Query Regarding Double Bus System

Well said, have a GA point on me.

General understanding of Double Busbar system is there will be two sources of supply and each source will be connected to separate Busbar through circuit breaker. Outgoing to load will be tapped from both the buses through interlocked switches such that at any given time only one switch will be switched on and the respective load will get supply from any one of the buses. Busbar capacity depends on the loads connected to the bus or the capacity of the source. Supposing the double Busbar system gets supply from 1000 kVA transformer 415 V as source 1 and 500 kVA , 415 V DG set as source 2 then the Busbar 1 will be rated for 1600 amps and bus bar 2 will be rated for 800 Amps. Hope this clarifies.

It is simple, the maximum current at any point in the bus bar must be limited to 5000 amps load. You might be able to load each bus separately, but if you have a bus tie, you must limit the current at any point on the bus bar to 5000 amps. If the two buses are totally separated without a tie breaker, then each would be limited to 5000 but you could not tie them together in any way. You really need to look at current flow.

hi,

Useally double bus bar system is used for redunt and also for load sharing ...

as you said each bus can be able of carring the full load of havinfg the 5000A ..

at the time of redunt or any service condition of the other bus