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