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The sudden three-phase short circuit current of a synchronous generator is initially limited by

  • A.its subtransient reactance
  • B.its synchronous reactance
  • C.its transient reactance
  • D.its armature resistance alone

Answer: A

Flux is trapped in the damper winding and the rotor body for the first cycles, giving the smallest reactance and the largest current. As those currents decay the reactance rises through the transient to the synchronous value.

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