Cheers for that. This is what I'm trying to runI suppose that depends on what you are planning to do? If you are putting a transformer between an RPC and a machine, I would suggest a transformer at about 2x the largest motor you intend to run. For example if you are going to power a 5 HP motor, that is about 4kW. So go for a transformer rated to at least 8kVa.
What type?? Nothing special here - assuming you are looking at a straight forward 3 phase transformer?? You probably want one of those small, dry type, air cooled boxes (sits in the corner and humms).
You want kva.I've tried looking everywhere for this type of dry transformer to these specs but am confused as hell. Am I after a 7.5kw or 7.5kva?http://www.kayind.com/sites/default/files/pdf_library/Step_up_connection_diagram.pdf
This what I'm trying to achieve, I have all but the transformer. Is there a site that specialises in these transformers?
It work fine as long as you did not forget that your neutral on the output side would be the middle of one of the legs.The transformer in the the RPC drawing is an isolation transformer. I'm not sure if an auto transformer would work with a RPC