中文摘要：

介绍了客运专线配电系统的电气结构和特点，通过理论推导和仿真建模相结合的方法分析了客运专线配电线路发生单相接地故障后故障分量的暂态过程和频谱分布，划定了暂态分量的特征频带，分析了线路中电缆比例、过渡电阻、故障初相角和负荷数目对该特征频带的影响。仿真结果表明：将线路发生单相接地故障后故障分量的特征频带划定在200～3000Hz是合理的：线路中电缆的比例、过渡电阻和故障初相角的大小对特征频带将产生较大影响，而故障距离和负荷对特征频带的影响较小。

英文摘要：

The electrical structure and features of distribution system for railway passenger dedicated line are presented. By means of combining theoretical derivation with simulation modeling, the transient process and frequency spectrum distribution of fault component are analyzed after the single-phase grounding fault occurred in distribution line for passenger dedicated line, the feature band of transient component is delimited and the influences of the proportion of cable length in whole line length, transition resistance, initial phase-angle of the fault and load number on feature band are researched. Simulation results show that it is reasonable to delimit the characteristic frequency band of fault component within the range from 200Hz to 3000Hz after the single-phase grounding fault occurred; the proportion of cable length to whole line length, transition resistance and initial phase-angle of the fault influence the characteristic frequency band obviously, while the influences of fault distance and load on characteristic frequency band is not so evident.