Re: Capacitor dielectric voltage rating

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


search the archives ,  type in' Bill Richards' ,... second  subject 
down  ' capacitors ' , I think 200v per mill would be a pretty safe 
bet ??   My homemade TCBOR caps have held up well over the years with 
only a few failures , ( fairly easy fixes ) . the poly is 60 mil  and 
I set my gaps with a 12kv neon , though im using a 14400 baby 1.5 pig 
at 3kw,......these are old caps  ( around 1992 ) or so ............


From:  "Tesla list" <tesla@xxxxxxxxxx>
To:  tesla@xxxxxxxxxx
Subject:  Re: Capacitor dielectric voltage rating
Date:  Fri, 27 Apr 2007 23:33:48 -0600
>Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
>PE can rate from 450V/mil to 1200V/mil. How pure (absence of
>contaminants) PE is will determine it's puncture voltage. It's hard
>to know just buying PE roll stock. It's best to test it. If you have
>a means of varying the voltage on a hv supply (such as a variac),
>you can then do the test yourself. Take several samples along the
>roll and get a decent average of "that rolls" puncture voltage.
>Also, the dielectric constant of PE is 2.2 to 2.3.
>
>This is really the only way to be sure. Anything else is a guess and
>may not apply to the PE you purchase.
>
>Take care,
>Bart
>
>Tesla list wrote:
>
>>Original poster: jhowson4@xxxxxxxxxxx
>>Hey guys how many volts can 4 mil of polyethylene withstand.   I am
>>making a cap and am trying to figure out how thick I need the
>>dielectric to be.  I have 4 mil sheets.
>>
>>Many Thanks
>>
>>
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>>
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