What is difference between Type NL (K-4 rated) or NLP (K-13 rated) Transformers compared to standard Low Voltage Distribution Transformers?
Issue:
K Rating on Low Voltage Transformers
Product Line:
LV Transformers
Environment:
Product sold in North America
Cause:
Harmonic Energy generation in Electrical Systems
Resolution:
SquareD/Schneider Electric`s line of K-rated transformers are designed to minimize the eddy current, or stray losses within the Transformer. It is these eddy/stray losses that are affected by non-linear loads such as computers, fax machines, and other office electronic equipment. A k13 rated transformer will accommodate a higher level of harmonics without exceeding its temperature rating than a k4 rated unit of the same kVA, voltage and temperature class.
K rated Delta Wye units will operate at full load in circuits rich in harmonics without exceeding the temperature rating of their insulation systems. Once the loading goes above 80% of transformer capacity and a high level of harmonics are present, k4 units should be considered to prevent overheating. At loading levels above 90% a k13 unit should be used. The recommendation to use k Factor Transformers for computer loads assumes high harmonics and high loading levels.
K Rating on Low Voltage Transformers
Product Line:
LV Transformers
Environment:
Product sold in North America
Cause:
Harmonic Energy generation in Electrical Systems
Resolution:
SquareD/Schneider Electric`s line of K-rated transformers are designed to minimize the eddy current, or stray losses within the Transformer. It is these eddy/stray losses that are affected by non-linear loads such as computers, fax machines, and other office electronic equipment. A k13 rated transformer will accommodate a higher level of harmonics without exceeding its temperature rating than a k4 rated unit of the same kVA, voltage and temperature class.
K rated Delta Wye units will operate at full load in circuits rich in harmonics without exceeding the temperature rating of their insulation systems. Once the loading goes above 80% of transformer capacity and a high level of harmonics are present, k4 units should be considered to prevent overheating. At loading levels above 90% a k13 unit should be used. The recommendation to use k Factor Transformers for computer loads assumes high harmonics and high loading levels.
Released for: Schneider Electric Canada
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