电压互感器对牵引网行波故障测距法的影响分析

摘要

牵引网行波故障测距技术通常采用牵引系统中已有的电压互感器设备获取电压暂态行波信号.为了研究电压互感器的传变特性对牵引网行波故障测距方法的影响,本文采用ATP-EMTP建立电压互感器仿真模型,并将其植入牵引网仿真线路中进行仿真研究.仿真实验综合考虑牵引供电方式、短路故障类型、电力机车以及故障发生位置等主要影响因素,运用bior4.4小波变换对互感器一次侧和二次侧的电压行波信号进行分析.研究结果表明,在不同的牵引线路情况和故障条件下,互感器均能准确无延时地传输故障行波和波头极性,说明电压互感器对故障行波的传变特性基本不会对行波故障测距法产生影响.因此可以利用线路已有的电压互感器获取故障信号进行行波测距法.%Traveling wave fault location technology for traction usually adopts voltage transformers installed in traction system to measure the voltage transient traveling wave signal.In order to study the influence of transfer characteristic of voltage transformer on traveling wave fault location algorithm for traction,the simulation model of voltage transformer is established by adopting ATP-EMTP in this paper and applied to traction lines for simulation experiment.Considering the main influencing factors such as traction power supply mode,type of short circuit fault,electric locomotive and fault location,etc.,the voltage traveling wave signal of primary side and secondary side of voltage transformer are analyzed by bior 4.4 wavelet transform.It is found that in two kinds of situations,voltage transformer can transform accurately the head part of traveling wave and the polarity of head part without time delay.Simulation results show that transfer characteristic of voltage transformer for traveling wave signal has no influence on traveling wave fault location algorithm.So Traveling wave fault location technology for traction can adopt voltage transformers installed in traction system.