| K - Factor Transformers for Harmonic Loads |
| Catalog Pages 40 - 41 |
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Domestic distribution systems and linear loads operate at the fundamental frequency of 60 Hz. Harmonic content in distribution systems means that there are integer multipliers of the fundamental 60 Hz frequency present. For instance, the second harmonic is 120 Hz, the third harmonic is 180 Hz, the fourth harmonic is 240 Hz, etc.
Transformers operating in a distribution system containing significant harmonics will exhibit potentially serious effects of increased operating temperature. Additionally, it is common to find overloaded neutral conductors resulting from the additive effect of third harmonic and succeeding odd multiple harmonic current flow (triplen harmonics) as well as circulating currents in the primary, eddy current losses, and skin effect losses.
Harmonic content of a distribution system is indicated by a number called K-Factor.
Larger values of "K" indicate the presence of more harmonics in the load. Harmonic content of a load
may be determined by measurement utilizing a recording analyzing meter. Linear loads have a K-Factor of 1. Switch
mode power supplies have a K-Factor as high as K-20. Other nonlinear loads have a K-Factor which varies with the
device.
Dongan K-Factor transformers are specifically engineered to operate at full load and full harmonic rating without
exceeding the rated insulation system values - effectively neutralizing the dangerous effects of temperature and
circulating currents. Windings and cores are designed to operate in the presence of triplen harmonics without overheating
or forcing the core into saturation. These transformers will provide years of trouble free service to large office
buildings, industrial plants, processing equipment and any load with a designated harmonic content.
UL Recognized Insulation System File E100887.
| K - Factor Transformer Voltage Combinations | ||||||||||||
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