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Before an alternator can be connected to an infinite bus, which of the following must be the same for the alternator and the infinite bus?

Before an alternator can be connected to an infinite bus, which of the following must be the same for the alternator and the infinite bus? Correct Answer Voltage, frequency and phase sequence; and the phase difference between the alternator and infinite voltages must be zero

Necessary condition for parallel operation of two alternators:

  • The phase sequence of the busbar voltages and the incoming machine voltage must be the same
  • The busbar voltages and the incoming machine terminal voltage must be in phase.
  • The terminal voltage of the incoming machine and the alternator which is to be connected in parallel or with the Busbar voltage should be equal.
  • The frequency of the generated voltage of the incoming machine and the frequency of the voltage of the busbar should be equal.
  • The phase difference between the alternator and infinite voltages must be zero.

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