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The synchronous reactance of a machine represents

  • A.the reactance of the damper winding in the pole faces
  • B.the combined effect of leakage and armature reaction
  • C.the resistance of the armature winding under load
  • D.the reactance of the field winding on the rotor

Answer: B

Leakage flux and the field the armature current itself sets up are lumped into one reactance for steady-state work. Its value in per unit is typically greater than one, which is why the pull-out power is of the order of the machine rating.

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