MV Power plant

[Coca1995]

Hey guys,

Newbie eng here. Working on a powerplant design where we have 4 x2.5 MW, 4.16 kV generator and one backup generator which only operates when one of the 4 generator is down to achieve N-1 redundancy. Issue is i cant decide on which bus system to be used. Using a common bus seems more favourable. My question being do i need to worry about frequent bus faults in 10 MW natural gas system? Whats your opinion?

 

[TugboatEng]

Normally one would split the bus with any redundant loads divided between the busses. If the emergency generator is not capable of running the entire plant then a third bus is applied wich supports critical loads only. This simplifies load shedding. The busses are interconnected by tie breakers and run as a common bus under normal operation.

 

[cranky108]

This would be to many devices for a ring bus, but a breaker and a half is possible. The down side is it requires 50% more breakers. Best arrangement is source/load on each rung.