Computing ferrite core losses at high frequency by finite elements method including temperature influence

A finite elements method coupled with the Preisach model of hysteresis is used to compute the ferrite losses in medium power transformers (10-60 kVA) working at relatively high frequencies (20-60 kHz) and with an excitation level of about 0.3 Tesla. The dynamic evolution of the permeability is taken into account. The simple and doubly cubic spline functions are used to account for temperature effects respectively on electric and on magnetic parameters of the ferrite cores. The results are compared with test data obtained with 3C8 and B50 ferrites at different frequencies.<>