华电技术 ›› 2012, Vol. 34 ›› Issue (12): 56-57.

• 技术交流 • 上一篇    下一篇

线路交叉故障引发主变压器差动保护动作分析

朱绍唐   

  1. 武威供电公司,甘肃武威733000
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2012-12-25

Analysis on tripping of main transformer differential protection caused by fault in cross point of lines

ZHU Shaotang   

  1. Wuwei Power Supply Company, Wuwei 733000, China
  • Received:1900-01-01 Revised:1900-01-01 Published:2012-12-25

摘要: 针对某变电站110kV线路与35kV线路交叉点击穿后引发主变压器差动保护越级跳闸,区外B相接地故障,区内C相避雷器击穿的情况,结合动作报告和波形,采用故障序分量分析法分析了原因,提出了改进方案,防止类似事故再次发生。

关键词: 单相接地, 避雷器击穿, 差动保护, 输电线路

Abstract: A breakdown accident occurred in the cross point of the 110kV line and the 35kV line of a substation and caused that the main transformer differential protection skiplevel tripped, a grounding fault occurred in the outside B phase and a lightning arrester breakdown accident occurred in internal C phase. Combining with the tripping report and the waveform, using the fault sequence component analysis method, the reasons of the accident were analyzed, and the improvement scheme was proposed to prevent similar accident.

Key words: single phase grounding, lightning arrester breakdown, differential protection, power transmission line