About Double bus double breaker arrangement

here we are going to see About Double bus double breaker arrangement

• In double bus double breaker arrangement the feeder are connected in parallel to both buses with the help of two circuit breakers and four isolator switches instead of bus coupler
• Here we can connect to any bus with any feeder but before closing the breaker the related two isolator has to be closed first same way when we denergize condition first breaker has to open then there corresponding isolate has to open

it’s Advantages
1.During fault on any bus or any fault conditions, the load can be transferred from one bus to other bus so there will not be any power supply interruption.
2. we are not using a B/c so there will not be much delay in power supply while closing circuit breaker to transfer load from one bus to another bus.
3. Any breaker can be taken out of service for maintenance without disturbing the load
4.Load sharing is easy
5. High flexibility.
Disadvantage
1.Here circuit breakers we used is double so cost is very high.
2. Maintenance cost will also high.