Author： Gyselinck J Melkebeek J
Publisher： Emerald Group Publishing Ltd
ISSN： 0332-1649
Source： COMPEL: Int J for Computation and Maths. in Electrical and Electronic Eng., Vol.20, Iss.1, 2001-01, pp. : 253-268
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Abstract
The influence of overlap joints in transformer cores on the local flux and eddy current distribution and on overall transformer characteristics is studied by means of two-dimensional finite element (2D FE) models. A simplified 2D FE model of a single overlap joint is used for estimating the resulting increased magnetomotive force and increased eddy current losses. Both effects can be accounted for in a 2D FE model of the complete transformer by locally adopting modified material characteristics (viz. BH-curve and electrical conductivity) in the cross-section of the core. This novel method is demonstrated and validated by applying it to a three phase transformer. The calculated no-load currents and losses are compared to the measured ones.
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