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Re: TC Secondary Terminal Design


  DR.RESONANCE -

  As I mentioned in the post "Couture's Equation" is not a precise solution.
It is assumned that the sphere capacitance is large enough so that the
secondary inductor's capacitance can be ignored. The equation gets you in
the ballpark. It has the advantage that it takes the voltage and wattage
into consideration unlike other solutions.

  John C.

-----------------------------------------


At 04:17 PM 11/21/98 -0700, you wrote:
>Original Poster: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net> 
>
>to: John
>
>Is Cs the total capacitance of the secondary system or just the capacitance
>of the high voltage terminal?  If so, I presume you have included in your
>equation some device to estimate and subtract the secondary inductor's
>capacitance.  
>
>DR.RESONANCE-at-next-wave-dot-net
>
>
>----------
>> From: Tesla List <tesla-at-pupman-dot-com>
>> To: tesla-at-pupman-dot-com
>> Subject: TC Secondary Terminal Design
>> Date: Friday, November 20, 1998 4:34 PM
>> 
>> Original Poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net> 
>> 
>> 
>>   All -
>> 
>>   Finding the proper size secondary terminal has now become easier when
>> using a new(?) equation that I have derived from several theoretical
>> equations. This is not a precise solution but does get you a ballpark
>figure.
>> 
>>  The sizing of the secondary terminal capacitance is part of the tuning
>> process and must satisfy the  Lp Cp = Ls Cs  equation. However, the size
>is
>> also determined by the input voltage and wattage. When the input voltage
>or
>> wattage is increased the secondary terminal capacitance should be
>increased.
>> 
>>   The equation I derived to do this is as follows:
>> 
>>       Cs = 12.34 * cuberoot(KVp^2 * Cp)
>> 
>>      Cs in pf      Cp in uf
>> 
>>   Note that Cs in this equation is based on input voltage and  also on
>the
>> input wattage when  
>>   Cp = J/Vp^2  and  J = Input watts/ Breaks per second
>> 
>>   The equation is derived assuming the following:
>> 
>>   The secondary terminal is a sphere and
>> 
>>   Cs (pf) = sphere dia * 1.41    
>> 
>>   Secondary kilovolts = sphere dia * 32.5   
>> 
>>   Sphere breakout is 65 KV per inch radius 
>> 
>>   KVs = KVp * sqrt(Cp/Cs)
>> 
>>   When the secondary capacitance is found the approx. sphere dia can be
>> found by subtracting the sec coil self cap from the secondary
>capacitance.
>> 
----------------------  snip
> 
>>   John Couture