Re: Needed 240v to 480v Transformer.

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

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.
 >  >
 >  > Thanks,
 >  >
 >  >
 >  >
 >  > Paul S. Marshall
 >  >
 >  > _