Using a 3 phase transformer to supply power for a single phase device.

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jchretien68

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Orion, Michigan, USA
I have a load (robot controller) that requires 1.5KVA at 208V, single phase. I plan to use a 3 phase 480V Delta to 208Y transformer to feed it. I would connect my load across two phase on the secondary of the transformer.
My problem is to size the transformer. It is obviously not a balanced system and I am getting lost in trying to figure out what size I should get. I usually deal with 24VDC and this problem is out of my league. Could anybody advice me on how to size of the transformer?
Thanks
 
First off, why are you even thinking of using a three phase transformer when you will have only a single phase load?
That will not give you any better balanced load on your primary than using a single phase transformer with its primary wired line to line (or even line to neutral if you have a wye service.)
 
I have 480V 3 phase from my load panel and I thought of using a standard transformer (480V Delta / 208Y/120) to give me the 208V that I am looking for. I could not find a standard single phase transformer ( 480V / 208V). Do you know of any ?
 
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