Re: Magnetic quenching.

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

Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com> 

Along those lines, has anyone that can afford an SF-6 blown gap tried it?
Denser (more conductive during an arc), higher dielectric strength (shorter
gap nfor given voltage), and higher thermal conductivity (better cooling
with a given sized fan). Seems like it would be half as lossy as an air gap.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, March 13, 2004 2:12 PM
Subject: Re: Magnetic quenching.


 > Original poster: Sean Taylor <sstaylor-at-uiuc.edu>
 >
 > On Fri, 12 Mar 2004 21:33:06 -0700, Tesla list <tesla-at-pupman-dot-com> wrote:
 >
 > >Original poster: John <fireba8104-at-yahoo-dot-com> Hi,
 > >   I was thinking the same thing but with a complex controller. The idea
 > > is that a short burst of high current (large value cap?--include diodes
 > > to attempt to stop ringing) is supplied to a electro-magnet every half
 > > cycle in order to "trigger the gap".This idea stems from a former post
 > > where breakdown voltages were given, showing a lower breakdown voltage
 > > with magnetic flux applied. Also, if is not to complex,  a current
 > > detecting device could be used to tell when the first notch is reached,
 > > triggering another magnetic pulse to quench the gap. To sum it up a sync
 > > trigger and a event(first notch) trigger for a single electro-magnet.
 > >Feasible, with a lot of work or just random ramblings.
 > >Cheers,
 > >John
 >
 >
 > Just thought of something . . .  First, I was (and I'm sure many others)
 > are thinking the same type of thing - a reverse triggered gap kind of.
 > Trigger exactly when you want the quench to take place.  Problem is, if
you
 > try to quench on a zero current crossing with a magnet, you won't get
 > anywhere until the current reaches some higher value.  As someone already
 > pointed out, a magnetic quenched gap works by deflecting the arc by
 > "pushing on the moving electrons - F = qVxB.  Problem is, for there to be
 > an velocity, there has to be current flow - so at a zero current crossing,
 > there is no force on the plasma channel.  Honestly, I don't see what the
 > advantage is (performance-wise) of a magnetic quenched gap vs. air blown.
 > Seems like the air blown gap would help everything - disperse ions, make
 > the arc path longer to help quenching, and cool the terminals.
 >
 > Sean Taylor
 > Urbana, IL
 >
 >
 >