Re: need help/capacitors and AC

["Tesla list" <tesla@xxxxxxxxxx>]

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.




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