High-voltage switchgear

Abstract

The utility model belongs to the technical field of high-voltage electrical appliances, and discloses a high-voltage switchgear. The high-voltage switch equipment comprises a cabinet body, a contact assembly and a vacuum circuit breaker, an instrument chamber, a handcart chamber, a cable chamber and a main bus chamber are arranged in the cabinet body, and the total width of the cabinet body is 800mm; the contact assembly comprises a first contact box and a second contact box, the first contact box is arranged in the main bus chamber, and the second contact box is arranged in the cable chamber; the vacuum circuit breaker is arranged in the handcart chamber and comprises a bus contact and an outgoing line contact, the bus contact can be inserted into the first contact box, and the outgoing line contact can be inserted into the second contact box; one side, close to the main bus chamber and the cable chamber, of the handcart chamber is provided with a sliding door and two crank arms, the two crank arms are arranged on the two sides of the sliding door and can drive the sliding door to move and expose or block the first contact box and the second contact box, and the crank arms are bent outwards by 25mm; the vacuum circuit breaker further comprises a solid-sealed polar pole and an arc extinguish chamber, a cavity is arranged in the solid-sealed polar pole, and the arc extinguish chamber is arranged in the cavity.

Description

Technical Field

[0001] This utility model relates to the field of high voltage electrical technology, and in particular to a high voltage switchgear. Background Technology

[0002] High-voltage switchgear refers to indoor and outdoor AC switchgear operating in power systems with voltages of 3kV and above and frequencies of 50Hz and below. It is mainly used for the control and protection of power systems (including power plants, substations, transmission and distribution lines, and industrial and mining enterprises). It can both put into operation or take off a portion of power equipment or lines according to the needs of the power grid, and quickly disconnect the faulty part from the grid when a fault occurs, thereby ensuring the normal operation of the fault-free parts of the grid and the safety of equipment and maintenance personnel. Therefore, high-voltage switchgear is a very important transmission and distribution equipment, and its safe and reliable operation is of great significance to the safe and efficient operation of the power system.

[0003] Due to the scarcity of land resources and the harsh industrial environment, existing high-voltage switchgear is large and takes up a lot of space. If the size of high-voltage switchgear is to be reduced, the insulation margin of the circuit breaker will be insufficient, which poses a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide a high-voltage switchgear to solve the problem that the existing high-voltage switchgear is large in size and occupies a lot of space; if the size of the high-voltage switchgear is to be reduced, the problem of insufficient insulation margin of the circuit breaker will be faced, thereby reducing the land resources occupied by the high-voltage switchgear.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A high-voltage switchgear is provided, comprising:

[0007] The cabinet includes an instrument compartment, a handcart compartment, a cable compartment, and a main busbar compartment. The total width of the cabinet is 800mm.

[0008] A contact assembly, comprising a first contact box and a second contact box, wherein the first contact box is disposed in the main busbar compartment and the second contact box is disposed in the cable compartment;

[0009] A vacuum circuit breaker is installed in the handcart compartment. The vacuum circuit breaker includes busbar contacts and outgoing contacts. The busbar contacts can be inserted into the first contact box, and the outgoing contacts can be inserted into the second contact box. A sliding door and crank arms are provided on the side of the handcart compartment near the main busbar compartment and the cable compartment. There are two crank arms on both sides of the sliding door, which can drive the sliding door to move and expose or block the first contact box and the second contact box. The crank arms are bent outward by 25mm. The vacuum circuit breaker also includes a solid-sealed pole and an arc-extinguishing chamber. A cavity is provided inside the solid-sealed pole, and the arc-extinguishing chamber is located inside the cavity.

[0010] As an optional technical solution for high-voltage switchgear, the cabinet also includes a connecting plate, one end of which is connected to the crank arm and the other end of which is connected to the sliding door. The connecting plate is tilted upwards and raised by 25mm.

[0011] As an optional technical solution for high-voltage switchgear, an epoxy resin layer is provided between the solid-sealed pole and the arc-extinguishing chamber.

[0012] As an optional technical solution for high-voltage switchgear, a first stationary contact is provided in the first contact box, a second stationary contact is provided in the second contact box, the busbar contact is connected to the first stationary contact, and the outgoing contact is connected to the second stationary contact.

[0013] As an optional technical solution for high-voltage switchgear, the high-voltage switchgear further includes a busbar assembly, which includes a main busbar, a busbar bushing, an upper branch busbar, and a lower branch busbar. The busbar bushing is installed through the side wall of the main busbar compartment. The main busbar extends into the main busbar compartment through the busbar bushing and is connected to the upper branch busbar. The upper branch busbar extends into the first contact box and is connected to the first stationary contact. The lower branch busbar is located in the cable compartment and one end extends into the second contact box and is connected to the second stationary contact.

[0014] As an optional technical solution for high-voltage switchgear, the high-voltage switchgear further includes an insulation component, which includes a main busbar support insulator and an upper branch busbar support insulator. The main busbar support insulator fixes the main busbar to the main busbar compartment, and the upper branch busbar support insulator fixes the upper branch busbar to the main busbar compartment.

[0015] As an optional technical solution for high-voltage switchgear, the high-voltage switchgear also includes a post-mounted instrument transformer, which is located in the cable room and connected to the other end of the lower busbar.

[0016] As an optional technical solution for high-voltage switchgear, the high-voltage switchgear also includes a grounding switch, which is located in the cable room and connected to the post-mounted instrument transformer.

[0017] As an optional technical solution for high-voltage switchgear, the high-voltage switchgear further includes a transmission assembly, which is arranged horizontally in the cable chamber. The transmission assembly includes an operating shaft, a drive bevel gear, and a main bevel gear. The operating shaft is connected to the drive bevel gear, and the drive bevel gear meshes with the main bevel gear. The grounding switch includes a transmission shaft, which is located at the axis of the main bevel gear. The rotation of the operating shaft drives the transmission shaft to rotate, thereby closing or opening the grounding switch.

[0018] As an optional technical solution for high-voltage switchgear, the cable compartment includes a first cabinet door, and the transmission assembly further includes a driven bevel gear, which forms a locking relationship with the first cabinet door.

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

[0020] This application discloses a high-voltage switchgear, including a cabinet, a contact assembly, and a vacuum circuit breaker. The cabinet interior includes an instrument compartment, a truck compartment, a cable compartment, and a main busbar compartment, with a total width of 800 mm. The contact assembly includes a first contact box and a second contact box, with the first contact box located in the main busbar compartment and the second contact box located in the cable compartment. The vacuum circuit breaker is located in the truck compartment and includes busbar contacts and outgoing contacts. The busbar contacts can be inserted into the first contact box, and the outgoing contacts can be inserted into the second contact box. A sliding door and crank arms are provided on the side of the truck compartment near the main busbar compartment and the cable compartment. Two crank arms are provided on both sides of the sliding door and can drive the sliding door to move and expose or block the first and second contact boxes. The crank arms are bent outward by 25 mm. The vacuum circuit breaker also includes a solid-sealed pole and an arc-extinguishing chamber. A cavity is provided inside the solid-sealed pole, and the arc-extinguishing chamber is located inside the cavity. By setting the total width of the cabinet to 800mm and placing the arc-extinguishing chamber inside the solid-sealed pole, the volume of the cabinet is reduced. At the same time, the crank arms on both sides of the sliding door are bent outward by 25mm to increase the air clearance between the crank arms and the vacuum circuit breaker, thereby increasing the insulation margin of the vacuum circuit breaker. This reduces the land occupation of high-voltage switchgear without affecting the safety of the vacuum circuit breaker. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a first-view isometric view of the high-voltage switchgear provided in this embodiment of the utility model;

[0023] Figure 2 This is a second-view isometric view of the high-voltage switchgear provided in this embodiment of the utility model;

[0024] Figure 3 This is a first schematic diagram of a portion of the structure of the high-voltage switchgear provided in this embodiment of the utility model;

[0025] Figure 4 This is a second schematic diagram of a portion of the structure of the high-voltage switchgear provided in this embodiment of the utility model;

[0026] Figure 5 This is a third schematic diagram of a portion of the structure of the high-voltage switchgear provided in this embodiment of the utility model;

[0027] Figure 6 This is a third schematic diagram of a portion of the structure of the high-voltage switchgear provided in this embodiment of the utility model.

[0028] In the picture:

[0029] 10. Cabinet body; 11. Sliding door; 12. Crank arm; 13. Connecting plate; 14. First cabinet door; 15. Second cabinet door; 16. Third cabinet door; 17. Fourth cabinet door; 18. Slide rail; 19. Limit screw;

[0030] 20. Contact assembly; 21. First contact box; 211. First stationary contact; 22. Second contact box; 221. Second stationary contact;

[0031] 30. Vacuum circuit breaker; 31. Busbar contact; 311. Plum blossom contact; 32. Outgoing contact; 33. Solid-sealed pole; 34. Arc extinguishing chamber; 35. Upper stationary outgoing terminal block; 36. Moving outgoing terminal block;

[0032] 40. Busbar assembly; 41. Main busbar; 42. Busbar bushing; 43. Upper branch busbar; 44. Lower branch busbar;

[0033] 50. Insulation components; 51. Main busbar support insulators; 52. Upper branch busbar support insulators;

[0034] 60. Post-mounted instrument transformer;

[0035] 70. Grounding switch; 71. Drive shaft;

[0036] 80. Transmission assembly; 81. Operating shaft; 82. Drive bevel gear; 83. Main bevel gear; 84. Driven bevel gear;

[0037] 90. Cable splice strip. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] Due to the scarcity of land resources and the harsh industrial environment, existing high-voltage switchgear is large and takes up a lot of space. If the size of high-voltage switchgear is to be reduced, the insulation margin of the circuit breaker will be insufficient, which poses a safety hazard.

[0043] To address the aforementioned problems, this embodiment provides a high-voltage switchgear, see reference. Figure 1 and Figure 2 It includes a cabinet 10, a contact assembly 20, and a vacuum circuit breaker 30.

[0044] Furthermore, the cabinet 10 internally includes an instrument compartment, a handcart compartment, a cable compartment, and a main busbar compartment, with a total width of 800mm. In this embodiment, the cabinet 10 is configured as a cuboid, with dimensions of 1650mm * 800mm * 2300mm. Specifically, the instrument compartment, handcart compartment, cable compartment, and main busbar compartment are separated by metal partitions to meet the requirements of the national standard LSC2B. Specifically, the instrument compartment and handcart compartment are located on the same side, with the instrument compartment above the handcart compartment, and the cable compartment and main busbar compartment are located on the same side, with the main busbar compartment above the cable compartment. Specifically, a second cabinet door 15 is provided on one side of the instrument compartment, a third cabinet door 16 is provided on the same side of the handcart compartment as the instrument compartment, and a fourth cabinet door 17 is provided on the same side of the cable compartment as the instrument compartment.

[0045] Furthermore, the contact assembly 20 includes a first contact box 21 and a second contact box 22. The first contact box 21 is located in the main busbar compartment, and the second contact box 22 is located in the cable compartment. Specifically, the first contact box 21 and the second contact box 22 are made of insulating material. For example, the insulating material includes ceramic, rubber, or mica, etc.

[0046] Furthermore, the vacuum circuit breaker 30 is located in the truck compartment. The vacuum circuit breaker 30 includes a busbar contact 31 and an outgoing contact 32. The busbar contact 31 can be inserted into the first contact box 21, and the outgoing contact 32 can be inserted into the second contact box 22. Specifically, the first contact box 21 is provided with a first stationary contact 211, and the second contact box 22 is provided with a second stationary contact 221. The busbar contact 31 is connected to the first stationary contact 211, and the outgoing contact 32 is connected to the second stationary contact 221.

[0047] Further, see Figure 3 and Figure 4The handcart compartment has a sliding door 11 and crank arms 12 on the side near the main busbar compartment and cable compartment. Two crank arms 12 are located on either side of the sliding door 11 and can move the sliding door 11 to expose or block the first contact box 21 and the second contact box 22. The crank arms 12 are bent outwards by 25mm. Furthermore, the cabinet 10 also includes a connecting plate 13. One end of the connecting plate 13 is connected to the crank arm 12, and the other end is connected to the sliding door 11. The connecting plate 13 is tilted upwards by 25mm to increase the insulating air gap. Specifically, the bottom of the handcart compartment is a sliding plate. One end of the crank arm 12 is hinged to the sliding plate, and the other end is hinged to the connecting plate 13. The other end of the connecting plate 13 is hinged to the sliding door 11. Specifically, a slide rail 18 is provided on the side of the handcart compartment near the main busbar compartment and cable compartment, and the sliding door 11 is slidably connected to the slide rail 18. Specifically, there are two sliding doors 11. A crank arm 12 and a connecting plate 13 form a set of driving components. Each sliding door 11 is connected to its two sides by a set of driving components. The two sliding doors 11 can move towards or away from each other. The two sliding doors 11 are vulcanized to increase their rigidity. Furthermore, a limit screw 19 is provided in the handcart compartment to limit the sliding position of the two sliding doors 11, so that the two sliding doors 11 can always be located at the center of the first contact box 21 and the second contact box 22, avoiding the error of ineffective blocking due to excessive sliding and avoiding safety hazards.

[0048] Specifically, the trolley's push stroke is 230mm, and the distance between the two sliding doors 11 is 310mm. During operation, the third cabinet door 16 is opened, and the vacuum circuit breaker 30 is pushed into the trolley compartment using the trolley. The third cabinet door 16 is then closed, and the rotating shaft is used to move the sliding plate away from the third cabinet door 16. This movement of the sliding plate causes the crank arm 12 and connecting plate 13 to change angle, simultaneously opening the sliding door 11. This facilitates the insertion of the busbar contact 31 into the first contact box 21 and the outgoing contact 32 into the second contact box 22. It should be noted that since the use of a trolley to transport the vacuum circuit breaker 30 and the movement of the sliding plate and sliding door 11 within the trolley compartment are existing technologies, their structure and working principle will not be described in detail here.

[0049] Further, see Figure 6The vacuum circuit breaker 30 also includes a solid-sealed pole 33 and an arc-extinguishing chamber 34. The solid-sealed pole 33 has an internal cavity, and the arc-extinguishing chamber 34 is located within the cavity. Specifically, an epoxy resin layer is provided between the solid-sealed pole 33 and the arc-extinguishing chamber 34 to meet the requirement of large breaking capacity with small current. In the prior art, the vacuum arc-extinguishing chamber needs to be installed separately on a metal bracket, and an air insulation gap (typically ≥150mm) needs to be reserved around it. In this embodiment, the solid-sealed pole 33 uses an epoxy resin vacuum casting process to completely encapsulate the arc-extinguishing chamber 34, forming a single insulator, eliminating redundant gaps between components and achieving a compact layout. Furthermore, the vacuum circuit breaker 30 also includes an upper stationary outlet base 35 and a moving outlet base 36. The upper stationary outlet base 35 is located at one end of the arc-extinguishing chamber 34 and is connected to the busbar contact 31. A conductive clamp is located at the other end of the arc-extinguishing chamber 34 and is flexibly connected to the moving outlet base 36 and the outlet contact 32. The busbar contact 31 and the outlet contact 32 are equipped with staggered contacts 311, which are respectively connected to the first stationary contact 211 and the second stationary contact 221 to connect the conductive circuit, thereby realizing the opening and closing of the vacuum circuit breaker 30. Specifically, the mechanical life of the vacuum circuit breaker 30 is up to 20,000 cycles, and the full-capacity breaking capacity can reach 30 cycles.

[0050] Specifically, the solid-sealed terminal 33 has a width of 170mm, an overall height of 541mm, a contact 32 at a height of 180mm from the slide plate, and a distance of 310mm between the breaks. Specifically, the mounting surface of the solid-sealed terminal 33 has an M18 single hole. Specifically, the solid-sealed terminal 33 is rust-red in color, with a smooth surface free of dark lines and uniform casting without shrinkage cavities. The solid-sealed terminal 33 has minimal porosity and stress concentration, with a partial discharge value of less than 5pC, meeting the requirements of a current of 1250A, a breaking capacity of 50kA, and internal and external insulation.

[0051] By setting the total width of the cabinet 10 to 800mm and placing the arc-extinguishing chamber 34 inside the solid-sealed pole 33, the volume of the cabinet 10 is reduced. At the same time, the crank arms 12 on both sides of the sliding door 11 are bent outward by 25mm to increase the air clearance between the crank arms 12 and the vacuum circuit breaker 30, thereby increasing the insulation margin of the vacuum circuit breaker 30. This reduces the land occupation of the high-voltage switchgear without affecting the safety of the vacuum circuit breaker 30.

[0052] Furthermore, the high-voltage switchgear also includes a busbar assembly 40, which includes a main busbar 41, a busbar bushing 42, an upper branch busbar 43, and a lower branch busbar 44. The busbar bushing 42 is installed through the side wall of the main busbar compartment. The main busbar 41 extends into the main busbar compartment through the busbar bushing 42 and connects to the upper branch busbar 43. The upper branch busbar 43 extends into the first contact box 21 and connects to the first stationary contact 211. The lower branch busbar 44 is located in the cable compartment and one end extends into the second contact box 22 and connects to the second stationary contact 221. Specifically, the first contact box 21, the second contact box 22, and the busbar bushing 42 are all 15kV products, meeting the creepage distance requirements, and the partial discharge value of the entire cabinet meets the requirement of less than 50pC for high-quality products. Specifically, the upper branch busbar 43 is connected to the first stationary contact 211, and the lower branch busbar 44 is connected to the second stationary contact 221, all using stainless steel screws. In this embodiment, the width of the upper busbar 43 and the lower busbar 44 is 60mm, the width of the cabinet 10 is 800mm, and the phase spacing is 210mm. Therefore, the high-voltage switchgear meets the requirement of 150mm air clearance for 15kV.

[0053] Furthermore, the high-voltage switchgear also includes an insulation assembly 50, which includes a main busbar support insulator 51 and an upper branch busbar support insulator 52. The main busbar support insulator 51 fixes the main busbar 41 to the main busbar compartment, and the upper branch busbar support insulator 52 fixes the upper branch busbar 43 to the main busbar compartment. In this embodiment, the upper branch busbar support insulator 52 meets the 50kA dynamic and thermal stability requirement.

[0054] Furthermore, the high-voltage switchgear also includes a post-mounted instrument transformer 60, which is located in the cable room and connected to the other end of the lower busbar 44 for easy maintenance. Furthermore, the high-voltage switchgear also includes a grounding switch 70, located in the cable room and connected to the post-mounted instrument transformer 60. Specifically, both the grounding switch 70 and the post-mounted instrument transformer 60 are 15kV products, meeting the requirements for 50kA / 4S thermal stability and 125kA dynamic stability. Specifically, the high-voltage switchgear also includes a cable splice bar 90, located between the post-mounted instrument transformer 60 and the grounding switch 70, to realize the cable outgoing scheme.

[0055] Further, see Figure 5The high-voltage switchgear also includes a transmission assembly 80, which is horizontally disposed within the cable chamber. The transmission assembly 80 includes an operating shaft 81, a drive bevel gear 82, and a main bevel gear 83. The operating shaft 81 is connected to the drive bevel gear 82, and the drive bevel gear 82 meshes with the main bevel gear 83. The grounding switch 70 includes a transmission shaft 71, which is located at the axis of the main bevel gear 83. Rotation of the operating shaft 81 drives the transmission shaft 71 to rotate, thereby closing or opening the grounding switch 70. Specifically, the operating end of the operating shaft 81 is hexagonal for easy manual operation. The transmission assembly 80 also includes a fixing plate, through which the drive bevel gear 82 is fixed to the cable chamber. A pin is provided between the transmission shaft 71 and the main bevel gear 83 to prevent the transmission shaft 71 from shifting.

[0056] Furthermore, the cable compartment includes a first cabinet door 14, and the transmission assembly 80 also includes a driven bevel gear 84, which forms an interlocking relationship with the first cabinet door 14. Specifically, rotating the operating shaft 81 opens and closes the grounding switch 70. When the first cabinet door 14 is not closed, the driven bevel gear 84 cannot rotate, and the grounding switch 70 cannot complete the opening. It should be noted that setting an interlocking relationship between the grounding switch 70 and the cabinet door is a method used in existing high-voltage switchgear, and its structure and working principle will not be described in detail here.

[0057] Furthermore, the instrument compartment is equipped with a panel, and the vacuum circuit breaker 30 can be connected to the socket of the high-voltage switchgear via the aviation plug on the panel to connect the power supply of the secondary opening and closing circuit and the energy storage circuit, thereby realizing the on and off functions of the vacuum circuit breaker 30.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A high-voltage switchgear, characterized in that, include: Cabinet (10), the cabinet (10) includes an instrument room, a handcart room, a cable room and a main busbar room, and the total width of the cabinet (10) is 800mm; The contact assembly (20) includes a first contact box (21) and a second contact box (22), wherein the first contact box (21) is located in the main busbar compartment and the second contact box (22) is located in the cable compartment. A vacuum circuit breaker (30) is installed in the handcart compartment. The vacuum circuit breaker (30) includes a busbar contact (31) and an outgoing contact (32). The busbar contact (31) can be inserted into the first contact box (21), and the outgoing contact (32) can be inserted into the second contact box (22). A sliding door (11) and a crank arm (12) are provided on the side of the handcart compartment near the main busbar compartment and the cable compartment. Two crank arms (12) are provided on both sides of the sliding door (11) and can drive the sliding door (11) to move and expose or block the first contact box (21) and the second contact box (22). The crank arms (12) are bent outward by 25mm. The vacuum circuit breaker (30) also includes a solid-sealed pole (33) and an arc-extinguishing chamber (34). The solid-sealed pole (33) has a cavity inside, and the arc-extinguishing chamber (34) is located in the cavity.

2. The high-voltage switchgear according to claim 1, characterized in that, The cabinet (10) also includes a connecting plate (13), one end of which is connected to the crank arm (12) and the other end is connected to the sliding door (11). The connecting plate (13) is tilted upward and raised by 25mm.

3. The high-voltage switchgear according to claim 1, characterized in that, An epoxy resin layer is provided between the solid-sealing pole (33) and the arc-extinguishing chamber (34).

4. The high-voltage switchgear according to claim 1, characterized in that, The first contact box (21) is provided with a first stationary contact (211), the second contact box (22) is provided with a second stationary contact (221), the bus contact (31) is connected to the first stationary contact (211), and the outgoing contact (32) is connected to the second stationary contact (221).

5. The high-voltage switchgear according to claim 4, characterized in that, The high-voltage switchgear also includes a busbar assembly (40), which includes a main busbar (41), a busbar bushing (42), an upper branch busbar (43), and a lower branch busbar (44). The busbar bushing (42) is installed through the side wall of the main busbar compartment. The main busbar (41) extends into the main busbar compartment through the busbar bushing (42) and is connected to the upper branch busbar (43). The upper branch busbar (43) extends into the first contact box (21) and is connected to the first stationary contact (211). The lower branch busbar (44) is located in the cable compartment and one end extends into the second contact box (22) and is connected to the second stationary contact (221).

6. The high-voltage switchgear according to claim 5, characterized in that, The high-voltage switchgear also includes an insulation component (50), which includes a main busbar support insulator (51) and an upper branch busbar support insulator (52). The main busbar support insulator (51) fixes the main busbar (41) to the main busbar compartment, and the upper branch busbar support insulator (52) fixes the upper branch busbar (43) to the main busbar compartment.

7. The high-voltage switchgear according to claim 5, characterized in that, The high-voltage switchgear also includes a post-mounted instrument transformer (60), which is located in the cable room and is connected to the other end of the lower busbar (44).

8. The high-voltage switchgear according to claim 7, characterized in that, The high-voltage switchgear also includes a grounding switch (70), which is located in the cable room and is connected to the post-mounted instrument transformer (60).

9. The high-voltage switchgear according to claim 8, characterized in that, The high-voltage switchgear also includes a transmission assembly (80), which is arranged horizontally in the cable chamber. The transmission assembly (80) includes an operating shaft (81), a drive bevel gear (82), and a main bevel gear (83). The operating shaft (81) is connected to the drive bevel gear (82), and the drive bevel gear (82) meshes with the main bevel gear (83). The grounding switch (70) includes a transmission shaft (71), which is located at the axis of the main bevel gear (83). The rotation of the operating shaft (81) drives the transmission shaft (71) to rotate, so that the grounding switch (70) is closed or opened.

10. The high-voltage switchgear according to claim 9, characterized in that, The cable compartment includes a first cabinet door (14), and the transmission assembly (80) further includes a driven bevel gear (84), which forms a locking relationship with the first cabinet door (14).

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