Inflatable semi-insulating high-voltage switch cabinet

Abstract

The invention belongs to the field of high-voltage switch cabinets, and relates to an inflatable semi-insulating high-voltage switch cabinet which is characterized in that a bus chamber, a gas tank and a cable chamber are arranged in the middle of the interior of a cabinet body frame, an instrument chamber, a mechanism chamber and a front cable chamber are arranged at the front end of the interior of the cabinet body frame, a maintenance opening is reserved in a rear cover plate of the gas tank, and a rear sealing plate of the gas tank is hermetically mounted at the position corresponding to the maintenance opening; an anti-explosion through hole is formed in the center of the gas tank rear sealing plate, the anti-explosion piece is installed at the anti-explosion through hole, a connecting opening communicated with the mechanism chamber is reserved in the gas tank front cover plate, the gas tank front sealing plate is installed at the position corresponding to the connecting opening in a sealed mode, and the supporting insulator, the three-station mechanism conductive piece and the circuit breaker pole are installed in the gas tank. The three-station operating mechanism, the inflation inlet and the circuit breaker operating mechanism are installed in the mechanism chamber, the inflation inlet is communicated with the gas box in a sealed mode, and the gas box is filled with insulating gas. According to the invention, the operation difficulty can be reduced, and the circuit breaker, the three-position mechanism and other core components can be free of maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage switch cabinets, and in particular relates to a novel inflatable semi-insulated high-voltage switch cabinet. Background Art

[0002] like Figure 1 The following are the structures of two common high-voltage switchgear products.

[0003] Figure 1 The classic cabinet type KYN28-12 high-voltage switch cabinet shown in a is an air-insulated type. The main busbar adopts copper busbar lap connection. Under the requirement of ensuring the air clearance, the busbars inside the cabinet frame are directly connected by copper busbars. The circuit breaker adopts a trolley structure and is connected to the busbar through upper and lower contacts. The incoming and outgoing cables are connected by lap plates and cold-pressed terminal bolts.

[0004] The current development trend is that high-voltage switchgear is gradually miniaturized during design and use, which will lead to the compression of the size of functional chambers such as the trolley room, cable room, instrument room, and busbar room. Figure 1 The high-voltage switchgear structure shown in a adopts air-type insulation, and the first condition is that it must meet the air clearance requirements, so the cabinet size cannot be designed to be reduced.

[0005] Figure 1 The inflatable XGN-12 high-voltage switchgear shown in b realizes full electrical insulation. The main busbar adopts the connection form of elbow head and solid busbar. The three-position mechanism (the three-position mechanism is a common component in the high-voltage switchgear. The "three positions" refer to the closing position, the grounding position and the isolation position. The state switching is performed through the three-position mechanism) and core components such as circuit breakers are installed inside the closed gas box, and the incoming and outgoing cables are connected in the form of elbow heads.

[0006] According to the existing technical solutions, although the XGN type inflatable cabinet has achieved full electrical insulation, the elbow head and solid busbar have strong structural rigidity and relatively weak adaptability, so the installation process is extremely complex, and the high-voltage switch cabinet processing size and on-site cabinet size accuracy are very high, which easily generates elbow head and solid busbar installation stress. At the same time, the elbow head cable installation and manufacturing process is complex and requires high precision, which makes on-site installation time-consuming and labor-intensive. And for solutions that require multiple cables in and out, it is necessary to consider increasing the cabinet depth during the design. If the cable connection needs to be added later on site, the cabinet needs to be replaced (the cabinet depth size needs to be modified) to meet the use requirements, which brings inconvenience to electricity use.

[0007] In summary, the existing high-voltage switchgear structure increases on-site construction time and safety risks, and has unreasonable structural forms. Summary of the invention

[0008] In order to solve the above technical problems existing in the existing solutions, the present invention proposes a new type of inflatable semi-insulated high-voltage switchgear through innovative research and design, combining the advantages of conventional inflatable cabinets and air-insulated switchgear. The technical solution adopted by the present invention is: An inflatable semi-insulated high-voltage switchgear comprises a cabinet frame of a rectangular structure, wherein a busbar room, a gas box and a cable room are arranged from top to bottom in the middle position inside the cabinet frame, and an instrument room, a mechanism room and a front cable room are arranged from top to bottom in the front end position inside the cabinet frame, wherein the gas box is a six-sided stainless steel closed box, an inspection opening is reserved on the rear cover plate of the gas box, a rear sealing plate of the gas box is sealed and installed at the position corresponding to the inspection opening, an explosion-proof through hole is provided at the center position of the rear sealing plate of the gas box, an explosion-proof plate is installed at the explosion-proof through hole, a connecting opening connected to the mechanism room is reserved on the front cover plate of the gas box, a front sealing plate of the gas box is sealed and installed at the position corresponding to the connecting opening, a pillar insulator, a three-station mechanism conductive part and a circuit breaker pole are installed inside the gas box, a three-station operating mechanism, a charging port and a circuit breaker operating mechanism are installed inside the mechanism room, the charging port is sealed and connected to the gas box, and the gas box is filled with insulating gas.

[0009] Preferably, the busbar chamber comprises a busbar chamber upper cover plate and a busbar chamber rear cover plate which are fixedly connected.

[0010] Preferably, a hole is opened on the upper cover plate of the busbar chamber to install a busbar chamber pressure relief cover.

[0011] Preferably, busbar insulator 1 and busbar insulator 2 are respectively mounted on the upper cover plate and the lower cover plate of the gas box by screws, busbar insulator 1 and busbar insulator 2 include an integrally formed pointed end and a column end, the pointed ends of busbar insulator 1 and busbar insulator 2 are respectively located in the gas box, and the column ends of busbar insulator 1 and busbar insulator 2 respectively penetrate the upper cover plate and the lower cover plate of the gas box and extend into the busbar room and the cable room.

[0012] Preferably, a sealing ring 1 is embedded at the connection between busbar insulator 1 and the upper cover plate of the gas box, and a sealing ring 4 is embedded at the connection between busbar insulator 2 and the lower cover plate of the gas box.

[0013] Preferably, the inflation port is connected to a sealing channel, a three-way pipe joint is installed on the sealing channel, a pressure gauge joint is installed on the three-way pipe joint, and the pressure gauge joint is connected to a pressure gauge.

[0014] Preferably, the inner end of the sealing channel is connected to an adapter, which is fixedly mounted on the outer surface of the front sealing plate of the air box and is connected to the connecting opening on the air box. A sealing ring seven is arranged between the adapter and the front sealing plate of the air box. An on-off copper joint is also arranged on the long sealing channel, and the on-off copper joint is located between the adapter and the three-way pipe joint.

[0015] Preferably, a cabinet front cover plate 1, a cabinet front cover plate 2 and a cabinet front cover plate 3 with an opening and closing structure are arranged from top to bottom on the front side of the cabinet frame, a cabinet rear cover plate 1, a cabinet rear cover plate 2 and a cabinet rear cover plate 3 are arranged from top to bottom on the rear side of the cabinet frame, an upper cabinet cover plate and a lower cabinet cover plate are arranged on the top and bottom of the cabinet frame respectively, and a cable hole is opened on the lower cabinet cover plate.

[0016] Preferably, the cabinet rear cover plate is a detachable structure and has heat dissipation holes.

[0017] Preferably, the current transformer is installed in the cable chamber.

[0018] Beneficial effects of the present invention: The inflatable semi-insulated high-voltage switchgear of the present invention can avoid the influence of complex on-site environment on the function of circuit breakers, ensure the safety of electrical equipment, and reduce the difficulty of operation in a limited space as much as possible, while facilitating the increase of the number of cable connections. The main busbar and cable are insulated by copper bar air, which solves the problem of difficult cabinet installation of fully insulated inflatable cabinets and facilitates on-site installation and overhaul and maintenance; a sealed gas box is provided, and insulating gas is filled in the gas box, which improves the working environment of core components such as circuit breakers and three-station mechanisms, making them more reliable and safe, and can realize maintenance-free of core components; it meets the increasing demand for reducing the width of the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of two existing high-voltage switchgears. Figure 1 a Model is KYN28-12, Figure 1 b Model is XGN-12; Figure 2 It is a front view of the inflatable semi-insulated high-voltage switchgear according to an embodiment of the present invention; Figure 3 It is a right side view of the inflatable semi-insulated high-voltage switchgear according to an embodiment of the present invention; Figure 4 It is a rear view of the inflatable semi-insulated high-voltage switchgear according to an embodiment of the present invention; Figure 5 for Figure 3 A partial enlarged view of the air box in FIG. Figure 6 for Figure 5 A partial enlarged view of a busbar insulator; Figure 7 for Figure 5 A partial enlarged view of the inflation port in FIG. Figure 8 for Figure 3 AA view in the middle; In the figure, 1-busbar room, 2-busbar room pressure relief cover, 3-busbar insulator 1, 4-gas box upper cover, 5-gas box, 6-gas box rear cover, 7-explosion-proof plate, 8-pillar insulator, 9-three-position mechanism conductive part, 10-circuit breaker pole, 11-busbar insulator 2, 12-cable room, 13-current transformer, 14-gas box bottom plate, 15-front cable room, 16-mechanism room, 17-circuit breaker operating mechanism, 18-inflating port, 19-three-position operating mechanism, 20-instrument room, 21-cabinet front cover 1, 22-cabinet front cover plate three, 23-cabinet rear cover plate one, 24-cabinet rear cover plate two, 25-cabinet rear cover plate three, 26 is sealing ring one, 27 is sealing ring two, 28 is sealing ring three, 29 is sealing ring four, 30 is sealing ring five, 31 is gas box front cover plate, 32 is gas box front cover plate, 33 is pressure gauge joint, 34 is gas box rear cover plate, 35 is three-position connecting rod, 36 is adapter, 37 is on-off copper joint, 38 is cable hole, 39 is cabinet front cover plate two, 40 is busbar room upper cover plate, 41 is busbar room rear cover plate. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] like Figure 2-8 As shown, a novel inflatable semi-insulated high-voltage switchgear comprises a cabinet frame of a rectangular structure, the front of the cabinet frame is provided with a cabinet front cover plate 1 21, a cabinet front cover plate 2 39 and a cabinet front cover plate 3 22 of an opening and closing structure from top to bottom, and the back of the cabinet frame is provided with a cabinet rear cover plate 1 23, a cabinet rear cover plate 24 and a cabinet rear cover plate 3 25 from top to bottom.

[0022] The busbar chamber 1, the gas box 5 and the cable chamber 12 are arranged in the middle position of the high-voltage switch cabinet frame from top to bottom, and the instrument room 20, the mechanism room 16 and the front cable room 15 are arranged in the front position of the high-voltage switch cabinet frame from top to bottom. Usually, two or more high-voltage switch cabinets need to be assembled side by side for use. The busbar chamber 1 is an L-shaped metal channel composed of a busbar chamber upper cover plate 40 and a busbar chamber rear cover plate 41. The left and right sides of the busbar chamber 1 of the high-voltage switch cabinet located in the middle position are connected, which can facilitate the mutual connection between the busbars of two or more high-voltage switch cabinets. The outer side of the busbar chamber 1 of the high-voltage switch cabinet located at the two outer ends can be blocked with the busbar chamber side cover plate. The main busbar in the busbar room 1 is connected to the grid side. The main busbar is air-insulated and is respectively a three-phase main busbar of phase A (yellow), phase B (green), and phase C (red). They are fixed to the corresponding three busbar insulators 3 by bolts. The main busbar is horizontally arranged inside the independent busbar room 1 in the arrangement of phase A at the back, phase B in the middle, and phase C in the front (i.e., far / middle / near). The connection of the main busbar is completed by the copper bar lap structure, which is safe and convenient. The busbar room rear cover plate 41 at the rear end of the busbar room 1 corresponds to the cabinet rear sealing plate 23. The cabinet rear sealing plate 23 is a detachable structure with heat dissipation holes. The front end of the busbar room 1 is connected to the instrument room 20. The busbar room rear cover plate 41 is provided with an inspection hole. After removing the cabinet rear sealing plate 23, it provides a suitable operating space for the installation and maintenance of the main busbar, making the on-site operation and maintenance of the main busbar more convenient and safe.

[0023] A busbar chamber pressure relief cover 2 is installed on the busbar chamber upper cover plate 40 at the top of the busbar chamber 1. When an extreme power fault such as a short circuit occurs in the main bus, high-temperature and high-pressure gas will be generated in the busbar chamber 1. In severe cases, if there is no pressure relief channel, the busbar chamber 1 may be ruptured as a whole, causing the metal structural parts to fly and possibly injuring maintenance personnel. By releasing pressure through the busbar chamber pressure relief cover 2, safe pressure relief can be achieved, thereby ensuring the integrity of the cabinet and avoiding secondary injuries due to accidents.

[0024] The gas box 5 is a stainless steel sealed box body, which is welded by six stainless steel cover plates, namely, the gas box upper cover plate 4, the gas box lower cover plate 14, the gas box rear cover plate 34, the gas box front cover plate 31, the gas box left cover plate and the gas box right cover plate. The busbar insulator 1 3 and the busbar insulator 2 11 are respectively fixedly mounted on the gas box upper cover plate 4 and the gas box lower cover plate 14 by screws, and the busbar insulator 1 3 and the busbar insulator 2 11 include an integrally formed pointed end and a column end, and the pointed ends of the busbar insulator 1 3 and the busbar insulator 2 11 are respectively located in the gas box 5, and the column ends of the busbar insulator 1 3 and the busbar insulator 2 11 respectively penetrate the gas box upper cover plate 4 and the gas box lower cover plate 14 and extend into the busbar chamber 1 and the cable chamber 12. A sealing ring 26 is embedded at the connection between the busbar insulator 13 and the upper cover plate 4 of the gas box, and a sealing ring 4 is embedded at the connection between the busbar insulator 21 and the lower cover plate 14 of the gas box, and a sealing effect is achieved by using the sealing ring 26 and the sealing ring 4 29. The busbar insulator 13 is connected to the support insulator 8 inside the gas box 5 and fixedly connected to the branch busbars of each phase. The support insulator 8 is fixed on the installation beam, and the two ends of the beam are respectively fixedly installed on the left cover plate and the right cover plate of the gas box. The busbar insulator 21 is connected to the circuit breaker pole 10 inside the gas box 5 and fixedly connected to the branch busbars of each phase. One end of the circuit breaker pole 10 is fixedly installed on the inner side of the front cover plate 31 of the gas box. The circuit breaker pole 10 is located below the support insulator 8. The support insulator 8 and the circuit breaker pole 10 are fixedly connected through the three-position mechanism conductive member 9.

[0025] An inspection opening is reserved on the air box rear cover plate 34, and an air box rear sealing plate 6 is arranged at a position corresponding to the inspection opening on the outer surface of the air box rear cover plate 34. The air box rear sealing plate 6 is connected and fixed by welding screws and mounting nuts on the outer surface of the air box rear cover plate 34, and a sealing ring 27 is embedded between the air box rear sealing plate 6 and the air box rear cover plate 34. A connection opening communicating with the mechanism chamber 16 is reserved on the air box front cover plate 31, and an air box front sealing plate 32 is arranged at a position corresponding to the connection opening on the outer surface of the air box front cover plate 31, and a sealing ring 5 35 is embedded between the air box front sealing plate 32 and the air box front cover plate 31. By arranging the sealing ring 27 and the sealing ring 5 35, a sealing effect is achieved. An explosion-proof through hole is opened at the center of the air box rear sealing plate 6, and the explosion-proof plate 7 is fixedly installed at the explosion-proof through hole on the outer surface of the air box rear sealing plate 6. The explosion-proof plate 7 is fixedly installed on the air box rear sealing plate 6 with countersunk threaded holes by bolts. The explosion-proof plate 7 utilizes the rupture of the diaphragm to release pressure, and it can explode and release pressure at specified temperature and pressure.

[0026] The three-position operating mechanism 19, the inflation port 18 and the circuit breaker operating mechanism 17 are installed in the mechanism chamber 16 from top to bottom. The circuit breaker operating mechanism 17 is fixedly installed on the outer surface of the front sealing plate 32 of the gas box by screws. A sealing ring 6 is arranged between the circuit breaker operating mechanism 17 and the front sealing plate 32 to achieve a sealing effect. The rear end of the circuit breaker pole 10 corresponds to the position of the circuit breaker operating mechanism 17, and passes through the connection opening on the front cover plate 31 of the gas box and the front sealing plate 32 of the gas box to be mechanically connected to each other. The outer end of the inflation port 18 is exposed from the front sealing plate 2 39 of the cabinet. The inflation port 18 is a finished part of a ejector pin type. After the inflation port 18 is connected by an inflation device, the ejector pin can be pushed in to inflate during inflation. The inner end of the inflation port 18 is connected to the outer end of an extended sealing channel, and a three-way pipe joint is installed on the extended sealing channel, and a pressure gauge joint 33 is installed on the three-way pipe joint. The pressure gauge joint 33 is led out through a curved pipe tilted upward and backward. The pressure gauge joint 33 is connected to the pressure gauge installed on the front sealing plate 2 39 of the cabinet. The pressure in the air box 5 can be intuitively understood through the pressure gauge. The inner end of the extended sealing channel is connected to the adapter 36, which is fixedly installed on the outer surface of the rear sealing plate 32 of the air box and is connected to the connecting opening on the air box 5. A sealing ring 7 is arranged between the adapter 36 and the rear sealing plate 32 of the air box to achieve a sealing effect. The extended sealing channel is also provided with an on-off copper joint 37, which is located between the adapter 36 and the three-way pipe joint. The on-off copper joint 37 is similar to a faucet with an on-off function. The on-off copper joint 37 cooperates with the inflation port 18 to achieve double insurance for inflation. One end of the three-position connecting rod 35 is fixedly mounted on the outer surface of the front sealing plate 32 of the air box, and the three-position operating mechanism 19 is fixedly mounted on the outer surface of the front sealing plate 32 of the air box through the three-position connecting rod 35 and the upper and lower connecting screws, and a sealing ring 28 is arranged between the three-position connecting rod 35 and the front sealing plate 32 of the air box to achieve a sealing effect. The front end of the post insulator 8 corresponds to the position of the three-position operating mechanism 19, and passes through the connection opening on the front cover plate 31 of the air box and the front sealing plate 32 of the air box to be mechanically connected to each other.

[0027] By providing sealing rings at various connection points, it is ensured that the external connection function is not restricted, and at the same time the closed structure of the air box 5 is realized to ensure the pressure-maintaining effect of the slightly positive pressure gas filled in.

[0028] The cable chamber 12 is sealed into an integrated chamber structure by the left sealing plate and the right sealing plate of the cable chamber. The current transformer 13 is located in the cable chamber 12. Three current transformers 13 are respectively fixed on the right sealing plate of the cable chamber in the form of back, middle and front. The current transformer 13 and the bus insulator 2 11 are fixedly connected to the branch busbars of each phase. The cable chamber 12 is a cable inlet and outlet channel, which is air-insulated and arranged in the arrangement of phase A at the back, phase B in the middle, and phase C at the front. The cable chamber 12 adopts a reserved lap plate form, and the three-phase branch busbars A, B, and C are arranged in the order of back, middle and front. The structure of the crimped copper terminal block can realize the simultaneous lap connection of multiple cold shrink cable terminals, which is convenient for on-site installation and improves construction efficiency.

[0029] The busbar room side cover, the cable room left cover and the cable room right cover are provided with reinforcing ribs, which can improve the mechanical strength of the cabinet. The cabinet frame is provided with an upper cabinet cover and a lower cabinet cover at the top and bottom respectively. The cabinet frame and the cover form a complete high-voltage switch cabinet. The cover is provided with necessary interfaces and several heat dissipation holes. The cabinet lower cover is provided with a cable hole 38.

[0030] The inflatable semi-insulated high-voltage switchgear provided in the embodiment of the present invention realizes the conduction between the branch busbar inside the gas box 5 and the main busbar outside the busbar chamber 1 through the intermediate conductor of the busbar insulator 1 3; the busbar chamber 1 draws on the main busbar lap connection method of the air-insulated cabinet, and through innovative research, the busbar chamber 1 is designed as an independent compartment, so as to realize the working condition of only the main busbar in the busbar chamber 1. The conduction between the branch busbar inside the gas box 5 and the external branch busbar in the cable chamber 12 is realized through the intermediate conductor of the busbar insulator 2 11. The cable connection adopts the form of the reserved lap plate of the KYN28-12 switchgear. The cable on the load side or the incoming line side on site passes through the cable hole 38 at the bottom of the cabinet body. The connection is supplemented by a pagoda-shaped rubber ring to protect and seal the cable casing. In addition, by making a cold shrink cable terminal on site, the reserved lap plate is fixed with the copper terminal of the cold shrink cable terminal through bolts, so that multiple cables can be connected in and out, and the on-site installation is simple and operable. This technology is mature and reliable and has been used in KYN28 and KYN61 switch cabinets. Under the premise of meeting the air clearance, it can effectively ensure the stable and safe operation of electrical equipment. The core components such as the circuit breaker pole 10 and the three-station mechanism conductive part 9 are placed inside the closed gas box 5. The gas filling port 18 is used to fill the inside of the gas box 5 with slightly positive pressure N2 or SF6 and other insulating gases to ensure the safe operation of the equipment under high-voltage environment, so that the components inside the gas box 5 can be maintenance-free; at the same time, the three-station mechanism conductive part 9 is integrally cast and forged, and has excellent electric field performance. The rear sealing plate 6 of the gas box is a channel for the maintenance of the gas box 5 and the installation of internal components. The explosion-proof plate 7 is a fault pressure relief channel for the gas box 5. When an internal arc accident occurs in extreme cases, the pressure can be released through the explosion-proof plate 7 to reduce the accident loss of the cabinet. In addition, the problem of the size of the air-insulated cabinet is also solved. The circuit breaker pole 10 is equipped with a three-position mechanism conductive part 9, which is customized and molded. Through precise size calculation and verification simulation, the reasonable space layout realizes the miniaturization of the cabinet, and the cabinet width can be reduced to 600mm, which is basically the same as the size of the XGN-12 fully insulated inflatable cabinet. It can effectively save floor space and has strong technical advantages in prefabricated cabins and places with high land costs.

[0031] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0032] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. An inflatable semi-insulated high-voltage switchgear, comprising a cabinet frame of a rectangular parallelepiped structure, characterized in that: A busbar room, a gas box and a cable room are arranged in the middle position inside the cabinet frame from top to bottom, and an instrument room, a mechanism room and a front cable room are arranged in the front position inside the cabinet frame from top to bottom. The gas box is a six-sided stainless steel closed box, and an inspection opening is reserved on the rear cover plate of the gas box. The rear sealing plate of the gas box is sealed and installed at the position corresponding to the inspection opening. An explosion-proof through hole is opened at the center position of the rear sealing plate of the gas box, and an explosion-proof plate is installed at the explosion-proof through hole. A connecting opening connected to the mechanism room is reserved on the front cover plate of the gas box, and the front sealing plate of the gas box is sealed and installed at the position corresponding to the connecting opening. Post insulators, three-position mechanism conductive parts and circuit breaker poles are installed inside the gas box, and the three-position operating mechanism, the charging port and the circuit breaker operating mechanism are installed inside the mechanism room. The charging port is sealed and connected with the gas box, and the gas box is filled with insulating gas.

2. The inflatable semi-insulated high-voltage switchgear according to claim 1, characterized in that: The busbar chamber comprises a busbar chamber upper cover plate and a busbar chamber rear cover plate which are fixedly connected.

3. The inflatable semi-insulated high-voltage switchgear according to claim 2, characterized in that: The busbar chamber upper cover plate is provided with a hole for installing a busbar chamber pressure relief cover.

4. The inflatable semi-insulated high-voltage switchgear according to claim 1, characterized in that: The busbar insulator 1 and the busbar insulator 2 are respectively mounted on the upper cover plate and the lower cover plate of the gas box by screws. The busbar insulator 1 and the busbar insulator 2 include an integrally formed pointed end and a column end. The pointed ends of the busbar insulator 1 and the busbar insulator 2 are respectively located in the gas box, and the column ends of the busbar insulator 1 and the busbar insulator 2 respectively penetrate the upper cover plate and the lower cover plate of the gas box and extend into the busbar room and the cable room.

5. The inflatable semi-insulated high-voltage switchgear according to claim 4, characterized in that: A sealing ring 1 is embedded at the connection between the busbar insulator 1 and the upper cover plate of the gas box, and a sealing ring 4 is embedded at the connection between the busbar insulator 2 and the lower cover plate of the gas box.

6. The inflatable semi-insulated high-voltage switchgear according to claim 1, characterized in that: The inflation port is connected to the sealing channel, a three-way pipe joint is installed on the sealing channel, a pressure gauge joint is installed on the three-way pipe joint, and the pressure gauge joint is connected to the pressure gauge.

7. The inflatable semi-insulated high-voltage switchgear according to claim 6, characterized in that: The inner end of the sealing channel is connected to an adapter, which is fixedly mounted on the outer surface of the front sealing plate of the air box and is connected to the connecting opening on the air box. A sealing ring seven is arranged between the adapter and the front sealing plate of the air box. An on-off copper joint is also arranged on the long sealing channel, and the on-off copper joint is located between the adapter and the three-way pipe joint.

8. The inflatable semi-insulated high-voltage switchgear according to claim 1, characterized in that: A cabinet front covering plate 1, a cabinet front covering plate 2 and a cabinet front covering plate 3 with an opening and closing structure are arranged from top to bottom on the front side of the cabinet frame, a cabinet rear covering plate 1, a cabinet rear covering plate 2 and a cabinet rear covering plate 3 are arranged from top to bottom on the rear side of the cabinet frame, an upper cabinet covering plate and a lower cabinet covering plate are arranged on the top and bottom of the cabinet frame respectively, and a cable hole is opened on the lower cabinet covering plate.

9. The inflatable semi-insulated high-voltage switchgear according to claim 8, characterized in that: The cabinet rear cover plate 1 is a detachable structure and has heat dissipation holes.

10. The inflatable semi-insulated high-voltage switchgear according to claim 1, characterized in that: The current transformer is installed in the cable chamber.

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