Re: new power transformer

To: tesla-at-pupman-dot-com
Subject: Re: new power transformer
From: Clay Wilson <gasman-at-althea.a-line-dot-net> (by way of terryf-at-verinet-dot-com)
Date: Wed, 26 Aug 1998 19:09:28 -0600
Approved: terryf-at-verinet-dot-com

X-Envelope-From: gasman-at-althea.a-line-dot-net  Wed Aug 26 16:05:30 1998

> > Hi All,
> >
> >   For the last 6 months or so I have been running my 3KW magnifier system
> > with and output varying from 4-6 feet.  The problem is form marathon runs
> > my power transformers overheat and start smoking after 30 min.  They are
> > two 5 KV 300 ma transformers put in series.
> >     I am ready to upgrade these to a potential transformer or a 5 kva pig.
> > My question is are the potential transformers current limited cores? or do
> > these also need ballasting to work.
> >     The reason for leaning more for the potential transformer is that I
> > like to keep the system portable and not everywhere I take it has 220
> > available to me.  Also the pigs tend to be very heavy and hard to put on a
> > truck.
> >     Could anyone give me advise either way.
> >
> > Thanks,
> >
> > Dwight Duncan
> 
> A lightweight potential Xfrmer might be about 100 lbs.  They are never
current
> limited like a NST and much be ballasted.
> 
> Richard Hull, TCBOR



	Dwight, if you are interested in a higher voltage, higher power xfmr
which *does* have the internal current limiting, you should look at William
Wysock's page at www.ttr-dot-com, under 'misc components.'  He has two dry-type
xfmrs, 20 kV 2kVA, with these.  They are a bit high ($280 each) - but they
have some pros, as well - like you don't have to worry about buying a bunch of
heating elements and building a big inductor (or kludging an old arcwelder!).
I found a real nice pig: rated 20.9 kV and 10 kVA - on the 280v outs on my 
variac, it should be good for over 24 kV out and do maybe 20 or 30 kVA for 
short spurts anyway.  For this pig, I had to give $250 bucks, plus $75 
shipping - and now I have to screw with ballasting it.  And I looked for a 
while before I found it.

	So, you see, the choice is kinda hard.