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Does SquareD/Schneider Electric offer K20 rated Transformers?

Issue:
K20 Rated Transformers

Product Line:
LV Transformers

Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric

Cause:
Extreme Harmonic content in certain applications

Resolution:

While SquareD/Schneider Electric did at one time offer Transformers with a K20 rating, it often proved to be not recommended nor necessary.  ANSI C57.110 is the only recognized industry standard for evaluating the effect of non-linear loads on Transformers.  Following that standard, a Transformer with a nominal impedance between 3 and 5%, the target design impedance for SquareD/Schneider Electric K-rated transformers, will not experience a K-factor load beyond K-9 due to harmonic diversity and the attenuation effect of the Transformers reactance.  SquareD/Schneider Electric now offers K-9 rated Transformers.  In the past, the industry had largely settled on K-4 and K-13 as the common offering.  Requesting a K-rating higher than 13 causes the transformer to have a lower impedance.  A lower impedance allows a higher crest factor in the load, thus allowing higher harmonics to exist on the load side of the Transformer -- a distinctly undesireable effect.


CTA-ID : 2000958
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