基于误选用380V直接接入式三相三线电能表的误差及更正系数分析

Analysis of Errors and the Adjusted Coefficient Based on Mistaken Using 380V Three-phase-three-wire Watt-hour Meter

380V三相四线系统存在用三相三线电能表的情况,由于误选型导致计量附加误差。文章主要从理论公式推导,结合电压电流相量图,分析包括各种单相负荷、两相负荷、三相负荷情况的误差,从误差数值得出相应的各种工况的电能计量更正系数。

In some cases, there are three-phase-three-wire energy meter in 380V three-phase four-wire system. It leads to additional measurement errors due to mistaken selection. All errors from single-phase load, two-phase loads and three-phase loads are analyzed by the theory formula combined with voltage and current phase diagram. The adjusted co- efficient of energy measurement corresponding to a variety of operating conditions are obtained from error values.