Re: MMC advice

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

Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org> 

1200A across 5 strings of caps is only 240A per string - just over half 
their rating of 432A peak.  Even if using an "unrecommended" design of 9x3 
.150uF caps for .050uF 20kV, the current rating is still within 
manufacturer's specified limits....

FWIW, I have yet to come across a functional TC design that exceeds either 
the peak or RMS current rating of the caps without also exceeding the 
voltage rating by a good amount.  The only feasible designs I've been able 
to come up with (using an Excel MMC sheet based off Terry's MMC_Calc2 BASIC 
app) that would cause problems use extremely high break rates (well over 
500BPS), which cause excessive cap heating.  I could see big coils run with 
very low surge impedances causing peak current problems, but only if the 
secondary has, say, 400 turns and micro-small toroid.

That brings up a question with all the magnifier discussions going on: how 
do the peak and RMS currents look in the primary circuit of a magnifier - 
both optimally built using Antonio's research or just thrown together a la 
Dave's Labor Day Coil?

Regards,

Mark Broker
Chief Engineer, The Geek Group


On Wed, 01 Oct 2003 11:43:26 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:

>Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> With a pig running 
>a .06 MFD cap you will probably be exceeding the peak
>current ratings on the cap.  I measured a peak pri current of 1,200 Amperes
>on one of our coils running with a .05 MFD cap and 18 inch dia. coil.
>
>They will work --- for a while.
>
>Dr. Resonance
>
>Resonance Research Corporation
>E11870 Shadylane Rd.
>Baraboo   WI   53913
>
>  > Suppose I went with the geek caps.
>  > With a pig at 14.4Kv how much money do I need to spend on caps for a value
>  > of .06uF ?
>  >
>  > Rick W.
>  >
>  >
>  >