Re: The OLTC II lives!

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

Original poster: "Brian" <ka1bbg-at-webryders-dot-net> 

Hi, good looking stuff! thanks for the pic's! cul brian f.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, January 27, 2004 1:48 PM
Subject: The OLTC II lives!


 > Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com>
 >
 > Hi all,
 >
 > I have just got my new OLTC working. Here are some pics:
 >
 > http://www.scopeboy-dot-com/tesla/bigbang.jpg
 > A single shot
 >
 > http://www.scopeboy-dot-com/tesla/ol2sparks1.jpg
 > 2kW input at 500bps. 48" streamers to air.
 >
 > http://www.scopeboy-dot-com/tesla/ol2sparks2.jpg
 > Same, but shorter exposure
 >
 > Technical details: The OLTC II uses a 10" single turn primary, 10" x 30"
 > secondary with 1700 turns, 24" x 8" toroid, 15uF 1kV MMC tank cap, and two
 > 1.2kV 600A Powerex IGBT bricks in parallel for a "spark gap". The peak
 > primary current is around 5kA, but the bricks don't seem to mind.
 >
 > The tank cap is charged off the 240V AC line, via a voltage doubling
 > rectifier, filter cap bank, and DC resonant charging choke/diode.
Thyristors
 > were used in place of diodes in the doubler, so the charging voltage can
be
 > adjusted from zero to over 1kV.
 >
 > At the moment I haven't dared to use charging voltages greater than about
 > 800V, but eventually I hope to crank it up to 1kV and get even bigger
sparks
 > :-0
 >
 > Read about the project in gruesome detail on
 > http://www.scopeboy-dot-com/tesla/
 >
 > Thanks to Terry Fritz who donated two IGBT bricks and a pile of CDE caps
to
 > this project, and also thought up the OLTC concept in the first place.
 >
 > Steve Conner
 >
 >
 >