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A bus coupler circuit breaker is utilized in a substation for
Joining the transmission line with station busbar
Joining main and transfer bus in a substation
Joining the generator with transfer
Joining the neutral of the generator with earth
Joining main and transfer bus in a substation
A bus coupler circuit breaker is a vital switching device used to connect two separate busbar sections in a substation. Its primary purpose is to allow for the transfer of load between the main bus and the transfer bus or to provide flexibility during maintenance without interrupting power supply.
A bus coupler circuit breaker is a vital switching device used to connect two separate busbar sections in a substation. Its primary purpose is to allow for the transfer of load between the main bus and the transfer bus or to provide flexibility during maintenance without interrupting power supply.
IbusтАЛ=I1тАЛ+I2тАЛ тАФ Summation of load currents during bus coupling
During normal operation, the bus coupler breaker is typically kept open if the buses are to be isolated. When a specific bus section requires maintenance, the bus coupler is closed to parallel the two bus systems, allowing the load to be shifted from the bus under maintenance to the healthy bus, after which the sectionalizing disconnectors are opened.
Used for load transfer between busbars
Essential for substation maintenance flexibility
Reduces downtime during routine maintenance of circuit breakers or isolators
Allows bus sectionalizing to limit short-circuit current
Improved power system reliability
Operational flexibility during maintenance
Provision for sectioning the bus system
Increased initial substation cost
Requirement for additional control and relaying protection
Increased complexity in switching operations
Double busbar systems
Main and transfer busbar schemes
Substations where high reliability is mandated
A bus coupler is also known as a bus tie breaker.
Option A is incorrect as a feeder circuit breaker performs this task.
Option D is incorrect as neutral earthing is performed via Grounding Transformers or NGRs.
B is correct тАФ The bus coupler circuit breaker specifically acts as the bridge to connect the main busbar to the transfer busbar in a substation arrangement.
Remember that 'Bus Coupler' is for bus-to-bus switching, while 'Feeder' breakers are for line-to-bus connections; always distinguish between the two for substation layout questions.