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电力系统发生故障时,由于线路电感的存在,故障暂态信号中将含有大量的衰减直流分量,该直流分量刚好可以用于故障选相。选用京津唐500 kV输电线路的实际参数,建立EMTP/ATP系统仿真模型,产生故障数据,利用MATLAB编程,运用EMD提取直流分量,实现基于衰减直流分量的输电线路故障选相。理论分析和仿真验证表明,所提故障选相方法简单可靠,且不易受故障类型、故障时刻、过渡电阻、故障位置等因素的影响。“,”In the case of power system failure,due to the presence of line inductance,fault transient signals contain large quantities of decaying DC component,just available for fault phase selection.This paper,using the actual parameters of 500kV Jing-Jin-Tang transmission line,establishes the EMTP/ATP simulation model to derive fault data.Then program by means of MATLAB;adopt EMD to extract the DC component;thus realize transmission line fault phase selection based on decaying DC component.Theoretical analysis and simulation test show that this proposed fault phase selection method is simple and reliable,unsusceptible to fault type,fault time,transition resistance,fault location and other factors.