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MMC



Original poster: "Samuel Rosset by way of Terry Fritz <twftesla-at-uswest-dot-net>" <samr-at-bluewin.ch>

Hello all,
 
Before I buy the caps for my new MMC, I'd like to ask you some question, for I
don't want to make the same mistakes (I'll stay away from WIMA MKP 10, for
their rated dv/dt was only 250 v/us, when I was asking for 800 v/us from every
caps!) Someone on the list recommanded me to use WIMA FKP 1. Does anyone use
them?
 
How can I choose a cap value. I am using a PT, and therefore not caring much
about resonant charging? I have a 220V wallplug -at- 10 amps and a 16 kV PT. From
the 2200VA I can draw from the house plug, 500W are lost in the resistive
ballast. I was thinking to use the conservation of energy :
(2200-500)=0.5*BPS*C*(16000)^2 but I am not please with that for the following
reason :
I am assuming a cos(phi)=1, which is not accurate, 
I am using a static gap, so how can I be sure the of its firing voltage (that I
assumed to be equal to 16KV), and same thing with the BPS, with a static gap,
it is hard to know!
I read somewhere that with a static gap, one should use 
LTR C <= 1.5* C resonant : Why? Where does this formula come from?
 
Thank in advance
 
Samuel