电力系统保护与控制2017，Vol.45Issue(6)：9-15,7.DOI:10.7667/PSPC160467
一种新的谐振接地系统单相接地故障选线方法
A fault line selection method for resonant earthed system with high accuracy
摘要
Abstract
To solve the problem of low accuracy of fault line selection in resonant earthed system when the fault switching angle is small,a novel fault line selection method is proposed by taking the advantage of Ensemble Empirical Mode Decomposition (EEMD) and Hilbert-transform in frequency band analysis.By analyzing the distribution characteristics of transient zero sequence current and comparing the energy of transient capacitance current with that of decaying DC component,the signal with higher energy is used for fault line selection adaptively.When the energy of transient capacitance current is higher,the fault line is identified by comparing the polarity of transient capacitance current.When the energy of decaying DC component is higher,the fault line is identified by comparing the decaying DC component energy of arc suppression coil with that of primary selection line.Simulations of single-phase earth fault under different switching angle and transition resistance conditions have been done,the results show that the proposed method has high accuracy and can select the fault line even in small fault switching angle occasions.The proposed method may take effect in its applications.关键词
谐振接地系统/单相接地故障选线/小故障合闸角/衰减直流分量/EEMD/希尔伯特变换Key words
resonant earthed system/fault line selection of single-phase grounding/small fault switching angle/decaying DC component/EEMD/Hilbert transform引用本文复制引用
宋金钊,李永丽,石峥,马立凡..一种新的谐振接地系统单相接地故障选线方法[J].电力系统保护与控制,2017,45(6):9-15,7.基金项目
国家自然科学基金项目(51177108,51577128)This work is supported by National Natural Science Foundation of China (No.51177108 and No.51577128). （51177108,51577128）
