中国电机工程学报Issue(31)：147-154,8.
基于接地电流的大型发电机定子接地保护及精确定位方法
A Novel Protection and Precise Location Method Based on Grounding Currents for Stator Ground Faults of Large Generators
王育学 1尹项根 1张哲 1李振兴 1袁艺1
作者信息
- 1. 强电磁工程与新技术国家重点实验室 华中科技大学，湖北省 武汉市 430074
- 折叠
摘要
Abstract
To avoid the shock to power systems due to unnecessary shedding of large generator, this paper proposed a novel stator-ground fault protection principle based on grounding currents for large generators. A method of calculating grounding currents was derived from the zero-sequence equivalent circuit of generators with single-phase ground faults. If the grounding current exceeds the allowable value, the protection would trip immediately, otherwise it would only send warning signals to inform the operator to remove faults. Besides, to reduce the repair time, an automatically locating method for stator ground faults was presented according to the features of stator windings of multi-branch large generators. The method can detect the faulted phase, faulted branch and faulted coils. The detailed process and implementing scheme were given. A model that can simulate inner ground faults of generator was built. The simulation results verify the validity and rationality of the proposed protection method. The accuracy of the fault location method is proved.关键词
大型发电机/定子接地/零序网络/接地电流/故障定位Key words
large generator/stator ground fault/zero sequence equivalent network/ground current/fault location分类
信息技术与安全科学引用本文复制引用
王育学,尹项根,张哲,李振兴,袁艺..基于接地电流的大型发电机定子接地保护及精确定位方法[J].中国电机工程学报,2013,(31):147-154,8.
