How does the presence of harmonics, such as in high-density office computer and network load currents, affect energy efficiency?
Harmonics do lessen the efficiency of all transformers. Harmonics cause somewhat higher losses in transformer windings (as much as 30 percent for most Square D Transformers). Type EE transformers are no more susceptible than any other transformer to the effect of harmonics. Type EE transformers provide the same percentage of loss reduction compared with General Purpose Transformers, or even K-Factor rated transformers under the same load conditions. Because the average loading of low voltage transformers is normally only 35%, a K-factor rating is not necessary for Type EE transformers.
