Re: ball topload

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

Kewl. Where do I get 1 of those awesome 38" spheres?
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, October 24, 2003 11:18 AM
Subject: Re: ball topload


 > Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 >
 > Hi,
 >
 > The breakout voltage for 11 inch radius is about 840kV.
 >
 > The capacitance of the sphere is 31pF.  But a real system will be around
50+pF.
 >
 > The energy needed to charge that capacitance to 840kV is 17.64 joules.
For
 > a 120BPS system operating at 50% efficiency, we get 4.2kW input just to
get
 > it to the breakout point!
 >
 > You may need more power for good streamer growth (but I am just
 > guessing.  Would have to compare these numbers to normal coils).
 >
 > So about 5kVA minimum.  I think once it broke out you would be able to
 > sustain the streamer without too much more power.  10kVA should certainly
 > do well.
 >
 > Note that the 840kV breakout is really high compared to normal coils.  The
 > secondary coil or other things may want to breakout before the top sphere.
 >
 > About 4 years ago someone (Gary Weaver?)* had a 3 foot buoy on a
 > coil.  They had to use a breakout point.
 >
 > http://bhs.broo.k12.wv.us/homepage/chip/current/gweaver/map.html
 >
 > http://bhs.broo.k12.wv.us/homepage/chip/current/gweaver/TC10-1.JPG
 >
 > He has 240VAC at 40 amps for 9.6kVA.
 >
 > Strange how I can remember these things *:-))
 >
 > Cheers,
 >
 >          Terry
 >
 >
 > At 08:54 AM 10/23/2003, you wrote:
 > >Anyone know what would be a good kva input (to get single arcs) for a 22"
 > >sphere?
 >
 >