The capacity range of S11 three-dimensional wound core transformer is 30-2500KVA. The core has a three-phase three-column structure with wrapped internal and external frames. The transformer has a high degree of mechanization and a large lamination factor. High and low voltage coils are continuously wound on core columns, so that the concentricity is good and the coils are tight. The main technical and economic indicators have reached the international advanced level of similar products.