电力系统及其自动化学报

谐振接地配电网发生单相接地故障，尤其是高阻接地故障时，单一稳态故障特征或暂态故障特征难以实现故障线路的准确识别。本文提出一种多特征融合的配电网单相接地故障选线方法，从理论上推导出不受故障点接地电阻影响的稳态故障特征，并与暂态故障特征和综合相似系数相结合，利用半参数copula模型得出多特征融合故障矩阵，以完成故障线路的有效判定。为实现高阻接地故障中各故障特征的有效提取，选择经改进小波阈值去噪后的零序电流波形，并适时并入并联电阻以放大故障特征。仿真结果表明本文方法可以有效解决各类配电网单相接地故障选线困难的问题，且选线过程抗干扰能力较强，灵敏度较高，与其他融合特征方法对比具有显著优势，可以满足实际工程需求。

In case of single-phase earth fault in a resonance-earthed medium-voltage distribution network， especially a high-resistance grounding fault， it is difficult to accurately identify the faulty line using a single steady-state fault characteristic index or transient fault characteristic index.To address this issue， this paper starts with the principle of formulas， derives steady-state fault characteristic values that are not affected by the grounding resistance at the fault point， and combines them with transient fault characteristic quantities. Using a semi-parametric copula model， a multi-feature fusion fault matrix H is obtained to effectively determine the faulty line.To facilitate the effective extraction of various fault characteristics in high-resistance grounding faults， this paper selects zero-sequence current waveforms after improved wavelet threshold denoising， and timely incorporates parallel resistors to amplify the fault characteristics.Multiple simulation results show that the method proposed in this paper can effectively solve the problem of difficult selection of the faulty line in single-phase high-resistance grounding faults in distribution networks， and the selection process has strong anti-interference capability， meeting the needs of practical engineering.