Re: CONCERTINA CAP

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

Original poster: "colin.heath4 by way of Terry Fritz <teslalist-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com>

hi there,
             im also a uk coiler. the trip units in these nsts is so simple
to bypess you wont believe it. just run a wire from the e terminal to the
earth terminal and there you have it!
also you can get 10kv at 100ma new from tunewell.
the pole pigs you can get 11kv 16kva from electricity board for a very small
fee if you can convince them your not stealing electricity.
16kva makes you a good customer!
cheers
colin heath
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 08, 2003 7:25 PM
Subject: Re: CONCERTINA CAP


 > Original poster: "Phil Parry by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<ryukin-at-ntlworld-dot-com>
 >
 > Hi Ian,
 >
 >  > First of all hello everybody, this is my first correspondence to the
 > 'list'.
 >  > I am in the process of building my first coil (4 1/2") and after
searching
 > the
 >  > W.ibbly W.obbly W.ay I discovered this fantastic information resource.
I
 > was
 >  > amazed to see so many 'insane' people out there with the same
inexplicable
 >  > fascination with electrical discharges. Perhaps I'm not that mad after
 > all?
 >
 > There are more of us than you think!  We UK coilers have our own group and
 > website (www.tcbouk-dot-org.uk) - there is a Teslathon planned in the
Nottingham
 > area late August/early September and another in Cambridge in October
(exact
 > dates TBC) if you don't mind the trip and want to meet other coilers/show
 > off your stuff!
 >
 >  > Anyway I'll get to the point. With respect to rolled caps having self
 >  > inductance
 >  > and long discharge paths, I was wondering about folding i.e. a
concertina
 > cap.
 >  > I know that the effective capacitance would be half that of a roll for
a
 >  > given length of material, but the discharge path would be very short
and
 >  > very low
 >  > resistance (one could run the bus-bars right along the exposed ends or
 > loops.
 >  > The reason behind my thinking is as follows. I work as a buyer for a
 > roofing
 >  > company and we carry large quantities of self adhesive allu. flashing
and
 >  > rolls
 >  > of thick (up to 2mm), poly roofing membrane, p.v.c. pipes of all
diameters
 >  > etc. so my plan was to burnish down the allu flashing to the poly
membrane
 >  > excluding all the air. Then when folded the only place air can be
trapped
 > is
 >  > between plates of the same polarity. Why not just build a stacked plate
 >  > cap? I hear
 >  > you cry, well.....I am I just thought this would reduce production time
 > and
 >  > make it easier to exclude air. It's just a thought.
 >  > Any comments anyone?
 >
 > I don't foresee any huge problems as long as you oil-fill the cap to
prevent
 > corona from the folds and edges, but others on the list can probably give
 > better advice.  Most people have abandoned homebrew caps in favour of
MMC's
 > now though.
 >
 >  > Also I don't seem to be able to find any detailed info on d.c. resonant
 >  > charging or magnifier coils
 >
 > www.richieburnett.co.uk has some excellent info on DC charging.
 >
 >  > and I'm struggling to find a suitable
 >  > transformer as
 >  > nst's are limited by law in the u.k. to 10kV -at- 60mA and also have
internal
 >  > trip
 >  > switches for earth leakage and or short circuit (or so I'm told by
 > somebody in
 >  > the industry)
 >
 > That explains the problems I've had finding decent NST's :)  Thanks for
the
 > info - I didn't know that.  Im concentrating on valve coils (VTTC's) at
the
 > moment so MOT's and radio transformers are more my thing.
 >
 >  >, pole pigs are very rare. (except those 33kV jobs that weigh as
 >  > much as a car and cost as much as a house!) I know I can series two
mot's
 > but
 >  > that's still only 4kV.
 >
 > You can use voltage doublers/quadruplers on a MOT stack for more voltage.
 > Steve Conner's 3.5" coil (www.scopeboy-dot-com/tesla) uses a 10kV DC supply
from
 > a single MOT - I saw this in action at the Derby Teslathon a few weeks ago
 > and it was very impressive for its size.
 >
 > Welcome to coiling - hope to see you at a Teslathon sometime!
 >
 > Cheers
 > Phil
 >
 >
 >