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Re: rolled caps, a new twist



Subject: 
        Re: rolled caps, a new twist
  Date: 
        Sat, 22 Mar 1997 14:52:10 -0500 (EST)
  From: 
        richard hull <rhull-at-richmond.infi-dot-net>
    To: 
        Tesla List <tesla-at-pupman-dot-com>


snip

>> 
>> The down side is a slight reduction in capacitance and an incerease in
>> dielectric losses.  Neither of which is even moderately significant.
>> 
>> Snuuber poly caps use this construction due to the harsh pulse action
>> they
>> must survive.  The best high energy discharge caps however lose the
>> paper
>> for max energy transfer.
>> 
>> Richard Hull, TCBOR

Richard,
>
>Where can I find info on this effect of max energy transfer?  Are there
>reported tests of people who 
>have designed and built capacitors? 

 snip

>Thanks in advance, Richard.
>

>Chuck
>
>
Chuck,

This information is commonly available in any good book on capacitor
design.
Paper has a higher disappation factor than polyethylene or polypropelene
and
the introduction of this into a capacitor starts to disappate power. 
Again,
it is truly negligable when used in this scenario and actually makes the
cap
a bit more surviviable around high transient situations.  In general,
the
paper should be 1/2 to 1/10th the thickness of the plastic dielectric. 
The
capacitance of the unit falls off as this thickness of paper increases.

Richard Hull, TCBOR