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:
K20 rated Transformers are not offered. 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 only offers K-4 and K-13 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 undesirable effect.
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:
K20 rated Transformers are not offered. 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 only offers K-4 and K-13 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 undesirable effect.
Released for: Schneider Electric USA
