基于二维小波分析的配电网单相接地故障选线新方法

将二维小波分析应用于配电网单相接地故障选线中,通过构造零序电流的解析信号,实现了对故障暂态信号幅值与相位相结合的分析,提出了一种接地选线的新方法。相对于单纯考虑幅值或相位的方法,这种结合分析能够更充分地提取丰富的故障暂态量特征信息,从而更加准确有效地实现故障选线。

A New Method for Single-phase Earth Fault Line Selection Based on Two-dimensional Wavelet Analysis in Distribution Network

Two-dimensional wavelet analysis is applied to detect the fault line when single-phase ground fault happen in distribution network.By structuring analytic signals of zero-sequence current,the analysis of combining amplitude and phase of fault transient signals is realized.A new method is put forward.Compared with the use of single amplitude or single phase,applying combined signal can obtain more details of transient signal.The fault line can be selected out exactly and effectively.