Electric energy metering device is constituted of Watt-hour meter, electric current and voltage transformer and secondary circuit. The composite error of electric energy metering comes from error of electric energy meter (r0), combination of transformer (εP), the voltage decrease from secondary circuit of voltage transformer (rd). As a result, the composite error of electric energy metering device is:r=r0+εP+rd (%).%电能计量装置由电能表、电流电压互感器及其二次回路构成。电能计量装置的综合误差包括：电能表的误差r0、互感器的合成误差着P、电压互感器二次回路电压降引起的合成误差rd。因此，电能计量装置的综合误差为：r=r0+着P+rd（豫）。
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