Research on Fault Location Algorithm of Multiple Single\|PhaseGrounding Faults Occurring in Isolated Neutral System
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摘要: 针对单纯使用比幅法或比相法只能得到一处故障区段位置的缺点, 提出了一种适用于中性点不接地系统多重单相接地故障的故障区段定位算法。该算法通过分析中性点不接地配电系统发生多重单相接地故障的情况, 提出利用比幅法的原理建立网络描述矩阵, 接着按照特定的算法对其修正, 再得到故障判断矩阵, 根据故障判断矩阵, 得出故障点区段, 最后根据比相法的判断依据排除可能误判的故障区段, 并确定故障路径上及电源侧各支路前两个馈线终端单元(FTU)之间可能存在的故障区段。MATLAB仿真实验验证了该算法的正确性与可行性。Abstract: Only one fault section can be diagnosed by the amplitude\|comparison or phase\|comparison method, so a fault section location algorithm which is suitable for locating multiple single\|phase grounding faults in isolated neutral system is proposed in this paper. Through analyzing the phenomenon of multiple single\|phase grounding faults occurring in isolated neutral system, the network describing matrix is built by using of the amplitude\|comparison method. Then it is modified according to specified algorithm, and the fault judgment matrix is obtained, by which the fault section can be determined. In addition, the fault section that may be mal\|judged is eliminated by phase\|comparison method, and possible fault sections located between first two feeder terminal units (FTU) on fault paths and on each line at power source side are determined. In the end, MATLAB simulation results verify the correctness and feasibility of this algorithm.
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Keywords:
- fault location /
- multiple faults /
- zero sequence voltage /
- amplitude\ /
- comparison method
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