Calculation of stray flux in phase-shifting transformers
The operation of a transformer as a phase shifting transformer generates additional losses due to an increased fraction of stray flux. To determine the stray flux of the transformer windings, as well as the influence of each winding on the magnetic flux density at different locations of the transformer core, a coupled model of the transformer is developed. The model is based on a numerically weak coupling of the FEM with a circuit simulator. Beside the linear calculation, non-linear material properties are considered for the 2D and 3D case.