What is the primary purpose of 'Thermal Overheating Protection' in a transformer?

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  1. To protect against overvoltage conditions in the power system
  2. To detect and protect against short circuits in the transformer windings
  3. To monitor and prevent excessive temperature rise in the transformer
  4. To detect faults in the transformer cooling system

Answer (Detailed Solution Below)

Option 3 : To monitor and prevent excessive temperature rise in the transformer
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Thermal Overheating Protection in a Transformer

​Transformer overheating protection involves strategies to prevent damage caused by excessive heat, typically using temperature sensors, alarms, and forced ventilation. These measures ensure the transformer operates within safe temperature limits and prevents damage from overloading or other faults. 

Thermal Overheating Protection in a transformer is specifically designed to:

  • Monitor the internal temperature of the transformer.
  • Prevent damage due to overheating, which can degrade insulation and reduce transformer life.
  • Trigger alarms or shut down the transformer if the temperature exceeds safe thresholds.
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