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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