Amarasinghe, RPWSKumara, WGKPRajapaksha, RAKGRupasinghe, RADKWijayapala, WDAS2018-09-062018-09-06http://dl.lib.mrt.ac.lk/handle/123/13460This paper presents a methodology to design hermetically sealed shell type oil immersed distribution transformers with minimum evaluated cost according to the IEC standards. Distribution transformer model and design constraints are implemented as a user friendly software using MATLAB. An objective function for total evaluated cost is optimized subjected to ten constraints according to IEC 60076 in addition to geometrical constraints. A design example on a 630kVA transformer is presented for illustration.enCost functionDesign optimizationDielectric lossesEddy currentsHysteresisImpedanceInductanceMATLABTransformersTransformer cores.Transformer coresConference-AbstractEngineeringDepartment of Electrical Engineering2015Moratuwa Engineering Research Conference - MERCon 2015Moratuwa, Sri Lankawaruna_10@ elect.mrt.ac.lkkelum_10@ elect.mrt.ac.lkgayantha_10@elect.mrt.ac.lkdinusha_10@ elect.mrt.ac.lkanura@elect.mrt.ac.lk