Abstract:The iron core is the transmission path of the main magnetic flux of a transformer, and the iron core model is an indispensable part in the simulation modeling of transformer magnetic field. The finite element method was used to establish three types of iron core models, namely, sheet shaped, rectangular homogenized, and cylindrical. By applying short circuit current excitation, the variation rules and distribution comparisons of leakage magnetic flux density and electromagnetic force density under different models were obtained. Finally, a simulation comparison of the cumulative effect deformation of windings is conducted using the actual sheet shaped simulated iron core model as a reference. The simulation results show that the error of both rectangular and cylindrical iron cores is within 10%, indicating that rectangular and cylindrical iron cores can provide a reference for modeling methods when improving the efficiency of transformer related simulation.