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A cylindrical synchronous machine connected to an infinite bus power will deliver maximum power at a power angle of

  • A cylindrical synchronous machine connected to an infinite bus power will deliver maximum power at a power angle of δ = 90°
  • In a synchronous machine, the power angle δ is the angle difference between the stator voltage and rotor voltage phasors.
  • When the machine is loaded, there is a relative displacement between the stator and rotor magnetic fields due to the armature reaction and the rotor angle θ begins to change.
  • This change in rotor angle θ leads to a change in power angle δ.
  • The maximum power that a synchronous machine can deliver to an infinite bus occurs when the power angle is equal to 90 degrees.
  • At this point, the synchronous reactance is canceled out by the infinite bus, and the machine is able to deliver maximum power without overloading.
  • Any deviation from this angle reduces the power output of the machine.
  • Therefore, the correct answer is δ = 90°.