为了解决谐振接地配电系统单相高阻接地的故障选线问题，提出一种利用中性点并联电阻投入前后零序电流扰动特征的故障选线方案。建立消弧线圈并联小电阻投入前、后两阶段的零序故障模型，分析健全线路、故障线路在两个阶段的零序电流变化特征，健全线路的零序电流在并联电阻投入后其幅值呈减小状态，而故障线路零序电流则呈增大状态。进一步基于并联电阻投入前、后两阶段线路零序电流的幅值扰动特征构造相应的故障选线判据。MATLAB仿真计算验证所提方法的正确性和有效性。结果表明：所提方案对于不超过5 kΩ的高阻单相接地故障能够可靠检测。

In order to solve the fault line selection problem of single-phase high resistance grounding in resonant grounded distribution systems, a fault line selection scheme was proposed that utilized the disturbance characteristics of zero-sequence current before and after the neutral point parallel resistor was grounded. The zero-sequence fault model was established for the two conditions before and after the resistor paralleling with the arc suppression coil, and the zero-sequence current variation characteristics of sound and faulty lines were analyzed correspondingly. The amplitude of the zero-sequence current of any healthy line decreased after the neutral resistance was applied, while the current of the faulty line increased. Furthermore, a fault line selection criteria was constructed, which was used the amplitude disturbance characteristics of the zero-sequence currents. Simulations based on MATLAB verified the correctness and effectiveness of the proposed method. The results show that the proposed scheme is able to reliably detect single-phase ground fault with the resistance up to 5 kΩ.