摘要
小电流接地系统发生最多的故障是单相接地故障。现有的基于稳态零序电流的故障选线方法 ,受弧光接地、运行方式等因素的影响较大 ,选线精度并不理想。文中在充分研究电弧故障暂态零序电流变化的基础上 ,指出电弧因素对故障选线准确性的影响。由于对称分量法对接地故障进行暂态分析十分不便 ,文中采用 Clarke变换 ,并运用小波变换技术建立新的基于暂态电气量的选线方法。应用 EMTP对电弧接地故障进行了仿真 ,在不同采样频率以及不同的 A/D分辨率情况下进行了大量的仿真试验 ,结果表明新方法是正确、有效的 。
Most faults in the system which has little short circuit current when it faults to ground via single-phase are single-phase grounding. For the methods with steady zero sequence currents are effected by arcing, operating manner, etc., the accuracy of fault line selection is not satisfied. In this paper, after detailed study of the variation of zero-sequence currents during arcing fault, the disadvantageous effects of arcing on the accuracy of fault line selection are listed. Because symmetry component method is very inconvenient for the transient analysis of grounding fault, the techniques of wavelets and Clarke's transform are used to develop the criterion of fault line selection. Afterwards EMTP is employed to achieve the simulation of arcing faults. Simulation results, which are obtained under different sampling frequency and A/D resolution conditions, show the novel method is correct, effective and robust.
出处
《电力系统自动化》
EI
CSCD
北大核心
2002年第21期58-61,共4页
Automation of Electric Power Systems
基金
云南省科技攻关项目 (15 B2 - 0 2 )
云南省应用基础研究项目(98E0 40 9M
99E0 0 6 G)
云南省中青年学术和技术带头人培养经费资助项目
关键词
配电网
单相电弧接地
故障选线
暂态分析法
消弧线圈
电磁暂态
小波变换
distribution system
fault line selection
arc suppressing coils
electro-magnetic transients
wavelets transform
arcing fault
