Corrected winding eddy-current harmonic loss factor for transformers subject to nonsinusoidal load currents

摘要

The assumption that the transformer windings eddy loss rise in proportion to the square of the harmonic order is reasonable for small conductors and low harmonics with errors on the conservative side only for a combination of large conductors and higher harmonics. This paper presents a corrected harmonic loss factor by taking into account the depth of penetration, which leads to more accurate estimation of the increased transformer winding losses under non-sinusoidal load currents.