摘要
在电力系统中,交流电流回路对保障系统安全运行起到非常重要的作用。电流互感器二次绕组的二次回路只允许且仅有一个可靠的接地点,并且电流回路在保护屏或开关场一点接地。在实际工作中常常由于各种因素,会出现一个电气连接的二次回路中出现多点接或不接地的情况。某发电厂因交流电流回路未接地,直接导致保护装置的不正确动作。通过查阅设计图纸、现场接线和理论分析,解决了现场交流电流二次回路无接地造成保护装置误动作的问题。
In the electronic power system, the AC current loop plays a very important role in ensuring its safe operation. The secondary loop of the secondary winding of the current transformer allows and has only one reliable grounding point, and the current loop can only be grounded at one point, namely protective screen or switching station. In practice, multi-point grounding or non-grounding may appear in the secondary loop of an electrical connection on account of various factors. This paper described improper operation of the protective device directly attributable to an ungrounded AC current loop in a certain power plant. This malfunction caused by ungrounded secondary AC current loop in the field was removed by consulting design drawings, checking field wiring and making theoretical analysis.
作者
王永年
崔力心
赵红
张光儒
郭文科
Wang Yongnian;Cui Lixin;Zhao Hong;Zhang Guangru;Guo Wenke(State Grid Gansu Electric Power Co., Electric Power Research Institute, Lanzhou Gansu 730070, China)
出处
《电气自动化》
2019年第4期5-7,共3页
Electrical Automation
关键词
变电站
电流回路
接地
事故分析
防范措施
substation
current loop
grounding
accident analysis
precautionary measure
