Re: [TCML] quick secondary/primary spacing question

[Matthew Edwards <matthew.n.edwards@xxxxxxxxx>]

I feel like I'm repeating myself :-P but have you tried Javatc? It will give you a good idea of minimum spacing

Matthew Edwards

On Apr 23, 2012, at 9:11 PM, James Hutton <b-u-r-t-o-n-boy@xxxxxxxxxxx> wrote:

> 
> 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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