how to make incoming machine inphase to bus bar, when they are in out of phase
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I think, you @satishcan asked something related to this.. A synchroscope switch can be mounted on each alternate panels. When the switch handle is turned to the incoming position the synchroscope is connected to the secondary voltage of one phase of an alternator being synchronized with the AC s/m. The synchroscope switch of a second alternator, which is already parallel with the 3ph s/m, is connected to the run position. Thus, one coil winding of the synchroscope is energized from the running bus bars.
The other winding of the synchroscope is energized from the incoming bus bars. With these connections, synchroscope indicates the extent that the incoming machine is out of phase. When the incoming alternator is in phase with the three phase system and the alternator voltage = to the bus bars, the control switch can be turned to ON position.
As a result, the oil switch cotactors close, and the alternator is parallel with bus bars. the oil ckt breaker is used to connect and disconnect the alternator when it is running under load.
okay, thank you. but if the incoming machine is leading the bus bar by an angle, though the phase sequence is same.
then i have to make that incoming machine to in-phase with bus bar, how i can make them in-phase?