“电工学”课程中继电器-接触器控制的实践教学

Teaching Practice on Relay-Contactor Control in the Electrotechnician Course

本文介绍了"电工学"课程的继电器-接触器控制中存在的临界竞争现象的原因及其避免措施。在分析和设计继电器-接触器控制电路时,往往忽视临界竞争现象,结果造成电气控制达不到预期目的,甚至造成事故。本文从触点的转接过程入手,结合具体实例说明,阐述这一现象的实质,并根据不同电路给出不同的解决办法,目的是引起从事本课程教学和实践的有关人员重视。

This paper analyzes the cause of critical-competition phenomenon in relay-contactor control in the Etectrotechnician course and introduced methods to prevent it. In the practice of analyzing and designing of relay-contactor circuits, the critical-competition phenomenon is usually ignored, causing failures in reaching the intended purpose or even damages. The paper starts from the switching of contact, introduces an＇d elaborates the essence of this phenomenon with specific examples. Then it gaves solutions to varies of circuits respectively. Hopefully it can raises the attention of fellow teachers and users.