What are the technical aspects of how to make transformer oil?

The technical aspects of how to make transformer oil involve refining crude oil through a process of distillation and purification. This includes removing impurities, such as sulfur and aromatic compounds, to ensure high dielectric strength and thermal stability. The oil is then treated with additives to enhance its performance, including oxidation inhibitors and pour point depressants. Finally, the oil undergoes rigorous testing to meet industry standards for electrical insulation and cooling efficiency in power transformers.