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为了精确地描述行波在架空配电线路上的传播过程，挖掘所携带的故障信息应用于故障检测，结合配电线路特点，就三相线路不对称、线路频率传输特性、线路长度等对行波传播造成的影响进行了大量的数值计算和仿真分析。研究表明：依然可以使用解耦变换对不对称线路进行近似解耦，解耦后零模行波出现一定的衰减和色散，但是在短线路下，零模行波的衰减主要集中在高频带，在工频电流的影响下，零模行波的分辨率明显高于线模行波。该研究突出了行波传播特性在配电网的表现形式，可为完善配电线路行波故障检测技术提供理论依据。“,” To give a more accurate description of traveling wave, this paper carried out in-depth research on the propagation of traveling waves in overhead lines of distribution power systems, with considering the unbalanced three-phase line, line frequency transmission characteristics and line length. The research shows that the method used for decoupling balanced lines is also suitable for unbalanced lines. The zero-modal traveling wave presents obvious attenuation and dispersion. However, in a relative short distribution line, the attenuation of zero-modal traveling wave is mainly in the high frequency bands. The resolution of zero-modal traveling wave is obviously higher than line-modal traveling wave with considering the power frequency current. This research focuses on the unique features of distribution power systems, and is significant for the future study of traveling-wave based fault detection methods in distribution power systems.