An oil-filled pole-mounted distribution transformer comprises a tank housing a
transformer core-coil assembly immersed in cooling oil. The tank is made of a corrosion-proof
composite material and a radiator is provided for cooling the oil. The radiator
is external to the tank and has a hot oil inlet and a cool oil outlet located at
different levels into the tank for causing a natural circulation of oil through
the radiator by thermal siphoning.
