电力系统保护与控制2011，Vol.39Issue(12)：27-30,4.
一种防止外部故障切除后变压器差动保护误动的新算法
A new algorithm to prevent the mal-operation of transformer differential protection after removing external fault
金恩淑 1孙世勇 1齐正 2吴颖 1陈险峰 1戈政1
作者信息
- 1. 东北电力大学电气工程学院,吉林吉林132012
- 2. 清华大学电机系,北京100084
- 折叠
摘要
Abstract
The mal-operation of the transformer differential protection occasionally takes place after external fault being removed.At present, the mal-operation is prevented by means of changing the acting area and braking area of differential protection, which adversely affects the clear of transitional fault.This paper analyses the differential current harmonic component by simulation, a new algorithm is proposed according to the features that the triple frequency harmonic is greater than the second harmonic in the period of the mai-operation.The new algorithm is based on the differential protection of the second harmonic braking, and the new braking criterion is presented using the rate of the second harmonic and the triple frequency harmonic in the fundamental harmonic.Simulation results show that the new algorithm is simple and effective, can avoid the mai-operation, and clear transformer transitional fault quickly.关键词
变压器/差动保护/CT饱和/三次谐波/转换性故障Key words
transformer/ differential protection/ CT saturation/ triple frequency harmonic/ transitional fault分类
信息技术与安全科学引用本文复制引用
金恩淑,孙世勇,齐正,吴颖,陈险峰,戈政..一种防止外部故障切除后变压器差动保护误动的新算法[J].电力系统保护与控制,2011,39(12):27-30,4.
