Three conditions must be fulfilled before an incoming alternator can be connected to the live busbar system.
i) The voltage of the incoming alternator must be same or within acceptable limits of the busbar voltage. This to be checked from the Voltmeter.
ii) The frequency of the incoming alternator must be same or within acceptable limits olthe busbar frequency.However in practice, the incoming alternator frequency is to be kept slightly higher, i.e. synchroscope to move clockwise at a slow speed, because when it will come on load there will be drop in speed and then it will match with the busbar frequency.
iii) Phase angle of the incoming alternator must be matched with that of the busbar, indicated by the synchroscope pointer at 12'0 clock position. Which means phase angle difference between corresponding phases of incoming alternator and that of bulbar must be zero or within acceptable limits.
i) The voltage of the incoming alternator must be same or within acceptable limits of the busbar voltage. This to be checked from the Voltmeter.
ii) The frequency of the incoming alternator must be same or within acceptable limits olthe busbar frequency.However in practice, the incoming alternator frequency is to be kept slightly higher, i.e. synchroscope to move clockwise at a slow speed, because when it will come on load there will be drop in speed and then it will match with the busbar frequency.
iii) Phase angle of the incoming alternator must be matched with that of the busbar, indicated by the synchroscope pointer at 12'0 clock position. Which means phase angle difference between corresponding phases of incoming alternator and that of bulbar must be zero or within acceptable limits.
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