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A Buchholz relay is used for
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- protection of a transformer againts all internal faults
- protection of a transformer against external faults
- protection of a transformer against both internal and external faluts
- protection of induction motors.
Correct Option: A
Buchholz relay is mechanical sensing device used in transformer. It will act or close the electrical contacts whenever there is sudden rise of oil pressure inside the transformer, or if there is more gas collection due to the decomposition or burning of transformer material inside. So this device will only sense the internal fault of transformers. Hence choice (a) is correct.
