Re: Streamer V/I evolution - Topics Moderator note

["Tesla list" <tesla@xxxxxxxxxx>]

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