of gas pressure is realized to the air chamber, make the gas density relay body take place the contact signal action, the contact signal action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, density value when the intelligence is controlled the unit and is moved according to the contact signal, detect out warning and/or shutting contact signal action value and/or the return value of gas density relay body, need not maintainer to accomplish the check-up work of gas density relay to the scene, realize non-maintaining, the reliability of electric wire netting has been improved greatly, the efficiency is improved, and the cost is reduced. Meanwhile, zero emission of gas is realized in the whole checking process, and the method is environment-friendly, safe and economical.

Description

Gas density relay with online self-checking function and monitoring device

Technical Field

The utility model relates to an electric power tech field, concretely relates to use on high pressure, middling pressure electrical equipment, have on line from gas density relay and monitoring devices of check-up function.

Background

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ 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 may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Therefore, the operation regulation of the power grid is forced to be specified and put into operation in equipmentThe density and moisture content of the SF6 gas must be periodically checked both before and during operation.

With the development of the unattended transformer substation towards networking and digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and for this reason, the application of a gas density monitoring system (gas density relay) is developed vigorously. Whereas current gas density monitoring systems (gas density relays) are basically: 1) the remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the 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. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage substation is severe, especially the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote transmission type SF6 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 is provided with one group, two groups or three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be 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. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the working efficiency is greatly improved, and the cost is reduced. The whole checking process needs environmental protection and safety.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas density relay and monitoring devices with online self-checking function to solve the problem that provides in the above-mentioned technical background.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the first aspect of the present application provides a gas density relay with an online self-checking function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a normally open valve, a normally closed valve, a gas chamber, an online check contact signal sampling unit and an intelligent control unit;

one end of the normally-closed valve is communicated with the gas path of the gas density relay body, and the other end of the normally-closed valve is communicated with the gas chamber; the gas chamber and the normally-closed valve are configured to establish or store low-pressure gas, and the pressure drop of the gas density relay body is adjusted to enable the gas density relay body to generate contact signal action;

one end of the normally open valve is provided with an interface communicated with electrical equipment, and the other end of the normally open valve is communicated with the gas path of the gas density relay body, or the other end of the normally open valve is connected with the gas path of the normally closed valve, so that the normally open valve is communicated with the gas path of the gas density relay body; the normally open valve is configured to close or open an air path of the electrical equipment, complete the closing of the air path of the electrical equipment, and adjust the pressure rise of the gas density relay body to enable the gas density relay body to generate contact signal resetting;

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

the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body;

the intelligent control unit is respectively connected with the normally open valve, the normally closed valve, the gas density detection sensor and the online check contact signal sampling unit, and is configured to control the normally open valve to be closed or opened, control the normally closed valve to be closed or opened, control pressure value collection and temperature value collection and/or gas density value collection, and detect a contact signal action value and/or a contact signal return value of the gas density relay body;

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

The second aspect of the present application provides a gas density monitoring device with an online self-calibration function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a normally open valve, a normally closed valve, a gas chamber, 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 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 relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.

More preferably, the gas path of the normally-closed valve is communicated with the pressure detector; the other end of the normally open valve is communicated with the base and the pressure detector, or the other end of the normally open valve is connected with an air path of the normally closed valve, so that the normally open valve is communicated with the base and the pressure detector; and the online check contact signal sampling unit is connected with the signal generator.

More preferably, the gas density relay body further comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with a display of the value.

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

More preferably, the gas density relay body or the intelligent control unit further comprises an insulation resistance detection unit, and the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online check contact signal sampling unit, the contact signal of the gas density relay body is isolated from a control loop of the gas density relay body, and when the contact signal of the gas density relay body acts and/or receives an instruction of detecting the contact insulation resistance, the insulation resistance detection unit can detect the contact insulation resistance value of the gas density relay body.

Preferably, the gas density detection sensor is provided on the gas density relay body; or the normally-closed valve and the gas chamber are arranged on the gas density relay body; or the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or, normally closed valve, air chamber 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; alternatively, a density detection sensor using 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 a thermal resistor and a thermocouple.

More preferably, at least one of the temperature sensors is arranged near or on or integrated in a temperature compensation element of the gas density relay body. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay body, which is close to the temperature compensation element.

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

Further, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is used for representing the pressure sensor, the calibration result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing the calibration result, and the calibration result is converted into the corresponding relative pressure value at 20 ℃;

when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃;

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

P_{absolute pressure}＝P_{Relative pressure}+P_{Standard atmospheric pressure}。

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.

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 normally closed and/or normally open valves are sealed within a chamber or housing.

Preferably, the air chamber is externally or internally provided with a heating element, the heating element is connected with the intelligent control unit, the heating element heats the air chamber to increase the temperature of the air in the air chamber, the density of the air in the air chamber is further reduced, and the air chamber and the normally-closed valve establish or store low-pressure air.

More preferably, the air chamber further comprises a heat preservation member, and the heat preservation member is arranged outside the air chamber.

More preferably, the gas density relay body further comprises a flow valve controlling a gas release flow rate.

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

Preferably, the gas density relay or monitoring device further comprises a flow controller configured to control the magnitude of the flow of the gas; the flow controller is arranged on the normally open valve side or the normally closed valve side; alternatively, one flow controller is provided on each of the normally open valve side and the normally closed valve side.

Preferably, the normally closed valve and the gas chamber are sealed within a single chamber or housing.

Preferably, pressure sensors are respectively arranged on two sides of the air path of the normally-open valve or the normally-closed 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 normally open 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 joint signal sampling unit is provided with at least one group of independent sampling joints, can automatically complete check on at least one joint simultaneously, and continuously measures without changing the joint or reselecting the joint; wherein the content of the first and second substances,

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

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

Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to gas density, accomplish promptly the on-line monitoring of gas density relay to the electrical equipment who monitors.

More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in 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, so as to complete online verification of the gas density relay; alternatively, the first and second electrodes may be,

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

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

More preferably, the gas density relay with the online self-checking function completes online checking of the gas density relay according to the setting or the instruction of the background; alternatively, the first and second electrodes may be,

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

Preferably, the gas density relay with the online self-checking function further comprises a multi-way joint, and the gas density relay body, the normally-open valve and the normally-closed valve are arranged on the multi-way joint; or the normally open valve and the gas density relay body are arranged on the multi-way joint; alternatively, the gas density relay body, the gas density detection sensor, the normally open valve, and the normally closed valve are provided on the multi-way joint.

More preferably, the gas density relay with the online self-checking function further comprises a first connecting pipe, and the gas path of the normally-closed valve is communicated with the gas density relay body through the first connecting pipe; and a first interface of the multi-way joint is communicated to the part of the first connecting pipe between the gas density relay body and the normally-closed valve.

More preferably, the normally open valve is communicated to the second port of the multi-way joint and communicated with the gas density relay body through the multi-way joint.

More preferably, the normally open valve is communicated with an interface of the electrical equipment and communicated to the first interface of the multi-way joint; the gas density relay body is communicated with the multi-way connector through the normally open valve; and the second interface of the multi-way joint is used for connecting electrical equipment.

More preferably, the temperature sensor is communicated to the air passage of the multi-way joint or communicated to the third interface of the multi-way joint.

Preferably, the gas density relay with an online self-checking function further comprises: a self-sealing valve installed between the electrical device and the normally open valve; alternatively, the normally open valve is installed between the electrical device and the self-sealing valve.

Preferably, the gas density relay with an online self-checking function further comprises: a gas supplementing interface; the air supply interface is arranged on the electrical equipment; or the air supply interface is arranged between the electrical equipment and the normally open valve; or the air supply interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the normally open valve and the gas density relay body.

Preferably, the gas density relay with an online self-checking function further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.

Preferably, the gas density relay with an online self-checking function further comprises: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.

More preferably, the gas density relay with an online self-checking 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 gas density relay with online self-checking function still includes the decomposition thing sensor, the decomposition thing sensor respectively with the gas density relay body with the intelligence is controlled the unit and is connected.

Preferably, the gas chamber of the gas density relay with the online self-checking function is further provided with a second pressure sensor, and the second pressure sensor is connected with the intelligent control unit and is configured to monitor the gas pressure value of the gas chamber.

Preferably, the gas density relay with the online self-checking function further comprises a camera for monitoring.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has:

the application provides a gas density relay and monitoring devices with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, normally open valve, normally closed valve, air chamber, online check-up contact signal sampling unit and intelligence accuse unit. The normally open valve is closed through the intelligent control unit, so that the gas density relay body is isolated from the electrical equipment on a gas path; open the normally closed valve through the intelligence unit of controlling, make gas pressure slowly descend, make gas density relay take place the contact signal action, the contact signal action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, density value when the intelligence is controlled the unit and is moved according to the contact signal, detect out warning and/or shutting contact signal action value and/or the return value of gas density relay body, need not maintainer to the check-up work that the scene just can accomplish gas density relay, the reliability of electric wire netting is improved, the efficiency is improved, and the cost is reduced. Simultaneously, can also carry out the mutual self-calibration between gas density relay body and the gas density detection sensor through the intelligence accuse unit, realize the non-maintaining of the gas density relay who has online self-calibration function. The whole verification process of this application realizes gaseous zero release of SF6, accords with environmental protection regulation requirement.

Drawings

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

fig. 1 is a schematic structural diagram of a gas density relay with an online self-checking function according to a first embodiment;

fig. 2 is a schematic structural diagram of a gas density relay with an online self-checking function according to a second embodiment.

Illustration of the drawings:

1. a gas density relay body; 2. a pressure sensor; 21. a first pressure sensor; 22. a second pressure sensor; 3. a temperature sensor; 31. a first temperature sensor; 32, a first step of removing the first layer; a second temperature sensor; 4. A normally open valve; 51. normally closing the valve; 57. an air chamber; 58. a heating element; 512. a flow controller B; 6. an online check contact signal sampling unit; 7. an intelligent control unit; 9. a multi-way joint; 10. a gas supplementing interface; 12. and a flow controller A.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

fig. 1 is a schematic structural diagram of a gas density relay with an online verification function for a high and medium voltage electrical device according to an embodiment of the present application.

As shown in fig. 1, a gas density relay with an online verification function includes a gas density relay body 1, and the gas density relay body 1 includes: the casing, and locate base, end seat, pressure detector, temperature compensation component, a plurality of signal generator, core, pointer, calibrated scale in the casing. One end of the pressure detector is fixed on the base and communicated with the base, the other end of the pressure detector is connected with one end of the temperature compensation element through the end seat, the other end of the temperature compensation element is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator and enables a contact of the signal generator to be connected or disconnected. The movement is fixed on the base; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is installed on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display the gas density value. The gas density relay body 1 may further include a digital device or a liquid crystal device having an indication display.

In addition, the gas density relay with the online verification function further comprises: the device comprises a pressure sensor 2, a temperature sensor 3, a normally open valve 4, a normally closed valve 51, an air chamber 57, a heating element 58, a flow controller B512, an online verification contact signal sampling unit 6 and an intelligent control unit 7. One end of the normally open valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the normally open valve 4 is communicated with the base of the gas density relay body 1; the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the normally-closed valve 51 is communicated with a pressure detector through a flow controller B512; the online check contact signal sampling unit 6 is respectively connected with the signal generator and the intelligent control unit 7; the normally open valve 4, the normally closed valve 51, the heating element 58 and the flow controller B512 are further connected to the intelligent control unit 7 respectively.

The gas density relay comprises a gas density relay body 1, a signal generator, a signal processing circuit and a power supply, wherein the signal generator comprises a micro switch or a magnetic auxiliary electric contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell. The gas density relay of the present application may further include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge.

In the above embodiment, the normally open valve 4 and the normally closed valve 51 may be various, and a shut-off valve, such as a ball valve, a butterfly valve, a gate valve, a stop valve, a plug valve, a butterfly valve, a needle valve, or a diaphragm valve, may be used. If the ball valve, the self-sealing valve core can be rotated to drive the ball valve to close the air passage of the switch device, and the self-sealing valve can be flexibly designed according to actual requirements. The normally open valve 4 and the normally closed valve 51 are automatic, and can be verified manually or semi-manually.

Type of pressure sensor 2: can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number can be several. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).

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

The online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification. When the contact signal of the gas density relay body 1 acts during the calibration, the safe operation of the electrical equipment cannot be influenced; 2) the contact signal control loop of the gas density relay body 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.

The basic requirements or functions of the intelligent control unit 7 are as follows: the control and signal acquisition of the normally open valve 4, the normally closed valve 51, the heating element 58 and the flow controller B512 are completed through the intelligent control unit 7. The realization is as follows: can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts, and convert the pressure value and temperature value into the corresponding pressure value P at 20 DEG C₂₀(density value), that is, the contact operating value P of the gas density relay body 1 can be detected_D20And the calibration work of the gas density relay body 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay body 1 can be directly detected_D20And the calibration work of the gas density relay body 1 is completed. Meanwhile, the self-checking work among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay body 1, and the maintenance-free operation is realized.

Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value output signal of gas density relay body 1, the density value at that time is gathered simultaneously to intelligence accuse unit 7, accomplishes the rated pressure value check-up of gas density relay body 1.

Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.

The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the normally open valve 4, the normally closed valve 51, the gas chamber 57, the heating element 58, the flow controller B512, the online verification contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly arranged as required. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; in short, the arrangement between them can be flexibly arranged and combined. The gas density relay body, the gas density detection sensor, the normally open valve 4, the normally closed valve 51, the gas chamber 57, the heating element 58, the flow controller B512, the online verification contact signal sampling unit 6 and the intelligent control unit 7 can be set up flexibly as required.

The working principle of the gas density relay with the online checking function for checking and monitoring is as follows:

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 7; the normally open valve 4 is opened, the normally closed valve 51 is closed, and the gas pressure of the gas chamber 57 is in a low pressure state. The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain the corresponding pressure of 20 DEG CValue P₂₀(i.e., gas density value). When the density relay body 1 needs to be checked, if the gas density value P is detected at the moment₂₀Not less than set safety check density value P_S(ii) a The gas density relay sends an instruction, the online check contact signal sampling unit 6 is adjusted to a check state through the intelligent control unit 7, and in the check state, the online check contact signal sampling unit 6 cuts off a contact signal control loop of the gas density relay body 1 and connects the contact of the gas density relay body 1 to the intelligent control unit 7; the normally open valve 4 is closed through the intelligent control unit 7; the normally closed valve 51 is opened through the intelligent control unit, so that the gas pressure is slowly reduced, and the gas flows to the gas chamber 57, so that the gas density relay body 1 generates contact action, the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6, the intelligent control unit 7 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 completes the verification work of the contact signal action value of the gas density relay; open normally open valve 4 through intelligence accuse unit 7, make gas pressure slowly rise for gas density relay takes place the contact and resets, and the contact resets and transmits intelligence through online check-up contact signal sampling unit and controls unit 7, and intelligence accuse unit 7 obtains gas density value according to pressure value, temperature value when the contact resets, or directly obtains gas density value, detects out gas density relay's contact signal return value, accomplishes the check-up work of gas density relay's contact signal return value. After all contact signal check work is accomplished, intelligence accuse unit 7 control the heating element 58 of air chamber, through heating element 58 leads to the temperature of the gas in the air chamber 57 rises, and then accomplishes the density of gas in the air chamber 57 descends, and after the setting value, intelligence accuse unit 7 closes normally closed valve 51, makes air chamber 57 and normally closed valve 51 accomplish and establish or store the gas of low pressure. The intelligent control unit 7 adjusts the online check contact signal sampling unit 6 to the working state, and the contact signal control loop of the gas density relay is restored to the normal working state of operation.

Because the gas density relay is already gas-sealed before the calibration is startedValue P₂₀Not 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. During the check-up, the gaseous pressure of gas density relay body 1 descends gradually for density relay body 1 takes place the contact action, and its contact action passes through on-line check-up contact signal sampling unit 6 and uploads to intelligence accuse unit 7, and the pressure value and the temperature value that record when intelligence accuse unit 7 moved according to the contact are converted into the pressure value P when corresponding 20 ℃ according to the gas characteristic to intelligence₂₀(density value), the contact point action value P of the gas density relay body 1 can be detected_D20After the contact action values of the alarm and/or the locking signals of the gas density relay body 1 are detected, the intelligent control unit 7 is used for controlling the gas density relay body 1 to gradually increase the pressure of the gas density relay body 1, and the return values of the alarm and/or the locking signals of the gas density relay body 1 are tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time, the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. Meanwhile, the normally open valve 4 is opened through the intelligent control unit 7, so that the gas density relay body 1 is communicated with the electrical equipment on a gas path. Through the control circuit of unit 7 intercommunication gas density relay body 1 is controlled to the intelligence, the normal work of density monitoring circuit of gas density relay body 1, and gas density of gas density relay body 1 safety monitoring electrical equipment makes gas equipment work safe and reliable. Therefore, the online checking work of the gas density relay body 1 can be conveniently completed, and the safe operation of the electrical equipment can not be influenced when the gas density relay body 1 is checked online.

After the gas density relay body 1 completes the checking work, the gas density relay judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the gas density relay can upload the data in an online remote transmission communication mode, for example, the data can be uploaded to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In a word, after the gas density relay completes the online checking work of the gas density relay, if the gas density relay is abnormal, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the gas density relay completes the calibration work of the gas density relay, if the gas density relay is abnormal, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay body 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. The simple gas density relay is used for on-line calibration, and the result of abnormal calibration can be uploaded through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with an alarm signal contact and is regularly closed and opened, and the condition can be obtained through analysis; or through a separate verification signal line. The intelligent mobile phone can be uploaded in good state or in problem, or can be uploaded through remote density on-line monitoring, or can upload a verification result through a single verification signal line, or can be uploaded through on-site display, on-site alarm or wireless uploading and can be uploaded through the internet with the intelligent mobile phone. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and various combinations.

The gas density relay has a safety protection function, and particularly, when the gas density relay is lower than a set value, the gas density relay does not automatically act on the density relay any moreThe device performs an online check and issues a notification signal. For example, when the gas density value of the plant is less than the set value P_SIt is not verified. For example: only when the gas density value of the equipment is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.

The gas density relay may be checked on line according to a set time, or may be checked on line according to a set temperature (for example, a limit high temperature, a limit low temperature, a normal temperature, 20 degrees, etc.). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.

The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods. Namely, the performances of the gas density relay and the electrical equipment are judged by comparing the temperature ranges in different periods. The comparison of each period with history and the comparison of the history and the present are carried out.

The gas density relay can be repeatedly verified for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated according to the verification result of each time. When necessary, the gas density relay can be checked on line at any time.

Meanwhile, the density relay can also monitor the gas density value, and/or the pressure value, and/or the temperature value of the electrical equipment on line, and upload the gas density value, and/or the pressure value, and/or the temperature value to target equipment to realize on-line monitoring.

Example two:

as shown in fig. 2, the second embodiment of the present invention provides a gas density relay or gas density monitoring device with an online self-calibration function, including: the gas density relay comprises a gas density relay body 1 (the gas density relay body 1 mainly comprises a shell, and a base, a pressure detector, a temperature compensation element, a machine core, a pointer, a dial, an end seat, a plurality of signal generators and an electrical equipment connecting joint which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a normally open valve 4, a normally closed valve 51, an air chamber 57, a heating element 58, a flow controller B512, a flow controller A12, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9 and an air supplementing interface 10. The air supply interface 10 and the multi-way joint 9 are added in the embodiment. One end of the normally open valve 4 is communicated with electrical equipment, the other end of the normally open valve is communicated with a flow controller A12, and a flow controller A12 is communicated with the multi-way connector 9; the gas density relay body 1 is communicated with the multi-way connector 9; the normally closed valve 51 is communicated with the multi-way joint 9. Normally closed valve 51 communicates with gas chamber 57 through flow controller A12. The air supply interface 10 and the pressure sensor 21 are also respectively arranged on the multi-way joint 9. The temperature sensor 31 is provided on the gas density relay body 1. The pressure sensor 22 and the temperature sensor 32 are provided on the gas chamber 57. The mounting position of the multi-way joint 9 can be flexibly arranged according to the requirement. In addition, when the gas density relay with the online self-checking function comprises a micro-water sensor, the micro-water sensor can also be arranged on the multi-way joint 9; when the gas density relay with the online self-checking function comprises a decomposition product sensor, the decomposition product sensor can also be arranged on the multi-pass connector 9; when the gas density relay with the online self-checking function comprises the gas supplementing interface, the gas supplementing interface can also be arranged on the multi-way connector 9, and the gas supplementing interface is not listed.

Different from the first embodiment, there are two pressure sensors, namely a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The temperature sensor 32 may also be omitted in this embodiment. The second embodiment of the utility model provides a gas density relay with online calibration function has a plurality of pressure sensor and temperature sensor, can compare, check each other between the pressure value that a plurality of pressure sensor monitoring obtained; the temperature values obtained by the plurality of temperature sensors can be compared and verified mutually; the corresponding gas density values obtained by monitoring the pressure sensors and the temperature sensors can be compared and verified with each other.

A gas density relay with on-line self-checking function generally refers to that its component elements are designed into an integral structure; the gas density monitoring device generally refers to that the components of the gas density monitoring device are designed into a split structure and flexibly formed.

To sum up, the utility model provides a pair of gas density relay with online self-checking function comprises gas circuit (can be through the pipeline) coupling part, pressure regulation part, signal measurement control part etc. and the primary function is that the contact signal (the pressure value when warning/shutting action) of gas density relay under the ambient temperature carries out online check-up measurement to the corresponding pressure value when automatic conversion becomes 20 ℃, the performance testing to the contact (warning and shutting) value of gas density relay is realized on line. The mounting positions of the gas density relay, the pressure sensor, the temperature sensor, the normally open valve, the normally closed valve, the online checking contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay body, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together, integrally designed and also can be designed in a split mode; can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. The normally open valve can be directly connected with electrical equipment, and can also be connected through a self-sealing valve or an air pipe. The pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together and are designed integrally; the pressure sensor and the temperature sensor can be combined together and are designed integrally; the online check joint signal sampling unit and the intelligent control unit can be combined together to realize integrated design. In short, the structure is not limited.

When the contact of the density relay is verified at the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃, the requirement for error judgment of the density relay can be different, and the method can be implemented according to the temperature requirement and the related standard; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay body can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay body. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the density relay body and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; and the insulation performance of the gas density relay body is also detected, or detected and judged. 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 anti-rust and anti-vibration device is compact and reasonable in structural arrangement, good in anti-rust and anti-vibration capacity of each part, firm in installation and reliable in use. The connection, the dismouting of each pipeline of gas density relay are easily operated, and equipment and part are convenient to be maintained. The gas density relay calibration device can complete the calibration work of the gas density relay without a maintainer going to the site, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost.

The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims

1. A gas density relay with an online self-checking function is characterized by comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a normally open valve, a normally closed valve, a gas chamber, an online check contact signal sampling unit and an intelligent control unit;

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

2. The gas density relay with the online self-checking function according to claim 1, wherein the gas density relay body comprises: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.

3. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the gas path of the normally-closed valve is communicated with the pressure detector; the other end of the normally open valve is communicated with the base and the pressure detector, or the other end of the normally open valve is connected with an air path of the normally closed valve, so that the normally open valve is communicated with the base and the pressure detector; and the online check contact signal sampling unit is connected with the signal generator.

4. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the gas density relay body also comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or

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

5. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the gas density relay body or the intelligent control unit further comprises a contact resistance detection unit, and the contact resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay body is isolated from the control loop of the gas density relay body, and when the contact signal of the gas density relay body acts and/or receives an instruction of detecting contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay body.

6. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor is arranged on the gas density relay body; alternatively, the first and second electrodes may be,

the normally-closed valve and the air chamber are arranged on the gas density relay body; alternatively, the first and second electrodes may be,

the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; alternatively, the first and second electrodes may be,

normally closed valve, air chamber 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.

7. The gas density relay with the online self-checking function according to claim 6, wherein: the gas density relay body and the gas density detection sensor are of an integrated structure.

8. The gas density relay with the online self-checking function according to claim 7, wherein: the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.

9. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor is of an integrated structure.

10. A gas density relay with an on-line self-checking function according to claim 9, characterized in that: the gas density detection sensor is a gas density transmitter with an integrated structure.

11. A gas density relay with an on-line self-checking function according to claim 10, wherein: the online checking contact signal sampling unit is arranged on the gas density transmitter.

12. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; alternatively, the first and second electrodes may be,

a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, the first and second electrodes may be,

a density detection sensor adopting quartz tuning fork technology.

13. A gas density relay with an on-line self-checking function according to claim 12, wherein: the pressure sensor is arranged on the gas path of the gas density relay body.

14. A gas density relay with an on-line self-checking function according to claim 12, wherein: the temperature sensor is arranged on or outside the gas path of the gas density relay body, or in the gas density relay body, or outside the gas density relay body.

15. A gas density relay with an on-line self-checking function according to claim 12, wherein: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.

16. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online check joint signal sampling unit and the intelligent control unit are arranged together.

17. A gas density relay with an on-line self-checking function according to claim 16, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

18. The gas density relay with the online self-checking function according to claim 1, characterized in that: the normally closed valve and/or the normally open valve are sealed in a cavity or a shell.

19. The gas density relay with the online self-checking function according to claim 1, characterized in that: the outside or the inside heating element that is equipped with of air chamber, heating element is connected with the unit is controlled to the intelligence, through the heating element heating, results in the temperature of the interior gas of air chamber risees, and then accomplishes the gaseous density decline in the air chamber makes air chamber and normally closed valve establish or store the gas of low pressure.

20. A gas density relay with on-line self-checking function according to claim 19, characterized in that: the air chamber further comprises a heat preservation piece, and the heat preservation piece is arranged outside the air chamber.

21. The gas density relay with the online self-checking function according to claim 1, characterized in that: the normally open valve or the normally closed valve is an electric valve and/or an electromagnetic valve, or 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.

22. The gas density relay with the online self-checking function according to claim 1, characterized in that: the flow controller is configured to control the flow size of the gas; the flow controller is arranged on the normally open valve side or the normally closed valve side; alternatively, one flow controller is provided on each of the normally open valve side and the normally closed valve side.

23. The gas density relay with the online self-checking function according to claim 1, characterized in that: the normally closed valve and the gas chamber are sealed in a chamber or housing.

24. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online checking contact signal sampling unit samples the contact signal of the gas density relay body to meet the following requirements:

the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.

25. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the electrical equipment who monitors.

26. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay; alternatively, the first and second electrodes may be,

27. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; alternatively, the first and second electrodes may be,

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

28. The gas density relay with the online self-checking function according to claim 1, characterized in that: 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.

29. The gas density relay with the online self-checking function as claimed in claim 1, wherein the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or checking results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

30. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is also provided with a clock, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.

31. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is controlled through field control and/or background control.

32. The gas density relay with the online self-checking function according to claim 1, further comprising: the gas density relay body, the normally open valve and the normally closed valve are arranged on the multi-way joint; alternatively, the first and second electrodes may be,

the normally open valve and the gas density relay body are arranged on the multi-way joint; alternatively, the first and second electrodes may be,

the gas density relay body, the gas density detection sensor, the normally open valve and the normally closed valve are arranged on the multi-way joint.

33. A gas density relay with on-line self-verification function according to claim 32, wherein: the gas circuit of the normally-closed valve is communicated with the gas density relay body through the first connecting pipe; and a first interface of the multi-way joint is communicated to the part of the first connecting pipe between the gas density relay body and the normally-closed valve.

34. A gas density relay with on-line self-verification function according to claim 32, wherein: the normally open valve is communicated to the second interface of the multi-way joint and communicated with the gas density relay body through the multi-way joint.

35. A gas density relay with on-line self-verification function according to claim 32, wherein: the interface of the normally open valve communicated with the electrical equipment is communicated to the first interface of the multi-way joint; the gas density relay body is communicated with the multi-way connector through the normally open valve; and the second interface of the multi-way joint is used for connecting electrical equipment.

36. The gas density relay with the online self-checking function according to claim 1, further comprising: a self-sealing valve installed between the electrical device and the normally open valve; alternatively, the normally open valve is installed between the electrical device and the self-sealing valve.

37. The gas density relay with the online self-checking function according to claim 1, further comprising: a gas supplementing interface;

the air supply interface is arranged on the electrical equipment; alternatively, the first and second electrodes may be,

the air supply interface is arranged between the electrical equipment and the normally open valve; alternatively, the first and second electrodes may be,

the air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the normally open valve and the gas density relay body.

38. The gas density relay with the online self-checking function according to claim 1, further comprising: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.

39. The gas density relay with the online self-checking function according to claim 1, further comprising: respectively with the gas density relay body with the little water sensor that the unit is connected is controlled to the intelligence, and/or respectively with the gas density relay body with the decomposition thing sensor that the unit is connected is controlled to the intelligence.

40. The gas density relay with the online self-checking function as claimed in claim 1, wherein the gas chamber is further provided with a second pressure sensor, and the second pressure sensor is connected with the intelligent control unit and configured to monitor a gas pressure value of the gas chamber.

41. The utility model provides a gas density monitoring devices with online self-checking function which characterized in that: the gas density monitoring device is composed of a gas density relay with an online self-checking function as claimed in any one of claims 1-40; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-40.