I agree with David and DC. When I was still working they were testing a
100Kv system and they had to run it in a 18' dia vacuum chamber. Not every
one has one of these. It was being moved to a 30' chamber when I retired.
Rich
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Rieben
Sent: Thursday, December 06, 2007 8:59 AM
To: Tesla Coil Mailing List
Cc: David Rieben
Subject: Re: [TCML] x-ray transformer for Tesla supply
Hi DC, all,
Yes, the consensus of the list responses to this question only verifies
my own thoughts on this matter. >100 kV voltages (or >30 kV volt-
ages, for that matter) would just be too unwieldy for practical use in
Tesla primary circuits. I think list member Scot 'Bunnykiller' Dingman
has documented the significant voltage standoff difficulties associated
just from seriesing (2) 14,400 volt pigs, overdriven with up to 280 volts
from a variac, given 'max out' primary circuit voltages of around 33 kV.
David Rieben
----- Original Message -----
From: "resonance" <resonance@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, December 05, 2007 10:26 AM
Subject: Re: [TCML] x-ray transformer for Tesla supply
For reasons previously discussed on the list this is a bad idea.
The HV requires extra insulation, is problematic, and simple not worth
the
effort. You can achieve sparks up to 80 feet long with a standard 14.4
kV
pole xmfr so why go to higher voltage when it's completely unneccesary?
The caps require lots of current for rapid recharge and an x-ray xmfr
will
not put out 1 to 1.5 Amperes as a pole xmfr can easily do. Plus, a pole
xmfr when recased weighs only approx 125 lbs --- compare to a large xray
xmfr at 350 lbs.
Dr. Resonance
Resonance Research Corp.
www.resonanceresearch.com
----- Original Message -----
From: "David Rieben" <drieben@xxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, December 05, 2007 8:18 AM
Subject: [TCML] x-ray transformer for Tesla supply
Hi all,
Has anyone on the list successfully used an x-ray transformer
anywhere near its rated output voltage to power a Tesla coil?
(operating at less than 30% of its rated output voltage doesn't
count :^). I have one friend that seems convinced that you could
make a killer coil by running the Tesla primary circuit with over
100 kV but I've always been under the impression that the in-
creased corona losses coupled with the required dramatic increase
in voltage standoff would make such a circuit impractical. Also,
the primary capacitor(s) would have to be able to withstand several
100 kVs although it's rated capacitance could be relatively small.
I'm certainly not trying to demonize x-ray trannies (the old style
60 hz ones, that is) as they absolutely ROCK! With my 150 kVp,
600 mA rated 500-600 lb unit, I can self start arcs at 12" with <
90% of its rated input voltage and 'pull out' 40" power arcs while
pulling over 120 amps through my Green Monster coil's variac and
ballast for 10 minutes at a time and the outer tank surface never
gets the slightest bit warm! Whooppee!! However, I do not believe
these transformers are practical as Tesla coil power sources. Any-
one have any other viewpoints, opposing or supporting? ;^)
David Rieben
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