This article is the continuation of the paper: “Detection and reduction of high temperature in high current turrets of generator step-up (GSU) transformers – Part I” published in the April 2022 issue of “Transformers Magazine”, where the author demonstrated that the heating issue in the low voltage (LV) turrets of a 90 MVA GSU transformer is produced by the low carbon steel employed in the LV turret structure and by the presence of short non-magnetic stainless steel (SS) inserts located in the turrets which were manufactured by the original transformer manufacturer. This new article presents the magnetic solution for the heating issue found in the LV low carbon steel turrets of this 90 MVA GSU transformer. Utilizing Multiphysics finite element simulations and parametric analyses, the author demonstrates that modifying and varying the geometry
of the original short SS inserts is possible to reduce the temperature in the low carbon steel turrets of the GSU transformer. This article demonstrates that by elongating and increasing the width of the original short SS inserts it is possible to reduce the temperature in the low carbon steel turrets of the GSU transformer. The magnetic solution presented in this article could be implemented on-site without the need to send the transformer to repair and avoid taking out of service the transformer for a long time
