Abstract: As the pointer type three-phase power meter with one side and two side ratio, the nominal of three phase power is usually obtained by calculation. Aging voltage and aging current. In the simple case, the power value is the product of voltage and current in a specific power factor, which may lead to a large error. And even a false judgement of the calibration results. In this paper, we will give a description of the calibration method of the three phase power meter which is connected to the transformer, and theoretical analysis.

Key words: Three phase meter, Calibration method, Transformation ratio, Transformer