Re: calculating safe primary turn-to-turn distance

["Jeroen Kooiman" <jkooi@wish.net> (by way of Terry Fritz <twftesla@uswest.net>)]

Hi Stan,

It will problably arc over between the primary turns if :
the voltage difference between the turns is high enough
to cross the space between the turns (about 1000 Volts/ mm)

So for intance : if you got 4 turns with 15000 Volt, that would be 3750
Volt/turn, so that make it aprox. 4 mm as a minimal space between the turns

regards
Jeroen Kooiman, Holland
Web page : http://www.crosswinds.net/~jeroenk



----- Original Message -----
From: "Tesla list" <tesla@pupman.com>
To: <tesla@pupman.com>
Sent: Saturday, August 26, 2000 7:43 AM
Subject: calculating safe primary turn-to-turn distance


> Original poster: "Stan" <sdarling@columbus.rr.com>
>
> Greetings all,
>
> I have been curious since I started doing Tesla coils about this:  how
> does one calculate the minimum air distance of turn to turn spacing in a
> primary for a given voltage?  I'm not an EE so my common sense tells me
> that current always favors the path of least resistance and that even a
> tiny distance of air would have a much greater R than the adjacent half
> turn of Cu tubing. So if the adjacent turns weren't touching, why would
> it ever arc over through the air?  I suspect it has something to do with
> the inductance of the Cu tubing coil(s) ....
>
> Feeling stupid in Ohio.
>
> -Stan
>
>
>
>