Skin effect with pulse magnetization of strap toroidal magnetic core

The diffusion of pulse magnetic field into metal of a toroidal magnetic core made by winding of a transformer steel strap is considered. The 1-D numerical model was developed which take into account the viscous-type dynamic losses of magnetization, as well as the eddy currents. The processes of magnetic field propagation in the strap at switch-on the transformer to the voltage source have been analyzed. The results of the experiments confirming the obtained results are presented.