What are the requirements specified in iec standard for transformer oil?

The IEC standard for transformer oil, specifically IEC 60296, outlines several key requirements. These include a minimum breakdown voltage of 30 kV, a maximum water content of 30 mg/kg, and a flash point above 140°C. Additionally, the oil must exhibit low acidity, good oxidation stability, and appropriate viscosity at operating temperatures. Compliance with these specifications ensures optimal performance and longevity of power transformers.