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Re: [TCML] 1st Run
Geeze Miles, that sucks.
Could it really be the simple fact of the secondary wire entering the core caused that? I don't think your situation is exactly the same as mine. It could be anything - but the pattern of events is similar. And I started out with the "3 holes holding the winding" but later pulled the winding out of the holes and epoxied over the holes, plugged up the ends with 1/2" gray PVC. I found that some guys said, - "you must make the core airtight and you cannot have a winding turn penetrate the core," and other guys said it didn't matter that much.
I had arcs racing all over the outside of my 1st secondary and things got hot.
In my case, after a lot of analysis and taking of absolutely sound suggestions (reducing the coupling, coating with sealant, etc.), it turned out I had measured the resonant frequency wrong. I was off by about 2x. If I had been in undergrad linear circuits lab, I would have failed that test miserably.
After I retuned to what JavaTC suggested, I got no more racing arcs even after I put the secondary back where it was in the first place (thereby increasing the coupling) and everything ran cool again.
I'm sure your situation is different, but the parallels in what happened are interesting. I was actually able to use my secondary even though the insulation had burned off a couple turns - I had taken RLC measurements prior to the "incident" and they were the same afterward, so I presumed no turns were shorted- or that not enough of them shorted to show up on my B&K meter. Or, most likely, I'm just lucky.
Best to you.
Joe
On Jul 18, 2010, at 12:58 PM, Miles Mauldin wrote:
> 1st Run, not so good. Was really looking forward to seeing my work come to
> fruition but it was so short lived I didn’t even have a chance at the camera.
> On the first run I saw more than a dozen 15-18" streamers all around the top
> toroid, that was taping around the 9th turn. I didn’t realize how hot the
> primary would get. I could not touch the clamp on the primary for several
> minutes. Everything looked great at this point. I tuned a half turn in and
> started another run at about 60% power but didn’t see any streamers at all. In
> fact I started smelling something burning. At that point I turned everything off
> and found the source of the smell on the far side of the coil from me. The
> secondary had a catastrophic failure internally. Photos here ->
> http://www.cmnow.com/TeslaMan/1stRun/
>
> I guess I’m going to be winding another secondary but this time with a different
> design; I truly believe the design caused my failure and not some contaminate
> within the PVC tube. So maybe the correct design for a secondary coil is to not
> have any “ANY” external connections to the windings internally to the coil form.
>
> Best thing I can say about last night; Mr. Butters didn’t make a show….
>
> Next is always better.
> Miles M
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