RE: [TCML] MMC failure / question or advice.

[<toxandale@xxxxxxxxxxxxx>]

I made an MMC out of the GE 42L4102 (3000 VDC / 750 VAC) .100 uF caps and
never had a failure. My strings were 12 long, and I used 4 strings for
roughly .033 uF (36 KVDC with usually no more than 12 KVAC applied is much
easier on the caps). It's a snubber just the same, but maybe more robust? If
you have spares, have you considered longer and multiple strings. 16 KVDC
with 12 KVAC applied is really pushing it.

Terry



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Vinnie
Sent: Sunday, December 02, 2007 12:54 AM
To: Tesla@xxxxxxxxxx
Subject: [TCML] MMC failure / question or advice.

Hello people

 Recently I have been running into some trouble with my coil and what I
believe to be an MMC failure
but not sure whats causing it.
 I am running 8 series CDE 942C20P15-F .15MFD 2000VDC caps in my MMC. First
failure burned a hole
through two of these caps. I replaced the two bad caps with the same type
and did two more 20 second
runs which resulted in a loud snap. No visible damage this time but I could
still hear a loud snap or arc 
even after the coil stopped functioning. One bleeder resistor on one of my
caps looks to have heated quite
a bit but it doesn't look burnt. Primary power input is 2 12/30 NST's and a
RQ style gap. This functioned
great for years but it seems somewhere something is breaking down now. 
Does anyone have an ideas what could be happening. I am thinking maybe it's
time to build complete new MMC.
Would anyone know if there is a better more robust MMC solution for my
setup?

Thanks

Vinnie
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