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1 Journal of Applied Computer Science

1 2008

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3D Finite Element Estimation of Stray Losses in Three-Phase Transformers

Venegas Vega M. A., Escarela Perez R., Niewierowicz T.

Journal of Applied Computer Science

2008

Vol. 16, nr 1

89-100

Stray losses and flux leakages of a three-phase three-limb transformer are determined and analyzed using 3D finite element analysis. The problem is not current driven but voltage fed. Thus, a circuit-field problem is established and solved. The operating condition analyzed is the load-loss test. Since low excitation voltages are excited during this test, the transformer works under unsaturated conditions. As a result, the transformer is modelled using a time-harmonic approach. The transformer geometry is truly three dimensional, forbidding the use of conventional 2D models. The clamp plates and transformer tank are conveniently modelled with surface impedance boundary conditions.