Re: [TCML] pole pig ballasting

["garry neeley" <bamacoiler@xxxxxxxxx>]

It is not a 3 phase transformer.  IT looks just like a regular pole pig but
quite large.  I was mistaken when I said that it had a 240v secondary.  It
has a 480v secondary and a 12470v primary.  It came from a pole here at
work, a bank of 3 single phase 50kva transformers to provide 3 phase 480v
service.  So to solve my problem i got a 10kva 240 in 480v out step up to
feed the pig 480 so I can get the 12470v out.  I know exactly what a 3 phase
transformer is.  Schematic from the pig shows 2 windings 12470 in and 480
out.

On Fri, Jul 18, 2008 at 5:19 AM, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:

> Most folks are assuming this is a single phase transformer. We have lotsa
> 12,470 to 480 transformers at work, but they are three phase. Do you know
> what three phase is? Is there a schematic that you can take a photo of and
> post somewhere? How many HV and LV bushings are there?
>
> Adam
>
> --- On Thu, 7/17/08, David Rieben <drieben@xxxxxxxxxxx> wrote:
>
> > From: David Rieben <drieben@xxxxxxxxxxx>
> > Subject: Re: [TCML] pole pig ballasting
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Thursday, July 17, 2008, 7:15 PM
>  > Hi Garry, Aaron,
> >
> > Aaron is correct. 7200/12470Y volt rating is a much
> > more common primary voltage rating than just 12,470
> > volts. However, if "12470" IS the only thing
> > stamped
> > on the nomenclature tag, then it is rated at12,470 volts.
> > BTW, if the low voltage side is rated at 277 volts, run-
> > ning 240 volts through a 240/280 volt variac will give
> > you the option of up to 280 volts input from a standard
> > 240 volt service, which will put you just about right on
> > the nameplate rating target for the high voltage output ;^)
> >
> > --
> > David Rieben
> >
> > -------------- Original message --------------
> > From: jaholmes@xxxxxxxxxxxxxxxxxx
> >
> > > If "7200" is nowhere on the nameplate, it
> > probably is 12470V. That is very
> > > uncommon, but not unheard of. 7200/12470Y is, on the
> > other hand, very common,
> > > and just means 7200V. So if all you see is
> > "12470", you can be happy :-)
> > >
> > > 7200V would not be the end of the world by itself (it
> > does present some solid
> > > challenges in spark gap design as David mentioned),
> > but with the 277V secondary
> > > you would only be able to expect about ~6kV out with
> > residential 240V service.
> > > Another kV off the already-low 7200V would be a major
> > bummer.
> > >
> > > Anyway, if you have any questions about the nameplate
> > data just post them here
> > > and those pig-wranglers among us will be happy to try
> > and disambiguate anything.
> > >
> > > Cheers,
> > > Aaron, N7OE
> > >
> > > --- On Thu, 7/17/08, garry neeley wrote:
> > >
> > > > From: garry neeley
> > > > Subject: Re: [TCML] pole pig ballasting
> > > > To: "Tesla Coil Mailing List"
> > > > Date: Thursday, July 17, 2008, 11:36 AM
> > > > I hope it isn't 7200v. I haven't tested
> > it yet.
> > > > The nameplate says primary
> > > > volts 12470, secondary 277/480y. So what is it
> > guys 7200
> > > > or 12470?
> > > >
> > >
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>
>
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