What are the properties of transformer insulating oil?

Transformer insulating oil properties include excellent electrical insulation, high dielectric strength, low viscosity for efficient cooling, thermal stability to withstand high temperatures, chemical stability to resist oxidation, and a high flash point for safety. It also offers good water separation capabilities and has low pour points to maintain fluidity in low temperatures. These properties ensure the reliable operation of transformers by providing electrical insulation and efficient heat dissipation.