Application Capability of K Factor Rated Transformer

K factor of transformer is its ability to serve the nonlinear loads without temperature rise, Higher the K-factor greater the capacity to withstand harmonic heating effects.

K factor of transformer is its ability to serve the nonlinear loads without temperature rise of transformer.

Harmonic currents generated by nonlinear loads can cause overhearing and premature failure in power transformers.

Applications of K Factor Rated Transformer

K FactorTransformer Loads
K 1Loads without solid state drives like: Motors, Heaters, Incandescent lighting, Motor Generators etc.
K 4UPS with input filter, Induction heating, AC Drive,
SCR, Electric discharge light, PLC, etc
K 9DC Drives
K 13Telecom equipments, UPS without input filters. Multiwire receptacle circuits in General areas.
K 20Variable Speed Drives – VSD,
Datacenters Servers, Co-Lo Servers,
Multiwire receptacle circuits in Critical areas of Industries, Medical, Datacenters & office building.
K 30Multiwire receptacle circuits in Critical areas of Industries, Medical & Datacenters.
K 40Loads Producing very high Harmonics above 15th Level.
Applications of K Factor Rated Transformer

K factor transformers are specially designed to accommodate harmonic currents and offer protection against overheating caused by harmonics. They minimize harmonic current loss and have additional thermal capacity of known limits according to its K factor rating defined in IEEE C57-110.

Higher the K-factor, greater the capacity to withstand harmonic heating effects.

K
Factor		Linear
Load		Non Linear
Load		3rd
Harmonic		5th
Harmonic		7th
Harmonic		9th
Harmonic
K 1100 %< 10 %
K4100 %50 %16.70%10 %7.10 %5.6 %
K 9100 %100 %
K 13100 %100 %33.3 %20 %14.3 %11.1 %
K 20100 %125%42 %25 %17.9 %13.9 %
K 30100 %150 %50 %30 %21.4 %16.7 %
K 40100 %
K 50
K Factor Rating of Transformer
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