From: Marco.Denicolai@tellabs.com
Date: Mon, 7 Oct 2002 15:29:43 +0300
Subject: RE: [TSSP] TOPV breakout threashoul
Hello all,
> -----Original Message-----
> From: bert.hickman@aquila.net [mailto:bert.hickman@aquila.net]
> Sent: 7. lokakuuta 2002 14:45
> To: tssp@abelian.demon.co.uk
> Subject: Re: [TSSP] TOPV breakout threashoul
>
>
>
> The effect of space charges on RF breakdown is presented in Loeb
> ("Fundamental Processes of Electrical Discharge, McGraw-Hill/Chapman &
> Hall, 1939), reflecting the work of L. E. Reukema. Reukema used sphere
> gaps
> and relatively short gaps (0.25 - 2.5 cm). He found a progressive
> lowering
> of breakdown voltage, by as much as 17% (about 25 kV/cm), as the
> frequency
> was increased between 20 kHz and 60 kHz. However, no further breakdown
> voltage reductions were seen between 60 kHz and 425 kHz.
> -- Bert --
> --
> Bert Hickman
> Stoneridge Engineering
> "Electromagically" (TM) Shrunken Coins!
> http://www.teslamania.com
>
I recall Reukema was cited on:
Meek, Craggs (eds.), Electrical breakdown of gases, John Wiley & Sons,
1978.
I think the 17% was for uniform field. For not-uniform one (e.g.
point-plane) the breakdown lowering was about 50%. I haven't got the
book here right now :(
Just to have an idea, think to the Plank dissertation. If I got it
right, they were counting corona pulses as a mean to detect gas
mixtures. Humidity and applied voltage highly influenced the pulse
frequency. By just adding a DC component to applied voltage they were
able to change the breakdown characteristic and find a "plateau" where
the counting was almost independent from the previous factors and much
more usable for industrial purposes.
Best Regards
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