Oil-immersed transformers use oil as the main insulation method and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling, and forced oil circulation, etc.
The main components of a transformer include the core, windings, oil tank, oil reservoir, respirator, explosion-proof tube (pressure release valve), heat exchanger, insulation bushing, tap changer, gas relay, thermometer, and purifier, etc.

Montius nos tumore inusitato quodam et novo ut rebellis et maiestati recalcitrantes Augustae per haec quae strepit
Montius nos tumore inusitato quodam et novo ut rebellis et maiestati recalcitrantes Augustae per haec quae strepit