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电网技术  2006 

基于小波分析的电缆-架空线混合输电线路行波故障测距方法

, PP. 92-97

Keywords: 电力电缆,架空线,故障测距,小波分析,电力系统

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Abstract:

根据电缆–架空线混合输电线路上行波信号在连接点处发生突变的特点,提出了一种基于小波分析的电缆–架空线混合输电线路行波故障测距方法。向待测混合线路的电缆端注入脉冲电流,利用小波分析对注入的采样信号进行多分辨分析,得到模极大值点的位置。利用非故障相信号反射点的位置判别混合线路的连接点位置,再利用故障相与非故障相的差信号判别故障点,从而调用不同的算法实现混合线路的故障测距。采用ATP/Matlab的仿真结果表明,该方法可对混合线路上任意点的短路故障进行测距,也可对断线故障进行精确的测距。基于小波分析的方法可准确识别反射脉冲,减小电缆线路分支和近区故障反射波对测量精度的影响,测距精度高。

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