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

["Jim Mora" <jmora@xxxxxxxxxxx>]

Hello,

Firstly, Java TC says you are pretty close to transformer resonance (.013)
which as you know could really cause a voltage rise. Secondly, I think it
would behoove you to have a higher voltage head-end on the cap bank. Terry
used to recommend a 1.5x LTR for a static gap which would be .0195~.02 to
avoid the aforementioned resonant rise. This may also help protect your
transformers as well.

Old school was that cap ratings should be 1.5 - 2x Vpeak. Two banks of 15
would be great head-end room, lots of current capability, bigger bang, and
yea more bucks, though they could be added to if you add more transformers.

Group, please jump in on this if this is too much overkill.

Jim Mora

  

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Vinnie
Sent: Saturday, December 01, 2007 10:54 PM
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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