Gas-insulated switchgear switch with expanded side surface

Abstract

The utility model provides a side-expanded gas-insulated switchgear switch, which comprises a gas tank, a first wiring pipe, a second wiring pipe and a switch assembly arranged in the gas tank, and the second wiring pipe is arranged at the side part of the gas tank; the switch assembly comprises an isolation switch which is driven by the driving shaft to rotate, two ends of the isolation switch are bent, and the two ends of the isolation switch are conductive ends respectively; the solid-sealed polar pole is conductively connected with one end of the first wiring tube; the first isolation contact is arranged on one side of the periphery of the isolation switch, the first isolation contact is conductively connected with the solid-sealed polar pole, and the outer side of the first isolation contact is covered with a first insulation cover; the second isolating contact is arranged on the upper side of the periphery of the isolating switch and is conductively connected with one end of the second wiring pipe, a second insulating cover covers the outer side of the second isolating contact, and the first insulating cover and the second insulating cover are arranged in a way corresponding to the side opening of the autorotation path of the isolating switch; and the grounding contact is arranged on the other side of the periphery of the isolating switch. The vertical moving space of the isolating switch can be reduced, and the vertical height and the manufacturing cost of the gas tank are reduced.

Description

Technical Field

[0001] The utility model relates to the field of gas-insulated switchgear, in particular to a gas-insulated switchgear with side expansion. Background Art

[0002] The gas-insulated switchgear is a very important power distribution equipment in the power system, which is applicable to small secondary substations, switching stations, box-type substations, residential communities, industrial and mining enterprises, large shopping malls in the power system, and is especially applicable to places with high power consumption requirements such as airports, subways, and railways.

[0003] In the existing gas-insulated switchgear, the bushing is generally arranged on the top of the gas tank. In the gas tank, a linear disconnector is used to switch between the three working positions of switch closed position, switch grounding position, and switch open position. For example, in a prior application with the name of an improved electrical switch and the application number of 202410056453.X, the isolating contacts, isolating blades, and pole columns in the gas tank are distributed from top to bottom in sequence. The lower end of the isolating blade is connected to the pole column through a transition conductor, and the upper end swings to conductively connect the disconnector, grounding contact, or suspend to realize the three-position switching. However, such a layout has the following defects: the position of the bushing is relatively high, making it difficult to perform the expansion connection operation between adjacent gas-insulated switchgears, and it will also increase the overall height occupation of the gas-insulated switchgear. Moreover, the vertical moving space of the disconnector is large, resulting in a higher height of the gas tank and a high manufacturing cost of the gas tank.

[0004] Aiming at the problems existing in the above-mentioned prior art, designing a gas-insulated switchgear with side expansion is the purpose of the research of the present utility model. Summary of the Utility Model

[0005] Aiming at the problems existing in the above-mentioned prior art, the present utility model provides a gas-insulated switchgear with side expansion, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the present utility model is as follows:

[0007] A gas-insulated switchgear with side expansion includes: a gas tank, a first wiring pipe and a second wiring pipe whose one end is hermetically penetrated into the gas tank, and a switch assembly arranged in the gas tank. The second wiring pipe is arranged on the side of the gas tank. The switch assembly includes:

[0008] A disconnector, which is rotatably arranged by being driven by a driving shaft. The two ends of the disconnector are bent and are respectively set as conductive ends;

[0009] A solid-sealed pole column, which is conductively connected to one end of the first wiring pipe;

[0010] A first isolating contact, which is arranged on one side of the outer periphery of the disconnector. The first isolating contact is conductively connected to the solid-sealed pole column and is covered with a first insulating cover on the outside;

[0011] A second isolating contact is arranged on the upper side of the outer periphery of the isolating switch and connected to the inner wall of the gas box through an insulating member, the second isolating contact is conductively connected to one end of the second wiring tube through a conductive wire, the end of the insulating member is provided with a cover arranged on the outer side of the second isolating contact, and the first insulating cover and the second insulating cover are arranged to give way to the side opening of the rotation path of the isolating switch;

[0012] The grounding contact is arranged on the other side of the outer periphery of the isolating switch; the isolating switch is used to rotate to the two conductive ends to respectively connect the first isolating contact and the second isolating contact conductively, or respectively connect the first isolating contact and the grounding contact conductively, or be suspended.

[0013] Furthermore, the number of the drive shafts is set to one, and it rotates through one side wall of the air box and then rotates to connect to the brackets arranged on the two opposite inner walls of the air box. The number of the switch assemblies is set to three groups and they are arranged side by side along the length direction of the drive shaft. The bending parts of the isolating switches of the three groups of switch assemblies are arranged side by side and spaced apart on the drive shaft. The sealed poles of the three groups of switch assemblies are respectively set to A-phase poles, B-phase poles and C-phase poles. There are three of each of the first wiring tube and the second wiring tube, and they correspond to the three groups of switch assemblies respectively.

[0014] Furthermore, the sealed pole is transversely arranged on one side of the outer periphery of the isolating switch, the first isolating contact and the first insulating cover are arranged at one end of the sealed pole close to the isolating switch, and a vacuum arc chamber and an insulating pull rod which is driven by an external driving device to move transversely and one end of which is inserted into the moving end of the vacuum arc chamber through a moving end conductor are arranged in sequence inside the sealed pole in a direction away from the first isolating contact; a static end conductor whose one end is conductively connected to the first isolating contact and the other end corresponds to one end of the insulating pull rod is penetrated through the side wall of the static end of the vacuum arc chamber; the moving end conductor is connected to a flexible connection whose one end is linked to the insulating pull rod, and the other end of the flexible connection is conductively connected to one end of the first wiring tube.

[0015] Furthermore, a conductive part is provided in a downwardly protruding bottom of the sealed pole, a connecting conductor is vertically penetrated in the conductive part, the other end of the flexible connection is conductively screwed to the upper end of the connecting conductor, the first wiring tube includes a first sleeve, a first conductor inserted in the first sleeve, and an insulating sleeve sealed and inserted in the conductive part and the upper end of the first sleeve at the upper and lower ends respectively, the upper end of the first sleeve is pressed against the bottom of the air box by a sleeve pressing plate, the lower end is extended downward and then folded horizontally, the upper end of the first sleeve and the air box are sealed by a sealing ring, the upper end of the first conductor is conductively inserted in the jack of the connecting conductor, and the upper end of the first conductor, the insulating sleeve and the sealing ring are distributed in sequence from the inside to the outside.

[0016] Furthermore, the outer layer of the insulating sleeve is set as a semiconductor shielding layer, the upper and lower ends of the insulating sleeve are set as sealing parts whose side wall thickness gradually decreases in opposite directions, the conductive part and the upper end of the first sleeve are respectively provided with sealing holes adapted to the sealing parts, and the middle thickness of the insulating sleeve is laterally expanded to form an insulating part that is arranged between the conductive part and the upper end of the first sleeve.

[0017] Furthermore, the bracket is made of insulating elastic material.

[0018] Furthermore, the second isolating contact, the grounding contact, and the first isolating contact are respectively arranged on the upper side, the rear side, and the front side of the isolating switch; the first insulating cover and the second insulating cover are both set as rectangular shells; the top and rear openings of the first insulating cover are set; the top, bottom, and front openings of the second insulating cover are set; the bottom of the first insulating cover is offset downward to provide a making way for the isolating switch to rotate to the two conductive ends to respectively connect the first isolating contact and the grounding contact conductively.

[0019] Therefore, the utility model provides the following effects and / or advantages:

[0020] 1. By arranging the second wiring tube at the side of the gas box as a busbar bushing, the side extension connection of the busbar bushings between adjacent gas-filled switch cabinets can be realized through a standard busbar connector, thereby improving the convenience of operation and reducing the overall height of the gas-filled cabinet switch. At the same time, the isolating switch is arranged to be driven by the driving shaft to rotate and the conductive ends at both ends are bent, and the first isolating contact, the second isolating contact, and the grounding contact are arranged on the outer periphery of the isolating switch, so that the isolating switch rotates to the switch closed position where the two conductive ends are respectively conductively connected to the first isolating contact and the second isolating contact, or the switch grounding position where the two conductive ends are respectively conductively connected to the first isolating contact and the grounding contact, or the switch open position where the two conductive ends are suspended. Thereby, the straight-type isolating switch is replaced by a bent-type isolating switch, so as to reduce the vertical movable space of the isolating switch, reduce the vertical space inside the gas box required for the installation of the switch assembly, and reduce the vertical height of the gas box and the manufacturing cost; and, since the isolating switch is bent, the distance between the two conductive ends is shortened, which in turn leads to a shortened distance between the first isolating contact and the second isolating contact, which is prone to insulation hazards. Therefore, the first isolating contact and the second isolating contact are respectively insulated and isolated by the first insulating cover and the second insulating cover, so as to reduce the risk of insulation hazards caused by shortened distance.

[0021] 2. By directly conducting electricity through the static end conductor for the first isolating contact at the static end of the vacuum interrupter, there is no need for transfer conductors such as branch busbars to transfer electricity between the first isolating contact and the solid-sealed pole column, further reducing the vertical space inside the gas tank required for installing the switch assembly, lowering the vertical height of the gas tank and manufacturing costs. At the same time, it also reduces the usage amount of copper materials, reduces connection points, lowers the loop resistance, and reduces the dangerous points of insulation breakdown inside the gas tank. Specifically, compared with the conventional gas-insulated switchgear, the height of the gas tank can be reduced by about 50%. The gas tank is a standard cuboid with a simple structure, which is convenient for manufacturing. The usage amount of copper conductors is reduced by more than 20%, enhancing the insulation performance and reducing the product cost.

[0022] 3. The bracket is made of insulating elastic material, so that the bracket has insulating performance and a certain amount of elasticity. Thus, on the basis of supporting the drive shaft through the bracket, the bracket can also play a role in enhancing insulation and making a certain amount of elastic compensation for the deformation of the gas tank.

[0023] 4. Through the cooperation of the bushing pressing plate and the sealing ring, the upper end of the first bushing is hermetically connected to the gas tank. And on the basis of realizing the electrical connection between the first wiring pipe and the solid-sealed pole column through the conductive insertion connection of the first conductor and the moving end conductor, insulation protection is achieved through the internal and external settings of the first conductor and the insulating sleeve, improving safety.

[0024] It should be understood that the above summary and the following detailed description of the present invention are exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of a gas-insulated switchgear with a top extension after removing the gas tank housing.

[0026] Figure 2 FIG. is a schematic cross-sectional structural diagram of a gas-insulated switchgear with a top extension, where the disconnector is in the switch closed position, and the second wiring pipe, disconnector, first isolating contact, second isolating contact, grounding contact, and insulating push rod are not sectioned.

[0027] Figure 3 FIG. is Figure 2 a partial structural diagram of the solid-sealed pole column, first isolating contact, and first wiring pipe in

[0028] Figure 4 FIG. is Figure 2 a structural diagram of the disconnector in the switch grounded position in

[0029] Figure 5 FIG. is Figure 2 a structural diagram of the disconnector in the switch open position in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0031] refer to Figures 1-5 A side-expanded inflatable cabinet switch comprises: an air box 1, a first wiring tube 2 and a second wiring tube 3 with one end sealed and extending into the air box 1, and a switch assembly 4 arranged in the air box 1, wherein the second wiring tube 3 is arranged on the side of the air box 1; the switch assembly 4 comprises:

[0032] The isolating switch 41 is driven by the driving shaft 5 to rotate, and the two ends of the isolating switch 41 are bent and arranged, and the two ends are respectively set as conductive ends 411; specifically, the isolating switch 41 is an isolating knife with two ends coplanarly arranged, the middle part of the isolating switch 41 is bent, and the angle between the two ends of the isolating switch 41 is an obtuse angle, and the driving shaft 5 is driven to rotate by an external rotation driving device;

[0033] A sealed pole 42, conductively connected to one end of the first wiring tube 2;

[0034] A first isolating contact 43 is provided on one side of the outer periphery of the isolating switch 41 , the first isolating contact 43 is conductively connected to the sealed pole 42 and the outer side cover is provided with a first insulating cover 421 ;

[0035] The second isolating contact 44 is arranged on the upper side of the outer periphery of the isolating switch 41 and connected to the inner wall of the gas box 1 through the insulating member 7. The second isolating contact 44 is conductively connected to one end of the second wiring tube 3 through the conductive wire 441. The end of the insulating member 7 is provided with a second insulating cover 71 which is arranged outside the second isolating contact 44. The first insulating cover 421 and the second insulating cover 71 are arranged to give way to the side opening of the rotation path of the isolating switch 41. Specifically, the insulating member 7 is a contact insulator.

[0036] The grounding contact 45 is arranged on the other side of the outer periphery of the isolating switch 41; the isolating switch 41 is used to rotate to the switch closed position where the two conductive ends 411 are respectively conductively connected to the first isolating contact 43 and the second isolating contact 44, or the switch grounded position where the two conductive ends 411 are respectively conductively connected to the first isolating contact 43 and the grounding contact 45, or the switch open position where the two conductive ends 411 are suspended. Specifically, the grounding contact 45 is fixed to the inner wall of the gas box 1 through a grounding angle steel, and the conductive connection described in the context of this embodiment can be a strap contact finger, a spring contact finger, an elastic fit or other methods.

[0037] The above-mentioned structure is set up, by arranging the second wiring tube on the side of the gas box as a busbar bushing, so that the side extension connection of the busbar bushings between adjacent inflatable switch cabinets can be realized through a standard busbar connector, thereby improving the convenience of operation and reducing the overall height of the inflatable cabinet switch. At the same time, the straight-type isolating switch 41 is replaced by a bent-type isolating switch 41 to reduce the vertical activity space of the isolating switch 41, reduce the vertical space inside the gas box 1 required for the installation of the switch assembly 4, and reduce the vertical height and manufacturing cost of the gas box 1; and, due to the bent setting of the isolating switch 41, the distance between the two conductive ends 411 is shortened, which in turn causes the distance between the first isolating contact 43 and the second isolating contact 44 to be shortened, which is prone to insulation hazards. Therefore, the first isolating contact 43 and the second isolating contact 44 are insulated and isolated by the first insulating cover 421 and the second insulating cover 71 respectively to reduce the risk of insulation hazards caused by shortened distance.

[0038] Specifically, the number of the drive shafts 5 is set to one, and it rotates through one side wall of the air box 1 and then rotates to connect to the brackets 6 arranged on the two opposite inner walls of the air box 1. The number of the switch assemblies 4 is set to three groups and they are arranged side by side along the length direction of the drive shaft 5. The bending parts of the isolating switches 41 of the three groups of the switch assemblies 4 are arranged side by side and spaced on the drive shaft 5. The three groups of the sealed poles 42 of the switch assemblies 4 are respectively set as A-phase poles 46, B-phase poles 47 and C-phase poles 48. The first wiring tubes 2 and the second wiring tubes 3 are each provided with three and correspond to the three groups of switch assemblies 4 respectively. The outer layer of the isolating switch 41 is wrapped with insulating material, the cross-section of the drive shaft 5 is set to a polygon, and the outer linkage sleeve of the drive shaft 5 is provided with an insulating cylinder with an inner hole cross-section adapted thereto. The three isolating switches 41 are fixedly sleeved on the outside of the insulating cylinder, thereby providing insulation protection between the drive shaft 5 and the isolating switch 41. In addition, the bracket 6 is made of an insulating elastic material so that the bracket 6 has insulating properties and a certain elasticity. Therefore, on the basis of supporting the drive shaft 5 through the bracket 6, the bracket 6 can also play a role in strengthening insulation and performing a certain amount of elastic compensation for the deformation of the air box 1.

[0039] The existing inflatable cabinet switch connects the first isolating switch 41 to the moving end of the vacuum arc extinguishing chamber 422 in the sealed pole 42 through the soft connection 426. Since the soft connection 426 is linked with the laterally movable insulating pull rod 423, a conductive connection needs to be transferred between the first isolating switch 41 and the soft connection 426 through the copper conductor in the branch bus to achieve conductive stability. This arrangement not only makes the branch bus occupy a large space, but also makes the use of copper material larger, further increasing the cost. More copper conductors are arranged in the gas box 1, which increases the risk of insulation damage.

[0040] Therefore, to solve the above problems, the encapsulated pole 42 is horizontally arranged on one side of the outer periphery of the disconnector 41. The first isolating contact 43 and the first insulating cover 421 are arranged at one end of the encapsulated pole 42 close to the disconnector 41. Inside the encapsulated pole 42, a vacuum interrupter 422 and an insulating pull rod 423 that is horizontally movable driven by an external driving device and has one end inserted into the moving end of the vacuum interrupter 422 through a moving end conductor 424 are successively arranged in a direction away from the first isolating contact 43. Specifically, the other end of the insulating pull rod 423 penetrates the side wall of the gas tank 1 in a sealed manner and is connected to the external driving device. A static end conductor 425 is arranged through the side wall of the static end of the vacuum interrupter 422, with one end electrically connected to the first isolating contact 43 and the other end corresponding to one end of the insulating pull rod 423. The moving end conductor 424 is connected to a flexible connection 426 with one end linked to the insulating pull rod 423. The other end of the flexible connection 426 is electrically connected to one end of the first wiring pipe 2. Specifically, in this embodiment, the conductors mentioned in the context can all be made of copper conductors. Thus, by directly electrically connecting the first isolating contact 43 to the static end of the vacuum interrupter 422 through the static end conductor 425, there is no need for a transfer conductor such as a busbar to conduct electricity between the first isolating contact 43 and the encapsulated pole 42, further reducing the vertical space inside the gas tank 1 required for installing the switch assembly 4, reducing the vertical height and manufacturing cost of the gas tank 1. At the same time, it also reduces the amount of copper used, reduces the connection points, reduces the loop resistance, and reduces the dangerous points of insulation breakdown inside the gas tank 1. Specifically, compared with a conventional gas-insulated switchgear, the height of the gas tank 1 can be reduced by about 50%. The gas tank 1 is a standard cuboid with a simple structure, which is convenient for manufacturing. The amount of copper conductor used is reduced by more than 20%, enhancing the insulation performance and reducing the product cost.

[0041] In order to achieve the sealing between the first wiring pipe 2 and the gas box 1 and the conductive connection between the first wiring pipe 2 and the solid-sealed pole column 42, a conductive part 427 is provided with a downward protrusion at the bottom of the solid-sealed pole column 42. A connecting conductor 428 is vertically penetrated in the conductive part 427. The other end of the flexible connection 426 is conductively screwed to the upper end of the connecting conductor 428. The first wiring pipe 2 includes a first sleeve 21, a first conductor 22 disposed in the first sleeve 21, and an insulating sleeve 23 whose upper and lower ends are respectively hermetically inserted into the conductive part 427 and the upper end of the first sleeve 21. Specifically, the insulating sleeve 23 is a silica gel sleeve. A shielding net is provided on the inner wall of the first sleeve 21. The first sleeve 21 and the first conductor 22 are integrally solid-sealed. The upper end of the first sleeve 21 is pressed against the bottom of the gas box 1 by a sleeve pressing plate 24 and is horizontally folded after extending downward at the lower end. A sealing ring 25 is provided for sealing between the upper end of the first sleeve 21 and the gas box 1. The upper end of the first conductor 22 is conductively inserted into the jack of the connecting conductor 428. The upper end of the first conductor 22, the insulating sleeve 23, and the sealing ring 25 are distributed in sequence from the inside to the outside. Thus, through the cooperation of the sleeve pressing plate 24 and the sealing ring 25, the upper end of the first sleeve 21 is hermetically connected to the gas box 1, and on the basis of realizing the conductive connection between the first wiring pipe 2 and the solid-sealed pole column 42 through the conductive insertion of the first conductor 22 and the moving-end conductor 424, insulation protection is achieved through the internal and external settings of the first conductor 22 and the insulating sleeve 23, improving safety.

[0042] In order to improve the insulation protection stability of the insulating sleeve 23 after the conductive connection between the first conductor 22 and the moving-end conductor 424, the outer layer of the insulating sleeve 23 is set as a semiconductor shielding layer. The upper and lower ends of the insulating sleeve 23 are provided with sealing parts 231 whose side wall thickness gradually decreases in opposite directions. Sealing holes adapted to the sealing parts 231 are respectively provided in the conductive part 427 and the upper end of the first sleeve 21. The middle thickness of the insulating sleeve 23 expands laterally to form an insulating part 232 that abuts between the conductive part 427 and the upper end of the first sleeve 21. Specifically, the cross-sections of the sealing holes in the upper and lower ends of the insulating sleeve 23, the conductive part 427, and the upper end of the first sleeve 21 are all set as frustum cones, so that the upper and lower ends of the insulating sleeve 23 are hermetically and fittingly connected to the corresponding sealing holes through conical surfaces. And through the setting of the insulating part 232, the contact between the conductive part 427 and the side wall of the upper end of the first sleeve 21 is isolated, improving the insulation protection stability.

[0043] Specifically, the second isolating contact 44, the grounding contact 45, and the first isolating contact 43 are respectively arranged on the upper side, the rear side, and the front side of the isolating switch 41, and the first insulating cover 421 and the second insulating cover 71 are both set as rectangular shells. The top and rear openings of the first insulating cover 421 are set, and the top, bottom and front openings of the second insulating cover 71 are set. The bottom of the first insulating cover 421 is offset downward and is set as a giving part 4211 for making way for the isolating switch 41 to rotate to the two conductive ends 411 to respectively connect the first isolating contact 43 and the grounding contact 45 conductively.

[0044] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An inflatable cabinet switch with side expansion, characterized in that, Comprising: An air box (1), a first wiring pipe (2) and a second wiring pipe (3) with one end hermetically penetrating into the air box (1), and a switch assembly (4) arranged in the air box (1). The second wiring pipe (3) is arranged on the side of the air box (1); the switch assembly (4) includes: A disconnector (41), rotatably arranged by being driven by a driving shaft (5). The disconnector (41) is bent between its two ends and the two ends are respectively set as conductive ends (411); A solid-sealed pole column (42), electrically connected to one end of the first wiring pipe (2); A first isolating contact (43), arranged on one side of the outer periphery of the disconnector (41). The first isolating contact (43) is electrically connected to the solid-sealed pole column (42) and is covered with a first insulating cover (421) on the outside; A second isolating contact (44), arranged on the upper side of the outer periphery of the disconnector (41) and connected to the inner wall of the air box (1) through an insulating member (7). The second isolating contact (44) is electrically connected to one end of the second wiring pipe (3) through a conducting wire (441). The end of the insulating member (7) is provided with a second insulating cover (71) covering the outside of the second isolating contact (44). The first insulating cover (421) and the second insulating cover (71) are arranged with openings on the side corresponding to the rotation path of the disconnector (41) to make way; A grounding contact (45), arranged on the other side of the outer periphery of the disconnector (41). The disconnector (41) is used to rotate so that the two conductive ends (411) are respectively electrically connected to the first isolating contact (43) and the second isolating contact (44), or are respectively electrically connected to the first isolating contact (43) and the grounding contact (45), or are suspended.

2. The side-expanded inflatable cabinet switch according to claim 1, characterized in that, The number of the driving shafts (5) is set to one, and it rotates through one side wall of the air box (1) and then is rotatably connected to brackets (6) arranged on two opposite inner walls of the air box (1). The number of the switch assemblies (4) is three and they are arranged side by side along the length direction of the driving shaft (5). The bent parts of the disconnectors (41) of the three switch assemblies (4) are sleeved on the driving shaft (5) side by side at intervals. The solid-sealed pole columns (42) of the three switch assemblies (4) are sequentially set as a phase pole column (46), b phase pole column (47) and c phase pole column (48). Both the first wiring pipe (2) and the second wiring pipe (3) have three and respectively correspond to the three switch assemblies (4).

3. The side-expanded inflatable cabinet switch according to claim 1, characterized in that, The encapsulated pole column (42) is horizontally arranged on one side of the outer periphery of the disconnecting switch (41). The first isolating contact (43) and the first insulating cover (421) are arranged at one end of the encapsulated pole column (42) close to the disconnecting switch (41). Inside the encapsulated pole column (42), a vacuum interrupter (422) and an insulating pull rod (423) that is driven horizontally by an external driving device and has one end inserted into the moving end of the vacuum interrupter (422) through a moving end conductor (424) are sequentially arranged in a direction away from the first isolating contact (43). A static end conductor (425) with one end conductively connected to the first isolating contact (43) and the other end corresponding to one end of the insulating pull rod (423) penetrates through the side wall of the static end of the vacuum interrupter (422). The moving end conductor (424) is connected to a flexible connection (426) with one end linked to the insulating pull rod (423). The other end of the flexible connection (426) is conductively connected to one end of the first wiring tube (2).

4. The side-expanded inflatable cabinet switch as claimed in claim 3, wherein A conductive part (427) protrudes downward from the bottom of the encapsulated pole column (42). A connecting conductor (428) vertically penetrates through the conductive part (427). The other end of the flexible connection (426) is conductively screwed to the upper end of the connecting conductor (428). The first wiring tube (2) includes a first sleeve (21), a first conductor (22) inserted into the first sleeve (21), and an insulating sleeve (23) with upper and lower ends hermetically inserted into the conductive part (427) and the upper end of the first sleeve (21) respectively. The upper end of the first sleeve (21) is pressed by a sleeve pressing plate (24) against the bottom of the gas tank (1) and extends downward and then is horizontally folded. A sealing ring (25) is arranged for sealing between the upper end of the first sleeve (21) and the gas tank (1). The upper end of the first conductor (22) is conductively inserted into the jack of the connecting conductor (428). The upper end of the first conductor (22), the insulating sleeve (23), and the sealing ring (25) are distributed in sequence from the inside to the outside.

5. The side-expanded gas-insulated switchgear switch according to claim 4, characterized in that The outer layer of the insulating sleeve (23) is a semiconductor shielding layer. The upper and lower ends of the insulating sleeve (23) are provided with sealing parts (231) with side wall thicknesses gradually decreasing in opposite directions. Sealing holes adapted to the sealing parts (231) are respectively arranged in the conductive part (427) and the upper end of the first sleeve (21). The thickness of the middle part of the insulating sleeve (23) expands horizontally outward to form an insulating part (232) that abuts between the conductive part (427) and the upper end of the first sleeve (21).

6. The side-expanded inflatable cabinet switch according to claim 2, wherein, The bracket (6) is made of an insulating elastic material.

7. The side-expanded gas-insulated switchgear switch according to claim 1, characterized in that, The second isolating contact (44), the grounding contact (45), and the first isolating contact (43) are respectively arranged on the upper side, the rear side, and the front side of the isolating switch (41); the first insulating cover (421) and the second insulating cover (71) are both arranged as rectangular parallelepiped shells; the top and rear of the first insulating cover (421) are opened, and the top, bottom, and front of the second insulating cover (71) are opened; the bottom of the first insulating cover (421) is offset downward to form a giving way (4211) for allowing the isolating switch (41) to rotate to the two conductive ends (411) to respectively connect the first isolating contact (43) and the grounding contact (45) to electrical conduction.

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