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WinTesla Equations Version 5.5



Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Rscopper-at-aol-dot-com>

Looks to me like no one really knows what the correct equation should be.  If
we all decide on one I'll put it in WinTesla Version 5.5.  There's quite a bit
of work to do on the rotary spark gap section anyway.  8400V/in was good at the
time I wrote Version 3.2 over 2.5 years ago.

R. Scott Coppersmith 


In a message dated 10/24/2002 11:07:28 AM US Eastern Standard Time,
tesla-at-pupman-dot-com writes:



>
> Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <k.schraner-at-datacomm.ch>
>
> Hi Bart,
>
> having a look at your little table, everything seemed easy, except the 
> last column (=Volts per inch). Following this column of the table, 
> bigger spheres would lead to lower breakdown voltage, which is contrary 
> to experience. Then I discovered a really trivial error in your 
> table-calculation, as can happen to everybody: in your calc's the 'Arc 
> voltage' of the second last column, is MULTIPLIED by the corresponding 
> 'Total Gap Distance' instead of DIVIDED by it, as it should be. If 
> corrected, your table looks like:
>
> (fixed width font)
>
>         Electrode   Electrode   Per Gap    Total Gap    Arc        Volts
> Case     Radius"     "Gaps"     Distance"  Distance"   Voltage    per inch   
>
> ----    ---------   ---------   --------   ---------   -------    --------
>   1       0.125         8         0.125       1.00      16,535      16,535
>   2       0.1875        8         0.05        0.40      16,578      41,444
>   3       0.25          8         0.04        0.32      16,495      51,548
>   4       0.5           8         0.033       0.26      16,751      64,426
>    0.5           8         0.033       0.26      16,751      64,426
>
>
> which seems more plausible. Might it happen, the 8.7kV/inch, leading to 
> this thread, were a consequence of the above error as well?
>
> Tesla list wrote:
>
> >Original poster: "Barton B. Anderson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
> >
> >Hi Allan,
> >
> >Here's something for you. A 12kv NST is ~17kVp. So, shoot for that range
> using
> >the North equations provided in previous post and adjust the total gap
> distance
> >for each electrode size. In the following table, I simply adjusted the total
> >gap distance to attain ~16.5kv. In any case, whatever you are looking to
> shoot
> >for (arc voltage), the North equations will get you in the ball park. In the
> >cases below, electrodes are assumed the same size and spherical in shape,
> but
> >would be close for pipe gaps. Because there are other considerations
> within the
> >gap environment, they are only ball park figures.
> >
> >(fixed width font)
> >
> >        Electrode   Electrode   Per Gap    Total Gap    Arc        Volts
> >Case     Radius"     "Gaps"     Distance"  Distance"   Voltage    per
> inch    
> >----    ---------   ---------   --------   ---------   -------    --------
> >  1       0.125         8         0.125       1.00      16,535     16,535
> >  2       0.1875        8         0.05        0.40      16,578      6,631
> >  3       0.25          8         0.04        0.32      16,495      5,278
> >  4       0.5           8         0.033       0.26      16,751      4,355
> >       
> >Equation used:   arc voltage = 3000000*4*d/(d/r+1+sqrt((d/r+1)^2+8))
> >d = total gap spacing (meters)
> >r = electrode radius (meters)
> >
> >Convert d and r to meters for equation.
> >inches to meters = inches/39.37
> >meters to inches = meters * 0.0254
> >
> >Note case 1 has a high volts/inch value when r is small compared to d. 
> >Note case 4 (1" diam) might be better calc'd as a plane-plane gap (small
> d, big
> >r).
> >Note 8 "gaps" = 9 electrodes.
> >
> >Take care,
> >Bart
> >
> >
> >Tesla list wrote:
> >
> >>Original poster: "Allanh by way of Terry Fritz
> >>
> ><mailto:twftesla-at-qwest-dot-net><twftesla-at-qwest-dot-net>"
> >
> >><mailto:allanh-at-starband-dot-net><allanh-at-starband-dot-net>
> >>
> >>I originated this topic. I still think there is a problem with the WinTesla
> >>program, but it seems only Bart has understood my message. WinTesla states
> >>the answer in
> >>"in/gap", and for a 12000 Volt NST in gives an answer of
> >>" 0.178 in/gap" for 8 gaps. This number yeilds a total gap distance of
> 1.424
> >>inches, which is far too large. On the other hand, a single gap of 0.178
> >>inches is too small. I think you see my point.
> >>
> >>Thanks, Bart,
> >>
> >>allan
> >>
> >>----- Original Message -----
> >>From: "Tesla list" <mailto:tesla-at-pupman-dot-com><tesla-at-pupman-dot-com>
> >>To: <mailto:tesla-at-pupman-dot-com><tesla-at-pupman-dot-com>
> >>Sent: Monday, October 21, 2002 4:27 PM
> >>Subject: Re: Win tesla
> >>
> >>
> >>msnip....
> >>
> >>>     
> >>>
> >>>><mailto:allanh-at-starband-dot-net><allanh-at-starband-dot-net> I think we have
> >>>>
> >gotten off
> >
> >>>>track from my original question. The question concerns the gap size for
> use
> >>>>with a TC using various transformers. Given the fact that a 12 Kv NST can
> >>>>barely jump a 1/2 inch gap, why does the WinTesla program reccomend 1.43
> >>>>inches? If the gap       
> >>>>
> >
> >Msnip...
> >
> >
> >