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Re: Many dry caps in series?
Gary and all,
Exactly my thinking also. I second your request for knowledge and
experience by others with such a scheme--anyone done it? My added thought
is the concern that if a couple of sections were to fail, then the rest of
the sections would be voltage stressed and would likely also fail
prematurely. I believe it would be a good idea to put safety gaps across
each series cap. I also think it is risky using a single layer of
dielectric, such as home depot 6 mil drop cloth whose manufacturer probably
doesn't care if it has a few pinholes in it. Even at only a couple of KV
per series cap, I believe it would be safer to go with, say, 3 layers of 2
mil, which would virtually assure flaws in layers would not end up being
aligned.
--Steve Young
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> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Many dry caps in series?
> Date: Saturday, October 17, 1998 3:45 PM
>
> Original Poster: Gary Lau 17-Oct-1998 1702 <lau-at-hdecad.ENET.dec-dot-com>
>
> I'm considering a new capacitor design that uses 20 rolled poly
> capacitors in series, each using a single 6 mil LDPE dielectric. I would
> again use extended-foil construction with household aluminum foil. Would
> such a construction reduce the voltage per cap enough that it wouldn't
> create corona and be necessary to displace the air with oil? I'd love to
> avoid that whole oil-thing!
>
> Gary Lau
> Waltham, MA USA
>
>