What are the technical considerations for what is the oil used in transformer?

The oil used in transformers, typically mineral oil or ester-based fluids, serves as both an insulator and a coolant. Key technical considerations include the oil’s dielectric strength, thermal conductivity, viscosity, and oxidation stability. Additionally, the oil must have a low pour point for effective operation in varying temperatures and should comply with environmental regulations. Regular testing for moisture content and acidity is essential to maintain transformer performance and longevity.