What are the IEC 60296 specifications for transformer oil?

IEC 60296 specifies the requirements for insulating oils used in power transformers, focusing on their physical and chemical properties. Key specifications include a minimum flash point of 135°C, a dielectric strength of at least 30 kV for 2.5 mm gap, and a maximum water content of 30 mg/kg. Additionally, the oil must exhibit low acidity, good oxidation stability, and compatibility with materials used in transformers to ensure reliable performance and longevity.