[TCML] Maxwell 31173 fail
glau1024 at gmail.com
Sat Feb 12 17:47:24 MST 2011
I've never heard anyone suggest this as a failure mechanism, but might be
worth thinking about. I can't be sure I'm seeing it correctly, but it
appears that your cap was positioned broadside-up, just inches (?) below the
primary coil. Is it possible that the primary field was inducing eddy
currents into the cap's foil plates, and that may have contributed to
BTW - beautiful secondary and topload. Glad nothing happened to them!
Regards, Gary Lau
On Sat, Feb 12, 2011 at 11:23 AM, Joe Mastroianni <joe at killerowls.com>wrote:
> New resonator <http://www.flickr.com/photos/iceowl/> and topload
> Yes voltage reversal. Yes maximum pulse rate. Of course.
> One learns about these things, then forgets, then relearns after the
> catastrophic failure. The wife said, "Look, smoke," and I said, "@#$(!"
> Like others before me, it took some number of measurable seconds to shut
> everything down, during which time the coil continued to operate "normally"
> even with it's guts spilling out.
> The cap has been working swimmingly in with the new resonator and pole pig
> power supply (being run above it's 5kVA rating at about 9kVA). ARSG running
> at around 300bps. Of course, unhappy with stasis, I began tweaking the
> tuning. Why? Oh, because. JavaTC had given me a precise number, I tuned
> to it, everything was hunky dory, and then I tried to change it, just to see
> if things would get "better". They didn't.
> I tried setting various breakout points. They worked.
> I tried running without breakout points. It was much more dramatic, though
> the arcs hit the primary , and I got a couple ground strikes which killed
> the rectifier running the ARSG DC motor.
> (By the way - this happens ALL the time. Ground strikes trash my 30A
> rectifier running a 90VDC 1.5hp treadmill motor. That takes out the fuse in
> the variac running the motor, and the now powerless motor starts slowing
> down. If I am not vigilant, the RPMs can change dramatically before I can
> hit the panic button. I've been discussing this with Dave Leddon, who
> notes it is a common issue in this kind of coiling. If anyone has a "fix"
> for this phenomenon - I am ALL ears. My fix is to keep a box of 50
> rectifiers and 50 12A fuses around. I've gotten to where I can replace
> everything in about 90 seconds - but it's such a pain.)
> I tried jury rigging a strike rail - at which point I learned that jury
> rigged strike rails placed too close to the primary become little resonators
> of their own. Ok, bad idea, Joe.
> Then, the wife came home from work and saw she couldn't park the car in the
> driveway. She said, "What I great way to come home to a lousy day at work!"
> and really meant it, which is why I love her and married her as soon as I
> could. She was all smiley and giggly, because the coil topload looms over
> her now at a height of about 8.5" (she's short), so when we are prone to
> flights of whimsy it seems we've really built some sort of very important
> reality-warping machine. She needed some sparks as much as I did, so I
> fired up the coil and started messing with the ARSG speed.
> I sped it all the way up to the max RPM - watching the sparks fade to
> nearly nothing, and then slowed it down. Spark size maxed at about 2400rpm
> (1/2 speed which = 300bps), and then just for the halibut I slowed it down
> even farther. There was no effect at lower BPS rates, and higher or lower
> voltage settings, right up until the wife said, "Look, ahhh!"
> There was a rather large puff of brown-gray smoke. The coil kept
> sparking, and it was at least 2-5 seconds before I realized what was
> happening and the panic button killed the power.
> The capacitor (as you can see from the pics) exploded through its casing.
> It was a steaming hunk. Very warm - clearly internal stresses from heating
> caused some expansion. There was oil oozing all over.
> Well, maybe this is a sign it's probably time to start on my DR power
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