Transcription of Sizing Neutrals for Transformers - lanecoburn.com
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Sizing Neutrals for Transformers - lanecoburn.com
|PURE POWER// FALL 200524K-rated Transformers are typically usedwhere anticipated loads include non-linear power supplies. They don tremove harmonic distortion from thesystem. Rather, they handle the addedcurrent and heating effects resultingfrom nonlinear loads without Laboratories has estab-lished ratings of 1, 4, 9, 13, 20, 30, 40and 50 as standard K-factor ratings. K-rated Transformers include neutral lugsthat allow for 200% neutral connec-tions; smaller parallel windings on thesecondary side of the transformer tocompensate for the skin effect associ-ated with high frequency harmonics;transposed delta winding conductors;and electrostatic shielding between theprimary and secondary windings. Harmonic load currents cause addi-tional heating, primarily in the form ofadditional winding eddy current provides methodsto de-rate a transformer for a given har-monic load profile.
frequency number squared for each of the harmonic frequencies and the sums of these values added together, they equal the K-factor number. Differing amounts of per unit
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