异步法在T型线路电流差动保护中的应用  

Application of Asynchronous Method of Current Differential Protection in T-type Transmission Lines

作　　者：金恩淑[1] 杨健[1] 张有才[1] 赵越 李全杰 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]华能长春第四热电厂,长春130216

出　　处：《东北电力大学学报》2014年第1期31-34,共4页Journal of Northeast Electric Power University

摘　　要：针对现有的T型线路故障分量电流差动保护,存在外部故障电流互感器饱和误动的问题,基于异步法原理,利用其在内部故障时差动电流幅值的上升与制动电流幅值的上升基本同步,而外部故障时差动电流幅值的上升明显滞后于制动电流幅值的上升的特征,正确判别出内部故障和外部故障。大量仿真表明,该方法既能在内部故障时正确动作,也能在外部故障CT饱和时可靠不动作。Aiming at the existing fault component current differential protection of T-type transmission lines,for it exists problem of mal-operation of external fault with current transformer saturation,based on asynchronous method,using the differential currents and restraint currents reaches their threshold value amount of time differ-ent relationship when in internal fault and external fault,to distinguish internal fault and external fault. Lots of simulation show that the method will correct action in internal fault action,also reliable action in external fault with CT saturation mal-operation.

关 键 词：T型线路 异步法 互感器饱和 

分 类 号：TM76[电气工程—电力系统及自动化]