What are the major reasons for the transformer failure

Explain the major causes of transformer failure

The most common cause of transformer failure is insulation failure; it deteriorates due to heat, oxidation, acidity, and moisture. Line surges such as switching surges, voltage spikes, line faults, and also because of distribution abnormalities.

It would also cause because of

Poor earthing system

Low insulation cables

Low or non-availability of oil

Poor winding and improper Termination

Overload and excess voltage