[TCML] Another MMC question.

Tue Dec 11 20:08:57 MST 2007

Hi Michael,

It's not my chart to update (I think Terry F or Mike Everett?), but I 
did find it for those seeking it at the time and put it up as a document 
link at my site. I think I'll just take it down since I personally don't 
agree with it.

It's funny, I argued the case of voltage on MMC's for a long time, but 
it seemed that 90% of the TCML argued against it. Now I'm hearing just 
the opposite. I feel vindicated in some respect, but also stupid for 
throwing the TCML's old MMC chart up for reference.

I think maybe I'll just make my own chart and throw that up for those 
who need a chart to go by.

Take care,
Bart

Michael Robinson wrote:
> I have to agree to go with the two strings of 15 of 16 caps.  I
> followed that same chart on my first mmc and within a month and a half
> had an explosive  failure.
>
> I also might suggest that Bart update that chart to be a little more
> conservative as apparently more than one of us have taken its advice.
>
> Michael Robinson
>   
>
>   
>> Hi Vinnie,
>>
>>     A 12/60 NST has a peak voltage of ~17 kV. A  single string of 8 caps is
>> ~19 nF but only rated 16 kV. Even with a  conservative spark gap setting, this
>> is pushing right to the edge! It should be  considered the absolute minimally
>> functional value and it will probably  experience early death. Your two
>> strings of 15 give you 20.0 nF, rated at  32 kV = much safer, better power handling
>> (longer life) = happier  coiler. Because of the way caps add, to double the
>> voltage safety margin, you  need ~4 times as many caps. To double the peak
>> current capability, you also need  ~4 times as many caps. (to keep the same total
>> capacitance)
>>
>> Matt D.
>>
>>
>>
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