Hi Phil,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)
Gents & Lassies Slightly odd one, with a video at: https://youtu.be/tcESWWbcr7IThis 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) _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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