基于小波分析的电力电缆行波故障测距

提出了基于小波分析的电力电缆行波故障测距方法。该方法向待测电力电缆注入脉冲电流,利用小波分析对采样信号进行多分辨分析,得到模极大值点的位置,也就是采样信号突变点的位置,该突变点的位置反映了故障点的位置,从而实现电力电缆的故障测距。ATP/Matlab下的仿真计算结果表明,较之于传统的行波测量方法,该方法可以准确识别反射脉冲,降低电缆线路分支和近区故障反射波对测量精度的影响,测距精度不受故障类型的影响,测距误差小于一个采样距离。

Research of electrical cable travelling wave fault location based on wavelet analysis

A new electrical cable travelling wave fault location based on wavelet analysis is proposed. This method injects impulsecurrent source into electrical cable. It detects sampled signal's mode maximum point by multi-resolution analysis based on wavelet anal-ysis. Because this point is sampled signal's discontinuity point on the cable line, fault location is realized. Compared with traditionalfault location method based on ATP/Matlab simulation, this method can precisely identify reflection impulse, reduce the mistake influ-ence of multi-branch cable transmission line and close fault reflecting wave. The result is not affected by fault types and the error offault location can be maintained in the range of one sampling distance.