Re: nst went boom :-)

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

Original poster: "Alex Crow by way of Terry Fritz <twftesla-at-qwest-dot-net>" <alexcrow-at-blueyonder.co.uk>

Frank,

You may be lucky and it's only the tar shorting out the secondary winding, 
but I think you may have damaged the insulation on the wire itself at that 
kind of voltage.

When you series transformer windings, it does not halve the current. The 
current capability of 200m of wire is the same as 100m, plus even though you 
have double the inductive reactance you also have double the voltage, pushing 
the same I. If you parallel the windings, though, you will get twice the 
original current and half the voltage.

The resonant mode is now falling out of favour for precisely this reason - it 
tends to kill NST's if you start setting the gap 'a little wider', although 
your case is very extreme. I think you were getting about 100kV there!

Cheers,

Alex

On Friday 30 November 2001 7:24 pm, Tesla list wrote:
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <PsychoticMinds1-at-aol-dot-com>
>
>
>
>          Hi everyone.  I was running a ltr on my first coil wich was a mini
> and i wasnt satisfied with the sparks so i modified my cap bank to resonant
> and set the spark gap to and inch and a half i knew i was goin to blow the
> tranny but i needed BIGGER SPARKS :-)~ .  To my amazment i ran the
> transformer for almsost 2 hours strait showing ppl it (had to stop 5 times
> to replace the electrodes on the gap though) b4 the nst desided to die i
> was very inpressed with my little transformer.  Im now in the process of
> depotting it when i have it out of the tar what should i look for to
> attempt to fix it? i only get an arc for half the nst and another question
> if when i re assemble it if i wire the 2 halfs of the nst in parallel
> instead of in series will i get 4x the current cause when u series them you
> cut there current in half and if i was to pallalel them i would undo the
> half current thing and then double it..Am i really off o! n this i dea ? 
> if i am im sorry. Thanx in advance to everyone that responds.
>
>
>                                  Frank