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In system of 6.6kv there is busbar differential protection is provided.
The operating philosophy is of 2 incomer & 1 buscoulpers ( With TWO incomers ON & Buscopler OFF).
The busbar differential scheme is of 2X87 type (respective bus has its differential protection)
Case -1
TWO incomers ON & Buscopler OFF
Any fault happened say at Bus A in switchboard at the outgoing feeders of boards -The Incomer-1 Trips & also the Outgoing feeder trips
Case -2
Incomers-1 ON, Incomer -2 OFF & Buscopler -ON
1) what will happen if the fault occur at BUS -B (which is now fed from Incomer -1)?
2)what will happen if the fault occur at BUS -A?
What should be ideal Design?
The operating philosophy is of 2 incomer & 1 buscoulpers ( With TWO incomers ON & Buscopler OFF).
The busbar differential scheme is of 2X87 type (respective bus has its differential protection)
Case -1
TWO incomers ON & Buscopler OFF
Any fault happened say at Bus A in switchboard at the outgoing feeders of boards -The Incomer-1 Trips & also the Outgoing feeder trips
Case -2
Incomers-1 ON, Incomer -2 OFF & Buscopler -ON
1) what will happen if the fault occur at BUS -B (which is now fed from Incomer -1)?
2)what will happen if the fault occur at BUS -A?
What should be ideal Design?