摘要
外部发生短路故障时 ,由于电流互感器饱和引起的暂态不平衡电流造成的差动保护误动作 ,是一个值得仔细研究的重要课题。文中提出了一种应用小波变换原理提取和分析故障发生时刻及电流互感器饱和后故障相电流波形与差流波形的暂态特性 ,有效地防止因电流互感器饱和造成的差动保护误动作的新方法。
Differential protection is easy to be influenced by the im balance current caused by current transformer saturation to mal- operate. A m ethod for analyzing the differential currentand the phase current of the transformer by wavelettransform is presented to detect accurately fault point happening and differential current appearing.The instantaneous current value after the saturation of current transform er is also analyzed to avoid the differential protection to mal- operate when the fault from external fault zone to internal fault zone.
出处
《电力系统自动化》
EI
CSCD
北大核心
2002年第2期45-48,共4页
Automation of Electric Power Systems
