Re: autotransformereffect

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Chris,

I would account the safety gap firing related to electrode heat rather than
autotransformer action. If it was due to the outer turns, shouldn't it
occur right away
and not after 30 seconds of running? When you turned the power down to 90%,
it most
likely indicates a voltage decrease and a balance between electrode heat,
voltage at the
gap, and gap distance.

Take care,
Bart

Tesla list wrote:

> Original poster: "cd by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<vbprg1-at-hotmail-dot-com>
>
> ok let me ask a quick question
> I have been told that since i built a large 20 turn primary and I am taping
> it at the 9th turn 11 turns hanging out untaped each one bigger than the
> last.
> I am wondering..
> When I run the coil after about 30 to 60 seconds
> I start to get shots across the safety gap
> untill I turn the power down to about 90 percent..
> I have been told that
> some of the over sparking in the primary outer turns is due to
> autotransformer effect voltage building up in the unused turns...This is
> pretty apparently sometimes the cause of sparks jumping across the safety
> gap, but I am getting fires in the safety gap without over sparking of
> anykind in the outer turns...
> So I am wondering is the auto transformer effect creating the voltage surges
> that fire the safety gap or is there some kind of increase in voltage during
> the operation of a coil???
> Some kind of secondary to primary feedback loop????
> Im just talking about when
> the safety gap is firing without outer turn over sparking and no association
> with strikes to primary or strike rail...
>
> it only seems to happen after I have run the coil for at least 30 seconds
> leading me to believe some type of voltage buildup is fireing the safety
> gap....
>
> *a note the safety gap will not fire at all on the nsts alone...and is
> widened a bit more than just a hair from when it would fire... so they are
> probably large voltage surges or increasing voltage build up untill it
> fires...
>
> Kinda wierd actually... thought I had it all tuned right....
>
> Thanks
> Chris Dowdy