What is oil filled self cooled type transformer?

Answer 1

Transformers like other electrical equipment, produce heat. The heat has to be removed to keep the temperatures below maximum levels. There are various methods to do this. Using water is a efficient method; but cannot be done directly as water can be conductive. In the 'Oil immersed water cooled method', the entire transofmer is immersed in a tank filled with insulating mineral oil. Heat from the windings and core is transfered to the insulating oil and therefore heats up the oil. Water pipes run along the tank, in contact with the oil. Heat from the oil is now transfered to the water. This is a very efficient method of cooling especially when the voltages involved are high.

Answer 2

Oil filled self-cooled type uses small and medium-sized distribution transformers. The assembled windings and core of such transformers are mounted in a welded, oil-tight steel tanks provided with a steel cover. The tank is filled with purified, high quality insulating oil as soon as the core is put back at its proper place. The oil helps in transferring the heat from the core and the windings to the case from where it is radiated out to the surroundings. For smaller sized transformers the tanks are usually smooth surfaced, but for large size transformers a greater heat radiation area is needed, and that too without disturbing the cubical capacity of the tank. This is achieved by frequently corrugating the cases. Still larger sizes are provided with radiation or pipes.

Answer 3

To help disperse internal heat.