Re: Streamer V/I take 2

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Marco,

Cool!

I graphed the files out into a PDF file here:

http://hot-streamer.com/temp/Marco12.pdf

Ground arcs just seem to completely drain and disrupt the secondary 
system.  It would be interesting to see streamer current to just air 
streamers but that would take fiber probes or some similar isolated 
probe converter.  It would be cool to have a simple easy fiber probe 
system that could hook directly to Pearson current probes.  I should 
work on that.

All the Tek scopes should be able to store "spreadsheet" files which 
are just *.CSV files:

http://hot-streamer.com/temp/Marco12.pdf

In some cases, you might be able to write a simple conversion program 
yourself that reworks the files too.

Very interesting data you have there!

Cheers,

        Terry




At 02:56 PM 7/22/2005, you wrote:
> Hi Terry,all,
>
> It's true, my sample rate was too low. Today I got new data that can 
> be found in:
>
> http://www.iki.fi/dncmrc/scratch/streamer1.zip
>
> Scales: 135.4 kV/V (secondary voltage) and 10 A/V (streamer current)
>
> I used the same Yokogawa as for the previous time, but now also a 
> LeCroy with a 10kword deep memory.
>
> V_000.CSV:  secondary voltage of a single bang at 100 Ms/s, breaking 
> down to ground
> V_000_CORR.CSV: V_000.CSV corrected for the voltage probe distortion 
> (use this one)
> I_000.CSV: streamer current of the same bang
>
> V_001.CSV: voltage of the last 5 bangs in a sequence of 10 at 5 Ms/s
> I_001.CSV: streamer current of the same bang
>
> V_002.CSV: voltage of the last 2 bangs in a sequence of 3 at 20 Ms/s
> I_002.CSV: streamer current of the same bang
>
> I have also got more stuff in WFM format but sadly Tektronix 
> utilities are not capable of translating it into CSV format. The 
> LeCroy software has always been sucking and the Literunner is not an exception.
> Anybody knowing an utility to do the conversion?
>
> Note that voltages of 001 and 002 are not corrected but I think it's 
> not relevant at this stage. Now, if we examine the 000 data we can 
> notice some features that can be found also in the lower sample rate 
> versions. Referring to the 000, I can identify at least the following zones:
> 1. leader discharges around sample n.1450 and 4200, current max 5A. 
> It is easy to notice that in correspondence of those points the 
> voltage sinusoidal trend gets linearized (as for the linear decay of 
> a spark gap)
> 2. streamer discharge between 4800 and 5000: the current grows 
> linearly and the voltage decreases again linearly.
> 3. bang! The channel opens at 5000. Current overflows peaking at 
> over 100A, voltage drops rapidly to zero.
> 4. voltage reversal between 5000 and 5400: primary left (?) energy 
> is consumed in the breakdown, voltage stays to zero.
> 5. secondary free-running: after 6000 the breakdown channel gets 
> open, the secondary circuit oscillates freely with the few energy still left.
>
> I think now we should check the frequencies of each zone, understand 
> were the energy resides in each zone and try to simulate this with 
> PSpice. Now I have to get some sleep.
>
> Best Regards
>
> P.S. LeCroy generated files (CSV and WFM) are real trash. They need 
> so much manual postprocessing!