【摘要】 提出一种新型差动保护,在时域中对两端电流的故障分量波形进行比较,并且考虑全频域内的信号, 较少受故障期间暂态分量的影响。同电流差动保护相比,该保护可更可靠、快速动作,同时,它对信号的同步要求较低,也较容易实现与整定,能够成为超高压长距离输电线路的主保护更多还原

【Abstract】 A new differentialprotection schem e is designed, in which the currentfaultcom ponentw aves in two term inals of the protected transm ission line are com pared in tim e-dom ain, and the w hole inform ation in frequency dom ain is taken into account. Com pared with currentdifferentialprotection, the new protection has better perform ance on resisting the influence oftransientcom ponent, higher reliability and fasterspeed. The dem and for the synchronism ofthe currentis com paratively low . Itfreesfrom thesystem oscillation. Itcan be realized easily and could bethe prim ary protection ofthelong transm ission linesw ith ultra-high-voltage. This projectissupported by the Research Fund forthe DoctoralProgram ofHigherEducation (RFDP) (No.96048723).更多还原