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*To*: tesla-at-pupman-dot-com*Subject*: Re: streamer length = volts ?*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sat, 21 Apr 2001 11:15:24 -0600*Resent-Date*: Sat, 21 Apr 2001 11:42:42 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <BNG_GC.A.tZE.Pac46-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net> Sadly, no formula exists for this relationship. In a non-uniform field, the length isn't particularly well correlated with the voltage. Of considerably more importance is the amount of energy or charge available to support the growth of the streamer. In a uniform field, the accepted value is around 30 kV/cm (70 kV/inch). However, taking lightning for an example, the overall field just before the leader starts is around 10 kV/meter or 100 V/cm, some 300 times less. A TC that puts out a 10 foot spark (120 inches) doesn't have a voltage of 8.4 Megavolts, but is probably more around 500 kV to a Megavolt. If you want a rough estimate of the voltage on your TC...If there is NO breakout, the voltage is probably less than 30 kV/cm of the smallest radius. However, this really only applies with very smooth surfaces. Any surface bumps or edges (like the corrugations in your dryer duct toroid) reduce the maximum voltage quite a bit (and will promote the growth of streamers). This rule of thumb is probably better for things like smooth Van deGraaff electrodes, for instance. A better length measure is the Freau equation length(inches) = 1.7*sqrt(VA). This is an emprically derived formula which seems to work over a fairly wide range. It is also an optimum in that your sparks will likely be shorter. So, a 15kV at 30 mA NST, nominally around 450 VA, should produce sparks up to around 36 inches long. 24 inches would be a nice reasonable number, and if you aren't getting 12 inches, something is seriously wrong. ----- Original Message ----- From: "Tesla list" <tesla-at-pupman-dot-com> To: <tesla-at-pupman-dot-com> Sent: Friday, April 20, 2001 6:29 PM Subject: streamer length = volts ? > Original poster: "hoggwild89 by way of Terry Fritz <twftesla-at-uswest-dot-net>" <hoggwild89-at-netzero-dot-net> > > Drawing an arc x inches off the secondary...equals xxxx volts per inch ??? > > > Whats the formula ?? > > > >

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