躲过短路反馈电流的异步电动机电流保护改进  

To avoid short-circuit feedback current for improving current protection of asynchronous electrical motor

作　　者：龙冠湘 刘百鸣 

机构地区：[1]大唐华银金竹山火力发电分公司,湖南冷水江417505

出　　处：《电力系统保护与控制》2009年第24期207-208,212,共3页Power System Protection and Control

摘　　要：高压厂用母线本身或电动机回路近母线点发生三相短路时,非故障电动机向短路点的反馈电流可能导致其自身电流保护动作;从实例验证并分析该情况,并探讨通过设置功率方向判别的高、低值电流保护,增加保护出口延时两种方案解决此问题。Three-phase short-circuit occurred to the loop of motor near-to bus or bus itself, the non-fault motors＇ feedback current to the short-circuit point may cause their own instantaneous overcurrent protection operate. This paper analyzes this situation from an example and solves the problem by two ways.The first way is to arrange a directional power relay of high or low current protection and the second way is to arrange a time-delay relay.

关 键 词：短路反馈电流 电动机 保护改进 

分 类 号：TM772[电气工程—电力系统及自动化]