Re: [TCML] My last question on caps. I swear. (maybe)

["DC Cox" <resonance@xxxxxxxxxxxx>]

Use xmfr Erms rating x 2.5 and you will not have problems.  At 24 kV AC x
2.5  =  60 kV DC rating

With your 9 kV nst, then, 9,000 x 2.5  =  22,500/2 kV per cap  =  11.25 MMC
caps   so, use 12 in series in each string.  24 kV DC rating.

In our larger caps, for pole xmfrs, I use .06 uF and 0.1 uF (60 and 100 nF
respectively) conservatively rated at 80 kV DC.  Peak currents with the .06
uF cap are hitting 2,850 Amperes and with the 0.1 (100 nF) cap it's hitting
4,600 Amps peak.

Dr. Resonance




On Tue, Jul 8, 2008 at 2:03 PM, Nicholas J. Goble <ngoble@xxxxxxx> wrote:

> With a 9/30 NST  I found my LTR capacitance to be .0124uF. (right?).  I
> placed an order for 13 (1 more just in case I need an extra)
> 942C20P15K-F caps.  They're rated at 2000VDC and .15uF.  If I string
> them together in series, I'll get an MMC at 24000 Volts and .0125uF.
> Two things worry me.
>
> 1).  The website says that it's rated for 2000VDC.  I'm not using
> direct current.  There's a link to a data sheet for the caps and it
> says that the voltage range is 600-2000 VDC or 300-500 VAC.  If I
> series 12 of these together, will I get an MMC rated at 24000 VDC and
> only 6000VAC?  Does this mean that I've got to string 48 caps to get an
> MMC that will work at 24000VAC?  Or will 12 2000VDC caps work just fine?
>
> 2).  The website shows a picture of the caps.  On the side of the caps,
> it says it's rated .15MFD.  Why would it say that?  I thought
> 942C20P15K-F caps were rated at .15uF.  This isn't a huge concern of
> mine, but it's making me worry about my purchase.
>
> Thanks for putting up with me.
>
> Nicholas Goble
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