Bus coupler is very essential in the arrangement

Question

RRB Paper · Accepted Answer

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Single bus

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Bus coupler is very essential in the arrangement of Main and transfer bus.
In a power system, it is common to have two or more main buses for redundancy and reliability.
It is important to ensure that the loads on each main bus are balanced to avoid overloading or underloading of the buses.
To achieve this, transfer buses are used to transfer loads between the main buses as required.
A bus coupler is used to connect the main and transfer buses. It is essentially a switch that can connect or disconnect the buses as needed.
When the transfer bus is connected to one of the main buses, the loads on the other main bus are transferred to the connected bus through the transfer bus.
The bus coupler ensures that the voltage and frequency of the two buses are synchronized before the transfer takes place.