基于低频部分元等效电路（PEEC）模型计算接地回路电流和电势分布，研究分析了共地传导干扰机理。基于混合位积分方程建立了低频PEEC模型，并与边界元方法的结果对比验证其准确性。基于PEEC模型实现对导体中三维电流分布的计算，获得了典型大导体接地回路的电流分布，分析了频率对电流分布的影响特性。结果表明，地导体中电流分布主要集中在接地极附近，两接地极间会由于电感感抗的影响而呈现出电势差，揭示了接地回路中的共地传导干扰机理，建立的PEEC模型能够有效应用于共地干扰分析与抑制。

Based on low-frequency partial element equivalent circuit (PEEC) method, the current and potential distribution of the ground loop is presented, and the mechanism of common ground conducted interference is analyzed in this paper. Our proposed low-frequency PEEC model is achieved based on mixed potential integral equation (MPIE), and its accuracy is verified by comparing with the results of boundary element method. By realizing the three-dimensional current distribution calculation with the PEEC model, the current distribution of a typical large conductor ground loop and the effects on the current distribution due to frequency are achieved. The results demonstrate that current distribution of ground conductor is mainly concentrated in the vicinity of the ground electrode, and a potential difference is observed between two ground electrode because of the influence of inductance, which reveals the mechanism of common ground conducted interference in the ground loop. The proposed PEEC model is able to analyze the common ground interference and applied in interference suppression.