配电网单相电弧接地故障选线暂态分析法

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，结果表明该方法是正确，有效的，而且具有较强的鲁棒性。

A TRANSIENT-BASED STUDY OF FAULT LINE SELECTION FOR SINGLE-PHASE TO GROUND FAULTS ON DISTRIBUTION SYSTEM

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.