Tytuł pozycji:
3D Finite Element Estimation of Stray Losses in Three-Phase Transformers
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.