Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker, which comprises a framework, a fixed sealing pole post and an operation shaft, wherein the fixed sealing pole post is fixed on the framework, and comprises a pole post body, a vacuum arc extinguishing chamber and an insulation pull rod; the vacuum arc extinguishing chamber is positioned inside the pole post body; the insulation pull rod is connected with the vacuum arc extinguishing chamber; an insulation cavity is formed inside the pole post body; the insulation pull rod is positioned in the insulation cavity; an outer wall umbrella skirt edge is arranged on the outer wall of the pole post body; the inner wall of the insulation cavity is provided with an inner wall umbrella skirt edge; the surface position of the insulation pull rod is provided with an insulation pull rod skirt edge; the operation shaft is arranged above the framework, is connected with the insulation pull rod, drives the insulation pull rod to act and further controls a movable conducting rod and a static conducting rod of the vacuum arc extinguishing chamber to separate or combine. Through the designs of the outer wall umbrella skirt edge, the inner wall umbrella skirt edge and the insulation pull rod umbrella skirt edge, the vacuum circuit breaker provided by the invention has the advantages that the creep distance is increased under the condition of certain volume; the requirement of small size of the vacuum circuit breaker is met.

Description

technical field [0001] The invention relates to a high-voltage circuit breaker, in particular to a miniaturized vacuum circuit breaker. Background technique [0002] In the field of high-voltage switches, the use of vacuum circuit breakers has become more common, such as 12kV outdoor column-mounted vacuum breakers, 12kV indoor fixed switchgear, and vacuum circuit breakers for central switchgear. At present, the external insulation of the fixed switchgear and the central switchgear is all air insulation. Due to the large insulation distance of the air, the vacuum circuit breaker in the prior art usually has a relatively large volume. [0003] With the improvement of power supply reliability and the rapid development of urban and rural power grids, the gas-filled switchgear with SF6 (sulfur hexafluoride) gas as the external insulation and vacuum arc extinguishing as the internal insulation has developed rapidly, and its application is becoming more and more widely. And SF6 g...

AI Technical Summary

Problems solved by technology

And SF6 gas is listed as one of the six gases with greenhouse effect, and SF6 gas will decompose into toxic low-fluoride gas after arc discharge, so the power switch of SF6 gas insulating medium is also restricted.

Images