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Re: DRSSTC Tuning Study (initial data)
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Dan,
Thanks for this wonderful data!!!
The very precise operation of the DRSSTC (a well
known one) along with your data removes a whole
lot of "noise" about streamer power, propagation, arc length etc!!!!
ScanTesla easily agrees with the coil's operation
but is having trouble with the streamer
lengths. One problem is that streamer
capacitance increases dramatically as a streamer
nears a ground strike target. I never had any
data to deal with that before, I do now!! Your
data allows allows me to tweak some of the
streamer loads values in much better too.
Please post any further data on such things you
come up with!! "I" am listening :-))) Be sure
to mention dwell times, current settings, input
voltage, etc. Since that is real important as I
pump your data into the computer. The pictures
also help a bunch in seeing the streamers and
guessing about parameters for the model!! I am
using a ruler on those pictures so it is nice to
know the distance from the terminal to the target
too. I have been able to figure all this out fine so far though.
The short streamers that miss the target have
little added capacitance so I model their
length. The streamers that hit need a new
function to add capacitance to bring them
"further" to the target. Having such precise data makes it easy ;-))
Cheers,
Terry
At 12:02 PM 6/13/2006, you wrote:
I?m presently performing a detailed analysis of
the tuning characteristics of a DRSSTC
system. I?m still in the early phases of this
particular task, but have come up
with some initial data of Primary Current and DC
Bus Voltage vs. Arc Length for various tuning points in a DRSSTC system.
This data was collected at 9 separate tuning
points (1/4 turn increments) on the primary coil
of a small DRSSTC system. A strike target was
placed beginning at 0.25? and increased
in two inch increments up to the maximum arc the
system was capable of. For this particular
system, 32? was the maximum arc, and was limited
by either the active current limiting
circuit which was set to about 550A and/or
secondary-to-primary arcing at which time the experiment was ceased.
Natural Frequency of Secondary with 13? x 4? toroid = 198kHz (Measured)
Coupling: Approx. 0.18 (estimated)
Primary Tuning Range (9.2uH to 5.3uH)
Natural Frequency of Primary Circuit (w/ 0.108uF MMC) (Measured)
9.2uH = 160kHz
7.9uH = 173kHz
7.7uH = 175kHz
7.2uH (I) = 180kHz
7.2uH (II) = 180kHz
6.2uH = 196kHz
5.8uH = 200kHz
5.6uH = 205kHz
5.3uH = 210kHz
Please note, there are two 7.2uH, but they are
actually ¼ turn from one another. There was
some fluctuation do to wire length / positioning
of the connection wires which attributed to this.
These inductance value were measured exactly how
the wires would connect to the full-bridge.
Initial Data:
Peak Primary Current vs. Arc Length
<http://www.easternvoltageresearch.com/tuningstudy01.jpg>http://www.easternvoltageresearch.com/tuningstudy01.jpg
DC Bus Voltage vs. Arc Length
<http://www.easternvoltageresearch.com/tuningstudy02.jpg>http://www.easternvoltageresearch.com/tuningstudy02.jpg
Daniel McCauley
<http://www.drsstcbook.com/>http://www.drsstcbook.com
CC: 4hV Newsgroup