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Synchronising power of a machine on a network is

  • A.the power required from the prime mover to bring it up to speed
  • B.the reactive power it exchanges with the network at no load
  • C.the power lost in its damper winding during a disturbance
  • D.the power that acts to restore it to its correct phase after a disturbance

Answer: D

Any departure from the equilibrium angle produces a power that pulls the rotor back, and its magnitude per radian is the synchronising power coefficient. A machine with a small coefficient is loosely tied to the system and swings a great deal.

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