Overcurrent Coordination Setting Guidelines Generators
Overcurrent Coordination Setting Guidelines Generators
(OP)
I am working on a project where I think that the breaker after the generator is undersized. SKM and other similar companies say to set the LTPU to 115-125% FLA of the generator. I have gone through the IEEE Buff Book, IEEE C37.102, and IEEE C37.13 for trying to reference this spec so that I can use it, but I have been unable to find where these numbers have come from. Is this a specific standard that I can find somewhere or is it a rule of thumb that is used industry wide?
My generator is 110kW, 1654 FLA, 480V, PF=0.8
The breaker in question has a 1600 amp plug.
Thanks for the help.
My generator is 110kW, 1654 FLA, 480V, PF=0.8
The breaker in question has a 1600 amp plug.
Thanks for the help.





RE: Overcurrent Coordination Setting Guidelines Generators
Could simply be that the cost difference between a 1600A breaker and a 2000A breaker wasn't worth it to somebody for the incremental generator capacity gained. It just means you can't fully load the generator.
RE: Overcurrent Coordination Setting Guidelines Generators
Matthews
RE: Overcurrent Coordination Setting Guidelines Generators
If this is a standby set, you are close to the engine limiting the power output.
If this is a standby set you are already in overload. I regions where "winter diesel" fuel is supplied in the winter months, you may not be able to get 1700 Amps at full voltage on winter fuel grades.
Yes the breaker seems undersized, but so is the gen-set.
Bill
--------------------
"Why not the best?"
Jimmy Carter