电力系统自动化2013，Vol.37Issue(2)：130-133,4.DOI:10.7500/AEPS201208024
电流互感器二次回路短路导致差动保护动作机理分析
Mechanism Analysis on Differential Protection Action Caused by Short-circuit Fault of Current Transformer Secondary Circuit
郭自刚 1税少洪 1徐婷婷 2张琦雪 1陈俊 1陈佳胜1
作者信息
- 1. 南京南瑞继保电气有限公司,江苏省南京市211102
- 2. 南京电力工程设计有限公司,江苏省南京市210009
- 折叠
摘要
Abstract
The equivalent circuit and phasor diagram of inter-phase short-circuit fault of current transformer (CT) secondary circuit are proposed. The effect of short circuit fault via transition resistance in CT secondary circuit on current sampling of protective device and differential protection is analyzed. The results show that the current amplitude of fault phases decrease and the phase angles of fault phases change, which generates differential current in differential protection circuit and may cause differential protection tripping. A case of real differential protection wave is used to validate the correctness of above analysis results. Finally, for such faults, some prevention measures and suggestions are put forward.关键词
电流互感器/二次回路/短路/差动保护Key words
current transformer/ secondary circuit/ short-circuit/ differential protection引用本文复制引用
郭自刚,税少洪,徐婷婷,张琦雪,陈俊,陈佳胜..电流互感器二次回路短路导致差动保护动作机理分析[J].电力系统自动化,2013,37(2):130-133,4.
