110kV线路故障导致变压器保护动作分析

Analysis of Transformer Protective Action Caused by 110 kV Line Fault

对110 kV变压器中性点过电压问题、接地方式的控制以及目前大同电网110 kV变压器零序过电压保护设计存在的安全隐患等进行了初步探讨,提出加大部分中性点间隙或提高动作值,改善变压器零序保护配合的措施。

Neutral point over-voltage problem of 110 kV transformer and the control of grounding mode are explored in this paper.Besides,zero-sequence over-voltage protection of 110 kV transformer in Datong power grid is discussed in terms of the potential security trouble in design.It is suggested to widen the protective gap of neutral point or increase the action value and adopt suitable measures to improve transformer zero-sequence protection.