Improving the thermal performance of transformer oil by modifying fin shapes

A suggested distribution transformer thermal model is studied. A Finite Element Method (a 2-D steady-state thermal analysis) was used to find the fin shapes effect on the thermal performance for the 3Ø transformer specified as (250 kVA, 11/.416 kV, oil-immersed, core type) utilizing "ANSYS, Workbench". Several fin shapes have been used and compared between them to get the best result. Where the traditional rectangular fin was divided into two, three, and four pieces, it found the average oil temperature improved by about 3% when divided the fin into four sections. as well as the method of perforating the fin with circular and square holes was used and the number of holes was increased from one to four and compared between them, it obtained the heat transfer enhanced and the average oil temperature improved by 4.5 % after perforation fin into four square holes and it was 8% when using fin with four circles holes. Results show that the best fin thermal performance was in the case of piercing with four circular holes.