摘要
在中性点非直接接地系统中发生单相接地时,因接地电流很小,一般不会导致电流保护动作。但在某变电站中因一次接线原因在发生单相接地时,导致了主变差动保护动作,在分析动作原因的基础上,对此种接线方式可能引起的危害进行了初步分析,提出了解决方法。
When single-phase-to-earth fault occurs in non-direct-grounding neutral system, the current relay generally will not operate since the amplitude of grounding current is too small. But when such fault occurred in a station discussed in this paper, the differential protection of main transformer operated because of its inappropriate main electric connection. Based on the malfunction analysis, the harm brought by such main electric connection is discussed primarily and a solution is proposed.
出处
《继电器》
CSCD
北大核心
2008年第1期87-89,共3页
Relay
关键词
中性点不接地系统
单相接地
差动保护
non-direct-grounding neutral system
single-phase-to-earth fault
differential protection
