A little help with 45kva buck boost transformer.....

[fastjer]

Hello all! I have a 45kva GE transformer in the pics https://www.facebook.com/photo?fbid=10218414252692170&set=pcb.10218414261612393 and https://www.facebook.com/photo?fbid=10218414252972177&set=pcb.10218414261612393 here. Its set up for 480 to 208, i need to wire it for 250v to 208v. When I hook it up to the 3 phase coming into my shop (248v) I get 116v at tap 7 across the secondary outputs. or 56v to neutral. Can anyone send me in the right direction? The old timer electrical engineer that works next door is about 90% sure how to do it, but he hasn't done one like this in a long time. I'm using this to buck the voltage from 250 at the plug to 208 for some tile kilns.
Thank you!

 

[Little Bill]

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