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Short-circuit forces in a transformer winding vary as

  • A.the current itself, in direct proportion
  • B.the square root of the current
  • C.the inverse of the current
  • D.the square of the current

Answer: D

Two conductors carrying current attract or repel in proportion to the product of their currents, which for a single winding means the square. That is why a transformer's mechanical bracing is designed for the fault case rather than the normal one.

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