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A load commutated inverter drive relies for commutation on

  • A.a separate commutation circuit of capacitors and inductors
  • B.the forced turn-off capability of its switching devices
  • C.the damper winding in the pole faces of the rotor
  • D.the machine's own back emf

Answer: D

Running the machine at a leading power factor makes its emf turn the thyristors off, so no forced commutation circuit is needed. That simplicity suits very large drives, though the machine cannot commutate the inverter at standstill.

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