CN-224203988-U - Arc extinguishing system and switch cabinet

Abstract

An arc extinguishing system and a switch cabinet, wherein the arc extinguishing system is arranged in the switch cabinet. The arc extinguishing system comprises a fixed contact, an arc extinguishing chamber configured to extinguish an arc, an electrical connection member having a cylindrical shape, the fixed contact being electrically connected to the arc extinguishing chamber via the electrical connection member, wherein the arc extinguishing system further comprises a heat sink arranged between the fixed contact and the arc extinguishing chamber, the heat sink at least partially surrounding the electrical connection member, the heat sink being configured to dissipate heat at the electrical connection member to the outside.

Inventors

• TANG MIN
• LU HAIFENG
• LIU FEI
• ZHAO ZILEI

Assignees

• 施耐德电气工业公司

Dates

Publication Date

20260505

Application Date

20250506

Claims (12)

1. 1. An arc extinguishing system, comprising: A stationary contact; an arc extinguishing chamber configured to extinguish an arc; An electrical connector having a cylindrical shape, the stationary contact being electrically connected to the arc extinguishing chamber via the electrical connector; Wherein the arc extinguishing system further comprises a heat sink arranged between the stationary contact and the arc extinguishing chamber, the heat sink at least partially surrounding the electrical connection, the heat sink being configured to dissipate heat at the electrical connection to the outside.
2. 2. The arc suppression system of claim 1 wherein the heat sink comprises a housing having a smooth shape and fins disposed inside the housing.
3. 3. The arc extinguishing system according to claim 2, wherein the extent of the housing does not exceed the extent of the arc chute in a lateral direction, the lateral direction being perpendicular to the axial direction of the electrical connection.
4. 4. The arc suppression system of claim 2 wherein the housing has a first portion and a second portion, the first portion being rounded and the second portion being chamfered rectangular.
5. 5. The arc extinguishing system according to claim 2, wherein the fins have a circular profile or a rectangular profile.
6. 6. The arc extinguishing system according to claim 1, characterized in that a gap is present between the heat sink and the stationary contact and/or a gap is present between the heat sink and the arc extinguishing chamber.
7. 7. The arc extinguishing system according to claim 1, wherein the circumferential surface of the electrical connection is provided with grooves, which grooves are recessed inwards in the radial direction of the electrical connection.
8. 8. The arc extinguishing system of claim 1, further comprising a fastening screw passing through the stationary contact, the electrical connection, and the arc chute in sequence to secure the stationary contact, the electrical connection, and the arc chute together.
9. 9. The arc suppression system of claim 1, further comprising a first limit screw passing through the stationary contact and the electrical connector and a second limit screw passing through the arc chute and the electrical connector, the first limit screw and the second limit screw configured to limit displacement of the electrical connector in a lateral direction.
10. 10. The arc suppression system of claim 1 wherein the electrical connection is made of copper and the heat sink is made of aluminum.
11. 11. A switchgear cabinet characterized in that the arc extinguishing system according to any of claims 1-10 is arranged in the switchgear cabinet.
12. 12. The switchgear cabinet according to claim 11, characterized in that the cabinet is filled with dry air.

Description

Arc extinguishing system and switch cabinet Technical Field The utility model relates to an arc extinguishing system and a switch cabinet, in particular to an arc extinguishing system with better heat dissipation performance and a corresponding switch cabinet. Background In medium voltage switchgear, good insulation and heat dissipation properties are critical. Sulfur hexafluoride has good insulating property and heat dissipation property, so that the sulfur hexafluoride is widely used in medium voltage switch cabinets. Sulfur hexafluoride, however, causes a serious greenhouse effect, and its global warming potential is 25200 times that of carbon dioxide. In order to meet the requirements of green environmental protection, sulfur hexafluoride is being replaced by dry air in the gas filled medium voltage switchgear, but this causes a decrease in the insulation and heat dissipation properties of the switchgear. For this reason, it is desirable to propose an arc extinguishing system and a switchgear that ameliorate the above drawbacks of the prior art. Disclosure of utility model According to a first aspect of the utility model, an arc extinguishing system is proposed, comprising a stationary contact, an arc extinguishing chamber configured to extinguish an arc, an electrical connection having a cylindrical shape, the stationary contact being electrically connected to the arc extinguishing chamber via the electrical connection, wherein the arc extinguishing system further comprises a heat sink arranged between the stationary contact and the arc extinguishing chamber, the heat sink at least partly surrounding the electrical connection, the heat sink being configured to dissipate heat at the electrical connection to the outside. According to the scheme, the radiator is arranged between the fixed contact and the arc extinguishing chamber, so that heat generated by the arc extinguishing system can be fully dissipated to the outside, and the heat dissipation performance of the switch cabinet is improved. In some aspects, the heat sink may include a housing having a smooth shape and fins disposed inside the housing. According to the scheme, the shell has a smooth shape, so that electric field distribution in the switch cabinet is more uniform, and the insulating performance of the switch cabinet is improved. In some aspects, the housing may not extend beyond the arc chute in a lateral direction that is perpendicular to the axial direction of the electrical connector. According to this scheme, set up the radiator and can not reduce alternate insulation distance to can not reduce the insulating properties of cubical switchboard. In some aspects, the housing may have a first portion that is rounded and a second portion that is rounded rectangular. In some aspects, the fins may have a circular profile or a rectangular profile. In some aspects, a gap may exist between the heat sink and the stationary contact, and/or a gap may exist between the heat sink and the arc chute. According to the scheme, gaps are respectively formed between the radiator and the fixed contact and between the radiator and the arc extinguishing chamber, so that gas convection in the switch cabinet is more sufficient, heat can be taken away better, and the heat dissipation performance of the switch cabinet is improved. In some aspects, the electrical connector has a groove on a circumferential surface thereof, the groove being recessed inwardly in a radial direction of the electrical connector. According to this solution, the heat sink is partly embedded in the recess in the electrical connection, so that the fixation between the heat sink and the electrical connection is more secure. In some aspects, the arc extinguishing system may further include a fastening screw passing through the stationary contact, the electrical connection, and the arc extinguishing chamber in order to fix the stationary contact, the electrical connection, and the arc extinguishing chamber together. According to this solution, the heat sink is fixed between the stationary contact and the arc extinguishing chamber by the fastening screw without additional fixing means. In some aspects, the arc extinguishing system may further include a first limit screw passing through the stationary contact and the electrical connection, and a second limit screw passing through the arc extinguishing chamber and the electrical connection, the first limit screw and the second limit screw configured to limit displacement of the electrical connection in a lateral direction. According to this scheme, stop screw prevents that the electric connection piece from unexpected lateral displacement and lead to insulating distance reduction to improve the insulating properties of cubical switchboard. In some aspects, the electrical connector may be made of copper and the heat sink may be made of aluminum. According to a second aspect of the utility model, a switchgear is proposed, in which the arc exting