Y.X. Xu,∗ H.Z. Cheng,∗ and A. Domijan∗∗
Harmonic analysis, watthour meters, least squares methods, error analysis
An analysis of a series of experiments using the least squares method (LSM) showed that the registration error of an induction watthour meter in the presence of harmonics contained contributions from three aspects: the amplitudes obtained from the LSM analysis of frequency response test data which meant the max registration when the frequency and RMS of voltages and currents were not varied, only their phase angle varied, they decreased with the harmonic order increasing; the phase shifts of voltage and current circuits which obtained from the LSM analysis of frequency response test data too; and variances in the reported fundamental energy affected by the harmonics. These harmonic experiments involved a frequency response test, a harmonic power test, a harmonic current test and a harmonic voltage test. The analysis also showed that the amplitudes and phase shifts remained constant, and their DC offsets were negligible, when the current amplitudes and phases varied.
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