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RE: Induction heating in toroid / short circuit of secondary

Hi Steve,
Thanks for the thoughts.

The problem with filament lamps is
 they respond to average current (power).

The TC puts out huge peak short duration power. (my arc's <400nS 20-100A)
One bang would not have sufficient average power to light the lamp.
(those TC's that do, get higher avg power via high bang rate)

Especially w/my battery powered manual controlled
 single shot DC TC I use for instrumented measurement.

It produces one 28" point to point power arc once every ~3 to 5 sec's ! 
but consumes <1 watt from the battery !

My interest in the topload is more on its influence to the fields,
mechanisms and dynamics involved in the shielding process 
(eliminating corona, inner turn arcing, etc.)
And the seeming in-different affect between use of 
  open (aiding/opposing turn) and
  shorted turn toroid's.
though consumption of power is surely an indicator 
 (like the spark between open ends)
especially in my implementation
  examining each individual power arc.

Being a Ham myself I've use many an incandescent as a cheap dummy load.
Be aware that tungsten filaments have a very nonlinear resistance, (10X?)
being very low when cold, increasing rapidly as they heat up !

LED's may have potential for this application.
 They are fast, 
 our eyes posing the limit re: poor intensity judgement,
 but could be a valued window as to what's going on in there.

Regards, Dale,  K3MNN

-----Original Message-----
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, December 25, 1999 7:56 AM
To: tesla-at-pupman-dot-com
Subject: Re: Induction heating in toroid / short circuit of secondary

Original Poster: "Steve Young" <youngs-at-konnections-dot-com> 

Dale, Kennan et al,
I'll intersperse a comment under your interspersed comment below:
Subject: Re: Induction heating in toroid / short circuit of secondary
> Original Poster: Kennan C Herrick <kcha1-at-juno-dot-com>
>
> Dale-
> I'll intersperse a few comments.

<SNIP, SNIPPITY, SNIP> (Terry, take note!)

> >    That's why I checked for arc production between the open ends,
> >    to check for significant induction.
> >    Ends arced, so it appears there is !
> >         or can you present another mechanism responsible ?
> >
> That might offer a handy way to check for t.c. power output:  Just insert
> a meter there!  Or better still--try connecting a meter across the
> diameter of the toroid, measuring the voltage there.  Or maybe a few LEDs
> or even a little battery-operated LCD panel meter suitably rectified.
> Endless possibilities!

The idea is to see what power gets wasted heating the toroid.  Consider
this:  If you hook a small flashlight bulb across a toroid gap, and you get
no or little glow from the filament, then very little power is being wasted
in the torroid.  On the other hand, if a 100 watt light bulb burns out, then
we have a torrid torid, and we should all think about using gapped toroids.
One could use various sized bulbs, starting with higher wattage and working
down, to roughly determine what power is coupled into the toroid.  You might
have to tuck the bulb inside the torroid, so it can be seen through the gap,
to avoid arcs from the bulb which will destroy it.  (In the world of RF
oscillators, which our TCs are, the light bulbs are called dummy loads.  I
think this refers to the load itself, not the person using it!)

If some of you try this experiment, please share the results.

Happy Y2K, Steve Young