基于小波分析的地下电缆故障定位仿真研究

摘要

In order to achieve precise positioning cable fault, the multi-layered solution wavelet theory applied to the detection of cable fault traveling wave signal, using simulation software to 25KV XLPE cables single prototype, build power cable simulation test model, using Daubenchies , Symlets, Coiflets three different mother wavelet wavelet transform to analyze the fault waveform. Simulation results show that the use of multi-layer solution wavelet transform to analyze the fault waveform, can reduce the failure time waveform discrimina⁃tion,and better identify fault waveform,making underground cable fault location more accurately,thereby reducing the restoration time.%为了能够实现电缆故障精确定位，把小波变换的多层解理论应用于检测电缆故障行波信号，借助EMPT/ATP仿真软件，以25 kV交联聚乙烯单芯电缆为原型，建立电力电缆仿真测试模型，采用Daubenchies、Symlets、Coiflets三种不同母小波函数进行小波变换来分析故障波形。仿真结果表明利用小波变换的多层解来分析故障波形，能减少故障波形判别时间，更好地辨识故障波形，使得地下电缆故障定位更加准确，从而缩小复电时间。