[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: need help/capacitors and AC



Original poster: Mddeming@xxxxxxx In a message dated 5/4/07 1:07:13 A.M. Eastern Daylight Time, tesla@xxxxxxxxxx writes:
Original poster: "Matthew Boddicker" <shmerpleton_town@xxxxxxxxxxx>

This is Matthew,
On the cornell-dubilier web page it said that the model 942C caps
went to 2000dc or 500ac. Do I pay attention to the dc or ac rating?
thanks Scott,
Matthew

With the 942C caps, you can use the DC rating and the Peak transformer voltage for calculations.

15 kV transformer = 21,213 Peak V  ===> 11 caps minimum, per string
12 kV transformer = 16,971 Peak V  ====> 9 Caps minimum, per string
9 kV  transformer = 12,728 Peak V =====> 7 caps minimum, per string

Most folks who do not like to replace caps due to transients, use up to a 50% safety margin, making these numbers 18, 15,and 12 respectively. Adding strings in parallel increases both the capacitance and the current rating, so it is sometimes necessary to make strings longer to get the right capacitance.


Hope this helps,

Matt D.




----------
See what's free at <http://www.aol.com?ncid=AOLAOF00020000000503>AOL.com.