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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