基于频谱分析的小电流接地系统单相接地故障选线的研究  

Study of Undercurrent Grounding System in Single-phase Grounding Fault Circuit Selection Based on Spectral Analysis

作　　者：李波[1] 曹旭东[2] 李振刚[1] 王德江[1] 

机构地区：[1]辽宁工业大学信息科学与工程学院,辽宁锦州121001 [2]锦州石化公司,辽宁锦州121001

出　　处：《辽宁工业大学学报（自然科学版）》2008年第1期1-2,6,共3页Journal of Liaoning University of Technology(Natural Science Edition)

基　　金：辽宁省教育厅高等学校科学研究项目(2004D046)

摘　　要：论述了小电流接地系统发生单相接地故障机理,指出了故障线路与健全线路零序暂态电流显著不同,反映零序暂态高频电流特征的频谱差别很大。通过系统仿真分析,得到单相接地故障线路的信号功率最大,以此来鉴别故障线路和健全线路。Fault mechanism of undercurrent grounding system occurred to single-phase grounding was discussed, remarkable difference was pointed out against zero-transient current between fault circuit and perfect circuit. Distinctness on characteristic spectrum of high-frequency zero-transition current was reflected. Through the system simulation analysis, the biggest signal power in fault circuit occurred, single-phase grounding was found which can discriminate fault circuit and sound circuit.

关 键 词：频谱分析 故障选线 DSP FFT 

分 类 号：TM713[电气工程—电力系统及自动化]