永磁操动机构特性分析和配用于高压真空断路器的可能性

Pre-discharge Current Characteristics of the SF_6 Gap and Spacer Stressed by VFTO

本文介绍了永磁操动机构的工作原理 ,分析了永磁操动机构的特性 ,并探讨了其配用于高压真空断路器的可能性。

Predischarge current in the SF 6 gap and on the spacer surface is detected. The measuring results show that the breakdown characteristics under the positive VFTO conform to the leader mechanism. But under negative VFTO, the streamer may cause the breakdown directly. Gas pressure has a direct effect on the leader step length and time interval. The back discharge phenomenon is probably a reason for lowering the flashover voltage of the spacer stressed by VFTO.