高速铁路全电缆贯通线精确故障定位关键技术分析

高速铁路电力贯通线路采用全电缆线路,发生故障后会严重影响铁路运输的安全性和可靠性。对故障的准确定位将会大大减小查找电缆故障点范围和电缆故障修复的工作量,缩短检修时间,从而提高速铁路电力供电的可靠性。本文介绍了国内外电力线路故障定位的现状,分析了各种行波测距原理及全电缆贯通线路行波传输与衰减特性,对传统行波测距技术在全电缆贯通线故障定位的适应性进行分析,提出采用分布式行波测距方法可使故障行波传输距离大幅降低,可有效减少行波传输过程中衰减和畸变的影响,对于不同类型故障行波、不同故障过渡电阻、故障点位于不同位置情况下,均能实现精确定位。实际应用案例表明,该技术定位精度较高,满足精确定位要求。

Analysis of key techniques for accurate fault location of high-speed railway full cable through line

High speed railway power transmission lines are all cable lines.If a fault occurs,the safety and reliability of railway transportation will be seriously threatened.Accurate fault location will greatly reduce the workload of fault finding and repair,shorten the maintenance time,and improve the reliability of high-speed railway power supply.This paper first introduced the current situation of fault location of power lines at home and abroad,then studied the principles of traveling wave ranging and the transmission and attenuation characteristics of traveling wave of all cable through lines,and analyzed the adaptability of traditional traveling wave ranging technology in fault location of all cable through lines.A distributed traveling wave ranging method was proposed,which can greatly reduce the transmission distance of fault traveling wave and effectively reduce the influence of attenuation and distortion in the process of traveling wave transmission.The research results show that the accurate location can be achieved for different types of fault traveling wave,different fault transition resistance and fault point in different positions.The practical application shows that the positioning accuracy is high and meets the requirements of precise positioning.