Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 percentage impedances are equal
 turn- ratios are exactly equal
 KVA ratings are equal
 polarities are properly connected

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop synchronous motor torque.
  the damper bars develop induction generator torque.
  the damper bars develop induction motor torque.
  negative sequence currents are generated.

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