[Amps] 3 phase transformers on single phase - advice pls?

[Keith E. Spainhour]

Hello,
This question could not have come at a better time. I am currently trying to 
do the same thing with a plasma cutter I purchased this weekend. It turns 
out the unit I thought was 220v single phase was actually 460v 3 phase. The 
transformers are the same 3 bobbin type. I found this page that explains 
some of it, but I am still trying to find the best way to run these 
transformers from 220v single phase.

http://www.basler.com/downloads/3phXfmrs.pdf

Take Care,
Keith Spainhour, KT4XW


> I'm sure I should know the answer to this, but just can't seem to find 
> anything in my literature or on the web. A friend (G7ODR, cc'd on this 
> email) and I have scratched our heads, but the more we discuss the 
> problem, the more complex it becomes.....
>
> If I use a 3 phase transformer (either a 380v or 415v primary) on a 240v 
> single phase power supply, then what will happen in the secondaries?
>
> I think the transformers that I have access to are delta input and star 
> output. They're open 3-bobbin jobs rather than potted or enclosed.
>
> Can I wind the secondaries in series without overloading the insulation?
> Could I wind them in parallel? Would I hit core saturation problems?
>
> So, to put a few figures on it, if it's a 12kva 3 phase 380v in, 6kv out, 
> what would happen with the various permutations if I try to wire it onto 
> 240v single phase?
>
> I'm actually looking for 4.5kv RMS out at 10kva and can get a single phase 
> one custom wound, but at a price (£950 from TEC). Anyone in the UK know of 
> a cheaper but quality source?
>
> Phone a friend, ask the audience etc.... ;-)
>
> Any ideas appreciated.
>
> cheers
>
> Dave G0OIL / K2MOO
>
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