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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...
> >
> >
> >