Re: Needed 240v to 480v Transformer.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> 

She often questions my sanity.....



Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Needed 240v to 480v Transformer.
>Date: Thu, 15 Jul 2004 12:08:12 -0600
>
>Original poster: "J. Aaron Holmes" <jaholmes-at-silicon-arcana-dot-com>
>
>If that were local to me, it would have been mine, but
>when you buy transformers off eBay, the shipping is
>often most of the final cost.  I almost bought a pole
>pig off eBay some time ago, but the shipping would
>have been around $200!  Nuts!  For a 5kVA pig!!
>Ultimately I found a local source, saved hundreds, and
>got a bigger unit.  If it were me, I'd still do a
>little looking at the 480V pig before resigning myself
>to having *two* big transformers on my coil.  Then
>again, there is something strangely addicting about
>collecting large objects that hum at 60Hz when fed
>power.   ...and that your spouse frequently questions
>your need for :)
>
>Aaron
>
>--- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Hydrogen18"
> > <hydrogen18-at-bellsouth-dot-net>
> >
> > I have seen 15 KVA units of this type go for as
> > little as $3.
> >
> > ---Eric
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Tuesday, July 13, 2004 4:50 PM
> > Subject: Re: Needed 240v to 480v Transformer.
> >
> >
> >  > Original poster: "J. Aaron Holmes"
> > <jaholmes-at-silicon-arcana-dot-com>
> >  >
> >  > 480V dry-type distribution transformers are
> > absolutely
> >  > everywhere on eBay.  Restrict the search to your
> >  > locality and you may even find one you can go
> > pick up
> >  > today!  ...but they're often expensive, often
> >  > three-phase, and often MUCH larger than 10kVA.
> >  >
> >  > However, there is a 10kVA unit on eBay right now:
> >  >
> >
>http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&category=42881&item=3827440387&rd=1
> >  >
> >  > ...but is your transformer LV side center-tapped?
> >  I
> >  > don't know about 480V pigs (that's what you have,
> >  > yes?), but most 240V pigs actually have two
> > separate
> >  > 120V windings that are placed in series to
> > achieve the
> >  > 240V (so "center-tapped" is not really
> > descriptive of
> >  > reality).  These can easily be reconfigured with
> > the
> >  > 120V windings in *parallel* to allow for a single
> > 120V
> >  > connection without derating the power.  The
> > nameplate
> >  > will generally show the different configurations
> > of
> >  > the LV leads if this is possible.  Even if you
> > just
> >  > have 480V output, you may take a look inside (if
> > you
> >  > haven't already) to see how the windings are
> >  > connected.  Perhaps you would still find two 240V
> >  > windings soldered together in series.  Even in
> > that
> >  > case, I'd prefer breaking the connection and
> > doing a
> >  > little of my own soldering to dealing with *two*
> > big
> >  > transformers at once!
> >  >
> >  > Regards,
> >  > Aaron
> >  >
> >  > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> >  >  > Original poster: "Paul Marshall"
> >  >  > <klugmann-at-hotmail-dot-com>
> >  >  >
> >  >  > I hve a new power transformer for my coil but
> > it has
> >  >  > a 480v Primary. Does
> >  >  > anyone on the list know where I can get a 240v
> > to
> >  >  > 480v power transformer. I
> >  >  > need at least 10kVA.
> >  >  >