RE: [PHISH] RE: Re: Oil Dielectric Properties

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Anthony R. Mollner" <penny831@xxxxxxxxxxxxx>

The down side of castor oil is how much more it costs than transformer oil.
At least when I was looking into it about seven years ago.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sunday, April 15, 2007 2:47 PM
To: tesla@xxxxxxxxxx
Subject: [PHISH] RE: Re: Oil Dielectric Properties


Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 09:47 PM 4/14/2007, Tesla list wrote:
>Original poster: "Anthony R. Mollner" <penny831@xxxxxxxxxxxxx>
>
>Now that's a capacitor! I would like to see a chart on the direct
dielectric
>properties of oils to find what kind of spacing would be best.

Which properties are you interested in... google and find a Shell
Diala AX data sheet
Breakdown strength varies with contaminants, but is quite high (150-200
kV/cm)
Epsilon varies with the kind of oil, but 2 or 3 is typical for
"transformer oil" and 5-6 for "castor oil" (which is why castor oil
is used in some pulse caps...)

http://home.earthlink.net/~jimlux/hv/insulliq.htm

>  Anyone have a
>dielectric chat that they can post for me? What did you use for spacers I
>wonder since plastics are a better dielectric than oils in the first place?
>Tony
>
>-----Original Message-----
>From: Tesla list [mailto:tesla@xxxxxxxxxx]
>Sent: Saturday, April 14, 2007 7:21 PM
>To: tesla@xxxxxxxxxx
>Subject: Re: Oil Dielectric Properties
>
>
>Original poster: gary350@xxxxxxxxxxxxx
>
>I built a cap using metal plates and a fish aquarium.  Cut all the
>plates the same size let plates 1,3,5,7,9,etc hang over one side
>about 1/4" let plates 2,4,6,8,10 hang over the opposite side connect
>the edges together with a soldered wire.  A spacer is needed between
>all of the plates.  The spacer is the number one problem because it
>becomes part of the dielectric.  I tried all sorts of things
>polyurethane 1/8" thick worked the best for me. I tried several
>different oils, Caster oil, mineral oil, 100% paraffin oil, 10 weight
>hydraulic oil, High Voltage oil, BBQ grill lighter fluid.  All of the
>oils seems to work fine.  This cap is 99.9999% bullet proof and 100%
>repairable.  The only problem I ever had was getting an arc along one
>of the spacers and causing a carbon track on the spacer.  The spacer
>was replaced and the cap worked fine again. Cap is quick and easy to
>build.  Disadvantage is it is large and bulky.
>
>
>
>
>-----Original Message-----
>  >From: Tesla list <tesla@xxxxxxxxxx>
>  >Sent: Apr 12, 2007 9:38 PM
>  >To: tesla@xxxxxxxxxx
>  >Subject: Oil Dielectric Properties
>  >
>  >Original poster: "Breneman, Chris" <brenemanc@xxxxxxxxxxxxxx>
>  >
>  >Hello,
>  >
>  >I was once again considering possible unique methods of homemade tank
>  >capacitor construction, and came up with this idea:
>  >In a jar, or some other kind of uniform container with an open top,
>  >place a plate of metal at the bottom.  Glue the plate of fasten it to
>  >the bottom by some means.  Then add a layer of salt to the desired
>  >dielectric thickness.  Then add another metal plate cut so that the
>  >lead is on the opposite side of the container (of course the leads on
>  >alternating plates alternate) and glue or fasten it to the side of
>  >the container.  Then repeat with the salt and plates until the
>  >container is filled.  Metal plates should have some kind of opening
>  >in them, either a drilled hole or a space left for the opposite leads
>  >on the sides of the container.  After this is done, the plates should
>  >be stationary and fixed to the sides of the container.  The salt
>  >could be poured out or dissolved with water, and the container could
>  >be filled with a liquid dielectric, such as oil.  Such a capacitor
>  >would be self-healing, always a useful trait.
>  >Anyway, I was wondering what the dielectric properties of various
>  >kinds of oil are at high frequencies to determine whether a capacitor
>  >constructed in such a way would be feasible for Tesla coil
>  >use.  Also, if anyone sees any general design problems with this,
>  >suggestions are of course welcome.
>  >
>  >Thanks,
>  >Chris
>  >
>  >
>