CN210668213U

CN210668213U - Gas density relay and monitoring system with insulation performance self-testing function

Info

Publication number: CN210668213U
Application number: CN201921457659.4U
Authority: CN
Inventors: 金海生; 廖海明; 常敏; 曾伟; 贺兵; 谭庆
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: 2020-06-02
Anticipated expiration: 2029-09-04

Abstract

The application provides a gas density relay and monitoring system of insulating properties self-test includes: the gas density relay comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, a signal adjusting mechanism and an equipment connecting joint, wherein the base, the pressure detector, the temperature compensation element, the at least one signal generator, the signal adjusting mechanism and the equipment connecting joint are arranged in the shell, and a contact signal is output by the gas density relay through the signal generators. Further comprising: an insulation performance detection unit and a contact signal isolation unit; the insulation performance detection unit is connected with the contact signal and the shell or directly connected with the signal generator and the shell, the contact signal of the gas density relay is isolated from the control loop of the gas density relay under the action of the contact signal isolation unit, and when an instruction for detecting the insulation performance is received, the insulation performance detection unit can test the insulation performance of the gas density relay.

Description

Gas density relay and monitoring system with insulation performance self-testing function

Technical Field

The utility model relates to an electric power tech field, concretely relates to use on high-voltage electric equipment, gas density relay and monitoring system of insulating properties self-test.

Background

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal objects, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a large amount of heat to increase the pressure of a gas chamber. 3) When the temperature is reduced, excessive moisture can form condensed water, so that the surface insulation strength of the insulation part is obviously reduced, and even flashover is caused, thereby causing serious harm. 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 digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and therefore, the application of the gas density monitoring system (gas density relay) is developed vigorously. Whereas current gas density monitoring systems (gas density relays) are basically: 1) the remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage substation is severe, especially the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, and an effective platform is established for realizing real-time data remote data reading and information monitoring. The information such as pressure, temperature, density and the like can be timely transmitted to target equipment (such as a computer terminal) to realize online monitoring.

The gas density relay on the electrical equipment is regularly checked, which is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment; the 'electric power preventive test regulation' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay is periodically checked; from the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the density relay, thereby completing the regular checking work of the (mechanical) density relay and the test of the insulation performance of the contact, and completing the checking work of the density relay without the need of the maintainer arriving at the site, thereby greatly improving the efficiency and reducing the cost. Meanwhile, the micro-water value in the air chamber of the electrical equipment is 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

The utility model provides a high pressure or medium voltage electrical equipment is used, gas density relay and monitoring system of insulating properties self-test for when solving to monitor the electrical equipment gas density of gas insulation or arc extinguishing, still accomplish the online check-up to gas density relay, and accomplish the test of contact insulating properties, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

In a first aspect of the present application, a gas density relay for insulation performance self-testing is provided.

In a second aspect of the present application there is provided a monitoring system consisting of or including the gas density relay of the insulation performance self-test of the first aspect.

The application discloses gas density relay of insulating properties self-test, include: the temperature control device comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, a signal adjusting mechanism and an equipment connecting joint, wherein the base, the pressure detector, the temperature compensation element, the signal generator, the signal adjusting mechanism and the equipment connecting joint are arranged in the shell;

the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a bimetallic strip or a sealed air chamber sealed with compensation gas;

the gas density relay also comprises an insulation performance detection unit and a contact signal isolation unit; the insulation performance detection unit is connected with the contact signal and the shell or directly connected with the signal generator and the shell;

the contact signal isolation unit comprises a first relay and a second relay, wherein the first relay comprises at least one normally closed contact, the second relay comprises at least one first normally open contact, and the normally closed contact and the first normally open contact keep opposite switch states; the normally closed contact is connected in series in a control loop of a contact of the gas density relay, and the first normally open contact is connected to the contact of the gas density relay;

the insulation performance detection unit comprises a third relay, a voltage exciter, a current detector, an amplifier and an A/D converter, wherein the third relay comprises a second normally-open contact; the contact of the gas density relay is connected with one end of a voltage exciter through a second normally open contact, the other end of the voltage exciter is grounded through a current detector, an amplifier is connected to the two ends of the current detector in parallel, and the A/D converter is connected between the output end of the amplifier and a contact signal sampling interface of the gas density relay in series;

in a non-checking state, the normally closed contact is closed, the first normally open contact and the second normally open contact are opened, and the gas density relay monitors the output state of the contacts in real time through a control loop of the contacts;

under the check-up state, normally closed contact disconnection, first normally open contact disconnection, second normally open contact is closed, voltage exciter and current detector establish ties on gas density relay's the contact, gas density relay's contact passes through second normally open contact, voltage exciter, amplifier and AD converter with gas density relay's contact signal sampling interface is connected.

Preferably, the contact signal of the gas density relay is isolated from the control loop of the gas density relay through the contact signal isolation unit, and when an instruction for detecting the insulation performance is received, the insulation performance detection unit performs an insulation performance test on the gas density relay.

Preferably, the insulation performance detection unit performs insulation resistance tests on the contact signals of the density relay and between the contact signals and the shell respectively.

Preferably, the density relay further comprises a communication module, and the detected contact resistance value of the contact of the density relay is remotely transmitted to a corresponding monitoring system or a target device through the communication module.

Preferably, the gas density relay for insulation performance self-test further comprises a pressure sensor, a temperature sensor, a pressure adjusting mechanism, a valve, an online check contact signal sampling unit and an intelligent control unit; one end of the valve is communicated with the equipment connecting joint, and the other end of the valve is communicated with the base; the pressure sensor is communicated with the pressure detector on the gas path; the pressure adjusting mechanism is communicated with the pressure detector; the online check contact signal sampling unit is respectively connected with the signal generator and the intelligent control unit; the valve is connected with the intelligent control unit; the pressure adjusting mechanism is connected with the intelligent control unit.

The valve is closed through the intelligent control unit, so that the gas density relay is isolated from the electrical equipment on a gas path; pressure is adjusted through the pressure adjustment mechanism for density relay takes place the contact action, and the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, and the intelligence is controlled the density value when the unit is moved according to the contact, detects out gas density relay's warning or shutting contact action value and/or return value, accomplishes gas density relay's check-up work.

Preferably, at least one temperature sensor is arranged in the vicinity of, on or integrated in a temperature compensation element of the gas density relay.

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

More preferably, the display mechanism of the gas density relay further comprises a digital device or a liquid crystal device with a display.

Preferably, the density relay further comprises a density measurement sensor, an intelligent processor and a communication module; on the gas path, the density measuring sensor is communicated with the pressure detector; the density measuring sensor and the communication module are connected with the intelligent processor; the intelligent processor is connected with the contact signal sampling interface. The intelligent processor collects data information through the density measurement sensor, and can remotely transmit corresponding collected data information (density value, or density value, pressure value, temperature value, or pressure value, temperature value) through the communication module. Under the action of the contact signal isolation unit, the contact signal of the density relay is isolated from the control loop of the density relay, when an instruction for detecting the insulation performance is received, the insulation performance detection unit carries out insulation performance test on the density relay to obtain the insulation performance result of the density relay, and the insulation performance result is remotely transmitted to a corresponding monitoring system or target equipment through the communication module.

Preferably, the density measurement sensor is a pressure sensor and a temperature sensor; or a density measuring sensor adopting quartz tuning fork technology; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted.

Preferably, the insulation performance detecting unit includes a small insulation resistance tester, or an insulation resistance meter.

Preferably, the insulation property detection unit includes a constant voltage source (or a constant voltage device), an amplifier, an a/D converter, and an intelligent processor; or comprise a voltage exciter.

Preferably, the insulation performance detection unit includes a withstand voltage meter.

Preferably, the contact signal isolation unit comprises an electrically controlled relay, an electrically controlled miniature switch, an optical coupler, a controllable silicon, a MOS field effect transistor or a triode.

Preferably, the gas density relay further comprises a micro water sensor, a gas circulation mechanism and a decomposition product sensor, wherein the gas circulation mechanism comprises a capillary tube with a proper length, a sealed chamber and a heating element, the gas circulation mechanism realizes gas flow by heating the heating element, and the micro water value of the gas can be monitored online; the decomposition product sensor can monitor gas decomposition products on line.

The gas density relay has a self-diagnosis function and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc.

Preferably, when the gas density relay is connected with the corresponding valve, the pressure regulating mechanism and the online check contact signal sampling unit, the valve is closed through the intelligent processor, so that the gas density relay is separated from the electrical equipment on a gas path; the gas pressure is adjusted to rise and fall through the pressure adjusting mechanism, so that the density relay generates contact signal action, the contact signal action is transmitted to the intelligent processor through the online checking contact signal sampling unit, the intelligent processor detects a contact signal (alarm or locking contact) action value and/or a return value of the gas density relay according to the density value of the contact signal action, and the checking work of the gas density relay is completed online.

Preferably, the density measurement sensor further comprises a shield capable of shielding the electric field, or the magnetic field, or both.

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

Preferably, the communication mode of the communication module includes a wired communication mode or a wireless communication mode, wherein,

the wired communication mode comprises RS232, RS485, CAN-BUS industrial BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier and cable Wire;

the wireless communication modes comprise NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.

Preferably, the core element of the intelligent processor comprises a processor formed by integrated circuits, or a programmable controller, or an industrial personal computer, or an industrial computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.

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

Preferably, the gas density relay is provided with a heater and/or a heat sink (fan), the heater being turned on at low temperatures and the heat sink (fan) being turned on at high temperatures.

Preferably, the gas density relay further comprises an insulating property detection unit, and the insulating property detection unit is connected with the contact signal and the shell or directly connected with the signal generator and the shell.

Preferably, the electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. The electrical equipment comprises a GIS, a GIL, a PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an inflatable cabinet and a ring main unit.

Preferably, the gas density relay comprises: 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; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relays.

Preferably, the gas density relay for insulation performance self-test is connected with the remote background detection system sequentially through a concentrator, an IEC61850 protocol converter or an IEC104 protocol converter; the gas density relays for insulation performance self-test are respectively arranged on the electrical equipment of the corresponding insulation gas chamber.

More preferably, the hub adopts an RS485 hub, and the IEC61850 protocol converter or the IEC104 protocol converter is also connected with the network service printer and the network data router, respectively.

Preferably, the contact signal isolation unit adopts an electrically controlled relay, or an electrically controlled miniature switch, or an optical coupler, or controllable silicon, or a circuit composed of a MOS field effect transistor, or a triode, or a circuit composed of a miniature switch, an electric contact, an optical coupler, a silicon controlled rectifier, a DI, a relay, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, a power relay and the like flexibly.

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

the utility model provides a gas density relay and monitoring system for insulation performance self-test of high-voltage electrical equipment, which are closed by a background and an intelligent control unit to lead the gas density relay to be separated from the gas insulation electrical equipment on a gas path; through pressure adjustment mechanism adjustment pressure for density relay takes place the contact action, and the contact action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, and the intelligence is controlled the density value when unit according to the contact action, detects out gas density relay's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's online check-up work, has improved the reliability of electric wire netting, has improved efficiency, the cost is reduced. Simultaneously, can also carry out the mutual self-calibration between gas density relay body and the gas density detection sensor through the intelligence accuse unit, realize the non-maintaining of the gas density relay who has online self-calibration function.

Drawings

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

fig. 1 is a schematic structural diagram of a gas density relay for insulation performance self-test according to a first embodiment;

FIG. 2 is a schematic structural diagram of a gas density monitoring device for insulation performance self-test according to an embodiment I;

FIG. 3 is a schematic diagram of a control circuit of the gas density monitoring apparatus for self-test of insulation performance according to the first embodiment;

FIG. 4 is a schematic structural diagram of a gas density monitoring device for insulation performance self-test according to the second embodiment;

FIG. 5 is a schematic structural diagram of a gas density monitoring apparatus for insulation performance self-test according to a third embodiment;

FIG. 6 is a schematic structural diagram of a gas density monitoring apparatus of a self-test of insulation performance according to a fourth embodiment;

FIG. 7 is a schematic structural diagram of a gas density monitoring apparatus of the insulation performance self-test of the fifth embodiment;

FIG. 8 is a schematic structural view of a gas density monitoring apparatus of a self-test of insulation performance according to a sixth embodiment;

FIG. 9 is a schematic structural view of a gas density monitoring apparatus of a self-test of insulation performance according to the seventh embodiment;

FIG. 10 is a schematic structural view of a gas density monitoring apparatus of an insulation performance self-test of the eighth embodiment;

FIG. 11 is a schematic structural diagram of a gas density monitoring apparatus of the self-test of insulation performance according to the ninth embodiment;

FIG. 12 is a schematic diagram showing the structure of a gas density monitoring apparatus of a self-test of insulation performance according to the tenth embodiment;

FIG. 13 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the eleventh embodiment;

FIG. 14 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the twelfth embodiment;

FIG. 15 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the thirteenth embodiment;

FIG. 16 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the fourteenth embodiment;

fig. 17 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the fifteenth embodiment;

fig. 18 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the sixteenth embodiment;

FIG. 19 is a schematic diagram of a contact sampling circuit provided in the online verification contact signal sampling unit 6 according to the seventeenth embodiment;

FIG. 20 is a schematic diagram of a 4-20mA type density transmitter circuit on a gas density relay for an embodiment eighteen insulation performance self-test;

FIG. 21 is a schematic structural view of a gas density monitoring apparatus of a nineteenth embodiment of an insulation performance self-test;

fig. 22 is an architectural schematic diagram of a gas density relay system of an insulation performance self-test of embodiment twenty;

FIG. 23 is a schematic block diagram of a gas density relay system for insulation performance self-test of example twenty-one;

fig. 24 is a schematic diagram of an architecture of a gas density relay system for insulation performance self-test of twenty-two embodiments.

Detailed Description

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

The first embodiment is as follows:

fig. 1 is a schematic structural diagram of a gas density relay for insulation performance self-test in an embodiment of the present invention. As shown in fig. 1, the gas density relay 1 includes: the device comprises a shell 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, a dial 107 and a device connecting joint 1010 which are arranged in the shell 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator 109 and enables a contact of the signal generator 109 to be switched on or off. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay 1 may also comprise a digital device with a display or a liquid crystal device.

Fig. 2 is a schematic diagram of the structure of a gas density monitoring device for insulation performance self-test. As shown in fig. 2, the gas density relay 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 check contact signal sampling unit 6, an intelligent processor 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.

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 processor 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure adjusting mechanism 5 are respectively connected with an intelligent processor 7; the air supply interface 10 is communicated with the multi-way joint 9.

FIG. 3 is a schematic diagram of the control circuit of the gas density monitoring device for insulation performance self-test. As shown in fig. 3, the online verification contact signal sampling unit 6 of this 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 control loop thereof, the second connection circuit connects the contact of the gas density relay 1 and the intelligent processor 7, and in a non-verification state, the second connection circuit is disconnected, and the first connection circuit is closed; in the checking state, the online checking contact signal sampling unit 6 cuts off the first connecting circuit, communicates the second connecting circuit and connects the contact of the gas density relay 1 with the intelligent processor 7.

Specifically, the first connection circuit includes a first relay J1, and the second connection circuit includes a second relay J2. The first relay J1 is provided with normally closed contacts J11 and J12, and the normally closed contacts J11 and J12 are connected in series in a control circuit of the contacts; 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 the non-verification state, the normally closed contacts J11 and J12 are closedAnd 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_JAnd the intelligent processor 7 is connected with the normally open contacts J21 and J22.

Further elaborating, as shown in fig. 3, the utility model discloses an online check-up contact signal sampling unit 6 includes contact signal isolation unit 6A and insulating properties detecting element 6B. Wherein the junction signal isolating unit 6A includes a relay J1 and a relay J2. And the insulation property detection unit 6B includes a relay J3(63), a voltage exciter 64, a current detector 65, an amplifier 66, and an a/D converter 67. When the pressure value is normal, the contact signal is a gas density relay of a normally open contact, wherein two pairs of normally closed contacts J11 and J12 of a relay J1 of the contact signal isolation unit 6A are connected in series in a control loop of the contact of the gas density relay; two pairs of normally open contacts J21 and J22 of the relay J2 are connected to the contacts of the gas density relay 1. Or, wherein a pair of normally closed contacts J11 of relay J1 are connected in series in the control circuit of the gas density relay contacts; a pair of normally open contacts J21 of the relay J2 are connected to the gas density relay contacts; alternatively, relay J1 and relay J2 are integrated, i.e., a relay with normally open and normally closed contacts. The combination form of the relay and the normally open/normally closed contact thereof comprises a plurality of pairs and a single.

The intelligent processor 7 mainly comprises a processor 71(U1) and a power supply 72 (U2). The processor 71(U1) may be a general-purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, 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 processor 7 monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain the 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 processor 7 controls the valve 4 to be closed, so that the gas density relay 1 is isolated from the electrical equipment on the gas path.

Then, the intelligent processor 7 controls a control loop for opening the contact of the gas density relay 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the online check contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment cannot be influenced when the gas density relay 1 is checked online, and an alarm signal cannot be mistakenly sent or the control loop cannot be locked when the gas density relay is checked. 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 intelligent processor 7 is communicated with a contact sampling circuit of the contact of the gas density relay 1, namely normally open contacts J21 and J22 of a second relay J2 of the on-line verification contact signal sampling unit 6 are closed, and at the moment, a contact P of the gas density relay 1 is closed_JIt is connected to the smart processor 7 through the normally open contacts J21 and J22 of the second relay J2.

Then, the intelligent processor 7 controls the driving part 52 of the pressure regulating mechanism 5 (which can be realized by mainly adopting a motor and a gear, and has various and flexible modes), and then regulates the generator of the pressure regulating mechanism 5The product changes to gradually reduce the gas pressure of the gas density relay 1, so that the gas density relay 1 generates a contact signal action, the contact signal action is uploaded to the intelligent processor 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, and the intelligent processor 7 converts the pressure value P and the temperature T value measured during the contact signal action into a 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 processor 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.

Meanwhile, when the density relay is checked, under the action of the contact signal isolation unit 6A, through the control of the intelligent control unit 7, the contact signal of the density relay is isolated from the control loop of the density relay, and meanwhile, when the contact signal of the density relay acts, the intelligent control unit 7 sends an instruction for detecting the insulation performance of the contact, and the insulation performance detection unit 6B can detect the contact insulation performance value R of the density relay_Jy. Referring to fig. 3, the contact signal isolating unit 6A is mainly composed of a relay J1(61) and a relay J2(62), wherein two pairs of normally closed contacts J11 and J12 of the relay J1(61) are connected in series in a control circuit of the gas density relay contacts; the two pairs of normally open contacts J21 and J22 of the relay J2(62) are connected to the contact signal of the gas density relay. It can also be: wherein a pair of normally closed contacts J11 of the relay J1(61) are connected in series in the control loop of the gas density relay contacts. The insulation performance detection unit 6B is mainly composed of a relay J3(63), a voltage exciter 64, a current detector 65, an amplifier 66, an a/D converter 67, and the like. When the contact signal of the density relay acts, the intelligent control unit 7 sends a command for detecting the insulation performance of the contact, and the contact signal isolation sheetUnder the control of the intelligent control unit 7, the two contacts J11 and J12 of the relay J1(61) are disconnected by the element 6A, so that the density relay contact P_JThe control loop of the contact point of the gas density relay is disconnected and completely isolated. While the two pairs of normally open contacts J21 and J22 of relay J2(62) remain open. Then, under the control of the intelligent control unit 7, the relay J3(63) of the insulation performance detection unit 6B is actuated, and the normally open contact J31 thereof is closed, so that the contact P of the density relay is closed_JConnected with the voltage exciter 64, the current detector 65 and the casing (ground), the leakage current Ix1 generated in the loop by the voltage exciter 64 is processed by the amplifier 66, the A/D converter 67 and the intelligent control unit 7 to obtain the accurate leakage current Ix1, and the voltage U generated by the voltage exciter 64 is combined_J1, the resistor Rd1 of the present province of the voltage exciter 64 and the resistor Rd2 of the present province of the current detector 65, the intelligent control unit 7 can conveniently detect the contact insulation performance value R of the density relay_Jy(R_Jy＝U _J1/Ix1-Rd1-Rd 2). This embodiment also adopts the constant voltage method, mainly considers that the contact insulation resistance that is surveyed is great resistance, and in addition, intelligence accuse unit 7 increases the function of returning to zero in software design to can revise the test result according to measured error, with further improvement contact insulation performance value R_JAnd y measurement accuracy.

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 processor 7 is disconnected by opening the contacts of the second relay J2 to normally open J21 and J22. The intelligent processor 7 controls the valve 4 to open, so that the gas density relay 1 is communicated with the electrical equipment on the gas path. Then, the normally closed contacts J11 and J12 of the first relay J1 of the online check contact signal sampling unit 6 are closed, the control circuit of the contact 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 gas density relay 1 completes the verification work, the gas density relay system makes a judgment and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the gas density relay system may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 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 gas density relay system 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, for example, a mobile phone. Or, after the verification work is completed, if the verification work is abnormal, the intelligent processor 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 gas density relay system can be fully ensured in multiple modes and various combinations.

Gas sealThe gas density relay system has a safety protection function, namely when the gas density relay system is lower than a set value, the gas density relay system automatically does not perform online verification on the gas density relay 1 any more, and sends out a notification signal. For example, when it is detected that the gas density value is 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 gas density relay system 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 degrees). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met.

The gas density relay system 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 electrical equipment can be repeatedly verified for a plurality of times (for example, 2 to 3 times), and the average value of the verification results is calculated according to each time. When necessary, the gas density relay 1 can be checked online at any time.

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

The basic requirements or functions of the intelligent processor 7 are: the control of the valve 4, the control of the pressure regulating mechanism 5 and the signal acquisition are accomplished by an intelligent processor 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 processor 7 may also implement: 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 processor 7 also 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 processor 7 simultaneously acquires the current density value, and completes the calibration of the rated pressure value of the gas density relay 1.

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

The gas density relay system 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.

When the gas density relay system completes the calibration of the gas density relay, the mutual comparison and judgment can be automatically carried out, and if the error difference is large, an abnormal prompt can be sent out: gas density relays or pressure sensors, temperature sensors have problems. Namely, the gas density relay system 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 system can be compared at different temperatures and different time periods. Namely, the comparison in different periods and in the same temperature range, and the performance of the gas density relay system 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 test data among the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the gas density relay system can be indicated to be normal, so that the gas density relay does not need to be checked, other devices do not need to be checked, and the gas density relay system can be free of checking in the whole 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 two:

as shown in fig. 4, the second embodiment of the present invention provides a gas density monitoring device for insulation performance self-test, including: the gas density relay comprises a gas density relay 1 (the gas density relay 1 mainly comprises a shell, and a base, a pressure detector, a temperature compensation element, a machine core, a pointer, a dial, an end seat, a plurality of signal generators and an electrical equipment connecting joint which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent processor 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 check contact signal sampling unit 6 and the intelligent processor 7 are arranged on or in the shell of the gas density relay 1, and the pressure sensor 2 is communicated with 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 processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

What distinguishes from the first embodiment is that the pressure adjustment mechanism 5 of this embodiment is the 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 adjusting lever, drive unit 52 is connected to the outer end of adjusting lever, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drives adjust the lever and then drive piston 51 is in the cavity removes, makes the sealed portion in the cavity take place the volume change, and then accomplishes the lift of pressure. 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.

In another preferred embodiment, the pressure regulating mechanism 5 may also be a solenoid valve sealed inside a housing. The pressure adjusting mechanism 5 opens the electromagnetic valve according to the control of the intelligent processor 7, pressure changes occur, and then pressure lifting is completed.

In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a bellows and a driving part 52, and the bellows and the pressure detector of the gas density relay 1 are hermetically connected together to form a reliable sealed cavity. The pressure adjusting mechanism 5 makes the driving part 52 push the bellows to change the volume according to the control of the intelligent processor 7, and then the sealed cavity changes the volume, thereby completing the pressure rise and fall.

In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a gas chamber, a heating element and a heat insulating member, wherein the heating element is provided outside (or inside) the gas chamber, and the temperature is changed by heating, thereby completing the pressure rise and fall.

Of course, the pressure adjusting mechanism 5 may have various other forms, which are not limited to the above-mentioned forms, and other mechanisms capable of realizing the pressure lifting function are also covered in the protection scope of the present application.

The pressure is adjusted through the pressure adjusting mechanism 5, so that the signal generator of the gas density relay 1 generates contact point action, the contact point action is transmitted to the intelligent processor 7 through the online checking contact point signal sampling unit 6, the intelligent processor 7 converts the gas density value into a corresponding gas density value according to the gas density value when the contact point action occurs in the gas density relay 1 or according to the pressure value and the temperature value, the alarm and/or locking contact point signal action value and/or return value of the gas density relay are detected, and the checking work of the gas density relay is completed. 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 three:

as shown in fig. 5, the third embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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. The online check joint signal sampling unit 6 and the intelligent processor 7 are arranged on the electrical equipment connecting joint. The pressure sensor 2 is communicated with the pressure detector on the 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 processor 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 four:

as shown in fig. 6, the fourth embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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 check contact signal sampling unit 6 and the intelligent processor 7 are arranged in a shell; the online check joint signal sampling unit 6 and the intelligent processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

In distinction to the first exemplary embodiment, the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating means 5, the online check contact signal sampling unit 6 and the intelligent processor 7 are arranged in one housing. 1) The pressure adjustment mechanism 5 of the present embodiment is mainly composed of a piston 51 and a drive member 52. The piston 51 is hermetically connected with the pressure detector of the gas density relay 1 and the pressure sensor 2 to form a reliable sealed cavity. The pressure adjusting mechanism 5, under the control of the intelligent processor 7, enables the driving component 52 to push the piston 51 to move, so that the volume of the sealed cavity changes, and the pressure rise and fall are completed. 2) The pressure sensor 2 and the temperature sensor 3 are arranged in a shell, and can also be formed into a gas density transmitter, so that the density value, the pressure value and the temperature value of gas can be directly obtained.

Example five:

as shown in fig. 7, the fifth embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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 processor 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 processor 7.

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

Example six:

as shown in fig. 8, the sixth embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent processor 7 and a multi-way connector 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 processor 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 processor 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 processor 7, and further the volume of the sealed cavity changes, thereby completing the pressure rise and fall. The pressure is adjusted through the pressure adjusting mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the online checking contact signal sampling unit 6, the intelligent processor 7 converts the pressure value and the temperature value into corresponding density values according to the contact action of the gas density relay 1, the alarm and/or locking contact action value and/or return value of the gas density relay 1 are detected, and the checking work of the gas density relay 1 is completed.

Example seven:

as shown in fig. 9, the seventh embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 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 eight:

as shown in fig. 10, an eighth embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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. The temperature sensor 3, the online checking contact signal sampling unit 6, the intelligent processor 7 and the gas density relay 1 are arranged on the pressure adjusting 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 processor 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

Example nine:

as shown in fig. 11, the ninth embodiment of the present invention provides an insulation performance self-testing gas density monitoring apparatus, including: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6, an intelligent processor 7 and a multi-way connector 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. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent processor 7 are arranged on the gas density relay 1. The pressure sensor 2 and the gas density relay 1 are communicated with 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 processor 7.

The difference from the first embodiment is that: the pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent processor 7 are arranged on the 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. The pressure is adjusted through the pressure adjusting mechanism 5, so that the gas density relay 1 generates contact action, the contact action is transmitted to the intelligent processor 7 through the online checking contact signal sampling unit 6, the intelligent processor 7 converts the pressure value and the temperature value into corresponding density values according to the contact action of the gas density relay 1, the alarm and/or locking contact action value and/or return value of the gas density relay are detected, and the checking work of the gas density relay is completed.

The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent processor 7 controls the heating element 58 of the pressure 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 processor 7 can close the valve 4, so that the gas density relay is separated 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 actions, respectively, the contact actions are transmitted to the intelligent processor 7 through the online checking contact signal sampling unit 6, and the intelligent processor 7 detects the alarm and/or locking contact action values and/or return values of the gas density relay according to the density values of the alarm and/or locking contact actions, thereby completing the checking work of the gas density relay.

Example ten:

as shown in fig. 12, an embodiment of the present invention provides a gas density monitoring device for insulation performance self-test, including: the device comprises a gas density relay 1, a first pressure sensor 21, a second pressure sensor 22, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 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 temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent processor 7 are arranged together and are arranged on the pressure regulating mechanism 5; the first pressure sensor 21 is provided on the pressure adjustment mechanism 5. The second pressure sensor 22 is provided on the side of the valve 4 to which the electrical connection joint is connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on a gas path; the first pressure sensor 21, the second pressure sensor 22 and the temperature sensor 3 are connected with the intelligent processor 7; the valve 4 is connected with an intelligent processor 7; the pressure regulating mechanism 5 is connected with an intelligent processor 7.

In contrast to the first embodiment, there are two pressure sensors, namely, a first pressure sensor 21 and a second pressure sensor 22. The embodiment is provided with a plurality of pressure sensors, and the pressure values monitored by the plurality of pressure sensors can be compared and checked with each other.

Example eleven:

as shown in fig. 13, the contact signal isolating unit 6A includes a relay J1(61) and a relay J2(62), in which two pairs of normally closed contacts J11 and J12 of the relay J1(61) are connected in series in a control circuit of the gas density relay contacts; the two pairs of normally open contacts J21 and J22 of the relay J2(62) are connected to the contact signal of the gas density relay. Or the following steps: wherein a pair of normally closed contacts J11 of the relay J1(61) are connected in series in a control loop of the gas density relay contact signal. The insulation property detection unit 6B includes a relay J3(63), a constant voltage source 64, a standard resistor (or voltage detector) 65, an amplifier 66, an a/D converter 67, and an intelligent control unit 7. When the contact signal of the density relay is operated and/or when a command for detecting the insulation performance of the contact is received, the contact signal isolation unit 6A is controlled by the intelligent control unit 7, the relay J1(61) is operated, and the two pairs of normally closed contacts J11 and J12 are disconnected, so that the contact P of the density relay is opened_JThe control loop of the contact point of the gas density relay is disconnected and completely isolated. While the relay J2(62) is not actuated, its two pairs of normally open contacts J21 and J22 remain open. Then, under the control of the intelligent control unit 7, the relay J3(63) of the insulation performance detection unit 6B is operated, and the pair of normally open contacts J31 thereof is closed, so that the contact P of the density relay is closed_J Constant pressureThe source 64 and the standard resistor (or voltage detector) 65, the housing (ground) are connected to each other, the voltage Ub generated by the constant voltage source 64 at the constant voltage source 64 and the standard resistor (or voltage detector) 65 is processed by the amplifier 66, the a/D converter 67, and the intelligent control unit 7 to obtain the accurate voltage Ub, and the intelligent control unit 7 combines the resistance value Rb of the standard resistor (or voltage detector) 65 according to Ub_JKnowing the leakage current Ix1(Ix1 is Ub/Rb), and combining with the constant voltage Uh generated by the constant voltage source 64, the contact insulation performance value R of the density relay can be detected conveniently_Jy (R_Jy ═ u h-Ub)/Ix 1. In the embodiment, a constant voltage method is adopted, the insulation resistance of a tested contact is mainly considered to be larger resistance, and in addition, in order to improve the measurement precision, the influence of a test lead on a measurement result is eliminated. In addition, the intelligent control unit 7 adds a zeroing function on the software design, and can correct the test result according to the measured error so as to further improve the insulation performance value R of the contact_JAnd y measurement accuracy.

Example twelve:

as shown in fig. 14, the contact signal isolating unit 6A includes a relay J1(61) and a relay J2(62), in which two pairs of normally closed contacts J11 and J12 of the relay J1(61) are connected in series in the control circuit of the gas density relay contacts, and a pair of normally open contacts J13 are connected in parallel in the control circuit of the gas density relay contacts; the two pairs of normally open contacts J21 and J22 of the relay J2(62) are connected to the contact signal of the gas density relay. Or the following steps: wherein a pair of normally closed contacts J11 of the relay J1(61) are connected in series in the control loop of the gas density relay contacts, and a pair of normally open contacts J13 are connected in parallel in the control loop of the gas density relay contacts. The insulation performance detection unit 6B includes a relay J3(63), a voltage exciter 64, a current detector 65, an amplifier 66, an a/D converter 67, and an intelligent control unit 7. When receiving a command for detecting the insulation performance of the contacts, the contact signal isolation unit 6A operates the relay J1(61) under the control of the intelligent control unit 7, and the two pairs of normally closed contacts J11 and J12 are opened to make the density relay contact P_JThe control loop of the contact point of the gas density relay is disconnected and completely isolated. Meanwhile, the joint J13 is closed so as not to affect the operation of the power gridAnd (6) mixing. While the relay J2(62) is not actuated, its two pairs of normally open contacts J21 and J22 remain open. Then, under the control of the intelligent control unit 7, the relay J3(63) of the insulation performance detection unit 6B is actuated, and the normally open contact J31 thereof is closed, so that the contact P of the density relay is closed_JConnected with the voltage exciter 64, the current detector 65 and the casing (ground), the leakage current Ix1 generated in the loop by the voltage exciter 64 is processed by the amplifier 66, the A/D converter 67 and the intelligent control unit 7 to obtain the accurate leakage current Ix1, and the voltage U generated by the voltage exciter 64 is combined_J1, the resistor Rd1 of the present province of the voltage exciter 64 and the resistor Rd2 of the present province of the current detector 65, the intelligent control unit 7 can conveniently detect the contact insulation performance value R of the density relay_Jy(R_Jy＝U _J1/Ix1-Rd1-Rd 2). This embodiment also adopts the constant voltage method, mainly considers that the contact insulation resistance that is surveyed is great resistance, and in addition, intelligence accuse unit 7 increases the function of returning to zero in software design to can revise the test result according to measured error, with further improvement contact insulation performance value R_JAnd y measurement accuracy.

Example thirteen:

as shown in fig. 15, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit, in this embodiment, the contact sampling circuit includes a first hall current sensor H1 and a second hall current sensor H2, the first hall current sensor H1, the second hall current sensor H2 and a contact P of the gas density relay body_JAre connected in series to form a closed loop, and the contact point P of the gas density relay body 1_JConnected between the first hall current sensor H1 and the second hall current sensor H2; the output end of the first hall current sensor H1 and the output end of the second hall current sensor H2 are both connected with the intelligent control unit 7.

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

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

Example fourteen:

as shown in fig. 16, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit, and in this embodiment, the contact sampling circuit includes: a first silicon controlled SCR1, a second silicon controlled SCR2, a third silicon controlled SCR3, and a fourth silicon controlled SCR 4.

The first silicon controlled rectifier SCR1 is connected with the third silicon controlled rectifier SCR3 in series, and the second silicon controlled rectifier SCR2 is connected with the fourth silicon controlled rectifier SCR4 in series and then forms a series-parallel closed loop with a series circuit formed by the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR 3; a contact point P of the gas density relay body 1_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 verified and operating normally, the contact P_JAnd when the circuit is disconnected, the contact sampling circuit triggers the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4, the third silicon controlled rectifier SCR3 and the fourth silicon controlled rectifier SCR4 are in a conducting state, and a control loop of the contact is in a working state. At the moment, the contact sampling circuit does not trigger the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2, and the cathodes of the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 have no voltage output and are in a non-conduction state.

When verification is performed, the contact sampling circuit does not trigger the third SCR3 and the fourth SCR4, but triggers the first SCR1 and the second SCR 2. At this time, the third SCR3 and the fourth SCR4 are in an OFF state, and the contact P_JIs isolated from the control circuit of the contact. 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 fifteen:

as shown in fig. 17, the present embodiment is different from the twelfth 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. 18, the smart processor 7 is mainly composed of a processor 71(U1), a power supply 72(U2), a communication module 73(U3), a smart processor protection circuit 74(U4), a display and output and operation 75(U5), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The smart processor protection circuit 74(U4) includes surge protection circuitry, filter circuitry, short circuit protection circuitry, polarity protection circuitry, over-voltage protection circuitry, 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.

Example seventeen:

as shown in fig. 19, the smart processor 7 is mainly composed of a processor 71(U1), a power supply 72(U2), a communication module 73(U3), a smart processor protection circuit 74(U4), and the like. The processor 71(U1) contains a crystal oscillator and filter circuitry. The smart processor protection circuit 74(U4) includes surge protection circuitry, filter circuitry, short circuit protection circuitry, polarity protection circuitry, over-voltage protection circuitry, 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 eighteen:

FIG. 20 is a schematic of a 4-20mA type density transmitter circuit on a gas density relay for insulation performance self-test. 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) signals and then are converted into MCU (micro control unit) signals, so that the pressure, temperature and water collection is realized. The intelligent processor 7 can contain or be connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.

Example nineteenth:

fig. 21 is a schematic structural diagram of a gas density monitoring apparatus for insulation performance self-test according to nineteenth embodiment of the present application. As shown in fig. 21, the gas density monitoring apparatus includes: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check contact signal sampling unit 6 and an intelligent processor 7. And the intelligent processor 7 includes: processor 71(U1), power supply 72(U2), communication module 73(U3), intelligent processor protection circuit 74(U4), valve controller 77(U7), execution controller 78(U8), human-machine interface 79(U9), pressure adjustment mechanism position 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 processor 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:

fig. 22 is an architectural diagram of a gas density relay system of an insulation performance self-test of embodiment twenty. As shown in fig. 22, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of gas density relays are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. Wherein, each gas density relay is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of gas density relays, such as a HUB1 connected with gas density relays Z11, Z12 and … … Z1n, a HUB2 connected with gas density relays Z21, Z22, … … Z2n and … …, and a HUB m connected with gas density relays 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 one:

fig. 23 is a schematic diagram of an architecture of a gas density relay system for insulation performance self-test of example twenty-one. 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 the twenty embodiment. 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 gas density relays, such as a HUB1 connected with gas density relays Z11, Z12 and … … Z1n, a HUB2 connected with gas density relays Z21, Z22, … … Z2n and … …, and a HUB m connected with gas density relays Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

Example twenty two:

fig. 24 is a schematic diagram of an architecture of a gas density relay system for insulation performance self-test of twenty-two embodiments. 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 gas density relay Zn can be integrated or separated, and the specific scheme can be flexible.

The multiple integrated application servers 1, servers 2 and … … servers n are in Wireless communication with the gas density relays through the cloud end Cluod, the Wireless Gateway (Wireless Gateway) and the Wireless modules of the gas density relays. 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 gas density relay), a spacing layer (a data transmission and collection processing layer), a station control layer (a monitoring host, a database server and the like), and the whole system adopts an IEC61850 standard electric 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 checking precision of the gas density relay can be related to the 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 gas density relay has the advantages that the checking precision can reach 20 degrees and is 0.25 grade, the checking precision can reach 0.625 grade at high temperature or low temperature, the checking precision meets the requirements, and the requirements or related specifications are met economically and quantificationally.

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

In particular, a gas density relay for insulation performance self-test generally refers to a conventional integrated gas density relay, a separately designed gas density monitoring device, a separately designed gas density monitor, and the like.

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. An insulation performance self-testing gas density relay, comprising: the temperature control device comprises a shell, a base, a pressure detector, a temperature compensation element, at least one signal generator, a signal adjusting mechanism and an equipment connecting joint, wherein the base, the pressure detector, the temperature compensation element, the signal generator, the signal adjusting mechanism and the equipment connecting joint are arranged in the shell;

2. The gas density relay for insulation performance self-test as claimed in claim 1, wherein the contact signal of the gas density relay is isolated from its control loop by a contact signal isolation unit, and the insulation performance detection unit performs an insulation performance test on the gas density relay when receiving an instruction for detecting the insulation performance.

3. The gas density relay for insulation performance self-test as claimed in claim 1, wherein the insulation performance detecting unit performs insulation resistance test on each contact signal of the density relay and between each contact signal and the housing.

4. The gas density relay for insulation performance self-test as claimed in claim 1, further comprising a communication module for transmitting the detected contact resistance value of the density relay to the corresponding monitoring system or to the target device.

5. An insulation performance self-testing gas density relay according to claim 1, characterized in that at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of said gas density relay.

6. The self-testing gas density relay of claim 1, further comprising a display mechanism, said display mechanism comprising a movement, a pointer, a dial, said movement being fixed to said base; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; alternatively, the first and second electrodes may be,

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

7. The gas density relay of claim 1, wherein said density relay further comprises a density measurement sensor, a smart processor, a communications module; on the gas path, the density measuring sensor is communicated with the pressure detector; the density measuring sensor and the communication module are connected with the intelligent processor; the intelligent processor is connected with the contact signal sampling interface.

8. The gas density relay of claim 7, wherein said density measurement sensors are pressure sensors and temperature sensors; or a density measuring sensor adopting quartz tuning fork technology; or a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted.

9. The self-testing gas density relay of claim 7, wherein said density measurement sensor further comprises a shield that shields against electric fields, or magnetic fields, or both.

10. The gas density relay of claim 7, wherein the intelligent processor automatically controls the whole monitoring process based on embedded algorithms and control programs of general purpose computer, industrial personal computer, ARM chip, AI chip, CPU, MCU, FPGA, PLC, etc., industrial control mainboard, embedded main control board, etc., including all peripherals, logic and input/output.

11. The insulation performance self-testing gas density relay according to claim 7, wherein the communication means of said communication module comprises wired communication means or wireless communication means, wherein,

12. The gas density relay of claim 7, wherein the core element of the intelligent processor comprises a processor composed of an integrated circuit, or a programmable controller, or an industrial personal computer, or an industrial computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.

13. The gas density relay of the insulation performance self-test of claim 1, wherein the insulation performance detection unit comprises an insulation resistance tester or an insulation resistance meter and a withstand voltage meter.

14. The insulating property self-testing gas density relay as claimed in claim 1, wherein said contact signal isolating unit comprises an electrically controlled relay, or an electrically controlled miniature switch, or an opto-coupler, or a silicon controlled thyristor, or a MOS field effect transistor, or a triode.

15. The gas density relay of claim 1, wherein the gas density relay further comprises a micro water sensor, a gas circulation mechanism and a decomposition sensor, wherein the gas circulation mechanism comprises a capillary tube with proper length, a sealed chamber and a heating element, and gas flow is realized by heating the heating element, so that the micro water value of the gas can be monitored online; the decomposition product sensor can monitor gas decomposition products on line.

16. The self-testing gas density relay of claim 1, further comprising an analysis system for detecting and analyzing the gas density monitoring, the performance of the gas density relay, and the monitoring element.

17. The gas density relay for insulation performance self-test according to claim 1, wherein the gas density relay is provided with a heater and/or a heat sink, the heater is turned on at low temperature and the heat sink is turned on at high temperature.

18. The gas density relay of claim 1, further comprising an insulation detection unit connected to the contact signal and the housing, or directly connected to the signal generator and the housing.

19. The gas density relay for insulation performance self-test according to claim 1, wherein the gas density relay for insulation performance self-test is connected with a remote background detection system sequentially through a concentrator, an IEC61850 protocol converter or an IEC104 protocol converter; the gas density relays for insulation performance self-test are respectively arranged on the electrical equipment of the corresponding insulation gas chamber.

20. The gas density relay of claim 19, wherein the hub is an RS485 hub, and the IEC61850 protocol converter or the IEC104 protocol converter is further connected to the network service printer and the network data router, respectively.

21. A monitoring system, characterized in that it is constituted by an insulation performance self-testing gas density relay according to any of claims 1 to 20; alternatively, the monitoring system comprises an insulation performance self-testing gas density relay of any of claims 1 to 20.