摘要
介绍了一起由于空载合闸引起励磁涌流导致某220kV变压器差动保护误动的故障情况,从保护定值检查、保护动作报文查检、保护动作分析等方面分析故障产生的原因,提出应对措施,对防止差动保护误动和提高冲击合闸成功率提供了参考。
A misoperation of a 220 kV transformer differential protection caused by excitation surge current induced by no-load switching-in is introduced.Causes of this misoperation are identified.In addition,preventive methods and operational suggestions to avoid the malfunction under inrush conditions are proposed which have theoretical values for improving the reliability of differential protection of transformers.
作者
王佼
刘钊
杨彬
高岩
Wang Jiao Liu Zhao Yang Bin Gao Yan(State Grid Hebei Electric Power Corporation Baoding Power Supply Branch, Baoding 071000,China)
出处
《河北电力技术》
2017年第3期37-39,共3页
Hebei Electric Power
关键词
励磁涌流
差动保护
二次谐波
误动
excitation surge current
differential protection
second harmonic
malfunction
