RE: [TCML] primary & power input

[david baehr <dfb25@xxxxxxxxxxx>]

Thank you for the info ,  scrap the .022"   idea
 > Date: Sun, 13 Jan 2013 12:44:32 -0800
> From: jimlux@xxxxxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] primary & power input
> 
> On 1/13/13 11:54 AM, david baehr wrote:
> >
> >
> >
> >
> > Hello,     On a primary for my little conical  sec  coil , I  want to
> > go with the banded type.                  Georgia Copper  has  .5"
> > wide  ,   .022" thick  copper ground strap . Would this be adequate
> > for  2   kw ?
> 
> If the edge is radiused (you'll have to do this) and has 0.011 inch 
> radius, the field at 20kV would be 20/0.011 kV/inch or 1800 kV/inch. 
> Considering that air breaks down at about 70kV/inch, corona is going to 
> be a *significant* problem with something that thin.
> 
> With, for instance, 1/4" OD tubing, the radius is 0.125, so with 20kV 
> from the NST on it, you have 20/0.125 = 160 kV/inch.  While more than 
> double the breakdown in air, most people don't have a big problem at 
> that voltage (probably because having adjacent turns close by with a 
> voltage that is a few kV different makes the overall field "smoother".
> 
> But going to 10 times the field with your thin strap is looking for 
> excitement.
> 
> 1/8" thick strap might work fairly well, is still bendable, etc?
> 
> 0.022" is going to be about awg 22
> 
> 
> SKin depth calculator:
> 
> http://www.microwaves101.com/encyclopedia/calsdepth.cfm
>    (copper is 1.67 conductivity, frequency is 0.0001 GHz)
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