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RE: [TCML] Corona Supression
Rubber is a poor corona suppressor...
If you're looking truly to suppress corona and not to offer safety in the vicinity, using conductive, round surfaces is your only good option. If there is even the SLIGHTEST amount of corona formation, pretty much all organic materials are out of the question (including rubber). The reason this is true is that the O3 (Ozone) is looking to lose that third oxygen atom in order to stablilize...
...rubber is more-than-happy to take it. When rubber oxidizes, it becomes very hard and brittle, as well as 'dry,' texture-wise.
I would have to say that using insulation on corona-producing instrumentation or equipment is akin to spraying 'febreze' on a pile of feces...it may make it so that you don't sense it for a while, but the problem is still there.
- Christopher Karr
> From: brandonhendershot@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Corona Supression
> Date: Sun, 16 May 2010 11:47:32 -0700
>
> I got a few bolts used as terminals I'd like to cover up. Some other
> structural nuts and bolts running close to wires I'd like to get some
> extra assurance on as well. I figured a round cap nut ought to
> suffice, but I prefer the idea of sticking on some rubber insulation.
> Any kind of rubber caps good for HV? I remember seeing something
> pretty fitting of the description in the hardware section down at home
> depot. It looked way too thin though...
>
> On May 16, 2010, at 10:33 AM, Christopher Karr
> <chriskarr4@xxxxxxxxxxx> wrote:
>
> >
> > Hello Brandon,
> >
> > May I ask what the intended use is (I.e. the potential you're trying
> > to suppress and the size of the connections which you're trying to
> > cover)?
> >
> > In my experience, corona suppression is as easy as:
> > - using too much solder and forming a 'blob' on the joint;
> > - using larger gauges of wire at connection points;
> > - after soldering, doing 'touch-up' work with sandpaper (various
> > gauges, possibly, and finishing with 400-grit);
> > - after smoothing out the free-air connection, insulating it with an
> > insulative varnish (perhaps even corona-dope).
> >
> > If you wish to test these, I recommend you use a highly-susceptible
> > joint and then use the method described. The joint, of course, being
> > a test-piece, as opposed to the actual part of the structure.
> >
> > Good luck!
> >
> > - Christopher Karr
> >
> >> From: brandonhendershot@xxxxxxxxx
> >> Date: Sat, 15 May 2010 20:38:34 -0700
> >> Subject: [TCML] Corona Supression
> >>
> >> There was a post I read a while back, don't remember what it was
> >> about, but someone had mentioned that they would eventually end up
> >> covering every little point that wasn't smooth with "corona
> >> supressing
> >> caps". Does anybody know exactly what these are and where I could get
> >> them and/or make them?
> >> Thanks,
> >> Brandon
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