CN111029211B - Transformation method of gas density relay - Google Patents

Abstract

The present application provides a method for transforming a gas density relay, which is used for high-voltage and medium-voltage electrical equipment. A gas density detection sensor, a gas circuit blocking pressure regulating mechanism, an on-line calibration contact signal sampling unit and Intelligent control unit. Through the intelligent control unit, the movement of the partition member of the gas circuit blocking pressure regulating mechanism is controlled to cut off the gas path connection between the first interface and the second interface. At the same time, the volume of the sealed cavity changes, and the gas pressure of the gas density relay body decreases slowly, so that the contact action occurs. , the contact action is transmitted to the intelligent control unit through the online verification of the contact signal sampling unit, and the intelligent control unit detects the alarm and/or locks the contact signal action value and/or return value according to the density value of the contact action. The verification can be completed, which greatly improves the reliability and efficiency of the power grid and reduces the cost. In particular, no electric control valve is required, which makes the sealing performance better and the volume smaller.

Description

A kind of transformation method of gas density relay

technical field

The invention relates to the field of electric power technology, in particular to a method for reforming a gas density relay applied to high-voltage and medium-voltage electrical equipment.

Background technique

At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in the power sector, industrial and mining enterprises, and has promoted the rapid development of the power industry. In recent years, with the rapid economic development, the capacity of my country's power system has expanded rapidly, and the amount of SF6 electrical equipment is increasing. The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment is reduced and the micro-water content exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment: 1) The density of SF6 gas is reduced to a certain extent Will result in the loss of insulation and arc extinguishing performance. 2) With the participation of some metals, SF6 gas can undergo hydrolysis reaction with water at high temperature above 200°C to generate active HF and SOF ₂ , corrode insulating parts and metal parts, and generate a lot of heat, which increases the pressure of the gas chamber. high. 3) When the temperature is lowered, too much moisture may form condensation water, which will significantly reduce the insulating strength of the surface of the insulating parts, or even flash over, causing serious harm. Therefore, the power grid operation regulations mandate that the density and water content of SF6 gas must be regularly tested before and during the operation of the equipment.

With the development of unattended substations towards networking and digitization and the increasing requirements for remote control and telemetry, the online monitoring of gas density and micro-water content of SF6 electrical equipment is of great practical significance. With the continuous and vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important part and key node of smart substations, plays a pivotal role in the security of smart grids. Most of the high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as leakage, etc.), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, it is very common to monitor the gas density value in SF6 high-voltage electrical equipment online, so the application of gas density monitoring system (gas density relay) will flourish. The current gas density monitoring system (gas density relay) is basically: 1) The remote transmission SF6 gas density relay is used to collect and upload the density, pressure and temperature to realize the online monitoring of gas density. 2) The gas density transmitter is used to collect and upload the density, pressure and temperature to realize the online monitoring of gas density. SF6 gas density relay is the core and key component. However, due to the harsh operating environment of the high-voltage substation, especially the strong electromagnetic interference, in the currently used gas density monitoring system (gas density relay), the remote transmission type SF6 gas density relay is composed of mechanical density relay and electronic remote transmission. In addition, the traditional mechanical density relay is still retained in the power grid system where the gas density transmitter is applied. The mechanical density relay has one, two or three sets of mechanical contacts, which can transmit the information to the target equipment terminal through the contact connection circuit in time when the pressure reaches the state of alarm, blocking or overpressure, so as to ensure the safe operation of the equipment. At the same time, the monitoring system is also equipped with a safe and reliable circuit transmission function, which establishes an effective platform for realizing real-time data remote data reading and information monitoring, and can transmit information such as pressure, temperature, density, etc. to the target equipment (usually computer terminals) in time. Realize online monitoring.

Regular inspection of gas density relays on electrical equipment is a necessary measure to prevent problems before they occur and ensure the safe and reliable operation of electrical equipment. Both "Electric Power Preventive Test Regulations" and "Twenty-Five Key Requirements for Preventing Major Accidents in Electric Power Production" require regular calibration of gas density relays. From the point of view of actual operation, regular calibration of gas density relay is one of the necessary means to ensure the safe and reliable operation of power equipment. Therefore, at present, the verification of gas density relays has been paid great attention and popularized in the power system, and all power supply companies, power plants, and large-scale factories and mines have implemented them. Power supply companies, power plants, large factories and mines need to be equipped with testers, equipment vehicles and high-value SF6 gas to complete the on-site verification and testing of gas density relays. Including the loss of power outages during testing, roughly calculated, the annual testing cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the inspection personnel do not operate in a standardized manner, there are still potential safety hazards. For this reason, it is very necessary to innovate in the existing gas density self-calibration gas density relays, especially the gas density on-line self-calibration gas density relays or systems, so as to realize the gas density relay or the composition monitoring of the gas density on-line monitoring. The system also has the verification function of the gas density relay, and then completes the regular verification of the (mechanical) gas density relay, without the need for maintenance personnel to go to the site, which greatly improves the work efficiency and reduces the cost. In order to eliminate the need for electronically controlled valves, make it better in sealing performance, smaller in size, improve reliability, and facilitate popularization and application, new innovations are required.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a modification method of a gas density relay to solve the problems raised in the above technical background.

To achieve the above object, the present invention adopts the following technical solutions:

A method for reforming a gas density relay, comprising:

Connect the gas density detection sensor with the gas density relay body;

The gas circuit of the gas density relay body is connected to the first interface of the gas circuit blocking pressure regulating mechanism; the gas circuit blocking pressure regulating mechanism is also provided with a second interface which is communicated with the electrical equipment, and the gas circuit blocking pressure regulating mechanism is also provided. The adjusting mechanism is used to cut off the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action;

connecting the online verification contact signal sampling unit with the gas density relay body directly or indirectly, and the online verification contact signal sampling unit samples the contact signal of the gas density relay body;

Connect the intelligent control unit with the gas density detection sensor, the gas circuit blocking pressure regulating mechanism and the online verification contact signal sampling unit, respectively, to complete the control of the gas blocking pressure regulating mechanism, and collect the pressure value. and temperature value acquisition, and/or gas density value acquisition, and detection of the contact signal action value and/or contact signal return value of the gas density relay body;

Wherein, the contact signal includes alarm and/or block.

Preferably, the gas density detection sensor, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

The gas density detection sensor, the on-line calibration contact signal sampling unit and the intelligent control unit are arranged on the gas circuit blocking pressure regulating mechanism; the gas circuit blocking pressure regulating mechanism is arranged on the gas density relay body on; or,

The gas density detection sensor, the gas circuit blocking pressure regulating mechanism, the online verification contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

The gas density detection sensor is arranged on the gas density relay body; or,

The gas density detection sensor is arranged on the gas path blocking pressure regulating mechanism; or,

The gas density relay body is arranged on the gas circuit blocking pressure regulating mechanism; or,

The on-line verification contact signal sampling unit and the intelligent control unit are arranged on the air circuit blocking pressure regulating mechanism.

Preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or, the gas density relay body and the gas density detection sensor are of an integrated structure of a remote gas density relay.

Preferably, the gas density detection sensor is an integrated structure; or, the gas density detection sensor is a gas density transmitter of an integrated structure.

More preferably, the on-line calibration point signal sampling unit and the intelligent control unit are arranged on the gas density transmitter.

Preferably, the online verification contact signal sampling unit and the intelligent control unit are arranged together; preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or casing.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is used; or, a density detection sensor using quartz tuning fork technology.

More preferably, the pressure sensor is installed on the gas circuit of the gas density relay body or on the gas circuit blocking pressure regulating mechanism; the temperature sensor is installed on the gas circuit or outside the gas circuit of the gas density relay body, Or inside the gas density relay body, or outside the gas density relay body.

Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor, and completes the pairing of the gas density relay. On-line monitoring of gas density of monitored electrical equipment.

Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal action or switching occurs on the gas density relay body, and completes the online verification of the gas density relay; or,

The intelligent control unit acquires the pressure value and temperature value collected by the gas density detection sensor when the contact signal action or switching occurs on the gas density relay body, and converts them into a pressure value corresponding to 20°C according to the gas pressure-temperature characteristic, That is, the gas density value, completes the online verification of the gas density relay.

Preferably, the gas density relay body is provided with a comparison density value output signal, and the comparison density value output signal is connected to the intelligent control unit; or, the gas density relay body is provided with a comparison pressure value output signal , the comparison pressure value output signal is connected with the intelligent control unit.

Preferably, the air circuit blocking pressure regulating mechanism includes a sealing cavity and a blocking member in the sealing cavity, and both the first interface and the second interface are provided on the wall of the sealing cavity, and are connected with the sealing cavity. The internal space of the gas density relay body is communicated; the partition member is configured to block the gas path between the first interface and the second interface, and to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body has a contact point signal action.

More preferably, the air circuit blocking pressure regulating mechanism further comprises a connecting piece and a driving part, and the blocking piece is connected with the driving part through the connecting piece; or,

The integrated design of the partition part and the connecting part is directly connected with the driving part; or,

The partition is associated with the drive part by magnetic coupling;

Wherein, preferably, the drive components include, but are not limited to, magnetic force, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure making pump , booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic components, magnetic coupling thrust mechanism, heating generating thrust mechanism, electric heating generating thrust mechanism, and chemical reaction generating thrust mechanism.

Further, one end of the sealed cavity is provided with a fifth interface, one end of the connecting member is connected to the blocking member, and the other end is connected to the driving component through the fifth interface.

Further, the first interface is closer to the fifth interface than the second interface, or the first interface is farther from the fifth interface than the second interface.

Further, the air circuit blocking pressure regulating mechanism further includes a seal connecting piece, the seal connecting piece is arranged at the fifth interface of the sealing cavity, and the other end of the connecting piece passes through the seal connecting piece It is connected with the driving component; preferably, the seal coupling includes, but is not limited to, one of a bellows, an airbag, and a sealing ring.

One end of the above-mentioned seal coupling member is sealedly connected to the fifth interface, and the other end is sealedly connected to the driving end of the driving component, or the other end of the sealing member is sealed and wrapped in the sealing coupling member.

Further, the sealing cavity is a retractable cavity, the driving component is located in the sealing cavity, and is provided with driving ends in two directions; the connecting piece includes a first connecting piece and a second connecting piece, are respectively connected to the driving ends in two directions; wherein, the other end of the first connecting piece is connected to the inner wall of the sealing cavity; the other end of the second connecting piece is connected to the partition piece, and the partition piece is provided with perforations to seal The inside of the cavity is communicated with the second interface, a sealing member is provided on the side of the partition member facing the second interface, and the sealing member is arranged around the through hole.

Further, the seal is two seal rings, and the through hole is located between the two seal rings.

Further, the two driving ends face opposite directions.

Further, the first interface is connected to the gas density relay body through a connecting tube (preferably a capillary tube).

Further, the first connector is connected to the end of the sealed cavity provided with the first interface in a direction away from the second connector.

Furthermore, the sealed cavity is provided with a fixed point whose position cannot be changed, and the driving component is installed or connected on the fixed point.

Further, during verification, the partition member of the gas path blocking pressure adjustment mechanism is driven by the driving component to move, the partition member blocks the gas path connection between the first interface and the second interface, and the gas in the sealed cavity is moved. The pressure changes with the position of the partition, and is used to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates a contact signal action.

More preferably, the edge of the partition member is in sealing contact with the inner wall of the sealing cavity; preferably, the partition member includes, but is not limited to, one of a piston and a sealing partition.

Preferably, the gas circuit blocking pressure regulating mechanism is sealed in a cavity or housing.

Preferably, the on-line calibration contact signal sampling unit includes an isolation sampling element, and the isolation sampling element is controlled by the gas density relay body, the gas circuit blocking pressure regulating mechanism, or the intelligent control unit; in the non-calibration state, the The online verification contact signal sampling unit is relatively isolated on the circuit through the isolation sampling element and the contact of the gas density relay body; in the verification state, the online verification contact signal sampling unit cuts off the contact signal of the gas density relay body through the isolation sampling element a control loop, connecting the contacts of the gas density relay body with the intelligent control unit; preferably, the isolation sampling element includes, but is not limited to, a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic One of relays, optocouplers, and thyristors.

Preferably, the method for transforming a gas density relay further includes:

The gas density relay body and the gas circuit blocking pressure regulating mechanism are arranged on the multi-way joint; or,

The air circuit blocking pressure regulating mechanism is fixed on the multi-way joint; or,

The gas density relay body, the gas density detection sensor, and the gas circuit blocking pressure regulating mechanism are arranged on the multi-way joint.

More preferably, the method for reforming a gas density relay further includes: setting a gas supply port on the gas circuit blocking pressure regulating mechanism; or, setting a gas supply port on the electrical equipment; An air supply port is provided on the multi-port connector.

Preferably, the method for reforming a gas density relay further comprises: the gas circuit blocking pressure regulating mechanism is further provided with a third interface, and one end of the valve is connected to the third interface of the gas circuit blocking pressure regulating mechanism, The other end of the valve is directly or indirectly connected with an electrical device; the first port is located between the second port and the third port.

More preferably, the valve is an electric valve, or a solenoid valve.

Further, the valve is a permanent magnet solenoid valve.

More preferably, the valve is a piezoelectric valve, or a temperature-controlled valve, or a novel valve made of intelligent memory material and opened or closed by electric heating.

More preferably, the valve is closed or opened by bending or flattening the hose.

More preferably, the valve is sealed within a cavity or housing.

More preferably, the method for reforming a gas density relay further comprises: installing a self-sealing valve between the multi-port joint and the valve; or installing the valve between the multi-port joint and the self-sealing valve between the valves.

Preferably, the method for reforming a gas density relay further comprises: connecting a micro-water sensor with the gas density relay body and the intelligent control unit, respectively, and/or connecting a decomposition product sensor with the gas The density relay body is connected with the intelligent control unit.

More preferably, the method for reforming a gas density relay further includes: connecting a gas circulation mechanism with the gas density relay body and the intelligent control unit, respectively, and the gas circulation mechanism includes a capillary tube, a sealed chamber, and a capillary tube. and heating elements.

Further, the micro-water sensor can be installed in the sealed chamber of the gas circulation mechanism, in the capillary tube, at the capillary tube port, and outside the capillary tube.

Preferably, the method for reforming a gas density relay further comprises: arranging a temperature adjustment mechanism inside or outside the casing of the gas density relay body, the temperature adjustment mechanism being an adjustable temperature adjustment mechanism, and adjusting the temperature adjustment mechanism. The temperature of the temperature compensating element of the gas density relay body rises and falls, and then cooperates with or/and combines with the gas circuit blocking pressure regulating mechanism, so that the gas density relay body generates a contact signal action; the intelligent control unit is connected with the temperature regulating mechanism. connected to complete the control of the temperature adjustment mechanism.

More preferably, the temperature adjustment mechanism is a heating element; or,

The temperature adjustment mechanism includes a heating element, a heat preservation member, a temperature controller, a temperature detector, and a temperature adjustment mechanism housing; or,

The temperature adjustment mechanism includes a heating element and a temperature controller; or,

The temperature adjustment mechanism includes a heating element, a heating power regulator and a temperature controller; or,

The temperature adjustment mechanism includes a heating element, a cooling element, a power conditioner and a temperature controller; or,

The temperature adjustment mechanism includes a heating element, a heating power regulator and a thermostatic controller; or,

The temperature adjustment mechanism includes a heating element, a controller, and a temperature detector; or,

The temperature adjustment mechanism is a heating element, and the heating element is arranged near the temperature compensation element; or,

The temperature adjustment mechanism is a miniature incubator;

Wherein, the number of the heating element is at least one, and the heating element includes, but is not limited to, one of a silicone rubber heater, a resistance wire, an electric belt, an electric heating rod, a hot air blower, an infrared heating device, and a semiconductor;

The temperature controller, connected to the heating element, is used to control the heating temperature of the heating element. The temperature controller includes, but is not limited to, a PID controller, a controller combining PID and fuzzy control, a frequency conversion controller, and a PLC. One of the controllers.

Preferably, the method for reforming a gas density relay further comprises: connecting at least two gas density relay bodies, at least two gas circuit blocking pressure regulating mechanisms, at least two online calibration contact signal sampling units and an intelligent control unit and a gas density detection sensor to complete the online verification of the gas density relay; or,

Connect at least two gas density relay bodies, at least two gas circuit blocking pressure adjustment mechanisms, at least two online calibration contact signal sampling units, at least two intelligent control units and a gas density detection sensor to complete the gas density On-line verification of relays; or,

Connect at least two gas density relay bodies, at least two gas circuit blocking pressure regulating mechanisms, at least two online calibration contact signal sampling units, at least two gas density detection sensors and an intelligent control unit to complete the gas density Online verification of relays.

Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor.

Specifically, the pressure sensor can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor; it can be a diffusion silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a Baden pressure sensor) pressure sensor with an induction coil attached to the tube), resistance pressure sensor (such as a pressure sensor with a sliding wire resistance attached to a Baden tube); it can be an analog pressure sensor or a digital pressure sensor; the temperature sensor can be a thermocouple, Thermistor, semiconductor type; can be contact and non-contact; can be thermal resistance and thermocouple.

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

Further, when the pressure sensor is an absolute pressure sensor, it is represented by an absolute pressure value, and its calibration result is a corresponding absolute pressure value of 20°C, which is represented by a relative pressure value, and the calibration result is converted into a corresponding 20°C. ℃ relative pressure value; when the pressure sensor is a relative pressure sensor, it is expressed by relative pressure value, and its calibration result is the corresponding relative pressure value at 20℃, expressed as absolute pressure value, and its calibration result is converted into The corresponding absolute pressure value at 20°C; the conversion relationship between the absolute pressure value and the relative pressure value is:

P _{absolute pressure} = P _{relative pressure} + P _{standard atmospheric pressure} .

Preferably, the intelligent control unit obtains the gas density value collected by the gas density detection sensor; or, the intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor, and completes the pairing of the gas density relay. The on-line monitoring of the gas density is to complete the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay.

More preferably, the intelligent control unit adopts the mean value method (mean value method) to calculate the gas density value, and the mean value method is: within a set time interval, set the collection frequency, Calculate the average value of the N gas density values at the point to obtain the gas density value; or, in the set time interval, set the temperature interval step size, and correspond to the N different temperature values collected in the entire temperature range. Calculate the average value of the density value of the gas to obtain its gas density value; or, in the set time interval, set the pressure interval step size, and collect the density values corresponding to N different pressure values collected in the entire pressure variation range. The average value calculation process is performed to obtain its gas density value; wherein, N is a positive integer greater than or equal to 1.

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

Preferably, the electrical equipment includes SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulating gas electrical equipment.

Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, transformers, gas-filled cabinets, and ring network cabinets.

Preferably, the sampling of the contact signal of the gas density relay body by the on-line verification contact signal sampling unit satisfies: the on-line verification contact signal sampling unit has at least two independent sets of sampling contacts, which can simultaneously measure at least two contacts The calibration is completed automatically, and continuous measurement is required without changing contacts or re-selecting contacts; among them,

The contacts include, but are not limited to, one of an alarm contact, an alarm contact + a blocking contact, an alarm contact + a blocking 1 contact + a blocking 2 contact, an alarm contact + a blocking contact + an overpressure contact.

Preferably, the test voltage of the contact signal sampling unit for on-line verification of the contact signal action value or its switching value of the gas density relay body is not lower than 24V, that is, during verification, it is applied between the corresponding terminals of the contact signal. Not lower than 24V voltage.

Preferably, the intelligent control unit is based on a microprocessor-based embedded system with embedded algorithms and control programs, and automatically controls the entire calibration process, including all peripherals, logic, and input and output.

More preferably, the intelligent control unit automatically controls the entire system based on embedded algorithms and control programs such as general-purpose computers, industrial computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, etc., industrial control mainboards, embedded main control boards, etc. The verification process, including all peripherals, logic, and input and output.

Preferably, the intelligent control unit has an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with the host computer, and/or input simulation Quantitative and digital information.

Preferably, the modified gas density relay supports the input of basic information of the gas density relay, and the basic information includes one or more of factory serial numbers, accuracy requirements, rated parameters, manufacturer, and operating position.

Preferably, the intelligent control unit further includes a communication module for realizing long-distance transmission of test data and/or verification results.

More preferably, the communication mode of the communication module is wired communication or wireless communication.

Further, the wired communication method includes one or more of RS232 bus, RS485 bus, CAN-BUS bus, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, and cable.

Further, the wireless communication method includes one or one of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar. several.

Preferably, the intelligent control unit is further provided with a clock, and the clock is configured to periodically set the verification time of the gas density relay body, or record the test time, or record the event time.

Preferably, the control of the intelligent control unit is controlled by on-site control, and/or by background control.

More preferably, the gas density relay completes the online verification of the gas density relay body according to the settings or instructions of the background; or,

According to the set calibration time of the gas density relay body, the online calibration of the gas density relay body is completed.

Preferably, the method for transforming a gas density relay further includes: connecting a display interface for human-computer interaction with the intelligent control unit, displaying current verification data in real time, and supporting data input.

Preferably, the method for reforming a gas density relay further includes: in the gas density relay body, and/or the gas density detection sensor, and/or the gas circuit blocking pressure regulating mechanism, and/or A camera for monitoring is installed on the on-line verification contact signal sampling unit and/or the intelligent control unit.

Preferably, the gas density relay body includes: a housing, a base, a pressure detector, a temperature compensation element, and a plurality of signal generators arranged in the housing; the first interface of the multi-way connector is connected to the The base is communicated; the on-line calibration contact signal sampling unit is connected with the signal generator;

Wherein, the signal generator includes a micro switch or a magnetically assisted electrical contact, and the gas density relay body outputs a contact signal through the signal generator; the pressure detector includes a Baden tube or a bellows; the temperature The compensation element adopts the temperature compensation sheet or the gas enclosed in the shell.

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

More preferably, the gas density relay body further includes a display mechanism, the display mechanism includes a movement, a pointer and a dial, the movement is fixed on the base or in the casing; one end of the temperature compensation element It is also connected to the movement through a connecting rod or directly connected to the movement; the pointer is installed on the movement and is set before the dial, and the pointer displays the gas density value in combination with the dial ;and / or

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

More preferably, the gas density relay also includes a contact resistance detection unit; the contact resistance detection unit is connected with the contact signal or directly with the signal generator; under the control of the online verification contact signal sampling unit, the gas density The contact signal of the relay body is isolated from its control loop. When the contact signal is actuated, and/or when receiving an instruction to detect the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the gas density relay body.

The contact resistance detection unit can also be set at other places such as the online verification contact signal sampling unit, and can be set flexibly according to local conditions.

More preferably, the gas density relay also includes an insulation resistance detection unit; the insulation resistance detection unit is connected with the contact signal or directly with the signal generator; under the control of the online verification contact signal sampling unit, the gas density The contact signal of the relay is isolated from its control circuit. When the contact signal of the gas density relay is activated, and/or when receiving an instruction to detect the contact insulation resistance, the insulation resistance detection unit can detect the contact insulation resistance value of the gas density relay.

Compared with the prior art, the technical scheme of the present invention has the following beneficial effects:

The present application provides a method for transforming a gas density relay, which is used for high-voltage and medium-voltage electrical equipment. A gas density detection sensor, a gas circuit blocking pressure regulating mechanism, an on-line calibration contact signal sampling unit and Intelligent control unit. The air circuit blocking pressure regulating mechanism is controlled by the intelligent control unit, and the blocking member of the gas blocking pressure regulating mechanism moves under the action of the driving component, and the blocking member blocks the gas path connection between the first interface and the second interface, and is connected with the air circuit. With the movement of the partition, the volume of the sealed cavity changes, which can adjust the pressure of the gas density relay body, so that the gas pressure slowly drops or rises, so that the gas density relay body has a contact action or reset, and the contact action or reset. The contact signal sampling unit is transmitted to the intelligent control unit through online verification, and the intelligent control unit detects the alarm and/or latching contact signal action value and/or return value of the gas density relay body according to the density value of the contact action, without maintenance personnel The calibration of the gas density relay can be completed at the scene, which improves the reliability of the power grid, improves the efficiency, reduces the cost, and can realize the maintenance-free of the gas density relay. At the same time, the whole calibration process realizes zero emission of SF ₆ gas, which meets the requirements of environmental protection regulations. In particular, no electric control valve is needed, which makes the sealing performance better and the volume smaller, which is convenient for on-site modification, improves reliability, and is conducive to popularization and application.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

Fig. 1 is the structural schematic diagram of the gas density relay of the first embodiment when working;

2 is a schematic structural diagram of the gas density relay of the first embodiment during online verification state;

3 is a schematic circuit diagram of the gas density relay of the first embodiment;

4 is a schematic structural diagram of the gas density relay of the second embodiment;

5 is a schematic structural diagram of the gas density relay of the third embodiment;

6 is a schematic structural diagram of the gas density relay of the fourth embodiment;

7 is a schematic structural diagram of a gas density relay body of a preferred embodiment;

8 is a schematic structural diagram of the gas density relay of the fifth embodiment;

9 is a schematic structural diagram of the gas density relay of the sixth embodiment;

FIG. 10 is a schematic structural diagram of the gas density relay of the seventh embodiment.

Detailed ways

In order to make the objectives, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

A method for reforming a gas density relay, comprising: connecting a gas density detection sensor (2, 3) with a gas density relay body 1; connecting a gas circuit of the gas density relay body 1 to a gas circuit blocking pressure regulating mechanism The first interface 506 of 5; the air circuit blocking pressure regulating mechanism 5 is also provided with a second interface 507 that communicates with the electrical equipment 8, and the gas circuit blocking pressure regulating mechanism 5 blocks the first interface 506 and the second interface 507 and adjust the pressure rise and fall of the gas density relay body 1, so that the gas density relay body 1 generates a contact signal action; the online verification contact signal sampling unit 6 is directly or Indirectly connected, the online verification contact signal sampling unit 6 samples the contact signal of the gas density relay body 1; the intelligent control unit 7 is respectively connected with the gas density detection sensor (2, 3), the gas circuit The isolation pressure regulating mechanism 5 is connected with the on-line verification contact signal sampling unit 6 to complete the control of the gas circuit isolation pressure regulating mechanism 5, the pressure value acquisition and temperature value acquisition, and/or gas density value acquisition, and detection The contact signal action value and/or the contact signal return value of the gas density relay body 1; wherein, the contact signal includes alarm and/or lock.

Example 1:

As shown in FIG. 1, a gas density relay provided by the first embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas circuit blocking pressure regulating mechanism 5, and an online verification contact signal sampling unit 6. Intelligent control unit 7, electrical equipment 8. The gas density relay body 1 , the pressure sensor 2 , the temperature sensor 3 and the intelligent control unit 7 are arranged on the gas circuit blocking pressure regulating mechanism 5 . Figure 1 is a schematic diagram of the working state of a gas density relay.

Specifically, the air circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501, a blocking member 502, a blocking sealing member 503, a connecting member 504, a driving component 505, a first interface 506, a second interface 507, a seal connecting member 508, a Four interfaces 509, contact signal interlocks 5K. The partition member 502 is disposed in the sealing cavity 501 , and the partition member 502 is connected with the driving component 505 through the connecting member 504 and the sealing member coupling member 508 . The driving component 505 may include, but is not limited to, a magnetic force, a motor, an electric push rod motor, a stepper motor, a reciprocating motion mechanism, a Carnot cycle mechanism, an air compressor, a compressor, a bleed valve, a pressure making pump, and a booster pump , booster valve, electric air pump, electromagnetic air pump, pneumatic components, magnetic coupling thrust mechanism, heating generating thrust mechanism, electric heating generating thrust mechanism, and chemical reaction generating thrust mechanism. Heating a thrust-generating mechanism, such as heating a bimetal, will generate a thrust-generating mechanism. The driving component 505 is to move the partition member 502 to cut off the gas circuit of the electrical equipment, so that the gas density relay body 1 and the gas circuit of the electrical equipment 8 are separated, and at the same time, the gas pressure of the gas density relay body 1 can be adjusted to rise and fall, so that the gas density The contacts of the relay body 1 are activated or reset. The blocking member 502 is in sealing contact with the inner wall of the sealing cavity 501; the blocking member 502 includes, but is not limited to, one of a piston and a sealing isolation member. The sealing element coupling part 508 is arranged with the sealing cavity 501 , and the connecting element 504 is connected with the driving part 505 through the sealing element coupling element 508 . Specifically, one end of the sealed cavity 501 is provided with a fifth interface, and the first interface 506 is closer to the fifth interface 530 than the second interface 507 , or the first interface 506 is further away from the fifth interface 530 than the second interface 507 , That is, the blocking member 502 cannot block the first interface 506 and the second interface 507 at the same time. The sealing coupling member 508 is disposed at the fifth interface 530 of the sealing cavity 501 , one end of which is sealedly connected to the fifth interface 530 , the other end of which is sealedly connected to the driving end of the driving part 505 , or the other end of which seals the driving part 505 Within seal coupler 508 . One end of the connecting piece 504 is connected to the blocking piece 502 , and the other end is connected to the driving part 505 through the sealing piece coupling piece 508 . The seal coupling member 508 includes, but is not limited to, one of a bellows, an airbag, and a sealing ring. The relative positions of the first interface 506 and the second interface 507 of the air circuit blocking pressure regulating mechanism 5 are staggered. The second interface 507 of the gas circuit blocking pressure regulating mechanism 5 is directly or indirectly connected to the electrical equipment 8, and the first interface 506 of the gas circuit blocking pressure regulating mechanism 5 is directly or indirectly communicated with the gas density relay body 1; The pressure sensor 2 is connected to the fourth interface 509 of the air circuit blocking pressure regulating mechanism 5 . In the working state, the sealed cavity 501 of the gas circuit blocking pressure regulating mechanism 5 is connected with the gas circuit of the gas density relay body 1 and the electrical equipment 8; the online verification contact signal sampling unit 6 is respectively connected with the gas density relay body 1 and 8. The intelligent control unit 7 is connected; the pressure sensor 2, the temperature sensor 3 and the gas circuit blocking pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7; the isolation sampling element of the online verification contact signal sampling unit 6 is interlocked with the contact signal 5K is set correspondingly. During the calibration, the contact signal interlock 5K can cut off the contact signal control circuit of the gas density relay body 1 to ensure that the contact action signal of the gas density relay body 1 will not be uploaded during the calibration, and thus will not affect the safe operation of the power grid. The isolated sampling element of the online verification contact signal sampling unit 6 includes, but is not limited to, one of a travel switch, a micro switch, a button, an electric switch, a displacement switch, an electromagnetic relay, and an optocoupler.

Among them, the gas density relay body 1 includes: a bimetallic sheet compensated gas density relay, a gas compensated gas density relay, or a bimetallic and gas compensation hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay Density relays, mechanical and digital gas density relays; density relays with indication (density relay with pointer display, or density relay with digital display, density relay with liquid crystal display), density relay without indication (ie density switch) ; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relays, etc.

As shown in FIG. 3 , the intelligent control unit 7 is mainly composed of a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) may be a general-purpose computer, an industrial computer, a CPU, a single-chip microcomputer, an ARM chip, an AI chip, an MCU, an FPGA, a PLC, etc., an industrial control board, an embedded main control board, etc., as well as other intelligent integrated circuits. The power supply 72 (U2) can be switching power supply, AC 220V, DC power supply, LDO, programmable power supply, solar energy, storage battery, rechargeable battery, battery, electric field induction power supply, magnetic field induction power supply, wireless charging power supply, capacitive power supply, etc.

The type of pressure sensor 2: absolute pressure sensor, relative pressure sensor, or absolute pressure sensor and relative pressure sensor, and the number can be several. The form of the pressure sensor 2 can be a diffusion silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil attached to a Baden tube), a resistance pressure sensor (such as a Baden tube with a sliding wire resistance) pressure measurement sensor); it can be an analog pressure sensor or a digital pressure sensor. Pressure acquisition is a variety of pressure-sensitive elements such as pressure sensors and pressure transmitters, such as diffused silicon type, sapphire type, piezoelectric type, strain gauge type (resistance strain gauge type, ceramic strain gauge type).

The temperature sensor 3 can be: thermocouple, thermistor, semiconductor type; can be contact type and non-contact type; can be thermal resistance and thermocouple. In short, temperature acquisition can use various temperature sensing elements such as temperature sensors and temperature transmitters.

The gas circuit blocking pressure regulating mechanism 5 of this embodiment mainly consists of a sealing cavity 501 , a blocking member 502 , a blocking sealing member 503 , a connecting member 504 , a driving member 505 , a first interface 506 , a second interface 507 , and a sealing member connecting member 508 , the fourth interface 509, and the contact signal interlocking piece 5K. The sealed cavity 501 includes a seal coupling 508, and the sealing coupling 508 is composed of a bellows. The partition member 502 with the partition seal member 503 disposed therein is disposed in the sealing cavity 501 , and the partition member 502 is connected with the driving component 505 through the connecting member 504 and the sealing member coupling member 508 . The driving part 505 is constituted by a motor, an electric push rod motor, a stepping motor, or a reciprocating mechanism. The blocking member 502 is in sealing contact with the inner wall of the sealing cavity 501 through the blocking sealing member 503; the blocking member 502 includes, but is not limited to, one of a piston and a sealing isolation member. Since the seal coupling part 508 is arranged with the sealing cavity 501, the connecting part 504 is connected with the driving part 505 through the sealing part coupling part 508, which ensures that the whole calibration process is sealed.

As shown in FIG. 3 , the on-line verification contact signal sampling unit 6 is controlled by the contact signal interlock 5K, and mainly completes the contact signal sampling of the gas density relay body 1 . That is, the basic requirements or functions of the on-line verification contact signal sampling unit 6 are: 1) The safe operation of the electrical equipment is not affected during verification. That is, during the verification, when the contact signal of the gas density relay body 1 acts, it will not affect the safe operation of the electrical equipment; 2) The contact signal control circuit of the gas density relay body 1 does not affect the performance of the gas density relay, especially if it does not. Affecting the performance of the intelligent control unit 7 will not damage the gas density relay or affect the test work.

The basic requirement or function of the intelligent control unit 7 is to complete the control and signal acquisition of the air circuit blocking pressure regulating mechanism 5 through the intelligent control unit 7 . Realization: It can cut off the gas circuit of the first interface and the second interface, and then cut off the gas circuit of the density relay body and the electrical equipment during verification, and can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts. , converted into the corresponding pressure value P ₂₀ (density value) at 20°C, that is, the contact action value P _D20 of the gas density relay body 1 can be detected, and the verification work of the gas density relay body 1 is completed. Alternatively, the density value P _D20 when the contact signal of the gas density relay body 1 is actuated can be directly detected to complete the verification work of the gas density relay body 1 .

Of course, the intelligent control unit 7 can also realize: complete test data storage; and/or test data export; and/or test data can be printed; and/or data communication with the host computer; and/or can input analog, digital quantity information. The intelligent control unit 7 also includes a communication module, through which information such as test data and/or verification results can be transmitted over a long distance; when the rated pressure value of the gas density relay body 1 outputs a signal, the intelligent control unit 7 At the same time, the density value at that time is collected to complete the calibration of the rated pressure value of the gas density relay body 1. At the same time, through the test of the rated pressure value of the gas density relay body 1, the self-calibration work among the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 can be completed to realize maintenance-free.

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

The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the gas circuit blocking pressure regulating mechanism 5, the online verification contact signal sampling unit 6, the intelligent control unit 7 or/and the multi-way joints can be flexibly set as required. For example, the gas density relay body 1 , the pressure sensor 2 and the temperature sensor 3 can be arranged together; or the pressure sensor 2 and the gas circuit blocking pressure regulating mechanism 5 can be arranged together. In short, the settings between them can be flexibly arranged and combined. The sealing cavity 501 may be hollow or partially hollow, and its shape cooperates with the partition member 502 and is used in conjunction with the partition member 502 to adjust gas pressure changes.

The working principle of the gas density relay: the intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3, and obtains the corresponding 20°C pressure value P ₂₀ (that is, the gas density value, that is, the online monitoring gas density value. ). When the gas density relay body 1 needs to be verified, if the gas density value P ₂₀ ≥ the set safety verification density value P _S , the gas density relay will issue an instruction, that is, the intelligent control unit 7 drives the gas circuit to cut off the pressure to adjust The driving part 505 of the mechanism 5, the driving part 505 pushes the connecting piece 504 to move, thereby making the partition 502 and the partition seal 503 move in the direction of the first interface 506 and the second interface 507, as shown in FIG. 2 and FIG. During the movement, through the contact signal interlock 5K to complete the online verification of the contact signal sampling unit 6 to cut off the contact signal of the gas density relay, and connect the contact of the gas density relay body 1 to the intelligent control unit 7 . Because the gas density relay has already monitored and judged that the gas density value P ₂₀ ≥ the set safety verification density value P _S before the calibration is started, the gas of the electrical equipment is within the safe operating range, and the gas leakage is a slow The process is safe during verification. With the movement of the partition member 502 and the partition seal member 503 , the first interface 506 and the second interface 507 are partitioned from each other under the blocking action of the partition member 502 and the partition seal member 503 . That is, the partition member 502 and the partition seal member 503 of the air circuit blocking pressure regulating mechanism 5 move toward the first interface 506 and the second interface 507 under the action of the driving member 505 . When the partition member 502 crosses the first interface 506 After the interface 506 is connected, the blocking member 502 blocks the air connection between the first interface 506 and the second interface 507, and as the blocking member 502 continues to move in the direction of the second interface 507, the volume of the sealing cavity 501 changes, and the volume of the sealing cavity 501 changes. Adjust the pressure of the gas density relay body 1 to make the gas pressure drop slowly, so that the contact action of the gas density relay body 1 occurs, and the contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 According to the pressure value P and temperature value T of the pressure sensor 2 and the temperature sensor 3 collected during the contact action, and then the gas density value P ₂₀ is obtained through calculation, or the gas density value P ₂₀ is directly obtained, and the gas density relay body 1 is detected. The contact signal action value P _D20 completes the verification of the contact signal action value of the gas density relay. That is, the intelligent control unit 7 converts it into the pressure value P ₂₀ (density value) corresponding to 20°C according to the gas pressure-temperature relationship, and can detect the contact action value P _D20 of the gas density relay body 1. Wait until the gas density relay body 1 After all the contact action values of the alarm and/or blocking signal are detected, the air circuit blocking pressure regulating mechanism 5 is driven by the intelligent control unit 7, the blocking member 502 moves in the direction of the first interface 506, and the volume of the sealing cavity 501 changes. , the pressure of the gas density relay body 1 can be adjusted, so that the gas pressure rises slowly, so that the contact reset of the gas density relay body 1 occurs, and the contact reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6, and the intelligent control The unit 7 obtains the gas density value P _{20 according to the pressure value P and the temperature value T when the contact is reset, or directly obtains the gas density value P 20 ,} detects the contact signal return value P _F20 of the gas density relay, and completes the contact signal of the gas density relay The verification work of the return value P _F20 . The calibration can be repeated for many times (for example, 2-3 times), and then the average value is calculated, thus completing the calibration work of the gas density relay body 1 .

When all the contact signal verification work is completed, the intelligent control unit 7 controls the air circuit blocking pressure regulating mechanism 5, and the blocking member 502 of the gas circuit blocking pressure regulating mechanism 5 moves under the action of the driving member 505 to block the gas circuit. The air paths of the first interface 506 and the second interface 507 of the pressure regulating mechanism 5 are connected to each other (as shown in FIG. 1 ), and along with the movement of the contact signal interlock 5K, the online verification contact signal sampling unit 6 is adjusted to work. state, the control loop of the contact signal of the gas density relay body 1 resumes the normal working state. As shown in Figure 1: At this time, the gas paths of the first interface 506 and the second interface 507 of the gas circuit blocking pressure regulating mechanism 5 are connected to each other, that is, the gas density relay body 1 is connected to the electrical equipment 8 on the gas circuit, and the gas density The relay body 1 normally monitors the gas density of the gas chamber of the electrical equipment, and can monitor the gas density of the electrical equipment online. That is, the density monitoring circuit of the gas density relay body 1 works normally, and the gas density relay body 1 safely monitors the gas density of the electrical equipment 8, so that the electrical equipment 8 can work safely and reliably. In this way, it is convenient to complete the online verification of the gas density relay body 1 , and at the same time, the online verification of the gas density relay body 1 will not affect the safe operation of the electrical equipment 8 .

When the gas density relay body 1 completes the calibration work, the gas density relay will make a judgment, and the detection result can be notified in a flexible manner. Specifically: 1) The gas density relay can be notified on the spot, such as through indicator lights, digital or liquid crystal displays; 2) Or the gas density relay can be uploaded through online remote communication, for example, it can be uploaded to the online monitoring system. 3) or through wireless upload, upload to a specific terminal, for example, you can upload the mobile phone wirelessly; 4) or upload through other channels; 5) or upload abnormal results through the alarm signal line or special signal line; 6) upload separately , or bundled with other signals to upload. In short, after the gas density relay completes the online verification of the gas density relay body 1, if there is an abnormality, it can automatically send an alarm, which can be uploaded to the remote end, or can be sent to a designated receiver, such as a mobile phone. Or, after the gas density relay completes the verification of the gas density relay body 1, if there is any abnormality, the intelligent control unit 7 can upload the remote (monitoring room, background monitoring platform, etc.) through the alarm contact signal of the gas density relay body 1, and Notices can also be displayed in situ. The simple version of the gas density relay online verification can upload the abnormal results through the alarm signal line. It can be uploaded according to a certain rule. For example, when there is an abnormality, a contact is connected in parallel with the alarm signal contact, which is regularly closed and opened, and the status can be obtained through analysis; or uploaded through an independent verification signal line. Specifically, it can be uploaded in a good state, or there are problems, or it can be uploaded through online monitoring of remote transmission density, or the verification results can be uploaded through a separate verification signal line, or through local display, local alarm, or through wireless upload. Upload online with a smartphone. The communication mode is wired or wireless, and the wired communication mode can be industrial bus such as RS232, RS485, CAN-BUS, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; The wireless communication method can be 2G/3G/4G/5G, etc., WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, sensor built-in 5G/NB-IOT communication module (such as NB-IOT) and so on. In short, there are multiple ways and multiple combinations to fully ensure the reliable performance of the gas density relay.

The gas density relay has a safety protection function. Specifically, when the gas density relay is lower than the set value, the gas density relay will automatically no longer perform on-line verification on the density relay body 1, and will issue a notification signal. For example, when the gas density value of the equipment is less than the set value _PS , the verification is not performed. For example: Only when the gas density value of the equipment is greater than or equal to (alarm pressure value + 0.02MPa), online verification can be performed.

The gas density relay can perform online verification according to the set time, and can also perform online verification according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). For high temperature, low temperature, normal temperature, and 20°C ambient temperature online calibration, the error determination requirements are different. For example, when 20°C ambient temperature is calibrated, the accuracy requirements of the gas density relay can be 1.0 or 1.6. High temperature can be level 2.5. Specifically, it can be implemented in accordance with relevant standards according to the requirements of temperature. For example, according to 4.8 temperature compensation performance regulations in DL/T 259 "Sulfur Hexafluoride Gas Density Relay Calibration Regulations", the accuracy requirements corresponding to each temperature value.

The gas density relay can compare its error performance at different temperatures and different time periods according to the density relay. That is, in different periods and within the same temperature range, the performance of gas density relays and electrical equipment is determined. It has the comparison of various periods of history, the comparison between history and the present.

The gas density relay can be repeatedly calibrated for many times (for example, 2 to 3 times), and the average value is calculated according to each calibration result. When necessary, the gas density relay can be checked online at any time.

The gas density relay has the functions of pressure, temperature measurement and software conversion. On the premise of not affecting the safe operation of the electrical equipment, the alarm and/or blocking contact action value and/or return value of the gas density relay body 1 can be detected online. Of course, the return value of the alarm and/or blocking contact signal can also be untested according to requirements. At the same time, the gas density relay can also monitor the gas density value, and/or pressure value, and/or temperature value of the electrical equipment online, and upload it to the target device for online monitoring.

Embodiment 2:

As shown in FIG. 4 , a gas density relay provided in the second embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a gas circuit blocking pressure regulating mechanism 5, and an online verification contact Signal sampling unit 6 , intelligent control unit 7 , electrical equipment 8 , multi-way connector 9 . The pressure sensor 2 , the temperature sensor 3 , the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1 .

Figure 4 is a schematic diagram of the working state of a gas density relay. Specifically, the air circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501, a blocking member 502, a blocking sealing member 503, a connecting member 504, a driving component 505, a first interface 506, a second interface 507, a third interface 511, a connecting member Seal 510 , cavity (or housing) 512 . One end of the valve 4 is connected with the third port 511 , and the other end of the valve 4 is connected with the multi-way joint 9 . The first interface 506 is provided at a position between the second interface 507 and the third interface 511 . The connecting piece 504 is sealed with the sealing cavity 501 through the connecting piece sealing piece 510; wherein the blocking piece 502 is arranged in the sealing cavity 501, and the blocking piece 502 is connected with the driving part 505 through the connecting piece 504; the connecting piece 504, the driving part 505, Connector seal 510 is sealed within cavity (or housing) 512 . The cavity (or housing) 512 is well sealed with the sealing cavity 501 , that is, the cavity (or housing) 512 ensures that the air circuit blocking pressure regulating mechanism 5 has good sealing performance. The gas density relay body 1 is installed on the gas circuit blocking pressure regulating mechanism 5; the gas circuit blocking pressure regulating mechanism 5 is mounted on the multi-way joint 9; the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1, and the pressure The sensor 2 communicates with the gas density relay body 1 on the gas path. In the working state, the gas circuit blocking pressure regulating mechanism 5 is communicated with the gas density relay body 1; the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 , the temperature sensor 3 , the valve 4 and the gas circuit blocking pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7 . The multi-way joint 9 is also connected with an air supply port.

The control of valve 4 can adopt various transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; Under the action of temperature or other forms of sensing signals, it acts according to predetermined requirements, or simply opens or closes without relying on sensing signals. The valve relies on driving or automatic mechanisms to make the opening and closing parts lift, slide, swing or swing. Rotary movement, thereby changing the size of its flow channel area to achieve its control function. The valve 4 can be an automatic valve, a power-driven valve and a manual valve according to the driving mode. The automatic valve can 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 drive, motor (motor) drive. The valve can be automatic or manual, semi-automatic. The verification process can be completed automatically or semi-automatically through manual cooperation. The valve 4 is directly or indirectly connected to the electrical equipment through a self-sealing valve, a manual valve, or a non-removable valve, integrated or separate. The valve 4 may be of a normally open type or a normally closed type, and may be of a one-way type or a two-way type as required. In short, opening or closing the gas circuit is realized through the electronically controlled valve 4 . The electric control valve 4 may be in the following manner: a solenoid valve, an electric control ball valve, an electric valve, an electric control proportional valve, and the like.

The difference from the first embodiment is that the air circuit blocking pressure regulating mechanism 5 in this embodiment mainly includes the connecting piece 504 being sealed with the sealing cavity 501 through the connecting piece sealing piece 510 ; Sealed within cavity (or housing) 512 . The cavity (or housing) 512 is well sealed with the sealing cavity 501 , that is, the cavity (or housing) 512 ensures that the air circuit blocking pressure regulating mechanism 5 has good sealing performance. The biggest difference is that this embodiment also includes a valve 4, through which the verification of the density relay body with the function of overpressure alarm contact is completed. As in the first embodiment, after completing the online detection of the alarm and/or blocking contact action value and/or return value of the gas density relay body 1, adjust (or automatically set) the partition member 502 to a suitable position, such as close to The second interface 507 does not cross the first interface 506, and then the valve 4 is controlled by the intelligent control unit 7, that is, the valve 4 is opened by the intelligent control unit 7, and the gas of the electrical equipment 8 enters the gas density relay body 1 at this time, Raise the pressure of the gas density relay body 1 to the set pressure value or directly to the gas pressure value of the electrical equipment 8 , and then close the valve 4 through the intelligent control unit 7 . Next, the air circuit blocking pressure regulating mechanism 5 is driven by the intelligent control unit 7, the blocking member 502 moves in the direction of the third interface 511, and the volume of the sealing cavity 501 (the right part of the blocking member 502 in FIG. 4) changes, which can be adjusted The pressure of the gas density relay body 1 causes the gas pressure to rise slowly, so that the overpressure alarm contact of the gas density relay body 1 acts, and the signal of the overpressure alarm contact action is transmitted to the online verification contact signal sampling unit 6. The intelligent control unit 7, the intelligent control unit 7 obtains the gas density value P _{20 according to the pressure value P and the temperature value T when the overpressure alarm contact occurs, or directly obtains the gas density value P 20 ,} and detects the overpressure alarm of the gas density relay The contact signal value P _C20 of the contact action, completes the verification of the overpressure alarm contact signal value P _C20 of the gas density relay body 1 . According to the control of the intelligent control unit 7, the gas circuit blocking pressure regulating mechanism 5 makes the driving component 505 push the blocking member 502 to move, so that the volume of the sealed cavity 501 changes, thereby completing the pressure drop, and detecting the overpressure alarm contact of the gas density relay The reset contact signal value P _CF20 completes the verification of the overpressure alarm contact signal return value P _CF20 of the gas density relay body 1 .

Embodiment three:

As shown in FIG. 5 , a gas density relay provided by the third embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas circuit blocking pressure regulating mechanism 5, and an online verification contact signal sampling unit 6. Intelligent control unit 7, electrical equipment 8, multi-way connector 9 and air supply connector 10. The air circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501 , a blocking member 502 , a blocking sealing member 503 , a connecting member 504 , driving components 513 , 514 , a first interface 506 , and a second interface 507 . The gas density relay body 1 is installed on the gas circuit blocking pressure regulating mechanism 5; the pressure sensor 2, the temperature sensor 3, the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The gas path blocking pressure regulating mechanism 5 is installed on the multi-port joint 9 , the pressure sensor 2 communicates with the gas density relay body 1 on the gas path; The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7 ; the air circuit blocking pressure regulating mechanism 5 is connected with the intelligent control unit 7 .

The biggest difference from the first embodiment is that the driving part of the air circuit blocking pressure regulating mechanism 5 in this embodiment is composed of a power driving part 513 and a driven part 514. Inside the cavity 501 . The blocking member 502 is connected with the driven member 514 through the connecting member 504 . According to the control of the intelligent control unit 7, the power driving member 513 pushes the driven member 514 to move, thereby causing the partition member 502 to move, thereby causing the volume of the sealed cavity 501 to change, thereby completing the pressure rise and fall. The power driving member 513 is disposed outside the sealed cavity 501, while the driven member 514 is disposed inside the sealed cavity 501. The power driving member 513 applies electromagnetic force to push the driven member 514 to move, that is, the driven member 514 and the power driving member The driven member 514 and the partition member 502 are moved by magnetic force between 513 . This embodiment can be implemented in combination with a magnetically coupled rodless cylinder.

Embodiment 4:

As shown in FIG. 6 , a gas density relay provided by the fourth embodiment of the present invention includes: a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a gas circuit blocking pressure regulating mechanism 5, and an online verification contact signal sampling unit 6. Intelligent control unit 7, electrical equipment 8. The pressure sensor 2 , the temperature sensor 3 , the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1 ; the gas density relay body 1 is arranged on the gas circuit blocking pressure regulating mechanism 5 superior. Further, the air circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501, a blocking member 502, a blocking sealing member 503, a connecting member 504, a driving component 505, a first interface 506, a second interface 507, a sealing member connecting member 508, a cavity Body (or housing) 512; seal coupling 508 may be constructed of bellows. The connecting member 504 , the driving member 505 , and the sealing member coupling member 508 are sealedly arranged inside the cavity (or housing) 512 . The second interface 507 of the gas circuit blocking pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a connector.

The difference from the first embodiment is that the connecting member 504 , the driving member 505 , and the sealing member connecting member 508 of this embodiment are sealed inside the cavity (or housing) 512 to further improve the sealing performance and ensure the safe operation of the power grid. In addition, the partition member can be directly connected with the driving member through the sealing member coupling member; or, the partition member and the connecting member can be designed in an integrated manner and directly connected with the driving member.

FIG. 7 is a schematic structural diagram of a gas density relay body 1 according to a preferred embodiment of the present application. As shown in FIG. 7 , a gas density relay body 1 includes: a casing 101 , a base 102 , an end seat 108 , a pressure detector 103 , a temperature compensation element 104 , and a plurality of signal generators arranged in the casing 101 109, movement 105, pointer 106, dial 107. One end of the pressure detector 103 is fixed on the base 102 and communicated with it, the other end of the pressure detector 103 is connected to one end of the temperature compensation element 104 through the end seat 108 , and the The other end of the temperature compensating element 104 is provided with a beam, and the beam is provided with an adjustment member that pushes the signal generator 109 and makes the contact of the signal generator 109 connect or disconnect. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected to the movement 105 through a connecting rod or directly connected to the movement 105; the pointer 106 is installed on the On the core of the machine 105 and before the dial 107 , the pointer 106 displays the gas density value in conjunction with the dial 107 . The gas density relay body 1 may also include a digital device or a liquid crystal device with an indication value display. Wherein, the signal generator 109 includes a micro switch or a magnetically assisted electrical contact, the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 includes a Baden tube or a bellows ; The temperature compensation element 104 adopts a temperature compensation sheet or a closed gas in the casing. The gas density relay body 1 of this embodiment may further include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge.

In the gas density relay body 1 of the present embodiment, the pressure detector 103 and the temperature compensation element 104 are used to correct the changed pressure and temperature to reflect the change of the density of sulfur hexafluoride gas. That is, under the action of the pressure of the measured medium sulfur hexafluoride (SF6) gas, due to the function 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 accordingly. , forcing the end of the pressure detector 103 to produce a corresponding elastic deformation displacement, which is transmitted to the movement 105 by means of the temperature compensation element 104, and the movement 105 is transmitted to the pointer 106, so that the measured density of sulfur hexafluoride gas is indicated on the dial 107 . The signal generator 109 serves as an output alarm latching contact. In this way, the gas density relay body 1 can display the gas density value of sulfur hexafluoride. If there is air leakage, the density of sulfur hexafluoride gas decreases, and the pressure detector 103 generates a corresponding downward displacement, which is transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 transmits it to the pointer 106, and the pointer 106 will Go in the direction of the small indicated value, and the degree of air leakage will be displayed on the dial 107; at the same time, the pressure detector 103 drives the beam to move downward through the temperature compensation element 104, and the adjustment member on the beam gradually moves away from the signal generator 109 until it reaches a certain value. When it reaches the level, the contact of the signal generator 109 is connected, and the corresponding contact signal (alarm or lock) is sent to monitor and control the density of sulfur hexafluoride gas in the electrical switch and other equipment, so that the electrical equipment can work safely.

If the gas density value increases, that is, when the pressure value of the sulfur hexafluoride gas in the sealed gas chamber is greater than the set pressure value of the sulfur hexafluoride gas, the pressure value also increases accordingly, and the end of the pressure detector 103 and the temperature compensate The element 104 produces a corresponding upward displacement, and the temperature compensation element 104 also displaces the beam upward, and the adjustment member on the beam moves upward and pushes the contact of the signal generator 109 to disconnect, and the contact signal (alarm or lock) is released.

Embodiment 5:

As shown in FIG. 8 , a gas density relay or gas density monitoring device with an online self-calibration function provided by the fifth embodiment of the present invention includes: a gas density relay body 1 , a pressure sensor 2 , a temperature sensor 3 , and a gas circuit breaker Pressure regulating mechanism 5 , online verification contact signal sampling unit 6 , intelligent control unit 7 , electrical equipment 8 . The pressure sensor 2 , the temperature sensor 3 , the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1 ; the gas density relay body 1 is arranged on the gas circuit blocking pressure regulating mechanism 5 superior. Further, the gas circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501, a blocking member 502, a blocking sealing member 503, a connecting member 504, and a driving component composed of a heating device 516 and a bimetallic sheet 515 (ie, electric heating generates a thrust mechanism), The first interface 506, the second interface 507, the connecting piece 517, the sliding piece 518, the heat insulating piece 519, the cavity (or housing); 517 and the sliding member 518 are sealed inside the cavity (or housing). The second interface 507 of the gas circuit blocking pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a connector.

The difference from the first embodiment is that the connecting member 504 , the heating device 516 and the bimetal 515 in this embodiment are composed of the driving member, the connecting member 517 and the sliding member 518 and are sealed and arranged inside the cavity (or housing), and further Improve the sealing performance to ensure the safe operation of the power grid. The driving component in this case is composed of a heating device 516 and a bimetallic sheet 515. When the heating device 516 is energized and heated, the bimetallic sheet 515 expands, pushing the connecting piece 517 and the sliding piece 518 to move, and then pushes the connecting piece 504 to move. , and then push the partition member 502 to move to complete the partition of the gas path and the adjustment of the pressure.

Embodiment 6:

As shown in FIG. 9 , a gas density relay or gas density monitoring device with an online self-calibration function provided by Embodiment 6 of the present invention includes: a gas density relay body 1 , a pressure sensor 2 , a temperature sensor 3 , and a gas circuit breaker Pressure regulating mechanism 5 , online verification contact signal sampling unit 6 , intelligent control unit 7 , electrical equipment 8 . The pressure sensor 2 , the temperature sensor 3 , the online verification contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1 ; the gas density relay body 1 is arranged on the gas circuit blocking pressure regulating mechanism 5 superior. Further, the air circuit blocking pressure regulating mechanism 5 includes a sealing cavity 501, a blocking member 502, a blocking sealing member 503A, a blocking sealing member 503B, a connecting member 504A, a connecting member 504B, a driving component 505, a first interface 506, and a second interface. 507 , capillary 520 , cavity (or housing) 512 . The second interface 507 of the gas circuit blocking pressure regulating mechanism 5 can be directly or indirectly connected to the electrical device 8 through a connector. The sealed cavity 501 is composed of a bellows 508, a partition member 502, and a blocking member 521; on the gas path, the gas density relay body 1 cuts off the first interface of the pressure regulating mechanism 5 from the gas path through a helical capillary 520 506 is connected. The sealed cavity 501 is also provided with a fixed point (not shown in the figure) whose position cannot be changed, such as the point where the wall of the sealed cavity 501 is fixedly connected to the outer casing 512, and the driving part 505 can be installed or connected on the fixed point , to prevent the position of the driving member 505 from changing. The driving part 505 can be arranged inside or outside the sealed cavity 501 .

The difference from the first embodiment is that: when this case is working, the intelligent control unit 7 controls the driving component 505 to move the connecting piece 504B downward, thereby pushing the partition piece 502 to move downward, closing the air path of the second interface 507. , so that the gas density relay body 1 and the electrical equipment 8 are separated on the gas path; and at the same time or subsequently, the connecting piece 504A is moved upward, and then the blocking piece 521 is pushed upward, so that the bellows 508 is expanded, so that the sealing cavity 501 is formed. The volume changes, and then the pressure is adjusted to decrease or increase, and the verification of the density relay body 1 is completed. In this case, the partition member 502 can be moved downward first to close the air path of the second interface 507, and then the connecting member 504A can be moved upward, and then the blocking member 521 can be pushed upward to expand the bellows 508 to seal the cavity. The volume of the body 501 changes, thereby adjusting the pressure drop or increase; alternatively, the partition member 502 can also be moved downward to close the air path of the second interface 507, and the connecting member 504A can be moved upward at the same time, thereby pushing the blocking member 521 The upward movement causes the bellows 508 to expand, so that the volume of the sealing cavity 501 changes, and then the pressure is adjusted to decrease or increase. At the same time, the partition member 502 can be moved downward, the blocking member 521 can be moved upward, and the partition member 502 can be moved downward, and the gas path of the second interface 507 is closed, and the gas path of the second interface 507 is kept closed; The blocking member 521 can continue to move upward to expand the bellows 508, so that the volume of the sealing cavity 501 changes, thereby adjusting the pressure to decrease or increase.

Embodiment 7:

As shown in FIG. 10 , a gas density relay or a gas density monitoring device with an online self-calibration function provided by Embodiment 7 of the present invention includes: a gas density relay body 1 , a first pressure sensor 21 , and a second pressure sensor 22 , a first temperature sensor 31 , a second temperature sensor 32 , a gas circuit blocking pressure regulating mechanism 5 , an online calibration contact signal sampling unit 6 , an intelligent control unit 7 , a multi-way connector 9 , an air supply interface 10 , and a self-sealing valve 11 . One end of the self-sealing valve 11 is sealingly connected to the electrical equipment 8 , and the other end of the self-sealing valve 11 is connected to the multi-way joint 9 . The second pressure sensor 21, the second temperature sensor 22, the air circuit blocking pressure regulating mechanism 5, and the air supply port 10 are arranged on the multi-way joint 9; the first pressure sensor 21 and the first temperature sensor 31 are arranged on the gas circuit blocking pressure adjustment mechanism Institution 5. The first pressure sensor 21 , the second pressure sensor 22 , the first temperature sensor 31 , and the second temperature sensor 32 are respectively connected to the intelligent control unit 7 . The first pressure sensor 21 , the second pressure sensor 22 , and the gas density relay body 1 are communicated with the gas circuit blocking pressure regulating mechanism 5 on the gas circuit; the gas circuit blocking pressure regulating mechanism 5 is connected with the intelligent control unit 7 .

The difference from the first embodiment is that there are two pressure sensors, namely a first pressure sensor and a second pressure sensor; and there are two temperature sensors, respectively a first temperature sensor and a second temperature sensor. This embodiment provides a plurality of pressure sensors and temperature sensors, the purpose is: the pressure values monitored by the first pressure sensor and the second pressure sensor can be compared and verified with each other; The temperature values can be compared and verified with each other; the density value P1 ₂₀ monitored by the first pressure sensor and the first temperature sensor is compared with the density value P2 ₂₀ monitored by the second pressure sensor and the second temperature sensor. , and verify each other; even the density value Pe ₂₀ of the rated value of the gas density relay body 1 can be obtained by online verification, and compared with each other to verify each other. To further ensure the reliable performance of the density relay, automatic monitoring and comparison, to achieve maintenance-free.

At the same time, it may also contain a micro-water sensor for monitoring the micro-water content of electrical equipment, and a decomposition product sensor for monitoring the content of decomposition products.

In addition, the technical product of the present invention may also have a safety protection function, specifically: 1) when the density value monitored by the first pressure sensor and the first temperature sensor or the second pressure sensor and the second temperature sensor is lower than the set value, The gas density relay will automatically no longer verify the gas density relay body, and issue a notification signal. For example, when the gas density value of the device is less than the set value, the calibration is not performed. Only when the gas density value of the equipment is greater than or equal to (locking pressure + 0.02MPa), the calibration can be carried out. Docking point alarms have status indication. 2) Or during verification, the valve is closed at this time, and when the density value monitored by the second pressure sensor and the second temperature sensor is lower than the set value, the gas density relay will automatically no longer verify the gas density relay body. , and at the same time issue a notification signal (air leakage). For example, when the gas density value of the equipment is less than the set value (locking pressure + 0.02MPa), the calibration is not performed. The set value can be arbitrarily set as required. At the same time, the gas density relay also has multiple pressure sensors and temperature sensors for mutual verification, as well as mutual verification between the sensor and the gas density relay, to ensure that the gas density relay works normally. That is, the pressure values monitored by the first pressure sensor and the second pressure sensor are compared and verified with each other; the temperature values monitored by the first temperature sensor and the second temperature sensor are compared and verified with each other; The density value P1 ₂₀ monitored by a pressure sensor and the first temperature sensor is compared with the density value P2 ₂₀ monitored by the second pressure sensor and the second temperature sensor to verify each other; The density value Pe ₂₀ of the rated value of the density relay body is compared with each other and verified with each other.

In summary, the present invention modifies the traditional gas density relay body, and adds a gas circuit (which can pass through a pipeline) connecting part, a pressure regulating part, a signal measurement control part, etc. The main function is to adjust the gas density relay body. The contact value of the gas density relay (the pressure value during the alarm/blocking action) is checked and measured online, and it is automatically converted into the corresponding pressure value at 20 °C, and the performance detection of the contact (alarm and blocking) value of the gas density relay body is realized online. The installation positions of its gas density relay body, pressure sensor, temperature sensor, gas circuit blocking pressure regulating mechanism, on-line calibration contact signal sampling unit, and intelligent control unit can be combined flexibly. For example: gas density relay body, pressure sensor, temperature sensor, online calibration contact signal sampling unit, intelligent control unit can be combined together, integrated design, or separate design; can be installed on the shell, or multi-way connector can also be connected together by connecting pipes. The valve can be directly connected to the electrical equipment, or it can be connected through a self-sealing valve or a gas pipe. Pressure sensor, temperature sensor, online calibration contact signal sampling unit, intelligent control unit can be combined together, integrated design; pressure sensor, temperature sensor can be combined together, integrated design; online calibration contact signal sampling unit, intelligent control Units can be grouped together for an all-in-one design. In short, the structure is eclectic.

The gas density relay involved in the method for reforming a gas density relay according to the present invention may refer to a gas density relay whose constituent elements are designed as an integral structure, or may refer to a gas whose constituent elements are designed as a separate structure Density relays, generally also known as gas density monitoring devices.

For gas density relays with on-line self-calibration function, when calibrating the contacts of density relays at high temperature, low temperature, normal temperature and 20°C ambient temperature, the error judgment requirements can be different, and the specific requirements can be based on temperature requirements and relevant standards Implementation; can compare the error performance of the density relay at different temperatures and different time periods. That is, in different periods and within the same temperature range, to determine the performance of the density relay. It has the comparison of various periods of history, the comparison between history and the present. The body of the density relay can also be checked. When necessary, the contact signal of the density relay can be checked at any time; it is judged whether the density value of the gas density relay body and the monitored electrical equipment is normal. That is, the density value of the electrical equipment itself, the gas density relay body, the pressure sensor, and the temperature sensor can be judged, analyzed, and compared to normal and abnormal, and then the gas density monitoring of the electrical equipment, the gas density relay body and other states can be judged, Compare and analyze; also monitor the contact signal state of the gas density relay, and implement remote transmission of its state. You can know the contact signal status of the gas density relay in the background: open or closed, so as to add a layer of monitoring and improve reliability; it can also detect, or detect and determine the temperature compensation performance of the gas density relay body; The contact resistance of the gas density relay body can be detected, or detected and judged; the insulation performance of the gas density relay body can also be detected, or detected and judged.

The structure of the application is compact and reasonable, and each component has good anti-rust and anti-vibration capabilities, is firm in installation, and is reliable in use. The connection, disassembly and assembly of each pipeline of the gas density relay are easy to operate, and the equipment and components are easy to maintain. The present application can complete the calibration of the gas density relay without the need for maintenance personnel to go to the site, thereby greatly improving the reliability of the power grid, improving the efficiency and reducing the cost.

The specific embodiments of the present invention have been described above in detail, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included within the scope of the present invention.

Claims (49)

1. A method for modifying a gas density relay, comprising:

communicating a gas density detection sensor with the gas density relay body;

connecting the gas path of the gas density relay body with a first interface of a gas path partition pressure adjusting mechanism; the gas path partition pressure adjusting mechanism is also provided with a second interface communicated with the electrical equipment; the gas path partition pressure adjusting mechanism comprises a sealed cavity and a partition piece positioned in the sealed cavity, and a first interface and a second interface are both arranged on the wall of the sealed cavity and are communicated with the inner space of the sealed cavity; the partition piece is used for partitioning an air passage between the first interface and the second interface and regulating the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;

directly or indirectly connecting an online check contact signal sampling unit with the gas density relay body, wherein the online check contact signal sampling unit samples a contact signal of the gas density relay body;

the intelligent control unit is respectively connected with the gas density detection sensor, the gas circuit partition pressure adjusting mechanism and the online check contact signal sampling unit to complete the control of the gas circuit partition pressure adjusting mechanism, the pressure value acquisition, the temperature value acquisition and/or the gas density value acquisition, and the detection of a contact signal action value and/or a contact signal return value of the gas density relay body;

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

2. A method of retrofitting a gas density relay according to claim 1, wherein: the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas path partition pressure adjusting mechanism; the gas circuit partition pressure adjusting mechanism is arranged on the gas density relay body; or,

the gas density detection sensor, the gas circuit partition pressure adjusting mechanism, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,

the gas density detection sensor is arranged on the gas density relay body; or,

the gas density detection sensor is arranged on the gas path partition pressure adjusting mechanism; or,

the gas density relay body is arranged on the gas path partition pressure adjusting mechanism; or,

the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas circuit partition pressure adjusting mechanism.

3. A method of retrofitting a gas density relay according to claim 1, wherein: the gas density relay body and the gas density detection sensor are of an integrated structure.

4. A method of retrofitting a gas density relay according to claim 3, wherein: the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.

5. A method of retrofitting a gas density relay according to claim 1, wherein: the gas density detection sensor is of an integrated structure.

6. A method of retrofitting a gas density relay according to claim 5, wherein: the gas density detection sensor is a gas density transmitter with an integrated structure.

7. A method of retrofitting a gas density relay according to claim 6, wherein: the online checking contact signal sampling unit is arranged on the gas density transmitter.

8. A method of retrofitting a gas density relay according to claim 1, wherein: the online check joint signal sampling unit and the intelligent control unit are arranged together.

9. A method of retrofitting a gas density relay according to claim 8, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

10. A method of retrofitting a gas density relay according to claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or,

a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; or,

a density detection sensor adopting quartz tuning fork technology.

11. A method of retrofitting a gas density relay according to claim 10, wherein: the pressure sensor is arranged on the gas path of the gas density relay body or the gas path isolation pressure adjusting mechanism;

the temperature sensor is arranged on or outside the gas path of the gas density relay body, or in the gas density relay body, or outside the gas density relay body.

12. A method of retrofitting a gas density relay according to claim 1, wherein: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish gas density relay or gas density monitoring devices are to the on-line monitoring of the gas density of the electrical equipment who monitors.

13. A method of retrofitting a gas density relay according to claim 1, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay or the gas density monitoring device; or,

the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay or gas density monitoring devices's online check-up.

14. A method of retrofitting a gas density relay according to claim 1, wherein: the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or,

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

15. A method of retrofitting a gas density relay according to claim 1, wherein: the gas circuit partition pressure adjusting mechanism also comprises a connecting piece and a driving part, and the partition piece is connected with the driving part through the connecting piece; or,

the separating piece and the connecting piece are integrally designed and are directly connected with the driving part; or,

the spacer is associated with the drive member by a magnetic coupling.

16. A method of retrofitting a gas density relay according to claim 15, wherein: the driving part comprises one of a magnetic driving mechanism, a motor, a Carnot circulation mechanism, a compressor, a vent valve, a pressure-generating pump, a booster valve, a pneumatic element, a heating thrust-generating mechanism and a chemical reaction thrust-generating mechanism.

17. A method of retrofitting a gas density relay according to claim 15, wherein: one end of the sealed cavity is provided with a fifth interface, one end of the connecting piece is connected with the partition piece, and the other end of the connecting piece penetrates out of the fifth interface and is connected to the driving part.

18. A method of retrofitting a gas density relay according to claim 17, wherein: the first interface is closer to the fifth interface than the second interface, or the first interface is farther from the fifth interface than the second interface.

19. A method of retrofitting a gas density relay according to claim 17, wherein: the air path blocking pressure adjusting mechanism further comprises a sealing element connecting piece, the sealing element connecting piece is arranged at a fifth interface of the sealing cavity, and the other end of the connecting piece penetrates through the sealing element connecting piece to be connected with the driving part.

20. A method of retrofitting a gas density relay according to claim 19, wherein: the seal coupler includes one of a bellows, a bladder, and a seal ring.

21. A method of retrofitting a gas density relay according to claim 15, wherein: the sealing cavity is a telescopic cavity, the driving part is positioned in the sealing cavity, and driving ends are arranged in two directions; the connecting piece comprises a first connecting piece and a second connecting piece, and one ends of the first connecting piece and the second connecting piece are respectively connected to the driving ends in two directions; the other end of the first connecting piece is connected with the inner wall of the sealed cavity; the other end of the second connecting piece is connected with the partition piece, the partition piece is provided with a through hole for communicating the inside of the sealing cavity with the second interface, a sealing piece is arranged on one side, facing the second interface, of the partition piece, and the sealing piece surrounds the through hole.

22. A method of retrofitting a gas density relay according to claim 21, wherein: the two driving ends face to opposite directions.

23. A method of retrofitting a gas density relay according to claim 15, wherein: during checking, the air path cuts off the movement of the cutting part of the pressure regulating mechanism under the drive of the driving part, the cutting part cuts off the air path connection of the first interface and the second interface, the air pressure of the sealed cavity changes along with the position change of the cutting part and is used for regulating the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action.

24. A method of retrofitting a gas density relay according to claim 1, wherein: the edge of the partition is in sealing contact with the inner wall of the sealed cavity.

25. A method of retrofitting a gas density relay according to claim 24, wherein: the partition comprises one of a piston and a sealing partition.

26. A method of retrofitting a gas density relay according to claim 1, wherein: the air path isolation pressure adjusting mechanism is sealed in a cavity or a shell.

27. A method of retrofitting a gas density relay according to claim 1, characterized in that: the online check contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a gas density relay body, or a gas path isolation pressure adjusting mechanism, or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from the contact of the gas density relay body on a circuit through an isolation sampling element; in the check-up state, online check-up contact signal sampling unit cuts off the contact signal control circuit of gas density relay body through keeping apart the sampling element, will the contact of gas density relay body with the intelligence is controlled the unit and is connected.

28. A method of retrofitting a gas density relay according to claim 27, wherein: the isolation sampling element comprises one of a travel switch, a microswitch, a button, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.

29. A method of retrofitting a gas density relay according to claim 1, wherein: the gas circuit partition pressure adjusting mechanism is also provided with a third interface, one end of the valve is connected with the third interface of the gas circuit partition pressure adjusting mechanism, and the other end of the valve is directly or indirectly connected with the electrical equipment; the first interface is located at a position between the second interface and the third interface.

30. The method of retrofitting a gas density relay according to claim 1, further comprising: the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit, and/or the decomposer sensor is respectively connected with the gas density relay body and the intelligent control unit.

31. A method of retrofitting a gas density relay according to claim 1, wherein: further comprising: arranging a temperature adjusting mechanism in or outside a shell of the gas density relay body, wherein the temperature adjusting mechanism is an adjusting mechanism with adjustable temperature, adjusts the temperature rise and fall of a temperature compensation element of the gas density relay body, and further cooperates and/or combines with a gas path blocking pressure adjusting mechanism to enable the gas density relay body to generate contact signal action; and the intelligent control unit is connected with the temperature adjusting mechanism to complete the control of the temperature adjusting mechanism.

32. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjustment mechanism is a heating element disposed proximate to the temperature compensation element.

33. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism comprises a heating element, a heat preservation piece, a temperature controller, a temperature detector and a temperature adjusting mechanism shell.

34. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjustment mechanism includes a heating element and a temperature controller.

35. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism comprises a heating element, a heating power adjuster and a temperature controller.

36. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism comprises a heating element, a refrigerating element, a power regulator and a temperature controller.

37. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism comprises a heating element, a heating power regulator and a constant temperature controller.

38. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism comprises a heating element, a temperature controller and a temperature detector.

39. A method of retrofitting a gas density relay according to claim 31, wherein: the temperature adjusting mechanism is a miniature thermostat.

40. A method of retrofitting a gas density relay according to any of claims 32 to 38, wherein: the number of the heating elements is at least one, and the heating elements comprise one of a silicon rubber heater, a resistance wire, an electric heating tape, an electric heating rod, a hot air blower, an infrared heating device and a semiconductor.

41. A method of retrofitting a gas density relay according to claim 33 or 34 or 35 or 36 or 38, wherein: the temperature controller is connected with the heating element and used for controlling the heating temperature of the heating element.

42. A method of retrofitting a gas density relay according to claim 33 or 34 or 35 or 36 or 38, wherein: the temperature controller comprises a PID controller, or a controller combining PID and fuzzy control.

43. A method of retrofitting a gas density relay according to claim 33 or 34 or 35 or 36 or 38, wherein: the temperature controller comprises a variable frequency controller.

44. A method of retrofitting a gas density relay according to claim 33 or 34 or 35 or 36 or 38, wherein: the temperature controller comprises a PLC controller.

45. The method of retrofitting a gas density relay according to claim 1, further comprising: connecting at least two gas density relay bodies, at least two gas path blocking pressure adjusting mechanisms, at least two online checking contact signal sampling units, an intelligent control unit and a gas density detection sensor to complete online checking of the gas density relay; or,

connecting at least two gas density relay bodies, at least two gas path blocking pressure adjusting mechanisms, at least two online checking contact signal sampling units, at least two intelligent control units and a gas density detection sensor to complete online checking of the gas density relay; or,

at least two gas density relay bodies, at least two gas circuit partition pressure adjusting mechanisms, at least two online checking contact signal sampling units, at least two gas density detection sensors and an intelligent control unit are connected, and online checking of the gas density relay is completed.

46. The method of retrofitting a gas density relay according to claim 1, further comprising: arranging the gas density relay body and the gas path blocking pressure adjusting mechanism on a multi-way connector; or,

the gas circuit partition pressure adjusting mechanism is fixed on the multi-way connector; or,

the gas density relay body, the gas density detection sensor and the gas path partition pressure adjusting mechanism are arranged on the multi-way connector.

47. A method of retrofitting a gas density relay according to claim 46, further comprising: an air supply interface is arranged on the air path partition pressure adjusting mechanism; or, an air supplement interface is arranged on the electrical equipment; or, an air supply interface is arranged on the multi-way joint.

48. The method of retrofitting a gas density relay according to claim 1, further comprising: and a display interface for human-computer interaction is connected with the intelligent control unit, displays the current verification data in real time and supports data input.

49. The method of retrofitting a gas density relay according to claim 1, further comprising: the gas density relay body, and/or the gas density detection sensor, and/or the gas circuit cuts off pressure adjustment mechanism, and/or online check joint signal sampling unit, and/or install the camera that is used for the control on the intelligence accuse unit.

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