Side expansion device, C-GIS equipment and self-separation method thereof

Abstract

A side expansion device disclosed by the present invention comprises a first side expansion sleeve and a second side expansion sleeve, the first side expansion sleeve and the second side expansion sleeve each comprise an insulating sleeve and a conductive seat, the two ends, close to each other, of the two insulating sleeves are respectively connected with a first side splicing flange and a second side splicing flange, and the two ends, away from each other, of the two insulating sleeves are respectively connected with conductive seats in an inserted manner. A bus connector comprising an insulating cylinder and a conductive piece is arranged between the two side splicing flanges, the two ends of the insulating cylinder penetrate through the first side splicing flange and the second side splicing flange respectively to be inserted into the two insulating sleeves, the insulating cylinder is connected with a bus connector grounding wire, and the conductive piece connected with the two conductive seats is inserted into the insulating cylinder. The invention further discloses C-GIS equipment using the side expansion device and a self-separation method of the C-GIS equipment. The invention aims to provide the side expansion device, the C-GIS equipment and the self-separation method of the C-GIS equipment, and aims to solve the problem that adjacent cabinet units need to be moved and disassembled when a middle cabinet unit of the C-GIS equipment is in fault replacement, and realize independent disassembly of the fault cabinet unit and quick replacement of a standby cabinet unit.

Description

Technical Field

[0001] This invention relates to the field of medium-voltage electrical equipment technology, and in particular to a side extension device, a C-GIS device, and a self-separation method thereof. Background Technology

[0002] Because C-GIS equipment has a box-shaped sealed housing, the inflation pressure cannot be too high, and it is mostly used in 12kV-40.5kV products. C-GIS equipment is a series of medium-voltage switchgear products manufactured by placing each high-voltage component in a box-shaped sealed container, filling it with insulating gas at a relatively low pressure, and using modern processing methods.

[0003] In environments such as coastal areas, underground, plateaus, permafrost, dampness, and pollution, switchgear that originally used air as the insulating medium suffers drastic deterioration in insulation performance due to changing environmental conditions, rendering it unsuitable for these applications. Medium-voltage C-GIS equipment was initially developed to address these challenges. C-GIS equipment integrates modern insulation, breaking, manufacturing, connection, sensing, and digital technologies to produce a high-tech product that combines intelligent control, protection, measurement, monitoring, display, and communication functions. It has been widely used in these harsh environments and is the preferred product in urban light rail and subway construction projects.

[0004] C-GIS equipment mostly adopts an independent cabinet unit design, and the side-extension busbar connection between cabinet units has become the industry's preferred method. Its advantages include sealing the busbars of each cabinet unit within an air chamber, isolating them from the outside environment, effectively preventing the influence of external factors such as dirt, condensation, and moisture, and improving insulation reliability. Compared to top-extension busbars, it reduces the installation steps of T-plugs, shielded busbars, stress cones, conductive cones, and insulating plugs in top-extension busbar systems, reducing uneven electric field distribution caused by multiple connections and improving the stability of the busbar system.

[0005] The current C-GIS equipment on the market uses an internal conical sleeve side expansion scheme, which has significant design flaws: Essentially all voltage / current level internal conical sleeves must be installed from the inside out and rigidly fixed to the side plates of the air chamber with bolts. This structure means that when replacing the internal conical sleeve, disassembly can only be completed using tools from outside the cabinet. Even more seriously, when an intermediate cabinet unit malfunctions and needs replacement, a systematic disassembly will be forced. Not only adjacent cabinet units, but all other cabinet unit equipment must be relocated as a whole, and the connected primary cables and overhead conduit connections must also be simultaneously disconnected.

[0006] This design seriously violates the modular maintenance concept, causing non-faulty circuits to be forced to shut down, which greatly affects power supply reliability and operation and maintenance efficiency, and does not meet the requirements of modern smart grids for rapid isolation of equipment faults and minimization of power outage range. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a side expansion device, a C-GIS device and a self-separation method thereof, which aims to solve the problem of moving and disassembling adjacent cabinet units when replacing a faulty intermediate cabinet unit of a C-GIS device, and to realize the independent removal of the faulty cabinet unit and the rapid replacement of the spare cabinet unit.

[0008] The side expansion device of this invention includes a first side expansion sleeve and a second side expansion sleeve. The first side expansion sleeve includes a first insulating sleeve and a first conductive base. The second side expansion sleeve includes a second insulating sleeve and a second conductive base. The first and second insulating sleeves are arranged coaxially opposite to each other. A first side flange arranged coaxially is sealed and fixedly connected to the end of the first insulating sleeve near the second insulating sleeve. A second side flange arranged coaxially is sealed and fixedly connected to the end of the second insulating sleeve near the first insulating sleeve. A first conductive base is sealed and fixedly inserted into the end of the first insulating sleeve away from the second insulating sleeve. A second conductive seat is sealed and fixedly inserted at the end of the second insulating sleeve away from the first insulating sleeve. A bus connector is provided between the two side flanges. The bus connector includes an insulating cylinder and a conductive element. One end of the insulating cylinder passes through the first side flange and is sealed and inserted into the cavity of the first insulating sleeve. The other end of the insulating cylinder passes through the second side flange and is sealed and inserted into the cavity of the second insulating sleeve. A bus connector grounding wire is connected to the outer wall of the insulating cylinder. The bus connector grounding wire is located between the first side flange and the second side flange. A conductive element connecting the first conductive seat and the second conductive seat is inserted into the cavity of the insulating cylinder.

[0009] In the side expansion device of the present invention, the first conductive seat has a first groove at one end located inside the first insulating sleeve, and a first spring contact finger arranged circumferentially on the groove wall of the first groove; the second conductive seat has a second groove at one end located inside the second insulating sleeve, and a second spring contact finger arranged circumferentially on the groove wall of the second groove; the conductive element is a conductive tube, one end of the conductive element is inserted into the first spring contact finger in the first groove and in contact with the first spring contact finger, and the other end of the conductive element is inserted into the second spring contact finger in the second groove and in contact with the second spring contact finger.

[0010] In the side expansion device of the present invention, the first insulating sleeve and the first side flange are fixedly connected by a first bolt, and a first sealing ring is provided between the first insulating sleeve and the first side flange. The second insulating sleeve and the second side flange are fixedly connected by a second bolt, and a second sealing ring is provided between the second insulating sleeve and the second side flange.

[0011] The C-GIS equipment of this invention includes three or more cabinet units connected side-by-side in sequence. Its characteristic is that: two adjacent cabinet units are respectively a first cabinet unit and a second cabinet unit; the air chamber side plate of the first cabinet unit near the second cabinet unit has three first through holes; the air chamber side plate of the second cabinet unit near the first cabinet unit has three second through holes; the three first through holes and the three second through holes are arranged in a one-to-one correspondence; a side expansion device as described in any one of claims 1-3 is connected between the first through holes and the corresponding second through holes; the first side flange is sealed and fixedly connected to the first through hole; both the first side flange and the first side expansion sleeve are located inside the air chamber of the first cabinet unit; and the second side flange is sealed... The second side flange and the second side expansion sleeve are both located in the air chamber of the second cabinet unit. One end of the insulating cylinder passes through the first through hole and the first side flange in sequence and is then sealed and inserted into the cavity of the first insulating sleeve. The other end of the insulating cylinder passes through the second through hole and the second side flange in sequence and is then sealed and inserted into the cavity of the second insulating sleeve. The grounding wire of the bus connector is located between the first cabinet unit and the second cabinet unit. The grounding wire of the bus connector is connected to the outer side wall of the air chamber of the first cabinet unit or the second cabinet unit. The A, B, and C three-phase busbars of the first cabinet unit are respectively connected to three first conductive bases. The A, B, and C three-phase busbars of the second cabinet unit are respectively connected to three second conductive bases.

[0012] In the C-GIS equipment of the present invention, a plurality of first screws are provided on the air chamber side plate at the first through hole of the first cabinet unit. The plurality of first screws are all located in the air chamber of the first cabinet unit. A plurality of first mounting holes are provided on the first side flange. The plurality of first screws are arranged in a one-to-one correspondence with the plurality of first mounting holes. After the first screw passes through the corresponding first mounting hole, it is threadedly connected to the first nut. A first elastic washer is provided between the first nut and the first side flange.

[0013] In the C-GIS equipment of the present invention, a third sealing ring is provided between the first side flange and the air chamber side plate of the first cabinet unit near the second cabinet unit.

[0014] In the C-GIS equipment of the present invention, a plurality of second screws are provided on the air chamber side plate at the second through hole of the second cabinet unit. The plurality of second screws are all located in the air chamber of the second cabinet unit. A plurality of second mounting holes are provided on the second side flange. The plurality of second screws are arranged in a one-to-one correspondence with the plurality of second mounting holes. After the second screw passes through the corresponding second mounting hole, it is threadedly connected to the second nut. A second elastic washer is provided between the second nut and the second side flange.

[0015] In the C-GIS equipment of the present invention, a fourth sealing ring is provided between the second side flange and the air chamber side plate of the second cabinet unit near the first cabinet unit.

[0016] The self-separation method for the C-GIS device described above in this invention includes the following steps: a) Removal of the faulty cabinet unit located in the middle. a1) When a fault occurs in one of the cabinet units located in the middle, the power supply to the line should be cut off and the main busbar should be reliably grounded. If the gas chamber of the faulty cabinet unit is filled with SF6 gas, the gas needs to be recovered first. The faulty cabinet unit is regarded as the first cabinet unit, the normal cabinet unit located to the left of the first cabinet unit is regarded as the second cabinet unit on the left, and the normal cabinet unit located to the right of the first cabinet unit is regarded as the second cabinet unit on the right. a2) Remove the grounding wire of the bus connector between the first cabinet unit and the left and right second cabinet units from the outer wall of the air chamber of the first or second cabinet unit. a3) Remove the inspection panel at the rear of the first cabinet unit. a4) Remove the A-phase busbar from the air chamber of the first cabinet unit. (a5) Remove the first side flange on the left side of phase A of the first cabinet unit from the left side panel of the air chamber of the first cabinet unit. This will remove the entire assembly consisting of the first side flange and the first side expansion sleeve on the left side of phase A from the left side panel of the air chamber of the first cabinet unit. Then, remove the first side flange on the right side of phase A of the first cabinet unit from the right side panel of the air chamber of the first cabinet unit. This will remove the entire assembly consisting of the first side flange and the first side expansion sleeve on the right side of the air chamber of the first cabinet unit. a6) Unplug the busbar connectors on the left and right sides of phase A of the first cabinet unit. a7) Following steps a4)-a6), disconnect the bus connectors on the left and right sides of phase B and phase C in sequence. a8) Sequentially remove all connecting parts between the first cabinet unit and the second cabinet unit on the left and right sides. Push the first cabinet unit forward or backward along the guide rail and remove it from the site. b) Installation of spare cabinet units b1) Push the spare cabinet unit, which has the same structure as the first cabinet unit, into the original position of the first cabinet unit, and remove the maintenance panel at the rear of the spare cabinet unit. b2) Insert the left-side busbar connector of phase A into the first through hole on the left side of the spare cabinet unit, ensuring that the grounding wire of the busbar connector on the left side of phase A is located between the spare cabinet unit and the second cabinet unit on the left. Then, install the first-side flange on the left side of phase A onto the left air chamber side plate of the spare cabinet unit. This completes the installation of the first-side flange on the left side of phase A and the first-side expansion sleeve onto the left air chamber side plate of the spare cabinet unit. Insert the right-side busbar connector of phase A into the first through hole on the right side of the spare cabinet unit, ensuring that the grounding wire of the busbar connector on the right side of phase A is located between the spare cabinet unit and the second cabinet unit on the right. Then, install the first-side flange on the right side of phase A onto the right-side air chamber side plate of the spare cabinet unit. This completes the installation of the first-side flange on the right side of phase A and the first-side expansion sleeve onto the right-side air chamber side plate of the spare cabinet unit. b3) Connect both ends of phase A busbar to the first conductive base of the first side expansion bushing on the left and right sides of phase A respectively, and install phase A busbar. b4) Following steps b2)-b3), install the B-phase busbar and C-phase busbar in sequence. b5) Install the access panel at the rear of the spare cabinet unit. b6) Connect the grounding wire of the bus connector between the spare cabinet unit and the second cabinet unit on the left and the second cabinet unit on the right to the outer wall of the air chamber of the spare cabinet unit or the second cabinet unit. b7) Connect all the connectors between the spare cabinet unit and the second cabinet unit on the left and the second cabinet unit on the right. b8) Evacuate the air chamber of the standby cabinet unit and fill the air chamber of the standby cabinet unit with SF6 gas or other environmentally friendly gas to the specified pressure range. b9) Conduct necessary sealing and insulation tests. Only after passing the tests can the power supply procedure be performed.

[0017] The side expansion device, C-GIS equipment, and self-separation method of this invention differ from existing technologies in that if a cabinet unit in the C-GIS equipment of this invention malfunctions, the inspection plate of the malfunctioning cabinet unit can be disassembled separately. Then, the three-phase busbar located within the malfunctioning cabinet unit is removed, and the side expansion device components on both sides are disassembled. This disconnects the busbar connection between the malfunctioning cabinet unit and the normal cabinet units on both sides. Next, all connections between the malfunctioning cabinet unit and the normal cabinet units on both sides are removed, allowing the malfunctioning cabinet unit to be moved out. Then, a spare cabinet unit is pushed to the original location of the malfunctioning cabinet unit. The inspection plate on the spare cabinet unit is removed, and the side expansion device components on both sides inside the spare cabinet unit are connected. The three-phase busbar is then connected, and the inspection plate is installed on the spare cabinet unit. Finally, all connections between the spare cabinet unit and the normal cabinet units on both sides are connected. This completes the independent removal of the malfunctioning cabinet unit and the rapid replacement of the spare cabinet unit, solving the problem of moving and disassembling adjacent cabinet units when replacing a malfunctioning middle cabinet unit in existing C-GIS equipment.

[0018] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is the main view of the C-GIS device in this invention; Figure 2 This is a right view of the C-GIS device in this invention; Figure 3 This is a rear view of the C-GIS device in this invention; Figure 4 This is a schematic diagram of the inner side structure of the inspection plate at the upper rear of the cabinet unit in this invention; Figure 5 This is a schematic diagram of the sealing ring structure between the inspection plate at the upper rear of the cabinet unit and the cabinet unit in this invention; Figure 6 This is a rear view of the C-GIS equipment after the inspection panel above the rear of the cabinet unit has been removed in this invention. Figure 7 for Figure 6 A magnified view of a section at point A in the middle; Figure 8 This is a schematic diagram of the structure of the cabinet unit air chamber side plate without the side flange and side expansion sleeve installed in this invention; Figure 9 This is a schematic diagram of the structure of the cabinet unit air chamber side plate after the side flange and side expansion sleeve are installed; Figure 10 This is a perspective view of the side-joint flange in this invention; Figure 11This is a schematic diagram of the side flange of the present invention, which is used to abut against the insulating sleeve. Figure 12 For along Figure 11 Sectional view of the middle BB line; Figure 13 This is a schematic diagram of the structure of the side flange in this invention, which is used to abut against the side plate of the air chamber of the cabinet unit; Figure 14 This is a front view of the side expansion sleeve in this invention; Figure 15 This is a front sectional view of the side expansion sleeve in this invention; Figure 16 This is a schematic diagram of the sealing ring structure between the insulating sleeve and the side flange in this invention; Figure 17 This is a schematic diagram of the sealing ring structure between the side flange and the side plate of the air chamber of the cabinet unit in this invention; Figure 18 This is a schematic diagram of the bus connector in this invention.

[0020] Figure reference numerals: 01. Cabinet unit; 02. Air chamber; 03. Inspection plate; 04. Inspection plate sealing ring; 05. Busbar; 06. Air chamber side plate; 07. Insulating cylinder; 08. Conductive component; 09. Busbar connector; 10. Busbar connector grounding wire; 11. First conductive base; 12. First insulating sleeve; 13. First side flange; 14. Second conductive base; 15. Second insulating sleeve; 16. Second side flange; 17. First through hole; 18. Second through hole; 19. First screw; 20. Second screw; 21. First mounting hole; 22. Second mounting hole; 23. First sealing ring; 24. Second sealing ring; 25. Third sealing ring; 26. Fourth sealing ring; 27. First side expansion sleeve; 28. Second side expansion sleeve; 29. ​​First groove; 30. Second groove; 31. First spring contact finger; 32. Second spring contact finger. Detailed Implementation

[0021] like Figure 6 , 7 As shown, and in combination Figure 8-18As shown, the side expansion device of the present invention includes a first side expansion sleeve 27 and a second side expansion sleeve 28. The first side expansion sleeve 27 includes a first insulating sleeve 12 and a first conductive base 11. The second side expansion sleeve 28 includes a second insulating sleeve 15 and a second conductive base 14. The first insulating sleeve 12 and the second insulating sleeve 15 are arranged opposite to each other and coaxially. A first side flange 13 is coaxially arranged and fixedly connected to the end of the first insulating sleeve 12 near the second insulating sleeve 15, that is, the first side flange 13 is coaxially arranged with the first insulating sleeve 12. A second side flange 16 is coaxially arranged and fixedly connected to the end of the second insulating sleeve 15 near the first insulating sleeve 12, that is, the second side flange 16 is coaxially arranged with the second insulating sleeve 15. The end of the first insulating sleeve 12 away from the second insulating sleeve 15 is sealed and fixedly inserted. A first conductive base 11 is provided. A second conductive base 14 is sealed and fixedly inserted into the end of the second insulating sleeve 15 away from the first insulating sleeve 12. A bus connector 09 is provided between the two side flanges (i.e., the first side flange 13 and the second side flange 16). The bus connector 09 includes an insulating cylinder 07 and a conductive element 08. One end of the insulating cylinder 07 passes through the first side flange 13 and is sealed and inserted into the cavity of the first insulating sleeve 12. The other end of the insulating cylinder 07 passes through the second side flange 16 and is sealed and inserted into the cavity of the second insulating sleeve 15. A bus connector grounding wire 10 is connected to the outer wall of the insulating cylinder 07. The bus connector grounding wire 10 is located between the first side flange 13 and the second side flange 16. A conductive element 08 connecting the first conductive base 11 and the second conductive base 14 is fixedly inserted into the cavity of the insulating cylinder 07.

[0022] In the side expansion device of the present invention, the first conductive seat 11 has a first groove 29 on one end located inside the first insulating sleeve 12, and a first spring contact finger 31 arranged circumferentially on the groove wall of the first groove 29. The second conductive seat 14 has a second groove 30 on one end located inside the second insulating sleeve 15, and a second spring contact finger 32 arranged circumferentially on the groove wall of the second groove 30. The conductive element 08 is a conductive tube. One end of the conductive element 08 is inserted into the first spring contact finger 31 in the first groove 29 and in contact with the first spring contact finger 31. The other end of the conductive element 08 is inserted into the second spring contact finger 32 in the second groove 30 and in contact with the second spring contact finger 32.

[0023] In this embodiment, combined with Figure 7 , 14As shown in Figures 15 and 18, the conductive element 08 is a conductive tube, which is fixedly inserted into the cavity of the insulating cylinder 07. The conductive element 08 and the insulating cylinder 07 are arranged coaxially, and both ends of the conductive element 08 are located on the outer sides of both ends of the insulating cylinder 07. After the two ends of the insulating cylinder 07 are respectively inserted into the cavities of the first insulating sleeve 12 and the second insulating sleeve 15, the insulating cylinder 07, the first insulating sleeve 12, and the second insulating sleeve 15 are all arranged coaxially. The two ends of the insulating cylinder 07 abut against the first conductive seat 11 and the second conductive seat 14, respectively. The first groove 29 on the first conductive seat 11 is arranged opposite to the cavity of the insulating cylinder 07, and the second groove 30 on the second conductive seat 14 is arranged opposite to the cavity of the insulating cylinder 07. The two ends of the conductive element 08 are respectively inserted into the first groove 29 and the second groove 30, and respectively inserted into the first spring contact finger 31 and the second spring contact finger 32, thus realizing the connection between the first conductive base 11, the first spring contact finger 31, the conductive element 08, the second spring contact finger 32 and the second conductive base 14.

[0024] In the side expansion device of the present invention, the first insulating sleeve 12 and the first side flange 13 are fixedly connected by a first bolt, and a first sealing ring 23 is provided between the first insulating sleeve 12 and the first side flange 13. The second insulating sleeve 15 and the second side flange 16 are fixedly connected by a second bolt, and a second sealing ring 24 is provided between the second insulating sleeve 15 and the second side flange 16.

[0025] The structure of the first sealing ring 23 and the second sealing ring 24 is as follows: Figure 16 As shown, the first sealing ring 23 can enhance the sealing between the first insulating sleeve 12 and the first side flange 13, and the second sealing ring 24 can enhance the sealing between the second insulating sleeve 15 and the second side flange 16.

[0026] Multiple first bolts and multiple second bolts are provided. The multiple first bolts are evenly spaced along the circumference of the first insulating sleeve 12 / first side flange 13, and the multiple second bolts are evenly spaced along the circumference of the second insulating sleeve 15 / second side flange 16. After the first insulating sleeve 12 and the first side flange 13 are fixedly connected by the first bolts, they abut against each other; after the second insulating sleeve 15 and the second side flange 16 are fixedly connected by the second bolts, they abut against each other.

[0027] like Figure 1-3 As shown, and in combination Figure 4-18As shown, the C-GIS device of this invention includes three or more cabinet units 01 connected side by side in sequence. Two adjacent cabinet units 01 are respectively a first cabinet unit 01 and a second cabinet unit 01. The air chamber side plate 06 of the first cabinet unit 01 near the second cabinet unit 01 has three first through holes 17, and the air chamber side plate 06 of the second cabinet unit 01 near the first cabinet unit 01 has three second through holes 18. The three first through holes 17 and the three second through holes 18 are arranged in a one-to-one correspondence. The aforementioned side expansion device connects the first through hole 17 and the corresponding second through hole 18. The first side flange 13 is sealed and fixedly connected to the first through hole 17. The first side flange 13 and the first side expansion sleeve 27 (i.e., the first insulating sleeve 12 and the first conductive base 11) are both located within the air chamber 02 of the first cabinet unit 01. The second side flange 16 is sealed and fixedly connected to the second through hole. At position 18, the second side flange 16 and the second side expansion sleeve 28 (the second side expansion sleeve 28 is also the second insulating sleeve 15 and the second conductive seat 14) are both located in the air chamber 02 of the second cabinet unit 01. One end of the insulating cylinder 07 passes through the first through hole 17 and the first side flange 13 in sequence and is then sealed and inserted into the cavity of the first insulating sleeve 12. The other end of the insulating cylinder 07 passes through the second through hole 18 and the second side flange 16 in sequence and is then sealed and inserted into the cavity of the second insulating sleeve 15. The bus connector grounding wire 10 is located between the first cabinet unit 01 and the second cabinet unit 01. The bus connector grounding wire 10 is connected to the outer wall of the air chamber 02 of the first cabinet unit 01 or the second cabinet unit 01. The A, B, and C three-phase busbars 05 of the first cabinet unit 01 are respectively connected to the three first conductive seats 11. The A, B, and C three-phase busbars 05 of the second cabinet unit 01 are respectively connected to the three second conductive seats 14.

[0028] Three sets of corresponding first through holes 17 and second through holes 18 are provided between the first cabinet unit 01 and the second cabinet unit 01. A side expansion device is connected between each set of corresponding first through holes 17 and second through holes 18, so there are three side expansion devices.

[0029] The busbar 05 in the first cabinet unit 01 is connected to the first conductive base 11 of the side expansion device, and the busbar 05 in the second cabinet unit 01 is connected to the second conductive base 14 of the side expansion device. Since the first conductive base 11, the first spring contact finger 31, the conductive element 08, the second spring contact finger 32, and the second conductive base 14 of the side expansion device are connected, the busbar 05 in the first cabinet unit 01 can be connected to the busbar 05 in the second cabinet unit 01 through the side expansion device. In this way, all cabinet units 01 in the C-GIS equipment are connected to each other via the side expansion device.

[0030] like Figure 8-13 As shown in Figure 17, in the C-GIS equipment of the present invention, a plurality of first screws 19 are arranged circumferentially on the air chamber side plate 06 at the first through hole 17 of the first cabinet unit 01. The plurality of first screws 19 are all located in the air chamber 02 of the first cabinet unit 01. A plurality of first mounting holes 21 are arranged circumferentially on the first side flange 13. The plurality of first screws 19 are arranged one-to-one with the plurality of first mounting holes 21. After the first screws 19 pass through the corresponding first mounting holes 21, they are threadedly connected to the first nut. A first elastic washer is provided between the first nut and the first side flange 13.

[0031] In the C-GIS equipment of this invention, a third sealing ring 25 is provided between the first side flange 13 and the air chamber side plate 06 of the first cabinet unit 01 near the second cabinet unit 01. The structure of the third sealing ring 25 is as follows: Figure 17 As shown.

[0032] Multiple first screws 19 are arranged circumferentially along the first through hole 17. The first screws 19 cooperate with the first nut to fix the first side flange 13 to the air chamber side plate 06 of the first cabinet unit 01 near the second cabinet unit 01. That is, the whole consisting of the first side flange 13 and the first side expansion sleeve 27 is fixedly connected to the air chamber side plate 06 of the first cabinet unit 01 near the second cabinet unit 01. At this time, the first side flange 13 is coaxially arranged with the first through hole 17. Since the first conductive seat 11 is sealed and inserted into the first insulating sleeve 12, the first insulating sleeve 12 and the first side flange 13 are sealed and fixedly connected (the first sealing ring 23 can enhance the sealing performance between the two), and the first side flange 13 is sealed and fixedly connected to the air chamber side plate 06 of the first cabinet unit 01 near the second cabinet unit 01 (the third sealing ring 25 can enhance the sealing performance between the two), the gas in the air chamber 02 of the first cabinet unit 01 will not leak from the first side flange 13 and the first side expansion sleeve 27. In this embodiment, for each first through hole 17 and the first side flange 13 mounted thereon, there are six first screws 19, six first mounting holes 21, six first nuts and six first elastic washers.

[0033] In the C-GIS equipment of the present invention, a plurality of second screws 20 are provided on the air chamber side plate 06 at the second through hole 18 of the second cabinet unit 01. The plurality of second screws 20 are all located in the air chamber 02 of the second cabinet unit 01. A plurality of second mounting holes 22 are provided on the second side flange 16. The plurality of second screws 20 are arranged in a one-to-one correspondence with the plurality of second mounting holes 22. The second screws 20 are threadedly connected to the second nut after passing through the corresponding second mounting hole 22. A second elastic washer is provided between the second nut and the second side flange 16.

[0034] In the C-GIS equipment of this invention, a fourth sealing ring 26 is provided between the second side flange 16 and the air chamber side plate 06 of the second cabinet unit 01 near the first cabinet unit 01. The structure of the fourth sealing ring 26 is as follows: Figure 17 As shown.

[0035] Multiple second screws 20 are arranged circumferentially along the second through hole 18. The second screws 20 cooperate with the second nut to fix the second side flange 16 to the air chamber side plate 06 of the second cabinet unit 01 near the first cabinet unit 01. That is, the second side flange 16 and the second side expansion sleeve 28 are fixedly connected to the air chamber side plate 06 of the second cabinet unit 01 near the first cabinet unit 01. At this time, the second side flange 16 is coaxially arranged with the second through hole 18. Since the second conductive seat 14 is sealed and inserted into the second insulating sleeve 15, the second insulating sleeve 15 and the second side flange 16 are sealed and fixedly connected (the second sealing ring 24 can enhance the sealing performance between the two). The second side flange 16 is sealed and fixedly connected to the air chamber side plate 06 of the second cabinet unit 01 near the first cabinet unit 01 (the fourth sealing ring 26 can enhance the sealing performance between the two). Therefore, the gas in the air chamber 02 of the second cabinet unit 01 will not leak from the second side flange 16 and the second side expansion sleeve 28. In this embodiment, for each second through hole 18 and the second side flange 16 mounted thereon, there are six second screws 20, six second mounting holes 22, six second nuts and six second elastic washers.

[0036] like Figure 1 As shown, and in combination Figure 2-18 As shown, the self-separation method of the C-GIS device in this invention includes the following steps: a) Remove the faulty cabinet unit 01 located in the middle. a1) When a fault occurs in one of the cabinet units 01 located in the middle, the power supply to the line should be cut off and the main busbar should be reliably grounded. If the gas chamber 02 of the faulty cabinet unit 01 is filled with SF6 gas, the gas needs to be recovered first. The faulty cabinet unit 01 is regarded as the first cabinet unit 01, the normal cabinet unit 01 located to the left of the first cabinet unit 01 is regarded as the second cabinet unit 01 on the left, and the normal cabinet unit 01 located to the right of the first cabinet unit 01 is regarded as the second cabinet unit 01 on the right. a2) Remove the grounding wire 10 of the bus connector between the first cabinet unit 01 and the left second cabinet unit 01 and the right second cabinet unit 01 from the outer wall of the air chamber 02 of the first cabinet unit 01 or the second cabinet unit 01. a3) Remove the inspection plate 03 at the rear of the first cabinet unit 01. a4) Remove the A-phase busbar 05 from the air chamber 02 of the first cabinet unit 01. (a5) Remove the first side flange 13 on the left side of phase A of the first cabinet unit 01 from the left side chamber side plate 06 of the first cabinet unit 01. This removes the entire assembly consisting of the first side flange 13 on the left side of phase A and the first side expansion sleeve 27 from the left side chamber side plate 06 of the first cabinet unit 01. Then remove the first side flange 13 on the right side of phase A of the first cabinet unit 01 from the right side chamber side plate 06 of the first cabinet unit 01. This removes the entire assembly consisting of the first side flange 13 on the right side of phase A and the first side expansion sleeve 27 from the right side chamber side plate 06 of the first cabinet unit 01. a6) Unplug the bus connectors 09 on the left and right sides of the first cabinet unit 01A. a7) Following steps a4)-a6), disconnect the bus connectors 09 on both sides of phase B and phase C in sequence. a8) Sequentially remove all connecting parts between the first cabinet unit 01 and the second cabinet unit 01 on the left and right sides, push the first cabinet unit 01 forward or backward along the guide rail, and remove it from the site. b) Installation of spare cabinet unit 01 b1) Push the spare cabinet unit 01, which has the same structure as the first cabinet unit 01, into the original position of the first cabinet unit 01, and remove the maintenance plate 03 at the rear of the spare cabinet unit 01. b2) Insert the left-side busbar connector 09 of phase A into the first through hole 17 on the left side of the spare cabinet unit 01, so that the busbar connector grounding wire 10 on the left-side busbar connector 09 of phase A is located between the spare cabinet unit 01 and the second cabinet unit on the left. Then install the first-side flange 13 of phase A on the left side of the air chamber side plate 06 of the spare cabinet unit 01. In this way, the whole assembly consisting of the first-side flange 13 of phase A and the first-side expansion sleeve 27 is installed on the left side of the air chamber side plate 06 of the spare cabinet unit 01. Insert the right-side busbar connector 09 of phase A into the first through hole 17 on the right side of the spare cabinet unit 01, so that the busbar connector grounding wire 10 on the right-side busbar connector 09 of phase A is located between the spare cabinet unit 01 and the second cabinet unit on the right. Then install the right-side first side flange 13 of phase A on the right-side air chamber side plate 06 of the spare cabinet unit 01. In this way, the whole assembly consisting of the right-side first side flange 13 of phase A and the first side expansion sleeve 27 is installed on the right-side air chamber side plate 06 of the spare cabinet unit 01. b3) Connect both ends of the A-phase busbar 05 to the first conductive base 11 of the first side expansion sleeve 27 on the left and right sides of the A-phase busbar 05 respectively, and install the A-phase busbar 05. b4) Following steps b2)-b3), install phase B busbar 05 and phase C busbar 05 in sequence. b5) Install the maintenance panel 03 at the rear of the spare cabinet unit 01. b6) Connect the grounding wire 10 of the bus connector between the spare cabinet unit 01 and the second cabinet unit 01 on the left and the second cabinet unit 01 on the right to the outer wall of the air chamber 02 of the spare cabinet unit 01 or the second cabinet unit 01. b7) Connect all the connectors between the spare cabinet unit 01 and the second cabinet unit 01 on the left and the second cabinet unit 01 on the right. b8) Evacuate the air chamber 02 of the backup cabinet unit 01, and fill the air chamber 02 of the backup cabinet unit 01 with SF6 gas or other environmentally friendly gas to the specified pressure range. b9) Conduct necessary sealing and insulation tests. Only after passing the tests can the power supply procedure be performed.

[0037] In step a1) above, the first cabinet unit 01 and the second cabinet unit 01 on the left are two adjacent cabinet units 01, and the three-phase busbar 05 between them is connected through three side expansion devices; the first cabinet unit 01 and the second cabinet unit 01 on the right are also two adjacent cabinet units 01, and the three-phase busbar 05 between them is also connected through three side expansion devices. That is to say, for two adjacent cabinet units 01, the A-phase busbar 05 between them is connected through the first side expansion device, the B-phase busbar 05 between them is connected through the second side expansion device, and the C-phase busbar 05 between them is connected through the third side expansion device.

[0038] In step a3) above, the disassembled inspection plate 03 is specifically the inspection plate 03 located above the rear of the first cabinet unit 01, which seals the air chamber 02 of the first cabinet unit 01. In step b1) above, the disassembled inspection plate 03 is specifically the inspection plate 03 located above the rear of the spare cabinet unit 01, which seals the air chamber 02 of the spare cabinet unit 01. Figure 4 , 5 As shown, in order to enhance the sealing performance between the inspection plate 03 and the air chamber 02 of the cabinet unit 01, an inspection plate sealing ring 04 is provided between the inspection plate 03 and the cabinet unit 01.

[0039] In step b2) above, the left-side busbar connector 09 of phase A is inserted into the first through hole 17 on the left side of the spare cabinet unit 01. Specifically, the busbar connector 09 passes through the first through hole 17 and the second through hole 18 of the left-side second cabinet unit 01 corresponding to the first through hole 17. Then, the left ends of the insulating sleeve 07 and the conductive element 08 of the busbar connector 09 are respectively inserted into the right-side second side expansion sleeve 28 of phase A in the air chamber 02 of the left-side second cabinet unit 01 (specifically, into the cavity of the second insulating sleeve 15 and the second groove 30 of the second conductive seat 14). When the left-side first side flange 13 of phase A is installed on the left-side air chamber side plate 06 of the spare cabinet unit 01, the right ends of the insulating sleeve 07 and the conductive element 08 of the busbar connector 09 are respectively inserted into the left-side first side expansion sleeve 27 of phase A in the spare cabinet unit 01 (specifically, into the cavity of the first insulating sleeve 12 and the first groove 29 of the first conductive seat 11). This enables the first conductive seat 11 of the first side extension sleeve 27 on the left side of phase A in the standby cabinet unit 01 to be connected to the phase A busbar 05 in the second cabinet unit 01 on the left side.

[0040] The specific method of inserting the right busbar connector 09 of phase A into the first through hole 17 on the right side of the spare cabinet unit 01 is the same as the method of inserting the left busbar connector 09 of phase A into the first through hole 17 on the left side of the spare cabinet unit 01, which can realize the connection between the first conductive seat 11 of the right side expansion sleeve 27 of phase A in the spare cabinet unit 01 and the phase A busbar 05 in the right side second cabinet unit 01.

[0041] In step b3) above, after connecting the two ends of the A-phase busbar 05 to the first conductive base 11 of the first side extension sleeve 27 on the left and right sides of the A-phase busbar 05 respectively, the A-phase busbar 05 in the spare cabinet unit 01 can be connected to the A-phase busbar 05 in the second cabinet unit 01 on the left and right sides respectively.

[0042] In step b4) above, after installing the B-phase and C-phase busbars 05, the B-phase busbar 05 in the standby cabinet unit 01 can be connected to the B-phase busbar 05 in the left and right second cabinet units 01 respectively, and the C-phase busbar 05 in the standby cabinet unit 01 can be connected to the C-phase busbar 05 in the left and right second cabinet units 01 respectively.

[0043] In steps a8) and b7) above, all connecting parts refer to the connecting parts such as wiring, control cables, power cables, and assembly bolts between two adjacent cabinet units 01.

[0044] After the busbar 05 between two adjacent cabinet units 01 is connected through the side extension device, the grounding wire 10 of the busbar connector between the two adjacent cabinet units 01 is connected to the outer wall of the air chamber 02 of either one of them. That is, the grounding wire 10 of the busbar connector between the first cabinet unit 01 and the second cabinet unit 01 is connected to the outer wall of the air chamber 02 of the first cabinet unit 01 or the second cabinet unit 01, as mentioned above. Also, the grounding wire 10 of the busbar connector between the spare cabinet unit 01 and the second cabinet units 01 on the left and right sides is connected to the outer wall of the air chamber 02 of the spare cabinet unit 01 or the second cabinet unit 01 to achieve the purpose of grounding. When connecting the three busbar connector grounding wires 10 between two adjacent cabinet units 01 to the outer wall of the air chamber 02 of either unit, three M8 short-cycle solder pins are pre-installed on the outer wall of the air chamber 02. The three busbar connector grounding wires 10 are connected to the three M8 short-cycle solder pins respectively, and then tightened using M8 hexagonal nuts, flat washers, and spring washers to complete the connection. When it is necessary to remove the busbar connector grounding wires 10 from the outer wall of the air chamber 02, simply unscrew the M8 hexagonal nuts from the M8 short-cycle solder pins to remove the busbar connector grounding wires 10.

[0045] The side expansion device, C-GIS equipment, and self-separation method of this invention differ from existing technologies in that if a cabinet unit 01 in the middle of the C-GIS equipment in this invention malfunctions, the inspection board 03 of the malfunctioning cabinet unit 01 can be disassembled separately. Then, the three-phase busbar 05 located within the malfunctioning cabinet unit 01 can be removed. Next, the side expansion device components on both sides can be disassembled, thus breaking the busbar 05 connection between the malfunctioning cabinet unit 01 and the normal cabinet units 01 on both sides. Finally, all connecting parts between the malfunctioning cabinet unit 01 and the normal cabinet units 01 on both sides can be removed, allowing the malfunctioning cabinet unit 01 to be moved out. Then, push the spare cabinet unit 01 to the position where the original faulty cabinet unit 01 was located, remove the inspection plate 03 on the spare cabinet unit 01, connect the side expansion device components on the left and right sides inside the spare cabinet unit 01, connect the three-phase bus 05, install the inspection plate 03 on the spare cabinet unit 01, and connect all the connecting parts of the spare cabinet unit 01 with the normal cabinet units 01 on the left and right sides. This completes the independent removal of the faulty cabinet unit 01 and the quick replacement of the spare cabinet unit 01, solving the problem that the adjacent cabinet units 01 need to be moved and disassembled when the intermediate cabinet unit 01 of the existing C-GIS equipment is replaced due to a fault.

[0046] In this embodiment, the C-GIS device includes seven switch cabinets connected side by side (i.e., the cabinet unit 01 mentioned above). Figure 1 , 3Figure 6 shows the completed assembly of the seven switchgear cabinets. During assembly, the cabinets are assembled from left to right, first fixing one switchgear cabinet to its designated installation position. Next, one end of each of the three busbar connectors 09 is inserted into the side expansion sleeves of phases A, B, and C of this switchgear cabinet; simultaneously, the three busbar connector grounding wires 10 are fixed to the three pre-set M8 short-cycle studs on the outer wall of the gas chamber 02, and tightened using M8 hexagonal nuts with flat washers and spring washers. Then, the adjacent switchgear cabinet is moved to the right side of this cabinet, maintaining a gap of approximately 200mm, and guided and positioned using the assembly guide rod. Next, the adjacent cabinet is moved, and the other end of the busbar connectors 09 is inserted into the corresponding side expansion sleeves of phases A, B, and C of that adjacent switchgear cabinet, and the two switchgear cabinets are tightened together using assembly bolts and nuts, completing the assembly of the second switchgear cabinet. The remaining switchgear cabinets are assembled one by one according to this process until all are completed.

[0047] The C-GIS equipment in this invention, through the air chamber 02 sealing design, completely isolates the busbar 05 of each cabinet unit 01 from the external environment, effectively resisting the intrusion of dirt, condensation, and moisture, and significantly improving insulation reliability. When an intermediate cabinet unit 01 fails, this design avoids moving or disassembling adjacent cabinet units 01, enabling independent removal of the faulty cabinet unit and rapid replacement of the spare cabinet unit 01.

[0048] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", 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 the present 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 the present invention.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A side-expansion device, characterized in that: The system includes a first side expansion sleeve and a second side expansion sleeve. The first side expansion sleeve includes a first insulating sleeve and a first conductive base. The second side expansion sleeve includes a second insulating sleeve and a second conductive base. The first and second insulating sleeves are arranged coaxially opposite to each other. A first side flange is sealed and fixedly connected to the end of the first insulating sleeve near the second insulating sleeve, and a second side flange is sealed and fixedly connected to the end of the second insulating sleeve near the first insulating sleeve. A first conductive base is sealed and fixedly inserted into the end of the first insulating sleeve away from the second insulating sleeve. A second conductive seat is sealed and fixedly inserted at the end of the tube away from the first insulating sleeve. A bus connector is provided between the two side flanges. The bus connector includes an insulating cylinder and a conductive element. One end of the insulating cylinder passes through the first side flange and is sealed and inserted into the cavity of the first insulating sleeve. The other end of the insulating cylinder passes through the second side flange and is sealed and inserted into the cavity of the second insulating sleeve. A bus connector grounding wire is connected to the outer wall of the insulating cylinder. The bus connector grounding wire is located between the first side flange and the second side flange. A conductive element connecting the first conductive seat and the second conductive seat is inserted into the cavity of the insulating cylinder.

2. The side extension device according to claim 1, characterized in that: The first conductive base has a first groove at one end inside the first insulating sleeve, and a first spring contact finger arranged circumferentially on the groove wall of the first groove. The second conductive base has a second groove at one end inside the second insulating sleeve, and a second spring contact finger arranged circumferentially on the groove wall of the second groove. The conductive element is a conductive tube. One end of the conductive element is inserted into the first spring contact finger in the first groove and in contact with the first spring contact finger. The other end of the conductive element is inserted into the second spring contact finger in the second groove and in contact with the second spring contact finger.

3. The side extension device according to claim 2, characterized in that: The first insulating sleeve and the first side flange are fixedly connected by a first bolt, and a first sealing ring is provided between the first insulating sleeve and the first side flange. The second insulating sleeve and the second side flange are fixedly connected by a second bolt, and a second sealing ring is provided between the second insulating sleeve and the second side flange.

4. A C-GIS device, comprising three or more cabinet units connected side-by-side in sequence, characterized in that: Two adjacent cabinet units are designated as a first cabinet unit and a second cabinet unit. The first cabinet unit has three first through holes on its side panel near the second cabinet unit, and the second cabinet unit has three second through holes on its side panel near the first cabinet unit. The three first through holes and three second through holes are arranged in a one-to-one correspondence. A side expansion device as described in any one of claims 1-3 connects the first through holes and their corresponding second through holes. A first side flange is sealed and fixedly connected to the first through hole. Both the first side flange and the first side expansion sleeve are located within the air chamber of the first cabinet unit. A second side flange is sealed and fixedly connected to the second through hole. Both the first and second side expansion sleeves are located in the air chamber of the second cabinet unit. One end of the insulating cylinder passes through the first through hole and the first side flange in sequence and is then sealed and inserted into the cavity of the first insulating sleeve. The other end of the insulating cylinder passes through the second through hole and the second side flange in sequence and is then sealed and inserted into the cavity of the second insulating sleeve. The grounding wire of the bus connector is located between the first and second cabinet units. The grounding wire of the bus connector is connected to the outer side wall of the air chamber of the first or second cabinet unit. The A, B, and C phase busbars of the first cabinet unit are respectively connected to three first conductive bases, and the A, B, and C phase busbars of the second cabinet unit are respectively connected to three second conductive bases.

5. The C-GIS equipment according to claim 4, characterized in that: The first cabinet unit has a plurality of first screws arranged circumferentially on the air chamber side plate at the first through hole. The plurality of first screws are all located in the air chamber of the first cabinet unit. The first side flange has a plurality of first mounting holes arranged circumferentially. The plurality of first screws are arranged one-to-one with the plurality of first mounting holes. After the first screw passes through the corresponding first mounting hole, it is threadedly connected to the first nut. A first elastic washer is provided between the first nut and the first side flange.

6. The C-GIS equipment according to claim 5, characterized in that: A third sealing ring is provided between the first side flange and the air chamber side plate of the first cabinet unit near the second cabinet unit.

7. The C-GIS equipment according to claim 6, characterized in that: The second cabinet unit has a plurality of second screws arranged circumferentially on the air chamber side plate at the second through hole. The plurality of second screws are all located in the air chamber of the second cabinet unit. The second side flange has a plurality of second mounting holes arranged circumferentially. The plurality of second screws are arranged one-to-one with the plurality of second mounting holes. The second screws pass through the corresponding second mounting holes and are threadedly connected to the second nut. A second elastic washer is provided between the second nut and the second side flange.

8. The C-GIS equipment according to claim 7, characterized in that: A fourth sealing ring is provided between the second side flange and the air chamber side plate of the second cabinet unit near the first cabinet unit.

9. A self-separation method for a C-GIS device according to any one of claims 4-8, characterized in that, Includes the following steps: a) Removal of the faulty cabinet unit located in the middle. a1) When a fault occurs in one of the cabinet units located in the middle, the power supply to the line should be cut off and the main busbar should be reliably grounded. If the gas chamber of the faulty cabinet unit is filled with SF6 gas, the gas needs to be recovered first. The faulty cabinet unit is regarded as the first cabinet unit, the normal cabinet unit located to the left of the first cabinet unit is regarded as the second cabinet unit on the left, and the normal cabinet unit located to the right of the first cabinet unit is regarded as the second cabinet unit on the right. a2) Remove the grounding wire of the bus connector between the first cabinet unit and the left and right second cabinet units from the outer wall of the air chamber of the first or second cabinet unit. a3) Remove the inspection panel at the rear of the first cabinet unit. a4) Remove the A-phase busbar from the air chamber of the first cabinet unit. (a5) Remove the first side flange on the left side of phase A of the first cabinet unit from the left side panel of the air chamber of the first cabinet unit. This will remove the entire assembly consisting of the first side flange and the first side expansion sleeve on the left side of phase A from the left side panel of the air chamber of the first cabinet unit. Then, remove the first side flange on the right side of phase A of the first cabinet unit from the right side panel of the air chamber of the first cabinet unit. This will remove the entire assembly consisting of the first side flange and the first side expansion sleeve on the right side of the air chamber of the first cabinet unit. a6) Unplug the busbar connectors on the left and right sides of phase A of the first cabinet unit. a7) Following steps a4)-a6), disconnect the bus connectors on the left and right sides of phase B and phase C in sequence. a8) Sequentially remove all connecting parts between the first cabinet unit and the second cabinet unit on the left and right sides. Push the first cabinet unit forward or backward along the guide rail and remove it from the site. b) Installation of spare cabinet units b1) Push the spare cabinet unit, which has the same structure as the first cabinet unit, into the original position of the first cabinet unit, and remove the maintenance panel at the rear of the spare cabinet unit. b2) Insert the left-side busbar connector of phase A into the first through hole on the left side of the spare cabinet unit, ensuring that the grounding wire of the busbar connector on the left side of phase A is located between the spare cabinet unit and the second cabinet unit on the left. Then, install the first-side flange on the left side of phase A onto the left air chamber side plate of the spare cabinet unit. This completes the installation of the first-side flange on the left side of phase A and the first-side expansion sleeve onto the left air chamber side plate of the spare cabinet unit. Insert the right-side busbar connector of phase A into the first through hole on the right side of the spare cabinet unit, ensuring that the grounding wire of the busbar connector on the right side of phase A is located between the spare cabinet unit and the second cabinet unit on the right. Then, install the first-side flange on the right side of phase A onto the right-side air chamber side plate of the spare cabinet unit. This completes the installation of the first-side flange on the right side of phase A and the first-side expansion sleeve onto the right-side air chamber side plate of the spare cabinet unit. b3) Connect both ends of phase A busbar to the first conductive base of the first side expansion bushing on the left and right sides of phase A respectively, and install phase A busbar. b4) Following steps b2)-b3), install the B-phase busbar and C-phase busbar in sequence. b5) Install the access panel at the rear of the spare cabinet unit. b6) Connect the grounding wire of the bus connector between the spare cabinet unit and the second cabinet unit on the left and the second cabinet unit on the right to the outer wall of the air chamber of the spare cabinet unit or the second cabinet unit. b7) Connect all the connectors between the spare cabinet unit and the second cabinet unit on the left and the second cabinet unit on the right. b8) Evacuate the air chamber of the standby cabinet unit and fill the air chamber of the standby cabinet unit with SF6 gas or other environmentally friendly gas to the specified pressure range. b9) Conduct necessary sealing and insulation tests. Only after passing the tests can the power supply procedure be performed.

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