Re: Win tesla

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <k.schraner-at-datacomm.ch>

Hi Bart,

looking at your little table, everything was easy, except the last 
column. It appears, a really little, trivial error has occured, in being 
the second last column "Arc Voltage" MULTIPLIED by the "Total Gap 
Distance", instead of DIVIDED by it. Opposite to experience, bigger 
spheres, in this case would lead to lower breakdown voltage. A corrected 
table would look 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
  5       0.125         8         0.022       0.178	8,823     49,569

...where I've added case 5 for an approximation to the original question 
of Allanh, assuming a small electrode radius of 0.125". Might it be, the 
8.7kV/inch, floating around in this tread, was in fact stemming from the 
little error mentioned above? - Or taking the "Arc Voltage" as the 
"Voltage per inch" ?

Cheers, Kurt

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...
>
>
>