Re: Oil Caps

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Mike

You are lucky to have these cap. If my calculation are good for a
.015 uF a dielectric thickness of 1/4" assuming that the oil
relative permittivity is 2 you need 58 square feet of surface for
one plate that make a cap of more than a cubic foot. May be
"gigantic" is a little bite to mush ;-))

Oil cap have some good feature when well build like self healing.
I read that in high frequency wave could be disturbed by
convection occurring in the oil????

Cheers,

Luc Benard 
Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Hollmike-at-aol-dot-com>
> 
> Actually they are not all that big.  I have a plate-in-oil cap with stiff
> aluminum plates with about a quarter inch separation.  It is not something
> terribly convenient to cart around, but it has .005uF capacitance and I can
> only imagine about 25kVAC (more?) voltage rating.   I also have a second one
> that has several caps within the tank and if combine in parallel, has .015uF
> with, the same voltage rating.  One or both of these were used with a 22kV
> transformer of about 10kVA(only guessing here - haven't attempted to
determine
> the actual rating.
> Mike
> 
> >
> > Hi Jeff,
> >
> > If the caps is the only thing missing for running your coil try
> > salt water cap really cheap to build Geek have good plan on there
> > site. Oil cap could be interesting but you will need a gigantic
> > one not easy to build and messy. Many of us used salt water cap
> > before they are lousy but easy to build cheap and relable. See
> > this link.