Re: SISG first sparks!

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mr Gregory Peters <s371034@xxxxxxxxxxxxxxxxx>

Hi Terry,

Over here in Australia we don't have the blessing of high current
single phase feed lines to our houses, though I did manage to convince
someone to install a 40A single phase line :). Those of us wanting to
run large machinery, etc (me), instead are able to have 3-phase
installed - a technically better, more efficient system then what you
US guys have, but not so good for conventional large TC use. This has
always been a nuisance, but maybe now it will be an advantage.

I'm contemplating the construction of a 6-pulse rectified 3-phase
supply using the vast array of MOTs I have lying around, which would
suppply DC relatively free from ripple (note, i say relatively free -
about 14% ripple). If I use two series MOTS (centre tap removed) on
each phase, and assuming I extract the full interphase voltage, we are
looking at about 10kV DC.

I'm wondering how you predict the SISG would perform in this scenario?
I assume it would work fine, but probably at 300BPS? Finally SSTC
design has become simple enough for anyone to make, probably with
little to no test equipment - and at high power levels too!

Greg Peters
Department of Earth Sciences,
University of Queensland, Australia
Phone: 0402 841 677
http://www.hot-streamer.com/greg2



----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Saturday, May 13, 2006 10:52 am
Subject: SISG first sparks!
> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi,
>
> I wired up some odds and ends and put the gap on a coil:
>
> http://hot-streamer.com/temp/SISG-006.jpg
> http://hot-streamer.com/temp/SISG-007.jpg
> http://hot-streamer.com/temp/SISG-008.jpg
>
> The firing voltage is 1800V and it is running about 60BPS.  The
> arc
> to ground is 5 inches.
>
> The coil is 150kHz and the primary cap is 150nF so the bang energy
> is
> 0.243 Joule.  So its about 14.6 watts.  The old IGBT got just
> barely
> warm and the new one stayed cool (no heatsinks).
>
> This system was very far from optimal, but it did make nice sparks
> with the new gap ;-))  When I get a lot more IGBTs, I can run it
> at
> 100 times the power ;-)))
>
> Cheers,
>
> 	Terry
>
>
>