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?

Question

Question

This question was previously asked in

SSC JE EE Previous Paper 12 (Held on: 24 March 2021 Evening)

Only frequency
Voltage, frequency and phase sequence; and the phase difference between the alternator and infinite voltages must be zero
Only voltage
Only phase sequence

Answer 1

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.