基于暂态电流谱能量的母线保护新原理

A Novel Busbar Protection Based on Transient Current Spectrum Energy

提出了一种基于故障暂态电流的母线保护新原理。利用小波变换提取母线上各回路故障暂 态电流高频分量,通过比较各暂态高频电流在一定时窗内的谱能量实现母线内、外部故障的快速、 可靠判别,从根本上避免了电流互感器饱和问题的影响;结合一个半断路器母线接线方式,给出了 相应的母线保护方案;通过ATP-EMTP对实际电网的大量仿真计算,验证了所提出原理的正确性 和有效性。

This paper proposes a novel transient current based protection technique for busbar. The proposed technique uses wavelet transform to extract the high-frequency components of fault-generated transient currents in all circuits connected to the busbar. By comparing their spectrum energies in a given time, an internal or external fault can be identified before current transformer saturation occurs. The protection scheme for busbar configuration of one and half breaker is also discussed. The EMTP simulation shows that the scheme is correct and effective.