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Re: failed cap
Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com>
I read somewhere (I think it was Brent Turner's TC book) that thick
dialectric sections (whether 1 piece or multiple smaller ones) slow down the
discharge rate. Is there a way/formula to tell how much? Is this more/less
of a big deal than ,say, too thin a plate (foil vs flashing) when it comes
to esr? I'm guessing that's why energy discharge caps are made with dozens
of thinner pp/pe sections as opposed to 1 with 100 mill total thickness.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, December 02, 2003 10:00 AM
Subject: Re: failed cap
> Original poster: "philip barnes" <luck_phil87-at-hotmail-dot-com>
>
> I removed the bad layer and associated plates and stuck it back in oil
> (with who knows how much trapped air but anyway). After connecting it up
to
> my TC is works! Perhaps only had 1 minutes total run time so far and
really
> only seconds of on time each run and also using a slightly reduced gap but
> it is still working. wooohoooo. Wounder who long it will last this time
> lol. I use 16 layers of 4 mil poly btw. A rought burr on the end of one
> plate appears to be th reason that layer failed. punched a half inch hole
> in the poly to the plate above and below it.
>
> Phil
>
>
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: failed cap
> >Date: Mon, 01 Dec 2003 17:00:29 -0700
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> >Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com>
> >
> >Phill. My students and I have buitl over 12 low d. polyethylene/oil
> >capacitors with only one failier caused by not enough total thickness. we
> >use 12 layers of 4mill between plates with no problems. We use clear
mineral
> >oil with no additives. Never tried to use thick poly. others have had
> >problems with thick poly, More layers less trouble.
> > Robert H
> >--
> >
> >
> > > From: "Tesla list" <tesla-at-pupman-dot-com>
> > > Date: Mon, 01 Dec 2003 08:02:07 -0700
> > > To: tesla-at-pupman-dot-com
> > > Subject: Re: failed cap
> > > Resent-From: tesla-at-pupman-dot-com
> > > Resent-Date: Mon, 1 Dec 2003 08:10:04 -0700
> > >
> > > Original poster: BunnyKiller <bunikllr-at-bellsouth-dot-net>
> > >
> > > Hi Phil...
> > >
> > > hmmmmmm building ones own cap... you didnt see my website did
you
> > ?? ;)
> > >
> > > no matter how hard you try to build your own cap ( and yes Ive built 3
of
> > > them and all 3 failed eventually the plate cap lasted the longest
> > > but it was made from ultra clean PE sheeting 70thou thick with REAL
> > > transformer oil...) its best to buy a manufactured cap set be it an
> > > MMC or Maxwell's systems on Ebay ( best prices Ive seen as to date)
> > > .. I have done rolled caps plate caps glass caps and wasted alot of
$
> > > doing so ( but hey it was a learning experience and ehhhhhh yes...
> > > it was expensive)
> > >
> > > definately sounds like you have blown a hole in the dielectric ( PE
> > > sheeting) and the oil is arcing out ( pull it apart and look for the
> > > black holes in the plastic) ...the spark gap at that setting is less
of a
> > > resistive value than oil in the cap... yes most definately ..
without a
> > > secondary in place to "asorb" the energy the cap will arc out
first....
> > >
> > >
> > > bite the bullet and buy a set of MMC caps or a set of Maxwells dont
do
> > > what I did and waste your money trying to build a home made cap...
> > > unless you like learning the hard way ......
> > >
> > > Scot D
> > >
> > >
> > > Tesla list wrote:
> > >
> > >> Original poster: "philip barnes" <luck_phil87-at-hotmail-dot-com>
> > >> Hi.
> > >> i built a cap with 1.6 mm or 64 mil thick PE dielectric and put the
> > >> whole thing in canola oil. It worked great for a while but while i
had
> > >> just the cap across the nst ,,, with no tesla coil connected.. to
test my
> > >> new mulitgap sparkgap... the PE between 2 of the plates broke down
and
> > >> now it blows bubbles and hisses and only produces a spark in the gap
if
> > >> the gap is 1 mm or 30 mil . Its pretty much had it and must be
breaking
> > >> down at 1 or 2 thousand volts..IS it more stressfull on a cap with no
> > >> tesla coil connected and is it suprising my cap did not last in my
> > >> config. The plates are 1.75" clearance from each end and 1" along the
> > >> sides. !6 sheets of makes each layer
> > >>
> > >> Phil
> > >>
> > >>
> > >
> > >
>
>