配电网小电流单相接地故障选线方法研究

Research on Selection Method for Small Current Single Phase to Ground Fault Line in Distribution Network

针对配电网小电流单相接地故障率越来越高,提出一种新的配电网小电流单相接地故障选线方法。将双树复小波变换用于配电网小电流接地故障选线,并结合能量相对熵作为故障选线的依据。通过双树复小波变换来处理小电流信号,利用能量相对熵确定故障线路。并通过仿真对该方法的正确性和有效性进行验证。结果表明,该方法可以快速确定故障线路。这种方法为我国配电网故障选线方法的发展提供了参考和借鉴。

In view of the increasing fault rate of small current single-phase grounding in distribution network,this paper proposes a new line selection method for small current single-phase ground fault in distribution network.The dual tree complex wavelet transform is applied to the fault line selection of small current grounding in distribution network,and the energy relative entropy is used as the basis for fault line selection.The small current signal is processed by the dual tree complex wavelet transform,and the fault line is determined by the energy relative entropy.The correctness and effectiveness of the method are verified by simulation.The results show that the method can quickly determine the fault line.The research provides a reference for the development of fault line selection method in distribution network in China.