CN214707025U

CN214707025U - Bushing for a switchgear cabinet and switchgear cabinet

Info

Publication number: CN214707025U
Application number: CN202120840004.6U
Authority: CN
Inventors: 仇学东
Original assignee: ABB Schweiz AG
Current assignee: ABB Schweiz AG
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-11-12
Anticipated expiration: 2031-04-22

Abstract

The present disclosure provides a bushing for a switchgear and a switchgear. The bushing comprises a cylindrical insulator adapted to be arranged on at least one of an outer wall of the switchgear cabinet and a breaking compartment wall adapted to separate the breaker compartment from the other compartments; and an inner mounting flange disposed in the cylindrical insulator and including a through hole configured with an inner diameter larger than an outer diameter of the bus bar for the bus bar to pass through the outer wall via the cylindrical insulator to connect with equipment outside the switchgear cabinet, wherein the inner mounting flange is adapted to be fixedly connected with a bus bar flange on a branch bus bar of the bus bar for fixedly coupling the branch bus bar passing through the breaking compartment wall with a stationary contact accommodated in the cylindrical insulator. The sleeve can be used as a conventional sleeve arranged on the outer wall and at the same time as a contact box arranged on the wall of the disconnection compartment, so that the high costs associated with designing and manufacturing the contact box and the sleeve respectively are significantly reduced.

Description

Bushing for a switchgear cabinet and switchgear cabinet

Technical Field

The present disclosure relates to the technical field of switchgear, and more particularly, to a bushing for a switchgear and a switchgear.

Background

The switch cabinet is an electrical device, and is used for opening and closing, controlling and protecting the electrical device in the process of generating, transmitting, distributing and converting electric energy of an electric power system. Switchgear cabinets generally have a plurality of high voltage compartments surrounded by an outer wall and a low voltage compartment such as a control compartment. The high voltage compartment generally includes a circuit breaker compartment for housing circuit breakers, a bus bar compartment, and a cable compartment. The breaker compartment is separated from the other two high voltage compartments by a breaker compartment wall. An upper contact box and a lower contact box are arranged on the wall of the breaking partition wall so that the fixed contact is arranged in the contact boxes, and branch buses in the buses are electrically coupled to the fixed contact.

The busbars in the busbar compartment are generally connected to external equipment, such as other switchgear cabinets or the like, by bushings arranged on the outer wall. The bushings arranged on the outer wall and the contact boxes arranged on the walls of the disconnection compartment are generally of completely different construction, since the penetration of the busbars and the action are not identical. Furthermore, the earthing switch in the switchgear cabinet is typically arranged in the cable compartment and is arranged in the cable compartment close to the rear wall of the outer walls.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present disclosure provide a bushing for a switchgear and the switchgear.

In one aspect of the present disclosure, a bushing for a switchgear is provided. The bushing comprises a cylindrical insulator adapted to be arranged on at least one of an outer wall of the switchgear cabinet and a breaking compartment wall adapted to separate a breaker compartment containing a circuit breaker of a plurality of compartments enclosed by the outer wall from other compartments; and an inner mounting flange disposed in the cylindrical insulator and including a through hole configured with an inner diameter larger than an outer diameter of the bus bar for the bus bar to pass through the outer wall via the cylindrical insulator to connect with equipment outside the switchgear cabinet, wherein the inner mounting flange is adapted to be fixedly connected with a bus bar flange on a branch bus bar of the bus bar for fixedly coupling the branch bus bar passing through the breaking compartment wall with a stationary contact accommodated in the cylindrical insulator.

A ferrule according to embodiments of the present disclosure can be used as a conventional ferrule arranged on an exterior wall while also being able to be used as a contact box arranged on a wall of a circuit breaking compartment. That is, the shell and the contact box are implemented using the same component. This can significantly reduce the higher costs associated with designing and manufacturing the contact box and the ferrule separately. In addition, the bushing according to the embodiment of the present disclosure can greatly reduce the number of accessories for the switchgear, thereby reducing the strength and cost of a series of operations such as assembly, maintenance, and the like.

In some embodiments, the bushing further comprises an outer mounting flange disposed outside the cylindrical insulator and adapted to be fixedly coupled to at least one of the plurality of outer walls and at least one of the circuit breaker compartment walls to secure the bushing. The external mounting flange allows simpler placement of the bushings on the outer wall and the walls of the shutdown compartment and thereby reduces installation and maintenance strength.

In some embodiments, the bushing further comprises a high voltage shielding sleeve coaxially disposed within the cylindrical insulator and fixedly coupled to the inner mounting flange. The high voltage shielding sleeve can improve the insulating property of the bushing and make the electric field distribution in and around the bushing more uniform.

In some embodiments, the inner mounting flange and the stationary contact are disposed in a high-pressure shielding sleeve.

In some embodiments, the inner mounting flange and the high pressure shield sleeve are integrally formed. This enables the sleeve to be manufactured more easily and to possess more reliable strength.

In some embodiments, the bushing further comprises a ground shield sleeve coaxially disposed in the cylindrical insulator and radially spaced apart from the high voltage shield sleeve by a predetermined distance to surround the high voltage shield sleeve. This arrangement enables a further homogenization of the electric field in and around the bushing.

In some embodiments, the cylindrical insulator is integrally formed by casting, and the high voltage shielding sleeve, the outer mounting flange, and the ground shielding sleeve are separately cast in the cylindrical insulator. In this way, the sleeve can be manufactured more easily and for higher strength.

In some embodiments, the cylindrical insulator is formed with a corrugated structure at its outer circumference to increase creepage distance.

According to a second aspect of the present disclosure, a switchgear is provided. The switchgear cabinet comprises a plurality of outer walls arranged to enclose a plurality of compartments of the switchgear cabinet; a circuit breaker compartment wall arranged to separate at least a circuit breaker compartment of the plurality of compartments for housing a circuit breaker from other compartments; and a plurality of bushings according to the above first aspect, arranged on at least one of the plurality of outer walls for the bus bars to pass through for connection with equipment outside the switchgear cabinet, and arranged on the circuit breaking compartment wall for fixedly coupling the branch bus bars of the bus bars with the stationary contacts.

In some embodiments, the switchgear further comprises an earthing switch arranged in a cable compartment of the plurality of compartments and arranged in a central position in a direction from the breaking compartment wall to the rear wall of the outer walls.

Further features of the present disclosure will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

It should be understood that this summary is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other objects, features and advantages of the embodiments of the present disclosure will become more readily understood through the following detailed description with reference to the accompanying drawings. Various embodiments of the present disclosure will be described by way of example and not limitation in the accompanying drawings, in which:

fig. 1 shows a side cross-sectional view of a switchgear, according to an exemplary embodiment of the present disclosure;

FIGS. 2 and 3 illustrate side views of a ferrule used as a contact box according to an exemplary embodiment of the present disclosure; and

figure 4 illustrates a perspective view of a ferrule used as a contact box according to an exemplary embodiment of the present disclosure.

Detailed Description

The principles of the present disclosure will now be described with reference to various exemplary embodiments shown in the drawings. It should be understood that these examples are described merely to enable those skilled in the art to better understand and further implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. It should be noted that where feasible, similar or identical reference numerals may be used in the figures and that similar or identical reference numerals may indicate similar or identical functions. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

As used herein, the term "include" and its various variants are to be understood as open-ended terms, which mean "including, but not limited to. The term "based on" may be understood as "based at least in part on". The term "one embodiment" may be understood as "at least one embodiment". The term "another embodiment" may be understood as "at least one other embodiment".

The switch cabinet is used for opening and closing, controlling and protecting electrical equipment in the process of generating, transmitting, distributing and converting electric energy of an electric power system. Fig. 1 shows a side cross-sectional view of a switchgear cabinet 200 according to an exemplary embodiment of the present disclosure. As schematically shown in fig. 1, the switchgear panel 200 comprises a plurality of high voltage compartments, for example a circuit breaker compartment 203 for accommodating a circuit breaker 204 and two other high voltage compartments, namely a bus compartment and a cable compartment 210, which are separated from the circuit breaker compartment 203 by a circuit breaker compartment wall 202.

The bus bar 205 can be electrically connected from the bus bar compartment to external devices, such as other switchgear 200, typically via bushings arranged on the outer wall 201. The branch busbar 206 of the busbar 205 is electrically coupled with a stationary contact 208 arranged in a contact box arranged on the disconnection compartment wall 202.

As mentioned in the foregoing, in a switchgear cabinet, the bushings arranged on the outer wall 201 and the contact boxes arranged on the walls of the breaking compartment generally adopt completely different configurations. This results in numerous spacers for the switchgear. The bushings and contact boxes generally need to be designed and manufactured separately, which results in an increase in the cost of the switchgear.

To address or at least partially address the above or other potential problems of the conventional switchgear cabinet 200, embodiments of the present disclosure provide a bushing 100 for a switchgear cabinet 200. The bushing 100 can be arranged not only on the outer wall 201 for the bus bar 205 to pass through to provide a bus bar connection between the switchgear cabinet 200 and other switchgear cabinets, but also on the breaking compartment wall 202 to serve as a contact box for the branch bus bar 206 and the stationary contact 208 to be fixedly coupled therein. By employing bushings 100 according to embodiments of the present disclosure, there is no longer a need to separately design the bushings 100 and the contact box, but rather to employ bushings 100 of the same construction, thereby enabling a significant reduction in the cost of the switchgear 200.

The technical solutions of the present disclosure in which the bushings 100 are arranged on the outer wall 201 and the breaker compartment wall 202 to serve as conventional bushings and contact boxes, respectively, will be described below with reference to the accompanying drawings. It should be understood that in some embodiments, such as where there is only a single switchgear cabinet 200 without requiring that the switchgear cabinet 200 be electrically connected to external equipment, such as other switchgear cabinets 200, bushings 100 according to embodiments of the present disclosure may also be disposed only in the disconnect compartment walls 202 to serve as contact boxes.

Fig. 2 and 3 illustrate side views of a ferrule 100 used as a contact box according to an exemplary embodiment of the present disclosure, and fig. 4 illustrates an isometric view of a ferrule 100 used as a contact box according to an exemplary embodiment of the present disclosure. As shown in fig. 1 to 4, a bushing 100 for a switchgear 200 according to an embodiment of the present disclosure includes a cylindrical insulator 101 and an inner mounting flange 102 disposed in the cylindrical insulator 101. In some embodiments, the inner mounting flange 102 may be coaxially disposed within the cylindrical insulator 101.

The tubular insulator 101 can be arranged on the outer wall 201 of the switchgear cabinet 200 and the breaking compartment wall 202 in a suitable manner. For example, in some embodiments, the bushing 100 may include an outer mounting flange 103 disposed outside of the cylindrical insulator 101. The outer mounting flange 103 can be fixedly connected to the outer wall 201 and the breaker compartment wall 202 by bolts or the like, thereby securing the bushing 100 to the outer wall 201 and the breaker compartment wall 202. In some embodiments, the outer mounting flange 103 may be coaxially disposed outside the tubular insulator 101.

Of course, it should be understood that the above-described embodiments in which the bushing 100 is mounted to the outer wall 201 and the disconnect compartment wall 202 via the outer mounting flange 103 are merely illustrative and are not intended to limit the scope of the present disclosure. Any other suitable structure and arrangement is possible as long as the sleeve 100 can be securely arranged on the outer wall 201 or the shut-off compartment wall 202. For example, in some embodiments, the sleeve 100 may also be disposed on the outer wall 201 or the disconnect compartment wall 202 by snapping or the like.

The inner mounting flange 102 of the bushing 100 according to embodiments of the present disclosure includes a through hole. The size (e.g., inner diameter) of the through hole is set larger than the outer diameter of the bus bar 205, so that the bus bar 205 can be connected to an external device such as another switchgear or the like through the outer wall 201 via the cylindrical insulator 101.

Furthermore, the inner mounting flange 102 can also be fixedly connected with a busbar flange 207 of a branch busbar 206 of the busbar 205, so that the branch busbar 206 passing through the breaking compartment wall 202 can be fixedly coupled with a stationary contact 208 in the cylindrical insulator 101. In this manner, by rocking in and out of the circuit breaker 204, the movable contacts of the circuit breaker 204 can move into and out of the bushing 100 to couple and decouple with the stationary contacts 208 therein. In some embodiments, for example, in the case that the bus bar 205 and the branch bus bar 206 are tubular bus bars 205, the branch bus bar 206 may be integrally formed with the fixed contact 208.

It can be seen that the sleeve 100 according to embodiments of the present disclosure can be used as a conventional sleeve disposed on the outer wall 201 while also being able to be used as a contact box disposed on the circuit breaker compartment wall 202. That is, the shell 100 and the contact box are implemented using the same component. This can significantly reduce the higher costs associated with designing and manufacturing the contact box and the ferrule 100 separately. In addition, the bushing 100 according to the embodiment of the present disclosure can greatly reduce the number of accessories for the switch cabinet 200, thereby reducing the strength and cost of a series of operations such as assembly, maintenance, and the like.

In some embodiments, the bushing 100 may further include a high voltage shielding sleeve 104 coaxially disposed within the cylindrical insulator 101. The high voltage shielding sleeve 104 is made of a metallic material, such as aluminum, for making the electric field in the bushing 100 and around the bushing 100 more uniform. The high voltage shield sleeve 104 may be fixedly coupled to the inner mounting flange 102. In some embodiments, as shown in fig. 2-4, the inner mounting flange 102 may be disposed in the high voltage shield sleeve 104 and may be integrally formed with the high voltage shield sleeve 104. In some embodiments, the stationary contact 208 may also be disposed in the high voltage shielding sleeve 104.

In addition to this, in order to further even the electric field in the bushing 100 and around the bushing 100, in some embodiments the bushing 100 may further comprise a ground shielding sleeve 105. The ground shield sleeve 105 is also coaxially arranged in the cylindrical insulator 101, and is spaced apart from the high-voltage shield sleeve 104 by a predetermined distance in the radial direction to surround the high-voltage shield sleeve 104. The length of the ground shield sleeve 105 in the axial direction may be smaller than the length of the high voltage shield sleeve 104 in the axial direction. The ground shield sleeve 105 may be electrically connected to the outer mounting flange 103.

In some embodiments, the cylindrical insulator 101 may be formed by casting epoxy. Also, the outer mounting flange 103, the ground shield sleeve 105, and the high voltage shield sleeve 104 may be cast in the cylindrical insulator 101. In this way, the bushing 100 can be manufactured in a simple manner, while having a more reinforced structure. In some embodiments, a corrugated structure may be disposed on the outer circumference of the cylindrical insulator 101, as shown in fig. 2 to 4, to increase a creepage distance to further improve the insulating performance of the bushing 100.

There is also provided a switchgear 200 according to another aspect of the present disclosure. The switchgear panel 200 comprises the above-mentioned outer walls 201, the breaking compartment walls 202 and the bushings 100 according to the above description. A plurality of bushings 100 are respectively arranged on the outer wall 201 for the passage of a busbar 205 to connect with external equipment of the switchgear cabinet 200 and on the breaking compartment wall 202 for the passage of a branch busbar 206 to fixedly couple with a stationary contact 208 in the cylindrical insulator 101. In some embodiments, the bus bar 205 and the branch bus bar 206 may be tubular bus bars to further improve the performance of the switchgear 200. In this case, the branch bus bar 206 and the stationary contact 208 may be integrally formed.

In some embodiments, as shown in fig. 1, the grounding switch 209 in a switchgear cabinet 200 according to embodiments of the present disclosure is disposed closer to the circuit breaker compartment 203 than the position of the grounding switch in a conventional switchgear cabinet. That is, the grounding switch 209 is arranged at a substantially central position in the cable compartment 210 in the direction from the breaking compartment wall 202 to the rear wall. The rear wall thereof refers to the wall of the outer wall parallel to the breaker compartment wall 202 and remote from the breaker compartment 203. Placing the grounding switch 209 in this position can avoid crossover between the main loop and the low-voltage side connection cables, further improving the insulation performance of the switchgear 200. Furthermore, this arrangement makes it possible to shorten the distance between the operating mechanism arranged outside the breaking chamber compartment and the earthing switch 209, thereby shortening and simplifying the connection mechanism therebetween, and thus improving the reliability of the control.

In the specification and the claims which follow, unless the context requires otherwise, the terms "comprise" and "comprise" are to be construed as embracing the stated elements or groups of elements but not excluding any other elements or groups of elements. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that such prior art forms part of the common general knowledge. It should be understood that the following claims are only provisional claims and are examples of possible claims and are not intended to limit the scope of the claims to any future patent application based on the present application. Elements may be added or deleted in the exemplary claims at a later date to further define or redefine the disclosure.

Claims

1. A bushing for a switchgear cabinet, comprising:

a tubular insulator (101) adapted to be arranged on at least one of an outer wall (201) and a breaking compartment wall (202) of the switchgear cabinet (200), the breaking compartment wall (202) being adapted to separate a breaker compartment (203) for accommodating a breaker (204) from other compartments of a plurality of compartments enclosed by the outer wall (201); and

an inner mounting flange (102) arranged in the cylindrical insulator (101) and comprising a through hole configured with an inner diameter larger than an outer diameter of a bus bar (205) for the bus bar (205) to be connected with equipment outside the switchgear cabinet (200) through the outer wall (201) via the cylindrical insulator (101),

wherein the inner mounting flange (102) is adapted to be fixedly connected with a busbar flange (207) on a branch busbar (206) of the busbars (205) for fixedly coupling the branch busbar (206) passing through the breaking compartment wall (202) with a stationary contact (208) accommodated in the cylindrical insulator (101).

2. The cannula according to claim 1, further comprising:

an outer mounting flange (103) arranged outside the cylindrical insulator (101) and adapted to be fixedly connected with at least one outer wall (201) of the plurality of outer walls (201) and at least one of the breaking compartment walls (202) for fixing the bushing.

3. The cannula according to claim 2, further comprising:

a high voltage shielding sleeve (104) coaxially arranged in the cylindrical insulator (101) and fixedly connected with the inner mounting flange (102).

4. The bushing of claim 3, wherein the inner mounting flange (102) and the stationary contact (208) are arranged in the high voltage shielding sleeve (104).

5. The bushing of claim 4 wherein the inner mounting flange (102) and the high voltage shield sleeve (104) are integrally formed.

6. The cannula according to claim 3, further comprising:

a ground shield sleeve (105) coaxially arranged in the cylindrical insulator (101) and radially spaced apart from the high voltage shield sleeve (104) by a predetermined distance to surround the high voltage shield sleeve (104).

7. A bushing according to claim 6, characterized in that the cylindrical insulator (101) is integrally formed by casting, and the high voltage shielding sleeve (104), the outer mounting flange (103) and the ground shielding sleeve (105) are cast in the cylindrical insulator (101), respectively.

8. A bushing according to claim 1, characterized in that the outer circumference of the cylindrical insulator (101) is formed with a corrugated structure to increase the creepage distance.

9. A switchgear, comprising:

a plurality of external walls (201) arranged to enclose a plurality of compartments of the switchgear cabinet (200);

a circuit breaker compartment wall (202) arranged to separate at least a circuit breaker compartment (203) of the plurality of compartments for housing a circuit breaker (204) from other compartments; and

a plurality of bushings (100) according to any of claims 1-8, arranged on at least one outer wall (201) of the plurality of outer walls (201) for a bus bar (205) to pass through for connection with equipment outside the switchgear cabinet (200), and arranged on the breaking compartment wall (202) for fixedly coupling a branch bus bar (206) of the bus bar (205) with a stationary contact (208).

10. The switchgear cabinet of claim 9, further comprising:

an earthing switch (209) arranged in a cable compartment (210) of the plurality of compartments and arranged in a central position in a direction from the breaking compartment wall (202) to a rear wall of the outer wall (201).