Gas insulation load switch cabinet

Abstract

The utility model discloses a gas insulated load switch cabinet, which comprises a cabinet body and a three-position load switch mechanism, the cabinet body comprises a gas tank, the three-position load switch mechanism is arranged in the gas tank, the three-position load switch comprises a three-position load switch frame, the three-position load switch frame is fixedly connected with the gas tank, and the gas tank is fixedly connected with the three-position load switch frame. The three-position load switch frame comprises an insulating upper cross beam and an insulating lower cross beam, and the insulating upper cross beam and the insulating lower cross beam are respectively provided with a plurality of cross beam slotted holes. Parts such as insulators used for isolating metal frames with different potentials from conductors can be removed, the height of the three-position load switch in the vertical direction can be reduced, the overall size of the gas tank can be reduced, and production and manufacturing are facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of electrical technology and relates to a gas insulation load switch cabinet. Background Art

[0002] With the continuous improvement of people's lives and national economic levels, various household appliances are in full bloom, and various new medium and large enterprises are also established in line with market demand, resulting in a sharp increase in market demand for electricity. Faced with such a large demand for electricity, how to safely and reliably control and transmit has become the top priority of the power transmission and distribution industry. Therefore, as an important power control unit, the switch cabinet is particularly important. For this reason, it is necessary to develop a medium-voltage gas-insulated ring main unit product that meets market demand. Gas insulation technology uses insulating gas as the insulating medium of power equipment. It selects suitable insulating gas and constructs a gas insulation system to ensure the safe operation of power equipment. This technology has the advantages of high insulation performance, no environmental impact, light size and high reliability. It is widely used in high-voltage power systems, industrial equipment and high-voltage test laboratories.

[0003] There are several problems with the existing cabinets: the first is the insulation problem, discharge inside the cabinet, and insufficient insulation size; the second is the rebound of the load switch knife when opening and closing. The serious rebound of the load switch leads to the instability of the conductive contact surface. Summary of the invention

[0004] In order to overcome at least one deficiency of the prior art, the utility model provides a gas-insulated load switch cabinet.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a gas insulated load switch cabinet, including a cabinet body and a three-position load switch mechanism, the cabinet body includes a gas box, the three-position load switch mechanism is arranged in the gas box, the three-position load switch includes a three-position load switch frame, the three-position load switch frame is fixedly connected to the gas box, the three-position load switch frame includes an insulating upper beam and an insulating lower beam, and the insulating upper beam and the insulating lower beam are respectively provided with a plurality of beam slots.

[0006] Furthermore, the air box includes a front plate, a rear plate, an upper top plate, a lower top plate and two groups of side plates, and the spacing between the two groups of side plates is smaller than the width of the front plate, the rear plate, the upper top plate and the lower top plate.

[0007] Furthermore, the three-position load switch also includes a three-position load switch main shaft, which is connected to the three-position mechanism and the three-position load switch frame through a dynamic sealing device, and a steel sleeve is provided between the three-position load switch main shaft and the dynamic sealing device.

[0008] Furthermore, the three-position load switch also includes a buffer device, a three-position load switch transmission component, and a three-position load switch moving knife. The buffer device includes a main shaft buffer structure and a moving knife pull plate. The main shaft buffer structure is arranged on the main shaft of the three-position load switch. The three-position load switch transmission component is connected to the three-position load switch moving knife through the moving knife pull plate, and the three-position load switch transmission component is connected to the three-position load switch main shaft.

[0009] Furthermore, the moving knife of the three-position load switch is arranged on the insulating lower cross beam, and the insulating lower cross beam is fixed with a moving knife seat. One end of the moving knife of the three-position load switch is rotatably connected to the moving knife seat, and the other end of the moving knife of the three-position load switch is set as a free end, and the free end is provided with a moving knife shielding cover, and the shape of the moving knife shielding cover is smooth.

[0010] Furthermore, the three-position load switch also includes an arc-extinguishing magnet, which is fixed to the free end of the moving knife of the three-position load switch and is located inside the moving knife shielding cover.

[0011] Furthermore, the movable knife seat is provided with a movable knife seat shielding cover, which is fixed on the insulating lower cross beam, and the movable knife seat shielding cover has a smooth appearance.

[0012] Furthermore, the three-position load switch also includes a contact assembly, the contact assembly includes a grounding static contact and a load static contact, the three-position load switch frame is provided with a three-position load switch grounding beam, the three-position load switch grounding beam is provided with a grounding bus, the grounding static contact is fixed on the grounding bus, and the load static contact is fixed on the insulating upper beam.

[0013] Furthermore, the load static contact is provided with a load static contact shielding cover, which is fixed on the insulating upper cross beam, and the load static contact shielding cover has a smooth appearance.

[0014] Furthermore, it also includes a grounding copper busbar mechanism, the cabinet includes a cable room and a pressure relief chamber, the grounding copper busbar mechanism includes a grounding nut, and the grounding copper busbar mechanism is distributed along the gas box, the pressure relief chamber and the cable room through the grounding nut.

[0015] In summary, the utility model is beneficial in that:

[0016] 1) The utility model directly installs the load static contact in the closing position. When the movable knife of the three-position load switch moves to the closing position, it closes with the load static contact, and uses an arc extinguishing magnet to replace the arc extinguishing deletion structure of the existing three-position load switch. The arc is extinguished by magnetic blowing through the arc extinguishing magnet, and the arc is elongated by the magnetic force of the arc extinguishing magnet, so that the arc is cooled and deionized, thereby achieving the purpose of extinguishing the arc, eliminating the arc extinguishing grid, enhancing the overall insulation performance, and reducing the risk of phenomena such as breakdown of the gas insulation gap. In addition, the load static contact is provided with a load static contact shielding cover, the movable knife seat is provided with a movable knife seat shielding cover, and the movable knife is provided with a movable knife shielding cover. The appearance of each shielding cover is smooth, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the three-position load switch, thereby greatly improving the insulation performance of the three-position load switch and meeting the requirements of 40.5kV circuit breakers.

[0017] 2) The insulating upper beam and the insulating lower beam of the utility model are part of the three-position load switch frame and are provided with a plurality of beam slots, which can remove components such as insulators used to isolate metal frames of different potentials from conductors, which is beneficial to compressing the height of the three-position load switch in the vertical direction, can reduce the overall volume of the gas box, and is beneficial to production and manufacturing.

[0018] 3) The utility model effectively avoids the situation in which the moving knife of the three-position load switch is over-positioned when closing or not moving in place when grounding, resulting in poor contact with the static contact, through the buffer device.

[0019] 4) A steel sleeve is provided between the main shaft of the three-position load switch of the utility model and the dynamic sealing device, and the transmission clearance between the dynamic sealing device and the main shaft of the three-position load switch is reduced by the steel sleeve, and at the same time, the wear of the main shaft of the three-position load switch is reduced after the three-position load switch is actuated for a certain number of times.

[0020] 5) The grounding copper bar mechanism of the utility model is distributed along the gas box, the pressure relief chamber and the cable chamber through the grounding nut to enhance the ability of the grounding to carry the fault current of the loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a gas-insulated load switch cabinet of the utility model.

[0022] Figure 2 This is a schematic diagram of the interior of the gas-insulated load switch cabinet of the utility model.

[0023] Figure 3 It is a schematic diagram of the air box of the utility model.

[0024] Figure 4 It is a cross-sectional view of the air box of the utility model.

[0025] Figure 5 For this utility model Figure 4 A is an enlarged schematic diagram.

[0026] Figure 6 For this utility model Figure 4 A magnified schematic diagram of B.

[0027] Figure 7 This is a schematic diagram of a three-position load switch of the utility model.

[0028] Figure 8 This is a schematic diagram of a three-position load switch of the utility model.

[0029] Fig. 9 It is a schematic diagram of the grounding static contact of the utility model.

[0030] Fig.10 The utility model is a schematic diagram of the assembly of the transmission component and the movable knife of the three-position load switch.

[0031] Fig.11 For the utility model Fig.10 Schematic diagram of the decomposition.

[0032] Fig.12 It is a schematic diagram of the movable knife and pull plate of the utility model.

[0033] Fig.13 This is a schematic diagram of the closed state of the three-position load switch of the utility model.

[0034] Fig.14 It is a schematic diagram of the three-position load switch of the utility model in the open state.

[0035] Fig.15 This is a schematic diagram of the grounding state of the three-position load switch of the utility model.

[0036] Fig.16 It is a schematic diagram of the grounding copper bar mechanism of the utility model.

[0037] Fig.17 It is a schematic diagram of the connection between the grounding copper bar mechanism and the partition of the utility model.

[0038] Symbols in the figure: cabinet 1, three-position load switch 4, grounding copper bar mechanism 5, dynamic sealing device 8, operating room 11, cable room 12, gas box 13, pressure relief chamber 14, three-position load switch main shaft 40, three-position load switch frame 41, three-position load switch transmission component 42, contact assembly 43, moving knife seat 44, three-position load switch moving knife 48, grounding nut 50, first grounding bar 51, second grounding bar 52, third grounding bar 53, fourth grounding bar 54, fifth grounding bar 55, nut 56, insulating sleeve 61, main busbar 62, steel sleeve 81, three-position load switch frame side plate 411, insulating upper crossbeam 410 The lower crossbeam 412, the crossbeam slot 413, the three-position load switch grounding crossbeam 414, the grounding bar 415, the limit piece 420, the transmission crank arm 421, the crank arm baffle 422, the movable knife pull rod 423, the limit sleeve 424, the grounding static contact 431, the load static contact 432, the load static contact shielding cover 433, the movable knife seat shielding cover 441, the movable knife shielding cover 481, the spindle buffer structure 491, the movable knife pull plate 492, the input end 493, the output end 494, the protrusion 495, the first end 501, the second end 502, the grounding static contact mounting portion 4311, the grounding mounting hole 4312, and the grounding static contact action portion 4313. DETAILED DESCRIPTION

[0039] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0041] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0043] Embodiment 1:

[0044] like Figure 1-Figure 17 As shown, a gas-insulated load switch cabinet includes a cabinet body 1 and a three-position load switch mechanism. The cabinet body 1 includes an operation room 11, a cable room 12, a gas box 13 and a pressure relief room 14. The three-position load switch mechanism is installed in the gas box 13.

[0045] The operating room 11 is provided with a three-station mechanism (not shown).

[0046] like Figure 1 As described above, a coordinate system is established to facilitate the definition of directions, wherein the x-axis is the width direction of the gas-insulated load switch cabinet, i.e., the front-to-back direction, the y-axis is the length direction of the gas-insulated load switch cabinet, i.e., the left-to-right direction, and the z-axis is the height direction of the gas-insulated load switch cabinet, i.e., the up-down direction.

[0047] The air box 13 is configured as a box structure assembled from a number of plates, the width direction of the air box 13 is the x-axis direction in the figure, the air box 13 includes a front plate 131, a rear plate 132, an upper top plate 133, a lower top plate 134 and two groups of side plates 135, the front plate 131 and the rear plate 132 are parallelly distributed in the y-axis direction, the two groups of side plates 135 are parallelly distributed in the x-axis direction, the upper top plate 133 and the lower top plate 134 are parallelly distributed in the z-axis direction, in this embodiment, the front plate 131 is connected to the operating room 11, and the lower top plate 134 is connected to the cable room 12, thereby constituting an assembly of the air box 13 with the operating room 11, the cable room 12 and the pressure relief chamber 14.

[0048] The spacing between the two groups of side panels 135 in the x-axis direction is smaller than the width of the front panel 131, the rear panel 132, the upper top panel 133 and the lower top panel 134 in the x-axis direction, so that the intersection of the side panels 135 and the front panel 131, the rear panel 132, the upper top panel 133 and the lower top panel 134 is retracted, so that the side panels 135 and the front panel 131, the rear panel 132, the upper top panel 133 and the lower top panel 134 form a concave cavity 136, and the weld scar generated when the fillet welding is performed at the intersection is located in the cavity 136. When the gas boxes 13 are connected in cabinets, the front panels 131, the rear panels 132, the upper top panel 133 and the lower top panel 134 of different gas boxes 13 can be connected in cabinets, thereby avoiding the influence of weld scars on the connection of gas boxes, facilitating the connection of gas boxes and improving the neatness of the connection of gas boxes.

[0049] The width of the air box 13 is the distance between the two sets of side panels 135 in the x-axis direction. The width of the air box 13 is the same as the width of the cabinet 1, thereby ensuring the insulation safety distance to the maximum extent.

[0050] In this embodiment, the workstation load switch mechanism includes a three-phase three-station load switch unit, and the three-phase three-station load switch units are arranged side by side. The three-station load switch unit includes a three-station load switch 4. The three-phase three-station load switch units have the same structure. One of the three-station load switch units is used as an example for illustration below.

[0051] The three-position load switch 4 includes a three-position load switch frame 41 and a three-position load switch main shaft 40. The three-position load switch main shaft 40 penetrates the three-position load switch frame 41 and extends to the operating room 11 to be connected with the three-position mechanism. The three-position load switch main shaft 40 is connected with the three-position mechanism and the three-position load switch frame 41 through a dynamic sealing device 8. A steel sleeve 81 is provided between the three-position load switch main shaft 40 and the dynamic sealing device 8. The steel sleeve 81 reduces the transmission clearance between the dynamic sealing device 8 and the three-position load switch main shaft 40, and at the same time reduces the wear of the three-position load switch main shaft 40 after the three-position load switch 4 is actuated a certain number of times.

[0052] The main shaft 40 of the three-position load switch is set as a hexagonal shaft structure, and the steel sleeve 81 adopts an adaptive hexagonal steel sleeve.

[0053] The three-position load switch frame 41 is fixedly connected to the gas box 13. The three-position load switch frame 41 includes a three-position load switch frame side plate 411, an insulating upper crossbeam 410, and an insulating lower crossbeam 412. The insulating upper crossbeam 410 and the insulating lower crossbeam 412 are respectively fixedly connected to two groups of three-position load switch frame side plates 411, and the insulating upper crossbeam 410 and the insulating lower crossbeam 412 are arranged in parallel.

[0054] according to Figure 7 From a visual perspective, the two groups of three-station load switch frame side plates 411 are distributed along the y-axis and are arranged parallel to the length direction of the insulating lower cross beam 412.

[0055] The insulating upper beam 410 and the insulating lower beam 412 are respectively provided with a plurality of beam slots 413, and the beam slots 413 are long strip structures. The beam slots 413 increase the creepage distance and optimize the electric field distribution. In the present application, the insulating upper beam 410 and the insulating lower beam 412 are part of the three-position load switch frame 41 and are provided with a plurality of beam slots 413. Insulators and other components used to isolate metal frames of different potentials from conductors can be removed, which is beneficial to compressing the height of the three-position load switch in the vertical direction and reducing the occupied volume of the load switch cabinet.

[0056] Preferably, a plurality of beam slots 413 are distributed in an array along the length direction in the middle and on both sides of the insulating upper beam 410 and the insulating lower beam 412 , and the length direction of the beam slots 413 is perpendicular to the length direction of the insulating upper beam 410 and the insulating lower beam 412 .

[0057] A three-station load switch grounding beam 414 is fixedly arranged between the two groups of three-station load switch frame side plates 411 , and a grounding bar 415 is fixedly arranged along the length of the three-station load switch grounding beam 414 .

[0058] The three-position load switch 4 also includes a buffer device, a three-position load switch transmission component 42, and a three-position load switch moving knife 48. The buffer device includes a main shaft buffer structure 491 and a moving knife pull plate 492. The main shaft buffer structure 491 is arranged on the three-position load switch main shaft 40. The three-position load switch transmission component 42 is connected to the three-position load switch moving knife 48 through the moving knife pull plate 492. The three-position load switch transmission component 42 is connected to the three-position load switch main shaft 40. The three-position load switch main shaft 40 transmits the movement of the three-position mechanism to the three-position load switch transmission component 42, so as to realize the opening, closing and grounding operations of the three-position load switch 4. Fig.13 As shown, when the three-position load switch 4 is closed, the main shaft buffer structure 491 and the movable knife pull plate 492 are against each other for buffering. When the switch is closed, the main shaft buffer structure 491 and the movable knife pull plate 492 collide with each other. The main shaft buffer structure 491 absorbs part of the kinetic energy and prevents the movable knife 48 of the three-position load switch from over-closing. Fig.15 As shown, when the three-position load switch 4 is grounded, the three-position load switch transmission component 42 controls the three-position load switch moving knife 48 in the grounding position through the moving knife pull plate 492. During the grounding action, the power generated by the rotation of the three-position load switch moving knife 48 is partially absorbed by the passive knife pull plate 492, thereby reducing the impact caused by the three-position load switch moving knife 48 moving to the grounding position, avoiding the occurrence of poor contact between the three-position load switch moving knife 48 and the grounding static contact caused by the rebound of the three-position load switch moving knife 48 during the grounding action.

[0059] Preferably, the main shaft buffer structure 491 adopts a buffer pad.

[0060] The movable knife pull plate 492 includes an input end 493 and an output end 494. The output end 494 is rotatably connected to the middle part of the movable knife 48 of the three-position load switch, and the input end 493 is rotatably connected to the three-position load switch transmission component 42. The input end 493 is provided with a protrusion 495, which faces the main shaft buffer structure 491 and collides with the main shaft buffer structure 491 when the switch is in the closed state.

[0061] The present application uses a buffer device to effectively prevent the movable knife 48 of the three-position load switch from being over-positioned when closing or not moving in place when grounding, resulting in poor contact with the static contact. At the same time, the present application sets the main shaft buffer structure 491 on the main shaft 40 of the three-position load switch, and the movable knife pull plate 492 is set in the middle of the movable knife 48 of the three-position load switch. Compared with the existing method of setting the buffer device at the rear end of the load static contact 432 to limit the final position, the present embodiment absorbs the kinetic energy generated by the movable knife 48 of the three-position load switch during the closing and grounding actions through the buffer device, so as to prevent the movable knife 48 of the three-position load switch from being over-positioned when closing. Or the grounding action is not in place and the contact with the static contact is poor, which effectively improves the action stability and reliability; to meet the needs of 40.5kV circuit breakers, the three-position load switch moving knife 48 needs to be increased in length to obtain a stronger driving force and at the same time have a stronger impact force. The present application can absorb the kinetic energy generated by the three-position load switch moving knife 48 during the closing and grounding action switching through a buffer device, which can reduce the stress on components, improve the mechanical transmission efficiency, and ensure the reliability of the isolated switch state switching, so that the three-position load switch meets the gas-insulated vacuum load switch cabinet with a rated voltage of 40.5kV.

[0062] The three-position load switch transmission component 42 includes a transmission crank arm 421 and a moving knife pull rod 423. One end of the transmission crank arm 421 is rotatably connected to one end of the moving knife pull rod 423, and the other end is fixedly connected to the three-position load switch main shaft 40. The other end of the moving knife pull rod 423 is rotatably connected to the moving knife pull plate 492. The three-position load switch main shaft 40 transmits power to the three-position load switch moving knife 48 through the three-position load switch transmission component 42.

[0063] There are two groups of transmission crank arms 421 and movable knife pull rods 423 respectively, and the two groups of transmission crank arms 421 and movable knife pull rods 423 are fixedly connected by pins to achieve synchronous movement.

[0064] A crank arm baffle 422 is also provided on the outside of the two sets of transmission crank arms 421. The crank arm baffle 422 is set on the three-position load switch main shaft 40. A limit member 420 is also provided on the outside of the crank arm baffle 422. The limit member 420 is fixed on the three-position load switch main shaft 40 and limits it on both sides of the crank arm baffle 422, so that the transmission crank arm 421 is stably fixed on the three-position load switch main shaft 40.

[0065] Preferably, the stopper 420 is a fastener such as a screw or a bolt;

[0066] Preferably, the limiting member 420 is made of non-metallic material, such as reinforced nylon.

[0067] The spindle buffer structure 491 is arranged between the two sets of transmission crank arms 421 , the movable knife pull plate 492 is located between the two sets of movable knife pull rods 423 , and a limiting sleeve 424 is further arranged between the movable knife pull plate 492 and the two sets of movable knife pull rods 423 .

[0068] The moving knife 48 of the three-position load switch is arranged on the insulating lower cross beam 412, and the moving knife seat 44 is fixedly provided on the insulating lower cross beam 412. One end of the moving knife 48 of the three-position load switch is rotatably connected to the moving knife seat 44, and the other end of the moving knife 48 of the three-position load switch is set as a free end, and a moving knife shielding cover 481 is provided at the free end. The moving knife shielding cover 481 has a smooth shape, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the three-position load switch 4.

[0069] The three-position load switch 4 also includes an arc extinguishing magnet 49, which is fixed at the free end of the moving knife 48 of the three-position load switch and is located inside the moving knife shielding cover 481. The present application uses the arc extinguishing magnet 49 to replace the arc extinguishing structure of the existing three-position load switch 4. The three-position load switch 4 of the present application performs magnetic blowing to extinguish the arc through the arc extinguishing magnet 49, and the arc is elongated by the magnetic force of the arc extinguishing magnet 49, so that the arc is cooled and deionized, thereby achieving the purpose of extinguishing the arc.

[0070] The movable knife 48 of the three-position load switch can rotate around the rotation center of the movable knife 48 of the three-position load switch. The rotation center of the movable knife 48 of the three-position load switch is close to the main shaft 40 of the three-position load switch. Compared with the existing three-position load switch movable knife, this embodiment shortens the relative distance between the rotation center of the movable knife 48 of the three-position load switch and the main shaft 40 of the three-position load switch. Under the premise of ensuring sufficient safety insulation gap, redundant volume is eliminated. The relative distances of different types of cabinets are different and can be set according to actual conditions.

[0071] The fixed stud of the movable knife seat 44 is provided with a movable knife seat shielding cover 441, which is fixed to the insulating lower cross beam 412. The movable knife seat shielding cover 441 has a smooth shape, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhance the overall insulation performance of the three-position load switch 4.

[0072] The three-position load switch moving knife 48 is connected to the three-position load switch main shaft 40 through the three-position load switch transmission component 42. The three-position load switch main shaft 40 transmits the movement of the three-position mechanism to the three-position load switch moving knife 48 through the three-position load switch transmission component 42. The three-position load switch moving knife 48 switches the grounding, isolation or closing position, thereby realizing the grounding, opening and closing states of the three-position load switch 4.

[0073] The three-position load switch 4 also includes a contact assembly 43, which includes a grounding static contact 431 and a load static contact 432. The grounding static contact 431 is fixed on the grounding bar 415, and the load static contact 432 is fixed on the insulating upper beam 410. When the moving knife 48 of the three-position load switch moves to the closing position, it closes with the load static contact 432 to close the switch. When the moving knife 48 of the three-position load switch moves to the grounding position, it closes with the grounding static contact 431 to ground the switch.

[0074] In the present application, the load static contact 432 is directly installed in the closing position. When the three-position load switch moving knife 48 moves to the closing position, it closes with the load static contact 432, eliminating the arc extinguishing grid frame, enhancing the overall insulation performance, and reducing the risk of phenomena such as breakdown of the gas insulation gap.

[0075] The load static contact 432 is provided with a load static contact shielding cover 433, which is fixed on the insulating upper beam 410. The load static contact shielding cover 433 has a smooth shape, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the three-position load switch 4.

[0076] The load static contact 432 overlaps the main busbar 62 , and the main busbar 62 is connected to the insulating sleeve 61 .

[0077] The grounding static contact 431 includes a grounding static contact mounting portion 4311 and a grounding static contact action portion 4313 . The grounding static contact mounting portion 4311 is fixedly connected to the grounding bar 415 , and the grounding static contact action portion 4313 is connected to or separated from the movable knife 48 of the three-position load switch.

[0078] The grounding static contact mounting portion 4311 and the grounding static contact action portion 4313 are vertically connected to form a T-shaped structure. Preferably, the grounding static contact action portion 4313 is located in the middle of the grounding static contact mounting portion 4311, and grounding mounting holes 4312 for installation are provided on both sides of the grounding static contact mounting portion 4311.

[0079] In this embodiment, the three-position load switch 4 can be used alone in existing equipment. The unexplained structure of the three-position load switch 4 adopts existing components and will not be described in detail here.

[0080] The gas-insulated load switch cabinet further comprises a grounding copper bar mechanism 5 , which comprises a grounding nut 50 . The grounding copper bar mechanism 5 is distributed along the gas box 12 , the pressure relief chamber 14 and the cable chamber 12 through the grounding nut 50 .

[0081] The grounding copper bar mechanism 5 also includes a first grounding bar 51, a second grounding bar 52, a third grounding bar 53, a fourth grounding bar 54 and a fifth grounding bar 55. The first grounding bar 51 is located in the gas box 13 and overlaps with the grounding bar 415. The second grounding bar 52 is located in the pressure relief chamber 14. The first grounding bar 51 and the second grounding bar 52 are connected by a grounding nut 50. The fourth grounding bar 54 is located in the cable chamber 12. The third grounding bar 53 spans the pressure relief chamber 14 and the cable chamber 12 and overlaps with the second grounding bar 52 and the fourth grounding bar 54 respectively. One end of the fifth grounding bar 55 overlaps with the fourth grounding bar 54, and the other end extends to the outside of the load switch cabinet for cabinet connection. The grounding copper bar mechanism 5 of the present application is distributed along the gas box 12, the pressure relief chamber 14 and the cable chamber 12 through the grounding nut 50 to enhance the ability of the grounding to carry the fault current of the loop.

[0082] The grounding nut 50 is fixedly mounted on the partition between the air box 13 and the pressure relief chamber 14, and is used to connect the first grounding bar 51 located in the air box 13 and the second grounding bar 52 located in the pressure relief chamber 14. Specifically, the grounding nut 50 includes a first end 501 and a second end 502. The first end 501 and the second end 502 are fixedly connected. The outer diameter of the first end 501 is smaller than the outer diameter of the second end 502. The first end 501 is fastened with a nut 56, so that the grounding nut 50 is fastened to the partition between the air box 13 and the pressure relief chamber 14. The first end 501 is located in the air box 13 and is connected to the first grounding bar 51, and the second end 502 is located in the pressure relief chamber 14 and is connected to the second grounding bar 52.

[0083] The structures not described in the load switch cabinet in this embodiment use existing components and will not be described in detail here.

[0084] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A gas insulated load switch cabinet, characterized in that: It includes a cabinet body and a three-position load switch mechanism. The cabinet body includes a gas box. The three-position load switch mechanism is arranged in the gas box. The three-position load switch includes a three-position load switch frame. The three-position load switch frame is fixedly connected to the gas box. The three-position load switch frame includes an insulating upper beam and an insulating lower beam. The insulating upper beam and the insulating lower beam are respectively provided with a plurality of beam slots.

2. A gas insulated load switch cabinet according to claim 1, characterized in that: The air box comprises a front plate, a rear plate, an upper top plate, a lower top plate and two groups of side plates, and the spacing between the two groups of side plates is smaller than the width of the front plate, the rear plate, the upper top plate and the lower top plate.

3. A gas insulated load switch cabinet according to claim 1, characterized in that: The three-position load switch also includes a three-position load switch main shaft, which is connected to the three-position mechanism and the three-position load switch frame through a dynamic sealing device, and a steel sleeve is provided between the three-position load switch main shaft and the dynamic sealing device.

4. A gas insulated load switch cabinet according to claim 3, characterized in that: The three-position load switch also includes a buffer device, a three-position load switch transmission component, and a three-position load switch moving knife. The buffer device includes a main shaft buffer structure and a moving knife pull plate. The main shaft buffer structure is arranged on the main shaft of the three-position load switch. The three-position load switch transmission component is connected to the three-position load switch moving knife through the moving knife pull plate, and the three-position load switch transmission component is connected to the three-position load switch main shaft.

5. A gas insulated load switch cabinet according to claim 4, characterized in that: The moving knife of the three-position load switch is arranged on the insulating lower cross beam, and a moving knife seat is fixed on the insulating lower cross beam. One end of the moving knife of the three-position load switch is rotatably connected with the moving knife seat, and the other end of the moving knife of the three-position load switch is arranged as a free end, and a moving knife shielding cover is arranged on the free end, and the shape of the moving knife shielding cover is smooth.

6. A gas insulated load switch cabinet according to claim 5, characterized in that: The three-position load switch also includes an arc extinguishing magnet, which is fixed at the free end of the moving knife of the three-position load switch and is located inside the moving knife shielding cover.

7. The gas insulated load switch cabinet according to claim 5, characterized in that: The movable knife seat is provided with a movable knife seat shielding cover, which is fixed on the insulating lower cross beam and has a smooth appearance.

8. The gas insulated load switch cabinet according to claim 1, characterized in that: The three-position load switch also includes a contact assembly, which includes a grounding static contact and a load static contact. The three-position load switch frame is provided with a three-position load switch grounding beam, and the three-position load switch grounding beam is provided with a grounding bar. The grounding static contact is fixed on the grounding bar, and the load static contact is fixed on the insulating upper beam.

9. A gas insulated load switch cabinet according to claim 8, characterized in that: The load static contact is provided with a load static contact shielding cover, which is fixed on the insulating upper cross beam and has a smooth appearance.

10. The gas insulated load switch cabinet according to claim 1, characterized in that: It also includes a grounding copper busbar mechanism. The cabinet includes a cable chamber and a pressure relief chamber. The grounding copper busbar mechanism includes a grounding nut. The grounding copper busbar mechanism is distributed along the gas box, the pressure relief chamber and the cable chamber through the grounding nut.

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