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Re: [TCML] Voltage - Gap
Interesting,
Thank you John and Gary for your responses in particular.
So, It would require direct measurement to determine which notch the gap is quenching on. Something I can do after I am done the coil. But I could also directly measure the dwell time from that as well.
But it does not really help me right now. This is still all part of my trying to write a program to aid in MMC design. Of which the RMS current is an important factor. So I will have to rely on an estimation. I think its save to assume that we are not really going to ever go beyond 3 energy transfer periods. So one could make a good estimation on the dwell time solely based on the time for one period of total energy transfer X3. This would be the maximium theoretical it could be. Unless I am wrong on that.
At some point in the near future I will do the math and see if the time between the initial conduction set by the breakdown voltage of whatever it is in air and the the electrode moving away from the stationary electrode and the total energy transfer time x3 are at all comparable, if so then it might make a good estimation. if not then I will need to find something else.
Thanks,
John "Jay" Howson IV
"Why thank you, I will be happy to take those electrons off your hands."
----- Original Message -----
From: "Gary Lau" <glau1024@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, January 29, 2012 5:27:09 PM
Subject: RE: [TCML] Voltage - Gap
I believe that the on-time of a gap, be it static or rotary, is determined strictly by the time it takes the primary/secondary systems to achieve quench. It will be difficult to incorporate this into a program, because factors affecting quench itself are not fully understood and is dependent on streamer loading and whether streamers connect to targets.
I know that the arc observed between RSG electrodes occurs as the rotating electrode *approaches* the fixed electrode. The fact that there is an existing cloud of hot ionized gas from previous bangs probably helps make this arc longer than it might otherwise be. I think that it's unlikely however that the arc is on long enough that it will draw the arc as the moving electrode is moving *away*. Under most circumstances, the system would have achieved quench long ago, independent of mechanical alignment.
Regards, Gary Lau
MA, USA
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of jhowson4@xxxxxxxxxxx
> Sent: Sunday, January 29, 2012 4:23 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Voltage - Gap
>
> Taking this discussion more off topic and creating a new thread .
>
> I have recently been thinking a lot about how the spark behaves within the gap.
> Does anyone have any material for how far an arc can be drawn in a rotary spark
> gap.
> I am trying to write an equation to estimate this for use in my program, as it will
> help me determine the "on time" and by extension the overall RMS current of the
> primary circuit.
> >From what I understand, unless your capacitor is close to resonant with the power
> supply (like in drawing monster arcs from mots) the sparks are rather short, at least
> when compared to what you could draw just directly from the main transformer
> anyway. This has something to do with with the fact that when the capacitor dumps
> its energy threw the gap its voltage falls rapidly in an oscillating exponential decay.
> But I have not been able to quantify any it yet.
> I will do some tests when i finish my coil to get exact numbers. But has anyone
> thought about this at all?
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
<Snip!>
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