Re: [TCML] pole pig ballasting

[jaholmes@xxxxxxxxxxxxxxxxxx]

Yes, but 50kVA is not a three-phase kVA rating, and he mentioned three transformers getting replaced, so single-phase is a pretty sure bet.  If it were 45kVA, on the other hand...

Cheers,
Aaron, N7OE

--- On Fri, 7/18/08, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:

> From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> Subject: Re: [TCML] pole pig ballasting
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Friday, July 18, 2008, 3:19 AM
> 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? 
> > > > 
> > > 
> > > _______________________________________________ 
> > > Tesla mailing list 
> > > Tesla@xxxxxxxxxxxxxx 
> > > http://www.pupman.com/mailman/listinfo/tesla 
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> 
> 
>       
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla