Re: [TCML] Secondary Damage (Large Coil)

[bturner@xxxxxxxx]

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
>
>
>
>
>
>
>
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>
>


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