RE: Gap Arc Voltage HERES ONE TO THINK ABOUT

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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
> ------------------------------
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