CN220291516U - Atmospheric sealing air insulation switch equipment - Google Patents

Abstract

The utility model provides an atmospheric sealed air insulated switchgear, comprising: the insulation cavities are arranged adjacently, and normal-pressure air is distributed in the insulation cavities; the single-phase electrified bodies are arranged in the insulating cavities, and the single-phase electrified bodies in two adjacent insulating cavities realize interphase insulation through the normal-pressure air; one end of the single-phase electrified body is connected with the first grounding shell in an insulating way through a first supporting piece; the other end of the single-phase electrified body is connected with the second grounding shell in an insulating way through a second supporting piece; the insulating cavity is formed between the first grounding shell and the second grounding shell, and the inter-phase creepage distance between two adjacent single-phase electrified bodies is greater than the ground creepage distance of the single-phase electrified bodies. The independent insulating cavity is adopted, so that the occurrence of interphase short circuit is thoroughly eliminated, and the safety of the product is improved; the formed single-phase insulation structure can effectively prolong the inter-phase creepage distance, thereby avoiding the inter-phase creepage.

Description

Atmospheric sealing air insulation switch equipment

Technical Field

The utility model relates to the technical field of power distribution switchgear, in particular to normal-pressure sealed air insulation switchgear.

Background

The power distribution switch device is one of important devices for controlling power distribution lines, and a circuit breaker, a disconnecting switch, a grounding switch and the like for controlling the on-off of each phase line of a power supply are integrated in the power distribution switch device, and the circuit breaker, the disconnecting switch and the grounding switch are all controlled by the circuit, so that the circuit breaker, the disconnecting switch and the grounding switch are collectively called a control switch, each phase circuit is controlled by the corresponding control switch, and any control switch can be electrified under specific conditions, so that the control switch is collectively called an electrified body in the power distribution switch device. However, in the design of power distribution switchgear, most of the current designs do not have independent insulating cavities of each phase, and each phase of electrified body is isolated and supported by adopting an insulator, so that inter-phase short circuit faults are particularly easy to occur in a severe operating environment, internal arcs are generated, the cabinet is exploded and burned, and casualties of personnel and equipment are caused.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art that the independence between each phase of control switch is poor, the interphase short circuit is easy to occur, and the safety is poor.

To this end, the utility model provides an atmospheric sealed air insulated switchgear.

The utility model provides an atmospheric sealed air insulated switchgear, comprising:

the insulation cavities are arranged adjacently, and normal-pressure air is distributed in the insulation cavities;

the single-phase electrified bodies are arranged in the insulating cavities, and the single-phase electrified bodies in two adjacent insulating cavities realize interphase insulation through the normal-pressure air;

one end of the single-phase electrified body is connected with the first grounding shell in an insulating way through a first supporting piece;

the other end of the single-phase electrified body is connected with the second grounding shell in an insulating way through a second supporting piece;

the insulating cavity is formed between the first grounding shell and the second grounding shell, and the inter-phase creepage distance between two adjacent single-phase electrified bodies is greater than the ground creepage distance of the single-phase electrified bodies.

The normal-pressure sealed air insulation switch equipment provided by the utility model has the advantages that the insulation cavities are used for accommodating the single-phase electrified bodies, the interphase insulation between the single-phase electrified bodies is ensured through normal-pressure air, the quantity of the insulation cavities is matched with that of the single-phase electrified bodies, the formed insulation cavities can be in any form, and as long as the independence of each insulation cavity is ensured, no conductive path exists between the adjacent insulation cavities; specifically, a three-phase circuit includes at least an a-phase charged body, a B-phase charged body and a C-phase charged body, and it is understood that the a-phase charged body, the B-phase charged body and the C-phase charged body are each one of single-phase charged bodies, and three insulating cavities are each used for accommodating the a-phase charged body, the B-phase charged body and the C-phase charged body, and there is no solid insulating member directly connected between adjacent single-phase charged bodies. The first grounding shell and the second grounding shell are used for providing grounding protection and also serve as supporting beams for providing mounting positions, specifically, the first grounding shell and the second grounding shell are vertically distributed, one ends of three single-phase live bodies are respectively connected with the first grounding shell in an insulating way through first supporting pieces, the other ends of the three single-phase live bodies are respectively connected with the second grounding shell in an insulating way through second supporting pieces, wherein the first supporting pieces are connected with the first grounding shell in an insulating way, the outer surfaces of the first supporting pieces are additionally provided with insulating jackets, and insulating gaskets are additionally arranged at the connecting positions of the first supporting pieces and the second grounding shell or the first supporting pieces are made of insulating materials; the second supporting piece is in insulating connection with the second grounding shell, wherein an insulating sheath is additionally arranged on the outer surface of the second supporting piece, an insulating pad is additionally arranged at the connecting position of the second supporting piece and the second grounding shell, or the second supporting piece is made of insulating materials; the insulating material used should have a certain strength to satisfy the supporting effect of the first supporting member or the second supporting member.

Because of the isolation effect of the insulating cavity, the interphase creepage path (taking A phase and B phase as examples) between two adjacent single-phase electrified bodies is A phase electrified body, a first support piece/a second support piece, a grounding shell, a first support piece/a second support piece, B phase electrified bodies, the interphase creepage distance is larger than the opposite ground creepage distance and is double the opposite ground creepage distance, single-phase creepage is already generated before interphase creepage occurs, the interphase creepage is thoroughly stopped, and single-phase insulation is realized.

According to the technical scheme, the normal-pressure sealed air-insulated switchgear can be provided with the following additional technical characteristics:

in the technical scheme, the air gap between the single-phase electrified bodies in the two adjacent insulating cavities is larger than 125mm.

In this technical scheme, sufficient air gap guarantees the interphase insulating properties between the adjacent single-phase electrified body, and it can be understood that when the requirement to insulating properties is different, can adjust the air gap, makes it be less than 125mm.

In the above technical solution, further includes:

the insulating baffle is arranged between two adjacent insulating cavities.

In this technical scheme, in insulating baffle locates the air gap between the adjacent single-phase electrified body, with single-phase electrified body no direct connection relation, further improve the insulating properties between the adjacent single-phase electrified body through insulating baffle.

In the above technical solution, further includes:

and the third supporting piece is arranged between the first grounding shell and the second grounding shell and is respectively in insulating contact with the first grounding shell and the second grounding shell.

In the technical scheme, two ends of the third supporting piece are respectively connected with the first grounding shell and the second grounding shell in an insulating way; specifically, two third support pieces are respectively arranged at two sides of the first grounding shell, three single-phase electrified bodies are arranged between interlayers of the two third support pieces, and the third support pieces are made of insulating materials, such as polytetrafluoroethylene, epoxy glass fiber plates and other insulating materials with certain strength.

In the above technical scheme, the third supporting piece, the first grounding shell, the second grounding shell and the insulating baffle are enclosed to form a closed or semi-closed space, and the insulating cavity is arranged in the closed or semi-closed space.

In this technical scheme, first ground connection casing and second ground connection casing have restricted the upper surface and the lower surface of insulating cavity respectively, and two third support pieces have restricted a side of insulating cavity respectively, and insulating cavity of different positions probably adjacent one or two insulating baffles, and a side of insulating cavity is restricted to every insulating baffle.

In the above technical solution, the single-phase charging body includes:

the circuit breaker is connected with the first grounding shell through the first supporting piece;

the three-position switch is electrically connected with the circuit breaker and is connected with the second grounding shell through the second supporting piece.

In the technical scheme, the three-station switch has the functions of the isolating switch and the grounding switch; specifically, the three-position switch is provided with a moving contact, an isolating contact and a grounding contact, the moving contact of the three-position switch is connected with a power line, the isolating contact is electrically connected with the circuit breaker, the grounding contact is connected with the ground, and specifically, the grounding contact can be arranged on any shell subjected to grounding treatment, such as a second grounding shell or a grounding box body; the movable contact of the three-position switch is connected with the isolation contact and the grounding contact in a switching way through swinging, so that two positions corresponding to the three-position switch are corresponding, the movable contact, the isolation contact and the grounding contact are simultaneously disconnected, and the movable contact is fixed on the second grounding shell through the second supporting piece and is insulated from the second grounding shell; the third supporting piece is provided with a passage for the movable contact to swing back and forth.

In the above technical solution, further includes:

the first driving piece is arranged on the first grounding shell and connected with the first supporting piece and is used for driving the first supporting piece to move in the vertical direction, so that opening and closing of the circuit breaker are achieved.

In the technical scheme, a first supporting piece is connected with a switching-on and switching-off mechanism in the circuit breaker, a first driving piece can be a driving shaft, the first driving piece is rotatably connected with a first grounding shell, the first supporting piece is in transmission connection with the first driving piece, at the moment, the first supporting piece is indirectly connected with the first grounding shell, when the first driving piece rotates, the first supporting piece synchronously performs up-and-down actions, so that switching-on and switching-off of the circuit breaker are controlled, and the circuit breaker in three single-phase live bodies can be controlled to be switched on and off by the same first driving piece.

In any of the above technical solutions, the method further includes:

the second driving piece is arranged on the second grounding shell, connected with the three-station switch and used for controlling the three-station switch to act.

In the technical scheme, the second driving piece can be a driving shaft, the second driving piece is in insulating connection with the moving contact of the three-position switch, specifically, the moving contact of the second driving piece can be connected with the second driving piece through an insulating connecting rod structure, and the moving contact of the three-position switch is driven to swing when the second driving piece rotates.

In any of the above technical solutions, the method further includes:

the first grounding shell and the second grounding shell are respectively connected with the grounding box body, and the grounding box body is connected with the ground.

In the technical scheme, all parts in the switch equipment are arranged in the grounding box body, and the first grounding shell, the second grounding shell and the grounding box body are combined to form an integrated grounding shell.

In any of the above technical solutions, the grounding box is a normal pressure sealed box.

In the technical scheme, the insulating performance is reduced after no insulating gas leaks, and further the risk of insulating accidents is caused.

In summary, due to the adoption of the technical characteristics, the utility model has the beneficial effects that:

the independent insulating cavity is adopted, so that the occurrence of interphase short circuit is thoroughly eliminated, and the safety of the product is improved; the formed single-phase insulation structure can effectively prolong the inter-phase creepage distance, ensure that the inter-phase creepage distance is larger than the ground creepage distance, and thoroughly stop the inter-phase creepage from happening before the inter-phase creepage happens, thereby realizing single-phase insulation. The insulating cavity and the insulating baffle form double insulation guarantee, and the insulating performance is further improved. The non-pressure normal pressure sealing box body is adopted, so that the insulating performance is reduced after insulating gas leaks, and further the risk of insulating accidents is caused.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an atmospheric sealed air insulated switchgear according to one embodiment of the present utility model;

fig. 2 is a schematic view of the structure of an atmospheric sealed air-insulated switchgear according to an embodiment of the present utility model;

FIG. 3 is a side view of the atmospheric sealed air insulated switchgear of FIG. 2;

fig. 4 is a schematic view of the structure of a single-phase live body in an atmospheric sealed air-insulated switchgear according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of an atmospheric sealed air insulated switchgear according to an embodiment of the present utility model;

fig. 6 is a schematic perspective view of a single-phase live body in a normal pressure sealed air-insulated switchgear according to an embodiment of the present utility model.

The correspondence between the reference numerals and the component names in fig. 1 to 6 is:

1. an insulating cavity; 2. a single-phase charged body; 3. a first grounded housing; 4. a second grounded housing; 5. an insulating baffle; 6. a first support; 7. a second support; 8. a third support; 9. a grounding box body;

11. atmospheric air;

21. a circuit breaker; 22. a three-station switch;

211. a first driving member;

221. a second driving member; 222. a moving contact; 223. isolating the contacts; 224. a ground contact.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

An atmospheric sealed air-insulated switchgear provided according to some embodiments of the present utility model is described below with reference to fig. 1 to 6.

Some embodiments of the present application provide an atmospheric sealed air insulated switchgear.

As shown in fig. 1 to 6, a first embodiment of the present utility model proposes an atmospheric sealed air-insulated switchgear including: the insulation cavities 1, at least three insulation cavities 1 are adjacently arranged, and normal pressure air 11 is distributed in the insulation cavities 1; the single-phase electrified bodies 2 are arranged in the insulating cavities 1, and the single-phase electrified bodies 2 in two adjacent insulating cavities 1 realize interphase insulation through the normal-pressure air 11; the first grounding shell 3, one end of the single-phase electrified body 2 is connected with the first grounding shell 3 in an insulating way through a first supporting piece 6; the other end of the single-phase electrified body 2 is connected with the second grounding shell 4 in an insulating way through a second supporting piece 7; the insulating cavity 1 is formed between the first grounding shell 3 and the second grounding shell 4, and the inter-phase creepage distance between two adjacent single-phase electrified bodies 2 is greater than the ground creepage distance of the single-phase electrified bodies 2.

The normal-pressure sealed air insulation switch device provided by the embodiment is characterized in that the insulation cavity 1 is used for accommodating the single-phase electrified bodies 2, the interphase insulation between the single-phase electrified bodies 2 is ensured through normal-pressure air 11, the quantity of the insulation cavity 1 is matched with that of the single-phase electrified bodies 2, the insulation cavity 1 can be formed in any form, and as long as the independence of each insulation cavity 1 is ensured, no conductive path exists between the adjacent insulation cavities 1; specifically, a three-phase circuit includes at least an a-phase charged body, a B-phase charged body and a C-phase charged body, and it is understood that the a-phase charged body, the B-phase charged body and the C-phase charged body are each one of the single-phase charged bodies 2, and the three insulating cavities 1 are respectively used for accommodating the a-phase charged body, the B-phase charged body and the C-phase charged body, and there is no solid insulating member directly connected between the adjacent single-phase charged bodies 2. The first grounding shell 3 and the second grounding shell 4 are used for providing grounding protection and also serve as supporting beams for providing mounting positions, specifically, the first grounding shell 3 and the second grounding shell 4 are vertically arranged, one ends of three single-phase charged bodies 2 are respectively connected with the first grounding shell 3 in an insulating way through first supporting pieces 6, and the other ends of the three single-phase charged bodies are respectively connected with the second grounding shell 4 in an insulating way through second supporting pieces 7, wherein the mode that the first supporting pieces 6 are connected with the first grounding shell 3 in an insulating way can be realized by additionally arranging insulating jackets on the outer surfaces of the first supporting pieces 6, adding insulating gaskets at the connecting positions of the first supporting pieces and the second grounding shell or adopting the first supporting pieces 6 made of insulating materials; the second supporting piece 7 is in insulation connection with the second grounding shell 4, wherein an insulation sheath is additionally arranged on the outer surface of the second supporting piece 7, an insulation pad is additionally arranged at the connection position of the second supporting piece 7 and the second grounding shell, or the second supporting piece 7 is made of insulation materials; the insulating material used should have a certain strength to satisfy the supporting effect of the first supporting member 6 or the second supporting member 7.

Because of the isolation effect of the insulating cavity 1, the interphase creepage path (taking the phase A and the phase B as examples) between two adjacent single-phase electrified bodies 2 is the phase A electrified body, the first supporting piece 6/the second supporting piece 7, the grounding shell, the first supporting piece 6/the second supporting piece 7, the phase B electrified body, the interphase creepage distance is larger than the opposite earth creepage distance and is double of the opposite earth creepage distance, the single-phase creepage occurs before the interphase creepage occurs, the interphase creepage is thoroughly stopped, and the single-phase insulation is realized.

A second embodiment of the present utility model proposes a normal pressure sealed air-insulated switchgear, and on the basis of the first embodiment, as shown in fig. 1 to 6, an air gap between single-phase charged bodies 2 in adjacent two insulating chambers 1 is greater than 125mm.

In this embodiment, a sufficient air gap ensures interphase insulating performance between adjacent single-phase charged bodies 2, and it is understood that the air gap may be adjusted to be less than 125mm when the requirements for insulating performance are different.

A third embodiment of the present utility model provides an atmospheric sealed air-insulated switchgear, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, further comprising:

the insulating baffle 5 is arranged between two adjacent insulating cavities 1.

In this embodiment, the insulating barrier 5 is provided in the air gap between the adjacent single-phase charged bodies 2, and has no direct connection relation with the single-phase charged bodies 2, and the insulating performance between the adjacent single-phase charged bodies 2 is further improved by the insulating barrier 5.

A fourth embodiment of the present utility model provides an atmospheric sealed air-insulated switchgear, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, further comprising:

the third supporting member 8 is disposed between the first grounding shell 3 and the second grounding shell 4, and is in insulating contact with the first grounding shell 3 and the second grounding shell 4, respectively.

In this embodiment, both ends of the third support member 8 are respectively connected with the first grounding shell 3 and the second grounding shell 4 in an insulating manner; specifically, the two third supporting members 8 are respectively disposed on two sides of the first grounding shell 3, the three single-phase electrified bodies 2 are located between the interlayers of the two third supporting members 8, and the third supporting members 8 are made of insulating materials, such as polytetrafluoroethylene, epoxy glass fiber boards and other insulating materials with certain strength.

A fifth embodiment of the present utility model provides an air-insulated switchgear sealed under normal pressure, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, the third supporting member 8, the first grounding shell 3, the second grounding shell 4, and the insulating barrier 5 enclose a closed or semi-closed space, and the insulating cavity 1 is disposed in the closed or semi-closed space.

In this embodiment, the first grounding shell 3 and the second grounding shell 4 limit the upper surface and the lower surface of the insulating cavity 1, respectively, and the two third supporting pieces 8 limit one side surface of the insulating cavity 1, respectively, and the insulating cavity 1 at different positions may be adjacent to one or two insulating barriers 5, and each insulating barrier 5 limits one side surface of the insulating cavity 1.

A sixth embodiment of the present utility model proposes a normal pressure sealed air-insulated switchgear, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, the single-phase live body 2 includes:

a circuit breaker 21, the circuit breaker 21 being connected to the first grounding shell 3 by a first support 6;

a three-position switch 22 electrically connected to the circuit breaker 21, the three-position switch 22 being connected to the second grounded housing 4 via the second support 7.

In this embodiment, the three-position switch 22 has the functions of both a disconnecting switch and a grounding switch; specifically, the three-position switch 22 has a moving contact 222, an isolating contact 223 and a grounding contact 224, the moving contact 222 of the three-position switch 22 is connected with a power line, the isolating contact 223 is electrically connected with the circuit breaker 21, the grounding contact 224 is connected with the ground, specifically, the grounding contact 224 can be arranged on any housing subjected to the grounding treatment, such as the second grounding housing 4 or the grounding box 9; the movable contact 222 of the three-position switch 22 is connected with the isolating contact 223 and the grounding contact 224 in a switching way through swinging, so that two positions of the corresponding three-position switch 22 are corresponding, the movable contact 222, the isolating contact 223 and the grounding contact 224 are simultaneously disconnected with a third position of the corresponding three-position switch 22, and the movable contact 222 is fixed on the second grounding shell 4 through the second supporting piece 7 and is insulated from the second grounding shell 4; the third support 8 should be provided with a passage for the movable contact 222 to swing back and forth.

A seventh embodiment of the present utility model provides an atmospheric sealed air-insulated switchgear, and further includes, on the basis of any of the above embodiments, as shown in fig. 1 to 6:

the first driving piece 211 is disposed on the first grounding shell 3 and connected to the first supporting piece 6, and is used for driving the first supporting piece 6 to move in the vertical direction, so as to realize opening and closing of the circuit breaker 21.

In this embodiment, the first supporting member 6 is connected to the opening and closing mechanism in the circuit breaker 21, the first driving member 211 may be a driving shaft, the first driving member 211 is rotatably connected to the first grounding shell 3, the first supporting member 6 is in transmission connection with the first driving member 211, at this time, the first supporting member 6 is indirectly connected to the first grounding shell 3, and when the first driving member 211 rotates, the first supporting member 6 synchronously performs the up-and-down motion, so as to control the opening and closing of the circuit breaker 21, and the circuit breaker 21 in the three single-phase live electrical bodies 2 may be controlled to be opened and closed by the same first driving member 211.

An eighth embodiment of the present utility model provides an atmospheric sealed air-insulated switchgear, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, further comprising:

the second driving member 221 is disposed on the second grounding shell 4, and is connected to the three-position switch 22, and is used for controlling the three-position switch 22 to operate.

In this embodiment, the second driving member 221 may be a driving shaft, the second driving member 221 is connected with the moving contact 222 of the three-position switch 22 in an insulating manner, specifically, the moving contact 222 of the second driving member 221 may be connected with the second driving member 221 through an insulating connecting rod structure, and the second driving member 221 will drive the moving contact 222 of the three-position switch 22 to swing when rotating.

A ninth embodiment of the present utility model provides an atmospheric sealed air-insulated switchgear, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, further comprising:

the grounding box body 9 is used for accommodating the switch equipment, the first grounding shell 3 and the second grounding shell 4 are respectively connected with the grounding box body 9, and the grounding box body 9 is connected with the ground.

In this embodiment, the components in the switchgear are all disposed in the grounding box 9, and the first grounding shell 3, the second grounding shell 4, and the grounding box 9 are combined to form an integrated grounding shell.

A tenth embodiment of the present utility model provides an air-insulated switchgear sealed at normal pressure, and on the basis of any of the above embodiments, as shown in fig. 1 to 6, the grounding box 9 is a sealed box at normal pressure.

In this embodiment, no leakage of the insulating gas results in a decrease in insulating performance, thereby causing a risk of an insulation accident.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An atmospheric sealed air insulated switchgear comprising:

the insulation cavities (1) are adjacently arranged, and normal-pressure air (11) is distributed in the insulation cavities (1);

the single-phase electrified bodies (2) are arranged in the insulating cavities (1), and the single-phase electrified bodies (2) in two adjacent insulating cavities (1) realize interphase insulation through the normal-pressure air (11);

one end of the single-phase electrified body (2) is connected with the first grounding shell (3) in an insulating way through a first supporting piece (6);

the other end of the single-phase electrified body (2) is connected with the second grounding shell (4) in an insulating way through a second supporting piece (7);

the insulating cavity (1) is formed between the first grounding shell (3) and the second grounding shell (4), and the inter-phase creepage distance between two adjacent single-phase electrified bodies (2) is greater than the ground creepage distance of the single-phase electrified bodies (2).

2. Atmospheric sealed air-insulated switchgear according to claim 1, characterized in that the air gap between the single-phase live bodies (2) in adjacent two insulating cavities (1) is greater than 125mm.

3. The atmospheric sealed air insulated switchgear of claim 1, further comprising:

and the insulating baffle plates (5) are arranged between two adjacent insulating cavities (1).

4. A sealed air insulated switchgear as claimed in claim 3, further comprising:

and the third supporting piece (8) is arranged between the first grounding shell (3) and the second grounding shell (4) and is respectively in insulating contact with the first grounding shell (3) and the second grounding shell (4).

5. The atmospheric sealed air-insulated switchgear according to claim 4, wherein the third supporting member (8), the first grounding shell (3), the second grounding shell (4) and the insulating barrier (5) enclose a closed or semi-closed space, and the insulating cavity (1) is disposed in the closed or semi-closed space.

6. An atmospheric sealed air-insulated switchgear according to claim 1, characterized in that the single-phase live body (2) comprises:

a circuit breaker (21), the circuit breaker (21) being connected to the first grounding shell (3) by a first support (6);

and the three-position switch (22) is electrically connected with the circuit breaker (21), and the three-position switch (22) is connected with the second grounding shell (4) through the second supporting piece (7).

7. The atmospheric sealed air-insulated switchgear of claim 6, further comprising:

the first driving piece (211) is arranged on the first grounding shell (3) and connected with the first supporting piece (6) and is used for driving the first supporting piece (6) to move in the vertical direction, so that opening and closing of the circuit breaker (21) are achieved.

8. The atmospheric sealed air-insulated switchgear of claim 6, further comprising:

the second driving piece (221) is arranged on the second grounding shell (4), is connected with the three-position switch (22) and is used for controlling the three-position switch (22) to act.

9. The atmospheric sealed air insulated switchgear of claim 1, further comprising:

the grounding box body (9) is used for accommodating the switch equipment, the first grounding shell (3) and the second grounding shell (4) are respectively connected with the grounding box body (9), and the grounding box body (9) is connected with the ground.

10. The atmospheric sealed air insulated switchgear according to claim 9, characterized in that the grounded tank (9) is an atmospheric sealed tank.