What are the ASTM D3487 specifications for transformer oil?

ASTM D3487 specifies the standard for mineral insulating oils used in electrical transformers. Key requirements include physical properties such as viscosity, density, and flash point, as well as chemical properties like acidity, water content, and dielectric strength. The specification ensures that transformer oil maintains electrical insulation performance and thermal stability, thereby enhancing the reliability and efficiency of power transformers in operation. Compliance with these standards is crucial for optimal transformer performance.