Re: capacitors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

David,
       Thanks for the advice. The method of construction precluded 
successfully impregnating the caps. Refer to my 1995 article In 
"Electronics World" for details.

http://hot-streamer-dot-com/TeslaCoils/OtherPapers/MalcolmWatts/

Malcolm


On 8 Oct 2001, at 20:32, Tesla list wrote:

> Original poster: "david baehr by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dfb25-at-hotmail-dot-com>
> 
> 
> Keep your rolled poly caps IN OIL 
> 
> >From: "Tesla list" 
> >To: tesla-at-pupman-dot-com 
> >Subject: Re: capacitors 
> >Date: Sun, 07 Oct 2001 14:49:01 -0600 
> > 
> >Original poster: "Malcolm Watts by way of Terry Fritz " 
> > 
> >Hi Greg, 
> > My experience with banks of PP caps is that they perform as 
> >well as any caps you could otherwise obtain. I used to roll extended 
> >foil caps using polyethylene sheeting (same ballpark losses as PP) 
> >and kitchen grade Al foil. On switching to the multi-PP caps, I got 
> >sparks that were a little hotter and a little longer for the same 
> >input power. The only significant difference between the two was a 
> >lack of corona in the caps (the rolled caps were dry-fired). It is 
> >imporant that you use plenty of strings in parallel to give high 
> >discharge currents with low I^2R losses in the cap as a whole. 
> > 
> >Regards, 
> >Malcolm 
> > 
> >On 6 Oct 2001, at 11:28, Tesla list wrote: 
> > 
> > > Original poster: "Mr Gregory Peters by way of Terry Fritz 
> >" 
> > > 
> > > Hey everyone, 
> > > 
> > > As most of you know, I am in the process of building a large coil (up 
> > > to 10 kVA). I am currently investigating capacitors. I have had it with 
> > > constructing oil filled rolled or plate poly caps (I've made 6) - too 
> > > messy, too many hours! I read with interest, some pages where people 
> > > have used banks (up to a couple of hundred) of commercial polypropylene 
> > > caps. I was wondering how well these work - are the sparks nice and 
> > > hot, or thin and purple? I was also after some construction guidelines - 
> > > most of these caps have thin leads, therefore requiring a complex 
> > > series/parallel arrangement to handle the current. What resistor 
> > > arrangement is used? How does the polypropylene stack up to LDPE as a 
> > > dielectric? Are these huge banks alot less efficient then a simple 
> > > staked plate cap? 
> > > 
> > > Cheers, 
> > > Greg Peters 
> > > Department of Earth Sciences, 
> > > University of Queensland 
> > > 
> > > Phone: 0402 841 677 
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > 
> 
> 
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