The influence of transposition angle on three-dimensional global domain magnetic field of stator bar in water-cooled turbo-generator

In this paper, a 600 MW turbo-generator is used as an example. Three-dimensional (3-D) physical model of transposition bars in a single stator slot is established. Field-circuit coupling method is combined in 3-D numerical calculation. The influence of transposition angle on three-dimensional global domain magnetic field of stator bar in water-cooled turbo-generator is researched. The distribution changes of flux density, maximum current and circulating current loss in the corresponding transposition structure are obtained. New solution and theoretical basis will be provided for the structure optimization design of the stator bar.