10kV配电线路单相接地故障暂态电流行波选线研究

Study on Line Selection of 10kV Distributed Line Single-phase Earth Fault with Transient Current Traveling Wave

研究了基于暂态电流行波理论在10kV配电线路单相接地故障选线中的应用。介绍了B样条小波变换理论、行波的产生,以及电流行波模量分析。通过B样条函数小波变换提取故障时配电线路各支路出线的初始电流行波模量信号的故障特征,构成新的故障选线选相判据。利用Matlab建立了一个10kV配电系统模型,从动态仿真模型中采集大量针对不同故障模式的测试样本,仿真实验结果表明该方法能够准确、可靠的实现选线。

This paper studied on the application of transient current wave theory in line selection of single-phase grounded fault of lOkV distributed system. It introduced theories of B-spline wavelet, the formation of traveling wave, and the analysis of the mode components of current traveling waves. Fault characters were pick-up from the mode components of initial current traveling waves in branch outlets as a new principle of fault line and fault phase selection by B-spline wavelet transform. The paper simulated a 10kV distribution grid, which was trained by a great deal of samples collected from dynamic simulation model and tested aiming at different fault models. The results of simulation experiment prove that the above methods could select the fault line accurately and reliably.