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Re: Peak Primary Current



Original poster: "Jim Lux" <jimlux@xxxxxxxxxxxxx>

Ooops.. I misdivided.. see below..

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, April 20, 2005 11:04 AM
Subject: Re: Peak Primary Current


> Original poster: "Jim Lux" <jimlux@xxxxxxxxxxxxx> > > > ----- Original Message ----- > From: "Tesla list" <tesla@xxxxxxxxxx> > To: <tesla@xxxxxxxxxx> > Sent: Wednesday, April 20, 2005 9:14 AM > Subject: RE: Peak Primary Current > > > > Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx> > > > > > > Antonio, Terry: > > > > Thanks for response. My testing confirmed Gary's observations(Gary's > > tests very interesting). This contradicts old common "coilers" belief > > that heavy gauge wire is required for primary connections. > > > > I see I forgot Pi in the formula(Thanks Antonio for pointing out). > > So Imax = 2*Pi*Fres*V*C > > This makes Imax Pi times the values I had calculated so current is even > > higher than I thought. I still can't believe I can push that much > > current through #14 ga wires with no significant heating!! I realize > > each cycle is only 2uS and ring-up is only 10 uS with 1st notch at 40uS. > > So the duty cycle is quite low... 40E-6 seconds of current flow with 8666E-6 > seconds between bangs. Ball park there is about 1/200.. Even though the > power is the current squared, the small duty factor (0.005) means that > average power dissipation is quite low. For instance, if your rms current > (during the bang) is 100 A, and the resistance of the wire is 0.01 ohm, the > peak power dissipation is 100*100*.01 = 100W. The average power dissipation > would be only 1/2 watt in this case, though.

That's 8333E-6 seconds, not 8666.. No matter, the basic idea is still the
same.