In order to analyze rail potential distribution in AT-fed traction power networks , the system reduc-tion method was used to reduce the system size .Currents induced by Conductors T and F in the grounding re-turn network were calculated with the extended decoupled method . On the basis of the multi-conductor trans-mission line theory , rail potential distribution was derived . The proposed method could be used to any com-plex grounding networks ,and its storage capacity and calculation burden were less than chain circuit model . Simulation shows that the results of the proposed method are consistent with the results of the chain circuit model . Finally , safety of rail potentials was evaluated according to IEC Standard 62128-1 .%为解决AT牵引网的钢轨电位分析问题，本文使用导体合并算法对牵引网进行合并、简化，基于扩展解耦法计算出其他导体对接地回流网络的感应电流，并使用多导体传输线理论计算钢轨电位的分布。该算法可对任意复杂的接地网络进行分析，且存储容量、计算量均较牵引网链式电路模型少。仿真结果表明：该算法与牵引网链式电路模型计算结果相吻合。根据IEC标准62128-1对钢轨电位的安全性进行了评估。
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