Re: [TCML] Brand new 34.5kV 10kVA pig for $300 in PA

["DC Cox" <resonance@xxxxxxxxxxxx>]

Unfortunately, the 46 kV level is only good if you have a 440 VAC driver
potential.  None of them go from 220 to 46 kV.  Intermediate xmfr is
required.  You can go to 19.9 kV from a 220 VAC, but usually 440 VAC is
required to go higher.  Lots of weight to haul around as the bushings get
huge and most are oil-filled bushings.  I have a 69 kV potential xmfr with a
120 VAC secondary.  The bushings are 4 feet long, oil filled, and the xmfr
weighs in at 850 lbs!

This company used to be REA and even before that, in the 1940's,
Allis-Chalmers.  Allis-Chalmers made some monsterous 1 megaVolt transformers
and also the huge 600 kV 1 Amp DC system used at Oak Ridge, TN, during the
atomic bomb development.

Dr. Resonance

On Tue, Jun 3, 2008 at 1:48 PM, <jaholmes@xxxxxxxxxxxxxxxxxx> wrote:

> The following datasheet from Cooper makes for interesting reading:
> http://www.cooperpower.com/library/pdf/20110.pdf
>
> Besides implying that they make pole pigs all the way up to 46kV
> (Yeeeowww!!), it highlights the relationship between the primary voltage and
> BIL ratings and the size of the pig can (and presumably the internals).
>  There is a very strong correlation; the higher the voltage and particularly
> the BIL, the larger the can.  Doubling the BIL just about doubles the volume
> of the can!
>
> Incidentally, said pig finally showed up:
> http://silicon-arcana.com/remote_pics/34_5kV_pig/new_pig_full.jpg
>
> At some point soon, I'll open the can and take a few pics of the guts.
>
> Cheers,
> Aaron, N7OE
>
> --- On Sat, 5/10/08, David Rieben <drieben@xxxxxxxxxxx> wrote:
>
> > From: David Rieben <drieben@xxxxxxxxxxx>
> > Subject: Re: [TCML] Brand new 34.5kV 10kVA pig for $300 in PA
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Date: Saturday, May 10, 2008, 11:49 AM
> > Aaron,
> >
> > > If you look at the core and coil weights, it's
> > pretty
> > > clear that much of the 700 lbs is in the oil volume.
> > > This, I'm assuming, is because a 34.5kV pig
> > requires a
> > > lot more clearance between things inside the can.
> >
> > My 150 kVp, .6 amp x-ray tranformer that I drive that
> > big Jacob's ladder with only weighs in the est. 500 to
> > 600
> > lbs. range (my scales only go to 350 lbs.). I noticed that
> > just the dry core/coil assembly of the said pig weighs
> > 299 lbs. according to the nomenclature tag. That's
> > still a bit more than the average 250 to 275 lbs. for
> > an average 10 kVA - core/coil assembly, tank, oil and all!
>
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