Why do large transformers heat up? Identify the dominant causes. Large power transformers heat and are oil-cooled; select the main physical loss mechanisms causing the heating. Choose the correct option.

Q: Why do large transformers heat up? Identify the dominant causes. Large power transformers heat and are oil-cooled; select the main physical loss mechanisms causing the heating. Choose the correct option.

Concept Core (iron) losses: hysteresis + eddy currents in the magnetic core. Copper losses: I²R heating in primary and secondary windings. Final Answer Core losses (hysteresis and eddy currents) and copper losses (I²R in windings)

Difficulty: Easy

Core losses (hysteresis and eddy currents) and copper losses (I²R in windings)
Only radiation from the tank
Only mechanical vibration
Cooling oil chemical reactions

Correct Answer: Core losses (hysteresis and eddy currents) and copper losses (I²R in windings)

Explanation:

Concept

Core (iron) losses: hysteresis + eddy currents in the magnetic core.
Copper losses: I²R heating in primary and secondary windings.

Final Answer
Core losses (hysteresis and eddy currents) and copper losses (I²R in windings)

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