# Re: [TCML] MMC design

Good engineering design calls for Erms x 2.5, so at 9 kV Erms x 2.5, would
equal 22.5 kV.  Dividing 22.5 kV / 2 kV MMC value = 11.25, so best to use
12 MMCs per string, then parallel as necessary.

Dr. Resonance

> I'm going through some of the MMC calculators on the net trying to figure
> this stuff out.
> I have a 9kv NST and LTR capacitance is 12.5nF
> output of the NST is ~13kv p-p   (close enough)
> so, assuming 0.1 2kv caps
> 1 string of 8 = 16kv and 13nf
> 2 strings of 16 = 32kv and 13nf
>
> is 16kv "high enough" above the NST?
> is it just a waste to go with 2 strings of 16, should I, in this scenario,
> stick with 1 string of 8 and call it good?
> if the caps were 0.047 and 2kv, then 2 strings of 8 = 16kv and 11.75nf
> or 3 strings of 11 at 22kv and 12.82nF
>
> which is more important in designing the MMC?
> is it more important to be as close as possible to the LTR value or have
> enough voltage "padding" above the xmfr? is there some other factor in
> here
> to use (like the discharge energy or something?)
> thanks
>
> Paul (I didn't expect the Spanish Inquisition) in Michigan...
>
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Dr. Resonance

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