What is an oil immersed transformer?

Oil-immersed transformers use oil as the main insulating means of the transformer and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled and forced oil circulation. The main components of the transformer are iron core, winding, oil tank, oil pillow, respirator, explosion-proof pipe (pressure release valve), radiator, insulating sleeve, tap changer, gas relay, thermometer, oil purifier, etc.