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<p style="text-align:justify"><span style="font-size:14px">In a single bus system with a bus sectionalizing breaker, as shown in figure 7.32, if incomers I<sub>1</sub> and I<sub>2</sub> are fed from two different sources, when B<sub>1</sub> or B<sub>2</sub> is made ON (sectionalizing breaker is ON), the synchronizing conditions are required to be checked. This means that (a) bus voltage and incomer (one that is being connected to the bus) voltage must be same, (b) bus frequency and incomer frequency must be same and (c) the instantaneous value of the voltage wave of bus and that of the incomer must be same. These conditions are checked by the numerical overcurrent relay (connected in the incomer) very fast and the concerned breaker is closed at the correct instant. This facility is known as Fast Bus Transfer.</span></p>