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A Buchholz relay on an oil-filled transformer detects

  • A.gas accumulation from an internal fault
  • B.an overcurrent in the secondary winding
  • C.an earth fault on the primary side
  • D.a failure of the cooling fans

Answer: A

Slow deterioration liberates gas that collects in the relay chamber and gives an alarm, while a violent fault surges oil through it and trips the transformer. It is fitted in the pipe between the tank and the conservator.

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