Dave,
If you parallel two of the three primary windings fed with 240V single
phase, and series the two corresponding secondary windings, I believe you
would get about 4376V, 8kVA (4kVA per coil). This assumes two primary legs
are actually 180 degrees out of phase.
Jim Smith,
KQ6UV
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of DAVE WHITE
> Sent: Monday, November 17, 2008 7:50 AM
> To: amps@contesting.com
> Cc: pennyanddavid@btinternet.com
> Subject: [Amps] 3 phase transformers on single phase - advice pls?
>
> Guys
>
> 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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