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Re: TC Secondary Terminal Design


  James -

  I have not tested this by changing the voltage. You apparently have found
that the voltages cancel out when the equations are combined. Very good
observation. But note that this assumes the capacitor is charged to the full
KVp.

  All of the equations I used are shown in the post.

  My hard drive crashed and I am in the process of trying to recover my lost
data so my replies may be delayed.

  John C.

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

At 10:31 AM 11/21/98 -0700, you wrote:
>Original Poster: "James" <elgersmad-at-email.msn-dot-com> 
>
>
>Have you tested this by changing the voltage, and measuring the change?
>Where did you get the equations?
>
>James.
>
>
>>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 capacitanc

=======================   snip

>>  John Couture