What are acceptable temperature rise limits for transformer oil?

Acceptable temperature rise limits for transformer oil typically range from 30°C to 40°C above the ambient temperature. For mineral oil, the maximum allowable temperature is generally around 95°C, while for synthetic oils, it can be higher, up to 120°C. These limits ensure optimal performance and longevity of the transformer, preventing thermal degradation and maintaining insulation integrity. Regular monitoring of oil temperature is essential for safe operation.