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Re: Streamer V/I evolution - Topics Moderator note



Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>


Hi,


> Original poster: Steve Ward <steve.ward@xxxxxxxxx> > > Hi Terry > > > > Here is a typical higher speed scope capture I got: > > > > http://hot-streamer.com/temp/Marco-001.gif > > > > The scope is 100MHz. The yellow is the top voltage from the plane > > wave antenna (not in a real good position sitting on a trash can > > under the table...) and the blue is the current from the Pearson. It > > looks like the big spark takes place in about 50nS! The raw > > numerical data file is here: > > > > http://hot-streamer.com/temp/Marco-002.CSV > > Are you suggesting that the spark only lasts for 50nS? This is > strange in that when viewing the primary current on my DRSSTC during > ground strikes, it "seems" as if the streamer lasts for at least a few > RF cycles. Im basing this on the observable increase in primary > current levels at a specific point. I do note a spike in the waveform > when the arc connects, but the primary current stays elevated for the > rest of the bang. Now im wondering if simply the fact of the > secondary capacitance being drained to zero (perhaps in that 50nS) is > what kicks the primary current up, or if the streamer would have to > "hold" the secondary output voltage down (for many uS) to have that > effect. I think pspice will tell me... More later, time for school! > > Steve > When viewed from the primary any dynamic load on the topload would be modified by the frequency response of the system. I have not crunched the numbers. But a 50nS pulse is going to look like an impulse to the average system that is resonant at a few 100kHz. So the response at the primarty to an impulse on the secodary will be a the clasic two damped sinewaves. (assuming a lumped approximation).


Robert (R. A.) Jones A1 Accounting, Inc., Fl 407 649 6400