Re: capacitor building info

To: tesla-at-pupman-dot-com
Subject: Re: capacitor building info
From: Tesla List <mod1-at-pupman-dot-com>
Date: Wed, 1 Oct 1997 20:09:00 -0600 (MDT)
Approved: mod1-at-poodle.pupman-dot-com


---------- Forwarded message ----------
Date: Wed, 1 Oct 1997 17:14:03 -0500
From: "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: capacitor building info 

To: Gwyn

As you probably noted this ultra-thin material is almost impossible to
handle with human hands without getting a lot of crinkles in the foil, etc.
 You may have to set up some type of lathe with a few jigs or hold the foil
and dielectric material.  I noted the Maxwell uses large springs to tension
their spools of foil and dielectric so that all the winding is extremely
tight and is done in a dust proof room.  One human hair = space = corona =
breakdown.

DR.RESONANCE-at-next-wave-dot-net


----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: capacitor building info 
> Date: Wednesday,October 01,1997 2:09 PM
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 1 Oct 1997 19:40:07 +0100
> From: Gwyn Zucca <gwyn-at-tcbod.demon.co.uk>
> To: tesla-at-pupman-dot-com
> Subject: capacitor building info
> 
> Hello All,
> 
> 
> Following the recent exchanges about the use of paper in home made pulse 
> capacitors, I have been speaking with one of the people at a company 
> that specialises in high voltage, high energy capacitors.
> 
> The guy seemed quite happy to talk to me about the way they construct 
> there caps. He does not advise the use of paper in home made caps due to 
> the difficulty in removing moisture in the paper, however he did give me 
> some tips on the does and donts.
> 
> He says obviously that everything should be as clean as possible.
> 
> Use the thinnest dielectric that is possible, they use polypropylene in 
> the range 10 - 18 microns depending on application.
> 
> Use multiple layers of the dielectric material here again they typically 
> use 2 - 4 layers.
> 
> Limit the electrical stresses, by using many series modules of high 
> capacity to get the appropriate value, for a cap having an AC rating of 
> 15Kv, he advises 10 - 12 series units, he says that they would never 
> exceed 1500 volt per unit in there professionally built capacitors.
> 
> Using 4 layers of a good quality polypropylene film in oil he says 10 
> volts AC per micron of dielectric would be fair.
> 
> They use foil of 5 microns thickness, here again the home made caps have 
> to compromise, but try to keep the foil to less that 20 microns 
> (barbecue cooking foil typically fails in this area ).
> 
> All connections and bushings should be of a heavy duty construction, 
> best 
> to over engineer it, than be of an inadequate design.
> 
> I plan to do some design and experiments in the near future using 6 
> layers of 4 - 6 layers of 25 micron polypropylene film, which can be 
> obtained from companies who specialise in retail packaging. The caps 
> will probably have 12 modules in series, the whole being in oil.
> 
> 
> I would like to hear yours views on this.
> 
> 
> See ya...
> 
> 
> Gwyn
> 
>