Abstract: As the capacity of the transformer continues to increase, the leakage magnetic field of the coil continues to increase, which leads to a rapid increase in the useless circulating current loss induced between the wires during operation. In order to reduce the circulatingcurrent loss, the wire needs to be transposed. The simulation of the single-phase power transformer model by the finite element analysismethod is studied, and a new efficient global optimization algorithm combining the ordinary Kriging model and the particle swarm algorithmis proposed. It also compares and analyzes the circulating current loss of the transformer under different winding wire transposition methods,and obtains the optimal number of turns distribution scheme with the smallest circulating current loss. This method not only guarantees theaccuracy of optimization, but also further shortens the calculation time in optimization. Compared with the design scheme currently appliedin industry, the optimized result has greatly reduced the circulating current loss.

    Key words: power transformer; winding wire transposition; circulating current loss; Kriging model; particle swarm optimization