Device KA rating verification study
Device KA rating verification study
(OP)
Device KA rating verification study should be done based on bus fault or Branch fault current?
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Device KA rating verification study
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Device KA rating verification studyDevice KA rating verification study(OP)
Device KA rating verification study should be done based on bus fault or Branch fault current?
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RE: Device KA rating verification study
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Device KA rating verification study
For a liberally designed (sized) system, it is a good engineering practice to use the bus fault current. This would be a conservative approach.
Some smart guys may argue other way around. There is no harm using the branch fault current.
However, while performing the relay coordination, you should take the appropriate branch currents.
RE: Device KA rating verification study
You should use the fault current that is present either at the overcurrent device, or on an upstream bus if you want to be conservative.
RE: Device KA rating verification study
But in a multi-sourced, networked system then you have to look at what the maximum is from each side and base your choice on that. For instance, if you consider a generator breaker; it needs to interrupt the system contribution for a generator fault or the generator contribution for a system fault, but it can't see the total fault current.
RE: Device KA rating verification study
RE: Device KA rating verification study
RE: Device KA rating verification study
I think using of branch fault current will be more appropriate in case of evaluation of devices. The branch fault current will be a pass through current passing through the respective devices in case of Fault. The devices 'KA' rating, can be compared with the branch fault current & devices can be evaluated.
regards,
Tushar Borole
RE: Device KA rating verification study
Can anyone elaborate more on this topic with the help of attached single line diagram.
If we want to evaluate KA rating for PD-3, then which fault current should be considered, the one appearing at the bus PANEL or the fault current going through the branch i.e. CBL-4?
RE: Device KA rating verification study
RE: Device KA rating verification study
Branch fault would be most appropriate, I would think. The current produced can be compared with the ratings of the devices and the protective device settings modified accordingly.
-Glenn
RE: Device KA rating verification study
RE: Device KA rating verification study
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RE: Device KA rating verification study
RE: Device KA rating verification study
So, that means bus fault KA value should be considered for all its outgoing feeder breakers?
Please advice.
RE: Device KA rating verification study
RE: Device KA rating verification study
RE: Device KA rating verification study
RE: Device KA rating verification study