What are K-Factor Transformers and where are they used?

K-factor transformers are designed to withstand the extra heating and higher neutral currents caused by harmonics created by non-linear loads such as VFD, DC power supplies and LED lighting. K-factor distribution transformers in North America are subject to minimum efficiency regulations in both the U.S.A. and Canada. K-Rated transformers must have:

  • Operate at specific K-rated harmonics without overheating
  • 200% rated neutral
  • Electrostatic Shield