500kV线路断路器跳位延迟返回对保护功能影响分析及解决措施

Analysis of the influence of 500kV line circuit breaker tripping delay return on protection function and its countermeasures

部分型号500kV线路断路器存在跳位延迟返回的现象,与继电保护功能配合存在问题。本文分析500kV线路断路器跳位延迟返回对继电保护功能的影响,指出跳位返回迟滞可能导致线路单相故障时重合失败,以及断路器死区保护功能无法正确实现。从规划设计和二次回路完善的角度,提出优化设备选型、改接断路器辅助触头、优化合闸回路等解决措施。

Some 500kV line circuit breakers have the phenomenon of delayed return from tripping,and there are problems in coordination with the relay protection function.This paper analyzes the influence of the delayed return of the 500kV circuit breaker tripping position on the relay protection function,and points out that the hysteresis of the tripping position return may lead to the failure of reclosing in the single-phase fault of the line and the failure of the circuit breaker dead zone protection function.From the perspective of planning and design and the improvement of the secondary circuit,solutions such as optimizing equipment selection,changing the auxiliary contacts of the circuit breaker and optimizing the closing monitoring circuit are proposed.