How does temperature affect transformers?

Once a transformer overheats, its insulation lifespan is drastically shortened. Statistics show that the average annual accident rate for transformers of 110 kV and above is approximately 0.69%, with the highest proportion of cases involving winding burnout due to insulation aging and breakdown caused by prolonged overheating. Although heavy gas protection is not electrical protection, it can trigger an alarm when temperatures are abnormal, demonstrating that temperature measurement is not a dispensable auxiliary device, but rather the first line of defense against accidents.