What are the specifications and requirements for oil in power transformers?

The specifications and requirements for oil in power transformers include high dielectric strength, low viscosity, and excellent thermal conductivity. The oil must meet ASTM D3487 standards, ensuring it is free from impurities and has a flash point above 140°C. Additionally, it should possess good oxidation stability and low water content to prevent degradation. Regular testing for acidity, furan content, and dissolved gases is essential to maintain transformer performance and longevity.