Partial discharge detection device and method based on multi-physical quantity collaborative perception

Abstract

The application provides a partial discharge detection device based on multi-physical quantity collaborative sensing, belongs to the technical field of electrical engineering, and comprises a detection device shell, a sealing column, an ultrasonic sensing module, an ultrahigh frequency sensing module, a filtering and amplifying module, a light source module, a photoelectric conversion module and a gas insulated equipment. The bottom of the detection device shell is integrally formed with the sealing column. The bottom of the sealing column is electrically connected with the ultrasonic sensing module. The bottom of the ultrasonic sensing module is electrically connected with the ultrahigh frequency sensing module. The upper surface of the detection device shell is electrically connected with the filtering and amplifying module, the light source module and the photoelectric conversion module. The application avoids the complicated processes such as power failure, gas recovery, vacuum extraction, gas filling, standing and leakage detection that must be experienced in the traditional installation mode, shortens the original maintenance time of several hours or even several days to several minutes, greatly improves the power supply reliability, and reduces the operation and maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering technology, and in particular to a partial discharge detection device and method based on the collaborative sensing of multiple physical quantities. Background Technology

[0002] Gas-insulated equipment (such as GIS) is widely used in power systems due to its compact structure, reliable operation, and low maintenance. This type of equipment is filled with high-voltage SF6 insulating gas to ensure electrical insulation between high-voltage live parts and the casing. However, due to manufacturing processes or long-term operation, defects such as burrs on the conductor tips and air gaps in the insulating material may appear inside the equipment. These defects can cause partial discharge under the influence of a high-voltage electric field. If partial discharge is not detected in time, it will lead to gradual and accelerated insulation deterioration, potentially causing serious power accidents and threatening the safe and stable operation of the power system. For the detection of partial discharge in gas-insulated equipment, existing technologies already include detection solutions. For example, Chinese invention patent CN115436762A discloses a multi-physical joint monitoring device and method for partial discharge. This device includes an integrated acoustic-electric sensor, a time-series signal storage module, a time-series-to-spectrum conversion module, and a spectrum display module. The integrated acoustic-electric sensor integrates an ultra-high frequency sensing module and an ultrasonic sensing module, enabling simultaneous acquisition of partial discharge ultrasonic signals and ultra-high frequency signals from inside the gas-insulated equipment, thus achieving joint monitoring of multiple physical information. The installation or removal of this device requires a power outage and gas recovery. Specifically, the acoustic-electric integrated sensor in this prior art document is fixed to a pre-set handhole on the gas-insulated equipment housing via a flange or threaded connection. The sensor's front end (including the UHF sensing module and the ultrasonic sensing module) extends into the equipment to directly collect partial discharge signals. Because the equipment is filled with high-voltage SF6 insulating gas and the sensor's front end is directly connected to the internal environment, when it is necessary to install, remove, or replace the sensor (e.g., when the sensor malfunctions, requires periodic calibration, or is undergoing a technical upgrade), the gas recovery process must be completed first. The gas-insulated equipment in this section is de-energized, and then the SF6 gas inside the equipment is recovered. The equipment is then evacuated to reduce the internal pressure to normal or negative pressure before the sensor can be safely installed or removed. After the sensor is installed or replaced, it is necessary to refill it with SF6 gas, let it stand, and check for leaks to ensure sealing. The above process usually takes several hours or even days, resulting in prolonged power outages, which seriously affect the reliability of power supply and increase maintenance costs. Therefore, there is an urgent need to design a partial discharge detection device based on multi-physical quantity collaborative sensing to solve the problems existing in the above-mentioned technologies. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the above-mentioned background technology, and to propose a partial discharge detection device based on the collaborative sensing of multiple physical quantities.

[0004] The technical problem to be solved by the present invention is to provide a partial discharge detection device based on multi-physical quantity collaborative sensing to solve the problems of existing partial discharge detection devices based on multi-physical quantity collaborative sensing.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A partial discharge detection device based on multi-physical quantity collaborative sensing includes a detection device housing, a sealing column, an ultrasonic sensing module, an ultra-high frequency sensing module, a filtering and amplification module, a light source module, a photoelectric conversion module, and a gas insulation device. The bottom of the detection device housing is integrally formed with a sealing column, the bottom of which is electrically connected to the ultrasonic sensing module. The bottom of the ultrasonic sensing module is electrically connected to the ultra-high frequency sensing module. The upper surface of the detection device housing is electrically connected to the filtering and amplification module, the light source module, and the photoelectric conversion module. A connecting sleeve is provided through the upper surface of the gas insulation device, and a sealing component is provided at the bottom of the connecting sleeve. The sealing column is inserted into the connecting sleeve, and when the sealing column is inserted, it pushes the sealing component to release the seal.

[0006] Preferably, the sealing assembly includes a guide rod, a fixed plate, a guide sleeve, a sealing plate, and a connecting spring. Guide rods are fixedly provided on both the left and right sides of the bottom surface of the connecting sleeve. A fixed plate is fixedly provided at the bottom of the guide rod. A guide sleeve is sleeved on the guide rod. A sealing plate is fixedly provided between the two guide sleeves. A connecting spring is fixedly provided between the guide sleeve and the fixed plate.

[0007] Preferably, the upper surface of the sealing plate is provided with a raised disc that matches the central through hole of the connecting sleeve.

[0008] Preferably, when the sleeve spring is in its naturally extended state, the upper surface of the sealing plate is attached to the bottom surface of the connecting sleeve, and the protruding disc on the sealing plate is embedded in the connecting sleeve.

[0009] Preferably, the sealing column includes a vertical rod, a sealing sleeve, a horizontal plate, and a locking bolt. The vertical rod is fixedly provided on both the left and right sides of the bottom surface of the sealing column. The sealing sleeve is integrally formed on the top of the outer surface of the sealing column. The horizontal plate is fixedly provided on both the left and right sides of the bottom of the sealing sleeve. The locking bolt is threadedly connected to the horizontal plate.

[0010] Preferably, the bottom horizontal height of the vertical rod is not lower than the bottom horizontal height of the ultra-high frequency sensing module.

[0011] Preferably, when the sealing post is inserted into the connecting sleeve, it forms an airtight connection with the inside of the connecting sleeve.

[0012] Preferably, the inner diameter of the sealing sleeve matches the outer diameter of the connecting sleeve, and when the sealing sleeve is fully fitted onto the connecting sleeve, the bottom horizontal height of the sealing column is not lower than the bottom horizontal height of the connecting sleeve.

[0013] Preferably, the upper surface of the gas insulation device has bolt holes on both the left and right sides that match the locking bolts, and the two locking bolts are threaded onto the bolt holes respectively. A sealing ring is fixedly provided on the top inner side of the sealing sleeve, and when the sealing sleeve is fitted onto the top of the connecting sleeve, the bottom surface of the sealing ring is in close contact with the bottom surface of the connecting sleeve.

[0014] Preferably, it also includes the following steps; S1; When the gas-insulating device 8 is tested by the housing 1 of the testing device, the sealing column 2 is inserted into the connecting sleeve 9, the vertical rod 201 at the bottom of the sealing column 2 abuts against the sealing plate 11, and drives the sealing plate 11 to move downward, so that the sealing plate 11 releases the seal on the bottom of the connecting sleeve 9, the sleeve spring 12 is in a compressed state, and the airtight connection between the sealing column 2 and the connecting sleeve 9 is used to prevent the leakage of SF6 insulating gas inside the gas-insulating device 8. S2; After the sealing column 2 is fully inserted into the connecting sleeve 9, the ultrasonic sensing module 3 and the ultra-high frequency sensing module 4 at the bottom of the sealing column 2 extend into the gas insulation device 8, which facilitates the discharge detection of the gas insulation device 8. S3; The locking bolt 204 locks the sealing column 2 into the bolt hole 801 on the gas-insulated device 8, realizing the installation and fixation of the detection device. When the sealing column 2 is pulled out, the elastic force of the sleeve spring 12 causes the sealing plate 11 to automatically reset and close, restoring the airtightness of the device. During the entire installation or disassembly process, there is no need to shut down the gas-insulated device, nor is there a need to recover or refill SF6 gas, avoiding the cumbersome process of power outage, gas recovery, vacuuming, gas filling, standing, and leak detection that must be experienced in the traditional installation method.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting a sealing column, a connecting sleeve, and a sealing assembly, when the gas-insulating equipment is tested by the detection device housing, the sealing column is inserted into the connecting sleeve. The vertical rod at the bottom of the sealing column abuts against the sealing plate, causing the sealing plate to move downwards. This releases the seal on the bottom of the connecting sleeve, compressing the spring. The airtight connection between the sealing column and the connecting sleeve prevents the leakage of SF6 insulating gas inside the gas-insulating equipment. After the sealing column is fully inserted into the connecting sleeve, the ultrasonic sensing module and the ultra-high frequency sensing module at the bottom of the sealing column extend into the gas-insulating equipment, facilitating testing of the gas-insulating equipment. The process involves discharge detection, followed by locking the sealing column onto the bolt holes of the gas-insulated equipment using locking bolts. This allows for the installation and fixation of the detection device. When the sealing column is pulled out, the spring force of the sleeve causes the sealing plate to automatically reset and close, restoring the airtightness of the equipment. The entire installation or disassembly process does not require power outages to the gas-insulated equipment, nor does it require the recovery or refilling of SF6 gas. This avoids the cumbersome procedures of power outages, gas recovery, vacuuming, refilling, settling, and leak detection that are necessary in traditional installation methods. It reduces maintenance time from several hours or even days to several minutes, significantly improving power supply reliability and reducing operation and maintenance costs.

[0016] In the above scheme, by setting a sealing sleeve and a sealing ring, after the sealing column is inserted into the connecting sleeve, the sealing sleeve is fitted onto the connecting sleeve, and the sealing ring is attached to the top of the connecting sleeve. A primary seal is formed between the sealing column and the connecting sleeve, and the sealing ring provides a secondary seal at the connection between the sealing sleeve and the top of the connecting sleeve. The double sealing structure effectively prevents SF6 gas leakage. Attached Figure Description

[0017] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the three-dimensional structure of the present invention. Figure 3 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 4 This is a schematic diagram showing the cross-sectional structure of the present invention. Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0019] [Figure Labels] 1. Detection device housing; 2. Sealing column; 201. Vertical rod; 202. Sealing sleeve; 203. Horizontal plate; 204. Locking bolt; 205. Sealing ring; 3. Ultrasonic sensing module; 4. UHF sensing module; 5. Filtering and amplification module; 6. Light source module; 7. Photoelectric conversion module; 8. Gas insulation equipment; 801. Bolt hole; 9. Connecting sleeve; 10. Guide rod; 1001. Fixing plate; 11. Sealing plate; 1101. Guide sleeve; 12. Sleeve spring.

[0020] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, they should not be construed as limitations on this invention.

[0023] like Figures 1-5As shown, an embodiment of the present invention provides a partial discharge detection device based on multi-physical quantity collaborative sensing, including a detection device housing 1, a sealing column 2, an ultrasonic sensing module 3, an ultra-high frequency sensing module 4, a filtering and amplification module 5, a light source module 6, a photoelectric conversion module 7, and a gas insulation device 8. The bottom of the detection device housing 1 is integrally formed with a sealing column 2, and the bottom of the sealing column 2 is electrically connected to the ultrasonic sensing module 3. The bottom of the ultrasonic sensing module 3 is electrically connected to the ultra-high frequency sensing module 4. The upper surface of the detection device housing 1 is electrically connected to the filtering and amplification module 5, the light source module 6, and the photoelectric conversion module 7. The upper surface of the gas insulation device 8 is provided with a connecting sleeve 9, and the bottom of the connecting sleeve 9 is provided with a sealing component. The sealing column 2 is inserted into the connecting sleeve 9, and when the sealing column 2 is inserted, it pushes the sealing component to release the seal.

[0024] In this embodiment, the sealing assembly includes a guide rod 10, a fixed plate 1001, a guide sleeve 1101, a sealing plate 11, and a connecting spring 12. Guide rods 10 are fixedly arranged on both the left and right sides of the bottom surface of the connecting sleeve 9. A fixed plate 1001 is fixedly arranged at the bottom of the guide rod 10. A guide sleeve 1101 is sleeved on the guide rod 10. A sealing plate 11 is fixedly arranged between the two guide sleeves 1101. A connecting spring 12 is fixedly arranged between the guide sleeve 1101 and the fixed plate 1001.

[0025] In this embodiment, a raised disc matching the central through hole of the connecting sleeve 9 is provided on the upper surface of the sealing plate 11.

[0026] In this embodiment, when the sleeve spring 12 is in its naturally extended state, the upper surface of the sealing plate 11 is attached to the bottom surface of the connecting sleeve 9, and the protruding disc on the sealing plate 11 is embedded in the connecting sleeve 9, ensuring the sealing effect of the sealing plate 11 on the bottom of the connecting sleeve 9 when the sleeve spring 12 is in its naturally extended state.

[0027] In this embodiment, the sealing column 2 includes a vertical rod 201, a sealing sleeve 202, a horizontal plate 203, and a locking bolt 204. The vertical rod 201 is fixedly provided on both the left and right sides of the bottom surface of the sealing column 2. The sealing sleeve 202 is integrally formed on the top of the outer surface of the sealing column 2. The horizontal plate 203 is fixedly provided on both the left and right sides of the bottom of the sealing sleeve 202. The locking bolt 204 is threadedly connected to the horizontal plate 203.

[0028] In this embodiment, the bottom horizontal height of the vertical rod 201 is not lower than the bottom horizontal height of the ultra-high frequency sensing module 4, so that the vertical rod 201 can first contact the sealing plate 11, and the vertical rod 201 can move downward to drive the sealing plate 11 to release the seal.

[0029] In this embodiment, when the sealing post 2 is inserted into the connecting sleeve 9, it is in an airtight connection with the inside of the connecting sleeve 9, ensuring the sealing between the sealing post 2 and the inside of the connecting sleeve 9.

[0030] In this embodiment, the inner diameter of the sealing sleeve 202 matches the outer diameter of the connecting sleeve 9, and when the sealing sleeve 202 is fully fitted onto the connecting sleeve 9, the bottom horizontal height of the sealing column 2 is not lower than the bottom horizontal height of the connecting sleeve 9, which facilitates the ultrasonic sensing module 3 and the ultra-high frequency sensing module 4 at the bottom of the sealing column 2 to extend into the gas insulation device 8.

[0031] In this embodiment, bolt holes 801 matching the locking bolts 204 are provided on both the left and right sides of the upper surface of the gas insulation device 8, and the two locking bolts 204 are threaded onto the bolt holes 801 respectively.

[0032] In this embodiment, a sealing ring 205 is fixedly provided on the top inner side of the sealing sleeve 202, and when the sealing sleeve 202 is sleeved on the top of the connecting sleeve 9, the bottom surface of the sealing ring 205 is in close contact with the bottom surface of the connecting sleeve 9, thereby achieving a seal at the connection between the connecting sleeve 9 and the sealing sleeve 202.

[0033] By setting up a sealing column 2, a connecting sleeve 9, and a sealing assembly, when the gas-insulating device 8 is tested by the detection device housing 1, the sealing column 2 is inserted into the connecting sleeve 9. The vertical rod 201 at the bottom of the sealing column 2 abuts against the sealing plate 11, causing the sealing plate 11 to move downwards. This releases the seal on the bottom of the connecting sleeve 9, and the sleeve spring 12 is compressed. The airtight connection between the sealing column 2 and the connecting sleeve 9 prevents the leakage of SF6 insulating gas inside the gas-insulating device 8. After the sealing column 2 is fully inserted into the connecting sleeve 9, the ultrasonic sensing module 3 and the ultra-high frequency sensing module 4 at the bottom of the sealing column 2 extend into the gas-insulating device 8, facilitating the testing of the gas insulation. The device 8 performs discharge detection, and then locks the sealing column 2 onto the bolt hole 801 on the gas-insulated device 8 using the locking bolt 204, thereby installing and fixing the detection device. When the sealing column 2 is pulled out, the elastic force of the sleeve spring 12 causes the sealing plate 11 to automatically reset and close, restoring the airtightness of the device. During the entire installation or disassembly process, there is no need to shut down the gas-insulated device, nor is there a need to recover or refill SF6 gas. This avoids the cumbersome processes of power outage, gas recovery, vacuuming, gas filling, settling, and leak detection that must be experienced in traditional installation methods. The maintenance time that originally took several hours or even days is shortened to several minutes, which greatly improves the reliability of power supply and reduces the operation and maintenance costs.

[0034] With the sealing sleeve 202 and sealing ring 205 provided, after the sealing column 2 is inserted into the connecting sleeve 9, the sealing sleeve 202 is fitted onto the connecting sleeve 9, and the sealing ring 205 is attached to the top of the connecting sleeve 9. A primary seal is formed between the sealing column 2 and the connecting sleeve 9, and the sealing ring 205 provides a secondary seal at the connection between the sealing sleeve 202 and the top of the connecting sleeve 9. The double sealing structure effectively prevents SF6 gas leakage.

[0035] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A partial discharge detection device based on multi-physical quantity collaborative sensing, characterized in that, The device includes a detection device housing (1), a sealing column (2), an ultrasonic sensing module (3), an ultra-high frequency sensing module (4), a filtering and amplification module (5), a light source module (6), a photoelectric conversion module (7), and a gas insulation device (8). The bottom of the detection device housing (1) is integrally formed with a sealing column (2). The bottom of the sealing column (2) is electrically connected to the ultrasonic sensing module (3). The bottom of the ultrasonic sensing module (3) is electrically connected to the ultra-high frequency sensing module (4). The upper surface of the detection device housing (1) is electrically connected to the filtering and amplification module (5), the light source module (6), and the photoelectric conversion module (7). The upper surface of the gas insulation device (8) is provided with a connecting sleeve (9). The bottom of the connecting sleeve (9) is provided with a sealing component. The sealing column (2) is inserted into the connecting sleeve (9), and when the sealing column (2) is inserted, it pushes the sealing component to release the seal.

2. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 1, characterized in that: The sealing assembly includes a guide rod (10), a fixed plate (1001), a guide sleeve (1101), a sealing plate (11), and a connecting spring (12). The bottom surface of the connecting sleeve (9) is fixedly provided with guide rods (10) on both the left and right sides. The bottom of the guide rod (10) is fixedly provided with a fixed plate (1001). The guide sleeve (1101) is sleeved on the guide rod (10). The sealing plate (11) is fixedly provided between the two guide sleeves (1101). The connecting spring (12) is fixedly provided between the guide sleeve (1101) and the fixed plate (1001).

3. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 2, characterized in that: The upper surface of the sealing plate (11) is provided with a raised disc that matches the central through hole of the connecting sleeve (9).

4. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 3, characterized in that: When the sleeve spring (12) is in its natural extended state, the upper surface of the sealing plate (11) is attached to the bottom surface of the connecting sleeve (9), and the protruding disc on the sealing plate (11) is embedded in the connecting sleeve (9).

5. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 4, characterized in that: The sealing column (2) includes a vertical rod (201), a sealing sleeve (202), a horizontal plate (203), and a locking bolt (204). The vertical rod (201) is fixedly installed on both the left and right sides of the bottom surface of the sealing column (2). The sealing sleeve (202) is integrally formed on the top of the outer surface of the sealing column (2). The horizontal plate (203) is fixedly installed on both the left and right sides of the bottom of the sealing sleeve (202). The locking bolt (204) is threaded onto the horizontal plate (203).

6. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 5, characterized in that: The bottom horizontal height of the vertical rod (201) is not lower than the bottom horizontal height of the ultra-high frequency sensing module (4).

7. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 6, characterized in that: When the sealing column (2) is inserted into the connecting sleeve (9), it is airtightly connected to the inside of the connecting sleeve (9).

8. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 7, characterized in that: The inner diameter of the sealing sleeve (202) matches the outer diameter of the connecting sleeve (9), and when the sealing sleeve (202) is fully fitted onto the connecting sleeve (9), the bottom horizontal height of the sealing column (2) is not lower than the bottom horizontal height of the connecting sleeve (9).

9. The partial discharge detection device based on multi-physical quantity collaborative sensing according to claim 8, characterized in that: The gas insulation device (8) has bolt holes (801) on both the left and right sides of its upper surface that match the locking bolts (204), and the two locking bolts (204) are threaded onto the bolt holes (801). A sealing ring (205) is fixedly provided on the top inner side of the sealing sleeve (202), and when the sealing sleeve (202) is fitted onto the top of the connecting sleeve (9), the bottom surface of the sealing ring (205) is in close contact with the bottom surface of the connecting sleeve (9).

10. A manufacturing apparatus for a precast reinforced concrete frame according to claims 1-9, characterized in that, Specifically, it also includes the following steps; S1; When the gas-insulating device 8 is tested by the housing 1 of the testing device, the sealing column 2 is inserted into the connecting sleeve 9, the vertical rod 201 at the bottom of the sealing column 2 abuts against the sealing plate 11, and drives the sealing plate 11 to move downward, so that the sealing plate 11 releases the seal on the bottom of the connecting sleeve 9, the sleeve spring 12 is in a compressed state, and the airtight connection between the sealing column 2 and the connecting sleeve 9 is used to prevent the leakage of SF6 insulating gas inside the gas-insulating device 8. S2; After the sealing column 2 is fully inserted into the connecting sleeve 9, the ultrasonic sensing module 3 and the ultra-high frequency sensing module 4 at the bottom of the sealing column 2 extend into the gas insulation device 8, which facilitates the discharge detection of the gas insulation device 8. S3; The locking bolt 204 locks the sealing column 2 into the bolt hole 801 on the gas-insulated device 8, realizing the installation and fixation of the detection device. When the sealing column 2 is pulled out, the elastic force of the sleeve spring 12 causes the sealing plate 11 to automatically reset and close, restoring the airtightness of the device. During the entire installation or disassembly process, there is no need to shut down the gas-insulated device, nor is there a need to recover or refill SF6 gas, avoiding the cumbersome process of power outage, gas recovery, vacuuming, gas filling, standing, and leak detection that must be experienced in the traditional installation method.

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