What is the flash point of transformer oil?

The flash point of transformer oil is an important property that indicates the minimum temperature at which the oil can form an ignitable mixture in air. This property is crucial for ensuring safety in electrical installations. Transformer oil typically has a flash point in the range of 140°C or 284°F. This temperature indicates that at or above this point, the oil can produce enough vapors to ignite when exposed to an open flame or spark.

Understanding the flash point helps in determining safe operating conditions for electrical equipment. Transformer oils are chosen not only for their insulating properties but also for their higher flash points, which provide an added safety margin during operation, especially in environments where heat could potentially lead to ignition.

The other options reflect lower flash points, which would compromise safety, as they would be more prone to ignition at typical operational temperatures of electrical equipment. The correct choice aligns with industry standards and the physical properties of widely used transformer oils.