Comparative analysis of instruments measuring time-varying harmonics

This paper aims to evaluate the performance of commercial power quality (PQ) instruments under time-varying conditions. By using a high precision programmable voltage and current source, two meters from different manufacturers are analyzed and compared. Three-phase voltage signals are applied to PQ instruments of different classes, considering 3 situations of time-varying harmonic distortions. This work is relevant considering that Brazil is deploying standardization in terms of power quality measurements aiming towards regulatory procedures and index limits.