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.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2009年第24期207-208,212,共3页
Power System Protection and Control
关键词
短路反馈电流
电动机
保护改进
short-circuit feedback current
electrical motor
protection improving
