本文提出电流继电器控制绕线式异步电动机起动电路改进方法，并对改进电路优劣进行了分析。
A method in the improvement of current relay controls winding asynchronous motor starting circuit is put forward, and the merit, demerit of it are described in the paper.
介绍了7ut5 12型数字式差动保护继电器的功能、特点及在电动机差动保护中的应用。
Introduce function, Character of 7ut512 digital differential relay and applying it to differential protect on motor generator.
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