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Re: Blown Rolled "Hull" Capacitor Discussion


On Fri, 1 Mar 1996 tesla-at-grendel.objinc-dot-com wrote:

> rising up thru the oil.... only they never stopped.  I became suspicious and 
> poured some oil into a capacitor housing that had no cap in it and connected 
> the pump.  Sure enough, the vacuum pump could pull air right thru the pvc 
> plastic end cap.  Although a vacuum can pull air through the plastic, oil 
> will not leak out.  The result of trying to use a vacuum pump was that I 
> ended up sucking millions of air bubbles INTO my capacitor, not what I was 
> trying for.
> Anyone else tried this with better luck?
> 
> Bert

I coated the pvc-tank inside with polyester-resin so that there was no pvc
with direct contact to the oil. I did this because I had heard rumours of
oil diffusing through pvc.. My top-plate was 10mm thick acrylic plate with
three holes - two for 12mm brass bolts (electrodes) and one with a plastic
valve glued to it. Via this valve I pulled the vacuum and poured the oil
in (I used a special hose with connections to vacuum pump and oil
reservoir) - after that I closed the valve to keep the casing airtight so
that the oil would not get any moisture from the air. 


Kristian Ukkonen.