CN211043029U

CN211043029U - Gas density relay and monitoring system for self-testing contact point contact resistance

Info

Publication number: CN211043029U
Application number: CN201921457503.6U
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: 2020-07-17
Anticipated expiration: 2029-09-04

Abstract

The application provides a from gas density relay and monitoring system of test contact resistance, gas density relay includes: the device comprises a shell, and a base, a pressure detector, a temperature compensation element, at least one signal generator, a signal adjusting mechanism and a device connecting joint which are arranged in the shell. The gas density relay outputs contact signals through a plurality of signal generators. The gas density relay further comprises: a contact resistance detection unit and a contact signal isolation unit; the contact resistance detection unit is connected with the contact point signal or directly connected with the signal generator. Under the action of the contact signal isolation unit, the contact of the gas density relay is isolated from the control circuit of the gas density relay, and when the contact of the gas density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.

Description

Gas density relay and monitoring system for self-testing contact point contact resistance

Technical Field

The utility model relates to an electric power tech field, concretely relates to use on high-voltage electrical equipment, from gas density relay and monitoring system of test contact resistance.

Background

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. 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, and then the regular checking work of the (mechanical) density relay is completed, including the test of the contact point contact resistance, and the checking work of the density relay can be completed 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, from testing contact resistance's gas density relay and monitoring system 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, including contact resistance's test, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

A first aspect of the present application provides a gas density relay that self-tests contact resistance.

In a second aspect of the present application, there is provided a monitoring system comprising or including the gas density relay of the first aspect which self-tests contact resistance.

The application a gas density relay from test contact resistance, 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 a contact resistance detection unit and a contact point signal isolation unit; the contact resistance detection unit is connected with the contact point signal or directly connected with the signal generator;

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 contact resistance detection unit comprises a third relay, a constant current source, an amplifier and an A/D converter, wherein the third relay comprises at least one second normally-open contact; the constant current source and the amplifier are connected to two ends of a contact of the gas density relay in parallel through a second normally open contact, 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, the constant current source with the amplifier is parallelly connected on gas density relay's the contact, gas density relay's contact passes through second normally open contact, 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 circuit of the gas density relay through the contact signal isolation unit, and the contact resistance detection unit can detect the contact resistance value of the contact of the density relay when the contact signal of the density relay acts and/or when an instruction for detecting the contact resistance of the contact is received.

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

Preferably, the gas density relay of self-testing contact resistance further comprises: the system 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 gas 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. More preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay close to the temperature compensation element.

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 or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is 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.

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

Preferably, the intelligent processor of the density relay is connected with the contact signal isolation unit, the contact resistance detection unit and the communication module.

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 remotely transmits the data information (density value, or density value, pressure value and temperature value, or pressure value and temperature value) through the communication module. Under the effect of the contact signal isolation unit, the contact signal of the gas density relay is isolated from the control loop of the gas density relay, the contact resistance value of the contact of the density relay is detected by the contact resistance detection unit, and the contact resistance value is remotely transmitted to a corresponding monitoring system or target equipment through the communication module.

More 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.

More preferably, the density measurement sensor further comprises a shield for shielding the electric field, and/or the magnetic field.

More 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 P L C, an industrial control motherboard, an embedded main control board and the like, and includes all peripherals, logics, input and output.

More preferably, the communication mode of the communication module comprises a wired communication mode or a wireless communication mode, wherein the wired communication mode comprises one or more of RS232, RS485, CAN-BUS industrial BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, P L C power carrier and cable wires, and the wireless communication mode comprises one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic waves, sound waves, satellites, light waves, quantum communication and sonar.

More preferably, 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.

Preferably, the contact resistance detecting unit includes a small resistance detector.

Preferably, the contact resistance detection unit includes a constant current source (or constant current device), an amplifier, an a/D converter, and an intelligent processor; or, a constant voltage source (or constant current device), an amplifier, an a/D converter, and an intelligent processor.

Preferably, the lead wire aspect of the contact resistance detecting unit is of a two-wire system, or a three-wire system, or a four-wire system.

Preferably, the contact resistance detecting unit includes a milliohm meter, or a volt-ampere meter, or an ampere-potentiometer.

Preferably, the gas density relay further comprises a micro water sensor for on-line monitoring of the gas micro water value and a gas circulation mechanism, and/or a decomposition product sensor for on-line monitoring of the gas decomposition product, wherein the gas circulation mechanism comprises a capillary tube, a sealed chamber and a heating element, and the gas circulation mechanism realizes gas flow by heating the heating element, so that the gas micro water value can be monitored 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 gas density relay generates contact action, the contact action is transmitted to the intelligent processor through the online check 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 action, and the check work of the gas density relay is completed online.

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

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 insulation performance detection unit, and the insulation performance 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 GIS, GI L, PASS, circuit breakers, current transformers, voltage transformers, gas-filled cabinets, ring main units, and the like.

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 of the self-test contact resistor is connected with the remote background detection system sequentially through the concentrator, the IEC61850 or the IEC104 protocol converter; the gas density relays of the self-test contact point resistors are respectively arranged on the corresponding electrical equipment of the insulating air 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 a controllable silicon, or an MOS field effect transistor, or a triode, or a circuit flexibly composed of a miniature switch, an electrical contact, an optical coupler, a controllable silicon, a DI, a relay, an MOS field effect transistor, a triode, a diode, an MOS FET relay, a solid state relay, a time relay, a power relay, and the like.

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 a monitoring system of a self-testing contact point contact resistor for 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 gas insulation electrical equipment on a gas path; pressure is adjusted through the pressure adjustment mechanism for gas 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 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 view of a gas density relay of a self-test contact resistance according to a first embodiment;

FIG. 2 is a schematic structural diagram of a gas density monitoring apparatus for self-testing contact resistance of a contact according to a first embodiment;

FIG. 3 is a schematic diagram of a control circuit of the gas density monitoring apparatus for self-testing contact resistance of a contact according to the first embodiment;

FIG. 4 is a schematic structural diagram of a gas density monitoring apparatus for self-testing contact resistance of a contact according to a second embodiment;

FIG. 5 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to a third embodiment;

FIG. 6 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to a fourth embodiment;

FIG. 7 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to a fifth embodiment;

FIG. 8 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to the sixth embodiment;

FIG. 9 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to the seventh embodiment;

FIG. 10 is a schematic structural view of a gas density monitoring apparatus self-testing contact resistance of a contact according to an eighth embodiment;

FIG. 11 is a schematic structural view of a gas density monitoring apparatus for self-testing contact resistance of a contact according to the ninth embodiment;

FIG. 12 is a schematic structural view of a gas density monitoring apparatus self-testing contact resistance of a contact in accordance with 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 self-testing contact resistance gas density relay in accordance with the eighteenth embodiment;

fig. 21 is a schematic structural view of a gas density monitoring apparatus of a self-test contact resistance according to nineteenth embodiment;

fig. 22 is an architecture diagram of a gas density relay system that self-tests contact resistance of a contact according to an embodiment twenty;

FIG. 23 is a schematic diagram of an embodiment twenty-one gas density relay system with self-test contact resistance;

fig. 24 is a schematic diagram of an embodiment of a twenty-two gas density relay system with self-test contact resistance.

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 self-testing contact resistance of a high and medium voltage electrical device according to 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 structural view of a gas density monitoring device that self-tests contact resistance of a contact. 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 a control circuit for a gas density monitoring device that self-tests contact resistance of a contact. 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 circuit of the contact signal, the second connection circuit connects the contact of the gas density relay 1 and the intelligent processor 7, 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 loop of the contact signal; 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); also, the first relay J1 and the second relay J2 may be integrated, that is, they are integratedThe relay is provided with normally open and normally closed contacts. In a non-verification state, the normally closed contacts J11 and J12 are closed, the normally open contacts J21 and J22 are opened, and the gas density relay monitors the contact P in real time_JThe output state of (1); in the verification state, the normally closed contacts J11 and J12 are opened, the normally open contacts J21 and J22 are closed, and the contact P of the gas density relay 1 is closed_JIs connected with the intelligent processor 7 through the normally open contacts J21 and J22.

Further elaborating, as shown in fig. 3, the online verification contact signal sampling unit 6 of the present invention mainly includes a contact signal isolation unit 6A and a contact resistance detection unit 6B. Wherein the junction signal isolating unit 6A includes a relay J1 and a relay J2. And the contact resistance detection unit 6B includes a relay J3(63), a constant current source 64, an amplifier 65, an a/D converter 66, and an intelligent control unit 7. 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, a pair of normally closed contacts J11 of the relay J1 are connected in series in a control loop 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), a power supply 72(U2), the processor 71(U1) can 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 P L C and the like, an industrial control mainboard, an embedded main control board and the like, and other intelligent integrated circuits, the power supply 72(U2) can be a switching power supply, an alternating current 220V, a direct current power supply, a L DO, a programmable power supply, solar energy, a storage battery, a rechargeable battery, a battery and the like, a pressure sensor 2 of a pressure acquisition P can be various pressure sensing elements such as a pressure sensor and a pressure transmitter, a temperature sensor 3 of a temperature acquisition T can be various temperature sensing elements such as a temperature sensor and a temperature transmitter, a valve 4 can be an electromagnetic valve, an electric valve, a pneumatic valve, a ball valve, a needle valve, a regulating valve, a stop valve and the like, and can be an opening and closing gas circuit, even a semi-automatic or manual valve, and the pressure regulating mechanism 5 can be an electric regulating piston, an electric regulating cylinder, a pressurizing valve.

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 signal of the gas density relay 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the online verification contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment cannot be influenced when the gas density relay 1 is verified online, and an alarm signal cannot be mistakenly sent or the control loop cannot be locked when the gas density relay is verified. 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 (which may be mainly electric) of the pressure adjusting mechanism 5The machine (motor) and the gear are realized, the mode is various and flexible), and then the volume change occurs in the pressure adjusting mechanism 5, the pressure of the gas density relay 1 is gradually reduced, the gas density relay 1 generates the 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, the pressure value P and the temperature T value measured when the intelligent processor 7 acts according to the contact signal are converted into the pressure value P corresponding to 20 ℃ according to the gas characteristics₂₀(density value), the contact action value P of the gas density relay can be detected_D20. After the action values of the contact signals of the alarm and/or locking signals of the gas density relay 1 are all detected, the intelligent 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.

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 loop of the contact signal 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.

Meanwhile, when the gas density relay is checked, under the action of the contact signal isolation unit 6A, the contact signal of the gas density relay is isolated from the control loop of the gas density relay through the control of the intelligent control unit 7, and simultaneously, the gas density relay is controlled by gasWhen the contact signal of the bulk density relay acts, the intelligent control unit 7 sends an instruction for detecting the contact resistance of the contact, and the contact resistance detection unit 6B can detect the contact resistance value R of the gas density relay_J. As shown in fig. 3, 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 contact resistance detection unit 6B includes a relay J3(63), a constant current source 64, an amplifier 65, and an a/D converter 66. When the contact signal of the density relay is actuated, the intelligent control unit 7 sends a command for detecting contact resistance of the contact, the contact signal isolation unit 6A is controlled by the intelligent control unit 7, two contacts J11 and J12 of the relay J1(61) are disconnected, and the contact P of the density relay is enabled_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 contact resistance detection unit 6B is operated, and the two pairs of normally open contacts J31 and J32 thereof are closed, so that the constant current source 64 and the contact P of the amplifier 65 and the density relay are closed_JConnected to each other by a current I generated by a constant current source 64_JSo that the contact point P of the density relay_JVoltage U is generated at two ends_JThe accurate voltage U is obtained through the processing of the amplifier 65, the A/D converter 66 and the intelligent control unit 7_JThe intelligent control unit 7 is based on R_J＝U_J/I_JThen the contact resistance R of the density relay can be detected_J. In this embodiment, a constant current method is also used, and the measurement can be performed by using a four-wire system in order to improve the measurement accuracy and eliminate the influence of the test lead on the measurement result, mainly considering that the resistance of the contact to be measured is a small resistance. In addition, the intelligent control unit 7 adds a zeroing function on software design, and can correct the test result according to the measured error so as to further improve the contact electricity of the contact pointResistance value R_JThe measurement accuracy of (2). After the whole density relay verification (including contact resistance detection) is completed, the device sends an instruction, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay 1, namely, the contacts J31 and J32 of the electromagnetic relay J3 are disconnected, and the contacts J21 and J22 of the electromagnetic relay J2 of the online verification contact signal sampling unit 6 are disconnected, at the moment, the contact P of the gas density relay_JThe intelligent control unit 7 is disconnected by opening the contacts J21 and J22 of the electromagnetic relay J2. At the same time, the monitoring device sends out an instruction, namely, the valve 4 is opened through the intelligent control unit 7, so that the gas density relay 1 is communicated with the electrical equipment 8 on the gas path. The monitoring device then sends out the instruction again, through the control circuit of intelligence accuse unit 7 intercommunication gas density relay 1, the contact J11 and the J12 of the electromagnetic relay J1 of online check contact signal sampling unit 6 are closed promptly for gas density relay 1's density monitoring circuit normal work makes gas density relay 1 safety monitoring electrical equipment 8's gas density, makes electrical equipment 8 safe and reliable work. Therefore, the online checking work (including contact resistance detection) of the gas density relay 1 can be conveniently completed, and the safe operation of the electrical equipment 8 can not be influenced when the gas density relay 1 is checked online.

After the gas density relay 1 completes the checking work, the gas density relay system judges and CAN report the detection result, and the method is flexible, and specifically, the gas density relay system CAN report the local state, such as display through an indicator light, a number or a liquid crystal, and the like, 2) or upload through an online remote transmission communication mode, such as upload to a background monitoring terminal, 3) or upload to a specific terminal through wireless upload, such as wireless upload to a mobile phone, 4) or upload through other ways, 5) or upload an abnormal result through an alarm signal line or a special signal line, 6) or upload in a binding manner with other signals, in a word, after the gas density relay system completes the online checking work of the gas density relay 1, if abnormal, the gas density relay system CAN automatically send an alarm, CAN upload to a remote end, or CAN send to a designated receiver, such as a mobile phone, or after the checking work is completed, if abnormal, the intelligent processor 7 CAN upload an alarm signal at an alarm signal connection point (a monitoring room, a monitoring platform, and the like) of the gas density relay 1 through a wireless communication mode, such as remote communication, a wireless communication mode, a wireless communication mode such as a wireless communication mode, a wireless communication mode of a wireless communication mode, a wireless communication mode of a wireless communication port, a wireless communication port of a wireless communication port, a wireless communication port of a wireless communication port, a wireless communication port of a wireless communication.

The gas density relay system has a safety protection function, namely when the gas density relay system is lower than a set value, the gas density relay system automatically does not perform 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 also can perform online verification according to set temperature (such as ultimate high temperature, ultimate low temperature, normal temperature, 20 ℃ and the like). when the environment temperature of the high temperature, the low temperature, the normal temperature and the 20 ℃ is subjected to online verification, the error judgment requirement is different, for example, when the environment temperature of the 20 ℃ is verified, the accuracy requirement of the gas density relay is 1.0 grade or 1.6 grade, and when the environment temperature is high, the accuracy requirement of the gas density relay can be 2.5 grade.

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 signal 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.

Specifically, the electrical equipment comprises GIS, GI L, PASS, circuit breakers, current transformers, voltage transformers, gas-filled 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 self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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 a gas density monitoring device for self-testing contact resistance, 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, a gas density monitoring device for self-testing contact resistance provided by the embodiment of the present invention includes: 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 contact resistance detection unit 6B includes a relay J3(63), a constant current source 64, an amplifier 65, an a/D converter 66, and an intelligent control unit 7. When the contact signal of the density relay is operated and/or when the command for detecting the contact resistance 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 contact resistance detection unit 6B is operated, and the two pairs of normally open contacts J31 and J32 thereof are closed, so that the constant current source 64 and the contact P of the amplifier 65 and the density relay are closed_JConnected to each other by a current I generated by a constant current source 64_JSo that the contact point P of the density relay_JVoltage U is generated at two ends_JThe accurate voltage U is obtained through the processing of the amplifier 65, the A/D converter 66 and the intelligent control unit 7_JThe intelligent control unit 7 is based on R_J＝U_J/I_JThen the contact resistance R of the density relay can be detected_J. In the present embodiment, a constant current method is adopted, the resistance of the measured contact is mainly considered to be a small resistance, and in addition, in order to improve the measurement accuracy and eliminate the influence of the test lead on the measurement result, a four-wire system can be adopted for measurement. In addition, the intelligent control unit 7 adds a zeroing function on the software design and corrects the test result according to the measured error so as to further improve the contact resistance value R of the contact point_JThe measurement accuracy of (2).

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 a control loop of a contact signal of the gas density relay, and a pair of normally open contacts J13 are connected in parallel in the control loop of the contact of the gas density relay. The contact resistance detection unit 6B includes a relay J3(63), a constant current source 64, an amplifier 65, an a/D converter 66, and an intelligent control unit 7. When receiving a command for detecting the contact resistance of the contact, 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 thereof 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 in order not to affect the operation of the power grid. 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 contact resistance detection unit 6B is operated, and the two pairs of normally open contacts J31 and J32 thereof are closed, so that the constant current source 64 and the contact P of the amplifier 65 and the density relay are closed_JConnected to each other by a current I generated by a constant current source 64_JSo that the contact point P of the density relay_JVoltage U is generated at two ends_JThe accurate voltage U is obtained through the processing of the amplifier 65, the A/D converter 66 and the intelligent control unit 7_JThe intelligent control unit 7 is based on R_J＝U_J/I_JThen the contact resistance R of the density relay can be detected_J. In this embodiment, a constant current method is also used, and the measurement can be performed by using a four-wire system in order to improve the measurement accuracy and eliminate the influence of the test lead on the measurement result, mainly considering that the resistance of the contact to be measured is a small resistance. In addition, the intelligent control unit 7 is added to the software designA return-to-zero function is added, and the test result can be corrected according to the measured error so as to further improve the contact resistance R of the contact_JThe measurement accuracy of (2).

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 the Hall sensor is closed, a closed loop is electrified, and current flows between the first Hall current sensor H1 and the second Hall current sensor H2 to generate induced potential; when the contact point P is_JWhen the Hall sensor is opened, the closed loop is powered off, no current flows between the first Hall current sensor H1 and the second Hall current sensor H2, and the induced potential is zero.

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

Example 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.

First SCR1 and third SCR3 stringIn parallel, a series circuit formed by the second silicon controlled rectifier SCR2 and the fourth silicon controlled rectifier SCR4 after being connected in series and the first silicon controlled rectifier SCR1 and the third silicon controlled rectifier SCR3 forms a series-parallel closed loop; 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_JWhen 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 a contact signal 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 signal. The first SCR1 and the second SCR2 are in conduction stateState, the contact point 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 module 73(U3) may be wired, such as RS232, RS485, CAN-BUS, fiber optic Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, P L C power carrier, or wireless, such as 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, 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 (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 short circuit protection circuit, a power reverse protection circuit, an electric contact false protection circuit, a charging protection circuit, etc. the protection circuits may be one or a plurality of flexible optical disks combined to form a display and output (U. 5), a digital tube, an SD 357, an electric contact false protection circuit, a charging protection circuit, a plurality of flexible display units 3576, a plurality of flexible CD-ROM, a plurality of flexible display, a CD-ROM, a flexible CD-ROM, a plurality of flexible CD-ROM, a flexible hard-CD-ROM, a plurality of flexible hard-CD-ROM, a plurality.

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) CAN be wired, such as industrial buses like RS232, RS485 and CAN-BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, P L C power carrier waves and the like, or wireless, such as 2G/3G/4G/5G and the like, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound waves, satellites, quantum communication, sonar and the like, the display and output 75(U5) CAN be a digital tube, L ED, L CD, HMI, a display, a matrix screen, a printer, a fax, a projector, a mobile phone and the like, and CAN be formed by one or a plurality of flexible combinations.

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

In a word, after passing through an amplifying circuit, the analog pressure sensor, the temperature sensor and the micro-water sensor are converted into A/D (analog to digital) and then into MCU (micro control unit), so that the pressure, temperature and water collection is realized. The intelligent 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 self-testing contact resistance in 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 a schematic diagram of an architecture of a gas density relay system for self-testing contact resistance of a contact according to an 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 … … Z1 n, 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 monitoring terminal comprises 1) a background software platform, namely a background software key business module based on Windows, L inux and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS and MacOS, 2) a background software key business module, such as authority management, equipment management, data storage inquiry and the like, user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data acquisition, data analysis, recording conditions, exception handling and the like, and 3) interface configurations, such as Form interfaces, Web interfaces, configuration interfaces and the like.

Example twenty one:

fig. 23 is a schematic diagram of an architecture of a gas density relay system for self-testing contact resistance of a contact according to twenty-one embodiment. 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 … … Z1 n, 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 embodiment of a twenty-two gas density relay system with self-test contact resistance. 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 calibration accuracy of the gas density relay can be related to the power industry or national standard, under different temperatures, the calibration requirements can be according to the national standard or industry standard, for example, according to 4.8 temperature compensation performance regulations in D L/T259 sulfur hexafluoride gas density relay calibration regulations, the accuracy requirements corresponding to each temperature value, namely the error judgment requirements are different, the comparison and the judgment of the same period (or the same season) in different years can be carried out according to the standard or other regulations, for example, the calibration result of 5 months in 2021 can be directly compared with the calibration results of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, judgment can be carried out, the calibration can be carried out when the calibration is needed, and a mobile design can also be carried out, namely, the calibration can be carried out when a transformer substation works for a period of time, after the task is completed, the calibration can be carried out to the transformer substation B to work for a period of time, and then the calibration can be carried out to the transformer substation C.

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 at different temperatures and different time periods. 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 that self-tests contact resistance refers broadly 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. A gas density relay that self tests contact resistance, 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;

the gas density relay 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;

2. The gas density relay of claim 1, wherein the contact signal of the gas density relay is isolated from its control circuit by a contact signal isolation unit, and the contact resistance detection unit can detect the contact resistance value of the contact of the density relay when the contact signal of the density relay is activated and/or when a command for detecting the contact resistance is received.

3. The gas density relay of claim 1, wherein the gas density relay further comprises a communication module, and the detected contact resistance value of the contact of the gas density relay is remotely transmitted to a corresponding monitoring system or a target device through the communication module.

4. A gas density relay of self-testing contact resistance according to claim 1, wherein at least one temperature sensor is provided near or on or integrated into a temperature compensation element of said gas density relay.

5. The gas density relay of claim 1, further comprising a display mechanism, wherein the display mechanism comprises a movement, a pointer, and a dial, and the movement is fixed on the base or in the housing; 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.

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

7. The gas density relay of claim 6, wherein the density measuring sensor further comprises a shield for shielding an electric field and/or a magnetic field.

8. The gas density relay of claim 6, wherein the communication means of the communication module comprises a wired communication means or a wireless communication means, wherein,

the wired communication mode comprises one or more of RS232, RS485, CAN-BUS industrial BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, P L C power carrier and cable;

the wireless communication mode comprises one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.

9. The gas density relay of claim 6, wherein the intelligent processor comprises a processor formed by an integrated circuit, or a programmable controller, or an industrial personal computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.

10. The gas density relay of claim 6, wherein said density measuring 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.

11. The gas density relay of claim 1, wherein the contact resistance detection unit comprises a resistance detector, or a milliohmmeter, or a volt-ampere meter, or an ampere-potentiometer.

12. The gas density relay of claim 1, wherein the lead wire of the contact resistance detecting unit is made of two wires, three wires, or four wires.

13. The gas density relay of claim 1, wherein the contact signal isolation unit is an electrically controlled relay, or an electrically controlled miniature switch, or an optical coupler, or a controllable silicon, or a MOS field effect transistor, or a triode, or a circuit composed of a miniature switch, an electrical contact, an optical coupler, a controllable silicon, a DI, a relay, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, or a power relay.

14. The gas density relay according to claim 1, further comprising a micro water sensor for on-line monitoring of a micro water value of a gas and a gas circulation mechanism, and/or a decomposition product sensor for on-line monitoring of a decomposition product of a gas,

the gas circulation mechanism comprises a capillary tube, a sealing chamber and a heating element, the gas circulation mechanism is heated by the heating element to realize gas flow, and the gas micro-water value can be monitored on line.

15. The gas density relay according to claim 1, wherein the gas density relay further comprises an analysis system for detecting, analyzing and determining the gas density value monitoring, the electrical performance of the gas density relay and the monitoring element.

16. The gas density relay of 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.

17. The gas density relay of self-testing contact resistance of claim 1, wherein the gas density relay of self-testing contact resistance is connected with a remote background detection system sequentially through a concentrator, an IEC61850 or IEC104 protocol converter; the gas density relays of the self-test contact point resistors are respectively arranged on the corresponding electrical equipment of the insulating air chamber.

18. The gas density relay of self-testing contact resistance according to claim 17, wherein said hub is an RS485 hub, and further an IEC61850 protocol converter or an IEC104 protocol converter is connected to the network service printer and the network data router, respectively.

19. A monitoring system comprising a gas density relay of any of claims 1 to 18 which is self-testing for contact resistance of contacts; alternatively, the monitoring system comprises a gas density relay of any of claims 1 to 18 that self tests contact resistance.