CN211179407U - Gas density relay with line diagnosis function and monitoring system - Google Patents

Abstract

The application provides a gas density relay with a line diagnosis function, which comprises an intelligent processor, a line diagnosis monitoring unit and a communication module; the line diagnosis monitoring unit is connected with a line which needs to be diagnosed in the shell and is used for monitoring whether the line is normal or not; the intelligent processor is respectively connected with the line diagnosis monitoring unit and the communication module, and is used for receiving the line state information monitored by the line diagnosis monitoring unit and remotely transmitting the line state information to a corresponding detection system or target equipment through the communication module. The system realizes monitoring and rapid and efficient diagnosis of line faults such as disconnection, short circuit and the like in the gas density relay through the line diagnosis monitoring unit, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost. The application also provides a monitoring system containing the gas density relay.

Description

Gas density relay with line diagnosis function and monitoring system

Technical Field

The utility model relates to an electric power tech field especially relates to an use on high pressure, middling pressure electrical equipment, has the gas density relay and the monitoring system of circuit diagnosis function.

Background

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

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the density of the SF6 gas is reduced to a certain degreeCausing loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring of the gas density and micro-water content state of the SF6 electrical equipment has important practical significance. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high-voltage electrical equipment is very common, and existing gas density monitoring systems (devices) are basically: 1) the remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density is used for realizing the acquisition and uploading of density, pressure and temperature, and the online monitoring of the gas density is realized. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage transformer substation is severe, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and when the pressure reaches the state of alarming, locking or overpressure, information is transmitted to a target equipment terminal in time through a contact connecting circuit, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be transmitted to target equipment (such as a computer terminal) in time to realize online monitoring.

The gas density relay on the SF6 electrical equipment is regularly checked, which is a necessary measure for preventing the gas density relay from being in the bud and ensuring the safe and reliable operation of the SF6 electrical equipment; the 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the SF6 gas density relay is very important and popular in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises are implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density relay, so that the gas density relay for realizing the online gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and further regular checking work of the (mechanical) gas density relay is completed, no maintainer is required to arrive at the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro-water value in the gas chamber of the electrical equipment can be accurately measured in the online self-checking gas density relay or a monitoring system consisting of the gas density relay.

SUMMERY OF THE UTILITY MODEL

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

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

in a first aspect, the present application provides a gas density relay with line diagnostics.

In a second aspect of the present application, there is provided a monitoring system constituted by or including the gas density relay with line diagnosis function of the first aspect.

The gas density relay with the line diagnosis function comprises a shell, and a pressure detector, a temperature compensation element, at least one signal generator and an equipment connecting joint which are arranged in the shell, wherein the gas density relay is communicated with electrical equipment through the equipment connecting joint; the gas density relay further comprises: the intelligent processor, the line diagnosis monitoring unit and the communication module;

the line diagnosis monitoring unit is connected with a line which needs to be diagnosed in the shell and is used for monitoring whether the line is normal or not;

the intelligent processor is respectively connected with the line diagnosis monitoring unit and the communication module, and is used for receiving the line state information monitored by the line diagnosis monitoring unit and remotely transmitting the line state information to a corresponding detection system or target equipment through the communication module;

the line state information comprises line normality and line abnormality.

Preferably, the signal generator comprises a microswitch or a magnetically assisted electrical contact, and the gas density relay outputs a contact signal comprising an alarm, and/or a latch through the signal generator.

Preferably, the pressure detector comprises a bourdon tube or a bellows.

Preferably, the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.

Preferably, the gas density relay further comprises a density measurement sensor, and the density measurement sensor is communicated with the pressure detector on a gas path and is used for acquiring data information; the density measurement sensor is also connected with the intelligent processor, and the intelligent processor receives and/or calculates data information acquired by the density measurement sensor and transmits the data information to a corresponding monitoring system or target equipment through the communication module; wherein, the data information comprises a density value, and/or a pressure value and a temperature value.

More preferably, the density measurement sensor comprises a pressure sensor and a temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density measuring sensor using quartz tuning fork technology.

The density measuring sensor of the quartz tuning fork technology is characterized in that the constant resonance frequency of a quartz oscillator in vacuum and the resonance frequency difference of a quartz oscillator which is in a same source in measured gas are in direct proportion to the density of the measured gas, and an analog signal or a digital signal of the gas density value is obtained after processing.

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

More preferably, the gas density relay also monitors the density value of the gas in the electrical equipment communicated with the gas density relay on line, and/or the pressure value and the temperature value, so as to realize the on-line monitoring of the gas density of the electrical equipment.

Preferably, the line diagnosis monitoring unit comprises a diode, an optical coupler and a resistor.

Preferably, the line diagnostic monitoring unit comprises a current sensor, and/or a voltage sensor, and/or a current detector, and/or a voltage detector.

Preferably, the line diagnosis monitoring unit comprises a current transformer, and/or a voltage transformer.

Preferably, the line diagnosis monitoring unit comprises a thyristor, or a thyristor and a resistor, and/or a MOS field effect transistor, and/or a triode, and/or a diode.

Preferably, the line diagnosis monitoring unit comprises an electromagnetic relay, and/or an electronic relay.

Preferably, the line diagnosis monitoring unit includes one or more of a switch, an electric contact, an optical coupler, a thyristor, DI, a relay, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, a power relay, a current sensor (such as a hall current sensor, a dc current sensor, an ac current sensor), a current transformer, a voltage sensor (such as a hall voltage sensor, a dc voltage sensor, an ac voltage sensor), a voltage transformer, a current detector, a voltage detector, and a resistor.

Preferably, the gas density relay further comprises a micro water sensor, and the micro water sensor is connected with the intelligent processor and used for monitoring the gas micro water value on line.

More preferably, the gas density relay further comprises a gas circulation mechanism, the gas circulation mechanism is connected with the intelligent processor, the gas circulation mechanism comprises a capillary tube, a sealing chamber and a heating element, gas flowing is achieved by heating the heating element, and the gas micro-water value is monitored on line. Preferably, the micro water sensor can be installed in a sealed chamber, in a capillary tube, at a capillary tube opening or outside the capillary tube of the gas circulation mechanism.

Preferably, the gas density relay further comprises a decomposition product sensor for online monitoring of gas decomposition products, and the decomposition product sensor is connected with the intelligent processor.

Preferably, the gas density relay further comprises a valve, a pressure regulating mechanism and an online check contact signal sampling unit; the gas path of the pressure regulating mechanism is communicated with the pressure detector; one end of the valve is connected with the equipment connecting joint, and the other end of the valve is communicated with the pressure detector, or the other end of the valve is communicated with the pressure detector through an air passage connected with the pressure adjusting mechanism; the online check contact signal sampling unit is connected with the signal generator and is configured to sample a contact signal of the gas density relay at an ambient temperature; the valve, the pressure adjusting mechanism and the online check contact signal sampling unit are also respectively connected with the intelligent processor.

Specifically, the gas density relay is closed through an intelligent processor, so that the gas density relay is isolated 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, a contact signal generated during contact action is transmitted to the intelligent processor through the online check contact signal sampling unit, the intelligent processor detects a contact action value and/or a return value of the gas density relay according to a density value during contact action, and the check work of the gas density relay is completed online.

Preferably, the gas density relay further comprises a shielding piece which can shield an electric field and/or a magnetic field, and the shielding piece is arranged in the shell or outside the shell; or, the shielding piece is arranged on the intelligent processor and/or the communication module.

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

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

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 in the shell; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with a display of the value.

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

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

More preferably, the wireless communication mode includes, but is not limited to, one or more of a 5G/NB-IOT communication module (e.g., 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

Preferably, the gas density relay further comprises a power supply for supplying power, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable battery, or solar energy, or a power supply obtained by electricity getting from a transformer, or an induction power supply.

Preferably, the gas density relay is provided with an abnormal and timely notice. Such as a broken wire, a short alarm, a broken sensor, a tendency for gas pressure to rise, etc.

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

Preferably, the gas density relay further comprises a contact resistance detection unit, and the contact resistance detection unit is connected with the contact of the gas density relay or directly connected with the signal generator, and is used for detecting the contact resistance of the contact of the gas density relay or detecting and judging the contact resistance.

Preferably, the gas density relay is further provided with a temperature protection device for the electronic component, and the temperature protection device is used for ensuring that the electronic component can reliably work at low or high ambient temperature.

More preferably, the temperature protection device comprises a heater and/or a heat sink (e.g. a fan), the heater being switched on when the temperature is below a set value and the heat sink (e.g. a fan) being switched on when the temperature is above the set value.

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

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

1) the gas density relay with the line diagnosis function comprises an intelligent processor, a line diagnosis monitoring unit and a communication module; the line diagnosis monitoring unit is connected with a line which needs to be diagnosed in the shell and is used for monitoring whether the line is normal or not; the intelligent processor is respectively connected with the line diagnosis monitoring unit and the communication module, and is used for receiving the line state information monitored by the line diagnosis monitoring unit and remotely transmitting the line state information to a corresponding detection system or target equipment through the communication module. The system realizes monitoring and rapid and efficient diagnosis of line faults such as disconnection, short circuit and the like in the gas density relay through the line diagnosis monitoring unit, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost.

2) A monitoring system comprising the gas density relay is provided.

Drawings

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

fig. 1 is a schematic structural diagram of a gas density relay with a line diagnosis function according to a first embodiment;

fig. 2 is a schematic structural diagram of a gas density relay with a line diagnosis function according to a second embodiment;

FIG. 3 is a schematic diagram of a control circuit of a gas density relay with a line diagnosis function according to a third embodiment;

FIG. 4 is a schematic structural diagram of a gas density relay with a line diagnostic function according to a fourth embodiment;

FIG. 5 is a schematic structural diagram of a gas density relay with a line diagnostic function according to a fifth embodiment;

FIG. 6 is a schematic structural view of a gas density relay with a line diagnosis function according to a sixth embodiment;

FIG. 7 is a schematic structural view of a gas density relay with a line diagnosis function according to a seventh embodiment;

FIG. 8 is a schematic structural view of a gas density relay with a line diagnosis function according to an eighth embodiment;

FIG. 9 is a schematic structural view of a gas density relay with a line diagnosis function according to the ninth embodiment;

fig. 10 is a schematic structural view of a gas density relay with a line diagnosis function of the tenth embodiment;

FIG. 11 is a schematic structural view of a gas density relay with a line diagnosis function according to an eleventh embodiment;

FIG. 12 is a schematic structural view of a gas density relay having a line diagnosis function according to a twelfth embodiment;

FIG. 13 is a schematic structural view of a gas density relay having a line diagnosis function according to a thirteenth embodiment;

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

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

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

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

FIG. 18 is a schematic diagram of a 4-20mA type density transmitter circuit on a gas density relay;

fig. 19 is a schematic structural view of a gas density relay with a line diagnosis function of the nineteenth embodiment;

fig. 20 is an architecture diagram of a monitoring system of an embodiment twenty;

fig. 21 is a schematic diagram of an architecture of a monitoring system according to twenty-one embodiment;

fig. 22 is a schematic structural diagram of a monitoring system according to a twenty-second embodiment.

Detailed Description

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

The first embodiment is as follows:

fig. 1 is a schematic structural diagram of a gas density relay with a line diagnosis function for high and medium voltage electrical equipment according to an embodiment of the present invention. As shown in fig. 1, a gas density relay 1 with a line diagnosis function includes a housing 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 an equipment connection joint 1010, which are disposed in the housing 101. The gas density relay 1 is communicated with electrical equipment through the equipment connecting joint 1010, one end of the pressure detector 103 is fixed on the base 102 and communicated with the base 102, 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 for pushing the signal generator 109 and enabling a contact of the signal generator 109 to be connected or disconnected. 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.

The gas density relay 1 further includes: the system comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, a contact signal sampling unit 6, a line diagnosis monitoring unit (not shown in the figure) and an intelligent processor 7. One end of the valve 4 is communicated with the equipment connecting joint 1010, and the other end of the valve 4 is communicated with the base 102; the pressure sensor 2 is communicated with a pressure detector 103 on an air path; the pressure adjusting mechanism 5 is communicated with the pressure detector 103; the contact signal sampling unit 6 is respectively connected with the signal generator 109 and 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. The line diagnosis monitoring unit is connected with a line which needs to be subjected to line diagnosis in the shell 101 and used for monitoring whether the line is normal, the line diagnosis monitoring unit is connected with the intelligent processor 7, and monitored line state information (including line normality and line abnormality) is sent to the intelligent processor 7.

One end of the pressure detector 103 and one end of the temperature compensation element 104 are both fixed on the end seat 108, the other end of the pressure detector 103 is connected on the base 102, the other end of the temperature compensation element 104 is connected with the movement 105 through a display link or the other end of the temperature compensation element 104 is directly connected with the movement 105, and the pointer 106 is installed on the movement 105 and is arranged in front of the dial 107. The signal generator 109 can adopt a microswitch or a magnetic auxiliary electric contact, and the contact signal of the gas density relay is output through the signal generator 109. The pressure detector 103 may employ a bourdon tube or a bellows tube. The temperature compensation element 104 may employ a compensation plate or a gas enclosed within a housing. The utility model discloses a gas density relay can also include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge.

In this embodiment, the varying pressure and temperature are corrected based on the pressure detector 103 and by the temperature compensation element 104 to reflect the variation in the (sulphur hexafluoride) gas density. Under the pressure of the measured medium (sulfur hexafluoride) gas, due to the action of the temperature compensation element 104, when the density value of the (sulfur hexafluoride) gas changes, the pressure value of the (sulfur hexafluoride) gas also changes correspondingly, so that the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the core 105 by virtue of the temperature compensation element 104, the core 105 transmits the elastic deformation displacement to the pointer 106, the density value of the measured sulfur hexafluoride gas is indicated on the dial 107, and the signal generator 109 serves as an output alarm locking contact. The gas density relay 1 can then display the value of the (sulphur hexafluoride) gas density. If the sulfur hexafluoride gas density value is reduced, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, the pointer 106 moves towards the direction with small indicating value, the gas leakage degree is specifically displayed on the dial 107, and the signal generator 109 outputs (alarm locking) contact signals to monitor and control the sulfur hexafluoride gas density in equipment such as an electrical switch and the like, so that the electrical equipment can work safely. The valves 4 may be various and may be cut-off valves, such as ball valves, butterfly valves, gate valves, stop valves, plug valves, butterfly valves, needle valves, diaphragm valves, etc. If the ball valve is used, the self-sealing valve core can be rotated to drive the ball valve to close the air passage of the switch device, and the ball valve can be flexibly designed according to actual requirements. The valve 4 is automatic and can be verified manually or semi-manually.

Example two:

fig. 2 is a schematic structural diagram of a gas density relay with a line diagnosis function. As shown in fig. 2, includes: the 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, an air supplement interface 10 and a line diagnosis monitoring unit (not shown in the figure). 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, the line diagnosis monitoring unit 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.

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

Example three:

fig. 3 is a schematic diagram of a control circuit of a gas density relay with line diagnostics. 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 contact signal control circuit, 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 the contact signal control circuit; the second relay J2 is provided with a normally openContacts J21 and J22, the normally open contacts J21 and J22 being connected at a contact P of the gas density relay 1_JThe above step (1); the first relay J1 and the second relay J2 may be integrated into a single unit, i.e., a relay having normally open and normally closed contacts. In a non-verification state, the normally closed contacts J11 and J12 are closed, the normally open contacts J21 and J22 are opened, and the gas density relay monitors the contact P in real time_JThe output state of (1); in the verification state, the normally closed contacts J11 and J12 are opened, the normally open contacts J21 and J22 are closed, and the contact P of the gas density relay 1 is closed_JAnd the intelligent processor 7 is connected with the normally open contacts J21 and J22.

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

Then, the intelligent processor 7 controls the driving part 52 of the pressure adjusting mechanism 5 (which can be realized by mainly adopting a motor and a gear, and the way is various and flexible), and then adjusts the volume change of the pressure adjusting mechanism 5, so that the pressure of the gas density relay 1 is gradually reduced, so that the gas density relay 1 generates a contact signal action, the contact signal action is uploaded to the intelligent processor 7 through a second relay J2 of the on-line checking contact signal sampling unit 6, and the intelligent processor 7 converts the pressure value P and the temperature value T measured when the contact signal action into a pressure value P corresponding to 20 ℃ according to the gas characteristics₂₀(density value), the contact action value P of the gas density relay can be detected_D20. After the action values of the contact signals of the alarm and/or locking signals of the gas density relay 1 are all detected, the intelligent processor 7 controls the motor (motor or variable frequency motor) of the pressure adjusting mechanism 5 to adjust the pressure adjusting mechanism 5, so that the pressure of the gas density relay 1 is gradually increased, and the test result shows that the action values of the contact signals of the alarm and/or locking signals of the gas density relay 1 are all detectedAlarm of gas density relay 1 and/or return value of the latching contact signal. 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 contact signal control loop of the gas density relay 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Therefore, the online checking work of the gas density relay is conveniently completed, and the safe operation of the electrical equipment is not influenced.

After the gas density relay 1 completes the checking work, the gas density relay judges and CAN report the detection result, the mode is flexible, specifically, 1) the gas density relay CAN report the checking work locally, for example, the checking work is displayed through an indicator light, a number or a liquid crystal, 2) or the uploading is implemented through an online remote transmission communication mode, for example, the uploading CAN be carried out to a background monitoring terminal, 3) or the uploading is carried out through the wireless uploading to a specific terminal, for example, the uploading CAN be carried out wirelessly to a mobile phone, 4) or the uploading is carried out through other ways, 5) or the abnormal result is uploaded through an alarm signal line or a special signal line, 6) the uploading is carried out independently or is bound with other signals, in a word, after the gas density relay completes the online checking work of the gas density relay 1, if the abnormal state exists, the alarming CAN be sent automatically, the alarming CAN be uploaded to a remote end, or the alarming CAN be sent to a designated receiver, for example, the mobile phone, or the alarming result CAN be sent to a remote end (a monitoring room, a monitoring platform and the like) through the alarming signal of the alarming device 7, the alarming device CAN be uploaded through the networking of the alarming of the gas density relay 1 through the wireless communication of a wireless communication interface, a wireless communication module, a wireless communication.

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

The gas density relay can be checked on line according to set time, or can be checked on line according to set temperature (such as limit high temperature, limit low temperature, normal temperature, 20 degrees and the like). when the environment temperature of high temperature, low temperature, normal temperature and 20 degrees is checked on line, the error judgment requirement is different, for example, when the environment temperature of 20 degrees is checked, the accuracy requirement of the gas density relay is 1.0 grade or 1.6 grade, and the accuracy requirement of the gas density relay is 2.5 grade at high temperature.

The gas density relay 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.

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

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

Example four:

as shown in fig. 4, the gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint 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, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

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 five:

as shown in fig. 5, compared with the fourth embodiment, the present embodiment adds a gas make-up interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve 11 is communicated with the air inlet of the valve 4 and the air supplementing interface 10 through a connecting pipe.

Example six:

as shown in fig. 6, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint 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. The pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit 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 seven:

as shown in fig. 7, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint 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, the pressure regulating mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

Example eight:

as shown in fig. 8, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), 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. The pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

In contrast to the second embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of the air bag 53 and the 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 nine:

as shown in fig. 9, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent processor 7 and a multi-way joint 9. The air inlet of the valve 4 is hermetically connected to the equipment connecting joint, and the air outlet of the valve 4 is connected with the multi-way joint 9. The gas density relay 1 is arranged on the multi-way joint 9; the pressure sensor 2 is arranged on the multi-way connector 9, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay 1 on a gas path; the pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and the pressure adjusting mechanism 5 is communicated with a pressure detector of the gas density relay 1; the temperature sensor 3, the online check joint signal sampling unit 6 and the intelligent processor 7 are arranged together and arranged on the multi-way joint 9; the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

The difference from the second 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 ten:

as shown in fig. 10, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), 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, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

In contrast to the second 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 sealing member 42 sealed with the first housing 41, so that the design ensures that the valve 4 is kept sealed and can work 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 eleven:

as shown in fig. 11, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint 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, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

Example twelve:

as shown in fig. 12, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure adjusting mechanism 5, an online check joint 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 first temperature sensor 31, 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 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection terminals are connected. The first pressure sensor 21 and the pressure detector of the gas density relay 1 are communicated with the pressure regulating mechanism 5 on a gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are connected with the intelligent processor 7; the valve 4, the pressure regulating mechanism 5 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

Different from the second embodiment, there are two pressure sensors, that is, a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The second temperature sensor 32 may also be omitted in this embodiment. The pressure sensor comprises a plurality of pressure sensors and temperature sensors, and the pressure values monitored by the pressure sensors can be compared and verified with each other; the temperature values obtained by the plurality of temperature sensors can be compared and verified mutually; the corresponding gas density values obtained by monitoring the pressure sensors and the temperature sensors can be compared and verified with each other.

Example thirteen:

as shown in fig. 13, a gas density relay 1 having a line diagnosis function (the gas density relay 1 mainly includes a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection terminal provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online check joint signal sampling unit 6, an intelligent processor 7 and a multi-way joint 9. The air inlet of the valve 4 is connected to the electrical equipment in a sealing manner, and the air outlet of the valve 4 is connected with the multi-way joint 9. The valve 4 is sealed in the first shell 41, and the control cable of the valve 4 is led out through the first lead-out wire sealing member 42 sealed with the first shell 41, so that the valve 4 is ensured to keep sealed and can work reliably for a long time. The gas density relay 1 is arranged on the multi-way joint 9; the pressure regulating mechanism 5 is arranged on the multi-way joint 9. 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, the temperature sensor 3 and the line diagnosis monitoring unit are respectively connected with an intelligent processor 7.

The difference from the second 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 fourteen:

as shown in fig. 14, the online verification contact signal sampling unit 6 is provided with a contact sampling circuit. In this embodiment, the contact sampling circuit includes a photo coupler OC1 and a resistor R1, and the photo coupler OC1 includes a light emitting diode and a photo transistor; the anode of the light emitting diode and the contact point P of the gas density relay 1_JAre connected in series to form a closureA loop; the emitting electrode of the phototriode is grounded; the collector of the phototriode is used as the output end out6 of the on-line check contact signal sampling unit 6 to be connected with the intelligent processor 7, and the collector of the phototriode is also connected with a power supply through the resistor R1.

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

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

In this embodiment, the intelligent processor 7 is mainly composed of a processor 71(U1) and a power supply 72 (U2).

Example fifteen:

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 photo coupler OC1 and a second photo coupler OC 2.

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

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

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

In this embodiment, the first zener diode group includes a first zener diode D1 and a second zener diode D2 connected in series, and a cathode of the first zener diode D1 is connected to an anode of the second zener diode D2; the second zener diode group comprises a third zener diode D3 and a fourth zener diode D4 which are connected in series, and the anode of the third zener diode D3 is connected with the cathode of the fourth zener diode D4.

The contact sampling circuit can conveniently realize the contact P of the gas density relay 1_JIs monitored, and the intelligent processor 7 is combined to monitor the contact point P_JWhether the power grid is in an open state or a closed state is correspondingly processed, remote transmission is implemented, the signal state of the contact is known from a background, and the reliability of the power grid is greatly improved.

Specifically, as shown in fig. 15, the line diagnosis monitoring unit 6 mainly includes an optical coupler OC1, an optical coupler OC2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1-D4, and the like. The open or closed state of the gas density relay contact PJ can be known by this circuit. The method comprises the following steps: when the contact PJ of the gas density relay is closed, a voltage drop exists between the diode D1-D2 or the diode D3-D4, the optical coupler OC1 and/or the optical coupler OC2 are triggered to be conducted, and the high level exists at the OUT6 position. On the contrary, when the contact PJ of the gas density relay is disconnected, no voltage drop exists between the diode D1-D2 or the diode D3-D4, the optical coupler OC1 and/or the optical coupler OC2 are not conducted, and the position OUT6 is at a low level. This makes it possible to know whether the gas density relay contact PJ is in a normal or abnormal state. And the intelligent processor 7 is combined to correspondingly process the normal or abnormal state of the gas density relay contact PJ and upload the state. Therefore, the gas density relay can conveniently monitor the state of the contact signal PJ of the remote transmission gas density relay and remotely transmit the state of the contact signal PJ. The contact signal state of the gas density relay can be known in the background: normal or abnormal state, thereby having one more layer of monitoring and improving the reliability.

In this embodiment, the intelligent processor 7 is mainly composed of a processor 71(U1) and a power supply 72 (U2).

Example sixteen:

as shown in fig. 16, 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), a data storage 76(U6), 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 module 73(U3) may be wired, such as RS232, RS485, CAN-BUS, optical fiber 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, quantum communication, sonar, etc. the display and output 75(U5) may be a digital tube, L ED, L CD, HMI, display, matrix screen, printer, fax, projector, mobile phone, etc., and may be one or several flexibly combined together, the data storage 76(U6) may be F L ASH, RAM, ROM, hard disk, SD, etc., magnetic tape, punched paper tape, optical disk, U disk, film, flash memory card, etc., and may be one or several flexibly combined together.

Example seventeen:

as shown in fig. 17, 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. 18 is a schematic diagram of a 4-20mA type density transmitter circuit on a gas density relay. As shown in fig. 18, the 4-20Ma type density transmitter is mainly composed of 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, and a voltage reduction module. 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. 19 is a schematic structural diagram of a gas density relay with a line diagnostic function according to nineteenth embodiment of the present application. As shown in fig. 19, the gas density relay 1 (mainly including a housing, and a base, a pressure detector, a temperature compensation element, a movement, a pointer, a dial, an end seat, a plurality of signal generators, and an electrical equipment connection joint provided in the housing) includes: the system comprises a line diagnosis monitoring unit (not shown in the figure), 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. 20 is a schematic diagram of an architecture of a monitoring system. As shown in fig. 20, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of gas density relays are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. Wherein, each gas density relay is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber. In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of gas density relays, such as a HUB1 connected with gas density relays Z11, Z12 and … … Z1n, a HUB2 connected with gas density relays Z21, Z22, … … Z2n and … …, and a HUB m connected with gas density relays Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

The background 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. 21 is a schematic diagram of an architecture of a monitoring system. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the twelfth embodiment. In this embodiment, the background monitor terminal PC connects two integrated application servers 1, Server2 through network switch Gateway, two integrated application servers 1, Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2, … … ProCn) through station control layer a network and B network, and protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2, … … bm) through R5485 network. Each HUB is connected with a group of gas density relays, such as a HUB1 connected with gas density relays Z11, Z12 and … … Z1n, a HUB2 connected with gas density relays Z21, Z22, … … Z2n and … …, and a HUB m connected with gas density relays Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

Example twenty two:

FIG. 22 is a schematic diagram of a monitoring system. The embodiment is a schematic diagram of a wireless transmission mode, and a dashed box in the diagram indicates that the wireless module Wn and the 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 with a line diagnosis function), a spacer layer (a data transmission and acquisition processing layer), and a station control layer (a monitoring host, a database server and the like), wherein the whole system adopts an IEC61850 standard 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 with the line diagnosis function has the advantages that the check precision can reach 20 degrees and is 0.25 grade, the check precision can reach 0.625 grade at high temperature or low temperature, the check precision meets the requirements, and the requirements or related specifications are met economically and quantitatively.

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 (25)

1. A gas density relay with a line diagnosis function comprises a shell, a pressure detector, a temperature compensation element, at least one signal generator and an equipment connecting joint, wherein the pressure detector, the temperature compensation element, the at least one signal generator and the equipment connecting joint are arranged in the shell; the method is characterized in that: the gas density relay further comprises: the intelligent processor, the line diagnosis monitoring unit and the communication module;

the line diagnosis monitoring unit is connected with a line which needs to be diagnosed in the shell and is used for monitoring whether the line is normal or not;

the intelligent processor is respectively connected with the line diagnosis monitoring unit and the communication module, and is used for receiving the line state information monitored by the line diagnosis monitoring unit and remotely transmitting the line state information to a corresponding detection system or target equipment through the communication module;

the line state information comprises line normality and line abnormality.

2. A gas density relay with line diagnostic function according to claim 1, characterized in that: the signal generator comprises a microswitch or a magnetic auxiliary electric contact, the gas density relay outputs a contact signal through the signal generator, and the contact signal comprises an alarm and/or a lock; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.

3. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a density measuring sensor which is communicated with the pressure detector on a gas path and is used for acquiring data information; the density measurement sensor is also connected with the intelligent processor, and the intelligent processor receives and/or calculates data information acquired by the density measurement sensor and transmits the data information to a corresponding monitoring system or target equipment through the communication module; wherein, the data information comprises a density value, and/or a pressure value and a temperature value.

4. A gas density relay with line diagnostic function according to claim 3, characterized in that: the density measurement sensor comprises a pressure sensor and a temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density measuring sensor using quartz tuning fork technology.

5. The gas density relay with line diagnosis function according to claim 4, wherein: at least one of the temperature sensors is disposed adjacent to, on, or integrated in a temperature compensation element of the gas density relay.

6. The gas density relay with line diagnosis function according to claim 5, wherein: at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay, which is close to the temperature compensation element.

7. A gas density relay with line diagnostic function according to claim 3, characterized in that: the gas density relay also monitors the density value of gas in the electrical equipment communicated with the gas density relay on line, and/or the pressure value and the temperature value, so that the gas density of the electrical equipment is monitored on line.

8. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises a diode, an optical coupler and a resistor.

9. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises a current sensor, and/or a voltage sensor, and/or a current detector, and/or a voltage detector.

10. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises a current transformer and/or a voltage transformer.

11. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises a controllable silicon or a controllable silicon and a resistor, and/or an MOS field effect transistor, and/or a triode, and/or a diode.

12. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises an electromagnetic relay and/or an electronic relay.

13. A gas density relay with line diagnostic function according to claim 1, characterized in that: the line diagnosis monitoring unit comprises one or more of a switch, an electric contact, an optical coupler, a silicon controlled rectifier, a DI (direct current), a relay, an MOS (metal oxide semiconductor) field effect transistor, a triode, a diode, an MOS FET (metal oxide semiconductor) relay, a solid state relay, a time relay, a power relay, a current sensor, a current transformer, a voltage sensor, a voltage transformer, a current detector, a voltage detector and a resistor.

14. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay further comprises a micro water sensor, and the micro water sensor is connected with the intelligent processor and used for monitoring the gas micro water value on line.

15. A gas density relay with line diagnostic function as claimed in claim 14, characterized in that: the gas density relay further comprises a gas circulation mechanism, the gas circulation mechanism is connected with the intelligent processor, the gas circulation mechanism comprises a capillary tube, a sealing chamber and a heating element, gas flow is achieved through heating of the heating element, and the gas micro-water value is monitored on line.

16. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a decomposition product sensor for monitoring gas decomposition products on line, and the decomposition product sensor is connected with the intelligent processor.

17. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a valve, a pressure regulating mechanism and an online check contact signal sampling unit; the gas path of the pressure regulating mechanism is communicated with the pressure detector; one end of the valve is connected with the equipment connecting joint, and the other end of the valve is communicated with the pressure detector, or the other end of the valve is communicated with the pressure detector through an air passage connected with the pressure adjusting mechanism; the online check contact signal sampling unit is connected with the signal generator and is configured to sample a contact signal of the gas density relay at an ambient temperature; the valve, the pressure adjusting mechanism and the online check contact signal sampling unit are also respectively connected with the intelligent processor.

18. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a shielding piece which can shield an electric field and/or a magnetic field, and the shielding piece is arranged in the shell or outside the shell; or, the shielding piece is arranged on the intelligent processor and/or the communication module.

19. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed in the shell; one end of the temperature compensation element is also connected with the movement through a connecting rod or directly connected with the movement; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or

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

20. A gas density relay with line diagnostic function according to claim 1, characterized in that: the communication mode of the communication module is a wired communication mode or a wireless communication mode;

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

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

21. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay further comprises a power supply for supplying power, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable battery, or solar energy, or a mutual inductor for getting power, or an induction power supply.

22. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay is provided with an abnormal and timely notice.

23. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay also comprises a contact resistance detection unit, wherein the contact resistance detection unit is connected with the contact of the gas density relay or directly connected with the signal generator and is used for detecting the contact resistance of the contact of the gas density relay or detecting and judging the contact resistance.

24. A gas density relay with line diagnostic function according to claim 1, characterized in that: the gas density relay is also provided with a temperature protection device for the electronic components, and the temperature protection device is used for ensuring that the electronic components can reliably work at low or high environmental temperature; the temperature protection device comprises a heater and/or a radiator, wherein the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.

25. A monitoring system, comprising: the monitoring system is composed of a gas density relay with a line diagnosis function as claimed in any one of claims 1 to 24; alternatively, the monitoring system comprises a gas density relay with line diagnostic functionality as claimed in any one of claims 1 to 24.

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