CN210775760U

CN210775760U - Transmitter and system for automatic on-line density checking relay

Info

Publication number: CN210775760U
Application number: CN201921464620.5U
Authority: CN
Inventors: 廖海明; 王乐乐; 常敏; 夏铁新; 曾伟
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: 2020-06-16
Anticipated expiration: 2029-09-04

Abstract

The application provides a transmitter for automatically checking a density relay on line, which comprises a pressure sensor, a temperature sensor, an intelligent control unit and a valve; the intelligent control unit is connected with the valve and controls the valve to be closed or opened; the intelligent control unit is also provided with a pressure sensor interface and a temperature sensor interface, and data collected by the pressure sensor and the temperature sensor are converted into standard signals. The method and the device are used for realizing automatic online checking of the gas density relay, and maintenance-free maintenance of the electrical equipment is realized without the need of a maintainer to operate on site. The transmitter has compact and reasonable layout, is easy to operate in connection and disassembly of each part, improves the reliability of a power grid, improves the working efficiency and reduces the cost. The application also provides a transmitter system comprising the transmitter for automatically and online checking the density relay.

Description

Transmitter and system for automatic on-line density checking relay

Technical Field

The utility model relates to an electric power tech field especially relates to an use on high pressure, middling pressure electrical equipment for automatic online check-up density relay's changer and system.

Background

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

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. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring of the gas density and micro-water content state of the SF6 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 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. Currently, on-line monitoring of gas density values in SF6 high-voltage electrical equipment is very common, and existing gas density monitoring systems (devices) 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 transformer substation is severe, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), 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 when the pressure reaches the state of alarming, locking or overpressure, information is transmitted to a target equipment terminal in time through a contact connecting circuit, 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 (such as a computer terminal) in time to realize online monitoring.

The gas density relay on the SF6 electrical equipment is regularly checked, which is a necessary measure for preventing the gas density relay from being in the bud and ensuring the safe and reliable operation of the SF6 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 SF6 gas density relay is very important and popular in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises are 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 relay, so that the gas density relay for realizing the online gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and further regular checking work of the (mechanical) gas density relay is completed, no maintainer is required to arrive at the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro-water value in the gas chamber of the electrical equipment can be accurately measured in the online self-checking gas density relay or a monitoring system consisting of the gas density relay.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an use on high pressure, middling pressure electrical equipment for automatic online check-up density relay's changer and system for when solving the gas density to the electrical equipment of gas insulation or arc extinguishing and monitoring, still accomplish the online check-up to gas density relay, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

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

a first aspect of the present application provides a transmitter for automatically on-line verifying a density relay.

In a second aspect of the present application, there is provided a transmitter system for an automatic on-line density check relay, the system being constituted by or comprising the transmitter for an automatic on-line density check relay of the first aspect.

The application a transmitter for automatic on-line check density relay, include: the intelligent control system comprises a pressure sensor, a temperature sensor, an intelligent control unit and a valve; wherein,

the intelligent control unit is connected with the valve and controls the valve to be closed or opened; the intelligent control unit is also provided with a pressure sensor interface and a temperature sensor interface, and data collected by the pressure sensor and the temperature sensor are converted into standard signals.

Preferably, the intelligent control unit transforms data collected by the pressure sensor and the temperature sensor into a gas density value, namely a pressure value corresponding to 20 ℃; or converted into a digital signal of the gas density value (namely, the pressure value corresponding to 20 ℃), and the on-line monitoring of the gas density is completed.

Preferably, the intelligent control unit transforms data collected by the pressure sensor and the temperature sensor into current signals of corresponding density values.

More preferably, the current signal is a direct current signal.

Further, the direct current signal is 0-10 mA or 4-20 mA.

Preferably, the intelligent control unit transforms data collected by the pressure sensor and the temperature sensor into voltage signals of corresponding density values.

More preferably, the voltage signal is a direct current voltage signal.

Further, the direct current voltage signal is 1-5V.

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, an industrial control motherboard, an embedded main control board and the like, and includes all peripherals, logics and input/output.

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

More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.

Preferably, a clock is further arranged on the intelligent control unit and used for regularly setting the checking time, or recording the testing time, or recording the event time.

Preferably, the transmitter monitors the gas density value of the electrical equipment on line, and if the gas density value is abnormal, the transmitter starts on-line verification of the gas density relay.

Preferably, after the transmitter completes the verification of the gas density relay, the intelligent control unit automatically generates a verification report of the gas density relay, and if the verification report is abnormal, the intelligent control unit automatically sends an alarm, and/or uploads the report to a remote end, and/or sends the report to a designated receiver (for example, a mobile phone).

Preferably, after the transmitter completes the verification of the gas density relay, if an abnormality occurs, the intelligent control unit uploads an alarm contact signal of the gas density relay to a remote end and/or sends the alarm contact signal to a designated receiver (for example, a mobile phone).

Preferably, the intelligent control unit comprises: microprocessor, man-machine interface, valve controller, pressure regulating mechanism position detector, execution controller (component).

Preferably, the valve is an electric valve, and/or 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, pressure sensors are respectively arranged on two sides of the air path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.

Preferably, a density relay or a density switch is arranged at the front end of the valve, and a signal of a safety check set point is output and connected with the intelligent control unit.

Preferably, the valve and pressure regulating mechanism are sealed within a chamber or housing; the pressure adjusting mechanism is an adjusting mechanism with adjustable pressure, and the gas path of the pressure adjusting mechanism is communicated with the gas path of the pressure sensor; the pressure adjusting mechanism is also connected with the intelligent control unit and works under the control of the intelligent control unit.

More preferably, the valve is closed, the pressure regulating mechanism boosts pressure and increases load, or the pressure regulating mechanism reduces pressure and decreases load, and the change speed of the load is not more than 10 per thousand of the measuring range of the gas density relay per second.

More preferably, the pressure regulating mechanism is a closed air chamber, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating by the refrigerating element; or,

the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with a gas circuit of the gas density relay; 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 closed air chamber through electromagnetic force; or,

the pressure adjusting mechanism is an air bag with one end connected with a driving part, and volume change is generated by the air bag under the driving of the driving part; or,

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

the pressure adjusting mechanism is a deflation valve which is arranged in a closed air chamber or is connected with the closed air chamber; 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, a pressure generating pump, a booster pump, an electric air pump or 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.

Preferably, the transmitter comprises at least one temperature sensor and at least one pressure sensor, and the pressure sensor and the temperature sensor are connected with the intelligent control unit.

More preferably, the pressure sensor and the temperature sensor are of an integrated structure; or the pressure sensor and the temperature sensor form an integrated structure with a remote transmission function, and the pressure value, the temperature value and/or the gas density value are/is remotely monitored.

More preferably, the transmitter comprises at least two pressure sensors, and the pressure values acquired by the pressure sensors are compared to complete mutual verification among the pressure sensors.

More preferably, the transmitter comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification among the temperature sensors.

More preferably, the pressure values collected by the pressure sensors and the temperature values collected by the temperature sensors are randomly arranged and combined, and the combinations are converted into a plurality of pressure values corresponding to 20 ℃ according to the gas pressure-temperature characteristics, namely gas density values, and the gas density values are compared to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are subjected to all permutation and combination, and each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristic, namely gas density values, and each gas density value is compared to complete the mutual verification of each pressure sensor and each temperature sensor; or comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with comparison density value output signals output by the gas density relay to complete mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.

Preferably, the transmitter is provided with a comparison density value output signal which is connected with the intelligent control unit; or, the changer has the pressure value output signal of comparison, should compare pressure value output signal with the intelligence is controlled the unit and is connected.

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

the transmitter comprises a pressure sensor, a temperature sensor, an intelligent control unit and a valve; the intelligent control unit is connected with the valve and controls the valve to be closed or opened; the intelligent control unit is also provided with a pressure sensor interface and a temperature sensor interface, and data collected by the pressure sensor and the temperature sensor are converted into standard signals. The method and the device are used for realizing automatic online checking of the gas density relay, and maintenance-free maintenance of the electrical equipment is realized without the need of a maintainer to operate on site. The transmitter has compact and reasonable layout, is easy to operate in connection and disassembly of each part, improves the reliability of a power grid, improves the working efficiency and reduces the cost.

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 transmitter for automatically checking a density relay on line according to the first embodiment;

FIG. 2 is a schematic diagram of a control circuit of a transmitter for an automatic on-line verification density relay according to the second embodiment;

FIG. 3 is a schematic structural diagram of a transmitter for automatically checking a density relay on line according to a third embodiment;

FIG. 4 is a schematic structural diagram of a transmitter for automatically checking a density relay on line according to a fourth embodiment;

FIG. 5 is a schematic structural diagram of a transmitter for an automatic on-line density check relay according to the fifth embodiment;

FIG. 6 is a schematic structural diagram of a transmitter for an automatic online verification density relay of the sixth embodiment;

FIG. 7 is a schematic structural diagram of a transmitter for an automatic online verification of a density relay according to the seventh embodiment;

FIG. 8 is a schematic structural diagram of a transmitter for an automatic in-line density check relay according to an eighth embodiment;

FIG. 9 is a schematic structural diagram of a transmitter for an automatic online verification density relay of the ninth embodiment;

FIG. 10 is a schematic diagram of a transmitter for an automatic in-line density check relay according to the tenth embodiment;

FIG. 11 is a schematic structural diagram of a transmitter for an automatic in-line density check relay according to an eleventh embodiment;

FIG. 12 is a schematic diagram of a transmitter for an automatic in-line density check relay according to the twelfth embodiment;

FIG. 13 is a schematic view of a control circuit according to a thirteenth embodiment;

FIG. 14 is a schematic diagram of a control circuit according to a fourteenth embodiment;

FIG. 15 is a schematic diagram of a control circuit according to the fifteenth embodiment;

FIG. 16 is a schematic diagram of a control circuit according to a sixteenth embodiment;

FIG. 17 is a schematic diagram of a control circuit according to the seventeenth embodiment;

FIG. 18 is a schematic diagram of a control circuit according to an eighteen embodiment;

FIG. 19 is a schematic diagram of a control circuit according to nineteenth embodiment;

FIG. 20 is a schematic circuit diagram of a 4-20mA type density transmitter;

FIG. 21 is a schematic structural diagram of a transmitter for an automatic in-line verification density relay of an embodiment twenty-one;

FIG. 22 is a schematic diagram of an embodiment of a transmitter system of twenty-two;

FIG. 23 is a schematic block diagram of a transmitter system of an embodiment twenty-three;

FIG. 24 is an architectural diagram of a transmitter system of an embodiment twenty-four.

Detailed Description

The utility model provides a changer and system for automatic online check-up density relay, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following reference drawing does and the example of referring to the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

A transmitter for an automatic on-line check density relay, comprising: the intelligent control system comprises a pressure sensor, a temperature sensor, an intelligent control unit and a valve; the intelligent control unit is connected with the valve and controls the valve to be closed or opened; the intelligent control unit is also provided with a pressure sensor interface and a temperature sensor interface, and data collected by the pressure sensor and the temperature sensor are converted into standard signals.

The first embodiment is as follows:

FIG. 1 is a schematic diagram of a transmitter for an automatic on-line check density relay. As shown in fig. 1, includes: the gas density relay system comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and an air supplementing interface 10. The gas density relay 1, the valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supply interface 10 are arranged on the multi-way joint 9. Wherein, pressure sensor 2, temperature sensor 3, valve 4 and intelligent control unit 7 constitute the changer, the changer is linked together with electrical equipment, gas density relay 1.

Specifically, an air inlet of the valve 4 is provided with an interface communicated with electrical equipment, the air inlet of the valve is hermetically connected to the electrical equipment and communicated with an air chamber of the electrical equipment, and an air outlet of the valve 4 is communicated with the gas density relay 1 through a multi-way connector 9; the pressure sensor 2 is communicated with the gas density relay body 1 on a gas path through a multi-way joint 9; the pressure regulating mechanism 5 is communicated with the gas density relay 1 through a multi-way joint 9; the online check contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent control unit 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7; the air supply interface 10 is communicated with the multi-way joint 9.

Wherein, gas density relay 1 includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip 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; a density relay with indication (a density relay displayed by a pointer, a density relay displayed by a digital code, a density relay displayed by a liquid crystal) and a density relay without indication (namely a density switch); SF6 gas density relay, SF6 hybrid gas density relay, N2 gas density relay, other gas density relays, and the like.

Type of pressure sensor 2: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with induction coil of a Badon tube), a resistance pressure sensor (such as a pressure measurement sensor with slide wire resistance of a Badon tube), 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 valve 4 can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear and bevel gear drive; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valve 4 can be driven by automatic valves, power-driven valves and manual valves. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve 4 may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valve 4 is connected directly or indirectly, integrally or separately, to the electrical equipment through a self-sealing valve, a manual valve, or a non-detachable valve. The valve 4 may be normally open or normally closed, or may be unidirectional or bidirectional, as desired. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc.

The pressure adjustment mechanism 5 of this embodiment is one end open-ended cavity, there is piston 51 in the cavity, piston 51 is equipped with sealing washer 510, piston 51's one end is connected with an regulation pole, drive unit 52 is connected to the outer end of adjusting the pole, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drive adjust the pole and then drive piston 51 is in the intracavity removes. The driving member 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or step motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.

The basic requirements or functions of the intelligent control unit 7 are as follows: the control of the valve 4, the control of the pressure regulating mechanism 5 and the signal acquisition are completed through the intelligent control unit 7. The realization is as follows: the pressure value and the temperature value when the contact signal of the gas density relay 1 is detected to act can be converted into the corresponding pressure value P at 20 DEG C₂₀(density value), that is, contact operating value P of gas density relay 1 can be detected_D20And the checking work of the gas density relay 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay 1 can be directly detected_D20And the checking work of the gas density relay 1 is completed.

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 of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the calibration of the rated pressure value of the gas density relay 1 is completed.

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 transmitter has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay 1 can be detected on line. Of course, the return value of the alarm and/or latch contact signal may not need to be tested as desired.

Example two:

FIG. 2 is a schematic diagram of a control circuit for a transmitter for an automatic on-line check density relay. As shown in fig. 2, the online verification contact signal sampling unit 6 of the present embodiment is provided with a protection circuit, which includes a first connection circuit and a second connection circuit, the first connection circuit connects the contact of the gas density relay 1 and the contact signal control circuit, the second connection circuit connects the contact of the gas density relay 1 and the intelligent control unit 7, and in a non-verification state, the second connection circuit is disconnected, and the first connection circuit is closed; under the check-up state, 6 cutting offs of online check-up contact signal sampling unit first connecting circuit, intercommunication second connecting circuit will gas density relay 1's contact with unit 7 is controlled to the intelligence is connected.

Specifically, the first connection circuit includes a first relay J1, and the second connection circuit includes a second relay J2. The first relay J1 is provided with normally closed 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 normally open contacts J21 and J22, and the normally open contacts J21 and J22 are connected at a contact P of the gas density relay 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 a non-verification state, the normally closed contacts J11 and J12 are closed, the normally open contacts J21 and J22 are opened, and the gas density relay monitors the 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 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. 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 pressure adjusting mechanism 5 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 of the first embodiment 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 it is necessary to verify the gas density relay 1, if the gas density value P is present₂₀Not 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 1 is isolated from the electrical equipment on a gas path.

Then, the intelligent control unit 7 controls to open the contact signal control circuit of the gas density relay 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 gas density relay 1 is not verified onlineThe safe operation of the electrical equipment is influenced, and the false alarm signal or the locking of the control loop can not be sent during the verification. 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. Meanwhile, the normally open contacts J21 and J22 of the second relay J2 of the online verification contact signal sampling unit 6 are closed, and the contact P of the gas density relay 1 is closed at this time_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 5 (which can be realized by mainly adopting a motor and a gear, the mode is various and flexible), and then the volume of the pressure adjusting mechanism 5 is adjusted to change, so that the pressure of the gas density relay 1 is gradually reduced, so that the gas density relay 1 generates contact signal action, the contact signal action is uploaded to the intelligent control unit 7 through the second relay J2 of the online checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value P and the temperature value T measured according to the contact signal action 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. After the action values of the contact signals of the alarm and/or locking signals of the gas density relay 1 are all detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure adjusting mechanism 5 to adjust the pressure adjusting mechanism 5, so that the pressure of the gas density relay 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay 1 is tested. The verification is repeated for 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 finished, the normally open contacts J21 and J22 of the second relay J2 of the online verification contact signal sampling unit 6 are disconnected, and the contact P of the gas density relay 1 is disconnected at the moment_JThe smart control unit 7 is disconnected by opening the normally open contacts J21 and J22 of the second relay J2. Intelligent control unit 7The control valve 4 is opened so that the gas density relay 1 communicates with the electrical equipment on the 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 loop of the gas density relay 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Therefore, the online checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.

After the transmitter completes the verification work, the transmitter judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) can be annunciated in situ, such as by indicator lights, digital or liquid crystal displays, and the like; 2) Or uploading is implemented through an online remote transmission communication mode, for example, the data can be uploaded to a background monitoring terminal; 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 short, after the transmitter completes the online verification work of the gas density relay 1, if an abnormality occurs, 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, such as a mobile phone. Or, after the verification work is completed, if the verification work is abnormal, the intelligent control unit 7 can upload the alarm contact signals of the gas density relay 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. Simple version on-line verification can upload the result of abnormal verification through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with 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. Specifically, the state can be uploaded well, or the state can be uploaded in a problem manner, or the verification result can be uploaded through a single verification signal line, or the verification result can be uploaded through local display, local alarm or wireless uploading and can be uploaded through the network with the smart 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 transmitter can be fully ensured in multiple modes and various combinations.

The transmitter has a safety protection function, namely when the value is lower than a set value, the transmitter automatically does not carry out online verification on the gas density relay 1 any more, and sends out an informing signal. For example, when it is detected that the gas density value is less than the set value P_SThen, checking is not performed; only when the gas density value is more than or equal to (alarm pressure value +0.02MPa), the online verification can be carried out.

The transmitter can perform online verification according to set time, and can also perform online verification according to set temperature (such as extreme high temperature, extreme low temperature, normal temperature, 20 ℃ and the like). 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 transmitter can compare the error performance of the gas density relay 1 at different temperatures and different time periods. That is, the performances of the gas density relay 1 and the electric device are judged by comparing the temperatures in the same temperature range at different times, and the comparison between the history and the present time is made.

The transmitter can be repeatedly checked for multiple times (for example, 2-3 times), and the average value of the transmitter is calculated according to the checking result of each time.

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

When the transmitter completes the check-up of the gas density relay, mutual comparison and judgment can be automatically carried out, and if the error is large, an abnormal prompt can be sent out: gas density relays or pressure sensors, temperature sensors have problems. Namely, the transmitter can complete the mutual checking function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter, and has the capability of artificial intelligence checking; after the verification work is finished, a verification report can be automatically generated, and if the verification report is abnormal, an alarm can be automatically sent out or sent to a specified receiver, for example, a mobile phone; the gas density value and the verification result are displayed on site or on the background, and the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the self-diagnosis function is provided, and abnormal and timely notices such as line breakage, short circuit alarm, sensor damage and the like can be notified; the error performance of the gas density relay can be compared according to different temperatures and different time periods. Namely, the comparison in different periods and in the same temperature range, the performance of the gas density relay is judged. The comparison of each period with history and the comparison of the history and the present are carried out. The normal and abnormal judgment, analysis and comparison can be carried out on the gas density value of the electrical equipment, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3; the system also comprises an analysis system (expert management analysis system) which is used for detecting, analyzing and judging the gas density value monitoring, the gas density relay and the monitoring element to know where the problem points are; the contact signal state of the gas density relay 1 is also monitored and transmitted remotely. The contact signal state of the gas density relay 1 can be known to be open or closed at the background, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay 1 can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay 1 can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

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

Example three:

as shown in fig. 3, a transmitter for an automatic on-line verification density relay includes: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7.

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

Through this pressure adjustment mechanism 5 regulation pressure for the contact action takes place for gas density relay 1's signal generator, the contact action is transmitted to intelligence through online check contact signal sampling unit 6 and is controlled unit 7, intelligence is controlled the gas density value when unit 7 takes place the contact action according to gas density relay 1, perhaps convert into corresponding gas density value according to pressure value and temperature value, detect gas density relay's warning and/or shutting contact signal action value and/or return value, accomplish gas density relay's check-up work. Or the checking work of the gas density relay is finished as long as the alarm and/or the locking contact action value is obtained through detection.

Example four:

as shown in fig. 4, in this embodiment, a gas supply port 10 and a self-sealing valve 11 are added as compared with the third embodiment. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve 11 is communicated with the air inlet of the valve 4 and the air supplementing interface 10 through a connecting pipe.

Example five:

as shown in fig. 5, a transmitter for automatically on-line verifying a density relay includes: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. The gas inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the gas outlet of the valve 4 is communicated with the base of the gas density relay 1, the pressure sensor 2 and the pressure adjusting mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are arranged on the rear side of the shell of the gas density relay 1. And the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electrical equipment connecting joint. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path through a base of the gas density relay 1; the pressure adjusting mechanism 5 is communicated with a pressure detector of the gas density relay 1. And the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7. Different from the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are arranged on the rear side of the housing of the gas density relay 1.

Example six:

as shown in fig. 6, a transmitter for automatically on-line verifying a density relay includes: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. The gas inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, the gas outlet of the valve 4 is communicated with a connecting pipe, the connecting pipe is communicated with a pressure detector of the gas density relay 1, and the pressure sensor 2 and the pressure adjusting mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure adjusting mechanism 5 and the pressure detector are communicated on a gas path. The gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged in a shell; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent control unit 7; the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.

Example seven:

as shown in fig. 7, a transmitter for automatically on-line verifying a density relay, comprising: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The gas density relay 1, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1 on a gas path. And the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7.

In contrast to the first embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving member 52. The pressure adjusting mechanism 5 makes the driving part 52 push the air bag 53 to change the volume according to the control of the intelligent control unit 7, thereby completing the pressure rise and fall.

Example eight:

as shown in fig. 8, a transmitter for automatically on-line verifying a density relay, includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9. The air inlet of the valve 4 is hermetically connected to the equipment connecting joint, and the air outlet of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way connector 9, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with a pressure detector of the gas density relay 1; the temperature sensor 3, the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together and arranged on the multi-way joint 9; and the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7.

The difference from the first embodiment is that: the pressure adjustment mechanism 5 of the present embodiment is mainly composed of a bellows 54 and a drive member 52. The bellows 54 is connected with the pressure detector of the gas density relay 1 in a sealing way, so as to form a reliable sealed cavity. The pressure adjusting mechanism 5 makes the driving part 52 push the corrugated pipe 54 to change the volume according to the control of the intelligent control unit 7, and then the sealed cavity changes the volume, thereby completing the pressure rise and fall. Through this pressure adjustment mechanism 5 regulated pressure for gas density relay 1 takes place the contact action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is converted into corresponding density value according to pressure value and temperature value when gas density relay 1's contact action, detects gas density relay 1's warning and/or shutting contact action value and/or return value, accomplishes the check-up work to gas density relay 1.

Example nine:

as shown in fig. 9, a transmitter for automatically on-line verifying a density relay, comprising: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure detector of the gas density relay 1. The pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path. The pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7.

In contrast to the first embodiment, the valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out through the first lead-out wire seal 42 sealed with the first housing 41, so that the design ensures that the valve 4 remains sealed and can operate reliably for a long time. The pressure adjusting mechanism 5 is sealed in the second shell 55, and a control cable of the pressure adjusting mechanism 5 is led out through a second outgoing line sealing part 56 sealed with the second shell 55, so that the pressure adjusting mechanism 5 is ensured to keep sealed and can work reliably for a long time. The second casing 55 and the first casing 41 may be integrated into one body.

Example ten:

as shown in fig. 10, a transmitter for automatically on-line verifying a density relay, comprising: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, the air outlet of the valve 4 is connected with a pressure adjusting mechanism 5, and the pressure sensor 2 is arranged on the pressure adjusting mechanism 5. Temperature sensor 3, online check-up contact signal sampling unit 6, intelligent control unit 7, gas density relay 1 set up on pressure adjustment mechanism 5. The pressure detector of the gas density relay 1, the pressure sensor 2, the pressure adjusting mechanism 5 and the valve 4 are communicated on a gas path. The temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7.

Example eleven:

as shown in fig. 11, a transmitter for automatically on-line verifying a density relay, comprising: the intelligent control system comprises a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure adjusting mechanism 5, an online verification contact signal sampling unit 6 and an intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure adjusting mechanism 5. The gas density relay 1, the first temperature sensor 31, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together and are arranged on the pressure adjusting mechanism 5; the first pressure sensor 21 is provided on the pressure adjustment mechanism 5. The second pressure sensor 22 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection terminals are connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on a gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected with the intelligent control unit 7; the valve 4 and the pressure regulating mechanism 5 are respectively connected with an intelligent control unit 7.

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 second temperature sensor 32 may also be omitted in this embodiment. The pressure sensor comprises a plurality of pressure sensors and temperature sensors, and the pressure values monitored by the pressure sensors can be compared and verified with each other; 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.

Example twelve:

as shown in fig. 12, a transmitter for automatically on-line verifying a density relay, comprising: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9. The air inlet of the valve 4 is connected to the electrical equipment in a sealing manner, and the air outlet of the valve 4 is connected with the multi-way joint 9. The valve 4 is sealed in the first shell 41, and the control cable of the valve 4 is led out through the first lead-out wire sealing member 42 sealed with the first shell 41, so that the valve 4 is ensured to keep sealed and can work reliably for a long time. The gas density relay 1 is arranged on the multi-way joint 9; the pressure regulating mechanism 5 is arranged on the multi-way joint 9. Pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on gas density relay 1. The pressure sensor 2 and the gas density relay 1 are communicated with a pressure adjusting mechanism 5 on a gas path. The valve 4, the pressure regulating mechanism 5, the pressure sensor 2 and the temperature sensor 3 are respectively connected with an intelligent control unit 7.

The difference from the first embodiment is that: pressure sensor 2, temperature sensor 3, online check-up contact signal sampling unit 6 and intelligent control unit 7 set up on gas density relay 1. The pressure adjusting mechanism 5 of the present embodiment is mainly composed of an air chamber 57, a heating element 58, and a heat insulating member 59. The air chamber 57 is externally (or internally) provided with a heating element 58, and the temperature is changed by heating, so that the pressure is increased or decreased. Through this pressure adjustment mechanism 5 regulated pressure for gas density relay 1 takes place the contact action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is converted into corresponding density value according to pressure value and temperature value when gas density relay 1's contact action, detects gas density relay's warning and/or shutting contact action value and/or return value, accomplishes the check-up work to gas density relay.

The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent control unit 7 controls the heating element 58 of the pressure adjusting mechanism 5 to heat, and when the temperature difference between the temperature value T510 in the pressure adjusting mechanism 5 and the temperature value T of the temperature sensor 3 reaches a set value, the intelligent control unit 7 can be used for closing the valve 4, so that the gas density relay is isolated from the electrical equipment on a gas path; and then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the sealed gas chamber 57 of the pressure adjusting mechanism 5, so that the gas density relay 1 generates alarm and/or locking contact action, respectively, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and the intelligent control unit 7 detects the alarm and/or locking contact action value and/or return value of the gas density relay according to the density value when the alarm and/or locking contact action is performed, thereby completing the checking work of the gas density relay.

Example thirteen:

as shown in fig. 13, the online verification contact signal sampling unit 6 of the present embodiment includes a photo coupler OC1 and a resistor R1, where 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 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 circuit, the contact point P of the gas density relay 1 can be known conveniently_JWhether open (inactive state) or closed (active state). Specifically, when the contact point P is_JWhen the light-emitting diode 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 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_JAt the time ofA predetermined length, so that the contact point P is not exposed to air and is not in the process of checking_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 1 during verification can be judged by recording the 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).

Example fourteen:

as shown in fig. 14, the online verification contact signal sampling unit 6 of the present embodiment includes a first photo coupler OC1 and a second photo coupler 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 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 circuit, the contact point P of the gas density relay 1 can be known conveniently_JWhether open (inactive state) or closed (active state). 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 photocoupler OC1 is turned off, the second photocoupler OC2 is turned on, and the emitter of the phototriode of the second photocoupler OC2(i.e., the output terminal out6) 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 circuit further comprises a first voltage stabilizing diode group and a second voltage stabilizing diode group, 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.

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 circuit can conveniently realize the contact P of the gas density relay 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.

Example fifteen:

as shown in fig. 15, the present embodiment is different from the fourteenth 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 sixteen:

as shown in fig. 16, the online verification contact signal sampling unit 6 of the present embodiment includes a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2, and a contact P of the gas density relay_JAre connected in series to form a closed loop, and the contact point P of the gas density relay 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 circuit, the contact point P of the gas density relay 1 can be known conveniently_JWhether open (inactive state) or closed (active state). 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 in useThe contact point P_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 seventeen:

as shown in fig. 17, the online verification contact signal sampling unit 6 of the present embodiment includes a first SCR1, a second SCR2, a third SCR3, and a fourth 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; contact point P of the gas density relay 1_JOne end of the first and second connecting wire is electrically connected with a wire between the first and third silicon controlled

SCRs

1 and 3, and the other end is electrically connected with a wire between the second and fourth silicon controlled

SCRs

2 and 4. 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 cathode of the first thyristor SCR1 and the cathode of the second thyristor 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 anode of the first SCR1 is connected with the cathode of the third SCR 3; the anode of the second SCR2 is connected with the cathode of the fourth SCR 4; the anode of the third SCR3 and the anode 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 checkingSaid contact P being in normal operation_JAnd the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are triggered when the circuit is disconnected, 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 first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are not triggered, 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-conducting state.

When the verification is performed, the third SCR3 and the fourth SCR4 are not triggered, and the first SCR1 and the second SCR2 are triggered. 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 eighteen:

as shown in fig. 18, 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 and operation 75(U5), a data storage 76(U6), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The intelligent control unit protection circuit 74(U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module.

The communication mode of the communication module 73(U3) may be wired: such as RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar and the like. The display and output 75(U5) may be: nixie tubes, LEDs, LCDs, HMI, displays, matrix screens, printers, faxes, projectors, mobile phones and the like can be flexibly combined by one or a plurality of types. The data store 76(U6) may be: FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched paper tapes, optical disks, U disks, discs, films, etc., can be flexibly combined by one or more types.

Example nineteenth:

as shown in fig. 19, 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), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The intelligent control unit protection circuit 74(U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module. The pressure sensor 2 passes through the overvoltage protection circuit, the operational amplifier circuit, the modulator circuit, and the filter circuit to the processor 71 (U1). In the communication module 73(U3), the communication chip is connected to the communication interface through the surge protection circuit.

Example twenty:

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

In a word, after passing through an amplifying circuit, the analog pressure sensor, the temperature sensor and the micro-water sensor are converted into A/D (analog to digital) and then into MCU (micro control unit), so that the pressure, temperature and water collection is realized. The intelligent control unit 7 can contain or be connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.

Example twenty one:

fig. 21 is a schematic structural diagram of a transmitter for automatically checking a density relay online according to twenty one embodiment of the present application. As shown in fig. 21, the transmitter includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. And the intelligent control unit 7 includes: the pressure control device comprises a processor 71(U1), a power supply 72(U2), a communication module 73(U3), an intelligent control unit protection circuit 74(U4), a valve controller 77(U7), an execution controller 78(U8), a human-computer interface 79(U9), a pressure adjusting mechanism position detector 511 and the like. The execution controller 78(U8), which may also be referred to as a control system, may be provided on the intelligent control unit 7; or the control system part device is arranged on the pressure regulating mechanism 5, and the two are closely matched and fused together.

Example twenty two:

FIG. 22 is an architectural diagram of a transmitter system. As shown in fig. 22, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of transmitters are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. Wherein, each transmitter is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of transmitters, such as a HUB1 connected with transmitters Z11, Z12 and … … Z1n, a HUB2 connected with transmitters Z21, Z22, … … Z2n and … …, and a HUB m connected with transmitters Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

The background monitor terminal includes: 1) a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2) A background software key business module: such as rights management, device management, data storage queries, etc., as well as user management, alarm management, real-time data, historical data, real-time profiles, historical profiles, configuration management, data collection, data parsing, record condition, exception handling, etc. 3) Interface configuration: such as Form interface, Web interface, configuration interface, etc.

Example twenty three:

FIG. 23 is an architectural diagram of a transmitter system. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with twenty-two embodiments. In this embodiment, the background monitor terminal PC connects two integrated application servers 1, Server2 through network switch Gateway, two integrated application servers 1, Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2, … … ProCn) through station control layer a network and B network, and protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2, … … bm) through R5485 network. Each HUB is connected with a group of transmitters, such as a HUB1 connected with transmitters Z11, Z12 and … … Z1n, a HUB2 connected with transmitters Z21, Z22, … … Z2n and … …, and a HUB m connected with transmitters Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

Example twenty-four:

FIG. 24 is an architectural diagram of a transmitter system. The embodiment is a schematic diagram of a wireless transmission mode, and a dashed box in the diagram indicates that the wireless module Wn and the transmitter Zn can be integrated or separated, and the specific scheme can be flexible.

The plurality of integrated application servers, servers 1, servers 2, … … servers n, communicate wirelessly with each transmitter via the cloud, Cluod, Wireless Gateway (Wireless Gateway), and Wireless module of each transmitter. Wherein n is a natural number.

Besides on-line checking of the gas density relay, the system can monitor physical quantities such as temperature, pressure, density and micro-water of SF6 gas in electrical equipment such as a circuit breaker and a GIS and the variation trend of the physical quantities, is provided with a communication interface, and uploads data to a background monitoring terminal, so that the on-line monitoring function of the physical quantities such as SF6 gas density and micro-water of the electrical equipment such as the circuit breaker and the GIS is realized, the alarm limit can be flexibly set, historical data can be inquired on site, the gas leakage trend and the gas leakage rate of the equipment can be accurately analyzed and judged, the abnormal condition of the equipment can be found in advance, the safe operation of the whole set of the electrical equipment and the substation can be guaranteed, and the on-line monitoring of the electrical equipment of the substation, particularly. The configuration principle is as follows: the system is constructed by adopting a bus type layered distributed structure, and the requirements of a three-layer system structure of the intelligent substation are met: the system comprises a process layer (a sensor layer, namely a transmitter for automatically checking the density relay online), a spacer layer (a data transmission and acquisition processing layer), and a station control layer (a monitoring host, a database server and the like), wherein the whole system adopts an IEC61850 standard power communication protocol. The background monitoring terminal is responsible for collecting, comprehensively analyzing, diagnosing faults, storing and forwarding standardized data of monitoring data and has the functions of real-time data display, change trend analysis, historical data query, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electrical equipment without on-site, can check and detect a gas density relay on line, can provide a solid basis for the state maintenance of SF6 electrical equipment through expert analysis software, big data analysis and trend analysis, meets the requirements of power grid automation and equipment state maintenance, and plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.

The transmitter can verify the verification precision of the gas density relay according to the relevant power industry or national standard. Under different temperatures, the calibration requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performances in DL/T259 sulfur hexafluoride gas density relay calibration regulations, the accuracy requirements, namely the error determination requirements, corresponding to each temperature value are different, and the calibration requirements can be specified according to standards or otherwise. The comparison and judgment of the same period (or the same season) of different years can be carried out. For example, the checking result of 5 months in 2021 can be directly compared with the checking result of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, and judgment is carried out. The verification can be carried out when the verification is needed, and a movable design can be carried out, namely the operation of the A transformer substation can be carried out for a period of time, after the task is completed, the B transformer substation can be moved to operate for a period of time, and after the task is completed, the C transformer substation can be moved to operate.

The verification precision of the transmitter for automatically verifying the density relay on line can reach 20 degrees and is 0.25 grade, the verification precision reaches 0.625 grade at high temperature or low temperature, and the verification precision meets the requirements, so that the requirements or related specifications are met in economy and measurement.

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 transmitter for an automatic on-line check density relay, comprising: the intelligent control system comprises a pressure sensor, a temperature sensor, an intelligent control unit and a valve; wherein,

2. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the intelligent control unit converts the data collected by the pressure sensor and the temperature sensor into a gas density value, namely a pressure value corresponding to 20 ℃; or converting the signal into a digital signal of the gas density value to finish the on-line monitoring of the gas density.

3. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the intelligent control unit transforms the data collected by the pressure sensor and the temperature sensor into current signals corresponding to the density values.

4. The transmitter for an automatic on-line verification density relay of claim 3, wherein: the current signal is a direct current signal.

5. The transmitter for an automatic on-line verification density relay of claim 4, wherein: the DC current signal is 0-10 mA or 4-20 mA.

6. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the intelligent control unit transforms the data collected by the pressure sensor and the temperature sensor into voltage signals of corresponding density values.

7. The transmitter for an automatic on-line verification density relay of claim 6, wherein: the voltage signal is a direct current voltage signal.

8. The transmitter for an automatic in-line verification density relay of claim 7, wherein: the direct current voltage signal is 1-5V.

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

10. The transmitter for an automatic on-line verification density relay of claim 9, wherein: the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged and/or preventing electromagnetic interference caused by the misconnection of a user.

11. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the intelligent control unit is further provided with a clock, and the clock is used for regularly setting the checking time, or recording the testing time, or recording the event time.

12. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the transmitter monitors the gas density value of the electrical equipment on line, and if the gas density value is abnormal, the transmitter starts on-line verification of the gas density relay.

13. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the 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.

14. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the valve is closed or opened in a hose bending or flattening mode.

15. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the valve is sealed within a chamber or housing.

16. The transmitter for an automatic on-line verification density relay of claim 1, wherein: pressure sensors are respectively arranged on two sides of the gas path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.

17. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the front end of the valve is provided with a density relay or a density switch, a signal of a safety check set point is output, and the signal is connected with the intelligent control unit.

18. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the intelligent control system comprises at least one temperature sensor and at least one pressure sensor, wherein the pressure sensor is connected with an intelligent control unit.

19. The transmitter for an automatic in-line verification density relay of claim 18, wherein: the pressure sensor and the temperature sensor are of an integrated structure; or the pressure sensor and the temperature sensor form an integrated structure with a remote transmission function, and the pressure value, the temperature value and/or the gas density value are/is remotely monitored.

20. The transmitter for an automatic in-line verification density relay of claim 18, wherein: the transmitter comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification among the pressure sensors.

21. The transmitter for an automatic in-line verification density relay of claim 18, wherein: the transmitter comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to finish mutual verification among the temperature sensors.

22. The transmitter for an automatic on-line verification density relay of claim 1, wherein: the transmitter is provided with a comparison density value output signal which is connected with the intelligent control unit; or, the changer has the pressure value output signal of comparison, should compare pressure value output signal with the intelligence is controlled the unit and is connected.

23. A changer system for automatic online check density relay, its characterized in that: the transmitter system is comprised of the transmitter for an automatic in-line check density relay of any of claims 1 to 22; alternatively, the transmitter system comprises the transmitter for an automatic in-line verification density relay of any of claims 1 to 22.