Optimum design of ampere-turn balance for power transformer

There are very important relations between transverse magnetic leakage and the ampere-turn balance for power transformer, which also enormously influence the axial short-circuit electromagnetic force acting on the transformer windings and dynamic stability. In this paper, a novel method of ampere-turn distribution is presented, and the annealing algorithm is used to optimize the distributions of ampere-turns. The model of 110 kV power transformer is taken as an example for calculating. Results show that, after optimization, unbalanced ampere-turn is smaller than the former. The electromagnetic force, dynamic stress, and dynamic displacement on coil disks are simulated with the finite element software. Meanwhile, results demonstrate the electromagnetic force, dynamic stress and dynamic displacement are decreased to a certain extent.