Highest rating for 11kV switchboard.
Highest rating for 11kV switchboard.
(OP)
Hi-
I am looking for a switchboard produced after IEC62271-200 for an 50Hz - 11kV offshore installation.
General limit for most vendors seem to be 4000A nominal and 50/125kA short-circuit.
Does anyone know a vendor with higher values on one or both parameters which has a reference list for offshore projects?
Best regards
Preben Jakobsen
I am looking for a switchboard produced after IEC62271-200 for an 50Hz - 11kV offshore installation.
General limit for most vendors seem to be 4000A nominal and 50/125kA short-circuit.
Does anyone know a vendor with higher values on one or both parameters which has a reference list for offshore projects?
Best regards
Preben Jakobsen






RE: Highest rating for 11kV switchboard.
RE: Highest rating for 11kV switchboard.
What's the application? You're looking for unusually high ratings - is it time to consider a jump to the next voltage band, or splitting the board into two? In an offshore application with on-board generation be very careful if you're using distribution-class VCBs in generator applications because they can't handle the severe breaking conditions caused by the high X/R ratio and long time to first current zero. The interruptors burn away due to the persistent arc, then fail.
RE: Highest rating for 11kV switchboard.
I am in the early phase of a platform design and is on the limit of the 76 MVA that is a result of 11 kV and 4000 A. And when the project develops the load normally increases.
I would like to keep 11 kV and connect the generators directly to the main SWBD and I also would like to have all generators on same SWBD as it gives me flexibility: In the early phase when the load is high it will be easyer to maintain generators and in the later phase when load might decrease I am able to run only the required no. of generators.
I am aware that i can't assume the standard T=45ms and that I can't utilize the full rating of the SWBDs. In the current design i have included Is limmiters.
Right now I have a compact and light design which is important offshore. If i know it is possible to have 5000A it gives me pease in mind.
Datasheets for PIX-H gives that value (with fan cooling).
Best regards
Preben Jakobsen
RE: Highest rating for 11kV switchboard.
I admit that I'm slightly biased against some of the old Areva designs - which now a Schneider badge - because the quality control hasn't always been as good as it could be. I don't have specific experience of the PIX range, so it might be better than the stuff I have worked with.
RE: Highest rating for 11kV switchboard.
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RE: Highest rating for 11kV switchboard.