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A three phase synchronous generator is to be connected to the infinite bus. The lamps are connect ed as shown i n t he fi gur e for t he synchronization. The phase sequence of bus voltage is R– Y– B and that of incoming generator voltage is R' – Y' – B'.
It was found that the lamps are becoming dark in the sequence La – Lb – Lc. It means that the phase sequence of incoming generator is
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- Opposite to infinite bus and its frequency is more than infinite bus
- Opposite to infinite bus but its frequency is less than infinite bus
- Same as infinite bus and its frequency is more than infinite bus
- Same as infinite bus and its frequency is less than infinite bus
Correct Option: A
As per the given connection of Lamp’s they are becoming dark in the sequence La – Lb Lc. Hence the phase sequences is opposite to infinite laws and frequency.
