Re: 25 kV PT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

They came from an HP project, where the switchgear
heaters had failed. Moisture had caused visible corona
damage and some flashovers to much of the gear. The
PT's (or VT's as switchgear folks call them) had some
discoloration at the bushings due to corona. It
cleaned up quite nicely and both units hipotted fine.
HP wanted new ones, so I got their garbage. The things
are beasts; weighing 125 pounds each. Quite a lot for
something rated only 1.5 kVA; the same as a
blow-drier!

The label shows them to be manufactured by Instrument
Transformers, Inc., but the model number PT6-2-125-253
corresponds to the GE product literature found here:

http://geindustrial.com/products/specs/pt62125.pdf

I run my GE JVN-5 14.4 kV PT with one leg grounded,
and haven't had any problems.

Adam

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

> Original poster: "David Rieben"
> <drieben@xxxxxxxxxxxxxxx>
>
> Hi Adam,
>
> Wow, where did you score those beauties? It seems
> that
> really high voltage PTs are pretty hard to find. AS
> far as
> youre question, I think that you'll be fine by
> grounding one
> leg of the HV output of thise PTs. I've done it with
> 7.2 kV
> PTs before without a hitch. I've even grounded one
> end of
> one of them and "piggy-backed" the second one in
> series,
> although I wouldn't recommend running them in this
> fashion
> for extended periods.
>
> David Rieben
>
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <Tesla@xxxxxxxxxx>
> Sent: Wednesday, January 31, 2007 12:00 AM
> 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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