Transformers, pole

Hello again,

I have found a contact at my local utility company that is trying to find a
transformer for me.  I asked for a 5kva, two bushing, 14,400 v input with
240/120 v out.  He has found a 7,620v transformer.  I would think I could use
this by applying 240v AC to one of the 120 volt windings and getting 15kv
out.  Does anyone see a problem with this?  What would I do with the other
120v winding - leave it floating?

Thanks,  Ed Sonderman