Jim is correct; more information about that can be found here:
https://en.wikipedia.org/wiki/Root_mean_square
It's kind of like the average value of a function, but squared like
variance, such that you don't end up with a situation where your "rms
average" is meaningless. (ie standard function for "average value" of a 50%
square wave would be zero!).
Regards,
-Adam
My DRSSTC has 5 such capacitors in series, and 28 such series strings in
parallel. This works out to be 0.8uF at 10kV or so.
On Tue, Mar 18, 2014 at 11:31 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> On 3/18/14 3:36 PM, Tyler Burns wrote:
>
>> So I'm looking at Cornell Dubilier's 942C series and I need some more
>> guidance. Does the VDC rating matter since these use AC? Regardless,
>> what range voltage rating should I be looking at? Or at least what is
>> it related to so I can do my own calculations.As far as capacitance
>> per individual cap, I assume that depends on how many caps I want to
>> buy, as the number of strings and number in series can create
>> infinite combinations to reach a specific capacitance. Oh and it will
>> also depend on my voltage as well, so it can handle the voltage.
>> Please correct any of this if it's wrong and answer any of these many
>> questions if you can. Thanks guys,Tyler
>>
>>
>
> There's some MMC calculators out there (geekgroup, maybe)..
>
> DC rating is important in the sense that you use that to figure out your
> rating based on the peak voltage of your source. For instance, a 15kV
> (RMS) NST has a peak voltage around 21 kV (15*1.414).. I'd be comfortable
> with running 11 2kV caps in series (22kV).. i'd even be comfortable running
> 10 in series. Maybe even 9, living a bit dangerously.
>
> There's lots of posts in the archives from more than 5 years ago about how
> far you can push these babies. (you might look for "EMMC")
>
> A more important thing for longevity is the RMS current. Overheating will
> kill the capacitor.
>
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--
Adam Munich
Student Director, RIT Makerspace. http://hack.rit.edu
Tel: +1 716 796 4439, http://www.adammunich.com
This message is composed of 100% recycled energy states.
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