There have been a million or more power quality instruments sold by dozens of manufacturers since they were introduced in the 1970s. However, a typical instrument that can measure and capture the array of PQ phenomena defined...

When I first became involved with the IEEE working groups on power-quality standards in 1994, IEEE had just published 519 1992, Recommended Practice and Requirements for Harmonic Control in Electric Power Systems. (The next...

Engineers in a large electric utility’s power quality (PQ) department had installed PQ monitoring to determine the source of a system component’s failures. They needed to see the voltage and current waveforms before, during...