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?

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SSC JE EE Previous Paper 12 (Held on: 24 March 2021 Evening)
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  1. Only frequency
  2. Voltage, frequency and phase sequence; and the phase difference between the alternator and infinite voltages must be zero
  3. Only voltage
  4. Only phase sequence

Answer (Detailed Solution Below)

Option 2 : Voltage, frequency and phase sequence; and the phase difference between the alternator and infinite voltages must be zero
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Detailed Solution

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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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