基于ZnO非线性电阻接地系统故障识别方法研究

Study on Methods of Fault Identification by Using ZnO Nonlinear Resistance Grounding Mode

随着配网容量的增大,单相接地故障频发。文章对中性点经ZnO非线性电阻接地系统故障后的零序电流进行小波多尺度分析,通过计算高频分量在固定时间窗内的能量比提出识别判据。最后,结合实际系统继电保护方案及ZnO非线性电阻作用的有效性形成故障识别方法。

Developments in power capacity have made single phase grounding fault increasingly prominent.By using discrete wavelet,the multi-resolution analysis on zero sequence current is performed.According to the high frequency component energy ratio within the time window,the protection strategy based on ZnO nonlinear resistance is put forward.Finally,combined with the effectiveness of the ZnO nonlinear resistance and relay protection scheme in practical system,the ZnO nonlinear resistance grounding mode identification method is designed.