What type of oil is used for transformer?

The type of oil used in transformers is typically mineral oil, specifically refined mineral oil. This type of oil is commonly used due to its excellent insulating properties and high dielectric strength, which help to prevent electrical breakdown and arcing within the transformer.

Mineral oil used in transformers is specially refined to remove impurities and contaminants that could affect its performance or cause damage to the transformer. It also undergoes processes to improve its stability and resistivity over time, ensuring long-term reliability.

In addition to its insulating properties, mineral oil also serves as a coolant, helping to dissipate heat generated during the operation of the transformer. This is particularly important in large transformers where efficient heat dissipation is crucial to maintaining optimal operating temperatures and prolonging the lifespan of the transformer.

While mineral oil is the most common type of oil used in transformers, there are also alternative options available, such as silicone-based oils or vegetable-based oils, which may be used in specific applications where environmental concerns or fire safety considerations are a priority. However, mineral oil remains the predominant choice for most transformer applications due to its proven performance, reliability, and cost-effectiveness.