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The slip test on a salient pole machine determines

  • A.the subtransient reactance of the machine
  • B.the short circuit ratio of the machine
  • C.the direct and quadrature axis reactances
  • D.the synchronous impedance from the two characteristics

Answer: C

Driving the machine at a little away from synchronous speed with a small unexcited voltage applied makes the armature current swing between two limits as the poles slip past the field. The ratio of voltage to current at each limit gives the two reactances.

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