Gas density relay verification device and method

Abstract

The invention discloses a gas density relay verification device and method. The device comprises a communication joint, a pressure adjusting mechanism, a signal acquisition unit, a control unit and a data output unit, wherein the communication joint is used for communicating with the gas density relay. The pressure adjusting mechanism is used for adjusting the pressure of the insulating gas in the communication connector. And the signal acquisition unit is used for acquiring a temperature signal and a pressure signal of the insulating gas in the communication joint, and acquiring a contact signal and a remote transmission signal of the gas density relay. The control unit is used for acquiring a remote transmission signal, a temperature signal and a pressure signal corresponding to the contact signal, and acquiring a gas density detection value according to the temperature signal, the pressure signal and a pressure-temperature characteristic relationship of the insulating gas; and a verification conclusion of the gas density relay is given by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value. And the data output unit is used for outputting a verification conclusion of the gas density relay. According to the invention, verification of the gas density relay is realized.

Description

Technical Field

[0001] This invention relates to the field of power equipment operation and maintenance, and in particular to a gas density relay calibration device and method. Background Technology

[0002] SF6 gas density relays are a key component of SF6 electrical switches. They are used to detect changes in the density of SF6 gas within the SF6 electrical equipment, and their performance directly affects the reliable and safe operation of the equipment. According to Article 7.5 of the National Metrological Verification Regulation JJG1073-2011 "Pressure-type SF6 Gas Density Controller," the verification cycle should not exceed one year. Furthermore, the power industry standard DL / T259-2012 "Verification Procedure for Sulfur Hexafluoride Gas Density Relays" stipulates that gas density relays should be periodically verified on-site. From practical operation, periodic verification of SF6 gas density relays on-site is a necessary means to prevent potential problems and ensure the safe and reliable operation of power equipment. In recent years, with the rapid development of smart grids, digital gas density relays have been widely used. However, there is currently a lack of equipment and methods for verifying digital gas density relays, making on-site verification difficult and inconvenient. Summary of the Invention

[0003] This invention provides a gas density relay calibration device and method, which can realize the calibration of gas density relays.

[0004] This invention provides a gas density relay calibration device, including a connecting connector, a pressure regulating mechanism, a signal acquisition unit, a control unit, and a data output unit. The connecting connector is used to connect with the gas density relay. The pressure regulating mechanism is used to regulate the pressure of the insulating gas within the connecting connector. The signal acquisition unit is used to acquire the temperature and pressure signals of the insulating gas within the connecting connector, as well as the contact signals and remote transmission signals of the gas density relay. The control unit is connected to the signal acquisition unit and is used to acquire the remote transmission signal, temperature signal, and pressure signal corresponding to the contact signals. Based on the temperature and pressure signals and the pressure-temperature characteristic relationship of the insulating gas, the control unit obtains the gas density detection value and, by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value, provides a calibration conclusion for the gas density relay. The data output unit is connected to the control unit and is used to output the calibration conclusion for the gas density relay.

[0005] In some embodiments, the connecting joint has a first connecting interface. The gas density relay calibration device also includes a calibration assembly joint. The calibration assembly joint has a first assembly interface, a second assembly interface, and a third assembly interface, wherein the first assembly interface is connected to the first connecting interface, the second assembly interface is used for connection to electrical equipment, and the third assembly interface is used for connection to the gas density relay.

[0006] In some embodiments, the connector has a second communication interface. The gas density relay calibration device also includes a calibration tube. A first end of the calibration tube is connected to the second communication interface, and a second end is used to connect to the communication air path of the electrical equipment and the gas density relay.

[0007] In some embodiments, the communication interface has a third communication interface. The pressure regulating mechanism includes a pressure regulating cylinder and a driving member. The pressure regulating cylinder is disposed below the communication interface and includes a cylinder body and a piston structure. One end of the cylinder body has an opening that communicates with the third communication interface. The piston structure is slidably sealed to the inner peripheral wall of the cylinder body. The driving member is connected to the piston structure and is used to drive the piston structure to slide.

[0008] In some embodiments, the gas density relay calibration device further includes a vacuum pump and a first valve. The vacuum pump's vacuum port is connected to a connecting gas path via a first gas path and an opening and a third connecting interface; the vacuum pump is used for evacuation. The first valve is installed on the first gas path and is used to control the opening and closing of the first gas path.

[0009] In some embodiments, the gas density relay calibration device further includes a gas storage tank and a second valve. The gas source interface of the gas storage tank is connected to a connecting gas path via a second gas path and an opening and a third connecting interface. The gas storage tank is used to store insulating gas. The second valve is installed on the second gas path and is used to control the on / off state of the second gas path.

[0010] In some embodiments, the connector has a fourth communication interface. Both the temperature sensor and the pressure sensor are mounted at the fourth communication interface.

[0011] In some embodiments, the connecting joint has a fifth connecting interface. The gas density relay calibration device also includes a safety valve installed at the fifth connecting interface.

[0012] In some embodiments, the gas density relay calibration device further includes a frame and a housing. The housing is mounted on the frame and contains a connecting connector, a pressure regulating mechanism, a temperature sensor, a pressure sensor, a vacuuming mechanism, a gas replenishment mechanism, and a control unit. The housing also includes a contact signal sampling unit, a remote signal sampling unit, and a data output unit. The housing has openings for the gas path of the connecting connector and the gas density relay to pass through.

[0013] This invention provides a method for calibrating a gas density relay, comprising the following steps: adjusting the pressure of the insulating gas introduced into the gas density relay to cause the gas density relay to emit a contact signal; acquiring the remote transmission signal of the gas density relay corresponding to the contact signal, as well as the temperature and pressure signals of the insulating gas; obtaining a gas density detection value based on the temperature signal, pressure signal, and the pressure-temperature characteristic relationship of the insulating gas; and drawing a calibration conclusion for the gas density relay by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value.

[0014] A gas density relay calibration device according to an embodiment of the present invention includes a connecting connector, a pressure regulating mechanism, a signal acquisition unit, a control unit, and a data output unit. The connecting connector is used to connect with the gas density relay. The pressure regulating mechanism is used to regulate the pressure of the insulating gas within the connecting connector. The signal acquisition unit is used to acquire the temperature and pressure signals of the insulating gas within the connecting connector, as well as the contact signals and remote transmission signals of the gas density relay. The control unit is connected to the signal acquisition unit and is used to acquire the remote transmission signal, temperature signal, and pressure signal corresponding to the contact signals. Based on the temperature and pressure signals and the pressure-temperature characteristic relationship of the insulating gas, the control unit obtains the gas density detection value and, by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value, gives the calibration conclusion of the gas density relay. The data output unit is connected to the control unit and is used to output the calibration conclusion of the gas density relay. The gas density relay calibration device of the present invention, by setting up a connecting connector, a pressure regulating mechanism, a signal acquisition unit, a control unit, and a data output unit, realizes the calibration of the gas density relay by adjusting the pressure of the insulating gas in the connecting connector after connecting the connecting connector to the gas density relay and disconnecting the gas path between the gas density relay and the electrical equipment, thereby causing the gas density relay to send a contact signal. Then, it acquires the remote transmission signal of the gas density relay corresponding to the contact signal, as well as the temperature and pressure signals of the insulating gas in the connecting connector. Next, it obtains the gas density detection value based on the temperature signal, pressure signal, and pressure-temperature characteristic relationship of the insulating gas, and derives the calibration conclusion of the gas density relay by comparing the gas density value corresponding to the remote transmission signal and the gas density detection value. Finally, it outputs the calibration conclusion of the gas density relay, thereby realizing the calibration of the gas density relay. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a side view of the gas density relay calibration device in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the working principle of the gas density relay calibration device in this embodiment of the invention. Figure 3 This is a front view of the gas density relay calibration device in an embodiment of the present invention; Figure 4 This is a schematic diagram of the vehicle frame structure in an embodiment of the present invention; Figure 5 This is an external schematic diagram of the gas density relay calibration device in an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the pressure regulating cylinder in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention when it increases the pressure inside the connecting joint; Figure 9 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention when it reduces the pressure inside the connecting joint; Figure 10 This is a schematic diagram of the electrical connections of the gas density relay calibration device in an embodiment of the present invention; In the diagram, 1-pressure regulating cylinder, 101-sealing upper cover, 102-cylinder body, 103-sealing lower cover, 104-piston, 105-sealing ring, 106-adjusting rod, 2-universal connector, 3-drive component, 301-stepper motor, 302-mounting component, 303-base plate, 304-conduction screw, 305-conduction slider, 306-guide rod, 307-fixed block, 308-fixed guide block, 309-push shaft, 310-wiring cable, 4-connecting connector, 5-pressure sensor, 6-temperature sensor, 7-pressure sensor, 8-temperature sensor, 9-pressure sensor, 100-temperature sensor, 101-sealing upper cover, 102-cylinder body, 103-sealing lower cover, 104-piston, 105-sealing ring, 106-adjusting rod, 2-universal connector, 3-drive component, 301-stepper motor, 302-mounting component, 303-base plate, 304-conduction screw, 305-conduction slider, 306-guide rod, 307-fixed block, 308-fixed guide block, 309-push shaft, 310-wiring cable, 4-connecting connector, 5-pressure sensor, 6-temperature sensor, 7-pressure sensor, 8-temperature sensor, 9-temperature sensor, 100-pressure sensor, 101-sealing upper cover, 102-cylinder body, 103-sealing lower cover, 104-piston, 105-sealing ring, 106-adjusting rod, 107-universal connector, 108-fixed block, 109-drive shaft, 310-wi 8-Control unit, 9-Safety valve, 10-Second solenoid valve, 11-Gas tank, 12-First solenoid valve, 13-Vacuum pump, 14-Data output unit, 15-Connecting air pipe, 16-Verification assembly joint, 17-Verification air pipe, 18-Contact signal sampling unit, 19-Remote signal sampling unit, 20-Box, 21-Verification table, 22-Toolbox, 23-Support frame, 24-Handrail, 25-Main structural frame, 26-Crossbeam, 27-Wheels, 28-Assemblies, 29-Gas density relay, 20-Electrical equipment. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] A digital gas density relay is a device used to monitor the gas density inside gas-insulated electrical equipment. To ensure the accuracy of its monitoring results, the gas density relay needs to be calibrated periodically. For the above information, please refer to... Figure 1-10 This invention provides a gas density relay calibration device. The gas density relay 28 is a digital gas density relay, which can be an absolute pressure relay, a relative pressure relay, a relative mixed pressure relay, or an absolute mixed pressure relay. The gas density relay calibration device includes a connecting connector 4, a pressure regulating mechanism, a signal acquisition unit, a control unit 7, and a data output unit 13.

[0019] Connector 4 is used to connect to gas density relay 28. Connector 4 may have a first connecting interface, a second connecting interface, a third connecting interface, a fourth connecting interface, and a fifth connecting interface. Under the above conditions, the gas density relay calibration device may also include a calibration assembly connector 15. Calibration assembly connector 15 has a first assembly interface, a second assembly interface, and a third assembly interface. The first assembly interface is connected to the first connecting interface. The second assembly interface is used to connect to electrical equipment 29. The third assembly interface is used to connect to gas density relay 28. The above configuration allows calibration assembly connector 15 to be used for gas density relay 28 to be calibrated with various interface sizes and orientations in the field and laboratory. The gas density relay calibration device may also include a calibration gas pipe 16. The first end of calibration gas pipe 16 is connected to the second connecting interface, and the second end is used to connect to the connecting gas path of electrical equipment 29 and gas density relay 28. The gas density relay calibration device may also include a safety valve 8. Safety valve 8 is installed at the fifth connecting interface. The above configuration allows calibration gas pipe 16 to be used to connect the gas path of gas density relay 28 to be calibrated in the field without disassembly of electrical equipment 29.

[0020] The pressure regulating mechanism is used to regulate the pressure of the insulating gas inside the connecting joint 4. The pressure regulating mechanism may include a pressure regulating cylinder 1 and a driving component 3.

[0021] The pressure regulating cylinder 1 is located below the connecting joint 4. The pressure regulating cylinder 1 includes a cylinder body 102 and a piston structure. One end of the cylinder body 102 has an opening that communicates with the third connecting interface. The cylinder body 102 can be vertically oriented. The piston structure is slidably sealed to the inner circumferential wall of the cylinder body 102. Specifically, the piston structure includes a piston 104 and an adjusting rod 106. The piston 104 is slidably disposed within the cylinder body 102 and in sealing contact with the inner circumferential wall of the cylinder body 102. The adjusting rod 106 slidably passes through the other end of the cylinder body 102 and is connected to the piston 104. The pressure regulating cylinder 1 may also include a sealing upper cover 101 and a sealing lower cover 103. The sealing upper cover 101 seals the upper end of the cylinder body 102. The sealing lower cover 103 seals the lower end of the cylinder body 102. Under these conditions, the opening can be located on the sealing upper cover 101, and the adjusting rod 106 can pass through the sealing lower cover 103. The pressure regulating cylinder 1 may also include a sealing ring 105. There are two sealing rings 105, both of which are mounted on the piston 104 and make sealing contact with the inner peripheral wall of the cylinder body 102.

[0022] The driving component 3 is connected to the piston structure and is used to drive the piston structure to slide. Specifically, the driving component 3 includes a motor 301, a lead screw 304, and a sliding block 305. The output shaft of the motor 301 is parallel to the center line of the cylinder 102. The motor 301 can rotate forward and backward. The lead screw 304 is coaxially connected to the output shaft of the motor 301. The sliding block 305 is threaded onto the lead screw 304 and connected to the adjusting rod 106. The driving component 3 may also include a push shaft 309. The push shaft 309 is connected to the sliding block 305 and connected to the adjusting rod 106 via a universal connector 2. The driving component 3 may also include a guide rod 306. The guide rod 306 is parallel to the lead screw 304 on the same plane. Under the above conditions, the sliding block 305 slidably passes through the guide rod 306. The push shaft 309 connects to the guide rod 306 and the sliding block 305 between the lead screw 304 and the lead screw 309. The driving component 3 may also include a fixing block 307 and a fixing guide block 308. Under the above conditions, both ends of the guide rod 306 are respectively mounted on the fixing block 307 and the fixing guide block 308. The push shaft 309 is slidably passed through the fixing guide block 308. The driving component 3 may also include a base plate 303, a mounting component 302, and a ribbon cable 310. Under the above conditions, the motor 301 is mounted on the base plate 303 via the mounting component 302. Both the fixing block 307 and the fixing guide block 308 are mounted on the base plate 303. The ribbon cable 310 is connected to the motor 301.

[0023] Under the above conditions, the motor 301 drives the lead screw 304 to rotate, the lead screw 304 drives the lead slider 305 to slide, the lead slider 305 drives the push rod to slide, the push rod drives the adjusting rod 106 to slide via the universal connector 2, the adjusting rod 106 drives the piston 104 to slide, thereby adjusting the pressure in the cylinder 102, and further adjusting the pressure in the connecting joint 4.

[0024] The signal acquisition unit is used to acquire the temperature and pressure signals of the insulating gas inside the connecting joint 4, as well as the contact signals and remote transmission signals of the gas density relay 28. The signal acquisition unit includes a temperature sensor 6, a pressure sensor 5, a contact signal sampling unit 17, and a remote transmission signal sampling unit 18.

[0025] Temperature sensor 6 is used to collect the temperature signal of the insulating gas inside the connecting joint 4. Temperature sensor 6 is installed at the fourth connecting interface.

[0026] Pressure sensor 5 is used to acquire the pressure signal of the insulating gas inside the connecting joint 4. Pressure sensor 5 can be an absolute pressure sensor and / or a relative pressure sensor. Pressure sensor 5 is installed at the fourth connecting joint.

[0027] The temperature sensor 6 and pressure sensor 5 mentioned above can be two independent components, or they can be integrated into one component, such as a gas density transmitter composed of pressure sensor 5 and temperature sensor 6.

[0028] The contact signal sampling unit 17 is used to collect the contact signals of the gas density relay 28, serving as the input terminal for the contact action signals of the gas density relay 28. The contact signals include alarm and / or lockout contact signals. Under the above conditions, the contact signal sampling unit 17 is directly or indirectly connected to the alarm / or lockout contacts of the gas density relay 28.

[0029] The remote signal sampling unit 18 is used to collect the remote signal of the gas density relay 28 and serves as the remote signal input terminal of the gas density relay 28. Under the above conditions, the remote signal sampling unit 18 is directly or indirectly connected to the remote signal output terminal of the gas density relay 28.

[0030] The control unit 7 is connected to the signal acquisition unit. The control unit 7 acquires the remote transmission signal, temperature signal, and pressure signal corresponding to the contact signal. Based on the temperature signal, pressure signal, and the pressure-temperature characteristic relationship of the insulating gas, it obtains the gas density detection value (i.e., the corresponding pressure value at 20℃). By comparing the gas density value corresponding to the remote transmission signal (including contact action value and contact return value) with the gas density detection value, it provides a verification conclusion for the gas density relay 28. Specifically, the control unit 7 is connected to the contact signal sampling unit 17, the remote transmission signal sampling unit 18, the temperature sensor 6, and the pressure sensor 5. Under the above conditions, the control unit 7 can determine whether the difference between the gas density value and the gas density detection value meets the relevant technical specifications, thereby determining whether the gas density relay 28 is qualified and issuing a data report with a verification conclusion for the gas density relay 28. It can also simultaneously verify the contact action value and the remote transmission signal monitoring value (i.e., the contact return value) of the gas density relay 28. The control unit 7 can be a microcontroller unit (MUC). The control unit 7 can also be connected to the vacuum pump 12, the first solenoid valve 11, the second solenoid valve 9, the motor 301, and the safety valve 8 to realize intelligent control of the above-mentioned devices.

[0031] The data output unit 13 is connected to the control unit 7 and is used to output the verification results of the gas density relay 28. The data output unit 13 is mainly composed of an LCD or digital tube. The data output unit 13 can display, on-site, including but not limited to, gas density values, temperature values, return values, pressure values, verification conclusions, and working status indicators.

[0032] The gas density relay calibration device may also include a vacuuming mechanism and a gas replenishment mechanism.

[0033] A vacuuming mechanism is used to evacuate the connecting joint 4. The vacuuming mechanism may include a vacuum pump 12 and a first valve. The vacuum port of the vacuum pump 12 is connected to the connecting gas path of the opening and the third connecting interface via a first gas path, and the vacuum pump 12 is used for evacuation. The first valve is installed on the first gas path and is used to control the opening and closing of the first gas path. The first valve may be a first electrically controlled valve 11.

[0034] The gas replenishment mechanism is used to replenish insulating gas into the connecting joint 4. The gas replenishment mechanism may include a gas storage tank 10 and a second valve. The gas source interface of the gas storage tank 10 is connected to the connecting gas path of the opening and the third connecting interface via a second gas path. The gas storage tank 10 is used to store insulating gas. The insulating gas is qualified SF6 gas, meeting the field usage requirements of the gas density relay 28. The second valve is installed on the second gas path and is used to control the on / off state of the second gas path. The second valve can be a second electrically controlled valve 9.

[0035] The gas density relay calibration device may also include a frame, a housing 19, a calibration table 20, and a toolbox 21.

[0036] The frame may include a main structural frame 24, crossbeams 25, handrails 23, and wheels 26. There are two main structural frames 24, both vertically arranged columnar structures. There are also two crossbeams 25, both horizontally arranged columnar structures. The two crossbeams 25 and the two main structural frames 24 are installed together to form a well-like structure. The handrails 23 are installed at the upper ends of the two main structural frames 24. There are two wheels 26, each installed at the lower end of one of the two main structural frames 24. The frame may also include mounting accessories 27. There may be multiple accessories 27, such as eight, each accessory 27 is located at the mounting points of the main structural frames 24 and crossbeams 25, and is installed and secured with bolts. The wheels 26 can be accessible wheels. This configuration makes the device easy to carry and move, with a simple structure, small size, light weight, and suitable for on-site calibration of gas density relays 28.

[0037] The housing 19 is mounted on the vehicle frame. Inside the housing 19 are a connecting connector 4, a pressure regulating mechanism, a temperature sensor 6, a pressure sensor 5, a vacuuming mechanism, a gas replenishment mechanism, and a control unit 7. The housing 19 also includes a contact signal sampling unit 17, a remote signal sampling unit 18, and a data output unit 13. The housing 19 has openings for the gas path connecting the connecting connector 4 and the gas density relay 28 to pass through. The housing 19 can be mounted on two main structural frames 24.

[0038] The calibration table 20 is mounted on the frame and positioned above the housing 19. The calibration table has a mounting section for mounting the calibration assembly connector 15 or other auxiliary components. The calibration table 20 can be mounted on two main structural frames 24. The mounting section can have multiple threaded holes. These threaded holes are distributed in an array, not limited to a circular or square pattern. Different calibration assembly connectors 15 can be replaced according to different needs.

[0039] Toolbox 21 is mounted on the frame and positioned below the housing 19. Toolbox 21 can be mounted on either of the two main structural frames 24. Toolbox 21 can be either a drawer or a cabinet. This configuration facilitates the storage and organization of various tools. A support frame 22 is installed at the bottom of toolbox 21.

[0040] An embodiment of the present invention provides a method for calibrating a gas density relay. The gas density relay calibration method can employ the aforementioned gas density relay calibration device. The gas density relay calibration method includes the following steps: Adjust the pressure of the insulating gas supplied to the gas density relay 28 so that the gas density relay 28 sends a contact signal; acquire the remote transmission signal of the gas density relay corresponding to the contact signal, as well as the temperature and pressure signals of the insulating gas; obtain the gas density detection value based on the temperature signal, pressure signal, and the pressure-temperature characteristic relationship of the insulating gas; and draw the verification conclusion of the gas density relay 28 by comparing the gas density value corresponding to the remote transmission signal and the gas density detection value.

[0041] In the above steps, the connecting joint 4 is connected to the gas density relay 28; the gas connection between the electrical equipment 29 and the gas density relay 28 is disconnected; the connecting joint 4 is evacuated; insulating gas is added to the connecting joint 4; and the pressure inside the connecting joint 4 is adjusted to regulate the pressure of the insulating gas supplied to the gas density relay 28. Specifically, the gas density relay 28 and the electrical equipment 29 are connected to the calibration assembly joint 15, or the gas connection between the electrical equipment 29 and the gas density relay 28 is connected to the calibration gas pipe 16, thus connecting the connecting joint 4 to the gas density relay 28. The control unit 7 evacuates the connecting joint 4 by opening the first valve, closing the second valve, and then starting the vacuum pump 12. The control unit 7 adds insulating gas to the connecting joint 4 by closing the vacuum pump 12 and the first valve, opening the second valve, and then closing the second valve. The control unit 7 regulates the pressure inside the connecting joint 4 by controlling the motor 301 to drive the piston 104 to slide.

[0042] The control unit 7 acquires alarm and / or interlock contact signals through the contact signal sampling unit 17, and acquires the remote transmission signal of the gas density relay corresponding to the alarm and / or interlock contact signals, as well as the temperature and pressure signals of the insulating gas, through the remote transmission signal sampling unit 18, temperature sensor 6, and pressure sensor 5. The control unit 7 obtains the gas density detection value based on the temperature signal, pressure signal, and the pressure-temperature characteristic relationship of the insulating gas, and provides a verification conclusion for the gas density relay 28 by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value.

[0043] The pressure-temperature characteristics of the insulating gas are pre-stored in the gas density relay calibration device. Specifically, the local ambient atmospheric pressure is stored in the gas density relay calibration device through testing or manual input.

[0044] The gas density relay calibration device of the present invention, by setting up a connecting connector 4, a pressure regulating mechanism, a signal acquisition unit, a control unit 7, and a data output unit 13, realizes that after connecting the connecting connector 4 to the gas density relay 28 and disconnecting the gas path connecting the gas density relay 28 to the electrical equipment 29, by adjusting the pressure of the insulating gas in the connecting connector 4, the gas density relay 28 sends a contact signal. Then, it acquires the remote transmission signal of the gas density relay 28 corresponding to the contact signal, as well as the temperature signal and pressure signal of the insulating gas in the connecting connector 4. Next, it obtains the gas density detection value according to the temperature signal, pressure signal, and pressure-temperature characteristic relationship of the insulating gas. Then, it obtains the calibration conclusion of the gas density relay 28 by comparing the gas density value corresponding to the remote transmission signal and the gas density detection value, and finally outputs the calibration conclusion of the gas density relay, thereby realizing the calibration of the gas density relay 28.

[0045] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas density relay calibration device, characterized in that, include: A connecting connector for connecting to a gas density relay; A pressure regulating mechanism is used to regulate the pressure of the insulating gas inside the connecting joint; The signal acquisition unit is used to acquire the temperature and pressure signals of the insulating gas inside the connecting joint, as well as the contact signals and remote transmission signals of the gas density relay. A control unit is connected to the signal acquisition unit. The control unit is used to acquire the remote transmission signal, the temperature signal, and the pressure signal corresponding to the contact signal. It acquires the gas density detection value based on the temperature signal, the pressure signal, and the pressure-temperature characteristic relationship of the insulating gas. It gives the verification conclusion of the gas density relay by comparing the gas density value corresponding to the remote transmission signal and the gas density detection value. A data output unit is connected to the control unit, and the data output unit is used to output the verification result of the gas density relay.

2. The gas density relay calibration device as described in claim 1, characterized in that, The connecting joint has a first connecting interface; the gas density relay calibration device further includes: The calibration assembly connector has a first assembly interface, a second assembly interface, and a third assembly interface. The first assembly interface is connected to a first communication interface, the second assembly interface is used to connect to electrical equipment, and the third assembly interface is used to connect to the gas density relay.

3. The gas density relay calibration device as described in claim 1, characterized in that, The connecting joint has a second connecting interface; the gas density relay calibration device further includes: The calibration tube has a first end connected to the second communication interface, and a second end used to connect to the communication air path of the electrical equipment and the gas density relay.

4. The gas density relay calibration device as described in claim 1, characterized in that, The communication interface has a third communication interface; the pressure regulating mechanism includes: A pressure regulating cylinder is disposed below the connecting joint. The pressure regulating cylinder includes a cylinder body and a piston structure. One end of the cylinder body is provided with an opening, which communicates with the third connecting interface. The piston structure is slidably sealed to the inner peripheral wall of the cylinder body. A driving element is connected to the piston structure, and the driving element is used to drive the piston structure to slide.

5. The gas density relay calibration device as described in claim 4, characterized in that, Also includes: A vacuum pump, the vacuum port of which is connected to the connecting air passage of the opening and the third connecting interface via the first air passage, the vacuum pump being used for evacuating a vacuum; A first valve is installed in the first gas path, and the first valve is used to control the opening and closing of the first gas path.

6. The gas density relay calibration device as described in claim 4, characterized in that, Also includes: The gas storage tank has a gas source interface connected to the connecting gas passage of the opening and the third connecting interface via a second gas passage. The gas storage tank is used to store the insulating gas. The second valve is installed in the second gas line and is used to control the opening and closing of the second gas line.

7. The gas density relay calibration device as described in claim 1, characterized in that, The connecting joint has a fourth connecting interface; both the temperature sensor and the pressure sensor are installed at the fourth connecting interface.

8. The gas density relay calibration device as described in claim 1, characterized in that, The connecting joint has a fifth connecting interface; the gas density relay calibration device also includes a safety valve, which is installed at the fifth connecting interface.

9. The gas density relay calibration device as described in claim 1, characterized in that, Also includes: Frame; The housing is mounted on the vehicle frame. Inside the housing are the connecting connector, the pressure regulating mechanism, the temperature sensor, the pressure sensor, the vacuuming mechanism, the gas replenishment mechanism, and the control unit. The housing is equipped with the contact signal sampling unit, the remote signal sampling unit, and the data output unit. The housing has holes for the gas path of the connecting connector and the gas density relay to pass through.

10. A method for calibrating a gas density relay, characterized in that, Includes the following steps: Adjust the pressure of the insulating gas introduced into the gas density relay so that the gas density relay sends a contact signal; Acquire the remote transmission signal of the gas density relay corresponding to the contact signal, as well as the temperature and pressure signals of the insulating gas; The gas density detection value is obtained based on the temperature signal, the pressure signal, and the pressure-temperature characteristic relationship of the insulating gas; The verification conclusion of the gas density relay is obtained by comparing the gas density value corresponding to the remote transmission signal with the gas density detection value.

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