矿井配电网输电线路故障测距方法的研究

针对矿井配电网处于供电网的末端，又是单端供电，中性点不接地或通过消弧线圈接地的特点，提出了使用单端电流行波法实现矿井供电线路单相故障点定位的方法．通过对矿井供电网故障行波的特征进行的深入分析和选择合适的小波函数，将小波分量的模极大值出现时间确定为电流行波脉冲的到达时刻，根据不同尺度下小波变换的模极大值的大小及极性可以识别被检测信号的性质，实现故障点的准确定位．大量实验数据和仿真结果表明了该小波分析的有效性并得出了小波神经网络可以提高测距法测距精度和可靠性的结论．

Study of Fault Location of Transmission Lines in the Mine Distribution Network

The mine distribution network is located at the end side of power distribution network and is one-terminal power network.Aiming at the speciality inentioned above,a method of using one-terminal current data traveling wave to locate the fault position in transmissionlines was presented.The characteristicsof fault one-terminal current traveling wave in mine distribution network were analyzedin detail.The results show that the exact location of the fault point can be detected by choosing suitable wavelet function.The occurring time of maximum mode value of the wavelet canbe considered as the arriving time of the current traveling pulse.According to the value of the maximum mode and the polarity in different preciseof the wavelet,the characteristicof the detected signal can be decided.The experimentsand simulations indicate that wavelet transform can realize fault location correctly,and wavelet nearal network(WNN) modules can be used to raise the location precisionand dependability.