1. Distribution Transformer Winding Losses Due to Nonsinusoidal Currents
- Author
-
W.M. Grady, M. S. Hwang, and H. W. Sanders
- Subjects
Engineering ,business.industry ,Energy Engineering and Power Technology ,Mechanics ,Distribution transformer ,Copper loss ,law.invention ,Harmonic analysis ,Electric power system ,Superposition principle ,law ,Electromagnetic coil ,Control theory ,Eddy current ,Harmonic ,Electrical and Electronic Engineering ,business - Abstract
Increased transformer winding losses are an important consideration in determining the overall impact of harmonic currents in a power system. Frequently, losses due to harmonic currents are assumed to vary with the square of frequency. The purpose of this paper is to compare winding loss calculations from a finite element method with measured losses in single phase distribution transformers and to test the principle of superposition of harmonic losses due to nonsinusoidal currents. The results confirm both the finite element method and the principle of superposition. Furthermore, it is shown that, due primarily to inaccuracy in measuring 60 Hz eddy current losses, application of the commonly accepted frequency squared rule can yield overly pessimistic loss predictions for typical power system harmonic frequencies.
- Published
- 1987