电力系统保护与控制2011，Vol.39Issue(20)：145-150,6.
负荷电流下并联电抗器差动误动现象及解决措施
Phenomenon and resolution of differential protection mal-operation for shunt reactor under load current
宋志明 1余高旺 2邢文 2樊占峰 2杨恢宏2
作者信息
- 1. 山东省电力学校,山东泰安271000
- 2. 许继电气技术中心,河南许昌461000
- 折叠
摘要
Abstract
Aiming at the examples of mulfunction of differential protection of shunt reactors when the reactor is energized on no-load, this paper analyzes and discusses the current transformer (CT) saturation under the load current. It points out that a large fault current is not a necessary condition for CT saturation occurrence, under the condition of non-periodic component, the normal load may also cause CT saturation. This paper analyzes the reason of CT saturation, points out in the reactor dropped, if the load current contains a very large decaying, CT saturation will occur. It illustrates the difference between the case and CT saturation caused by carge current, that is, such a saturation phenomenon has the characteristics of long duration, no significant waveform distortion, less harmonic content, and the poor flow is mainly caused by the phase shift occurred. The paper also points out that the phenomenon has a very negative impact on the reactor current differential and zero-sequence current differential, differential protection should take measures to prevent the occurrence of malfunction. And reactor current differential solution and the reactor zero-sequence current differential solution are proposed.关键词
并联电抗器/分相电流差动保护/零序电流差动保护/电流互感器( CT)/CT饱和Key words
shunt reactor/ dispersed phase current differential protection/ zero-sequence current differential protection/ current transformer (CT)/ current transformer saturation分类
信息技术与安全科学引用本文复制引用
宋志明,余高旺,邢文,樊占峰,杨恢宏..负荷电流下并联电抗器差动误动现象及解决措施[J].电力系统保护与控制,2011,39(20):145-150,6.
