摘要
针对日常工作中存在的对直流系统一点接地现象忽视大意,致使发展成两点接地,引起严重后果的现象。通过对一起直流系统两点接地引起主变重瓦斯保护误动事故的发生过程、原因分析、处理情况的介绍,指出直流系统两点接地的危害,提出相应的预防措施:在当直流系统发生接地时,禁止在二次回路上工作;对新接入的设备(回路),均需做好绝缘检查。
Neglect of one-point grounding phenomenon of DC system may lead to serious fault of two-point grounding. An introduction was made on the process, causes and treatment of a heavy gas protection misoperation accident of main transformer, based on which the author discussed the harm of two-point grounding of DC system which had led to that accident, and put forward corresponding prevention measures. In case of grounding fault of DC system, it shall be to prohibited to operate in secondary circuit, and the device or circuit to be connected into shall be subject to careful insulation inspection.
出处
《广西水利水电》
2013年第2期74-75,81,共3页
Guangxi Water Resources & Hydropower Engineering
关键词
直流系统
两点接地
继电保护
误动
DC system
two-point grounding
relay protection
misoperation
