RE: usable potential transformers? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 2 Jul 2007 11:39:18 -0700 (PDT)
From: J. Aaron Holmes <jaholmes@xxxxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: usable potential transformers? (fwd)

On Rich's comment:  A single-phase PT with a 208V
output would be extremely odd.  As Jim says below,
this is a three-phase "Y" or "wye" voltage.  On
nameplates where you see stuff like "120/208Y" or
"7200/12470Y", just pretend the second number is not
there.  For a TCer's purposes, it's almost always
totally meaningless, as it implies multiple
transformers and a three-phase power source.  I *have*
seen *control* transformers with 208V *input* before,
but in the realm of control transformers almost
anything goes :-)

On Jim's comment:  5kVA is a BIGGG PT!!  I've seen PTs
in cylindrical cans like pole pigs, but still only
3kVA or less.  I would love to see what your 5kVA unit
looks like!  Last month I picked up some older
Westinghouse 3kVA units in metal oil-filled cubes with
oil-filled bushings.  They weigh about 450lbs each,
making them heavier than my 15kVA pig!  But they do
*look* very, very sinister >:-))
"http://silicon-arcana.com/PTs/web_matt.jpg"; (person
in picture is fellow Seattle-area coiler Matt Stiger,
who provided the truck used to rescue these puppies
from the salvage yard)

Cheers,
Aaron, N7OE

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> 
> ---------- Forwarded message ----------
> Date: Sun, 1 Jul 2007 21:15:53 -0700
> From: Jim Mora <jmora@xxxxxxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: usable potential transformers? (fwd)
> 
> Hello Rich,
> 
> I have a industrial PT that is 120 or 240 but is
> 5KVA which is sorta unusual
> I believe. Most the ones I have seen on the net are
> 120v. 208v is likely
> from 3 phase wye?
> 
> Jim Mora  
> 
> 
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> Sent: Sunday, July 01, 2007 8:14 PM
> To: tesla@xxxxxxxxxx
> Subject: RE: usable potential transformers? (fwd)
> 
> 
> ---------- Forwarded message ----------
> Date: Sun, 1 Jul 2007 19:57:06 -0500
> From: Rich & DJ <rdj@xxxxxxxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: usable potential transformers? (fwd)
> 
> Are you sure it is not 208V input, that is a
> standard voltage for industrial
> transformers. My PT transformer is 208 input.
> Rich
> 
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> Sent: Sunday, July 01, 2007 12:16 PM
> To: tesla@xxxxxxxxxx
> Subject: RE: usable potential transformers? (fwd)
> 
> 
> ---------- Forwarded message ----------
> Date: Sun, 1 Jul 2007 09:37:21 -0700 (PDT)
> From: J. Aaron Holmes <jaholmes@xxxxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: RE: usable potential transformers? (fwd)
> 
> Yeah, hard to read.  I think the VA is 1750.  At
> least, I can't think of what else that number would
> represent...
> 
> Aaron, N7OE
> 
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
> 
> > 
> > ---------- Forwarded message ----------
> > Date: Sun, 1 Jul 2007 09:03:52 -0700
> > From: Jim Mora <jmora@xxxxxxxxxxx>
> > To: 'Tesla list' <tesla@xxxxxxxxxx>
> > Subject: RE: usable potential transformers? (fwd)
> > 
> > Hi All,
> > 
> > Yes, I was looking at (1) of these, though $'s are
> > tight now. I have put in
> > a request to the seller find out the VA rating
> since
> > the plate is
> > unreadable. I am assuming (always dangerous) that
> > the Pot xformer is
> > removable from the apparent stand. It would be
> nice
> > to go up to this voltage
> > but quenching even on a 17" rotor, may become an
> > issue??
> > 
> > Thoughts?
> > 
> > Long arcs,
> > Jim Mora
> >  
> > 
> > -----Original Message-----
> > From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> > Sent: Sunday, July 01, 2007 7:01 AM
> > To: tesla@xxxxxxxxxx
> > Subject: usable potential transformers? (fwd)
> > 
> > 
> > ---------- Forwarded message ----------
> > Date: Sun, 01 Jul 2007 08:41:00 -0400
> > From: Dave Goodfellow <dgoodfelo@xxxxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: usable potential transformers?
> > 
> > On ebay now Item number: 220125509946
> > Looks like 25000 to 120, but it is hard to see the
> > plate.
> > 
> > Dave Goodfellow
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>