RE: panasonic mmc rating?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mark W. Stolz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mark_w_stolz-at-hotmail-dot-com>

Larry,

Please do NOT follow this advice and run with the DC rating of the caps.  
Unless of course you have more money than you know what to do with, this is 
a good way to burn up caps.

You are correct in using 6500 x 1.414 to find the RMS.  Rate your caps 
conservatively and you'll avoid problems.  I personally have my MMC rated at 
30kV being driven by a 15/60 NST.

Mark Stolz
Houston, TX

>Original poster: "Mccauley, Daniel H by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>
>
>Actually, some people (including myself) have had luck running MMC type
>capacitors using their DC rated voltage as their AC rated voltage.
>
>Dan
>
>
>
>
>I'm building an mmc using panasonic caps from the same group as
>the ones spec'd in the terry filter.  the digikey p/n is p10513-nd.
>I'm building an mmc to replace the single pulse cap that I killed
>in my friends tabletop coil.  its using a 6500v/20ma open frame nst
>and the resonant cap is about 8nf.  the rms output is ....  okay
>my stupid math skills are haunting me...  is the rms output 6500 x 1.41
>or 6500 x 2 x 1.41 ?  the cap i designed is 2 strings of 9 0.033uf 1600v
>caps. giving a rating of 14.4kv at 7.5nf ( i think, the plans are in the
>other room. )
>
>the question:
>to calc rms output: 6500v x 1.41 = rms output?
>I'd like to overrate the mmc so I would get 6500 x 2 for the target rating.
>
>also planning on making the mmc into a cube of sorts due to size
>constraints.  if cooling becomes an issue, I will place a small fan on one
>end of the cube.  the mmc cube will be like this: imagine two strings of
>caps folded length-wise 2 times.  2 wide by 3 high. about a 3" cube.
>
>larry