Journal
COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING
Volume 20, Issue 1, Pages 253-268Publisher
MCB UNIV PRESS LTD
DOI: 10.1108/03321640110359976
Keywords
finite element method; transformers; eddy currents; iron
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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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