[TCML] quench times again
Barton B. Anderson
bartb at classictesla.com
Wed Nov 21 19:41:31 MST 2007
Chris Swinson wrote:
> Hi all,
> I was looking at http://www.richieburnett.co.uk/wavefrms.html real
> looking at the discharge waveforms. The spark has arced to ground and
> killed all the voltage even before it gets to the first notch. So if
> the coil arcs on the first ring up cycle then all the RSG times and
> notches are meaningless really ?
Kind of yes. An arc to ground allowed all the energy to transfer in the
first 1/2 cycle (a few microseconds). It's all over but the shouting!
> It looks like the voltage just ramps up to maximum then arcs to
> ground, that's it..
Yes, but the energy transfer is still performing it's function until all
the energy in the cap is dumped.
> though looking at the previous waveforms, Richie has the 3rd notch as
> the quench time. There is no spark output so the energy is just
> trapped until (for what ever reason) the spark gap turns off at the
> 3rd notch.
No, there is output. It's in the form of a moderate lower power corona
off the toroid and these are in single shot mode to specifically
demonstrate quenching. The gap continued conducting until the energy had
been used up in the corona, secondary, and spark gap. Also realize these
are "secondary" waveforms, so the peaks indicate the primary side
notches. But yes, 3rd notch quenching in this case. No different than
sparking into the air in your garage.
> To me it looks like the notches are not important if the spark has
> output long before anyways....
I would not draw that conclusion. There was corona during the event. The
notches are an indication of energy consumed over time. There will be no
repeatability until enough energy has been consumed and allows the gap
to stop conducting. The longer the energy is stored in the system, the
greater the losses will be from bang to bang due to gap losses,
secondary losses, and spark output drain. Less transfer losses means
more energy in spark output. Sparks to objects will drain the system and
allow 1st notch quenching as the output then has a low impedance path
and will suck up all the energy stored in the secondary and topload.
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