Re: 25 kV PT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr.Hankenstein" <Dr.Hankenstein@xxxxxxxxxxxxx>

Neither H1 or H2 may necessarily be closer to ground. Let me explain:

When one winds a transformer, the begining of the winding is refered to as
"start". When you are done, that's the "finish". While the transformer is
being tested, such as with a TTR set (transformer turns ratio test set) the
polarity marks are commonly refered to as "start and finish" and the test
set's connections are called "polarity and non-polarity", not H1, H2 to X1,
X2, etc.

Now, with the above in mind, a normal "pole" transformer would have the H2
connected to the "start" of the winding, and the H1 connected to the end or
"finish" of the winding. Being that the "finish" or H1 is furthest away
from the core, you really don't want to ground that end! The "finish" is
only called "H1" for connection's sake, and it is an industry standard so
even a Lineman Apprentice can properly hook-up and phase in a transformer
bank,... just by looking at the pictures. (No offense to the Linemen out
there, because if it wasn't for the pictures, I probably couln't do it
either.

If you still confused, use a single-bushing transformer. Then there's
absolutely no doubt which end is grounded!


> [Original Message]
> From: Tesla list <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Date: 2/2/2007 11:30:18 PM
> Subject: Re: 25 kV PT
>
> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Adam,
>
> It's probably wise to check with the manufacturer of the pole
> transformer to verify H1 and H2. Common sense says H1 is near the
> core (but again, check it out first). Here's a document which may be
> of some help.
> http://www.classictesla.com/download/TransfPol.pdf
>
> I run my pig with H1 grounded at RF ground. No problems for myself.
>
> Take care,
> Bart
>
>
>
> Tesla list wrote:
>
> >Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> >
> >I felt like it should work as well. That's the way I
> >run my 4" coil, with one side grounded. However, I
> >seem to recall a post where someone stated that their
> >14.4 PT got fried by connecting the "wrong" leg to the
> >core. I've got lotsa literature on phasing, but
> >nothing that would indicate which side of the HV
> >windings would be closest to the core (H1 vs. H2).
> >
> >I also seem to recall a more recent thread, discussing
> >which side of a pig to ground. I can't find it now. I
> >think Dr. Resonance may have had an opinion or facts
> >on this.
> >
> >Adam
> >
> >--- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > > Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
> > >
> > > Hi Adam,
> > >
> > > Where did you find these gems? I have 1 14440/5KVA
> > > Ge and would love to find
> > > another to series. I can't imagine why that wouldn't
> > > work especially with a
> > > 125KV bil rating.
> > > Jim Mora
> > >
> > > -----Original Message-----
> > > From: Tesla list [mailto:tesla@xxxxxxxxxx]
> > > Sent: Tuesday, January 30, 2007 10:01 PM
> > > To: Tesla@xxxxxxxxxx
> > > Subject: 25 kV PT
> > >
> > > Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> > >
> > > I have 2 25 kV PT's like these:
> > >
> > > http://geindustrial.com/products/specs/pt62125.pdf
> > >
> > > Has anyone ever grounded one leg of a PT before? I
> > > know lots of folks have done this with their pigs
> > > (myself included). I'd like to run them in series
> > > for
> > > 50 kV out, but would hate to kill them.
> > >
> > > thanks
> > > Adam
> > >
> > >
> > >
> > >
>
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