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.

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。

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The negative sequence distance relay gets free from the winding connection of the transformer. So it is the best choice to use the kind of the distance relays for the transformer backup protection.

负序距离继电器的行为与变压器绕组的接线无关，所以它是作为变压器后备保护的距离继电器的最佳选择。

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In order to solve the problem of relay protection failure for induction motor, we put forward the method of stator winding small fault detecting based on wavelet transform.

对电动机的继电保护中存在电动机微变故障保护失效的问题，提出了基于小波分析的定子绕组微变故障检测方法。

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