From: Bert Hickman
Date: Thu, 10 Oct 2002 07:42:33 -0500
Subject: Re: [TSSP] Top Voltage
All, Is the presence of the larger toroid "shielding" the sphere, reducing the effective E-field at its surface? This might explain higher than expected breakout voltage... -- Bert -- -- Bert Hickman Stoneridge Engineering "Electromagically" (TM) Shrunken Coins! http://www.teslamania.com "Terrell W. Fritz" wrote: > > Hi Paul, > > At 07:55 AM 10/9/2002 +0100, you wrote: > >Terry, > > > >Can you confirm whether or not the sphere/rod was the breakout > >terminal, or were you running into the toroid alone? > > I have the mid size ball on top of the all-tread rod in this case: > > http://hot-streamer.com/temp/OLTC10-09-01.jpg > > The center of the small ball is 1.9 inches above the top side of the toroid. > > > > >You must have been peaking circa 200kV on the topload, so > >a topload charge peaking at Ctop * Vtop = 25pF * 200kV = 5uC > >by comparison, so maybe 10% of the available positive > >charge is being forced out, never to return. > > Yes, the models say 190kV. > > > > >Looks to me like unequivocal evidence of that space charge. > > > >With the toroid alone, no rod or sphere, the topvolts for 26kV/cm > >on the toroid surface is calculated to be 410kV, so we are seeing > >early breakout (I hope Terry says the rod/sphere assy was not > >attached! Can the residual charge test be repeated with one of > >the spheres as breakout terminal?). > > > > The sphere was there but just far lower than before. I need to be sure that is > were it was breaking out too. > > Cheers, > > Terry > > >-- > >Paul Nicholson, > >--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.