Testing the performance of three-phase induction watthour meters using reproduced harmonically distorted actual recorded waveforms

The authors discuss a computer-based testing of a three-phase induction watthour meter in the presence of harmonic distortion. Two three-phase harmonic generators produce the distorted current and voltage waveforms. Each waveform consists of prespecified harmonic magnitude and phase, allowing balanced or unbalanced conditions to be simulated in the testing. A fiber-optic sensor converts the rotation of the disk of the meter into digital signals which are stored in an IBM PC/AT. A data acquisition system transfers the samples of current and voltage waveforms to compute the power and energy for comparison. The authors describe: the computer-based harmonic generator facilities used for testing, the testing procedure, the impact of the magnitudes and phase angles of the different harmonics on the meter's registration error, and the registration error due to actual reproduced harmonically distorted data.<<ETX>>