CN108807068B

CN108807068B - Solid insulating cylinder

Info

Publication number: CN108807068B
Application number: CN201710281514.2A
Authority: CN
Inventors: 王长勤; 吴超; 游浩然
Original assignee: Eaton Electrical Equipment Co Ltd
Current assignee: Eaton Electrical Equipment Co Ltd
Priority date: 2017-04-26
Filing date: 2017-04-26
Publication date: 2022-11-04
Anticipated expiration: 2037-04-26
Also published as: CN108807068A

Abstract

The invention relates to a solid insulating cylinder which comprises an insulating cover, a switch static contact and a switch support which are fixedly sealed in the insulating cover, wherein the solid insulating cylinder also comprises a first shielding net arranged at the switch static contact and a second shielding net arranged at the switch support, and a grounding coating is sprayed on the outer side of the solid insulating cylinder. The insulating cover can ensure the insulating effect and is not influenced by external conditions no matter the switch is in a working state or an isolating state; when the insulation is damaged, the short-circuit fault only occurs between opposite grounds, so that the arc energy of internal arcing is reduced, and the fault risk is reduced.

Description

Solid insulating cylinder

Technical Field

The invention relates to the field of power equipment switch cabinets, in particular to a solid insulating cylinder for a ring main unit.

Background

The solid insulation cylinder is a core insulation component of the solid insulation ring main unit. At present, the surface of the solid insulating cylinder is mostly not coated or partially coated with a shielding layer, the insulation tolerance of the solid insulating cylinder is jointly born by air and insulating materials, the insulating performance is easily influenced by external conditions, and the surface of the solid insulating cylinder is not accessible. The solid insulating cylinder coated with a shielding layer can effectively solve the above problems, and is becoming more and more popular in the market.

Chinese patent publication No. CN204360995U discloses a solid insulation cylinder. The conducting layer coats the outside of the cylinder, the cylindrical shielding net is arranged on the inner side of the cylinder, and when the disconnecting link is at the working position, the shielding net plays a role in optimizing an electric field, but does not have an isolation fracture. And the shielding net shape of the insulating cylinder is complex, and the cost is high.

Therefore, there is a need for a solid insulating cylinder with a shielding layer coated on the surface, which can maintain good insulating performance of the switch in both working state and isolation state and has a simple process.

Disclosure of Invention

In view of the above problems of the solid insulating cylinder in the prior art, the present invention provides a solid insulating cylinder, which includes an insulating cover, and a switch static contact and a switch support both fixedly sealed in the insulating cover, and is characterized in that the solid insulating cylinder further includes: the first shielding net is arranged at the switch static contact, and the second shielding net is arranged at the switch support.

Preferably, a gap is arranged between the second shielding net and the first shielding net.

Preferably, a switch is mounted on the switch support, and the switch comprises a working state and an isolation state.

Preferably, when the switch is in the isolated state, the second shielding mesh may completely cover the switch.

Preferably, the first shielding net completely covers the switch fixed contact, and when the switch is in the working state, the first shielding net partially covers the switch, and the second shielding net partially covers the switch.

Preferably, the first shielding net is a U-shaped shielding net.

Preferably, the second shielding net is a rectangular shielding net.

Preferably, the solid insulating cylinder further comprises a vacuum arc extinguish chamber and a third shielding net arranged at the movable end of the vacuum arc extinguish chamber.

Preferably, a gap is formed between the second shielding net and the third shielding net.

Preferably, one end of the third shielding net covers a ceramic-metal junction of the vacuum arc-extinguishing chamber; and the other end of the third shielding net covers the maximum stroke position of the movable end conductor connecting piece of the vacuum arc extinguish chamber.

Preferably, a gap is formed between the third shielding net and the vacuum arc extinguish chamber;

preferably, the third shielding net is a ring-shaped shielding net.

Preferably, the grounding coating is sprayed on the outer side of the insulating cover.

Preferably, the inside of the insulating cover is divided into at least two cavities which can communicate with each other.

According to another aspect of the invention, a switch cabinet is provided, which comprises a cabinet body and the solid insulation cylinder.

According to the solid insulating cylinder provided by the invention, the grounding shielding layer is sprayed on the outer surface of the insulating cover, so that good insulating property can be kept in any environment, and the solid insulating cylinder is not influenced by external conditions; the shielding net is arranged at the movable end of the vacuum arc extinguish chamber in the insulating cover, so that the electric field is effectively balanced, and the partial discharge characteristic is improved; the insulation cover is internally provided with a switch working position shielding net and an isolation position shielding net respectively, so that the insulation cover can ensure the insulation effect no matter the switch is in a working state or an isolation state, when the insulation is damaged, short-circuit faults only occur relatively to the ground, the electric arc energy of internal arcing is reduced, and the fault risk is reduced; the shielding net adopts a three-net split structure, the manufacturing process is simple, and the cost is reduced while the insulation effect is ensured.

Drawings

Fig. 1 is a front sectional view of a solid insulation cylinder according to a preferred embodiment of the invention.

Fig. 2 isbase:Sub>A schematic sectional viewbase:Sub>A-base:Sub>A of the solid insulation cartridge shown in fig. 1.

Fig. 3 is a schematic right view of the solid insulation cartridge shown in fig. 1.

Fig. 4 is a front sectional view of the vacuum interrupter of the solid insulation canister shown in fig. 1.

Fig. 5a is a schematic partial right view of the first shielding mesh of the solid insulation cylinder shown in fig. 1.

Fig. 5b is a schematic partial right view of the second shielding mesh of the solid insulation cartridge of fig. 1

Fig. 6 is a sectional front view of the solid insulation cartridge of fig. 1 in an open and closed state.

Description of reference numerals:

1. a branch bus; 10. an insulating cover; 101. a vacuum arc extinguish chamber cavity; 102. a switch chamber; 11. a gap; 12. a gap; 13. a gap; 14. a switch; 141. a switch isolation position; 142. a switch operating position; 15. a sealing groove; 2. a vacuum arc-extinguishing chamber; 21. a moving end; 23. a ceramic-metal junction; 3. a connecting row; 4. a switch static contact; 5. a third shielding mesh; 6. a second shielding mesh; 7. a first shielding mesh; 8. a switch support; 9. inner cone connector

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by specific embodiments with reference to the accompanying drawings.

Fig. 1 is a front sectional view of a solid insulation cylinder according to a preferred embodiment of the present invention, as shown in fig. 1, the solid insulation cylinder comprising: the outer side is coated with a grounding layer, and the inner part is divided into an insulating cover 10 of a vacuum arc extinguishing chamber cavity 101 and a switch cavity 102 which can be communicated; the vacuum arc extinguish chamber 2 and the branch bus 1 are fixedly sealed in the vacuum arc extinguish chamber cavity 101; and the switch support 8 is arranged on the bottom surface of the inner cavity of the switch cavity 102. The switch static contact 4 is arranged in the switch cavity 102, and the connecting bar 3 is connected with the switch static contact, and the other end of the connecting bar 3 is connected with the vacuum arc-extinguishing chamber 2. The bottom of the insulating cover 10 body is provided with an inner cone connector 9 for connecting with a cable cone.

Fig. 2 isbase:Sub>A schematic sectional viewbase:Sub>A-base:Sub>A of the solid insulation cylinder shown in fig. 1, and as shown in fig. 2, the solid insulation cylinder is provided with an inner cone connector 9 except the bottom, and is provided with an opening on the right side, and other walls are closed.

Fig. 3 is a schematic right view of the solid insulation cylinder shown in fig. 1. As shown in fig. 3, a sealing groove 15 is formed in the opening end face of the solid insulating cylinder, and after a sealing ring is installed, the sealing effect of the solid insulating cylinder when the solid insulating cylinder is connected with the cabinet body can be guaranteed, and the requirement of IP67 is met.

Further, as shown in fig. 1, the solid insulation tube further includes: the third shielding net 5 is arranged at the movable end of the vacuum arc extinguish chamber 2 in the vacuum arc extinguish chamber cavity 101; the first shielding net 7 is arranged at the switch static contact position 4 in the switch cavity 102; and a second shielding mesh 6 disposed at the switch support 8 within the switch chamber 102. Wherein, the first shielding net 7, the second shielding net 6 and the third shielding net 5 are all integrally cast in the insulating cover 10.

Fig. 4 is a sectional front view of the vacuum interrupter of the solid insulation canister shown in fig. 1, and as shown in fig. 1 and 4, one side of the third shielding mesh 5 is in electrical contact with the branch bus bar 1, and one end thereof is covered to the ceramic-metal cross point 23; the other end covers the conductor connection (not shown in fig. 4) maximum travel position of the moving end 21. A gap 11 is arranged between the third shielding net 5 and the vacuum arc-extinguishing chamber 2, so that the electric field can be improved.

Fig. 5a is a schematic partial right view of the first shielding mesh of the solid insulation cylinder shown in fig. 1, and as shown in fig. 1 and 5a, the end of the first shielding mesh 7 is in electrical contact with the connection bar 3 and completely covers the stationary switch contact 4.

Fig. 5b is a schematic partial right view of the second shielding mesh of the solid insulation cartridge of fig. 1, as shown in fig. 1 and 5b, the bottom of the second shielding mesh 6 being in electrical contact with the switch knife holder 8 and completely covering the switch 14 (see fig. 6 in detail).

Fig. 6 is a schematic view of the solid insulation canister shown in fig. 1 in a switched operating and isolated state. As shown in fig. 6, a gap 12 is provided between the upper end of the second shielding mesh 6 and the third shielding mesh 5; a gap 13 is arranged between the left end of the second shielding net 6 and the right end of the first shielding net 7.

As shown in fig. 6, when the switch 14 is located at the working position 142, the first shielding net 7 covers a portion of the switch 142 close to the switch static contact 4, the second shielding net 6 covers a portion of the switch 142 close to the switch support 8, and the third shielding net 5, the first shielding net 7, and the second shielding net 6 are all in a high potential state, so that high voltage shielding of the switch 14 at the working position 142 is realized, and insulation performance of the switch 14 at the working position 142 is ensured.

On the other hand, as shown in fig. 6, when the switch 14 is in the isolation position 141, the second shielding mesh 6 completely covers the switch 141. If the upper loop of the switch isolation position is electrified, the third shielding net 5 and the first shielding net 7 are in a high potential state, and the second shielding net 6 is in an uncharged state; if the lower loop of the switch isolation position is electrified, the third shielding net 5 and the first shielding net 7 are in an uncharged state, and the second shielding net 6 is in a high potential state, so that high-voltage shielding of the switch 14 at the isolation position 141 is realized. In both cases the insulating properties of the switch 14 in the isolating position 141 are ensured.

In other embodiments of the present invention, the first shielding net 7 is a U-shaped shielding net, or two sets of L-shaped shielding nets are symmetrically arranged.

In other embodiments of the present invention, the second shielding net 6 is a rectangular shielding net, or an elliptical shielding net.

In other embodiments of the present invention, the third shielding net 5 is a ring-shaped shielding net, or a cylindrical shielding net.

In other embodiments of the present invention, the shielding mesh is not only suitable for switches having only a working position and an isolation position, such as a two-position switch, but also suitable for multi-position switches having a working position and an isolation position, such as a three-position switch having a working position, an isolation position and a grounding position, and is particularly suitable for rotary knife switches.

In other embodiments of the present invention, the first shielding mesh 7, the second shielding mesh 6 and the third shielding mesh 5 may be processed using a semi-conductive or conductive material; the electrical contacting of the shielding mesh with the other insert can be carried out by bolting, welding or riveting.

In other embodiments of the present invention, the outer surface of the insulating cover 10 is coated with a conductive coating of metal or graphite so that the insulating properties are not susceptible to external conditions.

Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.

Claims

1. The utility model provides a solid insulating cylinder, includes the insulating boot and seals admittedly in switch static contact and switch support in the insulating boot, its characterized in that, solid insulating cylinder still includes: the first shielding net is arranged between the insulating cover and the switch static contact, and the second shielding net is arranged between the insulating cover and the switch support;

the first shielding net is electrically connected with the switch static contact, the second shielding net is electrically connected with the switch support, and the first shielding net is electrically isolated from the second shielding net.

2. The solid insulation cylinder of claim 1, wherein a gap is provided between the second shielding mesh and the first shielding mesh.

3. The solid insulation cartridge of claim 2 wherein said switch mount has a switch mounted thereon, said switch comprising an operating state and an isolated state.

4. The solid insulation cartridge of claim 3 wherein the second shielding mesh may completely cover the switch when the switch is in the isolated state.

5. The solid insulation cylinder of claim 3, wherein the first shielding mesh completely covers the switch stationary contact, and when the switch is in the operating state, the first shielding mesh partially covers the switch, and the second shielding mesh partially covers the switch.

6. The solid insulation cylinder of any of claims 1 to 5, wherein the first shielding mesh is a U-shaped shielding mesh.

7. The solid insulation cartridge of any of claims 1 to 6 wherein the second shielding mesh is a rectangular shielding mesh.

8. The solid insulation cylinder according to any one of claims 1 to 7, further comprising a vacuum interrupter and a third shielding mesh disposed at a moving end of the vacuum interrupter.

9. The solid insulation cartridge of claim 8 wherein a gap is provided between the second and third shielding meshes.

10. The solid insulation cylinder of claim 9 wherein one end of the third shielding mesh covers a ceramic-metal interface of the vacuum interrupter; the other end of the third shielding net covers the maximum stroke position of the movable end conductor connecting piece of the vacuum arc-extinguishing chamber.

11. The solid insulation cartridge of claim 10 wherein a gap is provided between the third shielding mesh and the vacuum interrupter.

12. The solid insulation cartridge of claim 11 wherein said third shielding mesh is an annular shielding mesh.

13. The solid insulation cartridge of any of claims 1 to 12 wherein a ground coating is sprayed on the outside of the insulation shield.

14. The solid insulation cylinder of claim 13, wherein the inside of the insulation cover is partitioned into two cavities that can communicate with each other.

15. A switchgear cabinet comprising a cabinet body and a solid insulation cartridge according to any of claims 1 to 14.