Abstract
Transient analysis of transformers requires an accurate estimate of the resistive loss of conductors of the windings in a wide range of frequency. Being close to each other, the conductors affect the current distribution of each other significantly. In this paper, a thorough study of calculating the resistive loss of conductors in the frequency domain is performed using the quasistatic electromagnetic analysis and finite element method (FEM). Skin and proximity effects of single and multiple circular and rectangular solid conductors are investigated. Current density distribution at the cross-section of conductors and ac resistance of conductors are calculated. This modeling is suitable for calculating the per-unit-length (PUL) parameters of conductors, which are required for white-box modeling of power transformers using multiconductor transmission lines (MTL) theory. This work would help to accurately model the transient damping of a power transformer winding in the MTL-based white-box model.
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