Harmonics: the effects on power quality and transformers

The use of nonlinear devices such as rectifiers or power converters, power supplies, and other devices utilizing solid-state switching has increased in industry during recent years. Unfortunately, the effect of harmonic distortion has also increased on the industrial power system as a direct result. This work is based upon harmonic studies on 480 V, three-phase, variable-speed drives and the effects of harmonics on transformers in those systems. It also includes recommendations for correction of the problems resulting from harmonic distortion.