RE: [TCML] Corona Supression

["McCauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>]

Yes, that is a good point.  Remember, that coronal dope, or insulators don't really solve the problem.  The electric field gradient is still present, and in some cases made worst by the additional of the insulator, and is just prone to failure.

The best way of course is to always change the geometry and spacing of your equipment to reduce that field gradient.

As they say, "High Voltage always finds a way!"

Dan
http:/www.easternvoltageresearch.com
Beginner Complete SSTC Kits!


Hi All,

I've tried 69KV linerless splicing tape as dielectric for capacitors.  A 6KV NST blew right through.  Corona dope will not stop corona from the top turn of a coil.  I laid down 20 layers and still had a nice 15" diameter blue glow from the top turn of my 4" coil.  Corona suppression there requires the use of a large enough sphere or toroid/mushroom terminals.

I've also had primary circuits burn a track through 10 inches of canvas phenolic.

David E Weiss


> 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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