Oil Immersed Power Transformers Are Classified By Cooling Method

According to the cooling method, it can be divided into oil immersed power transformer and dry type power transformers.

Oil immersed power transformers rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled, forced oil circulation, etc. Dry type power transformers rely on air convection for natural cooling or fan cooling, and are mostly used in small-capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.

1.2.1 Oil immersed power transformers are classified according to the shell type:

1) Non-enclosed Oil immersed power transformers mainly include S8, S9, S10 and other series products, which are widely used in industrial and mining enterprises, agriculture and civil buildings.

2) Enclosed Oil immersed power transformers: mainly include S9, S9-M, S10-M and other series products, which are mostly used in places with a lot of oil and chemicals in the petroleum and chemical industries.

3) Sealed Oil immersed power transformers: mainly include BS9, S9-, S10-, S11-MR, SH, SH12-M and other series products, which can be used for power distribution in various places such as industrial and mining enterprises, agriculture, and civil buildings.

1.2.2 Dry type power transformers are divided into:

1) Encapsulated coil dry type power transformer: mainly SCB8, SC (B) 9, SC (B) 10, SCR-10 and other series products, suitable for high-rise buildings, commercial centers, airports, stations, subways, hospitals, factories and other places.

2) Non-encapsulated coil dry type power transformers: mainly include SG10 and other series products, which are suitable for high-rise buildings, commercial centers, airports, stations, subways, petrochemical and other places.