Computation of 3-D Magnetic Leakage Field and Stray Losses in Large Power Transformer

A time-stepping finite element method combining analytical and numerical solutions for laminated-material homogenization is proposed to calculate 3-D magnetic leakage field and its structural parts stray losses in a 380 000 kVA/500 kV single-phase power transformer, and the high-order harmonics of field components can be considered. To verify the method and computation code, a supplementary model of Team Problem P21 C -M 1 is made. Measured and computed results to the model indicate the validity of the method proposed.