Re: [TCML] Corona Supression

[DC Cox <resonance@xxxxxxxxxxxx>]

Usually a small plate of 1/8" acrylic will prevent this type of damage.
Just let the plate stick out all asround above the caps by 1/2 - 3/4".

If you assemble with any fasteners make sure they are nylon not steel.

I finish up both ends of all my coils, small and large, with 1" wide Teflon
tape.  About $50 per roll online EBay.  2-3 layers, continuous, on each end
really helps prevent corona and flashovers.
Cover the coil itself with 3-4 coatings of Dolph's AC-43 and allow to dry 24
hrs. between each coat.

Dr. Resonance






On Tue, May 18, 2010 at 5:10 PM, Brandon Garretson
<garretsontech@xxxxxxxxx>wrote:

> Id say its about as stretchy as a high quality electrical tape but
> about twice as thick.
> It tends to want to return to its original length after stretching
> unless you press it down against itself.
> Once it has been terminated it remains stable, it doesnt seem to want
> to unravel over time.
> Both sides are identical so all termination requires is pressing the
> end onto any part you have already applied.
> I dont think applying dielectric grease before hand is a good idea, it
> may liquefy if it gets hot and leach between the layers of tape
> through capillary action, then the tape would lose its bond.
> Its only a few bucks a roll but I would be more than happy to mail you
> a sample if you want to check it out, you can send me your address
> off-list if you like (garretsontech@xxxxxxxxx).
> I personally cut all bolts and screws and grind them smooth so they
> are even with or shorter than whatever they thread into.
>
> I too have experienced similar anomalies as Shannon.
> I use 12K trannys and I burned a carbon trace through the framework of
> my coil from the MMC to the primary because the terminal of the cap
> was less than an inch from the plywood.
> It went through 8 horizontal inches of 5/8 plywood to get to the part
> of the primary bent downward and through to attach to the spark gap.
> The only thing that stopped it was a piece of silicon pot holder I cut
> and stuck between the cap and the plywood.
> I have since rebuilt the MMC and the terminals are now on the sides.
> I also had a porcelain insulator explode because I used a steel screw
> through it to hold up a strike rail.
> It was close enough to the primary (still inside the insulator mind
> you) that it didnt care what was in its path, it just blew a hole
> right through it. There may have been moisture in it the porcelain but
> I still couldnt believe it.
> Regardless of whether or not 12 or 15 kilovolts is really "high
> voltage", it can be surprising to see how it has a mind of its own.
> I guess when you try to jam a whole bunch of stuff in a small package
> thats just what happens.
> Im completely rebuilding my coil because of issues like that and you
> cant expect your first coil to be free of them.
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