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An incoming alternator is to be synchronised with an already operating alternator. Which of the following conditions is NOT necessary to be satisfied?

An incoming alternator is to be synchronised with an already operating alternator. Which of the following conditions is NOT necessary to be satisfied? Correct Answer Same prime mover speed

Synchronization of alternator means connecting an alternator into the grid in parallel with many other alternators, which is in a live system of constant voltage and constant frequency.

Before connecting an incoming alternator with an already operating alternator, the following conditions must be satisfied:

Equal voltage: The terminal voltage of incoming alternator must be equal to the bus-bar voltage.

Same frequency: The frequency of generated voltage must be equal to the frequency of the bus-bar voltage.

Phase sequence: The phase sequence of the three phases of alternator must be similar to that of the grid or busbars.

Phase angle: The phase angle between the generated voltage and the voltage of the grid must be zero.

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