ABSTRACT
Power losses, hotspots, and screening in large power transformers are critical issues that need to be monitored, and sufficient precautionary and fail-safe mechanisms are to be put in place because they can affect not only active parts of the transformer but can destroy the whole transformer unit. Stray fields, losses, forces, temperatures, and so on are calculated usually for short circuit, quasi-static condition of transformer. Overheating hazard of inactive parts for large transformers is one of the key factors of reliability for the unit and even for the whole power supplies system. Finite element method simulations have been carried out to find out cost-effective materials for tank plates of pad-mounted transformers. Large power transformers with their optimally utilized materials and limited transportation outlines, are complicated, delicate, and extremely efficient electromagnetic structures. Literature on electromagnetics offers at least 15 basic methods of field computation and much more combined and hybrid ones.
