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电流减小或断电报警器是根据电流在导体中通过时,电流互感器上就产生感应电动势的原理制成的。报警器适用于工厂、中小试验室,科研单位等使用的干燥箱.蒸养釜、回火炉等,以及车间机器启动.照明灯亮、机停灯熄等的自动控制或报警装置。由于报警器结构简单,元器件少,适宜自己装置,可以应用到不同场合。电路图见图。1.工作原理当导线中有一固定交流电流通过时,电流互感器LH上就产生感应
The current reduction or power-off alarm is based on the principle that an induced electromotive force is generated on the current transformer when the current passes through the conductor. The alarm is applicable to the drying ovens used in factories, small and medium-sized laboratories, scientific research institutes, etc., steaming kettles, tempering furnaces, etc., as well as automatic control or alarm devices that are started by the workshop machine, lighting, and stop lights. Due to the simple structure of the alarm and fewer components, it is suitable for its own device and can be applied to different occasions. The circuit diagram is shown in the figure. 1. Working principle When there is a fixed alternating current in the wire, the current transformer LH will generate