RE: variac size and flashover

• To: tesla-at-pupman-dot-com
• Subject: RE: variac size and flashover
• From: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 12 Nov 1999 17:09:14 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

>Original Poster: pmathus-at-learningco-dot-com 

>2 questions for the gurus:
     
>1)  How big a variac do i need? 5 amps?  15 amps? I'm going to be 
>running a 12kv 60ma NST.
 
With my 15KV/60MA NST, I pull over 20 Amps from the wall.  This seems to be
very high and atypical, but it is real.  My 15A Variac handles it just fine.
    
>2) What's the recommended distance between the first turn of the 
>primary and the secondary to prevent flashover?  I was thinking 2", 
>(for a 6" secondary) but now i'm wondering if that's too much. . .
 
1 inch should be fine, just make sure there are no sharp edges on the
primary to concentrate the e-field and precipitate a breakdown.  I've used
as small as 0.8" with that NST with no problems.
   
>thanks,
     
> paul mathus

Regards, Gary Lau
Waltham, MA USA

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