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Re: MMC Survivability
Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
Cp = 100nf (10 strings of 15 per string).
Vpeak = 20400 so Ipeak will be 20400/sqrt(Lp/Cp) need Lp to solve
but if I assume 50uh (my primary is 70uh), Ipeak = 912 amps Your MMC
will be good for 4320 amps.... OK
Assume Irms is 912/1.414 = 645amp rms during energy transfer. Assume
energy transfer is 50us (1st notch quenching) out of a BPS period of
5ms. So Irms = sqrt (645^2*50us/5ms) = 645 * sqrt (50us/5ms) = 64.5
amps_rms. Your MMC is good for 135 amps rms.... OK
Note, if 2nd notch quenching Irms = 645 * sqrt (150us/5ms) = 111 amps
so still OK
You are operating at 20400Vpeak and the MMC is rated for 30000Vpeak.... OK
I think everything is fine if you provide sufficient cooling. Actual
RMS during ring down will be less cause it does ring down. Second
notch current wont be as high as first notch current. Many of the
presentations will be at less than peak voltage and some of them
won't even fire. So the rms current prediction is really awfull
worst case. Just monitor the temp rise until your comfortable with
Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
I'm building a 12" coil powered by a 5KVA 14.4kv
(pushed a bit). I had hoped to buy one of Dr R's
Maxwell super caps but the buy won't go through until next spring.
What do you think the survivability of 10 rows
(.1uf) of CD942C .15uf, 2000kv x 15 strings and a
200 BPS ASRG will be, since I have that many?
Thanks, I suspect it would be on the edge.