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[TCML] MMC Primary Caps for Sale or to recommend
I am looking for recommendations for Primary Caps to use for an MMC
style capacitor bank.
Does anybody recommend specific brands or does anyone have anything they
would like to sell me.
I was recommended recently by Bart that I should use 1.3 to 1.5 times
the NST resonant value.
so I will need 6.366nF x 1.3 = 8.3nF to 9.5nF for each 15kv/30mA
transformer I have.
and I have 5 (or 6 or 7 if I use the 3 phase circuit at home).
Basically I need capacitance in multiples of 9nF @ 15kV RMS up to a
total of 54nF so I can disconnect transformers for different power levels.
All my transformers are rated the same 15kV @ 30mA
Terry fritz posted this on:
14 May 2000
He tested these caps:
"0.047uF 1500V Arcotronics capacitors "RS" from Richie Burnett
2.5 amps RMS 350kHz 2.2 degrees C
0.022uF 1200V Panasonic Q-E?? from Bill Noble
2.0 amps RMS 350kHz 4.8 degrees C
0.056uF 1600V Phillips 376 KP/MMKP HQ from Finn Hammer
3.5 amps RMS 350kHz 1.5 degrees C
I also retested my Panasonic with my more refined setup of today
0.056uF 1600V Panasonic ECW-H16563JV
3.5amps RMS 350kHz 3.1 degrees C"
and found the following points:
"I would say the important MMC cap
parameters are as follows:
1. Polypropylene is the ONLY acceptable dielectric
2. "Self healing"
3. 1500-2000 VDC rating The ~630VAC rating is immaterial
4. High-energy, pulse-discharge, high-dI/dT, high-dV/dT, or good
continuous end/lead attach is a must.
5. 0.05 to 0.10uF seems to be the best range of values-all things
6. WIMA, Phillips 376, and other relatively large potted styles seem to
run a bit cooler."
The post above was quite old, but are these recommendations still valid
for capacitors to use as MMC primary Caps?
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