3-dimensional computation of transformer leakage fields and associated losses

Numerical methods, based on a magnetic scalar potential function, have been used to compute three-dimensional leakage fields and leg-plate losses in large power transformers. Fast convergence is obtained. The currents induced in the leg-plate are calculated by a simple modification of the static scalar-potential formulation. This includes three-dimensional, flux perturbation, and plate edge effects. The results show that two-dimensional approximations are unsatisfactory.