中文摘要：

为了提高混合线路接地故障定位精度,提出了一种新的基于小波-波速归一化的行波定位算法。算法采用D型行波注入,从相电压和相电流中采集故障行波信号,进而经过相模解耦、小波变换得到行波波头,标定波头时刻;为了解决混合线路对测距的影响,对不同线路波速进行了归一化波速处理;最后,根据标定时刻完成故障测距和定位。分析了接地电阻大小、故障距离、初始相位以及采样频率对定位精度的影响。试验结果表明,所提方法能有效提高定位精度。

英文摘要：

In order to improve the accuracy of the mixing line ground fault location,this paper proposed a new traveling wave location algorithm based on wavelet-velocity normalized. The algorithm uses the D-line wave injection,fault traveling wave signal acquisition from the phase voltages and phase currents,and then after Sagami decoupling,wavelet transform gets the traveling wave,the wave head calibration time. In order to address the impact of mixing line to distance ranging,the different line velocities were normalized for velocity treatment. Finally,according to the calibration time,the fault location and positioning were completed. The impacts of the grounding resistor size,the distance of failures,the initial phase as well as the sampling frequency on the positioning accuracy were analyzed. The experimental results show that the proposed method can effectively improve the positioning accuracy.