My deepest condolences for your loss. I know it's JUST a secondary coil, but
as a fellow coiler, I most assuredly feel your pain. On the bright side, at
least you did manage to capture some truly spectacular footage of this
secondary coil mishap. I have had this happen on rare occasion with the
operation of my big coil, though fortunately, none of my mishaps turned out
quite that severe! Only once did I actually have to repair some damage to
the side of my coil and was able to get it back into full functioning mode
via the repair. Since I must operate mine outside, I did have one occasion
where the wind actully "blew" one of the streamers back into the side of my
secondary coil, too. Lesson learned - although refraining from outdoor
operation during rainfall is an obvious good rule, non-starters in windy
conditions are also well advised.
I suppose this is a risk, that although may be small with a well-tuned and
efficiently operating coil, is never completely absent. :^/
David
----- Original Message -----
From: "phil" <pip@xxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, July 04, 2018 8:48 AM
Subject: [TCML] Bad strike to a 12 inch traditional coil (somewhat terminal)
This recently occurred to Phil S's 12 inch coil that on the day in
question, and also the previous day, had ran fine. Tuning had been done
with an oscilloscope, and the coil was not considered over-coupled. The
winding had though sustained previous damage which had been repaired a
year previously, however this latest damage did not appear to align with
where the previous splice had been done, and as mentioned, it had already
had some higher power runs that day.
As you will see there was already a streamer strike "in progress" (so as
to speak) from the toroid down to the primary strike-ring when the 1st
secondary flash-over up the winding occurs. This finished around 30m/s+
later and then a second flash-over occurs fairly soon after.
This time however the ongoing toroid-to-strike-ring streamer (which had
started 0.5 second or so before the 1st flash-over) now forks over to join
the secondary flash-over. Then the fun really begins!
Were these flash-overs a result of the initial strike to the strike-ring,
or just coincidence?
Initial thoughts were it looked like so called 'racing sparks', but they
did not initially extend up the winding very far, so jury is still out.
Coil is 100 bps SRSG using a phase controller.
Phil T
(Luddite Coiler UK)
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