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The dielectric strength of transformer oil is reduced most by

  • A.a rise in its viscosity with age
  • B.an increase in its flash point
  • C.the presence of dissolved nitrogen
  • D.dissolved moisture

Answer: D

Even a few parts per million of water lowers the breakdown voltage sharply, which is why the breather dries the incoming air and the oil is filtered and dried in service. Particles and acidity from ageing also contribute.

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