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Dissolved gas analysis of transformer oil is used to

  • A.identify the type of incipient internal fault
  • B.measure the moisture content of the oil directly
  • C.determine the turns ratio of the windings
  • D.measure the temperature rise of the windings

Answer: A

Different faults produce characteristic mixtures of hydrogen, methane, acetylene and the rest, so the ratios point to overheating, partial discharge or arcing. It is the principal condition-monitoring tool for a large transformer.

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