A switch cabinet

Abstract

This invention relates to a switchgear, comprising: a cabinet; an external busbar connection structure disposed on the cabinet; a busbar located within the cabinet and electrically connected to the external busbar connection structure; a three-position switch disposed within the cabinet, having a grounding position, an isolation position, and a conducting position electrically connected to the busbar; the switchgear further comprising: a busbar grounding switch, including a grounding stationary contact and a grounding moving contact disposed within the cabinet; the grounding stationary contact is electrically connected to the busbar; the grounding moving contact is used for grounding connection and is driven by a corresponding drive mechanism to reciprocate, thereby connecting and disconnecting with the grounding stationary contact. When maintenance of the switchgear is required, the switch of the three-position switch is first rotated to the grounding position to de-energize the entire switchgear, and then the grounding moving contact of the busbar grounding switch is made conductive with the grounding stationary contact. At this time, the busbar is grounded to eliminate the charge carried in the busbar, ensuring the safety of maintenance personnel.

Description

Technical Field

[0001] This invention relates to a switch cabinet. Background Technology

[0002] During maintenance of switchgear, grounding is generally achieved through a three-position switch inside the switchgear cabinet. For example, Chinese utility model patent CN208256566U discloses a three-position switch structure for electrical cabinets, including a cabinet and a three-position switch installed inside the cabinet. The three-position switch includes an isolating stationary contact, a grounding stationary contact, and a rotary switch. During its rotation stroke, the rotary switch has a grounding position connected to the grounding stationary contact, a conducting position connected to the isolating stationary contact, and an isolating position that is simultaneously disconnected from both the isolating stationary contact and the grounding stationary contact.

[0003] During switchgear maintenance, the rotary switch needs to be rotated to the grounding position to ground the entire switchgear and de-energize it. However, because residual charge may remain on the busbars, personnel still need to use handheld testing devices to check for energization before maintenance, posing a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a switchgear that solves the technical problem that in the prior art, switchgear requires workers to use handheld testing devices to check whether the busbar is energized during maintenance, which poses a safety hazard.

[0005] To achieve the above objectives, the technical solution of the switchgear of the present invention is as follows:

[0006] The switchgear includes: a cabinet; an external busbar connection structure mounted on the cabinet; a busbar located inside the cabinet and electrically connected to the external busbar connection structure; a three-position switch mounted inside the cabinet, having a grounding position, an isolation position, and a conducting position electrically connected to the busbar; the switchgear also includes: a busbar grounding switch, including a grounding stationary contact and a grounding moving contact arranged inside the cabinet; the grounding stationary contact is electrically connected to the busbar; the grounding moving contact is used for grounding connection and is driven by a corresponding driving mechanism to reciprocate to connect and disconnect with the grounding stationary contact.

[0007] The beneficial effects are as follows: When the switchgear is in normal use, the three-position switch is in the conducting position, and the three grounding moving contacts are disconnected from the corresponding grounding stationary contacts. At this time, the switchgear can work normally. When the switchgear needs to be inspected, the three-position switch is first rotated to the grounding position so that the entire switchgear is de-energized. In order to prevent any residual charge on the busbar, the grounding moving contact of the busbar grounding switch is made to conduct with the grounding stationary contacts. At this time, the busbar is grounded to eliminate the charge on the busbar and ensure the safety of maintenance personnel.

[0008] Furthermore, the external busbar connection structure is located at the top of the cabinet, the three-position switch is located at the bottom of the cabinet, and the busbar grounding switch is located between the external busbar connection structure and the three-position switch.

[0009] The beneficial effect is that it adapts to switch cabinets with external busbar connection structures located on the top of the cabinet.

[0010] Furthermore, the grounding contact reciprocates in the left-right direction, and the grounding contact is located on the right side of the cabinet. The drive mechanism and the operating mechanism of the three-position switch are both located on the right side wall of the cabinet.

[0011] Furthermore, the grounding contact is reciprocatingly mounted inside the cabinet.

[0012] The beneficial effect is that the direct reciprocating assembly of the grounding contact inside the cabinet can reduce the space occupied by the grounding contact, and the bus grounding switch can be installed inside the cabinet without changing the external dimensions of the cabinet.

[0013] Furthermore, a cylindrical grounding contact seat is fixed on the inner wall of the cabinet. The grounding contact seat is used for grounding connection. The grounding movable contact is conductively and slidably assembled in the grounding contact seat. The output end of the drive mechanism is driven by a screw. The grounding movable contact is helically assembled on the screw so that the grounding movable contact moves along the axial direction of the screw when the screw is driven by the drive mechanism.

[0014] Furthermore, the bus grounding switch is a three-phase bus grounding switch, and the three grounding moving contacts of the three-phase bus grounding switch share a common driving mechanism.

[0015] The beneficial effects are: the three-phase busbar grounding switch is suitable for most switch cabinets with three-phase busbars, and the three grounding moving contacts share a single drive mechanism, which can reduce costs and the size of the switch cabinet.

[0016] Furthermore, each grounding contact is connected to a transmission component, and each transmission component is equipped with a sprocket. Any two adjacent transmission components can be linked together by a chain and a sprocket. One of the transmission components is connected to the output shaft of the drive mechanism.

[0017] Furthermore, an insulator is fixedly installed on the inner wall of the cabinet, and the grounding stationary contact is fixedly connected to the insulator.

[0018] The beneficial effect is that the grounding stationary contact is fixed to the inner wall of the cabinet by insulators, which can ensure the stability of the grounding stationary contact and the grounding moving contact when they are plugged in.

[0019] Furthermore, the busbar is sandwiched between the insulator and the grounding stationary contact.

[0020] The benefits are: it can effectively utilize the space inside the cabinet and ensure the stability of the busbar.

[0021] Furthermore, the switch cabinet is a gas-insulated switchgear. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the switch cabinet of the present invention (the drive mechanism is not shown).

[0023] Figure 2 for Figure 1 A schematic diagram of the busbar grounding switch in the circuit;

[0024] Figure 3 for Figure 2 A schematic diagram of the structure with three screws linked together;

[0025] In the diagram: 1-Cabinet; 2-Chain; 3-Grounding busbar; 4-Plate; 5-Grounding contact seat; 6-Operating mechanism; 7-Three-position switch; 8-Grounding stationary contact; 9-Isolation stationary contact; 10-Busbar; 11-Insulator; 12-Grounding stationary contact seat; 13-Sprocket; 14-Drive mechanism; 15-Transmission component; 16-Grounding moving contact; 17-Strap contact finger; 18-Screw; 19-Guide protrusion; 20-Side wall; 21-Busbar external connection structure. Detailed Implementation

[0026] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] Specific embodiments of the switch cabinet of the present invention:

[0028] like Figure 1 As shown, the switch cabinet includes a cabinet 1, inside which is a three-position switch 7. The three-position switch 7 is driven by an operating mechanism 6. The three-position switch 7 has a grounding position connected to a grounding stationary contact 8, a conducting position connected to an isolating stationary contact 9, and an isolating position that is simultaneously disconnected from both the isolating stationary contact and the grounding stationary contact. In this embodiment, the isolating stationary contact 9 is fixed to the side wall 20 of the cabinet 1 by an insulator. The isolating stationary contact 9 is electrically and fixedly connected to one end of the busbar 10, and the other end of the busbar 10 is electrically connected to the external busbar structure 21. Specifically, the external busbar structure 21 is a busbar bushing.

[0029] In this embodiment, the external busbar connection structure 21 is fixed to the top of the cabinet 1, the three-position switch 7 is located at the bottom of the cabinet 1, and a busbar grounding switch is provided between the external busbar connection structure 21 and the three-position switch 7. In other embodiments, the external busbar connection structure can be a busbar connector with authorization announcement number CN208256566U, and the busbar is arranged horizontally. In this case, the busbar grounding switch can be located above the busbar.

[0030] Specifically, the busbar grounding switch includes a grounding stationary contact base 12 and a grounding moving contact 16, such as... Figure 2 As shown, an insulator 11 is fixedly mounted on the side wall 20, and a grounding stationary contact 12 is fixedly assembled to the insulator 11 by fastening bolts to ensure the stability of the grounding stationary contact 12 when it is plugged into the grounding moving contact 16. The busbar 10 is sandwiched between the grounding stationary contact 12 and the insulator 11, and the busbar 10 is electrically connected to the grounding stationary contact 12. In other embodiments, if the busbar itself has sufficient stability, the grounding stationary contact can be directly fixed to the busbar. Alternatively, the insulator can be fixed to the side wall, the grounding stationary contact can be fixed to the insulator, and the grounding stationary contact and the busbar can be flexibly connected.

[0031] like Figure 2 As shown, a grounding contact seat 5 is fixedly mounted on the side wall 20. A grounding movable contact 16 is slidably mounted inside the grounding contact seat 5. The grounding movable contact 16 is screwed onto a screw 18 and driven by the screw 18 to reciprocate. Specifically, a watchband contact finger 17 is provided on the inner wall of the grounding contact seat 5. The grounding movable contact 16 is electrically connected through the watchband contact finger during its sliding motion in the grounding contact seat 5. Of course, the watchband contact finger can also be replaced with a spring contact finger. It should be noted that the grounding movable contact 16 is directly reciprocated within the grounding contact seat 5, that is, the bus grounding switch in this embodiment is a direct-acting structure. In other embodiments, the bus grounding switch can be set as a swing structure, such as the structure of a three-position switch. In this case, the bus grounding switch occupies a large space, requiring a change in the overall cabinet size.

[0032] In this embodiment, in order to ensure that the grounding movable contact 16 can move axially when the screw 18 rotates, a guide protrusion 19 is provided on the inner wall of the grounding contact seat 5. The guide protrusion 19 can be the guide key between the stationary contact seat and the conductive body in the authorization announcement number CN105185642B.

[0033] In this embodiment, the grounding contact seat 5 is fixed to the side wall 20 by a pad 4. The pad 4 is a metal conductive plate. A grounding busbar 3 is provided between the pad 4 and the side wall 20. The grounding busbar 3 is electrically connected to the grounding contact seat 5 through the pad 4.

[0034] In this embodiment, a transmission component 15 is fixedly mounted on the side wall 20. The transmission component 15 includes a housing sealed and fixed to the side wall 20 and a transmission rod sealed and rotatably assembled within the housing. One end of the transmission rod is fixedly connected to the screw 18 via an expansion pin, and the other end is provided with a sprocket 13. Figure 3As shown, adjacent sprockets 13 are connected by a chain 2 to achieve linkage. One of the three drive rods is connected to the drive mechanism 14 to achieve linkage of the three drive rods, so that the three screws 18 operate synchronously. In other embodiments, the sprockets can be replaced with gears, and the three drive rods are linked by gear meshing. Alternatively, each drive rod can be driven by a drive mechanism, which not only increases cost but also increases the size of the cabinet. The transmission component can be a magnetohydrodynamic seal, as is available in the prior art.

[0035] In this embodiment, the operating mechanism 6 of both the drive mechanism 14 and the three-position switch 7 is located on the right side wall of the cabinet 1.

[0036] The switchgear in this embodiment is a gas-filled switchgear containing insulating gas. In other embodiments, the bus grounding switch can be used in other switchgear.

[0037] In normal use, the three-position switch 7 is driven by the operating mechanism 6 to rotate the switch to the conducting position, and the three grounding moving contacts 16 are disconnected from the corresponding grounding stationary contacts 12 by the driving mechanism 14. At this time, the switch cabinet can work normally. When the switch cabinet needs to be repaired, the switch of the three-position switch 7 is first rotated to the grounding position by the operating mechanism 6, so that the entire switch cabinet is de-energized. In order to prevent residual charge on the busbar 10, the grounding moving contacts 16 are driven by the driving mechanism 14 to extend out of the grounding contact seat 5, so that the grounding moving contacts 16 are connected to the grounding stationary contacts 12. At this time, the busbar 10 is grounded to eliminate the charge on the busbar 10 and ensure the safety of maintenance personnel.

Claims

1. Switchgear, including: Cabinet; The external busbar connection structure is installed on the cabinet. The busbar is located inside the cabinet and one end is electrically connected to the external structure of the busbar. A three-position switch is installed inside the cabinet and has a grounding position connected to a grounding stationary contact, a conducting position connected to an isolating stationary contact, and an isolating position that is simultaneously disconnected from the grounding stationary contact and the isolating stationary contact. The isolating stationary contact is electrically and fixedly connected to the other end of the busbar. The switchgear is characterized by further comprising: The busbar grounding switch includes a stationary grounding contact and a moving grounding contact arranged inside the cabinet. The grounding stationary contact is electrically connected to the busbar; The moving grounding contact is used for grounding connection and is driven by a corresponding driving mechanism to reciprocate, so as to connect and disconnect with the stationary grounding contact.

2. The switchgear according to claim 1, characterized in that, The external busbar connection structure is located at the top of the cabinet, the three-position switch is located at the bottom of the cabinet, and the busbar grounding switch is located between the external busbar connection structure and the three-position switch.

3. The switch cabinet according to claim 2, characterized in that, The grounding contact reciprocates in the left-right direction. The grounding contact is located on the right side of the cabinet. The drive mechanism and the operating mechanism of the three-position switch are both located on the right side wall of the cabinet.

4. The switchgear according to any one of claims 1-3, characterized in that, The grounding contact is reciprocatingly mounted inside the cabinet.

5. The switchgear according to claim 4, characterized in that, A cylindrical grounding contact seat is fixed on the inner wall of the cabinet. The grounding contact seat is used for grounding connection. The grounding movable contact is conductively and slidably assembled in the grounding contact seat. The output end of the drive mechanism is driven by a screw. The grounding movable contact is helically assembled on the screw so that the grounding movable contact moves along the axial direction of the screw when the screw is driven by the drive mechanism.

6. The switchgear according to any one of claims 1-3, characterized in that, The bus grounding switch is a three-phase bus grounding switch, and the three grounding moving contacts of the three-phase bus grounding switch share a common driving mechanism.

7. The switch cabinet according to claim 6, characterized in that, Each grounding contact is connected to a transmission component, and each transmission component is equipped with a sprocket. Any two adjacent transmission components can be linked together by the chain and the sprocket. One of the transmission components is connected to the output shaft of the drive mechanism.

8. The switchgear according to any one of claims 1-3, characterized in that, An insulator is fixedly installed on the inner wall of the cabinet, and the grounding stationary contact is fixedly connected to the insulator.

9. The switchgear according to claim 8, characterized in that, The busbar is sandwiched between the insulator and the grounding stationary contact.

10. The switchgear according to any one of claims 1-3, characterized in that, The switchgear is a gas-filled switchgear.

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