What is the process for transformer insulating oil?

The process for transformer insulating oil involves several key steps, including refining crude oil to remove impurities, followed by the addition of additives to enhance performance. The oil is then subjected to degassing and filtration to eliminate moisture and air, ensuring optimal dielectric strength. Finally, the transformer insulating oil is tested for quality parameters such as viscosity, acidity, and flash point before being used in power transformers to provide electrical insulation and cooling.