RE: Capacitor plastic thickness

To: tesla <tesla-at-grendel.objinc-dot-com>
Subject: RE: Capacitor plastic thickness
From: Richard Hull <whitlock-dot-com!RICHARDH-at-uucp-1.csn-dot-net>
Date: Thu, 04 Apr 96 09:54:00 PST
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Dave,

Actually, the use of multiple layers of thinner dielectric is better from a 
number of standpoints.  Did you realize that the pros only use a total of 
about 15 mils of plastic to stand off 70,000 volts in their caps!  But there 
is a gottcha.  The pros tend to use 1 mil dielectric and wind 15 caps which 
they put in series.  This is the ideal way of handling high voltages in any 
cap design.  You would be winding til the cows come home, though.  1 mil 
dielectric can't be handled by hand winding (machines needed).

A 0.5 mil thick piece of polypropelene is rated at 8,000 volts per mil.  But 
a single piece of 20 mil dielectric of the same type will blow at 8,000 
volts in a tesla circuit,

With 23 pieces of 4 mil poly you have the increased risk of trapped air 
bubbles... 23 times to be exact.  I have never done what you propose, but 
you might try it and let us know what happens.  That's a lotta plastic 
sheets!

Richard Hull, TCBOR


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From: tesla
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Subject: Capacitor plastic thickness
Date: Wednesday, April 03, 1996 8:05PM