Improved compact gas-insulated metal-enclosed switch cabinet gas tank and method

Abstract

The invention belongs to the technical field of switch cabinets, and discloses an improved compact gas-insulated metal-enclosed switch cabinet gas tank and a method. The gas tank comprises a top expansion bus area which is vertically connected to a switch function area right below a copper bar bus system through the copper bar bus system arranged in a cabinet body and is used for collecting and distributing main loop current and completing conduction of a main loop; the switch function area is used for adapting to the installation space constraint right below the top expansion bus area through an integrated middle guide sleeve structure in an optimized three-position switch, and is used for ensuring the dynamic thermal stability of the conductive fastening part of the conductive switching copper bar through an improved isolation static knife holder of the three-position switch; the improved isolation static knife holder comprises an improved moving contact butt joint cylinder which is integrally cast and is provided with a circular hole type structure. And a cable outlet area. According to the invention, on-site treatment and replacement of a single cabinet can be carried out without moving all the cabinets on the two sides away, so that operation and maintenance are more convenient.

Description

Technical Field

[0001] This invention belongs to the field of switchgear technology, and particularly relates to an improved compact gas-insulated metal-enclosed switchgear gas box and method. Background Technology

[0002] Gas-insulated metal-enclosed environmentally friendly switchgear (C-GIS) has been widely used in medium-voltage power distribution networks due to its high reliability, miniaturization, and maintenance-free operation. Currently, most 500mm wide C-GIS products on the market employ lateral expansion (side-expansion) busbar connections to enable busbar expansion and cabinet paralleling.

[0003] The main disadvantages of existing technology (side-expansion type): The internal structure is complex and the space utilization rate is low: the side expansion busbar requires a large number of right-angle bent copper busbars, insulation support components and connecting parts to be arranged inside the gas box, which occupies a lot of valuable space inside the gas box, resulting in a crowded internal layout of the gas box, which is not conducive to insulation design and miniaturization.

[0004] High material costs and complicated processes: The side expansion method requires a large number of copper busbars with complex shapes and increased lengths, as well as a large number of bolt connection points and insulation wrapping, which significantly increases the cost of raw materials and processing and assembly time.

[0005] Installation and maintenance are inconvenient: The complex internal wiring and high density of connection points make the installation process inside the cabinet demanding, and the docking is difficult when merging cabinets on site. The accessibility for later inspection and maintenance is poor. If a problem occurs in a single cabinet after merging, both cabinets on both sides need to be moved (the bus connectors need to be removed) before the single cabinet can be handled and replaced on site. However, the top expansion only requires removing the bus connectors on the top, and the cabinet can be replaced without moving other cabinets.

[0006] High dependence on core components: Some manufacturers' three-position switches (isolation / grounding switches) rely on external technologies or standard parts, with insufficient integration and independent optimization, making it difficult to achieve optimal matching with the cabinet structure to achieve the ultimate compression of the overall size. Summary of the Invention

[0007] To overcome the problems existing in related technologies, the present invention discloses an improved compact gas-insulated metal-enclosed switchgear gas box and method, specifically involving a compact gas-insulated metal-enclosed switchgear gas box (C-GIS) based on a top-expanded busbar and its three-position switch.

[0008] The technical solution is as follows: An improved compact gas-insulated metal-enclosed switchgear gas box, which adopts a vertical three-layer compact layout and an internal three-layer vertical functional partition structure, from top to bottom as follows: The top expansion busbar area is located in the upper part of the cabinet. The vertical conductive transfer copper busbar of the built-in copper busbar system is directly connected vertically downward to the switch function area after being connected to the insulating sleeve above, forming the shortest vertical conductive path of the main circuit. At the same time, it is used for the collection and distribution of the main circuit current to complete the conduction of the main circuit. The switch function area, located in the middle section of the cabinet, includes a three-position switch arranged parallel to the vertical conductive path. This three-position switch adopts an improved isolating stationary knife seat with an integral casting and a round hole structure. It is connected to the vertical conductive adapter copper bus bolt through the round hole structure of the improved isolating stationary knife seat with a round hole structure. The three-position switch is integrally cast with an L-shaped support strip by eliminating the intermediate guide sleeve connected to the concentric cylinder thread. After eliminating the concentric cylinder, it is connected to and concentric with the improved grounding stationary knife seat after eliminating the grounding stationary knife seat thread. The cable exit area is located in the lower part of the cabinet. Its lower cable exit sleeve interface is fixedly connected to the switch function area through the mounting base under the integrated intermediate guide sleeve. As the cable exit connection layer, it is used to install cable connectors and current transformers. The cable exit is independently detachable, which is convenient for maintenance without affecting the upper function area.

[0009] Furthermore, the copper busbar system includes a top expansion busbar connection part installed on the inner side of the top of the gas box for realizing electrical connection between adjacent cabinets, so that the expansion direction of the main busbar between cabinets is a straight line direction perpendicular to the top surface of the cabinet; The top expansion busbar connection includes a vertical conductive transition copper busbar, which has a vertically bent structure.

[0010] The horizontal busbar section of the vertical conductive transition copper busbar is connected to the outgoing bushing. The tail end of the vertical feeder section of the vertical conductive transition copper busbar connecting the top expansion busbar area and the switch function area has a copper busbar elongated hole.

[0011] The copper busbar of the vertical conductive adapter is connected to the circular hole structure of the improved isolation stationary knife holder with a circular hole structure.

[0012] The intermediate guide sleeve that is connected to the concentric cylinder is disconnected from the T-shaped threaded rod after the concentric cylinder is disconnected. The T-shaped threaded rod is connected to the improved grounding stationary knife seat after the grounding stationary knife seat thread that is disconnected from the concentric cylinder is disconnected. A compact moving contact is also installed on the right end of the intermediate guide sleeve that is disconnected from the concentric cylinder. Adjust the position of the integrated structure of the intermediate guide sleeve that is disconnected from the concentric cylinder and the L-shaped support row to align with the pole post mounting hole, and tighten the mounting bolts.

[0013] Furthermore, the pole is mounted on the vacuum circuit breaker mechanism, which is mounted on the front panel of the cabinet.

[0014] The total height of the cabinet is 865mm.

[0015] The cable exit area includes a lower copper busbar connected to the pole, and the lower copper busbar is connected to the lower bushing.

[0016] Another object of the present invention is to provide an improved on / off control method for the gas box of a compact gas-insulated metal-enclosed switchgear, the method comprising: First, the normal power supply and operation phase; (a) In the top expansion busbar area, electrical energy is introduced into the cabinet through the top outgoing bushing and copper busbar system, and then transmitted to the switch function area in the middle of the cabinet through the vertical conductive transfer copper busbar of the copper busbar system. (b) The switch function area executes the three-position switch to the isolated closed position, the circuit is connected, and executes the vacuum circuit breaker mechanism to the closed position, the main circuit is connected; (c) After being controlled by the switch in the switch function area, the electrical energy is delivered to the outlet end of the lower outlet bushing in the cable outlet area for use by the user load; the lower outlet bushing supports user-side wiring. Second, the power outage maintenance operation phase; When a power outage is required for maintenance work, the operating procedure is as follows: (i) When the vacuum circuit breaker mechanism is opened, the vacuum circuit breaker mechanism in the switch function area is first switched to the open position to cut off the main circuit current and achieve electrical isolation. (ii) Three-position switch operation: switch the three-position switch to the open position to achieve physical isolation; Then switch the three-position switch to the closed position to ground the circuit; (iii) After the grounding is completed, close the vacuum circuit breaker mechanism again to further confirm that the system is in a safe maintenance state; (iv) During maintenance, the system is isolated from the power supply of adjacent cabinets and is electrically connected to adjacent cabinets through the top expansion bus area.

[0017] Combining all the above technical solutions, the beneficial effects of this invention are as follows: This invention provides a novel 500mm wide C-GIS cabinet that achieves comprehensive compactness in three dimensions: while ensuring rated parameters (12kV, 1250A, 12.5kA), not only is the cabinet width locked at 500mm, but the cabinet height is also effectively reduced, thus achieving a reduction in overall volume.

[0018] Fundamentally simplifying the internal structure: By changing the direction of busbar extension, the number, types and connection points of conductors inside the gas box are greatly reduced, making the main circuit structure extremely simple and reliable.

[0019] Significantly reduce overall costs: Reduce copper usage, simplify insulation structure, and reduce processing and assembly complexity, thereby gaining dual advantages in manufacturing and installation costs.

[0020] Achieving deep collaborative design between core components and structure: The core component (three-position switch) is designed entirely independently, making it highly compatible with the top expansion bus structure, achieving the optimal balance of performance, size and cost at the system level.

[0021] Compact size: While meeting the highest national standard electrical parameters, it achieves a combination of 500mm cabinet width and lower cabinet height, minimizing the overall size and saving substation floor space. It is especially suitable for space-constrained occasions, such as urban basements and renovation projects.

[0022] The main circuit has extremely high reliability: the number of internal conductor connection points has been drastically reduced, and all connections are made using simple and reliable straight or vertically bent copper busbars, which completely eliminates the potential heat generation and assembly hazards caused by complex connection points in the side expansion scheme, and significantly improves the reliability of the electrical circuit.

[0023] The cost advantage is extremely prominent: the amount of copper busbars used is greatly reduced, the structural components are simplified, and the assembly time is shortened, which gives the product a significant manufacturing cost advantage in all aspects such as raw materials, processing, and labor, making it highly competitive in the market.

[0024] Revolutionary improvement in production and installation efficiency: The modular and stacked design facilitates pre-assembly on factory assembly lines. On-site cabinet merging only requires a simple and intuitive straight-line connection at the top, improving installation efficiency by more than 50% and reducing the skill requirements for workers. If a problem occurs with a single cabinet after merging, it is not necessary to remove both sides of the cabinet for on-site handling and replacement, making operation and maintenance more convenient. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure; Figure 1 This is a schematic diagram of a traditional side-expanding cabinet. Figure 2 This is a schematic diagram of a moving contact docking cylinder with a vertically forked elongated hole, using traditional technology. Figure 3 This is a schematic diagram of the connection between the intermediate guide sleeve and the lower connecting support row using bolts in traditional technology. Figure 4 A schematic diagram of a traditional cabinet with concentric cylinders; Figure 5 A schematic diagram of the partitioned structure of the gas box in an improved compact gas-insulated metal-enclosed switchgear; Figure 6 A schematic diagram of the top outgoing bushing of the gas box for an improved compact gas-insulated metal-enclosed switchgear; Figure 7This is a schematic diagram of the connection method between the elongated hole of the copper busbar for vertical conduction and the integrated cast structure with a circular hole in the switch functional area of ​​the present invention. Figure 8 This is a side view of the integrated intermediate guide sleeve structure in the optimized three-position switch of the present invention. Figure 9 This is a front view of the integrated intermediate guide sleeve structure in the optimized three-position switch of the present invention; Figure 10 A schematic diagram showing the overall height of the gas box and the cable exit area of ​​the improved compact gas-insulated metal-enclosed switchgear; Figure 11 This is a schematic diagram of the present invention without the concentric cylinder; Figure 12 This is a schematic diagram of the grounding stationary knife holder component of the present invention; Figure 13 This is a schematic diagram of the integrated L-shaped support row and intermediate guide sleeve, which eliminates the threaded connection between the concentric cylinder and the central cylinder in this invention. In the diagram: 1. Side-expanded cabinet shell; 2. Main circuit; 3. Horizontal connecting copper busbar; 4. Vertical conductive adapter copper busbar; 5. Connecting hole; 6. Supporting insulator; 7. Vertical fork-type elongated hole component; 8. Moving contact mating cylinder; 9. Intermediate guide sleeve; 10. Moving contact; 11. Connecting support bar; 12. Pole post; 13. Circuit breaker mechanism; 14. Incoming copper busbar; 15. Incoming terminal; 16. Top-expanded busbar area; 17. Cabinet; 18. Grounding stationary knife seat thread; 19. Switch functional area; 20. Improvement 21. Isolation stationary knife holder; 22. Thread for connecting concentric cylinders; 23. Concentric cylinder; 24. Cable exit area; 25. Upper exit sleeve; 26. Long oval hole for copper busbar; 27. Grounding stationary knife holder; 28. L-shaped support busbar; 29. ​​Improved grounding stationary knife holder; 30. Compact moving contact; 31. T-shaped threaded rod; 32. Vacuum circuit breaker mechanism; 33. Lower exit copper busbar; 34. Lower exit sleeve; 35. Transition copper busbar for conventional vertical conduction; 36. Round hole structure; 37. Conventional intermediate guide sleeve. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] The innovation of this invention lies in its systematic solution to the insulation and stability challenges posed by a reduced cabinet height through a compact three-layer vertical layout and integrated collaborative design of key components. Specifically, the integrally cast intermediate guide sleeve 9 ensures switch movement accuracy while eliminating the need for traditional concentric cylinders and related precision threading due to its inherent concentricity advantage, significantly reducing processing and manufacturing costs. The improved isolating stationary knife holder 20 enhances the dynamic and thermal stability of the main circuit 2 connection and reduces the number of copper busbars required for connection from the traditional 12 to 6, greatly reducing material costs and improving assembly efficiency. This solution achieves multiple objectives: performance improvement, space saving, and cost optimization.

[0028] Example 1, such as Figure 1 The traditional side-expanding cabinet includes a side-expanding cabinet shell 1, a main circuit 2 installed in the upper part of the side-expanding cabinet shell 1, a horizontal connecting copper busbar 3 installed on the main circuit 2, a traditional vertical conductive adapter copper busbar 34 connected to the horizontal connecting copper busbar 3, and a connection hole 5 opened on the traditional vertical conductive adapter copper busbar 34. A supporting insulator 6 is installed on the rear plate in the middle of the side-expanded cabinet shell 1. The front end of the supporting insulator 6 adopts an integrally cast moving contact docking cylinder 8 with a vertical forked elongated hole component 7; such as Figure 2 As shown; the moving contact docking cylinder 8 is fastened to the connecting hole 5 by bolts through the vertical fork-shaped elongated hole component 7; The technical drawback of traditional side-expansion cabinets lies in the fact that the connection between the traditional vertical conductive adapter copper busbar 34 and the moving contact docking cylinder 8 uses a vertical fork-type elongated oval hole component 7. This requires manual adjustment to find the appropriate height before the traditional vertical conductive adapter copper busbar 34 can be tightened. Furthermore, because the vertical fork-type elongated oval hole component 7 has an open notch structure, there may be potential risks during dynamic and thermal stability testing. Additionally, the tightening method between the vertical fork-type elongated oval hole component 7 and the traditional vertical conductive adapter copper busbar 34 is inconvenient for assembly.

[0029] like Figure 1 , Figure 3 As shown, a conventional intermediate guide sleeve 36 is installed on the front panel in the middle of the side expansion cabinet shell 1. The conventional intermediate guide sleeve 36 is electrically isolated and connected to the moving contact docking cylinder 8 through the moving contact 10 installed in the inner front. The conventional intermediate guide sleeve 36 is connected to the connecting support row 11 located at the bottom by bolts. like Figure 1The connecting support row 11 is connected to the lower pole column 12 by bolts. The pole column 12 is installed on the front plate of the lower part of the side expansion cabinet shell 1 and is connected to the circuit breaker mechanism 13. The pole column 12 is connected to the inlet terminal 15 through the inlet copper busbar 14. The height of the traditional side expansion cabinet is 1045.0mm. The technical defect of the traditional side expansion cabinet is that the traditional intermediate guide sleeve 36 and the connecting support row 11 are separate parts. There will be cumulative errors in processing and assembly, and it is inconvenient to manually tighten the bolts.

[0030] like Figure 4 As shown, the conventional intermediate guide sleeve 36 is connected to the concentric cylinder 22 via a thread 21 for connecting the concentric cylinder; the concentric cylinder 22 is connected via a grounding stationary knife seat thread 18 opened on the grounding stationary knife seat 26.

[0031] To address the technical shortcomings of traditional technologies, this invention makes technical improvements, such as... Figures 5-13 An improved compact gas-insulated metal-enclosed switchgear gas box is proposed, employing a vertically stacked three-layer compact layout. This design aims to address the spatial conflicts between insulation, conductivity stability, and outgoing line maintenance while minimizing the overall cabinet height. Specifically, from top to bottom, the layers are as follows: The top expansion busbar area 16 is located in the upper part of the cabinet 17. The vertical conductive transfer copper busbar 4 of the built-in copper busbar system is directly connected vertically downward to the switch function area 19 after being connected to the insulating sleeve above, forming the shortest vertical conductive path of the main circuit 2. At the same time, it is used for the collection and distribution of the current in the main circuit 2, and completes the conduction of the main circuit 2. The switch function area 19, located in the middle section of the cabinet 17, includes a three-position switch arranged parallel to the vertical conductive path. The three-position switch adopts an improved isolation stationary knife seat 20 with an integral casting and a circular hole structure 35. The improved isolation stationary knife seat 20 with a circular hole structure 35 is bolted to the vertical conductive adapter copper busbar 4. The three-position switch is integrally cast with an L-shaped support busbar 27 by eliminating the intermediate guide sleeve 9 connected to the concentric cylinder thread. After eliminating the concentric cylinder, it is connected and concentric with the improved grounding stationary knife seat 28 after eliminating the grounding stationary knife seat thread. The cable outlet area 23 is located in the lower part of the cabinet 17. Its lower outlet sleeve interface is fixedly connected to the switch function area 19 through the mounting base below the integrated intermediate guide sleeve 9. As an outlet connection layer, it is used to install cable connectors and current transformers. The outlet cable is independently detachable, which is convenient for maintenance without affecting the upper function area.

[0032] For example, the copper busbar system includes a top expansion busbar connection section located inside the top of the gas box for electrical connection between adjacent cabinets, such that the expansion direction of the main busbar between cabinets is a straight line perpendicular to the top surface of the cabinet; the top expansion busbar connection section includes a vertical conductive transition copper busbar 4, which has a vertically bent structure. The horizontal busbar section of the vertical conductive transition copper busbar 4 is connected to the upper outgoing sleeve 24, and the tail end of the vertical feeder section connecting the top expansion busbar area 16 and the switch function area 19 of the vertical conductive transition copper busbar 4 has a copper busbar elongated hole 25. The copper busbar elongated hole 25 of the vertical conductive transition copper busbar 4 is connected to the round hole structure 35 of the improved isolation stationary knife seat 20 with a round hole structure 35. The intermediate guide sleeve 9, which is disconnected from the concentric cylinder, is connected to the T-shaped threaded rod 30 after the concentric cylinder is disconnected. The T-shaped threaded rod 30 is connected to the improved grounding stationary knife seat 28 after the grounding stationary knife seat thread used for connection with the concentric cylinder is disconnected. A compact moving contact 29 is also installed on the right end of the intermediate guide sleeve 9, which is disconnected from the concentric cylinder. The position of the integrated structure of the intermediate guide sleeve 9, which is disconnected from the concentric cylinder, and the L-shaped support row 27 is adjusted to be aligned with the mounting hole of the pole post 12. The mounting bolts are then tightened.

[0033] Example 2: The technical solution of the present invention will be further described below in conjunction with specific technical features.

[0034] The top expansion busbar area 16 is located in the upper part of the cabinet 17. Its built-in copper busbar system is connected vertically downward to the switch function area 19 after being connected to the insulating bushing above, forming the shortest vertical conductive path of the main circuit 2. This optimizes the electric field distribution inside the gas box and saves height space. At the same time, this area is mainly used for the collection and distribution of the current of the main circuit 2 to complete the conductive task of the main circuit 2. The number of copper busbars used is reduced from the traditional 12 copper busbars to only 6 copper busbars for connection and conduction, which reduces costs and improves assembly efficiency. It is known that the traditional side expansion cabinet in the upper section requires 12 copper busbars for electrical connection, etc., while the present invention requires only 6, reducing the number by 6. In addition, the copper busbars are easy to process, which facilitates later assembly by personnel and reduces the processing and use costs of copper busbars.

[0035] For example, the copper busbar system includes a top expansion busbar connection part disposed on the inner side of the top of the gas box for realizing electrical connection between adjacent cabinets, such that the expansion direction of the main busbar between cabinets is a straight line direction perpendicular to the top surface of the cabinet.

[0036] The top expansion busbar connection section includes a vertical conductive transition copper busbar 4, eliminating the need for the horizontal connecting copper busbar 3 of the same type in the lower expansion cabinet, reducing the number of copper busbars used by 6. Furthermore, this vertical conductive transition copper busbar 4 is easier to manufacture and more user-friendly in terms of manufacturing errors and human assembly. This upper section directly reduces the cost of copper components by 50%-60%.

[0037] Furthermore, the vertical conductive transition copper busbar 4 has a vertical bend structure (only one 90° bend), which can ensure the processing accuracy of the vertical conductive transition copper busbar 4 and reduce the processing difficulty of the vertical conductive transition copper busbar 4. This solves the problem that the existing technology has more copper busbars of the same type of side expansion cabinet, and most of them are irregularly shaped and inconvenient to process. The present invention indirectly improves the assembly efficiency and reduces the overall cost of the cabinet.

[0038] The switch function area 19 is located in the middle section of the cabinet 17. Its core includes a three-position switch arranged parallel to the vertical conductive path. The three-position switch adopts an integrally cast central guide sleeve to adapt to the installation space constraints directly below the top expansion busbar area and to accurately guide the linear movement of the isolating switch moving contact in a compact space. At the same time, since the intermediate guide sleeve 9, which is connected to the concentric cylinder by a thread, and the lower L-shaped support row 27 are integrally cast, the concentricity between the guide sleeve and the grounding stationary knife seat can be guaranteed to a certain extent. Therefore, the concentric cylinder and its related thread processing can be eliminated, reducing processing and overall costs. An improved isolating stationary knife holder 20 with an integrated casting of a three-position switch and a circular hole structure 35 is used to ensure the dynamic and thermal stability of the conductive fastening point of the vertical conductive adapter copper busbar 4; the circular hole structure 35 of the improved isolating stationary knife holder 20 is easier to connect with the vertical conductive adapter copper busbar 4 of the upper section; the improved isolating stationary knife holder 20 with the circular hole structure 35 is fastened to the vertical conductive adapter copper busbar 4 by bolts. It can be seen that, since the intermediate guide sleeve 9, which is connected to the concentric cylinder, and the lower L-shaped support row 27 are integrated into a single design, the concentricity of the three-position switch is improved to a certain extent. Therefore, the concentric retaining sleeve between the grounding stationary knife seat and the intermediate guide sleeve 9 is removed, as is the machining of the threads used to connect the concentricity at the ends of the grounding stationary knife seat and the intermediate guide sleeve 9, which reduces the cost. The cable outlet area 23 is located in the lower part of the cabinet 17 and is bolted to the integrated intermediate guide sleeve 9 in the three-position switch. It serves as the outlet connection layer and is used to install cable connectors and current transformers.

[0039] For example, such as Figure 6 The improved compact gas-insulated metal-enclosed switchgear gas box's top expansion busbar area 16 also includes an upper outgoing bushing 24. The upper outgoing bushing 24 is aligned with the mounting holes on the top of the cabinet 17 (gas box body), a sealing ring is used to ensure sealing, and the fixing bolts are tightened evenly.

[0040] The horizontal bus section of the vertical conductive transition copper busbar 4 is connected to the upper outgoing sleeve 24. The tail end of the vertical feeder section of the vertical conductive transition copper busbar 4 connecting the top expansion busbar area 16 and the switch function area 19 has a copper busbar elongated hole 25. like Figure 7As shown, in the switch function area 19, the elongated hole 25 of the vertical conductive adapter copper busbar 4 is connected to the circular hole structure 35 of the improved isolation stationary knife holder 20, which is integrally cast and has a circular hole structure 35. The vertical conductive adapter copper busbar 4 can be fastened without manual adjustment, and the manual assembly work is simple. At the same time, since the improved isolation stationary knife holder 20 with a circular hole structure 35 adopts a circular hole structure, there is no need to worry about the safety issue of it popping open during dynamic and thermal stability tests. Overall, the connection method of the vertical conductive adapter copper busbar 4 is simple and reliable.

[0041] For example, the switch function area 19 serves as the core switching and isolation layer, where a self-designed ultra-compact three-position switch is centrally arranged, and the structural shape of the conductive fasteners connected to the upper section copper busbar is optimized to make it more rational.

[0042] Specifically, such as Figure 8 , Figure 9 As shown, in the switch function area 19, the integrated intermediate guide sleeve 9 in the optimized three-position switch includes: the intermediate guide sleeve 9, which eliminates the thread connecting to the concentric cylinder, is welded together with the L-shaped support row 27. Cancel the connection between the intermediate guide sleeve 9, which is connected to the concentric cylinder thread, and the T-shaped threaded rod 30, which is connected to the concentric cylinder 22 after cancellation (e.g.) Figure 11 The T-shaped threaded rod 30 is connected to the improved grounding stationary tool holder 28 after the removal of the concentric cylinder for connection, as shown in the example. Figure 12 The right end of the intermediate guide sleeve 9, which is connected to the concentric cylinder by a thread, is also equipped with a compact moving contact 29. Then, the intermediate guide sleeve 9, which is connected to the concentric cylinder by a thread, is adjusted (e.g., ...). Figure 13 The L-shaped support row 27 is integrated with the structure so that it is aligned with the mounting hole of the pole post 12, and the mounting bolts are tightened.

[0043] The pole 12 is mounted on the vacuum circuit breaker mechanism 31, which is mounted on the front panel of the cabinet 17.

[0044] It can be seen that the intermediate guide sleeve 9, which is connected to the concentric cylinder by a thread, is eliminated (e.g., ...). Figure 13 The L-shaped support row 27 is a welded part with small processing error and no assembly error, and it is also convenient to tighten the bolts.

[0045] Since it is a one-piece welded part, the bolts connecting the intermediate guide sleeve 9 and the L-shaped support row 27, which are connected to the concentric cylinder thread, were eliminated when the strength was sufficient, which directly reduced the processing cost. like Figure 10 The cable outlet area 23 includes a lower outlet copper busbar 32 connected to the pole post 12, and the lower outlet copper busbar 32 is connected to the lower outlet sleeve 33; As can be seen from the above technical solution, the space efficiency mechanism of this invention is as follows: This layout arranges electrical functions linearly in the vertical direction, that is, the layout of the vertical conductive connecting copper busbar 4 avoids the waste of space and materials caused by circuit intersections and avoidances in traditional designs. Each partition is basically aligned in the horizontal projection, so that the width and depth dimensions of the cabinet 17 (air box) are utilized to the maximum extent, which is the basis for achieving overall volume reduction.

[0046] The total height of the cabinet 17 (air box) of this invention is 865mm; as shown Figure 10 .

[0047] In comparison, with the same depth and width, the height of the air box in this invention is 180mm lower than that of the traditional side expansion, which truly achieves the ultimate utilization and compression of the internal space of the air box, while reducing manufacturing costs and has practical production guidance significance.

[0048] For example, the present invention achieves a deep integration of a vertical three-layer compact layout with the core structure of the switch functional area 19 through collaborative innovation; (1) Extreme space saving and reduced overall cost: In this design, the busbar area 16, switch function area 19, and outgoing line area 23 are stacked vertically, greatly reducing the vertical space required by traditional horizontal or decentralized layouts. This significantly reduces the area used by a single cabinet and the required building height. At the same time, the number of copper busbars used is reduced from the traditional 12 to only 6 for connection and conduction, reducing costs and improving assembly efficiency. Its volume advantage allows it to save valuable land resources and building costs in high-density, high-value application scenarios such as urban power grid transformation, underground substations, offshore platforms, and compact data centers, thereby reducing the user's total cost of ownership (TCO).

[0049] (2) Improved reliability and enhanced market competitiveness: The integrated cast central guide sleeve ensures the accuracy and reliability of the movement of the three-position switch moving contact within the limit space, reducing the risk of failure due to assembly errors or long-term wear. Simultaneously, since the central guide sleeve 9 and its lower L-shaped support row 27 are integrally welded, the concentricity with the grounding stationary knife seat can be guaranteed to a certain extent, thus eliminating the need for the concentric cylinder and related threading, reducing processing and overall costs. Finally, the improved design of the integrated cast and round-hole structure 35-equipped isolation stationary knife seat 20, through bolt connection with the vertical conductive adapter copper busbar 4, significantly enhances the mechanical strength and short-circuit resistance of the main circuit 2 connection point, ensuring long-term dynamic and thermal stability. These improvements directly translate into higher product reliability, a longer maintenance-free cycle, and stronger market competitiveness.

[0050] (3) Convenient operation and maintenance, enhancing the value of the entire life cycle: The modular cable outlet area design makes it possible to maintain or replace current transformers or cable heads without involving the upper busbar and switch functional area, which greatly simplifies the maintenance process, shortens the power outage time, and reduces the difficulty and cost of operation and maintenance.

[0051] (4) Promote industry upgrading: This solution provides a feasible technical reference path for the miniaturization and standardization of high voltage level (such as 40.5kV) gas-insulated switchgear, which helps to promote the development of the entire medium voltage power distribution equipment towards a more compact, intelligent and environmentally friendly direction, and has significant market competitive advantages and commercial promotion value.

[0052] In the field of gas-insulated switchgear, both domestically and internationally, miniaturization mainly focuses on optimizing the arrangement of components within a single gas chamber or adopting new insulating media. However, the industry lacks mature and efficient solutions for how to systematically and reliably achieve seamless vertical integration of the three functional modules—"top expansion busbar, core switch, and cable outgoing lines"—into a single unit. Specifically: This invention innovatively proposes a compact three-layer layout with vertical stacking, providing a clear physical framework for solving height limitations.

[0053] To address this layout, a key integrated welding design and improved isolation stationary knife holder 20 were developed for the intermediate guide sleeve 9 and L-shaped support row 27, solving the core challenge of achieving high-strength and high-stability connection between the switch precision guide and the main circuit 2 within the vertical compression space.

[0054] This invention's collaborative design paradigm of "overall layout + core components" provides the industry with a verifiable and implementable complete technical solution, filling a key gap in the transition from theoretical conception to engineering practice.

[0055] Furthermore, the power industry has long faced a contradiction: on the one hand, there is an urgent need to miniaturize and compact switchgear equipment to adapt to increasingly tight space; on the other hand, it is essential to absolutely guarantee its insulation reliability, current carrying capacity, and dynamic and thermal stability. People aspire to achieve performance without compromise or even better performance within extremely compressed dimensions, but under traditional thinking, miniaturization and compact design often come at the cost of compromised cabinet performance.

[0056] This invention successfully solves a long-standing technical problem that has plagued the industry: (1) The contradiction between insulation and size: By designing the main circuit 2 as the shortest vertical conductive path (from the busbar area 16 through the copper busbar to the switch function area 19), the electric field distribution is optimized while compressing the size, rather than simply and crudely reducing the distance, thus ensuring the insulation strength in a compact space.

[0057] (2) The contradiction between stability and space: In the most core and crowded area of ​​the switch function area 19, instead of the conventional, space-consuming split adjustable structure, an integrated cast guide sleeve was innovatively used to ensure accuracy, and a structurally reinforced and improved isolated stationary knife holder 20 was designed to cope with stress concentration under space constraints. This ensures the mechanical and electrical stability of the core functions under the most demanding space conditions.

[0058] (3) The contradiction between maintainability and integration: The cable outlet and current transformer are independent and detachable modules, which realizes good maintainability under high integration and solves the common dilemma of compact cabinets being difficult to repair.

[0059] This invention overcomes some inherent design biases in the field: (1) To ensure insulation and safety, sufficient buffer or maintenance space must be reserved between each functional area. This invention proves that through scientific insulation design (such as vertical shortest path) and electric field management, busbar area 16, switch functional area 19 and outgoing line area 23 can be safely and directly stacked longitudinally without the need for traditional physical buffer isolation strips, thus maximizing space utilization.

[0060] (2) In a compact space, complex moving parts (such as three-position switches) should adopt a split, field-adjustable structure to compensate for machining and assembly errors. However, this invention takes the opposite approach, using integrated casting for key guiding components in the most space-constrained switch functional area 19. This not only did not fail due to high precision requirements, but also achieved better motion accuracy, reliability, and consistency by reducing assembly interfaces and improving overall rigidity, while reducing the number of parts and lowering the probability of failure.

[0061] (3) For high-current connection points, the contact area should be maximized, usually by using a large-area flat contact combined with a small number of large-diameter bolts for pressing. However, this invention uses an improved isolating stationary knife holder 20 with a specific circular hole structure 35 to achieve fastening with the vertical conductive transition copper busbar 4. This design focuses more on enhancing connection rigidity and distributing stress (especially bending moment and torque) rather than simply pursuing contact area. It proves that under the special stress environment brought about by the compact layout, the structurally optimized distributed connection method can more effectively ensure dynamic and thermal stability than the traditional centralized large-area connection, achieving unexpected technical results.

[0062] For example, the ultra-compact three-position switch independently designed by the present invention has the following advantages.

[0063] Deeply customized structure: This three-position switch is a non-standard component custom-designed for the internal space of the gas box of this cabinet type. Its design breaks through the size and structural constraints of general switches. By eliminating the intermediate guide sleeve 9 connected to the concentric cylinder by welding it together with the L-shaped support row 27, the number of processed parts is reduced, and the disadvantages of similar structures, such as a large number of parts and excessive cumulative processing and assembly errors, are overcome; at the same time, the assembly accuracy is improved.

[0064] Direct integration and simplified interface: The inlet and outlet positions and connection methods of the upper outlet bushing 24 and lower outlet bushing 33 of this three-position switch are designed to match the conductive paths of the upper and lower sections in the gas box. As a structural hub, it directly connects the upper and lower sections, almost eliminating the additional transition conductors required in conventional layouts, making the box structure more compact and reliable.

[0065] In this invention, the internal conductive circuit is designed with extreme simplification: Short straight conductor principle: All vertical conductive transition copper busbars 4 (main circuit copper busbars) inside the gas box (used for conductive function) are arranged strictly according to the principle of shortest path and simplest shape. The main current path of the vertical conductive transition copper busbar 4 is mainly composed of two types of straight conductors: the horizontal busbar section of the upper section and the vertical feeder section connecting the upper and middle sections.

[0066] Minimizing the number of connection points: Thanks to the integrated design of the three-position switch and the clear boundaries of the vertical partitions, the number of mechanical connection points in the internal conductive circuit is reduced to a minimum. This not only reduces potential heat-generating risks but also significantly simplifies the assembly process. All vertical conductive transition copper busbars 4 are bent for easy processing, with only 3 connection points (compared to 6 connection points in existing technology).

[0067] Decoupling from Expansion Methods: The key to this invention lies in the fact that the vertical conductive connecting copper busbar 4 inside the gas box cabinet 17 serves only the internal circuit function of this cabinet, and is structurally decoupled from the electrical expansion connections between cabinets. Inter-cabinet connections are achieved through independent top connectors, allowing the internal circuit design to focus entirely on space optimization without reserving any structure or space for lateral expansion. This completely solves the fundamental problem of complex and cumbersome internal wiring in traditional lateral expansion schemes.

[0068] For example, the structural integration of cabinet 17 (air box body): Integrated casting or welding: The air box body can be manufactured using an integrated process, with its internal partitions, support ribs, and interfaces or pins for fixing various functional modules all integrated into a high-strength overall structure.

[0069] Synergy of insulation and airtightness: The insulation supports between functional zones also serve as mechanical support structures, achieving functional integration. This design ensures that insulating gas gaps and creepage distances are arranged and guaranteed most effectively within a compact space.

[0070] An exemplary method for assembling an improved compact gas-insulated metal-enclosed switchgear gas box includes: (a) Preparation: Before assembly, all parts must be cleaned and inspected to ensure they are free of damage and foreign objects, and the inside of the air box must be confirmed to be clean and dry.

[0071] (b) Install the upper cable outlet sleeve 24 and the lower cable outlet sleeve 33; Installation of upper cable outlet sleeve 24: Align the upper cable outlet sleeve 24 with the mounting hole on the top of the cabinet 17 (air box body), use the sealing ring to ensure sealing, and tighten the fixing bolts evenly. The torque must meet the process requirements. Installation of lower cable outlet sleeve 33: Similarly, align the lower cable outlet of the cabinet 17 (air box body), install the sealing ring and tighten it. Pay attention to keeping the lower cable outlet sleeve perpendicular to the cabinet body to avoid tilting.

[0072] (c) Install the vacuum circuit breaker mechanism 31 and pole 12; first, install the pole 12 on the aluminum plate, adjust the three-phase pole 12 to make it perpendicular to the aluminum plate, and fix it firmly. Then fix the vacuum circuit breaker mechanism 31 on the aluminum plate. When connecting the vacuum circuit breaker mechanism 31 and the pole 12, ensure that the insulating tie rod of the pole 12 and the output shaft of the vacuum circuit breaker mechanism 31 are well matched, the connecting pin is installed in place, and check whether the movement is flexible and without jamming.

[0073] (d) Install pole 12 to the front panel of cabinet 17 (air box); hoist or move the assembled pole-vacuum circuit breaker mechanism aluminum plate assembly to the front panel of the air box, align the mounting holes, and use fasteners to tighten diagonally in sequence to ensure reliable sealing between the pole and the aluminum plate, and between the aluminum plate and the front panel of the air box, and that the air tightness meets the standardized design requirements.

[0074] (e) Install the three-position switch and the upper and lower copper busbars; first, install the improved grounding stationary knife seat 28, compact moving contact 29, T-shaped threaded rod 30, etc. into the integrated intermediate guide sleeve 9 structure, and then adjust the structural position of the L-shaped support row 27 below the integrated intermediate guide sleeve 9 to align it with the mounting hole of the pole post 12, and tighten the mounting bolts. When connecting the upper vertical conductive adapter copper busbar 4, first install the improved isolation stationary knife seat 20 onto the insulator, then fix the insulating support to the rear plate of the gas box, and then place the vertical conductive adapter copper busbar 4 according to the drawing position, and use a torque wrench to tighten the connecting bolts to the specified torque to ensure reliable electrical connection and flat contact surface.

[0075] When connecting the lower copper busbar 32, first tighten the lower copper busbar 32 to the upper pole post 12 slightly, then pass the bolt through the lower copper busbar 32 and screw it into the lower lower sleeve 33. Finally, use a torque wrench to tighten the connecting bolt to the specified torque to ensure that the copper busbar lap surface is flat and the conductivity is reliable.

[0076] (f) Final inspection; After all assembly is completed, an overall inspection is carried out, including mechanism operation test, loop resistance test and airtightness test, to ensure that all assembly links meet the process and quality standards.

[0077] As can be seen, the overall assembly process of this invention is clear, the modular design facilitates step-by-step implementation, the installation process emphasizes centering and sealing control, the structural layout is reasonable, and it is convenient for subsequent maintenance and repair, reflecting the humanization of the process and the convenience of operation.

[0078] Example 3: The cabinet of this invention adopts a three-zone functional separation design, with upper, middle, and lower sections corresponding to the main busbar conduction function, core switch function, and user outgoing line function, respectively. The following details the working process of this air-cooled enclosure at different stages, based on its structural features and operating flow. The improved on / off control method for the gas box of a compact gas-insulated metal-enclosed switchgear includes: First, the normal power supply and operation phase; (a) Top expansion busbar area 16 (upper section (conductive area)): Electrical energy is introduced into the cabinet through the upper outgoing bushing and copper busbar system, and then transmitted to the switch function area 19 in the middle of the cabinet 17 via the vertical conductive transfer copper busbar 4 of the copper busbar system. This top expansion busbar area 16 is responsible for the collection and distribution of electrical energy, ensuring that the current enters the core switch area stably.

[0079] (b) Switch Function Area 19 (Middle Section (Switch Area)): The three-position switch is in the isolated closed position to ensure circuit continuity; the vacuum circuit breaker mechanism 31 is in the closed position to keep the main circuit conducting; this switch function area 19 is the core of the switch, realizing normal circuit switching control and protection.

[0080] (c) Cable outgoing area 23 (lower section (user outgoing area)): After being controlled by the switch in the switch function area 19, the electrical energy is delivered to the outgoing end of the lower outgoing bushing 33 of the cable outgoing area 23 for the user load; the lower outgoing bushing 33 supports user-side wiring and has live warning and protection functions.

[0081] Second, the power outage maintenance operation phase; When a power outage is required for maintenance work, the operating procedure is as follows: (i) Vacuum circuit breaker mechanism 31 trips: First, switch the vacuum circuit breaker mechanism 31 in the switch function area 19 to the trip position to cut off the main circuit current and achieve electrical isolation.

[0082] (ii) Operation of three-position switch: switch the three-position switch to the open position to achieve physical isolation; then switch the three-position switch to the closed position to ground the circuit, ensure maintenance safety, and prevent residual charge or accidental power supply.

[0083] (iii) Vacuum circuit breaker mechanism 31 is closed (grounding reconfirmation); After the grounding is completed, the vacuum circuit breaker mechanism 31 can be closed again. At this time, the current cannot form a circuit due to the grounding, further confirming that the system is in a safe maintenance state.

[0084] (iv) During maintenance, the system is isolated from the power supply of adjacent cabinets; this cabinet maintains electrical connection with adjacent cabinets through the top expansion bus connector; The top expansion busbar area 16 can still provide power transmission channels for adjacent cabinets, ensuring that other cabinets in the system continue to operate normally.

[0085] As can be seen from the above embodiments, the present invention has clear partitions and independent functions: the upper, middle and lower three zones respectively undertake the functions of conduction, switching and outgoing lines, which facilitates maintenance and fault location. The copper busbars are easy to assemble: a total of 12 copper busbars are installed in the upper and lower sections. The copper busbars are easy to process, which improves assembly efficiency and reduces material procurement cycle and cost.

[0086] Extremely high space utilization: The space utilization of the gas box mentioned in the design of this invention is extremely high, and the overall volume of the gas box is small, achieving a truly miniaturized design of the gas box.

[0087] This invention redefines the typical specifications for the internal space utilization of a 500mm wide C-GIS cabinet through a three-in-one design of vertical partition layout, customized core switches, and minimalist internal circuitry. Its direct effect is a significant reduction in the overall volume (especially height) of the gas box under the same or even higher electrical parameters, along with a sharp decrease in the number of internal components and assembly complexity, thereby reducing manufacturing costs and improving product reliability.

[0088] Application Example: An industrial power distribution room needs to add an outgoing circuit. Existing cabinet technologies often employ horizontal or non-standardized partitioned structures, use generic switching components, and have complex circuits. Furthermore, they are not advantageous in terms of height, have large cabinets, require hoisting equipment for installation, and involve complex internal wiring and lengthy commissioning times. However, by adopting the vertical partitioned layout, customized core switch, and minimalist internal circuit design of this invention, the overall cabinet size is lighter and thinner, making installation, replacement, and maintenance easier. Its internal copper busbar wiring is simple, and commissioning and assembly are quick and efficient. The integrated welded structure of the central guide sleeve and supporting copper busbar at the three-position switch reduces the number of parts, improving assembly efficiency and accuracy. The integrated structure also optimizes the electric field distribution, and it is predicted that a higher voltage insulation level (e.g., 12kV→24kV) can be achieved within a 500mm width. During maintenance, isolation and grounding can be completed with a single button press using the three-position switch, making operation clear and safe without affecting the operation of adjacent cabinets.

[0089] The core value of this invention lies in its spatial reconstruction, switch optimization, and circuit simplification, achieving the following within a compact 500mm cabinet width: a smaller footprint and higher space utilization, adapting to the high-density layout trend of modern power distribution rooms; higher electrical performance and reliability, stemming from customized switches and minimalist insulation structures; lower total lifecycle costs, including manufacturing, installation, operation and maintenance, and expansion costs; and a safer and more convenient operating experience, especially suitable for industrial scenarios requiring frequent maintenance and upgrades.

[0090] Therefore, this invention is not only an optimization of structural design, but also an upgrade of typical C-GIS product specifications, giving it a significant competitive advantage in the field of compact, highly reliable, and low-cost medium-voltage switchgear. Furthermore, this technical solution is not merely a partial improvement to the switchgear, but a comprehensive innovation from spatial architecture and core functional units to the system ecosystem. Its core advantages can be summarized in the following three points: A revolution in space density: Within the industry-standard 500mm cabinet width, it maximizes the power supply capacity per unit area, redefining the space efficiency benchmark for compact C-GIS.

[0091] Lifecycle cost leadership: Costs at every stage, from raw materials, manufacturing, installation to operation and maintenance, are effectively controlled, providing customers with a more competitive total cost of ownership.

[0092] Generational improvements in reliability and safety: By simplifying the design at the source and strengthening core components, the probability of failure is fundamentally reduced, and the user-friendly operating logic greatly ensures the safety of personnel and equipment.

[0093] This invention successfully transforms the focus of switchgear from functionality-oriented to user experience and overall value-oriented. It perfectly aligns with the modern power system's development trends towards miniaturized, intelligent, highly reliable, and easy-to-maintain equipment. This technology is predicted to have broad application prospects in the following areas: Urban rail transit and commercial complexes: places with extremely high requirements for space and power supply reliability.

[0094] New energy booster stations and industrial technological upgrading projects: situations where expansion or upgrading is required within existing space.

[0095] For large-scale centralized procurement projects that are cost-sensitive and require high quality: the ability to simultaneously meet the technical specifications and investment budget requirements of the bidding party.

[0096] As can be seen from the above embodiments, the present invention provides a compact gas-insulated metal-enclosed switchgear (top expansion) with model number XGN-12 / 1250-12.5. Its core innovation lies in a brand-new internal structural layout of the gas box and component integration method. This method achieves a significant improvement in space utilization, reliability and economy within a standard cabinet width of 500mm through functional reconstruction and component collaborative design.

[0097] A fundamental innovation in busbar integration: changing the busbar extension path between cabinets from a lateral detour inside the gas box to a straight line running through the top inside the gas box, which is the core innovation for resolving space conflicts.

[0098] Innovative spatial topology: Based on the top expansion busbar, a new three-dimensional layout model with vertically leading and horizontally compactly arranged functional units was created, achieving simultaneous reduction in cabinet width and height.

[0099] Targeted innovation of core components: The non-standard three-position switch designed specifically for ultra-compact top-expansion cabinet type has its size and interface as an organic part of the overall solution, rather than a simple selection, and the processing and assembly errors of the components in this part of the structure have been improved.

[0100] System-level cost and process innovation: Through the above structural innovations, the material list is simplified, the processing steps are reduced, and the installation process is simplified in a systematic way. It is a system innovation that combines structural and economic benefits.

[0101] A gas-insulated metal-enclosed switchgear, characterized in that: the cabinet has a built-in copper busbar system, which includes a top-expanding busbar connection part located inside the top of the gas box for electrical connection between adjacent cabinets, such that the expansion direction of the main busbar between cabinets is a straight line perpendicular to the top surface of the cabinet. (This is the core concept of protecting the built-in top-expanding novel small gas box.) The interior of the gas box is divided into a top-expanded busbar area, a switch function area, and a cable outlet area from top to bottom. The top-expanded busbar area is directly connected to a three-position switch in the switch function area located directly below it via a vertical conductor. This design is intended to achieve a compact and necessary specific three-dimensional layout. The three-position switch is a non-standard, independently designed module specifically for this cabinet type. While ensuring that the center distance and height of the poles remain unchanged (compared to similar side expansions), the structural design of the intermediate guide sleeve in the three-position switch has been independently optimized to adapt to the installation space constraints directly below the top expansion busbar area.

[0102] A method for constructing a compact C-GIS switchgear is characterized by: releasing the side and longitudinal space by adopting a built-in top expansion bus connection method, and using a customized miniaturized three-position switch, so that the overall volume of the cabinet with a width of 500mm is smaller than that of a side expansion cabinet with the same electrical parameters.

[0103] Example 4

[0104] In addition to the above-mentioned air-insulated top-expansion scheme for the gas box, the objective of this invention can also be achieved through the following alternative solutions: Hybrid insulation top expansion scheme: At the connection of the top expansion bus, cast solid insulation (epoxy resin) is used instead of pure gas insulation to construct local reinforced insulation, which allows for smaller gas gaps and further compresses the top space.

[0105] Combined rear and top expansion scheme: For special applications, the main busbar can be extended to the upper rear of the cabinet, which can also avoid the disadvantages of side expansion and achieve a similar simplification effect, but the flexibility of cabinet integration is slightly inferior to pure top expansion.

[0106] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0107] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An improved compact gas-insulated metal-enclosed switchgear gas box, characterized in that, The improved compact gas-insulated metal-enclosed switchgear gas box is arranged from top to bottom as follows: The top expansion busbar area (16) is located at the top of the cabinet (17). After the vertical conductive transfer copper busbar (4) of the built-in copper busbar system is connected to the insulating sleeve above, it is vertically connected to the switch function area (19) to form the vertical conductive path of the main circuit. It is used for the collection and distribution of the main circuit current and to complete the conduction of the main circuit. The switch function area (19), located in the middle of the cabinet (17), includes a three-position switch arranged parallel to the vertical conductive path. The three-position switch adopts an improved isolation stationary knife seat (20) with an integral casting and a round hole structure (35). It is bolted to the vertical conductive adapter copper busbar (4) through the round hole structure (35). The three-position switch is integrally welded to the L-shaped support row (27) by eliminating the intermediate guide sleeve (9) connected to the concentric cylinder thread, and is connected to the improved grounding stationary knife seat (28) and arranged concentrically. The cable outlet area (23) is located at the bottom of the cabinet (17). The lower outlet bushing interface is fixedly connected to the switch function area (19) through the mounting base below the integrated intermediate guide sleeve (9). It serves as the outlet connection layer for installing cable connectors and current transformers.

2. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 1, characterized in that, The copper busbar system includes a top expansion busbar connection part installed on the inner side of the top of the gas box to realize the electrical connection between adjacent cabinets, so that the expansion direction of the main busbar between cabinets is a straight line direction perpendicular to the top surface of the cabinet; The top expansion busbar connection part includes a vertical conductive transition copper busbar (4), which has a vertical bending structure.

3. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 2, characterized in that, The horizontal busbar section of the vertical conductive transition copper busbar (4) is connected to the upper outgoing bushing (24). The tail end of the vertical feeder section of the vertical conductive transition copper busbar (4) connecting the top expansion busbar area (16) and the switch function area (19) has a copper busbar elongated hole (25).

4. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 1, characterized in that, The copper busbar elongated hole (25) of the vertical conductive adapter copper busbar (4) is connected to the round hole structure (35) of the improved isolation stationary knife seat (20) with round hole structure (35).

5. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 1, characterized in that, The intermediate guide sleeve (9) is connected to the T-shaped threaded rod (30), and the T-shaped threaded rod (30) is connected to the improved grounding stationary knife seat (28). The right end of the intermediate guide sleeve (9) is also equipped with a compact moving contact (29). The position of the integrated structure of the intermediate guide sleeve (9) and the L-shaped support row (27) is adjusted to be aligned with the mounting hole of the pole post (12).

6. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 5, characterized in that, The pole (12) is mounted on the vacuum circuit breaker mechanism (31), which is mounted on the front panel of the cabinet (17).

7. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 1, characterized in that, The total height of the cabinet (17) is 865mm.

8. The improved compact gas-insulated metal-enclosed switchgear gas box according to claim 1, characterized in that, The cable outlet area (23) includes a lower outlet copper busbar (32) connected to the pole post (12), and the lower outlet copper busbar (32) is connected to the lower outlet bushing (33).

9. An improved on / off control method for the gas box of a compact gas-insulated metal-enclosed switchgear, characterized in that, This method is implemented in the gas box of the compact gas-insulated metal-enclosed switchgear improved according to any one of claims 1-8, and the method includes: First, the normal power supply and operation phase; (a) In the top expansion busbar area (16), electrical energy is introduced into the cabinet (17) through the upper outgoing bushing (24) and the copper busbar system, and then transmitted to the switch function area (19) in the middle of the cabinet (17) via the vertical conductive transfer copper busbar (4) of the copper busbar system. (b) When the switch function area (19) is in the isolated closed position, the circuit is connected, and when the vacuum circuit breaker mechanism (31) is in the closed position, the main circuit is connected; (c) After being controlled by the switch in the switch function area (19), the electrical energy is delivered to the outlet end of the lower outlet bushing (33) in the cable outlet area (23) for use by the user load; the lower outlet bushing (33) supports the user side wiring. The second phase is the power outage maintenance operation phase.

10. The improved on / off control method for the gas box of a compact gas-insulated metal-enclosed switchgear according to claim 9, characterized in that, During the power outage maintenance phase, when a power outage is required for maintenance work, the operating procedure is as follows: (i) When the vacuum circuit breaker mechanism (31) is opened, the vacuum circuit breaker mechanism (31) in the switch function area (19) is switched to the open position to cut off the main circuit current and achieve electrical isolation. (ii) Three-position switch operation: switch the three-position switch to the open position to achieve physical isolation; Then switch the three-position switch to the closed position to ground the circuit; (iii) After the grounding is completed, close the vacuum circuit breaker mechanism (31) again to further confirm that the system is in a safe maintenance state; (iv) During maintenance, the system is isolated from the power supply of adjacent cabinets and is electrically connected to adjacent cabinets through the top expansion bus area (16).

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