Re: Gap Arc Voltage HERES ONE TO THINK ABOUT

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Dan,

Here's a quote from the North Report which agrees:

"...What is surprising to many is the fact that the voltage between
conductors required for surface corona is
twice as great for sphere-to-sphere as for sphere-to-plane geometry because
the aggravated condition at the
spherical surfaces is now, in effect, divided in half. (The corona will
actually start first at the surface of
the conductor that is negative with respect to the other)......"

Looks like North was right about what you experienced AND that you would be
surprised...

Take care,
Bart

Tesla list wrote:

> Original poster: "Mccauley, Daniel H by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>
>       This is something that boggled me when i first heard it.
>
> We had a scenario where we had a cylinder pipe on one side of this tunnel
> which was running 500kV on it.  On the other side of the tunnel we had a
> flat ground plane.  During initial hi-pot testing, we were getting corona
> discharge between the two with an occasional arc.  Since we figured a curved
> surface in space with an "infinite - we'll say that for our case here since
> the ground plane was >>> than the cylinder pipe") would be the best
> scenario.  However, it was not.  A high voltage expert from George
> Washington University came up and said all we needed to do was add a similar
> cylinder pipe attached to the ground plane directly across the tunnel from
> the high voltage pipe.
>
> Well, none of here would believe it, but it worked!!!!
>
> So in the end, the amount of voltage required to gap across two spheres is
> much more than the voltage required to gap between an infinite plane and a
> sphere at the same distance.
>
> Dan
>
> > Bart
> >
> > I would think that a plane - plane
> > equation would only apply when the gap
> > between the electrodes was significantly
> > less than the diameter of the flat area,
> > if you had - for example, two round, flat
> > electrodes 1 cm in dia and 1m apart it
> > would be best modelled as two points or
> > balls rather than a plane.
> >
> > regards
> >
> > alex
> > ------------------------------
> > Alexander JJ Rice
> > Geek#-1232
> > Rank : G-2 (Wahey!)
> > http://www.TheGeekGroup-dot-org
> >
> > ICQ : 114007491
> > MSN : ajjrice-at-yahoo-dot-com
> >
> >
> >
> >
> >
> >
> >