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.
由继电器实施对电动机、进水阀、排水阀的控制。
Implements by the relay to the electric motor, the inlet valve, draw-off valve's control.
为改善地面操作起重机的起动、点动运行性能，可选用绕线型电动机加外延时继电器控制。
Slip-ring motor can be used in conjunction with time delay relays for floor operated cranes to improve their travelling quality during start and inching.
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