RE: Re: Oil Dielectric Properties

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: gary350@xxxxxxxxxxxxx 

I used 1/8 inch spacing between the plates.

I first tried this with glass between the metal plates loses were 
very high probably 75%.  My glass plates were 8" wider than the metal 
plates that gave me 4" of glass hanging over the edge of each metal 
plate and sparks would sometimes jump round the edge of the 
glass.  In the dark I could see the glass would glow BLUE and after 
about 3 minutes of running the TC the glass would over heat and 
break. I soon learned I could not run the TC more than about 90 
seconds then give it about 2 hours to cool then I could run it 
another 90 seconds.  Glass is not good.



>Subject: 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
>>  >
>>  >
>>
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