铁路信号电缆故障频域检测法

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中图分类号：TM755 文献标志码：A 文章编号：1000-582X（2026）03-025-13

A frequency-domain detection method for railway signal cable faults

JIN Ke，XU Zheng （School of Electrical Engineering， Chongqing University， Chongqing 40oo44，P.R. China）

Abstract：Fault detection of railroad signal cables is of great significance for ensuring the safe operation of railroad systems.To address the most common high-resistance fault problem in railroad signal cables，the inhomogeneous characteristics ofcable structures are analyzed by measuring the electrical parameters of multiple 1m cable segments.Based on these measurements，a normal model of inhomogeneous cable parameters is constructed，follwed by the establishment of an inhomogeneous high-resistance fault simulation model for railroad signal cables.The feasibilityof the frequency-domain reflectometry （FDR） method for locating highresistancefaults in railroad signal cables is then verified.Furthermore，adedicated hardwaresystem based on the FDRmethod is independently designed.This system transmits al 0.1MHz to 5MHz swept-frequency signal into thecableandcolects thereflected signals required forFDRanalysis throughan intermediate-frequency detector. The collected data are subsequently processed on a host computer to realize the localization of high-resistance faults with resistance values of 0.1MΩ and 0.5MΩ within a cable length of 1000m . Experimental results confirm the effectiveness and accuracy of the FDR method for detecting and locating high-resistance faults in

railroadsignalcables.

Keywords： railway signal cables; fault detection; high-resistance faults; frequency-domain reflectometry

铁路信号电缆是铁路动力控制系统专用电缆，是保障铁路系统正常运行的基石[-2]。（剩余12163字）