Re: Theoretically, Cltr/Cres = pi/2

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Ralph,

Even though the secondary coil may be 3512 Henry, the current shunts reduce
the coupling and the "effectiveness" of that value.  In the conclusion of
Tero's paper:

http://tesla.tr-labs-dot-com/design/resocap/

Cres = 1 / (4 x pi^2 f^2 x (1-k^2) x L^2)

This compares to the older formula:

Cres = Inst / (Vnst x 2 x pi x Fline)

So where we match the impedance (Vnst/Inst), Tero has gone ahead and found
the relation to L and k and added it in.  I think the key here is that the
'lower primary to secondary coupling lowers the effective inductance of the
secondary' and you need a larger cap (~5X) to match it rather than 2nF.

Cheers,

	Terry



At 09:23 PM 4/1/2002 -0500, you wrote:
>Terry and all,
>
>That's a giant leap because I am just now matching wits with my first SRSG and
>John's phase controller. I have been unable to relate the bps power for the 
>static gap
>and the SRSG as it is left obscure (fuzzy) in the chart.  
>
>It's unlikely that others will be confused over the following point but the 
>concept of
>the LTR cap has confused me for some time, so I offer the following as 
>another entry in the stupid Q contest:
>
>>From the schematic for the NST charging system from which the chart is 
>derived,
>
>(http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/NSTStudy.htm)
>
>Ls for a 15/60 NST is a gigantic 3512 Henries. Using that value and the line 
>freq
>of 60 Hz, the cap that will resonate at 60 Hz is 2 nF (2 EE - 9 F). 
>Very stupid Q:
>Is there any way of relating this value to the chart? Can you derive
>Cltr = Cres x 1.57 from the 2 nF value.  I can't.  :-))
>
>Maybe there is a derivation that will finally bring to the list a real 
>acronym.
>
>Happy Day,
>Ralph Zekelman
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