Analysis of the performance of induction watthour meters in the presence of harmonics (a new model approach)

A quasilinear model is developed to investigate the registration error of an induction watthour meter in the presence of harmonics. The registration error is determined by all the frequency responses of the harmonic components, the distortion factors of voltage and current harmonics, and the harmonic power factors; their relationship is clearly expressed in a simple error function by using the model, which provides a firm analytical basis to describe all the phenomena of the frequency response and harmonics response of the meter. All the meter parameters in the model are measurable; the measurement principles and procedures are also described in this paper. The presented model is more general, simple and parameter measurable than those of past studies. Its capability and accuracy have been verified by comparing experimental and computation results for typical single-phase and three-phase induction watthour meters.