Transformer Insulating Oil is used in the transformer for insulation and cooling purpose. The transformer oil is obtained by fractional distillation and subsequent treatment of crude petroleum and the transformer oil is also known as Mineral Insulating oil.

The heat generated in the transformer gets transferred to oil and the heat gained by the transformer oil gets transferred to the transformer radiators through convection. Finally the heat is released from the transformer radiator to the air through radiation. The mineral oil is good conductor of heat and a bad conductor of electricity. This virtue of mineral insulated oil makes it  most suitable for oil filled transformer.

The transformer insulating oil also protects the winding and core of the transformer. It acts as an insulation between the core and winding and thus stops any oxidation reaction by avoiding direct contact of the oxygen with the core and winding.

Types of Transformer Oil:

There are two types of transformer Mineral oil.

Naphtha Based Transformer Insulation Oil

Paraffin Based Transformer Insulation Oil