利用暂态电流Hausdorff距离的谐振配电网故障选线方案

Fault line selection scheme using the Hausdorff distance of transient current in resonant distribution networks

针对谐振接地配电网系统高阻单相接地故障时无法可靠准确进行故障选线的问题,提出一种利用暂态高频电流波形差异的故障选线方案。通过分析谐振接地系统单相接地故障时的零序电流特征,发现健全线路与故障线路的暂态电流5、7次分量的波形依旧存在明显差异。利用Hausdorff距离算法比较线路间的暂态电流主要高频分量的波形差异进行故障选线。对各线路的暂态电流分量进行归一化处理,构造了暂态电流分量Hausdorff距离参数的故障选线判据,并设计了故障选线的实现方案。利用Matlab仿真以及试验录波进行计算分析,验证了所提出选线方案的正确性和有效性,尤其是对于配电网高阻单相接地故障具有良好的适用性。

Since fault line selection cannot be performed reliably and accurately when a high-resistance single-phase grounding fault occurs in a resonant grounded distribution network system,a scheme based on the difference of transient high-frequency current waveform is proposed.Analyzing the zero-sequence current characteristics of a single-phase grounding fault system in a resonant grounding system,there are still significant differences in the waveforms of the fifth and seventh components of the transient current between the sound line and the fault line.The Hausdorff distance algorithm is used to compare the waveform differences of the main high-frequency components of the transient current between lines for fault line selection.Through the normalization of the transient current component of each line,the fault line selection criterion of the Hausdorff distance parameter of that component is constructed,and an implementation scheme is designed.The correctness and effectiveness of the proposed line selection scheme are verified by Matlab simulation and test recording,especially for a high-resistance single-phase grounding fault in a distribution network.