What is Transformer Oil?

Transformer oil can be defined as a special type of oil with outstanding electrical insulating properties. Also known as insulating oil. It is stable at high temperature and is used to prevent arcing in electrical power transformers, to lower the transformer's temperature. So transformer oil acts as a coolant because it protects the windings and core of the transformer as it is immersed in it.
The transformer oil function is used for cooling and insulation. There are different types of materials with different dielectric strength. Therefore, these materials must keep the voltage equal to the dielectric strength. For example, if the voltage of the material is increased relative to the specific dielectric strength of the material, the current will be there throughout the flow.
Oil absorbs moisture in nature very quickly. The dielectric strength of the oil deteriorates with the absorption of moisture. Therefore, a material such as silica gel filled vent is used inside the transformer so that the external moisture in respiration is trapped inside the silica gel. The main functions of transformer oil are cooling and insulation.
Cooling – The design of transformer coils can be made with high current carrying copper to heat these coils. It is an excellent conductor of heat, so using it the temperature of copper coils can be lowered. So the oil in the transformer plays an important role in preventing the coil from burning.
Insulation – Contains high dielectric strength to withstand high voltage. This is the reason why it is used as insulation inside the transformer.