一种实用的异步电动机的电源保护装置

A Practical Power Protection Device of the Three-phase Asynchronous Motor

三相异步电动机的电源保护问题，国内外研究甚多，方法各异，本文介绍了一种新型的方法，详细地讨论了该装置闭环控制电路的原理及主要技术参数．

People all over the world are worklng on the power protection problem of the threephase asynchronous motor, finding various methods. This paper introduces one of the new ones,and elaborates the principle and the main technical parameter of its closed control circult.