Busbar chamber structure and dry air insulation switch cabinet

Abstract

The application discloses a bus chamber structure and a dry air insulation switch cabinet, which comprises a bus chamber, a main bus, a static contact and an insulator arranged in the bus chamber; dry air is filled in the bus chamber; the main bus comprises a bus pipe and a bus plate arranged in the bus pipe, the bus plate extends along the axial direction of the bus pipe and separates the inner cavity of the bus pipe into a first heat dissipation channel and a second heat dissipation channel; the insulator and the static contact are fixedly connected to the two sides of the bus plate in the thickness direction, and the pipe wall of the bus pipe is provided with a first accommodation opening corresponding to the position of the static contact and a second accommodation opening corresponding to the position of the insulator. The application adopts the dry air insulation and the pipe-plate integrated structure, realizes the SF6-free environmental protection insulation, the uniform electric field distribution and the efficient natural heat dissipation, and is suitable for 40.5kV air insulation switch equipment.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to a busbar compartment structure and a dry air-insulated switchgear. Background Technology

[0002] In 40.5kV high-voltage switchgear, the busbar compartment, as a core electrical connection component, undertakes the functions of collecting, distributing, and transmitting electrical energy. Its structural reliability directly affects the insulation performance and operational safety of the entire switchgear. Currently, tank-type busbar compartments generally adopt a combination structure of main busbars, insulators, and stationary contacts to achieve stable electrical path connections.

[0003] There are two main types of existing main busbar structures: one is the multi-layer busbar stacked structure. Although the manufacturing process is mature, the skin effect is significant, which leads to a reduction in the effective current-carrying cross-sectional area and an increase in temperature rise. In addition, the external fastening bolts and other connecting parts are exposed, which can easily form electric field concentration points and weaken the overall insulation strength. The other is the traditional circular tube busbar structure. Although it has advantages such as low skin effect coefficient, regular shape and uniform electric field distribution, the inter-segment connection generally relies on metal clamps to achieve mechanical and electrical connection. This not only increases the manufacturing cost, but also has micro gaps at the clamp joints, which can easily become the starting point of partial discharge and reduce the insulation reliability.

[0004] In addition, to improve insulation performance, traditional busbar compartments are usually filled with insulating gases (such as SF6 or new environmentally friendly mixed gases) at a certain pressure. However, SF6 gas has an extremely high global warming potential (GWP=23900), and its greenhouse effect far exceeds that of carbon dioxide. Although environmentally friendly alternative gases such as C4F7N (GWP≈2090) promoted in recent years have significantly reduced environmental impact, it is still a synthetic fluorinated compound. Its long-term environmental fate, the toxicity of degradation products, and potential ecological accumulation effects are not yet fully clear, and there are potential environmental risks and regulatory uncertainties. Summary of the Invention

[0005] This invention addresses the technical problems of existing technologies, such as significant skin effect and reliance on high GWP insulating gas, by providing a busbar compartment structure with uniform electric field distribution, efficient heat dissipation, and no unknown environmental risks, as well as a dry air-insulated switchgear using this structure.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: a busbar chamber structure, including a busbar chamber, and a main busbar, a stationary contact, and an insulator disposed in the busbar chamber; the busbar chamber is filled with dry air; the main busbar includes a busbar tube and a busbar plate disposed in the busbar tube, the busbar plate extending along the axial direction of the busbar tube and dividing the inner cavity of the busbar tube into a first heat dissipation channel and a second heat dissipation channel; the insulator and the stationary contact are respectively fixedly connected to both sides of the busbar plate in the thickness direction, and the tube wall of the busbar tube is provided with a first clearance opening corresponding to the position of the stationary contact and a second clearance opening corresponding to the position of the insulator.

[0007] In a preferred embodiment, the outer contour of the cross-section of the busbar is circular or elliptical; the busbar and the busbar plate are integrally formed.

[0008] In a preferred embodiment, the main busbar includes multiple busbar units arranged sequentially along the axial direction. Each busbar unit includes a busbar tube and a busbar plate. The busbar plates of every two adjacent busbar units are fixedly connected to each other at their ends. The ends of the busbar tubes of every two adjacent busbar units are joined together, and a conductive equalizing ring is sleeved around the joint to balance the electric field distribution at the joint.

[0009] In a preferred embodiment, at least one end of the busbar tube of each busbar unit is provided with a notch, so that one side surface of the busbar plate at that end in the thickness direction is fully exposed, forming a mounting surface for docking; the busbar plates of each two adjacent busbar units are stacked together by their mounting surfaces and fixedly connected by at least one fastener; the end of the busbar tube is provided with a third clearance opening in the circumferential area outside the notch, so that the fastener can pass through to realize the connection and fixation between the busbar plates; the ends of the busbar tubes of each two adjacent busbar units are spliced ​​together circumferentially in the circumferential area outside the notch.

[0010] In a preferred embodiment, the busbar compartment includes a plurality of air boxes that are sequentially sealed and interconnected along the axial direction of the main busbar, and each air box is respectively equipped with the stationary contact and the insulator; each air box is provided with an inspection port, which is detachably connected to a sealing plate assembly, one end of the insulator is connected to the busbar plate, and the other end is connected to the sealing plate assembly.

[0011] In a preferred embodiment, the plurality of busbar units includes a plurality of first busbar units and at least one second busbar unit. Each gas box is equipped with a first busbar unit, which is connected to the stationary contact and the insulator and is located within the maintenance range of the corresponding gas box maintenance port. The first busbar units in every two adjacent gas boxes are connected through a second busbar unit.

[0012] In a preferred embodiment, the busbar plate of each busbar unit is respectively connected to the insulator and the stationary contact, and one end of each busbar unit is located within the maintenance range of the maintenance port of the corresponding gas box, while the other end extends into the adjacent gas box and is connected to one end of the adjacent busbar unit.

[0013] In a preferred embodiment, the stationary contact is located below the insulator, the first heat dissipation channel is located below the second heat dissipation channel, and the first heat dissipation channel connects to the lower space of the main busbar through a first gap between the stationary contact and the first clearance opening; the second heat dissipation channel connects to the upper space of the main busbar through a second gap between the insulator and the second clearance opening; the busbar plate is provided with at least one heat dissipation hole at the position between the first clearance opening and the second clearance opening, for connecting the first heat dissipation channel and the second heat dissipation channel to promote airflow circulation and heat convection.

[0014] In a preferred embodiment, the stationary contact and the insulator are coaxially arranged and fixed to the busbar plate by the same stationary contact bolt; the stationary contact bolt is fitted with a first washer and a second washer made of metal, the first washer being located between the busbar plate and the stationary contact, and the second washer being located between the busbar plate and the insulator.

[0015] The present invention also provides a dry air-insulated switchgear, including the busbar compartment structure as described above.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention eliminates the use of traditional SF6 or fluorinated mixed gases (such as C4F7N) by filling the busbar chamber with dry air as the insulating medium, fundamentally eliminating the environmental risks of greenhouse gases with high global warming potential and achieving true zero-carbon insulation. Simultaneously, this invention innovatively adopts a tube-plate composite main busbar structure: the busbar tube provides a regular external geometry to suppress electric field distortion and reduce the skin effect, while the busbar plate provides electrical connection functions and is completely built into the tube cavity, avoiding electric field concentration and insulation weaknesses caused by traditional exposed fasteners. Crucially, the busbar plate divides the inner cavity of the busbar tube into two axially connected heat dissipation channels, facilitating airflow circulation and effectively reducing temperature rise. The uniform distribution of the electric field and effective air circulation ensure excellent insulation performance by maintaining a slightly positive gas pressure within the busbar chamber, guaranteeing normal circuit breaker operation even if leakage reaches zero gauge pressure.

[0018] 2. The busbar adopts a circular or elliptical cross-section structure, which has the optimal electric field distribution characteristics and can effectively suppress tip discharge and local electric field distortion. The busbar and busbar are integrally formed, eliminating the need for welding or assembly seams, avoiding the increase in contact resistance and thermal stress concentration caused by the split structure, improving structural rigidity, electrical continuity and long-term operational reliability, while reducing manufacturing complexity and cost.

[0019] 3. The main busbar comprises multiple busbar units arranged axially, with the busbar plate ends of adjacent busbar units fixedly connected. The ends of the busbar tubes are spliced ​​together and fitted with conductive equalizing rings. This structural design allows the main busbar length to be flexibly extended as needed through modular busbar unit splicing. The busbar units can be standardized for mass production, significantly reducing manufacturing costs and assembly complexity. Adjacent busbar units are connected by busbar plates, allowing the fasteners to be hidden inside the busbar tubes, completely eliminating electric field distortion sources and insulation weaknesses caused by exposed fasteners, and greatly improving overall insulation reliability. Conductive equalizing rings are installed at the splicing points of adjacent busbar tubes to effectively bridge the small gaps caused by manufacturing tolerances or assembly errors, balance the electric field gradient in the splicing area, suppress local electric field enhancement, fundamentally suppress the initiation mechanism of electron emission and partial discharge, and raise the partial discharge initiation voltage in the splicing area to near the level of the busbar body, ensuring stable and reliable insulation performance during long-term operation.

[0020] 4. The notch design creates a fully exposed mating surface on one side of the busbar end, enabling surface contact and large contact area connection between busbars, greatly reducing contact resistance and temperature rise; the busbar tubes are spliced ​​around the notch to maintain overall integrity, and together with the equalizing ring, achieve reliable electrical and mechanical connection, taking into account conductivity and further improving the uniformity of electric field distribution.

[0021] 5. The busbar compartment is divided into multiple independent air boxes to achieve a modular layout of electrical functions; the sealing plate assembly is connected to the end of the insulator, which supports the independent disassembly of the sealing plate assembly for maintenance or replacement of insulators / static contacts without disassembling the entire cabinet or affecting adjacent circuits, which greatly improves operation and maintenance efficiency, reduces power outage time and maintenance costs, and improves system availability.

[0022] 6. The first busbar unit is centrally located within the gas box maintenance area, forming a modular structure with the stationary contact and insulator. This facilitates the complete removal from the maintenance port for replacement or maintenance, significantly improving the convenience of maintenance.

[0023] 7. Each busbar unit's busbar plate is connected to the aforementioned insulator and stationary contact. One end of each busbar unit is located within the maintenance range of the corresponding gas box's inspection port, while the other end extends into the adjacent gas box and connects to one end of the adjacent busbar unit. This layout design facilitates maintenance and connection while reducing the number of connection points between busbar units, thereby reducing the number of equalizing rings and fasteners, which helps to lower costs.

[0024] 8. The stationary contact is located below the insulator, with two heat dissipation channels distributed vertically. The lower heat dissipation channel connects to the lower space through a first gap between the stationary contact and the corresponding clearance opening, while the upper heat dissipation channel connects to the upper space through a second gap between the insulator and the corresponding clearance opening. The busbar plate has heat dissipation holes between the first and second gaps, connecting the two heat dissipation channels. This structural design allows cold air to enter the lower heat dissipation channel through the first gap and flow into the upper heat dissipation channel through the heat dissipation holes. The hot air formed after the cold air carries away heat from the heat dissipation channel can rise through the second gap, forming a natural thermal convection circulation, significantly improving the overall heat dissipation efficiency.

[0025] 9. The stationary contact and the insulator are coaxially arranged, so that the stationary contact and the insulator share a single mounting point, resulting in a compact structure, reduced space occupation, and lower assembly errors; the same stationary contact bolt is used for fixing, avoiding uneven stress caused by multiple installation points.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the busbar compartment structure and dry air insulated switchgear of the present invention are not limited to the embodiments. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view (partially not shown) of the busbar chamber structure of the present invention in Embodiment 1.

[0028] Figure 2 This is Example 1 Figure 1 Enlarged schematic diagram of part B in the middle;

[0029] Figure 3 This is a three-dimensional structural diagram of the first busbar unit of the present invention, as shown in Embodiment 1. Figure 1 ;

[0030] Figure 4 This is a three-dimensional structural diagram of the first busbar unit of the present invention, as shown in Embodiment 1. Figure 2 ;

[0031] Figure 5 This is a side view of the first busbar unit of the present invention in Embodiment 1;

[0032] Figure 6 This is a bottom view of the first busbar unit of the present invention in Embodiment 1;

[0033] Figure 7 This is Example 1 Figure 6 CC section view;

[0034] Figure 8 This is Example 1 Figure 1 AA section view;

[0035] Figure 9 This is Example 1 Figure 8 Enlarged diagram of section D in the middle;

[0036] Figure 10 This is a schematic diagram (cross-sectional view) of the airflow direction of the busbar chamber structure of the present invention in Embodiment 1.

[0037] Figure 11 This is a sectional view (showing a portion) of the busbar chamber structure of the present invention in Embodiment 2.

[0038] Figure 12 This is Example 2 Figure 11 An enlarged schematic diagram of section E in the middle;

[0039] In the diagram, 1. Busbar compartment; 2. Main busbar; 21. Busbar pipe; 211. First clearance opening; 212. Second clearance opening; 213. Notch; 214. Third clearance opening; 22. Busbar plate; 221. Mounting surface; 222. First mounting hole; 223. Heat dissipation hole; 224. Second mounting hole; 23. First heat dissipation channel; 24. Second heat dissipation channel; 3. Stationary contact; 4. Insulator; 5. Air box; 6. Sealing plate assembly; 61. Sealing plate; 62. Support plate; 63. Protective plate; 64. Pressure relief valve; 65. Air filling valve; 7. Stationary contact bolt; 71. First gasket; 72. Second gasket; 8. Fastener; 81. Bolt; 82. Nut; 83. Gasket; 9. Equalizing ring; 91. Set screw; 10. First busbar unit; 20. Second busbar unit; 30. Busbar unit. Detailed Implementation

[0040] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In addition, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] Example 1

[0043] Please see Figures 1-10 As shown, a busbar chamber structure of the present invention includes a busbar chamber 1, and a main busbar 2, a stationary contact 3, and an insulator 4 disposed in the busbar chamber 1. The busbar chamber 1 is filled with dry air as the insulating medium, completely eliminating the use of traditional SF6 or fluorine-containing mixed gases (such as C4F7N), fundamentally achieving zero-carbon insulation. The main busbar 2 extends horizontally and adopts a tube-plate composite structure, consisting of a busbar tube 21 and an axially extending busbar plate 22 inside it. The busbar plate 22 divides the inner cavity of the busbar tube 21 into a first heat dissipation channel 23 and a second heat dissipation channel 24, forming a stable airflow channel. The insulator 4 and the stationary contact 3 are respectively fixed on both sides of the busbar plate 22 in the thickness direction. The tube wall of the busbar tube 21 has a first clearance opening 211 and a second clearance opening 212 corresponding to the positions of the stationary contact 3 and the insulator 4, so as to allow the stationary contact 3, the insulator 4, and the busbar plate 22 to be connected and fixed.

[0044] Furthermore, the outer contour of the cross-section of the busbar 21 is circular or elliptical, making the cross-section of the main busbar 2 approximately θ-shaped. In this embodiment, the cross-section of the busbar 21 is preferably circular, which has optimal electric field distribution characteristics and can effectively suppress tip discharge and local electric field distortion. The busbar 21 and the busbar plate 22 are integrally formed, avoiding welding or assembly seams, thereby reducing the increase in contact resistance and thermal stress concentration caused by the split structure, improving structural rigidity, electrical continuity and long-term operational reliability, while reducing manufacturing complexity and cost.

[0045] Preferably, the main busbar 2 is composed of multiple busbar units sequentially spliced ​​along the axial direction. Each busbar unit includes an independent busbar tube 21 and a busbar plate 22. The ends of the busbar plates 22 of adjacent busbar units are fixedly connected, while the ends of the busbar tubes 21 are spliced ​​circumferentially, and a conductive equalizing ring 9 is fitted on the outer periphery to balance the electric field distribution in the splicing area. This modular structure not only supports flexible expansion of the length of the main busbar 2 and standardized mass production, but also completely eliminates exposed fasteners through a concealed connection method, significantly improving insulation reliability.

[0046] Specifically, such as Figures 2-7 As shown, at least one end of the busbar tube 21 of each busbar unit is provided with a notch 213, so that one side surface of the busbar plate 22 at that end in the thickness direction is fully exposed, forming a mounting surface 221 for docking; the busbar plates 22 of each two adjacent busbar units are attached and stacked through their mounting surfaces 221 and fixedly connected by at least one fastener 8; the end of the busbar tube 21 is provided with a third clearance opening 214 in the circumferential area outside the notch 213, so that the fastener 8 can pass through, thereby realizing the connection and fixation between the busbar plates 22.

[0047] like Figure 8 , Figure 9 As shown, the fastener 8 specifically includes a bolt 81, a nut 82, and a washer 83; the end of the busbar plate 22 is provided with a first mounting hole 222 penetrating its mounting surface 221. When adjacent busbar units are spliced, the mounting surfaces 221 of the two busbar plates 22 are first placed together, then the bolt 81 is passed through the washer 83 and the first mounting hole 222 of each busbar plate 22 in sequence, and finally the nut 82 is screwed on to complete the fixation.

[0048] The ends of the busbars 21 of each pair of adjacent busbar units are joined together circumferentially outside the notch 213, and then an equalizing ring 9 is fitted on them. The equalizing ring 9 is then secured to the wall of the busbar 21 using set screws 91. The equalizing ring 9 is made of copper or aluminum alloy. The cross-section of the equalizing ring 9 is circular, and its inner diameter is constant, matching the outer diameter of the busbar 21. The outer diameter of the equalizing ring 9 gradually decreases from its center to both ends, making its outer surface a curved surface convex outward from the center. This results in a smaller wall thickness at both ends of the equalizing ring 9, allowing for a smoother transition between the outer surface of the equalizing ring 9 and the outer surface of the busbar 21, thereby optimizing the electric field distribution characteristics and further reducing electric field distortion.

[0049] Since the cross-section of the busbar 21 is circular, the notch 213 is semi-circular, and the outline of the circumferential region of the end of the busbar 21 outside the notch 213 is also semi-circular. The central axis of the busbar 21 is collinear with the centerline of the mounting surface 221 along the length of the busbar plate 22. Therefore, the surface of the busbar plate 22 where its mounting surface 221 is located constitutes the symmetry plane of the busbar 21.

[0050] The busbar compartment 1 consists of multiple air boxes 5 that are sequentially sealed and interconnected along the axial direction. Each air box 5 is equipped with a stationary contact 3 and an insulator 4, and has a detachable inspection port. A sealing plate assembly 6 is detachably connected to the inspection port. One end of the insulator 4 is connected to the busbar plate 22, and the other end is connected to the cavity wall of the busbar compartment 1, so that each insulator 4 can support the main busbar 2 while achieving insulation of the busbar compartment 1 from the ground. Specifically, the other end of the insulator 4 is connected to the sealing plate assembly 6.

[0051] like Figure 2 As shown, the sealing plate assembly 6 includes a perforated support plate 62, a sealing plate 61, and a protective plate 63. The other end of the insulator 4 is connected to the support plate 62, which is located at the access port. The sealing plate 61 is stacked on the outside of the support plate 62 and is detachably connected to the air box 5 via a fastening assembly. The sealing plate 61 is equipped with an inflation valve 65 and a pressure relief valve 64. The protective plate 63 is detachably connected to the outside of the sealing plate 61 and covers the pressure relief valve 64. During installation and maintenance, only the sealing plate 61 needs to be removed, and conductor connections and internal component maintenance can be completed through the top access port, saving time and effort.

[0052] Multiple busbar units include multiple first busbar units 10 and at least one second busbar unit 20. The first busbar unit 10 and the second busbar unit 20 have the same structure, both including a busbar pipe 21 and a busbar plate disposed within the busbar pipe 21, but the length of the first busbar unit 10 is shorter than that of the second busbar unit 20. Each air box 5 contains one first busbar unit 10, which integrates a stationary contact 3 and an insulator 4, and is located within the maintenance range of the corresponding maintenance port. Therefore, the first busbar unit 10 has a first clearance opening 211 and a second clearance opening 212. The first busbar units 10 in adjacent air boxes 5 are connected by second busbar units 20. This layout ensures that all critical electrical components are within the operable area and forms a modular structure with the first busbar unit 10, stationary contact 3, and insulator 4, facilitating complete removal from the maintenance port for replacement or maintenance, significantly improving the convenience of maintenance.

[0053] Furthermore, the stationary contact 3 is located below the insulator 4, and the first heat dissipation channel 23 is located below the second heat dissipation channel 24. The first heat dissipation channel 23 connects to the space below the main busbar 2 through the first gap between the stationary contact 3 and the first clearance opening 211, and the second heat dissipation channel 24 connects to the space above the main busbar 2 through the second gap between the insulator 4 and the second clearance opening 212. The busbar plate 22 is provided with at least one heat dissipation hole 223 in the area between the first clearance opening 211 and the second clearance opening 212, connecting the first heat dissipation channel 23 and the second heat dissipation channel 24 to form a natural heat convection circulation path from bottom to top. Specifically, cold air enters the first heat dissipation channel 23 through the first gap, absorbs heat, rises to the second heat dissipation channel 24 through the heat dissipation hole 223, and is finally discharged through the second gap. Figure 10 As shown in the diagram, the arrows indicate the gas flow direction. Therefore, this structural design significantly improves heat dissipation efficiency, greatly reducing the temperature rise of main busbar 2, and eliminating the need for high-pressure gas-assisted cooling.

[0054] Furthermore, the stationary contact 3 is coaxially arranged with the insulator 4 and fixed to the busbar plate 22 by the same stationary contact bolt 7. The busbar plate 22 is provided with a second mounting hole 224 through which the stationary contact bolt 7 passes. Specifically, four heat dissipation holes 223 are provided, distributed at four corners around the second mounting hole 224. Figures 3-7 As shown, the stationary contact bolt 7 is fitted with a first washer 71 and a second washer 72. The first washer 71 is located between the busbar plate 22 and the stationary contact 3, and the second washer 72 is located between the busbar plate 22 and the insulator 4. Both the first washer 71 and the second washer 72 are made of metal, with the first washer 71 preferably made of copper and the second washer 72 preferably made of iron or aluminum. This coaxial integrated structure not only saves space but also effectively reduces assembly errors.

[0055] This invention discloses a busbar compartment structure that, by combining an insulating medium filled with dry air with an integrally formed tube-plate composite main busbar 2, fundamentally eliminates the use of traditional SF6 or fluorine-containing gases, achieving zero-carbon environmentally friendly insulation. The busbar plate 22 divides the inner cavity of the busbar tube 21 into two axial heat dissipation channels (a first heat dissipation channel 23 and a second heat dissipation channel 24), and, in conjunction with a first gap, a second gap, and heat dissipation holes 223, constructs a natural convection heat dissipation path, significantly reducing temperature rise. Through modular busbar unit splicing, electric field balancing with the equalizing ring 9, concealed fastening connection, and integrated design of the air box 5 and sealing plate 61, a synergistic optimization of compact structure, reliable insulation, convenient maintenance, and controllable manufacturing costs is achieved. This structure not only meets the insulation and heat dissipation performance requirements of 40.5kV high-voltage switchgear, but also ensures reliable circuit breaker interruption under conditions without high GWP gases, providing an efficient, safe, and mass-producible technical solution for a new generation of environmentally friendly air-insulated switchgear.

[0056] This invention also provides a dry air-insulated switchgear, which integrates the aforementioned busbar compartment structure. This dry air-insulated switchgear uses dry air as the insulating medium, features a compact structure, eliminates the risk of high GWP gases, provides efficient heat dissipation, and facilitates maintenance. It achieves a high degree of balance between environmental friendliness, safety, and economy, making it an ideal solution for the next generation of 40.5kV air-insulated switchgear.

[0057] Example 2

[0058] Please see Figure 11 , Figure 12 As shown, the main difference between the busbar compartment structure of the present invention and Embodiment 1 is that: the busbar plates 22 of each busbar unit 30 are respectively connected to insulators 4 and stationary contacts 3, and one end of each busbar unit 30 is located within the maintenance range of the maintenance port of the corresponding air box 5, while the other end extends into the adjacent air box 5 and is connected to one end of the adjacent busbar unit 30. This layout design ensures connection reliability while facilitating direct inspection and maintenance of connection points, and effectively reduces the total number of connection points between busbar units 30, thereby reducing the number of equalizing rings 9 and fasteners 8 used, which is beneficial for simplifying assembly and reducing manufacturing and maintenance costs.

[0059] The present invention relates to a busbar compartment structure and a dry air-insulated switchgear. The parts not described herein are the same as or can be implemented using existing technologies.

[0060] The above embodiments are only used to further illustrate a busbar compartment structure and a dry air-insulated switchgear of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A busbar compartment structure, comprising a busbar compartment, and a main busbar, stationary contacts, and insulators disposed within the busbar compartment; characterized in that: The busbar chamber is filled with dry air; the main busbar includes a busbar tube and a busbar plate disposed in the busbar tube, the busbar plate extends along the axial direction of the busbar tube and divides the inner cavity of the busbar tube into a first heat dissipation channel and a second heat dissipation channel; the insulator and the stationary contact are respectively fixedly connected to both sides of the busbar plate in the thickness direction, the tube wall of the busbar tube is provided with a first clearance opening corresponding to the position of the stationary contact, and a second clearance opening corresponding to the position of the insulator.

2. The busbar compartment structure according to claim 1, characterized in that: The outer contour of the cross-section of the busbar is circular or elliptical; the busbar and the busbar plate are integrally formed.

3. The busbar compartment structure according to claim 1 or 2, characterized in that: The main busbar includes multiple busbar units arranged sequentially along the axial direction. Each busbar unit includes a busbar tube and a busbar plate. The busbar plates of every two adjacent busbar units are fixedly connected to each other at their ends. The ends of the busbar tubes of every two adjacent busbar units are spliced ​​together, and a conductive equalizing ring is sleeved around the spliced ​​part to balance the electric field distribution at the spliced ​​part.

4. The busbar compartment structure according to claim 3, characterized in that: At least one end of the busbar tube of each busbar unit is provided with a notch, so that one side surface of the busbar plate at that end in the thickness direction is fully exposed, forming a mounting surface for docking; the busbar plates of each two adjacent busbar units are stacked together by their mounting surfaces and fixedly connected by at least one fastener; the end of the busbar tube is provided with a third clearance opening in the circumferential area outside the notch, so that the fastener can pass through to realize the connection and fixation between the busbar plates; the ends of the busbar tubes of each two adjacent busbar units are spliced ​​together circumferentially in the circumferential area outside the notch.

5. The busbar compartment structure according to claim 3, characterized in that: The busbar compartment includes multiple air boxes that are sequentially sealed and interconnected along the axial direction of the main busbar. Each air box is equipped with a stationary contact and an insulator. Each air box is provided with an inspection port, which is detachably connected to a sealing plate assembly. One end of the insulator is connected to the busbar plate, and the other end is connected to the sealing plate assembly.

6. The busbar compartment structure according to claim 5, characterized in that: The plurality of busbar units include a plurality of first busbar units and at least one second busbar unit. Each gas box is equipped with a first busbar unit, which is connected to the stationary contact and the insulator and is located within the maintenance range of the corresponding gas box maintenance port. The first busbar units in each of two adjacent gas boxes are connected through a second busbar unit.

7. The busbar compartment structure according to claim 5, characterized in that: Each busbar unit has a busbar plate connected to the insulator and stationary contact respectively, and one end of each busbar unit is located within the maintenance range of the maintenance port of the corresponding gas box, while the other end extends into the adjacent gas box and is connected to one end of the adjacent busbar unit.

8. The busbar compartment structure according to claim 1, characterized in that: The stationary contact is located below the insulator, the first heat dissipation channel is located below the second heat dissipation channel, and the first heat dissipation channel is connected to the space below the main busbar through the first gap between the stationary contact and the first clearance opening; The second heat dissipation channel connects to the space above the main busbar through a second gap between the insulator and the second clearance opening; The busbar plate has at least one heat dissipation hole at the position between the first clearance opening and the second clearance opening, which is used to connect the first heat dissipation channel and the second heat dissipation channel to promote airflow circulation and heat convection.

9. The busbar compartment structure according to claim 1, characterized in that: The stationary contact and the insulator are coaxially arranged and fixed to the busbar plate by the same stationary contact bolt; the stationary contact bolt is fitted with a first washer and a second washer made of metal, the first washer being located between the busbar plate and the stationary contact, and the second washer being located between the busbar plate and the insulator.

10. A dry air-insulated switchgear, characterized in that: Includes the busbar compartment structure as described in any one of claims 1-9.

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