Re: [TCML] Overdriving NSTs

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

I'm certain the voltage did not double.  If that were the case the
transformer would have let out it's magical blue smoke and ceased to
function.  It seems to me that most of the extra voltage is going directly
into current.  When I used the transformer to drive a Jacobs ladder the
result of pushing the voltage all the way up was that the arcs became much
hotter, and I was able to measure a small amount of current with my clamp
meter.  When I was running the Jacobs ladder I did not let the current on
the 120V side of the variac go over 20A  I it usually reached 20A around
210V.  I run my transformers in a sealed enclosure, and I opened this up
after overdriving them for quite some time and did not note the presence of
ozone.  Aside from the transformers being slightly warm the overdriving
didn't seem to affect them that much.  I probably ran the transformers at
200V+ for at least 30 minutes or so.  I'll try taking voltage measurements,
but with my primitive setup I can't promise any results.

On Sat, Jun 28, 2008 at 9:26 AM, Ed Phillips <evp@xxxxxxxxxxx> wrote:

> Hey Phillip...
>
> 200%??  you put 240Vac into it?  ouch  you lucked out this time...probably
> wont be so lucky the next time around...good chance you stressed the
> insulation on the secondaries of the NST ...
>
> Scot D
>
>
> Phillip Slawinski wrote:
>
> I just hooked my NST up to the Tesla coil and ran it up to full (200%)
> voltage.  WOW!   :-D   Three foot sparks, maybe unimpressive to all you
> guys
> but for me that's something :)   I haven't made any attempt at tuning it,
> and
> I don't have all the parts yet.
>
> My point is that for the short time I overdrove the NST in tesla coil duty
> didn't destroy it immediately"
>
>   Doubt very very seriously that the output voltage doubled.  If someone
> had the ambition he could run a curve of output voltage AND LINE CURRENT! vs
> input line voltage up to the input voltage where the core saturated.  Runs
> of a few seconds wouldn't overhead the primary windings enough to do damage.
>  Results would be interesting.  I would think the results would be just
> about universal, for NST's at least, because the guys build them for a price
> and won't waste any money on extra iron or turns.
>
> Ed
>
>
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