交流互感器作为特殊变压器的一种早已广泛应用于交流测量系统中,藉以进行量程的扩展和转换。高中物理课本对此作了粗略介绍。交流互感器以被测交流电压或交流电流作为变压器初级,经互感在次级上获得新的交流源,由被测交流源的变化控制次级交流源,通过次级交流源的有关数据反映出被测交流源的有关量,因而它是受控源,是一种有源器件。高中物理课本还通过直流电流表的改装 As a special type of transformer, AC transformers have been widely used in AC measurement systems to expand and convert ranges. High school physics textbooks gave a rough introduction to this. The AC transformer uses the measured AC voltage or AC current as the primary of the transformer, obtains a new AC source on the secondary through mutual inductance, controls the secondary AC source from the change of the measured AC source, and reflects the relevant data of the secondary AC source. The relevant amount of the AC source being measured, and thus it is a controlled source, is an active device. High school physics textbooks also modified by DC ammeter