Gas insulation cabinet

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a gas insulation cabinet. The gas insulation cabinet comprises a gas box, a circuit breaker, a first isolation switch and a second isolation switch, the circuit breaker is arranged in the gas box, and the first isolation switch and the second isolation switch are arranged on the two sides of the circuit breaker respectively. The first disconnecting switch comprises a first connection contact, a first grounding contact and a first moving contact, the first connection contact is electrically connected with the circuit breaker, and the first moving contact can move between the first connection contact and the first grounding contact so as to be electrically connected with the first connection contact and the first grounding contact alternately. The second isolating switch comprises a second connecting contact, a second grounding contact and a second moving contact, the second connecting contact is electrically connected with the circuit breaker, and the second moving contact can be electrically connected with the second connecting contact and the second grounding contact alternately. The gas insulation cabinet can be grounded on the two sides of the circuit breaker.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a gas insulation cabinet. Background Art

[0002] Wind energy is a clean and pollution-free renewable energy source. In recent years, wind power generation has achieved rapid development. Offshore wind power is an important area of ​​renewable energy development. Offshore wind power has advantages over onshore wind power such as long power generation time and no land space occupation. Offshore wind power is an important force to promote the advancement of wind power technology and industrial upgrading, and is an important measure to promote energy structure adjustment.

[0003] Box-type gas-insulated switchgear (CGIS for short) is a commonly used equipment in the offshore wind power field. At present, the voltage of common box-type gas-insulated switchgear products in China is 12kV~40.5kV, and the vacuum circuit breaker is mainly equipped with a three-position disconnector. The three-position disconnector can be located at the upper or lower end of the circuit breaker. Regardless of whether the three-position disconnector is at the upper or lower end of the circuit breaker, it can only achieve grounding on the outgoing line / line side, and cannot achieve direct grounding on the incoming line / bus side.

[0004] Therefore, it is urgent to improve the gas insulated cabinet to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a gas insulation cabinet, which can realize grounding on both sides of the circuit breaker.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Gas insulated cabinet, including:

[0008] Gas box;

[0009] A circuit breaker is arranged in the gas box, and a first isolating switch and a second isolating switch are respectively arranged on both sides of the circuit breaker;

[0010] The first disconnector comprises a first connection contact, a first grounding contact and a first moving contact, the first connection contact is electrically connected to the circuit breaker, and the first moving contact is movable between the first connection contact and the first grounding contact to be alternately electrically connected to the first connection contact and the first grounding contact;

[0011] The second disconnector includes a second make contact, a second grounding contact and a second moving contact, wherein the second make contact is electrically connected to the circuit breaker, and the second moving contact is movable between the second grounding contact and the second make contact to be alternately electrically connected to the second make contact and the second grounding contact.

[0012] As an optional solution, the gas box is provided with an incoming line terminal and an outgoing line terminal, the circuit breaker includes a pole, the first connecting contact is electrically connected to the moving end of the pole, and the first moving contact is electrically connected to the incoming line terminal; the second connecting contact is electrically connected to the static end of the pole, and the second moving contact is electrically connected to the outgoing line terminal.

[0013] As an optional solution, the first isolating switch further includes a first isolating contact, the first isolating contact is connected to the inner wall of the gas box through a first insulator, the first isolating contact is electrically connected to the incoming line terminal, the first moving contact is slidably arranged in the first isolating contact, one end of the first moving contact contacts the first grounding contact when sliding out of the first isolating contact, and the other end of the first moving contact contacts the first connection contact when sliding out of the first isolating contact; and / or,

[0014] The second isolating switch also includes a second isolating contact, which is connected to the inner wall of the gas box through a second insulator, and the second isolating contact is electrically connected to the outlet terminal. The second moving contact is slidably arranged in the second isolating contact, and one end of the second moving contact contacts the second grounding contact when sliding out of the second isolating contact, and the other end of the second moving contact contacts the second connection contact when sliding out of the second isolating contact.

[0015] As an optional solution, the first isolating switch further includes a first driving assembly, wherein the first driving assembly is configured to drive the first moving contact to move between the first make contact and the first grounding contact; and / or,

[0016] The second disconnect switch further includes a second drive assembly configured to drive the second moving contact to move between the second make contact and the second ground contact.

[0017] As an optional solution, the first driving assembly includes a first driving member and a first transmission screw, the first driving member is drivingly connected to the first transmission screw and can drive the first transmission screw to rotate, the first moving contact is threadedly connected to the first transmission screw, and the rotation of the first transmission screw can drive the first moving contact to reciprocate; and / or,

[0018] The second drive assembly includes a second drive member and a second transmission screw. The second drive member is drivingly connected to the second transmission screw and can drive the second transmission screw to rotate. The second moving contact is threadedly connected to the second transmission screw. The rotation of the second transmission screw can drive the second moving contact to reciprocate.

[0019] As an optional solution, at least one of the first connecting contact, the first grounding contact, the first moving contact, the first isolating contact, the second connecting contact, the second grounding contact, the second moving contact and the second isolating contact is provided with a pressure equalizing ring, and the pressure equalizing ring is sleeved on the end of the corresponding contact to increase the tube wall thickness of the contact.

[0020] As an optional solution, the edge of the end surface of the pressure equalizing ring is provided with a rounded corner.

[0021] As an optional solution, the first isolating switch further includes a first connecting conductor, and the first connecting conductor is used to electrically connect the first isolating contact and the incoming line terminal; and / or,

[0022] The second isolating switch further includes a second connecting conductor, and the second connecting conductor is used to electrically connect the second isolating contact and the outlet terminal.

[0023] As an optional solution, the circuit breaker also includes an operating mechanism, which is arranged outside the gas box and is driven and connected to the pole. A sealing plate is provided at the connection between the operating mechanism and the gas box, and a sealing ring is sandwiched between the sealing plate and the gas box to ensure a sealed connection between the gas box and the operating mechanism.

[0024] As an optional solution, an epoxy resin layer is provided on the surface of the pole.

[0025] As an option, the outer surface of the air box is provided with an anti-corrosion coating.

[0026] Beneficial effects:

[0027] The gas-insulated cabinet proposed in the utility model is provided with a first isolating switch on one side of the circuit breaker. When the first moving contact slides toward the first connection contact, the first moving contact, the first connection contact and the circuit breaker are in the connection state. When the first moving contact slides in the opposite direction toward the first grounding contact, it is separated from the circuit breaker, and the first moving contact is connected with the first grounding contact, so that the line on one side of the circuit breaker is in the grounding state. Similarly, by providing a second isolating switch on the other side of the circuit breaker, when the second moving contact slides toward the second connection contact, the second moving contact, the second connection contact and the circuit breaker are in the connection state. When the second moving contact slides in the opposite direction toward the second grounding contact, it is separated from the circuit breaker, and the second moving contact is connected with the second grounding contact, so that the other side of the circuit breaker is in the grounding state. Therefore, by providing the first isolating switch and the second isolating switch, direct grounding of both sides of the circuit breaker can be achieved without the need to operate by secondary closing of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the internal structure of a gas-insulated cabinet provided in Embodiment 1 of the present utility model;

[0029] Figure 2 It is a partial cross-sectional schematic diagram of a gas-insulated cabinet provided in Embodiment 1 of the present utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the pressure equalizing ring provided in the first embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the internal structure of the gas insulation cabinet provided in the second embodiment of the present utility model.

[0032] In the figure:

[0033] 11. front plate; 111. inlet terminal; 1101. inlet bushing; 112. outlet terminal; 1102. outlet bushing; 12. rear plate; 13. top plate; 14. bottom plate;

[0034] 2. Circuit breaker; 21. Pole; 211. Moving end; 212. Static end; 22. Operating mechanism; 23. Sealing plate;

[0035] 3. First disconnector; 31. First make-up contact; 32. First grounding contact; 33. First moving contact; 34. First isolating contact; 35. First drive assembly; 351. First drive member; 352. First transmission screw; 36. Grading ring; 361. Rounded corners; 37. First connecting conductor; 38. First insulator;

[0036] 4. Second isolating switch; 41. Second make-up contact; 42. Second grounding contact; 43. Second moving contact; 44. Second isolating contact; 45. Second drive assembly; 451. Second drive member; 452. Second transmission screw; 46. Second connecting conductor; 47. Second insulator; 48. Third insulator; 49. Third connecting conductor. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Embodiment 1:

[0042] like Figure 1 As shown, this embodiment provides a gas-insulated cabinet suitable for 72.5 kV offshore wind power. The gas-insulated cabinet includes a gas box, which includes a front plate 11, a rear plate 12, a top plate 13, a bottom plate 14, a left plate and a right plate. The rear plate 12 of the gas box is provided with an inlet terminal 111 and an outlet terminal 112. The inlet terminal 111 includes an inlet bushing 1101, which is provided at the upper end of the rear plate 12, and the power inlet line passes through the inlet bushing 1101 to connect to the gas box; the outlet terminal 112 includes an outlet bushing 1102, which is provided at the lower end of the rear plate 12, and the power outlet line passes through the outlet bushing 1102 to connect to the gas box.

[0043] The gas box is made of 316 stainless steel plate. In order to adapt to the application scenario of offshore platforms, the outer surface of the gas box is provided with an anti-corrosion coating to solve the problem of seawater corrosion. Specifically, the anti-corrosion coating can be achieved by processes such as anodizing or brushing anti-corrosion coating.

[0044] Furthermore, if Figure 1 As shown, the gas insulated cabinet also includes a circuit breaker 2, which is arranged in the gas box. The circuit breaker 2 includes a pole 21 and an operating mechanism 22, the pole 21 is arranged inside the gas box, and the surface of the pole 21 is provided with an epoxy resin layer. The operating mechanism 22 is arranged outside the gas box, specifically on the front plate 11. The operating mechanism 22 is connected to the pole 21 by driving, and the pole 21 is driven to open and close by the operating mechanism 22. A sealing plate 23 is provided at the connection between the operating mechanism 22 and the gas box, and a sealing ring is sandwiched between the sealing plate 23 and the gas box so that the operating mechanism 22 is sealed and connected to the gas box. The circuit breaker 2 can adopt the conventional structure in the prior art, and the specific structure and working principle of the pole 21 and the operating mechanism 22 will not be described in detail here.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, the gas-insulated cabinet also includes a first disconnector 3 and a second disconnector 4. The first disconnector 3 adopts a three-position disconnector and is horizontally arranged in the gas box. The first disconnector 3 includes a first connection contact 31, a first grounding contact 32 and a first moving contact 33. The first connection contact 31 is electrically connected to the circuit breaker 2, and the first moving contact 33 can move between the first connection contact 31 and the first grounding contact 32 to be alternately electrically connected to the first connection contact 31 and the first grounding contact 32. The second disconnector 4 also adopts a three-position disconnector and is horizontally arranged in the gas box. The second disconnector 4 includes a second connection contact 41, a second grounding contact 42 and a second moving contact 43. The second connection contact 41 is electrically connected to the circuit breaker 2, and the second moving contact 43 can move between the second grounding contact 42 and the second connection contact 41 to be alternately electrically connected to the second connection contact 41 and the second grounding contact 42. The first grounding contact 32 is disposed on the rear plate 12 , and the second grounding contact 42 is disposed on the front plate 11 .

[0046] By providing a first isolating switch 3 on one side of the circuit breaker 2, when the first moving contact 33 slides toward the first connection contact 31, the first moving contact 33, the first connection contact 31 and the circuit breaker 2 are in a connection state, and when the first moving contact 33 slides in the opposite direction toward the first grounding contact 32, it is separated from the circuit breaker 2, and the first moving contact 33 is connected with the first grounding contact 32, so that the line on one side of the circuit breaker 2 is in a grounding state. Similarly, by providing a second isolating switch 4 on the other side of the circuit breaker 2, when the second moving contact 43 slides toward the second connection contact 41, the second moving contact 43, the second connection contact 41 and the circuit breaker 2 are in a connection state, and when the second moving contact 43 slides in the opposite direction toward the second grounding contact 42, it is separated from the circuit breaker 2, and the second moving contact 43 is connected with the second grounding contact 42, so that the line on the other side of the circuit breaker 2 is in a grounding state. Therefore, by providing the first isolating switch 3 and the second isolating switch 4, direct grounding of both sides of the circuit breaker 2 can be achieved without the need to operate by secondary closing of the circuit breaker 2, thereby facilitating equipment safety and maintenance.

[0047] Specifically, in this embodiment, the first connection contact 31 is electrically connected to the moving end 211 of the pole 21, and the first moving contact 33 is electrically connected to the incoming line end 111; the second connection contact 41 is electrically connected to the static end 212 of the pole 21, and the second moving contact 43 is electrically connected to the outgoing line end 112. Of course, in other embodiments, the first connection contact 31 can also be electrically connected to the static end 212 of the pole 21, and the first moving contact 33 is electrically connected to the outgoing line end 112; the second connection contact 41 is electrically connected to the moving end 211 of the pole 21, and the second moving contact 43 is electrically connected to the incoming line end 111.

[0048] Optionally, see Figure 1 The first isolating switch 3 further includes a first isolating contact 34, which is connected to the inner wall of the gas box through a first insulator 38. The first isolating contact 34 is electrically connected to the incoming line terminal 111. The first moving contact 33 is slidably arranged in the first isolating contact 34. When one end of the first moving contact 33 slides out of the first isolating contact 34, it contacts the first grounding contact 32. When the other end of the first moving contact 33 slides out of the first isolating contact 34, it contacts the first connection contact 31. The first isolating contact 34 is arranged to fix and connect the first moving contact 33. When the incoming line terminal 111 is connected to the first isolating contact 34, the connection with the first moving contact 33 is realized, which solves the problem of inconvenience in connecting with the incoming power line due to the reciprocating movement of the first moving contact 33.

[0049] Likewise, if Figure 1As shown, the second isolating switch 4 further includes a second isolating contact 44, which is connected to the inner wall of the gas box through a second insulator 47, and is electrically connected to the outlet terminal 112. A second moving contact 43 is slidably arranged in the second isolating contact 44, and one end of the second moving contact 43 contacts the second grounding contact 42 when sliding out of the second isolating contact 44, and the other end of the second moving contact 43 contacts the second connection contact 41 when sliding out of the second isolating contact 44. The second isolating contact 44 is arranged to fix and connect the second moving contact 43, and when the outlet terminal 112 is connected to the second isolating contact 44, the connection with the second moving contact 43 is realized, thereby solving the problem of inconvenience in connecting with the power outlet due to the reciprocating movement of the second moving contact 43.

[0050] like Figure 1 and Figure 2 As shown, in order to drive the first moving contact 33 to move back and forth, the first isolating switch 3 further includes a first driving assembly 35, and the first driving assembly 35 is configured to drive the first moving contact 33 to move between the first connection contact 31 and the first grounding contact 32. In this embodiment, the first driving assembly 35 adopts the structural form of a screw module. Specifically, the first driving assembly 35 includes a first driving member 351 and a first transmission screw 352. The first driving member 351 is drivingly connected to the first transmission screw 352, and can drive the first transmission screw 352 to rotate. The first moving contact 33 is threadedly connected to the first transmission screw 352, and the rotation of the first transmission screw 352 can drive the first moving contact 33 to move back and forth. The first driving member 351 can specifically adopt a motor, and the first transmission screw 352 is driven to rotate by the rotation of the motor. In other embodiments, the first driving assembly 35 can also adopt a cylinder or an electric cylinder, etc., to directly drive the first moving contact 33 to move linearly.

[0051] Similarly, the second isolating switch 4 further includes a second drive assembly 45, which is configured to drive the second moving contact 43 to move between the second connection contact 41 and the second grounding contact 42. Specifically, the second drive assembly 45 includes a second drive member 451 and a second transmission screw 452, the second drive member 451 is drivingly connected to the second transmission screw 452, and can drive the second transmission screw 452 to rotate, the second moving contact 43 is threadedly connected to the second transmission screw 452, and the rotation of the second transmission screw 452 can drive the second moving contact 43 to reciprocate. The setting idea of ​​the second drive member 451 assembly is the same as that of the first drive assembly 35, and will not be repeated in detail here.

[0052] When the first moving contact 33 is separated from the first grounding contact 32 or the first connection contact 31, it needs to be separated until there is a clear break to ensure insulation. The wall thickness of the first isolation contact 34, the first moving contact 33, the first grounding contact 32 and the first connection contact 31 is relatively small, and the electric field is relatively concentrated, which requires that the break distance is large enough to meet the insulation requirements. Similarly, the second isolating switch 4 has the same insulation requirements when it is working. For this reason, if Figure 1 As shown, a voltage-equalizing ring 36 is provided on at least one of the first connection contact 31, the first grounding contact 32, the first moving contact 33, the first isolating contact 34, the second connection contact 41, the second grounding contact 42, the second moving contact 43 and the second isolating contact 44. The voltage-equalizing ring 36 is sleeved on the end of the corresponding contact to increase the tube wall thickness of the contact, thereby reducing the electric field concentration at the end of each contact, and further reducing the fracture distance, that is, reducing the design spacing between the contacts, which is beneficial to the design size of the gas-insulated cabinet and meets the miniaturization requirements of the product.

[0053] To further improve the electric field concentration, Figure 3 As shown, the end surface edge of the voltage-equalizing ring 36 is provided with a rounded corner 361 to reduce the edge of the end of the voltage-equalizing ring 36, thereby significantly improving the insulation strength of the product.

[0054] Alternatively, if Figure 1 As shown, in order to connect the incoming terminal 111 and the first isolating contact 34, the first isolating switch 3 further includes a first connecting conductor 37, and the first connecting conductor 37 is used to electrically connect the first isolating contact 34 and the incoming terminal 111. The first connecting conductor 37 is arranged on a first insulator 38, and the first insulator 38 plays an insulating, fastening and supporting role for the first connecting conductor 37 and the first isolating contact 34.

[0055] In order to connect the outlet terminal 112 and the second isolating contact 44, the second isolating switch 4 further includes a second connecting conductor 46, which is used to electrically connect the second isolating contact 44 and the outlet terminal 112. The second connecting conductor 46 is disposed on a second insulator 47, which insulates, fastens and supports the second connecting conductor 46 and the second isolating contact 44.

[0056] like Figure 1 and Figure 2 As shown, the static end 212 is located at the left end face of the pole 21, and the second connection contact 41 is located at the lower side of the pole 21, which is not convenient to be directly connected to the static end 212. For this reason, the second disconnector 4 further includes a third connection conductor 49, which connects the second connection contact 41 and the static end 212.

[0057] The third connection conductor 49 can be a wire, which can be bent and wired, making the connection more flexible and convenient.

[0058] In order to fix the second connection contact 41 , the second disconnector 4 further includes a third insulator 48 . The third insulator 48 is disposed on the rear plate 12 to support and fix the second connection contact 41 .

[0059] Embodiment 2:

[0060] like Figure 4 As shown, this embodiment provides a gas insulated cabinet, which is basically the same as the first embodiment, except that:

[0061] The first isolating switch 3 is arranged vertically, and the first grounding contact 32, the first isolating contact 34, the first moving contact 33 and the first connection contact 31 are arranged on a vertical line. The first grounding contact 32 is arranged on the inner wall of the top plate 13, and the first isolating contact 34 is directly connected and fixed to the incoming bushing 1101, so that the first insulator 38 can be omitted, and the structure is more concise.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Gas insulated cabinet, characterized in that: include: Gas box; A circuit breaker (2) is arranged in the gas box, and a first isolating switch (3) and a second isolating switch (4) are respectively arranged on both sides of the circuit breaker (2); The first disconnector (3) comprises a first connection contact (31), a first grounding contact (32) and a first moving contact (33), wherein the first connection contact (31) is electrically connected to the circuit breaker (2), and the first moving contact (33) is movable between the first connection contact (31) and the first grounding contact (32) to be alternately electrically connected to the first connection contact (31) and the first grounding contact (32); The second isolating switch (4) comprises a second make contact (41), a second grounding contact (42) and a second moving contact (43), wherein the second make contact (41) is electrically connected to the circuit breaker (2), and the second moving contact (43) is movable between the second grounding contact (42) and the second make contact (41) to be alternately electrically connected to the second make contact (41) and the second grounding contact (42).

2. The gas insulated cabinet according to claim 1, characterized in that: The gas box is provided with an inlet terminal (111) and an outlet terminal (112); the circuit breaker (2) comprises a pole (21); the first connection contact (31) is electrically connected to a moving end (211) of the pole (21); the first moving contact (33) is electrically connected to the inlet terminal (111); the second connection contact (41) is electrically connected to a stationary end (212) of the pole (21); the second moving contact (43) is electrically connected to the outlet terminal (112).

3. The gas insulated cabinet according to claim 2, characterized in that: The first isolating switch (3) further comprises a first isolating contact (34), the first isolating contact (34) being connected to the inner wall of the gas box via a first insulator (38), the first isolating contact (34) being electrically connected to the incoming line terminal (111), the first moving contact (33) being slidably arranged in the first isolating contact (34), one end of the first moving contact (33) being in contact with the first grounding contact (32) when sliding out of the first isolating contact (34), and the other end of the first moving contact (33) being in contact with the first connection contact (31) when sliding out of the first isolating contact (34); and / or, The second isolating switch (4) further comprises a second isolating contact (44), the second isolating contact (44) being connected to the inner wall of the gas box via a second insulator (47), the second isolating contact (44) being electrically connected to the outlet terminal (112), the second moving contact (43) being slidably arranged in the second isolating contact (44), one end of the second moving contact (43) being in contact with the second grounding contact (42) when sliding out of the second isolating contact (44), and the other end of the second moving contact (43) being in contact with the second connection contact (41) when sliding out of the second isolating contact (44).

4. The gas insulated cabinet according to claim 2, characterized in that: The first disconnector (3) further comprises a first drive assembly (35), wherein the first drive assembly (35) is configured to drive the first moving contact (33) to move between the first make contact (31) and the first ground contact (32); and / or, The second isolating switch (4) further comprises a second driving assembly (45), wherein the second driving assembly (45) is configured to drive the second moving contact (43) to move between the second make contact (41) and the second ground contact (42).

5. The gas insulated cabinet according to claim 4, characterized in that: The first driving assembly (35) comprises a first driving member (351) and a first transmission screw (352); the first driving member (351) is drivingly connected to the first transmission screw (352) and can drive the first transmission screw (352) to rotate; the first moving contact (33) is threadedly connected to the first transmission screw (352); the rotation of the first transmission screw (352) can drive the first moving contact (33) to reciprocate; and / or, The second driving assembly (45) comprises a second driving member (451) and a second transmission screw (452); the second driving member (451) is drivingly connected to the second transmission screw (452) and can drive the second transmission screw (452) to rotate; the second moving contact (43) is threadedly connected to the second transmission screw (452); the rotation of the second transmission screw (452) can drive the second moving contact (43) to reciprocate.

6. The gas insulated cabinet according to claim 3, characterized in that: At least one of the first connection contact (31), the first grounding contact (32), the first moving contact (33), the first isolating contact (34), the second connection contact (41), the second grounding contact (42), the second moving contact (43) and the second isolating contact (44) is provided with a voltage equalizing ring (36), and the voltage equalizing ring (36) is sleeved on the end of the corresponding contact to increase the tube wall thickness of the contact.

7. The gas insulated cabinet according to claim 6, characterized in that: The end surface edge of the pressure equalizing ring (36) is provided with a rounded corner (361).

8. The gas insulated cabinet according to claim 3, characterized in that: The first isolating switch (3) further comprises a first connecting conductor (37), wherein the first connecting conductor (37) is used to electrically connect the first isolating contact (34) and the incoming line terminal (111); and / or, The second isolating switch (4) further comprises a second connecting conductor (46), wherein the second connecting conductor (46) is used to electrically connect the second isolating contact (44) and the outlet terminal (112).

9. The gas insulated cabinet according to any one of claims 2 to 8, characterized in that: The circuit breaker (2) further comprises an operating mechanism (22), the operating mechanism (22) being arranged outside the gas box and being drivingly connected to the pole (21), a sealing plate (23) being arranged at the connection between the operating mechanism (22) and the gas box, a sealing ring being sandwiched between the sealing plate (23) and the gas box so that the gas box and the operating mechanism (22) are sealedly connected.

10. The gas insulated cabinet according to any one of claims 2 to 8, characterized in that: An epoxy resin layer is provided on the surface of the pole (21).

11. The gas insulated cabinet according to any one of claims 1 to 8, characterized in that: The outer surface of the air box is provided with an anti-corrosion coating.

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