中文摘要：

通过分析带并联电抗器的输电线路在单相接地故障不同故障性质下的故障特征,提出了基于最小二乘法的波形相关性的永久性故障判别方法。以瞬时性故障恢复电压阶段的等效模型为参考模型,通过时域波形相关性的方法得到故障相端电压计算值与实际值的相似度,利用相似度构造目标比例系数与整定值连续比较判断故障性质。该方法仅利用并联电抗器中的电流量及非故障相的单端电气量就可以实现故障性质的判断。大量仿真实验表明,该方法在不同运行条件下能够准确地判断出故障性质,即使在较大的模型参数误差情况下,也能实现永久性故障时断路器可靠不重合的目标。

英文摘要：

Through the analysis of different fault characteristics under single-phase earth fault for transmission lines with shunt reactors, a permanent fault identification method based on least squares waveform correlation is presented. The equivalent model of voltage recover interval of transient fault is used as a reference prototype, the similarity of calculated value and measured value on fault-phase terminal voltage is obtained with time domain waveform correlation method, and then identifies the fault nature by continuously comparing objective proportional coefficient constructed with the similarity to setting value. The method can identify fault nature just with the current of shunt reactors and single-terminal data of non-fault-phase. Lots of simulation results show that the proposed method can exactly distinguish permanent fault from transient fault on different conditions, even in comparatively large model parameter errors case can achieve the goal of reliable misalignment in permanent fault.