摘要
介绍了异步电动机反馈电流及决定反馈电流的因素,经过实例分析表明,通过计算短路时不同容量电动机对系统提供反馈电流的大小以及该电流所占短路电流总值的比重,得出小容量电动机其对短路点提供的反馈电流相对于短路点总电流过小,可以忽略不计。但随着高压大用户电动机容量的不断增大,电动机对短路点提供的反馈电流所占比重也越来越大,应增强大容量异步电动机对系统短路故障影响的意识。
Introduction was made to asynchronous motor feedback current and factors determining feedback current. Actual example analysis shows that when short circuit took place, according to the volume of feedback current to the system provided by different ca- pacity motors and the current in the proportion of total short-circuit current value, the feedback current from small capacity motors to their short-circuit points was too small to calculate, relatively compared with total current of short-circuit points. With the high-voltage big user’s motor capacity increasing, the feedback portion current provided by motor to short-circuit points is getting larger and larger, so the attention should be paid to the impacts of large capacity motor on short-circuit system faults.
出处
《电工电气》
2010年第11期49-51,共3页
Electrotechnics Electric
关键词
系统故障
异步电动机
反馈电流
三相短路
system fault
asynchronous motor
feedback current
three-phase short circuit
