Analysis on Eddy Current Losses in Stator Windings of Large Hydro-Generator Considering Transposed Structure Based on Analytical Calculation Method

Abstract

Aimed at the problem that the existing calculation method of eddy current losses in stator windings of large hydro-generators cannot consider the transposed structure and circulating current, the equivalent circuit model considering the actual transposed structure and circulating current is established, and the analytical calculation method for eddy current losses of stator winding is proposed in this paper, which is suitable for different transposed structures. Then, eddy current losses of stator transposed winding in an 180MW hydro-generator is analyzed by the proposed method and validated by the finite element method. Finally, the influence of the transposed structure on eddy current losses of stator windings is analyzed quantitatively and compared with the existing calculation method. The results show that the value and distribution trend of eddy current losses in strands change a lot when considering the influence of circulating current and the actual transposed structure, and the influence is different for different transposed structures, which must be considered.