What is the normal oil temperature in a transformer?

The normal oil temperature in a transformer typically ranges between 60°C to 80°C (140°F to 176°F) during operation. However, some transformers may have slightly higher acceptable temperature limits, potentially reaching up to 95°C (203°F) under normal conditions. It’s crucial to monitor the oil temperature consistently to ensure the transformer operates efficiently and to prevent any overheating, as elevated temperatures can lead to accelerated aging of the insulating oil and components. Regular maintenance and oil analysis can help maintain the optimal conditions for the oil tank transformer, ensuring its longevity and performance.