PPT Slide
Oil and/or air cooled (to facilitate heat transfer of core and copper losses)¾forced (fans & pumps) and/or convection
Oil also has a higher dielectric strength than air so it’s an insulator too
Core is laminated (to combat eddy-current losses)
Windings are made of (insulated) solid or stranded copper or aluminum wires
Section 12.6: Transformer Construction