低压配电系统用户侧零线、地线接线错误是工程实际中常见的漏电故障，隐蔽性高而定位排查困难，是低压配电系统运维检修中的难题。当前漏电故障用户定位方法难以克服样本量不足及用户间电流多重共线性问题，在用户规模较大的低压供电台区难以快速准确定位漏电故障用户。首先结合目前低压配电系统分级漏保及接地系统防护配置，分析用户侧接线错误漏电故障的影响及危害；进一步研究单个用户及多用户零线、地线接线错误时负荷电流对台区剩余电流的影响差异；考虑台区量测能力限制导致的样本量不足及用户负荷电流曲线之间存在的多重共线性问题，提出基于岭回归的低压配电系统接线错误漏电用户识别方法，可在小样本情况下准确识别漏电故障用户。进一步考虑故障数量及所处相别差异开展不同接线错误漏电故障场景的仿真实验验证了所提方法有效性，并与多元线性回归方法开展对比实验验证了所提方法的优越性。

Neutral and ground lines wiring faults on the user side of low-voltage distribution systems（LVDS） lead to common yet highly concealed leakage current faults in practical engineering, posing significant challenges for operation and maintenance in LVDS. Existing methods for locating leakage faults struggle to address insufficient sample sizes and multicollinearity problems among users currents, making it difficult to rapidly and accurately identify leakage fault users in large-scale low-voltage power substation area. Firstly, the impacts and hazards of user-side wiring faults and leakage faults in the context of current graded residual current protection（RCD） and grounding system protection configurations in LVDS are analyzed. Further, the differences in the impact of load current on residual current in the substation area when there are faults in the neutral and ground wire connections for individual and multiple users are investigated. To address the limitations of insufficient samples due to restricted measurement capabilities in substation area and the multicollinearity among user load current curves, a ridge regression-based method is proposed for identifying leakage user caused by wiring fault in LVDS. This method can accurately identify leakage fault user in small sample sizes. Further considering the number of faults and the differences in their phases, simulation experiments of different wiring fault leakage cenarios are carried out to verify the effectiveness of the proposed method, and comparative tests against multiple linear regression method demonstrate its superiority.