Thus to summarize, all the connected feeders to the bus must open on actuation of busbar protection. Since all the feeders-2, 3 & 4 are connected to Grid, they may feed fault as Grid is an immense source of power. You might think that only CB-1 should open. This means that, breaker CB-1, 2, 3 & 4 must open during actuation of busbar protection. To protect the bus from faults, it is mandatory to disconnect it from all the power sources as soon as possible. Suppose there occurs a fault in the bus as shown in figure below. Thus it is clear from above discussion that, busbar arrangement improves the reliability of system. In this case, the station will either run on house load or will trip its generator. 2,3&4 trips, the generated power will not be evacuated. But if it happen so that all the feeders i.e. Under this case, the generator power will be evacuated through busbar by Feeder-3&4. In case there occurs any fault in any feeder (say in Feeder-2), the respective breaker CB-2 will trip. This means that the generator power is evacuated by remaining three feeders i.e. Figure below depicts a single bus to which four feeders are connected.
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