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Re: Win tesla



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...
>
>
>