The Impact of Low-voltage High-power Asynchronous Electromotors on

Three-phase Short-circuit Current

Gao Manru（Teachers＇College of Beijing Union University，Beijing 100011，China）

Abstract Using Matlab software, simulation analyses of the impact of low-voltage high-power asynchronous electromotor on the feedback current at short-circuit point are performed from three aspects: short-circuit time, short-circuit point and the electromotor capacity when faced with three-phase short-circuit, and compared with the calculated values. The magnitude and variation rules of the feedback short-circuit current at short-circuit points from the electromotor are demonstrated at the time of symmetrical short-circuit.

Key words　Asynchronous electromotor　Three-phase short-circuit　Feedback current　The peak value of short-circuit current

摘　要　使用 Matlab 软件从短路时刻、短路点、电动机容量三个方面对三相短路时低压大功率异步电动机向短路点反馈电流的影响进行仿真分析，并与计算值进行比较，论证了对称短路时，电动机向短路点反馈短路电流的大小及变化规律。

关键词　异步电动机 三相短路 反馈电流 短路电流峰值