RE: [TCML] quick secondary/primary spacing question

[James Hutton <b-u-r-t-o-n-boy@xxxxxxxxxxx>]

I'm using two 15kv/60ma nst's so I made it 1.75inches, which will give me just enough copper tubing. Thanks for the help!-James


> Date: Mon, 23 Apr 2012 20:37:34 -0700
> From: jimlux@xxxxxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] quick secondary/primary spacing question
> 
> On 4/23/12 7:18 PM, James Hutton wrote:
> >
> > I have a 5.5inch secondary. could someone suggest a minimum inner primary diameter?I am running low on copper tubing, but at the same time i dont want sparks from the primary to secondary.thanks :) 		 	   		  _______________________________________________
> 
> I've used somewhere between 1/2 inch and 1 inch.  You can always get 
> more clearance by raising the secondary a bit..
> 
> The voltage between the bottom of the secondary and the inner turn of 
> the primary is on the order of half the NST voltage (you're using an 
> NST, right), so call it 10kV.  If your secondary is 1000 turns and 
> you've got 300kV on it, that's about 30kV/100 turns, which is a couple 
> inches up on the secondary.
> 
> breakdown in air is 70kV/inch, and you want to stay, say, 1/3 of that if 
> you can.  figure out the distance and see how it looks.
> 
> Doesn't one of the tesla coil modeling codes also tell you want the 
> field is?  keep the field less than 10-15 kV/cm and you're probably ok.
> 
> 
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