Large-current high breaking performance gas insulated switchgear

Abstract

The application provides a large-current high-breaking performance gas tank, which comprises an upper gas tank and a lower gas tank fixedly connected, a pressure relief chamber is connected to the upper gas tank and the lower gas tank respectively, a middle partition plate is arranged between the upper gas tank and the lower gas tank, a connecting sleeve pipe for connecting the upper gas tank and the lower gas tank is arranged on the middle partition plate, a circuit breaker is arranged in the lower gas tank, the lower end of the connecting sleeve pipe is electrically connected to the circuit breaker through a lower wire, an internal heat dissipation component is arranged on a copper wire, an isolation and support component is arranged in the upper gas tank, the upper end of the connecting sleeve pipe is electrically connected to the isolation and support component, the isolation and support component is connected to the upper end heat dissipation component through an upper end heat dissipation guide, and the circuit breaker is connected to the lower end heat dissipation component through a heat dissipation guide. The gas tank is divided into the upper gas tank and the lower gas tank, and is isolated by the common middle partition plate; meanwhile, the upper end heat dissipation component and the lower end heat dissipation component are arranged in the upper gas tank and the lower gas tank respectively, and the two components cooperatively build an efficient solid heat conduction path.

Description

Technical Field

[0001] This invention relates to the field of gas-insulated switchgear, and more specifically to gas-insulated switchgear with high current and high breaking capacity. Background Technology

[0002] With the continuous increase in the load density of power distribution networks, gas-insulated switchgear is developing towards higher parameters, with a rated current of 4,000 amps and a short-time withstand current of 31.5 amps. However, under high current and high breaking conditions, the Joule heat generation of the main circuit conductor increases quadratically. Excessive temperature rise not only accelerates the aging of seals but also leads to the attenuation of sulfur hexafluoride gas insulation strength and the decline of the mechanical properties of copper conductors, becoming the core bottleneck restricting the improvement of the breaking performance of gas-insulated switchgear.

[0003] Gas-insulated switchgear relies on a fully sealed gas chamber structure to maintain the purity and pressure of the insulating medium, but this also cuts off the external heat conduction path. The outer shell of the gas chamber is usually made of steel plate, which has a low thermal conductivity, causing internal heat to accumulate very easily. Existing solutions that add external heat dissipation fins only work on the surface of the cabinet shell and cannot solve the bottleneck of internal heat conduction to external cooling.

[0004] To address the heat dissipation challenge, some existing technologies attempt to install heat pipes or heat-conducting rods by drilling holes in the gas chamber wall. However, this directly disrupts the original welded sealing system of the gas chamber. Such solutions not only pose a risk of weld leakage, but the introduced organic heat-conducting medium is also prone to decomposition and aging under long-term high temperatures and electrical stress, ultimately reducing equipment reliability. Therefore, significantly improving the heat dissipation efficiency of the internal conductors without compromising the fully sealed structure of the gas chamber or introducing easily degradable media remains a pressing technical challenge in this field.

[0005] To address these issues, a high-current, high-breaking-capacity gas-insulated switchgear is proposed. Summary of the Invention

[0006] To overcome the problems of insufficient heat dissipation capacity of sealed gas boxes and excessive temperature rise under high current conditions in existing technologies, this invention provides a gas-filled switchgear with high current and high breaking performance.

[0007] This invention is achieved using the following technical solution: A high-current, high-breaking-performance gas-filled switchgear, characterized in that it comprises: a housing and a pressure relief chamber, wherein the housing is fixedly connected by an upper gas box and a lower gas box, and pressure relief chambers are respectively connected to the upper and lower gas boxes, a partition is provided between the upper and lower gas boxes, a connecting sleeve for connecting the upper and lower gas boxes is provided on the partition, a circuit breaker is provided in the lower gas box, the lower end of the connecting sleeve is electrically connected to the circuit breaker through a lower cable, an internal heat dissipation component is provided on the wiring copper busbar, an isolation and support component is provided in the upper gas box, and the upper end of the connecting sleeve is electrically connected to the isolation and support component; The upper air box has upper heat dissipation components on both sides of its side walls, and the lower air box has lower heat dissipation components on both sides of its side walls. The isolation and support components are connected to the upper heat dissipation components through upper heat dissipation guides, and the circuit breaker is connected to the lower heat dissipation components through heat dissipation guides.

[0008] As a preferred embodiment of the present invention, a three-position operating mechanism is provided on one side of the upper air box. The isolation and support component includes an isolation contact and a support insulator. One end of the isolation contact is connected to the three-position operating mechanism, and the other end is fixed in the upper air box through the support insulator. The other end of the support insulator has a connecting pipe, and a mounting plate is provided at the end of the connecting pipe. The mounting plate is installed on the inner side wall of the upper air box. The isolating contact and the supporting insulator are fitted with a heat dissipation frame, on which multiple annular plates are distributed, and the annular plates are arranged at intervals along the axial direction.

[0009] In a preferred embodiment of the present invention, the upper heat dissipation component includes an upper heat dissipation boss, and the lower heat dissipation component includes a lower heat dissipation boss. The upper heat dissipation boss and the lower heat dissipation boss are respectively sealed to the upper air box and the lower air box through flange pipes.

[0010] As a preferred embodiment of the present invention, the upper air box has a horizontal row inside, and side sleeves are provided at both ends of the horizontal row. The upper heat dissipation conductor includes a wiring copper busbar. One end of the wiring copper busbar is electrically connected to the isolation contact, and the other end of the wiring copper busbar is electrically connected to the horizontal row through the wiring copper busbar. A heat-conducting component is installed on the wiring copper busbar. The heat-conducting component conducts heat to the upper heat dissipation boss and dissipates it to the outside of the upper air box. The heat-conducting component includes two fitting sleeves. One sleeve has a sliding groove, and the other sleeve has a slider that mates with the sliding groove. The two sleeves are spliced ​​together and bolted together. A transfer copper busbar is provided on one side of the sleeve. A connector is provided at the end of the transfer copper busbar. The connector is electrically fixedly connected to the upper heat dissipation boss through a plug-in component.

[0011] As a preferred embodiment of the present invention, the plug-in component includes a mating connector, two of which are symmetrically arranged on both sides of the transmission copper busbar. The mating connector is fixed to the inner side wall of the upper heat dissipation boss. A folding spring is provided on the inner side of the mating connector, and a contact plate is provided at the end of the folding spring. The contact plate abuts against the connector. The folding spring provides elastic pressure to ensure that the contact plate and the connector maintain stable electrical contact. The mating connector and the connector are axially limited by a positioning pin.

[0012] As a preferred embodiment of the present invention, a control mechanism is provided on one side of the lower air box. The control mechanism is connected to the circuit breaker. An installation plug is provided between the connecting sleeve and the lower cable. An internal heat dissipation component is installed in the installation plug. The internal heat dissipation component includes a first heat dissipation support plate. The first heat dissipation support plate is symmetrically distributed and fits against the side wall of the lower cable. The lower heat dissipation conductor includes an outer wiring copper busbar and an inner wiring copper busbar. The lower busbar is arranged in multiple parallel layers. The outer wiring copper busbar is connected to the outer side of the lower busbar, and the inner wiring copper busbar is connected to the inner side of the lower busbar. Both the outer wiring copper busbar and the inner wiring copper busbar extend to the lower heat dissipation boss for fixed connection.

[0013] As a preferred embodiment of the present invention, a tapered sleeve is provided on the side wall of the lower air box, and a sleeve plug is provided at the connecting end of the tapered sleeve. A first copper busbar and a second copper busbar are respectively provided inside the sleeve plug. The first copper busbar extends and is electrically connected to the upper end of the circuit breaker, and the second copper busbar extends and is electrically connected to the lower end of the circuit breaker. A second heat dissipation support plate is closely attached between the first copper busbar and the second copper busbar. The second heat dissipation support plate is attached to the side wall of the circuit breaker to assist in heat dissipation. Several scales are provided on the outer peripheral walls of the first heat dissipation support plate and the second heat dissipation support plate.

[0014] As a preferred embodiment of the present invention, the circuit breaker is provided with a solid-sealed pole, and the solid-sealed pole has a vacuum interrupter inside, the vacuum interrupter adopting a hemispherical contact.

[0015] As a preferred embodiment of the present invention, the pressure relief chamber includes an upper pressure relief top cover and a lower pressure relief top cover. Pressure relief installation ports are provided on the side walls of the upper air box and the lower air box. The upper pressure relief top cover and the lower pressure relief top cover are respectively covered by sealing flanges at the corresponding pressure relief installation ports. Pressure relief aluminum plates are provided at the ends of the upper pressure relief top cover and the lower pressure relief top cover, and pressure relief valves are provided at the top of the pressure relief aluminum plates. Multiple heat dissipation fins are arranged on the outer walls of the upper and lower air boxes, the outer surfaces of the upper and lower heat dissipation bosses, and the outer wall of the pressure relief aluminum plate.

[0016] As a preferred embodiment of the present invention, a desiccant box is provided inside the box, and multiple desiccant boxes are provided, respectively located at the inner corners of the upper and lower air boxes.

[0017] Compared with the prior art, the advantages of this invention are: 1. This invention divides the gas chamber into an upper gas chamber and a lower gas chamber, separated by a common partition. While achieving independent sealing and electrical connectivity between the gas chambers, upper and lower heat dissipation components are respectively installed in the upper and lower gas chambers, working together to construct an efficient solid-state heat conduction path. The isolation and support components and the circuit breaker are thermally coupled to their corresponding heat dissipation components via thermally conductive connectors, significantly improving heat dissipation efficiency while maintaining the compactness of the cabinet structure. This overcomes the inherent contradiction between the fully sealed structure of traditional gas-insulated cabinets and heat dissipation requirements.

[0018] 2. In this invention, the upper and lower heat dissipation bosses are integrally formed with the side walls of the upper and lower air boxes, respectively, and are sealed to the air box walls via flange connections, making the bosses themselves part of the air box wall. The bosses protrude outwards and have a significantly larger surface area than ordinary air box walls, ensuring that the heat conduction path from the inside of the air box to the outside passes through only one metal wall thickness. Compared to existing technologies that require opening holes to install heat pipes or heat-conducting rods, this invention eliminates the need for additional through holes, avoiding the risk of weld leakage and eliminating the risk of decomposition and aging of the organic heat-conducting medium.

[0019] 3. The heat-conducting component of this invention is fixedly wrapped around the outer periphery of the wiring copper busbar via a clamping splicing structure. The connector at the end of the copper busbar is fixedly connected to the upper heat dissipation boss via a plug-in component. The plug-in component includes a mating joint, a folding spring, and a contact plate. The folding spring provides continuous elastic pressure to ensure that the contact plate and the connector always maintain a tight contact. This structure results in extremely low contact resistance, allowing for efficient current and heat flow. It also automatically compensates for thermal expansion and contraction, avoids stress concentration caused by rigid connections, and allows for direct external disassembly and maintenance without damaging the gas chamber seal. 4. The lower cabling of this invention adopts a multi-layer parallel arrangement. The outer and inner copper busbars are respectively connected to the outer and inner walls of the lower cabling, and both extend to the lower heat dissipation boss for fixed connection, forming a double-sided symmetrical heat conduction channel. The mounting plug is provided with symmetrically distributed first heat dissipation support plates, which are closely attached to the side wall of the lower cabling. A second heat dissipation support plate is attached to the side wall of the circuit breaker. The second heat dissipation support plate is also closely attached between the first and second copper busbars. Through multi-point contact and multi-path parallel method, heat is evenly distributed, effectively suppressing the formation of local hot spots under high current carrying conditions.

[0020] 5. This invention features multiple heat dissipation fins arranged on the outer walls of the upper and lower air boxes, the outer surfaces of the upper and lower heat dissipation bosses, and the outer wall of the pressure relief aluminum plate, forming a coordinated heat dissipation fin layout covering the entire cabinet area. The heat dissipation fins on the outer surfaces of the upper and lower heat dissipation bosses directly receive the heat conducted from the internal high-heat components. The heat dissipation fins on the outer wall of the pressure relief aluminum plate increase the heat dissipation area while ensuring the pressure relief function. Combined with the internal multi-path solid heat conduction channels, a continuous and efficient heat dissipation link is constructed from the internal heat source to the external environment.

[0021] 6. The heat-conducting component on the copper busbar of this invention includes two fitting sleeves, one of which has a sliding groove, and the other has a slider that mates with the sliding groove. The two sleeves are spliced ​​together and fastened with bolts. A transfer copper busbar is located on one side of the sleeve. The sliding groove and slider guiding splicing structure allows the heat-conducting component to clamp the copper busbar from different directions, achieving a stable mechanical connection and efficient heat conduction without on-site welding, avoiding damage to surrounding insulation components caused by high welding temperatures. Simultaneously, the sleeves can be removed from the copper busbar by loosening the bolts, achieving quick, weld-free assembly and disassembly of the heat-conducting component and maintaining its maintainability. Furthermore, the mating distance between the sliding groove and slider can adapt to copper busbars of different thicknesses, offering strong versatility. Attached Figure Description

[0022] Figure 1 This is a first-view structural diagram of the overall assembly of the device of the present invention; Figure 2 This is a second-view structural diagram of the overall assembly of the device of the present invention; Figure 3 This is a structural diagram of the upper heat dissipation component and the lower heat dissipation component of the present invention; Figure 4 This is a first-view structural diagram of the internal components of the housing of the present invention; Figure 5 This is a second-view structural diagram of the internal components of the housing of the present invention; Figure 6 This is a structural diagram of the internal components of the upper air box of the present invention; Figure 7 This is a structural diagram of the internal components of the lower air box of the present invention; Figure 8 This is a structural diagram of the card sleeve of the present invention; Figure 9 This is a structural diagram of the plug-in component of the present invention; Figure 10 This is a cross-sectional view of the folding spring and contact plate of the present invention; Figure 11 This is a cross-sectional view of the interior of the housing of the present invention; In the diagram: 1. Upper air box; 10. Lower air box; 100. Middle partition plate; 11. Three-position operating mechanism; 12. Connecting bushing; 13. Circuit breaker; 131. Control mechanism; 132. Solid-sealed pole; 2. Isolating contact; 20. Heat sink; 200. Annular plate; 21. Support insulator; 22. Connecting pipe; 221. Mounting support plate; 3. Upper pressure relief cover; 30. Sealing flange; 31. Lower pressure relief cover; 32. Pressure relief aluminum plate; 33. Pressure relief valve; 4. Wiring copper busbar; 40. Horizontal row; 401. Side bushing; 41. Compression fitting; 411 1. Slide rail; 412. Slider; 42. Transfer copper busbar; 43. Connector; 5. Upper heat dissipation boss; 51. Flange connector; 52. Butt joint; 53. Folding spring; 54. Contact plate; 55. Positioning pin; 6. Lower cabling; 61. Mounting plug; 62. First heat dissipation support plate; 621. Fins; 63. Outer wiring copper busbar; 64. Inner wiring copper busbar; 7. Tapered sleeve; 71. First copper busbar; 72. Second copper busbar; 73. Sleeve plug; 74. Second heat dissipation support plate; 8. Lower heat dissipation boss; 800. Heat dissipation fins; 9. Desiccant box. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example: Please see Figures 1-8 High-current, high-breaking-capacity gas-insulated switchgear, including: enclosure and pressure relief chamber, such as... Figure 1 As shown, the enclosure consists of two parts: an air chamber and a pressure relief chamber. The air chamber is divided into an upper air chamber 1 and a lower air chamber 10. The upper air chamber 1 is fixedly connected to the top of the lower air chamber 10, and the upper and lower air chambers 10 are integrally formed by welding. A partition 100 is provided between the upper and lower air chambers 10, dividing the internal space of the air chamber into independent sealed chambers. A connecting sleeve 12 is provided on the partition 100 to connect the upper and lower air chambers 10 for electrical connection. A circuit breaker 13 is installed inside the lower air chamber 10, and the lower end of the connecting sleeve 12 is electrically connected to the circuit breaker 13 via a lower cable 6. An internal heat dissipation component is provided on the wiring busbar 4, and an isolation and support component is provided inside the upper air chamber 1. The upper end of the connecting sleeve 12 is electrically connected to the isolation and support component.

[0025] Pressure relief chambers are connected to the upper air box 1 and the lower air box 10, respectively. Specifically, the pressure relief chamber includes an upper pressure relief cover 3 and a lower pressure relief cover 31. Pressure relief installation ports are provided on the side walls of both the upper air box 1 and the lower air box 10. These ports are notches on the side walls to facilitate the installation of the corresponding pressure relief covers. The upper pressure relief cover 3 and the lower pressure relief cover 31 are respectively covered by sealing flanges 30 at their respective pressure relief installation ports to ensure the airtightness of the upper air box 1 and the lower air box 10. Pressure relief aluminum plates 32 are provided at the ends of both the upper pressure relief cover 3 and the lower pressure relief cover 31. Pressure relief valves 33 are provided at the top of the pressure relief aluminum plates 32 for directional pressure relief in case of abnormal internal pressure, ensuring equipment safety.

[0026] like Figure 1 As shown, both sides of the upper air box 1 are provided with upper heat dissipation components for heat dissipation, and both sides of the lower air box 10 are provided with lower heat dissipation components for heat dissipation. The isolation and support components are connected to the upper heat dissipation components through upper heat dissipation guides, and the circuit breaker 13 is connected to the lower heat dissipation components through lower heat dissipation guides, thereby guiding the heat from the internal high-heat components to the external heat dissipation structures of the upper air box 1 and the lower air box 10, respectively.

[0027] Specifically, the upper heat dissipation component includes an upper heat dissipation boss 5, and the lower heat dissipation component includes a lower heat dissipation boss 8. The upper heat dissipation boss 5 and the lower heat dissipation boss 8 are respectively sealed to the side walls of the upper air box 1 and the lower air box 10 via flange connectors 51. The upper heat dissipation boss 5 and the lower heat dissipation boss 8 are integrally formed with the side walls of the upper air box 1 and the lower air box 10, respectively, and form a sealed connection with the air box walls via flange connectors 51, making the boss itself part of the air box wall. The boss protrudes outwards, and its outer surface area is significantly larger than that of a normal air box wall. The heat conduction path from the inside of the air box to the outside passes through only one metal wall thickness, thereby significantly improving heat dissipation efficiency without compromising the air box's sealing performance.

[0028] In this embodiment, a three-position operating mechanism 11 is provided on one side of the upper air box 1 to drive the isolating contact 2 to switch between three positions: closing, opening, and grounding. The isolation and support component includes the isolating contact 2 and the supporting insulator 21. One end of the isolating contact 2 is connected to the three-position operating mechanism 11, and the other end is suspended inside the upper air box 1 through the supporting insulator 21, which provides electrical isolation and mechanical support. A connecting pipe 22 is provided at the other end of the supporting insulator 21, and a mounting plate 221 is provided at the end of the connecting pipe 22. The mounting plate 221 is fixedly installed on the inner wall of the upper air box 1 by bolts, thereby firmly positioning the entire isolation and support component inside the upper air box 1.

[0029] A heat sink 20 is fitted around the outer periphery of the isolating contact 2 and the supporting insulator 21. The heat sink 20 is an integrated metal component, and multiple annular plates 200 are distributed on the heat sink 20, which are spaced apart along the axial direction. The heat sink 20 is tightly fitted around the outer periphery of the isolating contact 2 and the supporting insulator 21, so that the Joule heat generated by the isolating contact 2 during operation can be conducted to the heat sink 20 through contact. There are gaps between the annular plates 200, and the annular plates 200 have a semi-annular structure, which increases the contact area with the surrounding insulating gas to improve the convective heat transfer efficiency, and also diffuses the heat radially to the outer edge through the thermal conductivity of the annular plates 200 themselves, forming an efficient heat conduction path from the inside to the outside, effectively reducing the temperature rise of the isolating contact 2 under continuous high current conditions.

[0030] In this embodiment, the upper gas box 1 contains a horizontal row 40, which extends laterally along the interior of the upper gas box 1 as part of the main busbar, and is used to conduct large currents between various functional units. Side sleeves 401 are provided at both ends of the horizontal row 40, and conductive contacts are embedded in the side sleeves 401, which are used to electrically connect the horizontal row 40 to the main circuit of the external side expansion busbar or other gas boxes, while ensuring gas sealing at the passage point.

[0031] The upper heat dissipation conductor includes a copper busbar 4. One end of the copper busbar 4 is electrically connected to the isolation contact 2 to introduce the current output by the isolation contact 2 into the horizontal row 40. The other end of the copper busbar 4 is electrically connected to the horizontal row 40 through a transmission copper busbar 42 to form a continuous conductive path from the inside of the upper air box 1 to the horizontal main circuit.

[0032] In this embodiment, a heat-conducting component is specifically described. A heat-conducting component is installed on the copper busbar 4, which conducts the heat generated during the operation of the copper busbar 4 to the upper heat dissipation protrusion 5 and dissipates it to the outside of the upper air box 1. Specifically, the heat-conducting component includes two fitting sleeves 41 that fit together. One sleeve 41 has a groove 411 on its inner wall, and the other sleeve 41 has a slider 412 on its outer wall that mates with the groove 411. The two sleeves 41 clamp the outer periphery of the copper busbar 4 from both sides through the guiding engagement of the groove 411 and the slider 412. After splicing, they are fastened with bolts, achieving a stable mechanical connection and efficient heat conduction without welding. A transfer copper busbar 42 is provided on one side of the sleeve 41, and a connector 43 is provided at the end of the transfer copper busbar 42. The end of the connector 43 is chamfered to facilitate installation guidance.

[0033] In this embodiment, the connector includes two mating joints 52, which are symmetrically arranged on both sides of the transmission copper busbar 42. The mating joints 52 are fixed to the inner sidewall of the upper heat dissipation boss 5. A folding spring 53 is provided inside the mating joint 52, and a contact plate 54 is provided at the end of the folding spring 53. Under the elastic force of the folding spring 53, the contact plate 54 tightly abuts against the outer surface of the connector 43. The folding spring 53 provides continuous elastic pressure to ensure that the contact plate 54 and the connector 43 always maintain stable and reliable electrical contact and heat conduction.

[0034] The butt joint 52 and the connector 43 are axially limited by a locating pin 55, which is a bolt. The locating pin 55 passes radially through the butt joint 52 and the connector 43 to prevent the connector 43 from axially separating from the butt joint 52 under thermal expansion and contraction or vibration conditions, thus ensuring the long-term reliability of the plug connection.

[0035] During installation, the connector 43 is first inserted between the two contact plates 54. The folding spring 53 is compressed by the contact plates 54, so that the connector 52, the folding spring 53 and the contact plates 54 are always in close contact with the transmission copper busbar 42 and the connector 43. This ensures that the connector 43 forms a stable conductive connection with the upper heat dissipation boss 5 through the plug-in component. Heat is continuously conducted to the upper heat dissipation boss 5 through the transmission copper busbar 42, the connector 43 and the plug-in component, and finally dissipated into the atmosphere by the heat dissipation fins 800 on the outer surface of the heat dissipation boss.

[0036] The guide and splicing structure of the slide 411 and slider 412 allows the heat-conducting components to clamp the copper busbar 4 from different directions, achieving a stable mechanical connection and efficient heat conduction without on-site welding, thus avoiding damage to surrounding insulation components caused by high welding temperatures.

[0037] In this embodiment, a control mechanism 131 is provided on one side of the lower air box 10. The control mechanism 131 is connected to the circuit breaker 13 and is used to drive the circuit breaker 13 to perform closing and opening operations. An installation plug 61 is provided between the connecting sleeve 12 and the lower cable 6. The installation plug 61 is used to realize the electrical connection between the connecting sleeve 12 and the lower cable 6, and at the same time provides an installation carrier for the internal heat dissipation components. An internal heat dissipation component is installed inside the installation plug 61. The internal heat dissipation component includes a first heat dissipation support plate 62. The first heat dissipation support plate 62 is symmetrically distributed and attached to the side wall of the lower cable 6. By increasing the contact area with the lower cable 6, the heat dissipation efficiency is improved, and the heat generated by the lower cable 6 during operation is quickly dissipated.

[0038] The lower cabling 6 is arranged in multiple parallel layers, with each layer of conductive branches sharing the large current to reduce the current density per unit cross-sectional area. The lower heat dissipation conductor includes an outer copper busbar 634 and an inner copper busbar 644. The outer copper busbar 634 is connected to the outside of the lower cabling 6, and the inner copper busbar 644 is connected to the inside of the lower cabling 6. The inner copper busbar 644 extends to one side of the lower heat dissipation boss 8, and the outer copper busbar 634 extends to the other end of the lower heat dissipation boss 8. The two are fixed at different positions on the lower heat dissipation boss 8, forming a uniform heat dissipation layout. This allows the heat from each layer of the lower cabling 6 to be evenly transferred to the lower heat dissipation boss 8, avoiding local hot spots. The heat is then dissipated into the atmosphere by the heat dissipation fins 800 on the outer surface of the lower heat dissipation boss 8.

[0039] In this embodiment, a tapered sleeve 7 is provided on the side wall of the lower air box 10. The tapered sleeve 7 is used to connect the cable chamber and lead the current to the downstream electrical equipment. A sleeve plug 73 is provided at the connecting end of the tapered sleeve 7. A first copper busbar 71 and a second copper busbar 72 are respectively provided in the sleeve plug 73. The first copper busbar 71 extends and is electrically connected to the upper end of the circuit breaker 13, and the second copper busbar 72 extends and is electrically connected to the lower end of the circuit breaker 13, forming a current path between the upper and lower ends of the circuit breaker 13.

[0040] A second heat dissipation support plate 74 is tightly attached between the first copper busbar 71 and the second copper busbar 72. The second heat dissipation support plate 74 is attached to the side wall of the circuit breaker 13 to assist in heat dissipation. Its principle is the same as that of the mounting plug 61 at the lower cable 6 and the first heat dissipation support plate 62. Both add a heat-conducting support plate tightly attached to the key conductive connection where the current flows. By increasing the contact area, the Joule heat of the wiring part is quickly dissipated, avoiding the concentration of local hot spots. Several scales 621 are provided on the outer peripheral wall of both the first heat dissipation support plate 62 and the second heat dissipation support plate 74 to further increase the heat dissipation area and improve the efficiency of convection and radiation heat dissipation.

[0041] If there is sufficient internal space in the lower air box 10, a set of copper busbars can also be set on the outer periphery of the first copper busbar 71 and the second copper busbar 72, which are directly connected to the lower heat dissipation boss 8 to increase the heat dissipation effect. The first copper busbar 71 and the second copper busbar 72 are connected to the circuit breaker 13 in two branches, respectively connected to the main circuit to form a complete breaking path.

[0042] Circuit breaker 13 is equipped with a solid-sealed pole 132, which integrally encapsulates the vacuum interrupter and conductive circuit with epoxy resin, forming an integrated insulating structure. The solid-sealed pole 132 contains a vacuum interrupter, which extinguishes the arc when circuit breaker 13 trips, withstands high voltage, and provides electrical isolation. The vacuum interrupter uses hemispherical contacts, which increase the arc diffusion area, allowing the arc energy to be distributed more evenly on the contact surface, reducing localized contact erosion, and improving the breaking performance and service life of circuit breaker 13.

[0043] Multiple heat dissipation fins 800 are arranged on the outer walls of the upper air box 1 and the lower air box 10, the outer surfaces of the upper heat dissipation boss 5 and the lower heat dissipation boss 8, and the outer wall of the pressure relief aluminum plate 32, forming a coordinated layout of heat dissipation fins 800 covering the entire cabinet. The heat dissipation fins 800 on the outer walls of the upper air box 1 and the lower air box 10 are responsible for auxiliary heat dissipation of the entire air box shell. The heat dissipation fins 800 on the outer surfaces of the upper heat dissipation boss 5 and the lower heat dissipation boss 8 directly receive the heat conducted from the internal high-heat components and dissipate it quickly. The heat dissipation fins 800 on the outer wall of the pressure relief aluminum plate 32 increase the heat dissipation area while ensuring the pressure relief function. The heat dissipation fins 800 and the pressure relief valve 33 are spatially staggered and do not interfere with each other.

[0044] The internal space is equipped with desiccant boxes 9. Specifically, multiple desiccant boxes 9 are installed at the corners of the inner walls of the upper air box 1 and the lower air box 10. The desiccant boxes 9 are filled with desiccant to suppress the decrease in insulation strength caused by increased humidity, thereby ensuring the long-term safe operation of the air box 10 under high current and high breaking conditions.

[0045] The principle of this invention is as follows: The gas box consists of an upper gas box 1 and a lower gas box 10, separated by a partition plate 100 to form two independent sealed chambers. While ensuring the airtightness of the insulating gas, heat dissipation protrusions are respectively provided on the side walls of the upper gas box 1 and the lower gas box 10. The heat dissipation protrusions are integrally formed with the gas box wall and sealed together by a flange connector 51, making the protrusions part of the gas box wall. The heat conduction path from the inside of the gas box to the outside passes through only one metal wall thickness.

[0046] Inside the upper gas box 1, a heat sink 20 is fitted around the isolating contact 2 and the supporting insulator 21. The annular plate 200 on the heat sink 20 increases the contact area with the insulating gas, forming the first stage of heat dissipation. The heat-conducting component on the wiring copper busbar 4 clamps the wiring copper busbar 4 from both sides through the structure of the sleeve 41, the slide groove 411, and the slider 412, achieving a stable connection and efficient heat conduction without welding. The transfer copper busbar 42 on the heat-conducting component is electrically and fixedly connected to the upper heat dissipation boss 5 through the connector 43 and the plug-in component. The folding spring 53 in the plug-in component provides continuous elastic pressure to ensure that the contact plate 54 and the connector 43 are always in tight contact, while automatically compensating for thermal expansion and contraction displacement.

[0047] Inside the lower air box 10, the mounting plug 61 is equipped with a first heat dissipation support plate 62, which is symmetrically attached to the side walls of each branch of the lower cabling 6. The lower cabling 6 adopts a multi-layer parallel arrangement, with the outer wiring copper busbar 634 and the inner wiring copper busbar 644 extending to opposite sides of the lower heat dissipation boss 8, forming a uniform heat dissipation layout. The first copper busbar 71 and the second copper busbar 72 inside the tapered sleeve 7 are tightly attached to the second heat dissipation support plate 74, which is also attached to the side wall of the circuit breaker 13, quickly dissipating the heat from the connection between the circuit breaker 13 and the copper busbar.

[0048] Ultimately, the heat dissipation fins 800 arranged on the outer walls of the upper and lower air boxes 1 and 10, the outer surfaces of the upper and lower heat dissipation protrusions 8, and the outer wall of the pressure relief aluminum plate 32 form a comprehensive coordinated heat dissipation layout. Combined with the internal multi-path solid heat conduction channels, a continuous and efficient heat dissipation link is constructed from the internal heat source to the external environment, effectively suppressing the temperature rise under high current and high current-carrying conditions and ensuring the long-term safe operation of the equipment.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-current, high-breaking-capacity gas-insulated switchgear, characterized in that, include: The upper air box (1) and the lower air box (10) are fixedly connected. The upper air box (1) and the lower air box (10) are respectively connected to pressure relief chambers. A middle partition (100) is provided between the upper air box (1) and the lower air box (10). A connecting sleeve (12) for connecting the upper air box (1) and the lower air box (10) is provided on the middle partition (100). A circuit breaker (13) is installed in the lower air box (10). The lower end of the connecting sleeve (12) is electrically connected to the circuit breaker (13) through the lower cable (6). An internal heat dissipation component is installed on the wiring copper busbar (4). An isolation and support component is installed in the upper air box (1). The upper end of the connecting sleeve (12) is electrically connected to the isolation and support component. The upper air box (1) has upper heat dissipation components on both sides of its side walls, and the lower air box (10) has lower heat dissipation components on both sides of its side walls. The isolation and support components are connected to the upper heat dissipation components through the upper heat dissipation guides, and the circuit breaker (13) is connected to the lower heat dissipation components through the heat dissipation guides.

2. The high-current, high-breaking-performance gas-insulated switchgear according to claim 1, characterized in that: A three-position operating mechanism (11) is provided on one side of the upper air box (1). The isolation and support components include an isolation contact (2) and a support insulator (21). One end of the isolation contact (2) is connected to the three-position operating mechanism (11) for transmission, and the other end is fixed in the upper air box (1) through the support insulator (21). The other end of the support insulator (21) has a connecting pipe (22). The end of the connecting pipe (22) is provided with a mounting plate (221). The mounting plate (221) is installed on the inner side wall of the upper air box (1). The isolating contact (2) and the supporting insulator (21) are fitted with a heat sink (20), and multiple annular plates (200) are distributed on the heat sink (20), which are spaced apart along the axial direction.

3. The high-current, high-breaking-performance gas-insulated switchgear according to claim 2, characterized in that: The upper heat dissipation component includes an upper heat dissipation boss (5), and the lower heat dissipation component includes a lower heat dissipation boss (8). The upper heat dissipation boss (5) and the lower heat dissipation boss (8) are respectively sealed to the upper air box (1) and the lower air box (10) through flange pipes (51).

4. The high-current, high-breaking-performance gas-insulated switchgear according to claim 3, characterized in that: The upper air box (1) has a horizontal row (40) inside. The horizontal row (40) has side sleeves (401) at both ends. The upper heat dissipation conductor includes a wire bus (4). One end of the wire bus (4) is electrically connected to the isolation contact (2), and the other end of the wire bus (4) is electrically connected to the horizontal row (40) through the wire bus (4). A heat-conducting component is provided on the wiring copper busbar (4). The heat-conducting component conducts heat to the upper heat dissipation boss (5) and dissipates it to the outside of the upper air box (1). The heat-conducting component includes two fitting sleeves (41) that fit together. One sleeve (41) has a sliding groove (411), and the other sleeve (41) has a slider (412) that cooperates with the sliding groove (411). After the two sleeves (41) are spliced ​​together, they are tightly attached to the outer peripheral wall of the wiring copper busbar (4) and bolted. A transmission copper busbar (42) is provided on one side of the sleeve (41). A connector (43) is provided at the end of the transmission copper busbar (42). The connector (43) is electrically fixedly connected to the upper heat dissipation boss (5) through a plug-in component.

5. The high-current, high-breaking-performance gas-insulated switchgear according to claim 4, characterized in that: The plug-in component includes a connector (52), two connectors (52) are provided and are symmetrically arranged on both sides of the transmission copper busbar (42). The connector (52) is fixed to the inner wall of the upper heat dissipation boss (5). A folding spring (53) is provided on the inner side of the connector (52). A contact plate (54) is provided at the end of the folding spring (53). The contact plate (54) abuts against the connector (43). The folding spring (53) provides elastic pressure to ensure that the contact plate (54) and the connector (43) maintain stable electrical contact. The connector (52) and the connector (43) are axially limited by a positioning pin (55).

6. The high-current, high-breaking-performance gas-insulated switchgear according to claim 5, characterized in that: A control mechanism (131) is provided on one side of the lower air box (10). The control mechanism (131) is connected to the circuit breaker (13) in a transmission manner. An installation plug (61) is provided between the connecting sleeve (12) and the lower cable (6). An internal heat dissipation component is installed inside the installation plug (61). The internal heat dissipation component includes a first heat dissipation support plate (62). The first heat dissipation support plate (62) is symmetrically distributed and fits against the side wall of the lower cable (6). The lower heat dissipation conductor includes an outer wiring copper busbar (63)(4) and an inner wiring copper busbar (64)(4). The lower busbar (6) is arranged in multiple parallel layers. The outer wiring copper busbar (63)(4) is connected to the outer side of the lower busbar (6), and the inner wiring copper busbar (64)(4) is connected to the inner side of the lower busbar (6). The outer wiring copper busbar (63)(4) and the inner wiring copper busbar (64)(4) both extend to the lower heat dissipation boss (8) and are fixedly connected.

7. The high-current, high-breaking-performance gas-insulated switchgear according to claim 6, characterized in that: A tapered sleeve (7) is provided on the side wall of the lower air box (10). A sleeve plug (73) is provided at the connecting end of the tapered sleeve (7). A first copper busbar (71) and a second copper busbar (72) are respectively provided in the sleeve plug (73). The first copper busbar (71) extends and is electrically connected to the upper end of the circuit breaker (13). The second copper busbar (72) extends and is electrically connected to the lower end of the circuit breaker (13). A second heat dissipation support plate (74) is closely attached between the first copper busbar (71) and the second copper busbar (72). The second heat dissipation support plate (74) is attached to the side wall of the circuit breaker (13) to assist in heat dissipation. Several scales (621) are provided on the outer peripheral walls of the first heat dissipation support plate (62) and the second heat dissipation support plate (74).

8. The high-current, high-breaking-performance gas-insulated switchgear according to claim 7, characterized in that: The circuit breaker (13) is provided with a solid-sealed pole (132), and the solid-sealed pole (132) has a vacuum interrupter inside, which adopts a hemispherical contact.

9. The high-current, high-breaking-performance gas-insulated switchgear according to claim 8, characterized in that: The pressure relief chamber includes an upper pressure relief cover (3) and a lower pressure relief cover (31). Pressure relief installation ports are provided on the side walls of the upper air box (1) and the lower air box (10). The upper pressure relief cover (3) and the lower pressure relief cover (31) are respectively covered by sealing flanges (30) at the corresponding pressure relief installation ports. Pressure relief aluminum plates (32) are provided at the ends of the upper pressure relief cover (3) and the lower pressure relief cover (31). Pressure relief valves (33) are provided at the top of the pressure relief aluminum plates (32). Multiple heat dissipation fins (800) are arranged on the outer walls of the upper air box (1) and the lower air box (10), the outer surfaces of the upper heat dissipation boss (5) and the lower heat dissipation boss (8), and the outer wall of the pressure relief aluminum plate (32).

10. The high-current, high-breaking-performance gas-insulated switchgear according to claim 9, characterized in that: The box is equipped with a desiccant box (9), and multiple desiccant boxes (9) are provided, which are respectively located at the corners of the inner walls of the upper air box (1) and the lower air box (10).

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