Re: sparks running down secondary - why?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Antonio, All,

Paul Nicholson has just made a movie that shows the voltage along the
secondary during a gap firing.  I think the coupling is .11 but I have
asked him if he can redo it with a much higher coupling.  There is a third
harmonic effect that may make high voltage areas on the secondary and thus
promote the racing arcs.  Still more to do before that is verified but the
movie is fascinating to those interested in such things.  It is 1.4M bytes
MPEG:

http://hot-streamer-dot-com/temp/tfsm2-p[1].mpeg

Perhaps this work will finally unlock this racing arc mystery...

Cheers,

	Terry




At 07:04 PM 5/29/2001 -0300, you wrote:
>Tesla list wrote:
>
>> Original poster: "Paul Arrowsmith" <p_t_arrowsmith-at-hotmail-dot-com>
>> 
>> Sound like the primary and secondary are over coupled causing excessive
>> mutual inductance, try raising the secondary to make greater separation to
>> the primary turns lowering the coefficient of coupling.
>
>The problem is related (by not yet clear reasons) to the small distance
>between primary and secondary.  The suggested solution is correct, but
>I don't see a physical reason for a high mutual inductance causing the 
>"racing sparks" phenomenon.
>
>Antonio Carlos M. de Queiroz
>
>