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The silica gel breather of a transformer prevents

  • A.oil from expanding into the conservator
  • B.heat from escaping through the tank walls
  • C.moisture from entering with the breathing air
  • D.gas from escaping during an internal fault

Answer: C

Correct answer: moisture from entering with the breathing air

As the oil expands and contracts the conservator must breathe, and the air drawn in would carry moisture that would dissolve in the oil and destroy its dielectric strength. The silica gel breather dries that air. The gel changes colour as it becomes saturated, which is why it is a routine inspection item.

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