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Re: [TCML] Secondary Damage (Large Coil)
Dear Amir Mojarradi
First of all i have to excuse for my bad english.
I once saw another coil on the internet with the same problems. They finally found out that the Tap of his Strikerail caused this Problem. The direct ground connection influenced the electromagnetic field in a bad way and caused this problems.
Are your strike points at the side of your strikerail tap?
This problem also occures when you're running a coil with too much input power.
Those points are very hard to repair. If a streamer strikes out one time, carbonate is created and will create an conducting point.
If possible you should grind this point and re-isolate it.
Another gimmick is to breathe at your coil. Your coil will steam up and you can see if there are any other damages at your coil.
Greetings
dga
________________________________
Von: "bturner@xxxxxxxx" <bturner@xxxxxxxx>
An: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Gesendet: 5:50 Donnerstag, 12.April 2012
Betreff: Re: [TCML] Secondary Damage (Large Coil)
Over-coupled??? Could be a spurious standing wave or something.
>
> Hello Everyone,
>
>
> My large secondary coil (12" diameter, 60" in winding length, 18 awg) has
> repeatedly exhibited overarcing at two specific points. A few months ago,
> I messaged the list, and decided to thickly re-varnish the damaged areas.
>
>
> Unfortunately, the problem has returned at the same two points. Since I am
> far away from the coil when I run it, I can not precisely determine the
> cause of the problem. From my research, I can infer two possible
> explanations.
>
>
> 1. Insulation (varnish and wire enamel) is exposed and/or damaged; there
> is arcing between two turns of the coil.
> 2. Insulation (varnish and wire enamel) is exposed and/or damaged; there
> is a premature breakout from a single turn of the coil.
>
>
> Below are pictures of the damage, to give a general idea.
>
>
> General Reference Image of the Secondary:
> http://www.flickr.com/photos/teslalightning/7068998821/in/photostream/
>
>
> Damage Point A:
> http://www.flickr.com/photos/teslalightning/7068998895/in/photostream/
>
>
> Damage Point B:
> http://www.flickr.com/photos/teslalightning/7068998945/in/photostream/
>
>
> Normal Coil Performance:
> http://www.youtube.com/watch?v=yjChcjVm5ks
>
>
> Any of these causes might necessitate a different solution. I am
> considering epoxying the damaged areas, using silver conductive epoxy to
> short out the arc, splicing the wires, or in the most extreme case, to
> re-wire the coil up to the damaged points and "surgically" soldering them.
>
>
> Would using a better insulating layer like Polyurethane or Epoxy help?
> What can I do besides re-wiring to solve this?
> Any related suggestions or comments will be extremely helpful, as any
> solution to this problem will require a meticulous undertaking.
>
>
>
>
> Thank you for your helpfulness and dedication to the hobby of coiling,
>
>
> Amir Mojarradi
>
>
>
>
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
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>
>
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