针对配电网谐振接地系统发生单相接地故障选线存在较大困难的问题，提出一种利用故障暂态阶段零序电流波形相似度的故障选线方案。分析谐振接地系统等值零序网络发现：健全线路在故障暂态的零序电流方向为由母线流向线路，而故障线路的零序电流方向为由线路流向母线。鉴于此，采用改进平均巴氏距离来表征线路波形差异度，根据健全线路平均巴氏距离趋近于0的特征构建相应的选线判据及选线方案。利用Matlab建模，验证该选线方案准确率高，且在不同过渡电阻、故障位置等故障情形下均适用，还具有良好的抗噪性能。

In order to solve the problem of single-phase grounding fault line selection in resonant grounded system of distribution network, a fault line selection scheme based on the similarity of zero sequence current waveform in fault transient phase is proposed. By analyzing the equivalent zero-sequence network of the resonant grounded system, it is found that the zero-sequence current direction of the sound line is from the bus to the line at the fault transient stage, while the zero-sequence current direction of the fault line is from the line to the bus. In view of this, the improved average Bhattacharyya distance is used to characterize the difference of line waveform, and the corresponding line selection criteria and scheme are constructed according to the characteristics of the average Bhattacharyya distance of the sound line approaching zero. Using Matlab modeling, it is verified that the line selection scheme has high accuracy, is applicable to different fault situations such as transition resistance and fault location, and has good anti-noise performance.