What are the specifications for transformer oil used in power transformers?

The specifications for transformer oil used in power transformers include a minimum dielectric strength of 30 kV, a flash point above 140�C, and a pour point typically below -30�C. Additionally, transformer oil should have low water content, generally less than 50 ppm, and a high oxidation stability to prevent degradation. The oil must also comply with standards such as ASTM D3487 or IEC 60296 to ensure reliability and safety in electrical applications.