描述
电表的接线形式只有两种回路：电压回路和电流回路。电表接线的一般原则是：电流线圈与负载串联，或接在电流互感器的二次侧，电压线圈与负载并联或接在电压互感器的二次侧。三相四线有功电表由三个驱动部件组成，称三元件电表，和单相及三相三线电表外观上最大的不同是其共有11个这么多接线端，此电表常用在动力和照明混合的供电电路
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