Inflatable semi-insulating high-voltage switch cabinet

Abstract

The utility model 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 inside a cabinet body frame, an instrument chamber, a mechanism chamber and a front cable chamber are arranged at the front end inside the cabinet body frame, and a maintenance opening is reserved on a rear cover plate of the gas tank; a gas tank rear sealing plate is installed at the position corresponding to the overhaul opening in a sealed mode, an anti-explosion through hole is formed in the center of the gas tank rear sealing plate, an 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, and a gas tank front sealing plate is installed at the position corresponding to the connecting opening in a sealed mode. The post insulator, the three-station mechanism conductive part and the circuit breaker pole are installed in the air box, 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 air box in a sealed mode, and the air box is filled with insulating gas. According to the utility model, 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] This utility model belongs to the field of high-voltage switchgear technology, specifically relating to a novel gas-filled semi-insulated high-voltage switchgear. Background Technology

[0002] like Figure 1 The image shows the structure of two common high-voltage switchgear products.

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

[0004] The trend in the design and use of high-voltage switchgear is towards miniaturization, which will lead to a reduction in the size of functional compartments such as the truck compartment, cable compartment, instrument compartment, and busbar compartment. Figure 1 The high-voltage switchgear structure shown in section 1a requires meeting the air clearance requirement due to the use of air insulation, which means that the cabinet size cannot be reduced.

[0005] Figure 1 The gas-insulated XGN-12 high-voltage switchgear shown in section 1b achieves full electrical insulation. The main busbar adopts an elbow-type head and solid busbar connection form. The three-position mechanism (the three-position mechanism is a common component in high-voltage switchgear. "Three positions" refers to the closing position, grounding position and isolation position, and the state switching is performed through the three-position mechanism) and circuit breakers and other core components are installed inside the closed gas box. The incoming and outgoing cables adopt an elbow-type head connection form.

[0006] According to existing technical solutions, although the XGN type gas-insulated switchgear achieves complete electrical insulation, its relatively weak adaptability due to the high structural rigidity of the elbow joint and solid busbar makes the installation process extremely complex. It requires high precision in the machining dimensions of the high-voltage switchgear and the on-site paralleling dimensions, making it prone to stress during installation of the elbow joint and solid busbar. Furthermore, the complex and precision-required fabrication process for elbow joint cables leads to time-consuming and labor-intensive on-site installation. For schemes requiring multiple cable inlets and outlets, the cabinet depth must be increased during the design phase. If additional cable connections are subsequently added on-site, the cabinet must be replaced (by modifying the cabinet depth) to meet the usage requirements, resulting in inconvenience in power supply.

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

[0008] To address the aforementioned technical problems of existing solutions, this utility model, through innovative research and design, combines the advantages of conventional gas-insulated switchgear and air-insulated switchgear to propose a novel gas-insulated semi-insulated high-voltage switchgear. The technical solution adopted by this utility model is as follows:

[0009] A gas-insulated semi-insulated high-voltage switchgear includes a rectangular cabinet frame. Inside the cabinet frame, from top to bottom, are a busbar compartment, a gas chamber, and a cable compartment. At the front end of the cabinet frame, from top to bottom, are an instrument compartment, a mechanism compartment, and a front cable compartment. The gas chamber is a six-sided stainless steel sealed enclosure. A maintenance opening is provided on the rear cover of the gas chamber, and a rear sealing plate is installed corresponding to the maintenance opening. An explosion-proof through hole is provided at the center of the rear sealing plate, and an explosion-proof sheet is installed at the explosion-proof through hole. A connection opening connecting to the mechanism compartment is provided on the front cover of the gas chamber, and a front sealing plate is installed corresponding to the connection opening. Post insulators, three-position mechanism conductive components, and circuit breaker poles are installed inside the gas chamber. The three-position operating mechanism, the gas filling port, and the circuit breaker operating mechanism are installed inside the mechanism compartment. The gas filling port is sealed and connected to the gas chamber, and the gas chamber is filled with insulating gas.

[0010] Preferably, the busbar compartment includes a busbar compartment upper cover plate and a busbar compartment rear cover plate that are fixedly connected.

[0011] Preferably, a busbar chamber pressure relief cover is installed by opening a hole in the upper cover plate of the busbar chamber.

[0012] Preferably, busbar insulator one and busbar insulator two are respectively installed on the upper cover plate and lower cover plate of the gas box by screws. Busbar insulator one and busbar insulator two include an integrally formed pointed end and a cylindrical end. The pointed ends of busbar insulator one and busbar insulator two are located in the gas box, and the cylindrical ends of busbar insulator one and busbar insulator two penetrate the upper cover plate and the lower cover plate of the gas box and extend into the busbar chamber and the cable chamber, respectively.

[0013] Preferably, a sealing ring 1 is installed at the connection between busbar insulator 1 and the upper cover plate of the gas box, and a sealing ring 4 is installed at the connection between busbar insulator 2 and the lower cover plate of the gas box.

[0014] Preferably, the air inlet is connected to a sealed channel, a three-way pipe connector is installed on the sealed channel, a pressure gauge connector is installed on the three-way pipe connector, and the pressure gauge connector is connected to a pressure gauge.

[0015] Preferably, the inner end of the sealed channel is connected to an adapter, which is fixedly installed on the outer surface of the front sealing plate of the air box and communicates with the connection opening on the air box. A sealing ring 7 is provided between the adapter and the front sealing plate of the air box. A switch copper connector is also provided on the long sealed channel, which is located between the adapter and the tee pipe connector.

[0016] Preferably, the front side of the cabinet frame is provided with three front sealing panels with opening and closing structures from top to bottom: cabinet front sealing panel one, cabinet front sealing panel two, and cabinet front sealing panel three. The rear side of the cabinet frame is provided with three rear sealing panels from top to bottom: cabinet rear sealing panel one, cabinet rear sealing panel two, and cabinet rear sealing panel three. The top and bottom of the cabinet frame are respectively provided with cabinet upper sealing panel and cabinet lower sealing panel, and the cabinet lower sealing panel is provided with cable holes.

[0017] Preferably, the rear panel of the cabinet is a detachable structure and has heat dissipation holes.

[0018] Preferably, the current transformer is installed in the cable compartment.

[0019] The beneficial effects of this utility model are:

[0020] This utility model of a gas-insulated semi-insulated high-voltage switchgear avoids the impact of complex on-site environments on circuit breaker functionality, ensuring the safety of electrical equipment. It also minimizes operational difficulties within limited space and allows for easy increases in the number of cable connections. The main busbar and cables utilize copper busbar air insulation, solving the problem of difficult parallel installation of fully insulated gas-insulated switchgear and facilitating on-site installation, inspection, and maintenance. A sealed gas chamber filled with insulating gas improves the working environment of core components such as the circuit breaker and three-position mechanism, making them more reliable and safer, and enabling maintenance-free operation of core components. It also meets the growing demand for smaller cabinet dimensions. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 Here are structural diagrams of two existing high-voltage switchgear models. Figure 1 The model number for part 1a is KYN28-12. Figure 1 The model number for part 1b is XGN-12;

[0023] Figure 2 This is a front view of an embodiment of the gas-insulated semi-insulated high-voltage switchgear.

[0024] Figure 3 This is a right view of an embodiment of the gas-insulated semi-insulated high-voltage switchgear of this utility model;

[0025] Figure 4 This is a rear view of an inflatable semi-insulated high-voltage switchgear according to an embodiment of the present utility model.

[0026] Figure 5 for Figure 3 A magnified view of a portion of the air box;

[0027] Figure 6 for Figure 5 A magnified view of a section of the busbar insulator;

[0028] Figure 7 for Figure 5 A magnified view of the air inlet in the middle;

[0029] Figure 8 for Figure 3 A view in direction AA;

[0030] In the diagram, 1-Busbar compartment, 2-Busbar compartment pressure relief cover, 3-Busbar insulator one, 4-Gas box top cover, 5-Gas box, 6-Gas box rear sealing plate, 7-Explosion-proof sheet, 8-Post insulator, 9-Three-position mechanism conductive component, 10-Circuit breaker pole, 11-Busbar insulator two, 12-Cable compartment, 13-Current transformer, 14-Gas box bottom plate, 15-Front cable compartment, 16-Mechanism compartment, 17-Circuit breaker operating mechanism, 18-Insulation port, 19-Three-position operating mechanism, 20-Instrument compartment, 21-Front sealing plate one of the cabinet. 22 - Cabinet front sealing plate three; 23 - Cabinet rear sealing plate one; 24 - Cabinet rear sealing plate two; 25 - Cabinet rear sealing plate three; 26 - Sealing ring one; 27 - Sealing ring two; 28 - Sealing ring three; 29 - Sealing ring four; 30 - Sealing ring five; 31 - Air box front cover plate; 32 - Air box front sealing plate; 33 - Pressure gauge connector; 34 - Air box rear cover plate; 35 - Three-position connecting rod; 36 - Adapter; 37 - On / off copper connector; 38 - Cable hole; 39 - Cabinet front sealing plate two; 40 - Busbar compartment top cover plate; 41 - Busbar compartment rear cover plate. Detailed Implementation

[0031] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0032] like Figure 2-8 As shown, a novel gas-insulated semi-insulated high-voltage switchgear includes a rectangular cabinet frame. From top to bottom, the front of the cabinet frame is provided with a front sealing plate 21, a second front sealing plate 39, and a third front sealing plate 22, which have opening and closing structures. From top to bottom, the rear of the cabinet frame is provided with a rear sealing plate 23, a second rear sealing plate 24, and a third rear sealing plate 25.

[0033] The high-voltage switchgear cabinet frame contains, from top to bottom, a busbar compartment 1, a gas box 5, and a cable compartment 12 in the middle. At the front end of the cabinet frame, from top to bottom, are an instrument compartment 20, a mechanism compartment 16, and a front cable compartment 15. Typically, two or more high-voltage switchgear cabinets are assembled side-by-side. The busbar compartment 1 is an L-shaped metal channel composed of a top cover plate 40 and a rear cover plate 41. The left and right sides of the busbar compartment 1 of the high-voltage switchgear cabinet in the middle are open, facilitating the interconnection of busbars between two or more high-voltage switchgear cabinets. Only the outer sides of the busbar compartment 1 of the high-voltage switchgear cabinets at the two outer ends are sealed with side cover plates. The main busbar in busbar compartment 1 is connected to the power grid side. The main busbar is air-insulated and consists of three phases: A (yellow), B (green), and C (red). Each phase is bolted to a corresponding busbar insulator 3. The main busbars are arranged horizontally inside the independent busbar compartment 1 with phase A at the back, phase B in the middle, and phase C at the front (i.e., far / middle / near). The main busbars are connected via a copper busbar overlapping structure, ensuring safety and convenience. The rear cover plate 41 of busbar compartment 1 corresponds to the rear sealing plate 23 of the cabinet. The rear sealing plate 23 is detachable and has ventilation holes. The front of busbar compartment 1 connects to the instrument compartment 20. The rear cover plate 41 has an inspection hole. Removing the rear sealing plate 23 provides suitable operating space for the installation and maintenance of the main busbars, making on-site operation and maintenance of the main busbars more convenient and safe.

[0034] The busbar compartment 1 has an opening on the busbar compartment cover plate 40 at the top, which is equipped with a busbar compartment pressure relief cover 2. When the main busbar experiences extreme power failures such as short circuits, high-temperature and high-pressure gas will be generated in the busbar compartment 1. In severe cases, if there is no pressure relief channel, the busbar compartment 1 may explode, causing metal structural parts to scatter and potentially injuring maintenance personnel. By using the busbar compartment pressure relief cover 2 to relieve pressure, safe pressure relief can be achieved, thereby ensuring the integrity of the cabinet and preventing secondary injuries from accidents.

[0035] The gas box 5 is a stainless steel sealed box, which is composed of six stainless steel cover plates welded together: an upper cover plate 4, a lower cover plate 14, a rear cover plate 34, a front cover plate 31, a left cover plate, and a right cover plate. Busbar insulator 1 3 and busbar insulator 2 11 are respectively fixed to the upper cover plate 4 and the lower cover plate 14 of the gas box by screws. Busbar insulator 1 3 and busbar insulator 2 11 include an integrally formed pointed end and a cylindrical end. The pointed ends of busbar insulator 1 3 and busbar insulator 2 11 are located inside the gas box 5, while the cylindrical ends of busbar insulator 1 3 and busbar insulator 2 11 penetrate the upper cover plate 4 and the lower cover plate 14 of the gas box and extend into the busbar chamber 1 and the cable chamber 12, respectively. A sealing ring 26 is installed at the connection between busbar insulator 11 and the upper cover plate 4 of the gas box, and a sealing ring 29 is installed at the connection between busbar insulator 21 and the lower cover plate 14 of the gas box. The sealing effect is achieved by using sealing ring 26 and sealing ring 29. Busbar insulator 11 is connected to the post insulator 8 inside the gas box 5 and is fixedly connected to each phase branch busbar. The post insulator 8 is fixed on the mounting 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. Busbar insulator 21 is connected to the circuit breaker pole 10 inside the gas box 5 and is fixedly connected to each phase branch busbar. 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 post insulator 8. The post insulator 8 and the circuit breaker pole 10 are fixedly connected by the conductive component 9 of the three-position mechanism.

[0036] An inspection opening is provided on the rear cover plate 34 of the air box. A rear sealing plate 6 is installed on the outer surface of the rear cover plate 34 at a position corresponding to the inspection opening. The rear sealing plate 6 is connected and fixed by welding screws and mounting nuts on the outer surface of the rear cover plate 34. A second sealing ring 27 is embedded between the rear sealing plate 6 and the rear cover plate 34. A connection opening communicating with the mechanism chamber 16 is provided on the front cover plate 31 of the air box. A front sealing plate 32 is installed on the outer surface of the front cover plate 31 at a position corresponding to the connection opening. A fifth sealing ring 35 is embedded between the front sealing plate 32 and the front cover plate 31. A sealing effect is achieved by using the second sealing ring 27 and the fifth sealing ring 35. An explosion-proof through hole is made at the center of the rear sealing plate 6 of the gas box. The explosion-proof disc 7 is fixedly installed at the explosion-proof through hole on the outer surface of the rear sealing plate 6 of the gas box. The explosion-proof disc 7 is fixedly installed on the rear sealing plate 6 of the gas box with countersunk thread holes by bolts. The explosion-proof disc 7 uses the breakage of the diaphragm to relieve pressure. It can burst and release pressure under the specified temperature and pressure.

[0037] The mechanism chamber 16 is equipped with a three-position operating mechanism 19, an air inlet 18, and a circuit breaker operating mechanism 17, arranged sequentially from top to bottom. The circuit breaker operating mechanism 17 is fixed to the outer surface of the front cover plate 32 of the gas box by screws. A sealing ring is provided between the circuit breaker operating mechanism 17 and the front cover 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 through the front cover plate 32 of the gas box, and is mechanically connected to each other. The outer end of the air inlet 18 protrudes from the front cover plate 39 of the cabinet. The air inlet 18 is a pin-type finished part. After connecting the air inlet 18 through the air inflation device, the pin is pushed in to inflate the gas. The inner end of the inflation port 18 connects to the outer end of an extended sealed channel. A tee connector is installed on the extended sealed channel, and a pressure gauge connector 33 is installed on the tee connector. The pressure gauge connector 33 is led out through an upward and backward inclined bend and connected to a pressure gauge installed on the front sealing plate 39 of the cabinet. The pressure gauge allows for a direct view of the pressure in the air box 5. The inner end of the extended sealed channel connects to an adapter 36, which is fixedly installed on the outer surface of the rear sealing plate 32 of the air box and communicates with the connection opening on the air box 5. A sealing ring 7 is provided between the adapter 36 and the rear sealing plate 32 of the air box to achieve a sealing effect. A switchable copper connector 37 is also provided on the extended sealed channel. The switchable copper connector 37 is located between the adapter 36 and the tee connector. The switchable copper connector 37 is similar to a faucet with a switch function. The switchable copper connector 37, in conjunction with the inflation port 18, can achieve double insurance for inflation. One end of the three-position connecting rod 35 is fixedly installed on the outer surface of the front sealing plate 32 of the air box. The three-position operating mechanism 19 is fixedly installed 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. A sealing ring 28 is provided 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 connecting opening on the front cover plate 31 of the air box and through the front sealing plate 32 of the air box, and is mechanically connected to each other.

[0038] By setting sealing rings at various connection points, the external connection function is ensured to be unrestricted, while the air box 5 is enclosed to ensure the pressure holding effect of the slightly positive pressure gas.

[0039] The cable compartment 12 is sealed into a single chamber structure by the left and right sealing plates. Current transformers 13 are located within the cable compartment 12, with three current transformers 13 fixed to the right sealing plate in a rear-middle-front configuration. The current transformers 13 are fixedly connected to the busbar insulators 11 for each phase branch busbar. The cable compartment 12 serves as the cable entry and exit channel, employing air insulation, and is arranged with phase A at the rear, phase B in the middle, and phase C at the front. The cable compartment 12 uses a pre-reserved lap joint plate design, with the A, B, and C phase branch busbars arranged in a rear-middle-front sequence. Utilizing the crimped copper terminal structure, multiple cold-shrink cable terminals can be simultaneously lapped, facilitating on-site installation and improving construction efficiency.

[0040] The busbar compartment side cover, cable compartment left cover, and cable compartment right cover are equipped with reinforcing ribs to improve the mechanical strength of the cabinet. The top and bottom of the cabinet frame are respectively equipped with an upper cover and a lower cover, forming a complete high-voltage switchgear cabinet. The cover plates are equipped with necessary interfaces and several ventilation holes. A cable hole 38 is provided on the lower cover plate.

[0041] The gas-insulated semi-insulated high-voltage switchgear provided in this embodiment achieves communication between the internal branch busbars of the gas box 5 and the external main busbars of the busbar compartment 1 through the intermediate conductor of busbar insulator 11. The busbar compartment 1, referencing the main busbar connection method of air-insulated switchgear, is innovatively designed as an independent compartment, thus enabling the busbar compartment 1 to operate with only the main busbars inside. Communication between the internal branch busbars of the gas box 5 and the external branch busbars in the cable compartment 12 is achieved through the intermediate conductor of busbar insulator 21. Cable splicing adopts the KYN28-12 switchgear pre-reserved splice plate form. Cables on the load side or incoming side pass through the cable hole 38 at the bottom of the cabinet. A pagoda-shaped rubber ring is used at the connection point to protect and seal the cable outer shell. Furthermore, by fabricating cold-shrink cable terminals on-site, they are fixed to the pre-reserved splice plate and the copper terminals of the cold-shrink cable terminals with bolts, allowing for multiple cable entry and exit configurations. On-site installation is simple and highly operable. This mature and reliable technology has been consistently used in KYN28 and KYN61 switchgear. While meeting air clearance requirements, it effectively ensures the stable and safe operation of electrical equipment. Core components such as the circuit breaker pole 10 and the three-position mechanism conductive element 9 are housed within a sealed gas chamber 5. A slightly positive pressure of insulating gas such as N2 or SF6 is introduced into the gas chamber 5 through the inflation port 18, ensuring safe operation of the equipment under high-voltage conditions and achieving maintenance-free operation of the internal components. Simultaneously, the three-position mechanism conductive element 9 is integrally cast and forged, possessing excellent electric field performance. The rear sealing plate 6 of the gas chamber serves as a maintenance channel and installation channel for internal components, while the explosion-proof plate 7 provides a pressure relief channel for the gas chamber 5 in case of an internal arcing accident, releasing pressure through the explosion-proof plate 7 and reducing cabinet damage. In addition, the issue of the cabinet size of the air-insulated switchgear was also resolved. The circuit breaker pole 10 is equipped with a three-station mechanism and the conductive component 9 is custom-molded. Through precise dimensional calculations and verification simulations, the reasonable spatial layout has enabled the miniaturization of the cabinet, which can reduce the cabinet width to 600mm, which is basically the same as the size of the XGN-12 fully insulated gas-filled switchgear. This can effectively save floor space and has a strong technical advantage in prefabricated cabins and areas with high land costs.

[0042] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0043] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. An inflatable semi-insulated high-voltage switchgear, comprising a rectangular cabinet frame, characterized in that, The cabinet frame has a busbar compartment, gas box, and cable compartment arranged from top to bottom in the middle. The front of the cabinet frame has an instrument compartment, mechanism compartment, and front cable compartment arranged from top to bottom. The gas box is a six-sided stainless steel sealed box. An inspection opening is provided on the rear cover of the gas box, and a rear sealing plate is installed at the corresponding position. An explosion-proof through hole is opened at the center of the rear sealing plate, and an explosion-proof sheet is installed at the explosion-proof through hole. A connection opening connecting to the mechanism compartment is provided on the front cover of the gas box, and a front sealing plate is installed at the corresponding position. The post insulator, the three-position mechanism conductive parts, and the circuit breaker pole are installed inside the gas box. The three-position operating mechanism, the air inlet, and the circuit breaker operating mechanism are installed inside the mechanism compartment. The air inlet is sealed and connected to the gas box, which is filled with insulating gas.

2. The gas-insulated semi-insulated high-voltage switchgear according to claim 1, characterized in that, The busbar compartment includes a fixedly connected upper cover plate and a rear cover plate.

3. The gas-insulated semi-insulated high-voltage switchgear according to claim 2, characterized in that, The busbar chamber pressure relief cover is installed by making a hole in the upper cover plate.

4. The gas-insulated semi-insulated high-voltage switchgear according to claim 1, characterized in that, Busbar insulator one and busbar insulator two are respectively installed on the upper cover plate and lower cover plate of the gas box by screws. Busbar insulator one and busbar insulator two include an integrally formed pointed end and a cylindrical end. The pointed ends of busbar insulator one and busbar insulator two are located in the gas box, and the cylindrical ends of busbar insulator one and busbar insulator two penetrate the upper cover plate and the lower cover plate of the gas box and extend into the busbar chamber and the cable chamber, respectively.

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

6. The gas-insulated semi-insulated high-voltage switchgear according to claim 1, characterized in that, The air inlet is connected to a sealed channel, a three-way pipe connector is installed on the sealed channel, a pressure gauge connector is installed on the three-way pipe connector, and a pressure gauge is connected to the pressure gauge connector.

7. The gas-insulated semi-insulated high-voltage switchgear according to claim 6, characterized in that, An adapter is connected to the inner end of the sealed channel. The adapter is fixedly installed on the outer surface of the front sealing plate of the air box and communicates with the connection opening on the air box. A sealing ring seven is set between the adapter and the front sealing plate of the air box. A through copper connector is also set on the long sealed channel. The through copper connector is located between the adapter and the tee pipe connector.

8. The gas-insulated semi-insulated high-voltage switchgear according to claim 1, characterized in that, The front side of the cabinet frame has three front sealing panels with opening and closing structures, arranged from top to bottom: cabinet front sealing panel one, cabinet front sealing panel two, and cabinet front sealing panel three. The rear side of the cabinet frame has three rear sealing panels, arranged from top to bottom: cabinet rear sealing panel one, cabinet rear sealing panel two, and cabinet rear sealing panel three. The top and bottom of the cabinet frame are respectively equipped with cabinet upper sealing panel and cabinet lower sealing panel. Cable holes are opened on the cabinet lower sealing panel.

9. The gas-insulated semi-insulated high-voltage switchgear according to claim 8, characterized in that, The rear panel of the cabinet is a detachable structure and has ventilation holes.

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

Images