Harmonics: how they affect the development and design of "K" factor transformers

The author describes how dry-type and liquid-filled power transformers can be designed to give many years of satisfactory operation even when exposed to the ever increasing nonlinear load environment. They can have all of the desirable features, like copper or aluminum windings, lower than normal full load temperature rises and indoor or outdoor enclosures. As more installations are completed and harmonic measurements taken, power engineers will be in a better position to specify appropriate K factor transformers for nonlinear load applications.