From: "Malcolm Watts"
Date: Thu, 28 Jun 2001 09:55:11 +1200
Subject: Re: [TSSP] Toroid breakdown voltage indirect meas.
Hi Paul, On 27 Jun 01, at 8:39, Paul wrote: > Marco Denicolai wrote: > > > - Feed voltage 18 kV or less (i.e. toroid 585 kV or less): no streamers, > > NO CORONA anywhere. > > - Feed voltage 18.35 kV or more (i.e. toroid 598 kV or more): streamers, > > NO CORONA anywhere. > > Marco, > > This is interesting. Could you let me know your primary tapping > point and primary cap size? My simulations, so far using guesses > for these numbers, lead to generally around 450kV for 20kV feed. > > Amazing how suddenly the streamers appear. Does further increase > in feed above 18.35kV increase the streamer length, or does it > increase their number or brightness? This is generally observed on all coils. I watched Greg Leyh doing some single shot tests on Electrum. 34kV - no streamers at all. 35kV - 7 foot single-rooted air streamers with the usual multiple branching at the tips. There is a well defined voltage required to cause breakout for any given configuration. It is most pronounced with a large emitting surface (virtual, as in the case of Electrum's topload with its welded bars, or real "filled in" surface). Regards, malcolm
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.