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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
 > > >>
 > > >>
 > > >
 > > >
 >
 >