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

[Jim Smith]

I should also clarify that this is only if the rated primary voltage is
380V, not 415V.

Jim Smith,
KQ6UV

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Jim Smith
> Sent: Wednesday, November 19, 2008 10:27 PM
> To: amps at contesting.com
> Subject: Re: [Amps] 3 phase transformers on single phase - advice pls?
> 
> 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 at contesting.com [mailto:amps-bounces at contesting.com]
> On
> > Behalf Of DAVE WHITE
> > Sent: Monday, November 17, 2008 7:50 AM
> > To: amps at contesting.com
> > Cc: pennyanddavid at 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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