Re: AC rateing of DC caps

From: 	DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Thursday, July 24, 1997 10:51 PM
To: 	Tesla List
Subject: 	Re: AC rateing of DC caps

To: Cap inquiry on Tesla List

A "safe" value is to use the peak-to-peak rating or 2.8 x Erms.  This will
work in most all applications and seems to work well in Tesla systems that
see high voltage reversal rates.  The caps must be at least "pulse rated
duty" --- ordinary DC "filter" caps usually fail because they will take the
high peak to peak voltage reversals even with a 20% safety margin.

Hope this helps out.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Re: AC rateing of DC caps
> Date: Thursday,July 24,1997 11:52 AM
> From: 	Alan Sharp[SMTP:100624.504-at-CompuServe.COM]
> Sent: 	Thursday, July 24, 1997 4:58 AM
> To: 	INTERNET:tesla-at-pupman-dot-com
> Subject: 	Re: 2 foot sparks - need more garage!
> >How do you figure an equivalent AC voltage for a cap rated in DC.  I
> don't want to bust mine.<
> Kevin,
> The wisdom on this list is to divide the DC voltage by 4,
> 28kV DC goes to 7kV AC for Tesla use - I've pushed this
> to a little over 8kV, after observing that none of my
> caps were getting warm.
> Alan Sharp UK