A gas path isolation pressure regulating mechanism for online calibration of density relay

Abstract

The present application provides an air path isolation pressure regulating mechanism for online calibration of a density relay, comprising an air path isolation pressure regulating mechanism body, the pressure regulating mechanism body comprising a sealed cavity, a partition, a connecting rod and a driving component, the sealed cavity being provided with a first interface and a second interface; the air path of the air path isolation pressure regulating mechanism body is connected to the air path of the gas density relay through the first interface, and is connected to the air path of the electrical equipment through the second interface; the driving component drives the connecting rod and then drives the partition to move in the sealed cavity to isolate the air path between the first interface and the second interface, the volume of the sealed cavity changes according to the position of the partition, thereby adjusting the pressure rise and fall of the gas density relay, causing the gas density relay to generate a contact signal action, thereby realizing online calibration of the gas density relay, and completing the calibration without the need for maintenance personnel to go to the site, thereby greatly improving the reliability and efficiency of the power grid and reducing costs.

Description

Technical Field

[0001] The invention relates to the field of electric power technology, and in particular to a gas path isolation pressure regulating mechanism for online calibration of a density relay applied to high-voltage and medium-voltage electrical equipment. Background Art

[0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in power departments and industrial and mining enterprises, promoting the rapid development of the power industry. In recent years, with the rapid development of the economy, the capacity of my country's power system has expanded dramatically, and the amount of SF6 electrical equipment has increased. 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 decreases 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 decreases to a certain extent, which will lead to the loss of insulation and arc extinguishing performance. 2) With the participation of some metal objects, SF6 gas can react with water at a high temperature of more than 200°C to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a lot of heat, causing the pressure of the gas chamber to increase. 3) When the temperature drops, excessive moisture may form condensation water, which will significantly reduce the insulation strength of the surface of the insulating parts, and even flashover, causing serious harm. Therefore, the power grid operation regulations stipulate that the density and water content of SF6 gas must be regularly tested before the equipment is put into operation and during operation.

[0003] As unmanned substations develop towards networking and digitalization, and the requirements for remote control and telemetry continue to increase, online monitoring of the gas density and micro-water content of SF6 electrical equipment has important practical significance. With the continuous and vigorous development of China's smart grid, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a vital role in the safety of smart grids. Most high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as leakage), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, online monitoring of the gas density value in SF6 high-voltage electrical equipment has become very common, and the application of gas density monitoring systems (gas density relays) will flourish. The current gas density monitoring system (gas density relay) is basically: 1) Using remote SF6 gas density relays to collect and upload density, pressure and temperature, and realize online monitoring of gas density. 2) Using gas density transmitters to collect and upload density, pressure and temperature, and realize online monitoring of gas density. SF6 gas density relays are core and key components. However, due to the harsh operating environment of high-voltage substations, especially the strong electromagnetic interference, the remote transmission SF6 gas density relay in the currently used gas density monitoring system (gas density relay) is composed of a mechanical density relay and an electronic remote transmission part; in addition, the power grid system using gas density transmitters still retains the traditional mechanical density relay. The mechanical density relay has one, two or three sets of mechanical contacts, which can transmit information to the target device terminal through the contact connection circuit in time when the pressure reaches the alarm, lockout or overpressure state 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 device (usually a computer terminal) in time to realize online monitoring.

[0004] Regular inspection of gas density relays on electrical equipment is a necessary measure to prevent accidents and ensure the safe and reliable operation of electrical equipment. Both the "Electricity Preventive Test Regulations" and the "Twenty-five Key Requirements for Preventing Major Accidents in Electricity Production" require regular inspection of gas density relays. From the actual operation situation, regular inspection of gas density relays is one of the necessary means to ensure the safe and reliable operation of power equipment. Therefore, the inspection of gas density relays has been highly valued and popularized in the power system, and has been implemented by power supply companies, power plants, and large factories and mines. In order to complete the on-site inspection and testing of gas density relays, power supply companies, power plants, and large factories and mines need to be equipped with testers, equipment vehicles, and high-value SF6 gas. Including the operating losses caused by power outages during inspection, it is roughly calculated that the annual inspection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the on-site inspection of the inspectors is not standardized, there are safety hazards. To this end, it is very necessary to innovate in the existing gas density self-calibration gas density relay, especially the gas density online self-calibration gas density relay or system, so that the gas density relay or the monitoring system composed of the gas density online monitoring also has the calibration function of the gas density relay, thereby completing the regular calibration of the (mechanical) gas density relay without the need for maintenance personnel to go to the site, greatly improving work efficiency and reducing costs. Summary of the invention

[0005] The purpose of the present invention is to provide a gas path isolation pressure regulating mechanism for online calibration of density relays used in high-voltage and medium-voltage electrical equipment, which is used to monitor the gas density of gas-insulated or arc-extinguishing electrical equipment while also completing online calibration of the gas density relay, thereby improving efficiency, reducing operating and maintenance costs, and ensuring safe operation of the power grid.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A gas path isolation pressure regulating mechanism for online calibration of a density relay, comprising:

[0008] The gas path isolation pressure regulating mechanism body comprises a sealed cavity, the side wall of the sealed cavity is provided with a first interface connected to the gas path of the gas density relay, and a second interface connected to the gas path of the electrical device, and the relative positions of the first interface and the second interface are staggered;

[0009] A partition piece is provided in the sealed cavity, and the partition piece is in sealing contact with the inner wall of the sealed cavity. The partition piece is connected to a driving component through a connecting piece. The driving component drives the connecting piece and then drives the partition piece to move in the sealed cavity to isolate the gas path between the first interface and the second interface; the gas pressure of the sealed cavity changes with the position of the partition piece.

[0010] Preferably, the first interface is directly or indirectly connected to a gas density relay.

[0011] Preferably, the second interface is directly or indirectly connected to the electrical device.

[0012] Preferably, the partition member and the connecting member are of integrated design and are directly connected to the driving component.

[0013] Preferably, the partition is associated with the drive component by magnetic coupling.

[0014] Preferably, the partition member includes, but is not limited to, one of a piston and a sealing isolation member.

[0015] Preferably, a partition seal is further provided on the partition member, and the partition member is in sealing contact with the inner wall of the sealed cavity through the partition seal.

[0016] Preferably, the driving components include but are not limited to one of magnetism, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, air release valve, pressure pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic element, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, and chemical reaction thrust mechanism.

[0017] Preferably, the driving component is arranged outside the sealed cavity, or the driving component is arranged inside the sealed cavity.

[0018] Preferably, a fifth interface is provided at one end of the sealed cavity, one end of the connecting member is connected to the partition member, and the other end passes through the fifth interface and is connected to the driving component.

[0019] More preferably, the first interface is closer to the fifth interface than the second interface, or the first interface is farther away from the fifth interface than the second interface.

[0020] More preferably, the air path isolation pressure regulating mechanism body also includes a sealing connecting piece, one end of the sealing connecting piece is sealingly connected to the fifth interface, and the other end of the sealing connecting piece is provided with an opening for the connecting piece to extend out; one end of the connecting piece is connected to the isolation piece, and the other end passes through the sealing connecting piece, extends out from the opening and is connected to the driving component; preferably, the sealing connecting piece includes but is not limited to one of a bellows, an airbag, and a sealing ring.

[0021] Furthermore, the other end of the sealing member coupling member or the opening through which the connecting member extends is sealed and connected to the driving end of the driving component.

[0022] Furthermore, the outer surface of the connecting piece is in sealing contact with the opening through which the connecting piece extends.

[0023] Preferably, a connector seal is further provided on the connector, and the connector is in sealing contact with the inner wall of the sealing cavity through the connector seal.

[0024] Preferably, the gas path isolation pressure regulating mechanism further comprises a connecting pipe, and the first interface of the gas path isolation pressure regulating mechanism body is connected to the gas path of the gas density relay through the connecting pipe.

[0025] Preferably, the gas path isolation pressure regulating mechanism body further includes a capillary tube, and the capillary tube is arranged between the first interface and the gas path of the gas density relay.

[0026] Preferably, the gas path isolation pressure regulating mechanism is sealed in a cavity or a housing.

[0027] More preferably, the driving component is arranged in the cavity or the housing.

[0028] More preferably, the driving component includes a bimetallic strip whose deformation changes with temperature and a heating element for heating the bimetallic strip. The bimetallic strip is connected to one end of the sliding element through a connecting element, and the other end of the sliding element is connected to the connecting element. The bimetallic strip is heated by the heating element to produce sufficient deformation to drive the connecting rod and the sliding element to move, drive the connecting element and then drive the partition element to move in the sealed cavity.

[0029] Wherein, the bimetallic strip, the heating element, the connecting element and the sliding element are sealed and arranged in the cavity or the shell, or are directly arranged in the sealed cavity.

[0030] Furthermore, a heat insulating member sealedly connected to an inner wall of the sealed cavity is provided on a side of the partition member facing the heating member.

[0031] Furthermore, the bimetallic strip, the heating element, the connecting element and the sliding element are sealed in the cavity or the shell, and the thermal insulation element separates the sealed cavity and the cavity or the shell into two relatively independent spaces.

[0032] Furthermore, the bimetallic strip, heating element, connecting element and sliding element are sealed and arranged in the sealed cavity, the thermal insulation element divides the internal space of the sealed cavity into two parts, and the bimetallic strip, heating element, connecting element and sliding element are arranged in the space of the thermal insulation element facing away from the partition element.

[0033] Preferably, the gas path isolation pressure regulating mechanism further comprises a gas density detection sensor, which is connected to the gas density relay and is configured to collect the pressure value and temperature value and / or gas density value of the gas density relay; and / or

[0034] The gas path isolation pressure regulating mechanism also includes an online verification contact signal sampling unit, which is connected to the gas density relay and is configured to sample the contact signal of the gas density relay; wherein the contact signal includes an alarm and / or a lockout.

[0035] More preferably, the gas density detection sensor is arranged on the gas density relay; or, the gas density detection sensor is arranged on the main body of the gas path isolation pressure regulating mechanism.

[0036] More preferably, the online verification contact signal sampling unit is arranged on the gas density relay; or, the online verification contact signal sampling unit is arranged on the main body of the gas path isolation pressure regulating mechanism.

[0037] More preferably, the gas density detection sensor is an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.

[0038] More preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter composed of a pressure sensor and a temperature sensor is used; or, a density detection sensor using quartz tuning fork technology is used.

[0039] Furthermore, the pressure sensor is installed on the gas path of the gas density relay or on the main body of the gas path isolation pressure regulating mechanism; the temperature sensor is installed on the gas path of the gas density relay or outside the gas path, or inside the gas density relay, or outside the gas density relay.

[0040] Furthermore, 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 diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure sensor with a Baden tube and an induction coil), a resistance pressure sensor (such as a pressure sensor with a Baden tube and a sliding wire resistor); it can be an analog pressure sensor or a digital pressure sensor; the temperature sensor can be a thermocouple, a thermistor, or a semiconductor type; it can be a contact type or a non-contact type; it can be a thermal resistor and a thermocouple.

[0041] Further, the pressure sensor includes, but is not limited to, a relative pressure sensor and / or an absolute pressure sensor.

[0042] Furthermore, when the pressure sensor is an absolute pressure sensor, it is expressed in absolute pressure values, and its calibration result is the corresponding absolute pressure value at 20°C. When it is expressed in relative pressure values, its calibration result is converted into the corresponding relative pressure value at 20°C. When the pressure sensor is a relative pressure sensor, it is expressed in relative pressure values, and its calibration result is the corresponding relative pressure value at 20°C. When it is expressed in absolute pressure values, 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:

[0043] P 绝对压力 =P 相对压力 +P 标准大气压 .

[0044] More preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay in the following manner: the online verification contact signal sampling unit has at least two independent groups of sampling contacts, can automatically complete the verification of at least two contacts at the same time, and continuously measure without replacing or reselecting contacts; wherein the contacts include but are not limited to one of the following: alarm contact, alarm contact + locking contact, alarm contact + locking 1 contact + locking 2 contact, alarm contact + locking contact + overpressure contact.

[0045] More preferably, the online verification contact signal sampling unit tests the contact signal action value or switching value of the gas density relay at a voltage not less than 24V, that is, during verification, a voltage not less than 24V is applied between the corresponding terminals of the contact signal.

[0046] More preferably, the gas path isolation pressure regulating mechanism also includes: an intelligent control unit, which is respectively connected to the gas path isolation pressure regulating mechanism body, the gas density detection sensor and the online verification contact signal sampling unit, and is configured to complete the control of the gas path isolation pressure regulating mechanism body, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay.

[0047] Furthermore, the intelligent control unit is arranged on the gas density relay; or, the intelligent control unit is arranged on the main body of the gas path isolation pressure regulating mechanism.

[0048] Further, 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 a housing.

[0049] Furthermore, 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 to complete the online monitoring of the gas density of the monitored electrical equipment by the gas density relay.

[0050] Specifically, the intelligent control unit adopts the mean method (average value method) to calculate the gas density value, and the mean method is: within a set time interval, set the collection frequency, and calculate the average value of all N gas density values ​​collected at different time points to obtain its gas density value; or, within a set time interval, set the temperature interval step, calculate the average value of the density values ​​corresponding to N different temperature values ​​collected within the entire temperature range to obtain its gas density value; or, within a set time interval, set the pressure interval step, calculate the average value of the density values ​​corresponding to N different pressure values ​​collected within the entire pressure change range to obtain its gas density value; wherein N is a positive integer greater than or equal to 1.

[0051] Furthermore, the intelligent control unit obtains the gas density value collected by the gas density detection sensor when the contact signal of the gas density relay is actuated or switched, and completes the online verification of the gas density relay; or,

[0052] The intelligent control unit obtains the pressure value and temperature value collected by the gas density detection sensor when the gas density relay generates a contact signal action or switching, and converts it into a pressure value corresponding to 20°C, that is, a gas density value, according to the gas pressure-temperature characteristics, to complete the online calibration of the gas density relay.

[0053] Furthermore, the online verification contact signal sampling unit includes an isolation sampling element, which is controlled by a gas density relay, or a gas path isolation pressure regulating mechanism body, or an intelligent control unit; in a non-verification state, the online verification contact signal sampling unit is relatively isolated from the contacts of the gas density relay in the circuit through the isolation sampling element; in a verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay through the isolation sampling element, and connects the contacts of the gas density relay to the intelligent control unit; preferably, the isolation sampling element 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, an optocoupler, and a thyristor.

[0054] Furthermore, the intelligent control unit automatically controls the entire verification process, including all peripherals, logic, and input and output, based on the embedded system algorithm and control program of the microprocessor.

[0055] Furthermore, the intelligent control unit automatically controls the entire verification process, including all peripherals, logic and input and output, based on the embedded algorithms and control programs of general-purpose computers, industrial computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc.

[0056] Furthermore, the intelligent control unit has an electrical interface, which completes test data storage, and / or test data export, and / or test data printing, and / or data communication with a host computer, and / or input of analog and digital information.

[0057] Furthermore, the intelligent control unit also includes a communication module for realizing long-distance transmission of test data and / or verification results, and the communication mode of the communication module is wired communication or wireless communication; wherein,

[0058] 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;

[0059] The wireless communication method includes one or more of NB-IOT, 2G / 3G / 4G / 5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, and sonar.

[0060] Furthermore, the intelligent control unit is controlled through on-site control and / or through background control.

[0061] Preferably, the gas path isolation pressure regulating mechanism further comprises: a multi-way connector, and the second interface of the gas path isolation pressure regulating mechanism is connected to the gas path of the electrical equipment through the multi-way connector.

[0062] More preferably, the gas path isolation pressure regulating mechanism further comprises: an air supply interface, wherein the air supply interface is arranged on the gas path isolation pressure regulating mechanism body; or, the air supply interface is arranged on the multi-way connector.

[0063] More preferably, the gas path isolation pressure regulating mechanism further includes: a valve, the gas path isolation pressure regulating mechanism body is also provided with a third interface, one end of the valve is connected to the third interface, and the other end of the valve is connected to the electrical equipment through the multi-way connector; the first interface is located between the second interface and the third interface.

[0064] Further, the valve is an electric valve, or a solenoid valve. Preferably, the valve is a permanent magnet solenoid valve.

[0065] Furthermore, the valve is a piezoelectric valve, or a temperature-controlled valve, or a new type of valve made of intelligent memory material and opened or closed by electric heating.

[0066] Furthermore, the valve is closed or opened by bending or pinching the hose.

[0067] Further, the valve is sealed in a cavity or housing.

[0068] Furthermore, the gas path isolation pressure regulating mechanism further includes: a self-sealing valve, wherein the self-sealing valve is installed between the multi-way connector and the valve; or, the valve is installed between the multi-way connector and the self-sealing valve.

[0069] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0070] The present application provides an air path isolation pressure regulating mechanism for online calibration of a density relay, comprising an air path isolation pressure regulating mechanism body, the pressure regulating mechanism body comprising a sealed cavity, a partition, a connecting piece and a driving component, the sealed cavity being provided with a first interface and a second interface; the air path of the air path isolation pressure regulating mechanism body is connected to the air path of the gas density relay through the first interface, and is connected to the air path of the electrical equipment through the second interface; the driving component drives the connecting piece and then drives the partition to move in the sealed cavity to isolate the air path between the first interface and the second interface, the volume of the sealed cavity changes according to the position of the partition, thereby adjusting the pressure rise and fall of the gas density relay, causing the gas density relay to alarm and / or lock the contact signal to actuate, thereby realizing online calibration of the gas density relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0072] Figure 1 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism of the first embodiment;

[0073] Figure 2 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in working state of the second embodiment;

[0074] Figure 3 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in an online verification state according to the second embodiment;

[0075] Figure 4 This is a circuit diagram of a gas path isolation pressure regulating mechanism in working state according to the second embodiment;

[0076] Figure 5 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in working state of the third embodiment;

[0077] Figure 6 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in working state according to the fourth embodiment;

[0078] Figure 7 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in working state of the fifth embodiment;

[0079] Figure 8 This is a structural schematic diagram of a gas path isolation pressure regulating mechanism in working state of Example 6;

[0080] Fig. 9 It is a structural schematic diagram of a gas path isolation pressure regulating mechanism of Example 7 when in a working state. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail 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 and are not used to limit the present invention.

[0082] Embodiment 1:

[0083] Figure 1 This is a schematic diagram of the structure of a gas path isolation pressure regulating mechanism provided in Embodiment 1 of the present invention. Figure 1The gas path isolation pressure regulating mechanism for online calibration of a density relay comprises: a gas path isolation pressure regulating mechanism body 5, the gas path isolation pressure regulating mechanism body 5 comprises a sealed cavity 501, a first interface 506 connected to the gas path of the gas density relay and a second interface 507 connected to the gas path of an electrical device are provided on the side wall of the sealed cavity 501, and the relative positions of the first interface 506 and the second interface 507 are staggered. A partition member 502 is provided in the sealed cavity 501, and the partition member 502 is in sealing contact with the inner wall of the sealed cavity 501, and the partition member 502 includes, but is not limited to, one of a piston and a sealing isolator. A partition seal 503 is also provided on the partition member 502, and the partition member 502 is in sealing contact with the inner wall of the sealed cavity 501 through the partition seal 503. The partition member 502 is connected to the driving component 505 through the connecting member 504, and the driving component 505 drives the connecting member 504 to drive the partition member 502 to move in the sealed cavity 501 to block the gas path between the first interface 506 and the second interface 507. The gas pressure of the sealed cavity 501 changes with the position of the partition member 502, that is, the gas volume of the sealed cavity 501 on both sides of the partition member 502 changes with the position of the partition member 502, so as to adjust the pressure rise and fall of the gas density relay connected to the first interface 506, so that the gas density relay generates a contact signal action; wherein, the contact signal includes an alarm and / or a lock.

[0084] A fifth interface 530 is further provided at one end of the sealing cavity 501 , and the first interface 506 is closer to the fifth interface 530 than the second interface 507 , or the first interface 506 is farther away from the fifth interface 530 than the second interface 507 , that is, the partition piece 502 cannot block the first interface 506 and the second interface 507 at the same time.

[0085] In a preferred embodiment, the air path isolation pressure regulating mechanism body 5 further includes a sealing coupling 508, which is arranged at the fifth interface 530 of the sealing cavity 501, one end of which is sealedly connected to the fifth interface 530, and the other end of which is provided with an opening for the connector 504 to extend out. One end of the connector 504 is connected to the isolation member 502, and the other end passes through the sealing coupling 508, extends out of the opening, and is connected to the driving component 505. The sealing coupling 508 includes, but is not limited to, one of a bellows, an air bag, and a sealing ring. In this embodiment, the sealing coupling 508 is a bellows.

[0086] The sealed cavity 501 may be hollow or partially hollow, and its shape cooperates with the partition piece 502 . When used in conjunction with the partition piece 502 , the gas pressure change can be adjusted.

[0087] Embodiment 2:

[0088] Figure 2 This is a schematic diagram of the structure of a gas path isolation pressure regulating mechanism in working state provided by the second embodiment of the present invention. Figure 2 As shown, a gas path isolation pressure regulating mechanism for online calibration of a density relay comprises: a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism body 5, an online calibration contact signal sampling unit 6, and an intelligent control unit 7. The pressure sensor 2, the temperature sensor 3, and the intelligent control unit 7 are arranged on the gas path isolation pressure regulating mechanism body 5.

[0089] Specifically, the air path isolation pressure regulating mechanism body 5 includes a sealing cavity 501, a isolation member 502, a isolation seal 503, a connecting member 504, a driving member 505, a first interface 506, a second interface 507, a sealing member connecting member 508, a fourth interface 509, and a contact signal interlocking member 5K.

[0090] The partition 502 is arranged in the sealed cavity 501, and the partition 502 is connected to the driving component 505 through the connecting member 504 and the sealing coupling member 508. When in use, the gas circuit of the gas density relay 1 is connected to the first interface 506, and the gas circuit of the electrical device 8 is connected to the second interface 507, that is, the gas circuit of the electrical device 8 is connected to the gas circuit of the gas density relay 1 through the gas circuit partition pressure regulating mechanism body 5. The driving component 505 can be one of, including but not limited to, magnetic force, motor, electric push rod motor, stepper motor, reciprocating motion mechanism, Carnot cycle mechanism, air compressor, compressor, vent valve, pressure pump, booster pump, booster valve, electric air pump, electromagnetic air pump, pneumatic element, magnetic coupling thrust mechanism, heating thrust mechanism, electric heating thrust mechanism, and chemical reaction thrust mechanism. The heating thrust mechanism, such as heating a bimetallic strip, will generate thrust. The driving component 505 moves the partition 502 to cut off the gas circuit of the electrical device 8, isolate the gas density relay 1 from the gas circuit of the electrical device 8, and adjust the gas pressure rise and fall of the gas density relay 1, so that the contacts of the gas density relay 1 can be actuated or reset. The partition 502 is in sealing contact with the inner wall of the sealed cavity 501; the partition 502 includes, but is not limited to, a piston and a sealing isolator. The sealing connector 508 is arranged together with the sealed cavity 501, and the connecting member 504 is connected to the driving component 505 through the sealing connector 508. The sealing connector 508 includes, but is not limited to, a bellows, an airbag, and a sealing ring. The relative positions of the first interface 506 and the second interface 507 of the gas circuit isolation pressure regulating mechanism body 5 are staggered. The second interface 507 of the gas path isolation pressure regulating mechanism body 5 is directly or indirectly connected to the electrical equipment 8, and the first interface 506 of the gas path isolation pressure regulating mechanism body 5 is directly or indirectly connected to the gas density relay 1; the pressure sensor 2 is connected to the fourth interface 509 of the gas path isolation pressure regulating mechanism body 5.

[0091] When in working state, the sealed cavity 501 of the gas path isolation pressure regulating mechanism body 5 is connected to the gas path of the gas density relay 1 and the electrical equipment 8; the online verification contact signal sampling unit 6 is respectively connected to the gas density relay 1 and the intelligent control unit 7; the pressure sensor 2, the temperature sensor 3 and the gas path isolation pressure regulating mechanism body 5 are respectively connected to the intelligent control unit 7; the isolation sampling element of the online verification contact signal sampling unit 6 is set corresponding to the contact signal interlocking piece 5K. During verification, the contact signal interlocking piece 5K can cut off the contact signal control circuit of the gas density relay 1 to ensure that the contact action signal of the gas density relay 1 will not be uploaded during verification, thereby not affecting the safe operation of the power grid. The isolation 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.

[0092] The online verification contact signal sampling unit 6 described in this case adopts an isolation sampling element travel switch; the contact signal interlocking piece 5K can be composed of a spring, one end of which is connected to the driving component 505 of the gas path isolation pressure regulating mechanism body 5, and the other end is against the isolation sampling element travel switch of the online verification contact signal sampling unit 6; when verification is required, the intelligent control unit 7 controls the driving component 505 to move, and the driving component 505 drives the contact signal interlocking piece 5K (spring) to move, and the contact signal interlocking piece 5K (spring) causes the isolation sampling element travel switch contact of the online verification contact signal sampling unit 6 to actuate, refer to Figure 4 At this time, the isolated sampling element travel switch contacts 61 and 62 of the online verification contact signal sampling unit 6 are actuated, cutting off the contact signal control loop of the gas density relay, and at the same time connecting the contact PJ of the gas density relay to the intelligent control unit 7. The online verification contact signal sampling unit 6 in this case is composed of the isolated sampling element travel switch.

[0093] The above-mentioned gas density relay 1 includes: a bimetallic compensated gas density relay, a gas compensated gas density relay, or a bimetallic and gas compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a gas density relay with an indication (a gas density relay with a pointer display, or a gas density relay with a digital display, a gas density relay with a liquid crystal display), a gas density relay without an indication (i.e., a density switch); a SF6 gas density relay, a SF6 mixed gas density relay, a N2 gas density relay, other gas density relays, and the like.

[0094] like Figure 4As shown, the intelligent control unit 7 is mainly composed of a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) can 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, an industrial control mainboard, an embedded main control board, and other intelligent integrated circuits. The power supply 72 (U2) can be a switching power supply, an AC 220V, a DC power supply, an LDO, a programmable power supply, solar energy, a storage battery, a rechargeable battery, a battery, an electric field induction power supply, a magnetic field induction power supply, a wireless charging power supply, a capacitor power supply, and the like.

[0095] Types of pressure sensor 2: absolute pressure sensor, relative pressure sensor, or absolute pressure sensor and relative pressure sensor, the number can be several. Pressure sensor 2 can be in the form of diffused silicon pressure sensor, MEMS pressure sensor, chip pressure sensor, coil induction pressure sensor (such as Baden tube with induction coil pressure measurement sensor), resistance pressure sensor (such as Baden tube with 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 sensing elements such as pressure sensors and pressure transmitters, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistance strain gauge, ceramic strain gauge).

[0096] The temperature sensor 3 can be: a thermocouple, a thermistor, a semiconductor type; it can be a contact type or a non-contact type; it can be a thermal resistor or a thermocouple. In short, temperature acquisition can be performed using various temperature sensing elements such as a temperature sensor, a temperature transmitter, etc.

[0097] The main body 5 of the gas path isolation pressure regulating mechanism of this embodiment is mainly composed of a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a seal coupling 508, a fourth interface 509, and a contact signal interlocking component 5K. The sealed cavity 501 includes a seal coupling 508, and the seal coupling 508 is composed of a bellows. The partition 502 provided with a partition seal 503 is arranged in the sealed cavity 501, and the partition 502 is connected to the driving component 505 through the connector 504 and the seal coupling 508. The driving component 505 is composed of a motor, or an electric push rod motor, or a stepping motor, and a reciprocating motion mechanism. The partition 502 is in sealing contact with the inner wall of the sealed cavity 501 through the partition seal 503; the partition 502 includes, but is not limited to, one of a piston and a sealing isolation component. Since the sealing member coupling member 508 is arranged together with the sealing cavity 501, the connecting member 504 is connected to the driving member 505 through the sealing member coupling member 508, ensuring that the entire calibration process is sealed.

[0098] like Figure 4As shown, the online 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 1. That is, the basic requirements or functions of the online verification contact signal sampling unit 6 are: 1) It does not affect the safe operation of the electrical equipment during verification. That is, during verification, when the contact signal of the gas density relay 1 is activated, it will not affect the safe operation of the electrical equipment; 2) The contact signal control circuit of the gas density relay 1 does not affect the performance of the gas density relay, especially the performance of the intelligent control unit 7, and will not damage the gas density relay or affect the test work.

[0099] The basic requirements or functions of the intelligent control unit 7 are: to complete the control and signal collection of the gas path isolation pressure regulating mechanism body 5 through the intelligent control unit 7. To achieve: to be able to isolate the gas path between the first interface 506 and the second interface 507, and then to isolate the gas path between the gas density relay 1 and the electrical equipment 8 during verification, and to detect the pressure value and temperature value when the contact signal of the gas density relay 1 is actuated, and convert them into the corresponding pressure value P at 20°C. 20 (density value), that is, the contact action value P of the gas density relay 1 can be detected D20 , complete the calibration of gas density relay 1. Alternatively, the density value P when the contact signal of gas density relay 1 is actuated can be directly detected. D20 , complete the calibration of gas density relay 1.

[0100] Of course, the intelligent control unit 7 can also achieve: complete test data storage; and / or test data export; and / or test data can be printed; and / or data communication with the host computer can be performed; and / or analog and digital information can be input. The intelligent control unit 7 also includes a communication module, through which the long-distance transmission of test data and / or verification results and other information is realized; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the density value at that time to complete the rated pressure value verification of the gas density relay 1. At the same time, through the test of the rated pressure value of the gas density relay 1, the self-verification work between the gas density relay 1, the pressure sensor 2, and the temperature sensor 3 can be completed to achieve maintenance-free.

[0101] The electrical equipment 8 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 charging cabinets, ring main cabinets, etc.

[0102] The gas density relay 1, the pressure sensor 2, the temperature sensor 3, the gas path isolation pressure regulating mechanism body 5, the online verification contact signal sampling unit 6, and the intelligent control unit 7 can be flexibly arranged as needed. For example, the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 can be arranged together; or the pressure sensor 2 and the gas path isolation pressure regulating mechanism body 5 can be arranged together. In short, the settings between them can be flexibly arranged and combined.

[0103] The working principle of a gas path isolation pressure regulating mechanism for online calibration of a density relay is as follows: the gas path of the gas density relay 1 is connected to the first interface 506 of the gas path isolation pressure regulating mechanism body 5, and the gas path of the electrical device 8 is connected to the second interface 507 of the gas path isolation pressure regulating mechanism body 5. The intelligent control unit 7 monitors the gas pressure and temperature of the electrical device 8 according to the pressure sensor 2 and the temperature sensor 3, and obtains the corresponding 20°C pressure value P 20 (i.e., gas density value, i.e., online monitoring gas density value). When it is necessary to calibrate gas density relay 1, if the gas density value P 20 ≥Set safety verification density value P S The gas density relay (or density monitoring device) 1 issues an instruction, that is, the driving component 505 of the gas path isolation pressure regulating mechanism body 5 is driven by the intelligent control unit 7, and the driving component 505 pushes the connecting member 504 to move, thereby causing the isolation member 502 and the isolation sealing member 503 to move toward the first interface 506 and the second interface 507. Figure 3 and Figure 4 As shown, during the movement, the contact signal sampling unit 6 cuts off the control loop of the contact signal of the gas density relay 1 through the contact signal interlocking piece 5K, and connects the contact of the gas density relay 1 to the intelligent control unit 7. Because the gas density relay 1 has been tested for the gas density value P before the start of the test 20 ≥Set safety verification density value P SThe monitoring and judgment shows that the gas of the electrical equipment 8 is within the safe operating range, and the gas leakage is a slow process, so it is safe during the verification. With the movement of the partition member 502 and the partition seal 503, the first interface 506 and the second interface 507 are isolated from each other under the isolation effect of the partition member 502 and the partition seal 503. That is, the partition member 502 and the partition sealing member 503 of the gas path partition pressure regulating mechanism body 5 move toward the first interface 506 and the second interface 507 under the action of the driving component 505. When the partition member 502 passes the first interface 506, the partition member 502 isolates the gas path connection between the first interface 506 and the second interface 507, and as the partition member 502 continues to move toward the second interface 507, the volume of the sealed cavity 501 changes, and the pressure of the gas density relay 1 can be adjusted to slowly reduce the gas pressure, so that the gas density relay 1 has a contact action, and its contact action is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 collects the pressure value P and the temperature value T of the pressure sensor 2 and the temperature sensor 3 when the contact is in action, and then calculates the gas density value P 20 , or directly obtain the gas density value P 20 , detect the contact signal action value P of gas density relay 1 D20 , complete the calibration of the contact signal action value of the gas density relay 1. That is, the intelligent control unit 7 converts the pressure value P corresponding to 20°C according to the gas pressure-temperature relationship characteristics. 20 (density value), the contact action value P of gas density relay 1 can be detected D20 After all the contact action values ​​of the alarm and / or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 drives the gas path isolation pressure adjustment mechanism body 5, and the isolation member 502 moves toward the first interface 506. The volume of the sealed cavity 501 changes, and the pressure of the gas density relay 1 can be adjusted to slowly increase the gas pressure, so that the gas density relay 1 resets the contacts. The contact reset is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and the temperature value T when the contact is reset. 20 , or directly obtain the gas density value P 20 , detect the contact signal return value P of the gas density relay F20 , complete the contact signal return value P of gas density relay 1 F20 The calibration can be repeated for several times (for example, 2 to 3 times), and then the average value is calculated, thus completing the calibration of the gas density relay 1.

[0104] When all the contact signal verification work is completed, the intelligent control unit 7 controls the gas path isolation pressure regulating mechanism body 5, and the isolation member 502 of the gas path isolation pressure regulating mechanism body 5 moves under the action of the driving component 505, so that the gas paths of the first interface 506 and the second interface 507 of the gas path isolation pressure regulating mechanism body 5 are connected to each other (such as Figure 2 As shown in FIG. 5 , and with the movement of the contact signal interlocking member 5K, the online verification contact signal sampling unit 6 is adjusted to the working state, and the control circuit of the contact signal of the gas density relay 1 resumes the normal working state. Figure 2 As shown: At this time, the gas paths of the first interface 506 and the second interface 507 of the gas path isolation pressure regulating mechanism body 5 are interconnected, that is, the gas density relay 1 is connected to the electrical equipment 8 on the gas path, and the gas density relay 1 normally monitors the gas density of the gas chamber of the electrical equipment 8, and can monitor the gas density of the electrical equipment 8 online. That is, the density monitoring circuit of the gas density relay 1 works normally, and the gas density relay 1 safely monitors the gas density of the electrical equipment 8, so that the electrical equipment 8 works safely and reliably. In this way, it is convenient to complete the online verification of the gas density relay 1, and at the same time, the safe operation of the electrical equipment 8 will not be affected when the gas density relay 1 is verified online.

[0105] When the gas density relay 1 completes the verification work, the gas density relay will make a judgment and can announce the test results in a flexible way. Specifically, it can: 1) The gas density relay can announce on-site, such as through indicator lights, digital or LCD displays; 2) Or the gas density relay can upload through online remote communication, such as uploading to the background of the online monitoring system; 3) Or upload wirelessly, upload to a specific terminal, such as wirelessly uploading to a mobile phone; 4) Or upload through other channels; 5) Or upload abnormal results through an alarm signal line or a dedicated signal line; 6) Upload alone, or upload with other signals. In short, after the gas density relay completes the online verification of the gas density relay 1, if there is an abnormality, it can automatically issue an alarm, which can be uploaded to the remote end, or can be sent to a designated receiver, such as to a mobile phone. Alternatively, after the gas density relay 1 completes the verification of the gas density relay 1, if there is an abnormality, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay 1 to the remote end (monitoring room, background monitoring platform, etc.), and can also display the notice on-site. The simple version of the online calibration of the gas density relay can upload the abnormal calibration results through the alarm signal line. It can be uploaded in a certain pattern. For example, when abnormal, a contact is connected in parallel with the alarm signal contact, and it is closed and disconnected regularly, and the status can be obtained through analysis; or it can be uploaded through an independent calibration signal line. Specifically, it can be uploaded when the status is good, or when there is a problem, or it can be uploaded through remote density online monitoring, or the calibration results can be uploaded through a separate calibration signal line, or through local display, local alarm, or wireless upload, and upload through the Internet with a smart phone. The communication mode is wired or wireless. The wired communication mode can be RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cable, PLC power carrier, etc.; the wireless communication mode can be 2G / 3G / 4G / 5G, 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), etc. In short, multiple modes and multiple combinations can be used to fully guarantee the reliable performance of the gas density relay.

[0106] The gas density relay has a safety protection function. Specifically, when the gas density value is lower than the set value, the gas density relay will automatically stop online verification of the gas density relay 1 and send out a warning signal. For example, when the gas density value of the equipment is less than the set value P S For example, online calibration can only be performed when the gas density value of the equipment is ≥ (alarm pressure value + 0.02MPa).

[0107] The gas density relay can be calibrated online according to the set time, and can also be calibrated online according to the set temperature (such as extreme high temperature, high temperature, extreme low temperature, low temperature, normal temperature, 20 degrees, etc.). When calibrating high temperature, low temperature, normal temperature, and 20°C ambient temperature online, the error judgment requirements are different. For example, when calibrating at 20°C ambient temperature, the accuracy requirement of the gas density relay can be 1.0 or 1.6, and it can be 2.5 at high temperature. It can be implemented according to the temperature requirements and relevant standards. For example, according to the temperature compensation performance provisions in Article 4.8 of DL / T 259 "Calibration Procedure for Sulfur Hexafluoride Gas Density Relay", the accuracy requirements corresponding to each temperature value.

[0108] The gas density relay can compare the error performance of the density relay at different temperatures and different time periods. That is, the comparison within the same temperature range at different periods can determine the performance of the gas density relay and electrical equipment. It can compare various historical periods and compare history with the present.

[0109] The gas density relay can be calibrated repeatedly for multiple times (for example, 2 to 3 times), and the average value can be calculated based on the calibration results each time. If necessary, the gas density relay can be calibrated online at any time.

[0110] The gas density relay has the functions of pressure and temperature measurement and software conversion. Under the premise of not affecting the safe operation of electrical equipment, the alarm and / or locking contact action value and / or return value of the gas density relay 1 can be detected online. Of course, the return value of the alarm and / or locking contact signal can also be not tested according to requirements. At the same time, the gas density relay can also monitor the gas density value, pressure value, and / or temperature value of the electrical equipment online, and upload them to the target device for online monitoring.

[0111] Embodiment three:

[0112] like Figure 5As shown, a gas path isolation pressure regulating mechanism provided by Embodiment 3 of the present invention includes: a pressure sensor 2, a temperature sensor 3, a valve 4, a gas path isolation pressure regulating mechanism body 5, an online calibration contact signal sampling unit 6, an intelligent control unit 7, and a multi-way connector 9. Among them, the gas path isolation pressure regulating mechanism body 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a third interface 511, a connector seal 510, and a cavity (or shell) 512. One end of the valve 4 is connected to the third interface 511, and the other end of the valve 4 is connected to the multi-way connector 9. The first interface 506 is arranged at a position between the second interface 507 and the third interface 511. The connector 504 is sealed with the sealed cavity 501 through the connector seal 510; wherein the partition 502 is arranged in the sealed cavity 501, and the partition 502 is connected with the driving component 505 through the connector 504; the connector 504, the driving component 505, and the connector seal 510 are sealed in the cavity (or shell) 512. The cavity (or shell) 512 and the sealed cavity 501 have good sealing, that is, the cavity (or shell) 512 ensures that the gas path isolation pressure regulating mechanism body 5 has good sealing performance.

[0113] When in use, the gas circuit of the gas density relay 1 is connected to the first interface 506 of the gas circuit isolation pressure regulating mechanism body 5, and the gas circuit of the electrical equipment 8 is connected to the second interface 507 of the gas circuit isolation pressure regulating mechanism body 5. In this embodiment, the gas circuit isolation pressure regulating mechanism body 5 is installed on the multi-way connector 9; the pressure sensor 2, the temperature sensor 3, the online calibration contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay 1. The pressure sensor 2 is connected to the gas density relay 1 on the gas circuit. The pressure sensor 2, the temperature sensor 3, the valve 4 and the gas circuit isolation pressure regulating mechanism body 5 are respectively connected to the intelligent control unit 7. The multi-way connector 9 can also be connected to a gas replenishment interface.

[0114] The control of valve 4 can adopt a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; it can act according to the predetermined requirements under the action of pressure, temperature or other forms of sensor signals, or simply open or close without relying on sensor signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts move up and down, slide, swing or rotate, thereby changing the size of its flow channel area to achieve its control function. The valve 4 can be an automatic valve type, a power-driven valve type and a manual valve type according to the drive 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, manual or semi-automatic. The calibration 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-disassembly valve, and is connected in an integrated or separate manner. The valve 4 can be normally open or normally closed, one-way or two-way as required. In short, the gas path is opened or closed by the valve 4. The valve 4 can be: a solenoid valve, an electric-controlled ball valve, an electric valve, an electric-controlled proportional valve, etc.

[0115] The difference from the second embodiment is that the main body 5 of the gas path isolation pressure regulating mechanism of this embodiment is mainly that the connector 504 is sealed with the sealed cavity 501 through the connector seal 510; the connector 504, the driving component 505, and the connector seal 510 are sealed in the cavity (or shell) 512. The cavity (or shell) 512 and the sealed cavity 501 have a good seal, that is, the cavity (or shell) 512 ensures that the main body 5 of the gas path isolation pressure regulating mechanism has a good sealing performance. The biggest difference is: this embodiment also includes a valve 4, and the valve 4 is used to complete the calibration of the gas density relay 1 with the overpressure alarm contact function. As in the second embodiment, after the alarm and / or locking contact action value and / or return value of the gas density relay 1 is detected online, the partition 502 is adjusted to (or automatically set to) a suitable position, such as crossing 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. At this time, the gas of the electrical equipment 8 enters the gas density relay 1, so that the pressure of the gas density relay 1 is increased to the set pressure value or directly increased to the gas pressure value of the electrical equipment 8, and then the valve 4 is closed by the intelligent control unit 7. Then, the gas path is cut off by the intelligent control unit 7. The pressure regulating mechanism body 5 moves toward the third interface 511, and the sealed cavity 501 ( Figure 5The volume of the right part of the middle partition 502 changes, which can adjust the pressure of the gas density relay 1, so that the gas pressure rises slowly, so that the overpressure alarm contact of the gas density relay 1 is actuated, and the signal of the overpressure alarm contact actuation is transmitted to the intelligent control unit 7 through the online verification contact signal sampling unit 6. The intelligent control unit 7 obtains the gas density value P according to the pressure value P and temperature value T when the overpressure alarm contact is actuated. 20 , or directly obtain the gas density value P 20 , detect the contact signal value P of the overpressure alarm contact of gas density relay 1 C20 , complete the overpressure alarm contact signal value P of gas density relay 1 C20 The gas path isolation pressure regulating mechanism body 5, under the control of the intelligent control unit 7, causes the driving component 505 to push the isolation member 502 to move, causing the sealed cavity 501 to change in volume, thereby completing the pressure drop, and detecting the contact signal value P of the overpressure alarm contact of the gas density relay 1 to reset. CF20 , complete the overpressure alarm contact signal return value P of gas density relay 1 CF20 calibration work.

[0116] Embodiment 4:

[0117] like Figure 6 As shown, a gas path isolation pressure regulating mechanism provided by the fourth embodiment of the present invention includes: a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism body 5, an online verification contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9 and a gas supply interface 10. The gas path isolation pressure regulating mechanism body 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connecting member 504, a power driving member 513, a driven member 514, a first interface 506, and a second interface 507. The gas density relay 1 is installed on the first interface 506 of the gas path isolation pressure regulating mechanism body 5, and the electrical device 8 is installed on the second interface 507 of the gas path isolation pressure regulating mechanism body 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 isolation pressure regulating mechanism body 5 is installed on the multi-way connector 9, and the pressure sensor 2 is connected to the gas density relay 1 on the gas path; the gas supply interface 10 is arranged on the multi-way connector 9. The pressure sensor 2 and the temperature sensor 3 are connected to the intelligent control unit 7 ; the gas path isolation pressure regulating mechanism body 5 is connected to the intelligent control unit 7 .

[0118] The biggest difference from the second embodiment is that the driving component of the gas path partition pressure regulating mechanism body 5 of this embodiment is composed of a power driving part 513 and a driven part 514, and the partition part 502, the connecting part 504, and the driven part 514 are arranged inside the sealed cavity 501. The partition part 502 is connected to the driven part 514 through the connecting part 504. According to the control of the intelligent control unit 7, the power driving part 513 pushes the driven part 514 to move, thereby moving the partition part 502, causing the sealed cavity 501 to change in volume, and then completing the pressure rise and fall. The power driving part 513 is arranged outside the sealed cavity 501, and the driven part 514 is arranged inside the sealed cavity 501. The power driving part 513 applies electromagnetic force to push the driven part 514 to move, that is, the driven part 514 and the partition part 502 are moved by magnetic force between the driven part 514 and the power driving part 513. This embodiment can be implemented in combination with a magnetically coupled rodless cylinder.

[0119] Embodiment five:

[0120] like Figure 7 As shown, a gas path isolation pressure regulating mechanism provided in the fifth embodiment of the present invention includes: a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism body 5, an online verification contact signal sampling unit 6, and an intelligent control unit 7. The gas density relay 1 is installed on the first interface 506 of the gas path isolation pressure regulating mechanism body 5, and the electrical equipment 8 is installed on the second interface 507 of the gas path isolation pressure regulating mechanism body 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 on the gas density relay 1. Furthermore, the gas path isolation pressure regulating mechanism body 5 includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component 505, a first interface 506, a second interface 507, a seal coupling 508, and a cavity (or housing) 512; the seal coupling 508 can be composed of a bellows. The connector 504, the driving component 505, and the sealing coupling 508 are sealed and arranged inside the cavity (or housing) 512. The second interface 507 of the gas path isolation pressure regulating mechanism body 5 can be directly or indirectly connected to the electrical device 8 through a joint.

[0121] The difference from the second embodiment is that the connector 504, the driving component 505, and the sealing connector 508 of this embodiment are sealed and arranged inside the cavity (or housing) 512, which further improves the sealing performance and ensures the safe operation of the power grid. In addition, the partition 502 can be directly connected to the driving component 505 through the sealing connector 508; or the partition 502 and the connector 504 are designed as an integrated whole and directly connected to the driving component 505.

[0122] Embodiment six:

[0123] like Figure 8 As shown, a gas path isolation pressure regulating mechanism provided by Embodiment 6 of the present invention comprises: a pressure sensor 2, a temperature sensor 3, a gas path isolation pressure regulating mechanism body 5, an online verification contact signal sampling unit 6, and an intelligent control unit 7. The gas density relay 1 is installed on the first interface 506 of the gas path isolation pressure regulating mechanism body 5, and the electrical device 8 is installed on the second interface 507 of the gas path isolation pressure regulating mechanism body 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 on the gas density relay 1. Furthermore, the main body 5 of the gas path isolation pressure regulating mechanism includes a sealed cavity 501, a partition 502, a partition seal 503, a connector 504, a driving component composed of a heating device 516 and a bimetallic strip 515 (i.e., an electric heating thrust generating mechanism), a first interface 506, a second interface 507, a connecting member 517, a sliding member 518, a heat insulating member 519, and a cavity (or a housing); the connecting member 504, the driving component composed of the heating device 516 and the bimetallic strip 515, the connecting member 517 and the sliding member 518 are sealed and arranged inside the cavity (or housing). The second interface 507 of the main body 5 of the gas path isolation pressure regulating mechanism can be directly or indirectly connected to the electrical device 8 through a joint.

[0124] The difference from the first embodiment is that the driving component, connecting component 517 and sliding component 518 composed of the connecting component 504, the heating device 516 and the bimetallic strip 515 of this embodiment are sealed inside the cavity (or housing), further improving the sealing performance and ensuring the safe operation of the power grid. The driving component of this embodiment is composed of the heating device 516 and the bimetallic strip 515. When the heating device 516 is powered on and heated, the bimetallic strip 515 is deformed by heat, driving the connecting component 517 and the sliding component 518 to move, thereby driving the connecting component 504 to move, thereby driving the partitioning component 502 to move, completing the isolation of the gas path and the regulation of pressure.

[0125] Embodiment seven:

[0126] like Fig. 9As shown, a gas density relay or gas density monitoring device with an online self-calibration function provided by Embodiment 7 of the present invention includes: a gas density relay 1, a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a gas path isolation pressure regulating mechanism body 5, an online calibration contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, a gas supply interface 10, and a self-sealing valve 11. One end of the self-sealing valve 11 is sealed and connected to the electrical equipment 8, and the other end of the self-sealing valve 11 is connected to the multi-way connector 9. The second pressure sensor 22, the second temperature sensor 32, the gas path isolation pressure regulating mechanism body 5, and the gas supply interface 10 are arranged on the multi-way connector 9; the first pressure sensor 21 and the first temperature sensor 31 are arranged on the gas path isolation pressure regulating mechanism body 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 1 are connected to the gas path isolation pressure regulating mechanism body 5 on the gas path; the gas path isolation pressure regulating mechanism body 5 is connected to the intelligent control unit 7 .

[0127] Different from the first embodiment, there are two pressure sensors, namely the first pressure sensor and the second pressure sensor; there are two temperature sensors, namely the first temperature sensor and the second temperature sensor. This embodiment provides multiple pressure sensors and temperature sensors, the purpose of which is that: 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 ​​monitored by the first temperature sensor and the second temperature sensor can be compared and verified with each other; the density value P1 monitored by the first pressure sensor and the first temperature sensor 20 , and the density value P2 monitored by the second pressure sensor and the second temperature sensor 20 Compare and verify each other; even the density value Pe of the rated value of the gas density relay can be obtained online 20 , compare and check each other. Further ensure the reliability of gas density relay or gas density monitoring device, automatically monitor and compare, and achieve maintenance-free.

[0128] It can also contain a moisture sensor for monitoring the moisture content of electrical equipment and a decomposition product sensor for monitoring the decomposition product content.

[0129] In addition, the technical product of the present invention can 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 stop checking the gas density relay and send a warning signal. For example, when the gas density value of the device is less than the set value, it will not be checked. Only when the gas density value of the device is ≥ (locking pressure + 0.02MPa), can it be checked. The docking point alarm has a status indication. 2) Or during the calibration, 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 stop checking the gas density relay and send a warning signal (leakage). For example, when the gas density value of the device is less than the set value (locking pressure + 0.02MPa), it will not be checked. The set value can be set arbitrarily according to needs. At the same time, the gas density relay also has mutual verification of multiple pressure sensors and temperature sensors, as well as mutual verification of sensors and gas density relays, 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 monitored by the first pressure sensor and the first temperature sensor 20 , and the density value P2 monitored by the second pressure sensor and the second temperature sensor 20 Compare and verify each other; even verify the density value Pe of the rated value of the gas density relay 20 , compare and verify each other.

[0130] In summary, the present application provides a gas path isolation pressure regulating mechanism for online calibration of a density relay, including a gas path isolation pressure regulating mechanism body, the pressure regulating mechanism body including a sealed cavity, a partition, a connector and a driving component, and a first interface and a second interface are provided on the sealed cavity; the gas path of the gas path isolation pressure regulating mechanism body is connected to the gas path of the gas density relay through the first interface, and is connected to the gas path of the electrical equipment through the second interface; the driving component drives the connector and then drives the partition to move in the sealed cavity to isolate the gas path between the first interface and the second interface, and the volume of the sealed cavity changes according to the position of the partition, thereby adjusting the pressure rise and fall of the gas density relay, causing the gas density relay to alarm, and / or lock the contact signal action, thereby realizing the online calibration of the gas density relay. The installation positions of its pressure sensor, temperature sensor, gas path isolation pressure regulating mechanism body, online calibration contact signal sampling unit, and intelligent control unit can be flexibly combined. For example: pressure sensors, temperature sensors, online calibration contact signal sampling units, and intelligent control units can be combined together in an integrated design or in a split design; they can be installed on the housing or on a multi-way connector, or they can be connected together through connecting pipes. Valves can be directly connected to electrical equipment, or they can be connected through self-sealing valves or air pipes. Pressure sensors and temperature sensors can be combined together in an integrated design; online calibration contact signal sampling units and intelligent control units can be combined together in an integrated design. In short, the structure is not limited to one style.

[0131] The application has a compact and reasonable structure, and each component has good rust and shock resistance, is firmly installed, and is reliable to use. The connection and disassembly of each pipeline of a gas path isolation pressure regulating mechanism are easy to operate, and the equipment and components are easy to maintain. The application can complete the calibration of the gas density relay without the need for maintenance personnel to go to the site, which greatly improves the reliability of the power grid, improves efficiency, and reduces costs.

[0132] The specific embodiments of the present invention are described in detail above, but they are only 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 made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A gas path isolation pressure regulating mechanism for online calibration of a density relay, characterized in that: include: The gas path isolation pressure regulating mechanism body comprises a sealed cavity, the side wall of the sealed cavity is provided with a first interface connected to the gas path of the gas density relay, and a second interface connected to the gas path of the electrical device, and the relative positions of the first interface and the second interface are staggered; A partition piece is provided in the sealed cavity, the partition piece is in sealing contact with the inner wall of the sealed cavity, the partition piece is connected to a driving component via a connecting piece, the driving component drives the connecting piece and then drives the partition piece to move in the sealed cavity to cut off the gas path between the first interface and the second interface; the gas pressure in the sealed cavity changes with the position of the partition piece; Among them, a fifth interface is provided at one end of the sealing cavity, one end of the connecting piece is connected to the partition piece, and the other end passes through the fifth interface and is connected to the driving component; the first interface is closer to the fifth interface than the second interface, or the first interface is farther away from the fifth interface than the second interface; the air path isolation pressure regulating mechanism body also includes a sealing connecting piece, one end of the sealing connecting piece is sealed and connected to the fifth interface, and the other end of the sealing connecting piece is provided with an opening for the connecting piece to extend out; one end of the connecting piece is connected to the partition piece, and the other end passes through the sealing connecting piece, extends out from the opening and is connected to the driving component.

2. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The partition member includes one of a piston and a sealing isolation member.

3. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The driving component includes one of a magnetic force, a motor, a Carnot cycle mechanism, a compressor, a vent valve, a boost pump, a boost valve, a pneumatic element, a heating thrust generating mechanism, and a chemical reaction thrust generating mechanism.

4. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The driving component is arranged outside the sealed chamber, or the driving component is arranged inside the sealed chamber.

5. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The sealing component connecting piece includes one of a bellows, an air bag and a sealing ring.

6. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The other end of the sealing member coupling member or the opening through which the connecting member extends is sealedly connected to the driving end of the driving component.

7. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The outer surface of the connecting piece is in sealing contact with the opening through which the connecting piece extends.

8. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The gas path isolation pressure regulating mechanism is sealed in a housing.

9. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 8, characterized in that: The driving component is disposed in the housing.

10. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 8, characterized in that: The driving component includes a bimetallic strip whose deformation changes with temperature and a heating element for heating the bimetallic strip. The bimetallic strip is connected to one end of the sliding element through a connecting element, and the other end of the sliding element is connected to the connecting element. The bimetallic strip is heated by the heating element to produce sufficient deformation to drive the connecting rod and the sliding element to move, drive the connecting element and then drive the partition element to move in the sealed cavity.

11. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 10, characterized in that: A heat insulating member which is sealed and connected to the inner wall of the sealed cavity is provided on one side of the partition member facing the heating member.

12. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: The gas path isolation pressure regulating mechanism further includes a gas density detection sensor, which is connected to the gas density relay and is configured to collect the pressure value and temperature value and / or gas density value of the gas density relay; and / or, The gas path isolation pressure regulating mechanism also includes an online verification contact signal sampling unit, which is connected to the gas density relay and is configured to sample the contact signal of the gas density relay; wherein the contact signal includes an alarm and / or a lockout.

13. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 12, characterized in that: The gas density detection sensor is arranged on the gas density relay, or the gas density detection sensor is arranged on the gas path isolation pressure regulating mechanism body; the online verification contact signal sampling unit is arranged on the gas density relay, or the online verification contact signal sampling unit is arranged on the gas path isolation pressure regulating mechanism body.

14. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 12, characterized in that: The gas density detection sensor is an integrated structure.

15. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 14, characterized in that: The gas density detection sensor is a gas density transmitter with an integrated structure.

16. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 12, characterized in that: The gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or, Use a gas density transmitter consisting of a pressure sensor and a temperature sensor; or, Density sensor using quartz tuning fork technology.

17. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 16, characterized in that: The pressure sensor is installed on the gas path of the gas density relay or on the main body of the gas path isolation pressure regulating mechanism; the temperature sensor is installed on the gas path of the gas density relay or outside the gas path, or inside the gas density relay, or outside the gas density relay.

18. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 12, characterized in that: It also includes an intelligent control unit, which is respectively connected to the gas path isolation pressure regulating mechanism body, the gas density detection sensor and the online verification contact signal sampling unit, and is configured to complete the control of the gas path isolation pressure regulating mechanism body, pressure value collection and temperature value collection, and / or gas density value collection, and detect the contact signal action value and / or contact signal return value of the gas density relay.

19. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 18, characterized in that: The intelligent control unit is arranged on the gas density relay; or, the intelligent control unit is arranged on the main body of the gas path isolation pressure regulating mechanism.

20. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 18, characterized in that: The online verification contact signal sampling unit and the intelligent control unit are arranged together.

21. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 20, characterized in that: The online verification contact signal sampling unit and the intelligent control unit are sealed in a housing.

22. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 18, characterized in that: The online verification contact signal sampling unit includes an isolation sampling element, which is controlled by a gas density relay, or a gas path isolation pressure regulating mechanism body, or an intelligent control unit; in a non-verification state, the online verification contact signal sampling unit is relatively isolated from the contacts of the gas density relay in the circuit through the isolation sampling element; in a verification state, the online verification contact signal sampling unit cuts off the contact signal control circuit of the gas density relay through the isolation sampling element, and connects the contacts of the gas density relay to the intelligent control unit.

23. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 22, characterized in that: The isolation sampling element includes one of an electric switch, a displacement switch, an optical coupler, and a thyristor.

24. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 1, characterized in that: It also includes a multi-way connector, and the second interface of the gas circuit isolation pressure regulating mechanism is connected to the gas circuit of the electrical equipment through the multi-way connector.

25. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 24, characterized in that: It also includes an air supply interface, which is arranged on the air path isolation pressure regulating mechanism body; or, the air supply interface is arranged on the multi-way connector.

26. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 24, characterized in that: It also includes a valve, and the air path isolation pressure regulating mechanism body is also provided with a third interface, one end of the valve is connected to the third interface, and the other end of the valve is connected to the electrical equipment through the multi-way connector; the first interface is located between the second interface and the third interface.

27. The gas path isolation pressure regulating mechanism for online calibration of a density relay according to claim 26, characterized in that: It also includes a self-sealing valve, which is installed between the multi-way connector and the valve; or the valve is installed between the multi-way connector and the self-sealing valve.

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