Does anyone make a transformer with a 400 volt secondary? Or can I get a custom wound transformer to provide this voltage? ....
How about 416V? ... A -2.5% tap will take the output down to 406V ...
They ask for a 2% tolerance, and the utility is normally off by a little, so I don't think that quite gets me there. ... .
Following others comments: Using precise engineering definitions - You're screwed.
I've never seen a utility guaranteeing 2%. And, I doubt the full load - no load regulation on a normal transformer will even meet 2%. You can likely order a special design xfm that will get the regulation to less than 2% - the mfg will sell you a 750VFA with a 300KVA nameplate. Of course the inrush will be a killer - and that doesn't fix the utility normal +-5%
I'll be curious to the customers reaction when you give them the price for a system that will hold 2% come hell high water, or hurricane, and hold up to the utility normal fluctuations
I'm guessing they won't be quite so stuck on 2%. Then again, maybe it is a piece of medical lab equipment and the response is, "Yep - that's what we figured."
good luck
ice