I think this explanation is not entirely correct. The circuit breaker is not closed until the synchroscope stops moving and points to 12 o'clock. That is why it is labeled slow and fast. If it were spinning in the fast direction, as shown, then there is a RPM mismatch and the generator to be added is running too fast. When it stops moving and points to 12 o'clock then the phase angles are matched. In the old days they just used three lights. When all three lights stopped flashing and stayed-off then the two generators were synched and it was safe to close the main breaker.
It does not stop rotating when it reaches the 12 o'clock position. There will be a slight mismatch in the parameters. As the parameters get closer to matching, the pointer's rotation slows down when approaching the 12 o'clock position. We need to close the GCB at that moment; otherwise, we'll have to wait for the next opportunity.
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I think this explanation is not entirely correct. The circuit breaker is not closed until the synchroscope stops moving and points to 12 o'clock. That is why it is labeled slow and fast. If it were spinning in the fast direction, as shown, then there is a RPM mismatch and the generator to be added is running too fast. When it stops moving and points to 12 o'clock then the phase angles are matched. In the old days they just used three lights. When all three lights stopped flashing and stayed-off then the two generators were synched and it was safe to close the main breaker.
It does not stop rotating when it reaches the 12 o'clock position. There will be a slight mismatch in the parameters. As the parameters get closer to matching, the pointer's rotation slows down when approaching the 12 o'clock position. We need to close the GCB at that moment; otherwise, we'll have to wait for the next opportunity.
There must be a better way.