本文通过对高铁电缆护层故障测距、定点方法的分析,以及对工作实践中的经验总结,介绍了利用电阻法和跨步电压法查找高压电缆护层故障的作法。对快速、准确地分析高铁电力电缆故障和提高高铁供电可靠性将有重要的参考意义。 In this paper, by means of fault distance measurement and pointing method analysis of high-speed railway sheathing and the summary of experience in working practice, this paper introduces how to find the fault of high-voltage cable sheathing by means of resistance method and step voltage method. It has important reference meaning to analyze the fault of high-speed rail power cable quickly and accurately and improve the reliability of high-speed rail power supply.