分布式行波测距在自闭贯通线路故障诊断中的应用

Application of Distributed Travelling Wave Fault Location in Diagnosis of Automatic Blocking Through Line

铁路10 kV自闭贯通线路供电距离长,运行环境恶劣多变,故障频发且难以及时排查。为解决该难题,本文分析了分布式行波技术信号提取、故障诊断流程,并通过试验和故障案例进行了验证。基于罗氏线圈原理提取电流,基于耦合电容分压法提取线路电压,实现了线路工频电压、电流以及行波电压、电流的全面综合监测,为故障诊断提供了丰富的特征参量。实际应用案例表明,分布式行波测距技术诊断结果可靠,可实现准确的故障区间判别及精确的故障定位,可有效应用于自闭贯通线路故障诊断。

The railway 10 kV automatic blocking through line has characteristics of longer power supply distance, worse and variable operating environment, frequent occurrence of faults and difficult in trouble-shooting. In order to solve the problems, the paper analyzes the extraction of the distributed travelling wave technical signal and the fault diagnosis flow, illustrates the verification on the basis of the tests and cases of the faults. The extraction of current by Rogowski coil principle, extraction of line voltage by coupled capacitance voltage dividing method realize the comprehensive monitoring of the power frequency voltage, current and travelling wave voltage and current of the line, provides large amount of characteristics parameters for fault diagnosis. Actual application cases show that the travelling wave fault location technology has reliable diagnosis, is able to realize accurate judgement of fault section and accurate fault location and is able to apply effectively for fault location on automatic blocking through line.