Re: Paper/Oil Capacitors

["Steve" <Steve-at-g8cyerichmond.freeserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

I've been looking through some of my old books to try and find out what used
to be used in the old days. Unfortunately I haven't found what I was looking
for, but if memory serves me correctly, castor oil was commonly used rather
than mineral oil. In fact I have an oil.and paper cap that is at least fifty
years old, and it still works, and its value is pretty well what it says on
the label. Unfrotunately it is part of an old induction coil, and I don't
want to dismantle it to check out what's inside. I would also like to find
out about the electrical properties of castor oil, if anyone can help, I
rather fancy the idea of trying it myself.
Steve
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, August 24, 2000 6:28 PM
Subject: Re: Paper/Oil Capacitors


> Original poster: "Duke, Ronn (CCI-San Diego CCC)" <Ron.Duke-at-cox-dot-com>
>
> >>Snip <<
> >>I thought it would be a good idea to make a rolled poly cap with
> paper-poly-paper layers. I figure >>this would help keep the heat and
corona
> away from the poly that would prompt premature failure, >>and also improve
> the voltage rating and dielectric properties.
>
> >> Reply Snip <<
> >your idea of using paper, poly, paper is a very good one. I wish I would
> >have thought of it a year ago.
> >One thing though, wood pulp dissolves in oil after a time. that is why
> >you use paper towels to clean the inside of an engine block before
> >rebuilding, not a rag.
> >but when I was in drafting at V.O. Tech (back before cad), we used a lot
> >of velum, I'm not sure what it was made out of but it seemed to be some
> >kind of impregnated paper?
>
> I wouldn't be surprised that wood doesn't last long in motor oil.
Petroleum
> based oils you add detergents, ashless dipersants,(keeps carbon particles
in
> suspension), anti-foaming agents, acid neutralizers, flash suppression
> agents, etc.  You get the picture. I would think that paper would fare
much
> better in pure mineral oil or transformer oil because of lack of chemical
> additives.
>
> Comments?
>
>
> Thank you,
>
> Ronn Duke
> Cox  Communications
> Customer  Care  Center
> Ex. 3485
>
>
>
>