What are the total lubricants used in transformer oil for power transformers?

The total lubricants used in transformer oil for power transformers primarily include mineral oils and synthetic esters. These lubricants serve to provide electrical insulation, cooling, and protection against oxidation and moisture. Additionally, additives such as antioxidants, corrosion inhibitors, and anti-foaming agents are incorporated to enhance the performance and longevity of the transformer oil, ensuring reliable operation of power transformers.