Electricity consumption metering with transformer phase angle error compensation

摘要

A method or means of metering electricity consumption comprises taking power measurements and compensating said measurements for a phase angle error introduced by transformer means 6 involved in the measuring process. The transformer means 6 may be a current and/or voltage transformer with a predetermined phase angle error characteristic. The meter may use current and voltage measurements i. v to determine real and reactive power values PR(meas), PX(meas) which may be compensated, using compensating means 20 to 28, to provide true real and reactive power values PR, PX. When more than one transformer is involved: respective, average or the difference between phase angle errors may be employed.