Re: Potential Transformer on Ebay- Heads Up.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "PotLuck by way of Terry Fritz <twftesla-at-qwest-dot-net>" <potluck-at-xmission-dot-com>

To All,

Yes, my mistake. It's 104 ma.

In the meantime I recieved two very informative private Emails that I feel
should be shared with the others.
Thank you both for taking your time to reply. Much appreciated !!!!

The first is from Bert Pool.


I wouldn't dismiss this transformer out-of-hand.  They are tough as hell!
To see what can be done with a 1.5 kva potential transformer, see my photo:
http://hot-streamer-dot-com/pool/GARAGE~1.JPG
Admittedly, I'm pushing it a bit beyond 1.5 kva, but it never complained,
and I still use it today.

Bert




The second is from Scott Hanson.

Rick -

Your math is defective.

Divide the VA rating (1500) by the voltage(14400) to determine the current
(.104 A).

Actually, these transformers can be run at 2X their VA ratings for short
periods of time; 200 ma -at- 14400 volts will power a medium-sized coil nicely.

However, the big drawback is the need to provide some form of current
limiting. Unlike NST's, PT's are not magnetically shunted, and will attempt
to draw hundreds of amps from the LV input side when current is drawn from
the HV side. The usual setup is to use TWO 25 or 30 amp variacs, one as a
series inductor to limit current, one as a variable transformer to control
voltage. This ends up as a very large, heavy (hundreds of pounds) and
expensive system.

I have seen de-potted and de-shunted 60 ma NST's put out 180 ma, running in
free air. They run extremely hot, but only weigh 15 pounds of so and are a
tiny fraction of the size of a PT. Running a de-potted/de-shunted NST under
oil should give very reasonable reliability.

Scott Hanson





----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, May 25, 2002 10:20 PM
Subject: Re: Potential Transformer on Ebay- Heads Up.


> Original poster: "PotLuck by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<potluck-at-xmission-dot-com>
>
> Hi Vince,
>
> Thanks for the heads-up.
>
> I'm not very knowledgable with this type of transformer but it seems that
> 1.5Kva would be a bit low for tesla projects. It works out to an output of
> only about 10ma at 14400.
>
> The ID plate shows it as a type JVW-5
>
> http://www.geindustrial-dot-com/pm/products/transfrm/outvolt.pdf
>
> Rick W.
> Salt Lake City
>
>
>
>
>
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Saturday, May 25, 2002 9:36 AM
> Subject: Potential Transformer on Ebay- Heads Up.
>
>
> > Original poster: "Vince D'Amore by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla-at-teslafx-dot-com>
> >
> > Hello People.
> >
> > I don't see these much on Ebay and thought I would give everyone a heads
> up.
> >
> > http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=1734611044
> >
> >
> > Vince
> >
> >
> >
> >
>
>
>
>