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Re: Dialectrics in Plate Capacitors
to: Rick
60 mil is not adequate for 15 kV Erms which will hit well over 20 kV peaks.
Recommend at least 90 mil. Professional manufacturers use .002 mil and then
connect up to 30 segments in series.
1 inch will not provide enough creepage path across the plastic to avoid
tracking especially at RF frequencies. Go at least 2 inches.
Put it in a PVC tube == oil filled. Forget the silicone idea.
Regards,
Dr. Resonance
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, December 17, 1999 8:43 PM
Subject: Dialectrics in Plate Capacitors
>Original Poster: Apollo <ollopa-at-jps-dot-net>
>
>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
>
>
>