Dialectrics in Plate Capacitors

• To: tesla-at-pupman-dot-com
• Subject: Dialectrics in Plate Capacitors
• From: Apollo <ollopa-at-jps-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 17 Dec 1999 17:10:00 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I have two sheets of 60mil 4'x8' HDPE.  I need to make a capacitor for 
my 15kv 60ma NST.  I'd like to make a .02uf capacitor, but I'm not sure 
if I can.  Will I need to put two caps in series to handle my NST?

Since I have 60mil HDPE, there's no way I can roll a cap and I've decided
that I'd rather build a stacked plate capacitor anyway.  My research
suggests that I should let the poly hang over the foil by at least one 
inch on all sides, but I don't understand why this is necessary if I submerge
the plates in an oil with a dialectric strength equal or greater than that of 
the poly.  If it won't puncture .06in of poly, why will it arc from end to end?
What if there was only a quarter-inch of poly overhang that was sealed with 
silicone sealant?
 
Thanks - Rick Richard 

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