How have some engineers dealt with harmonics in their system designs?
To improve system performance and provide the best possible environment for nonlinear loads, a designers options have been limited to over-sizing distribution transformers and shared neutral conductors. As an alternative, branch circuits have been configured with a separate neutral conductor for each phase conductor. In either case, branch circuits have been underutilized and limited in their length as a means of reducing voltage distortion and neutral-ground voltage (common mode noise) at the loads. As an alternative to over-sizing conventional distribution transformers, many designers have specified K-Rated transformers. Unfortunately, a K-Rated transformers higher harmonic impedances cause an increase in voltage distortion.
