Prediction of Stray Losses in Power Transformer

Leakage flux and stray losses of three-phase power transformer are analyzed using 3D-FEM. The eddy current losses in the clamp plates and transformer tank are obtained by modeling them as skin depth independent shell element. The calculation is made under magnetodynamic steady state load condition treating the magnetic core magnetizing characteristic as non-linear. The results are obtained by varaying clamp plates and tank permeabilities. Influence of diferent transformer core material on the losses value is also investigated.