Re: [TCML] Capacitor Choice Reassurance

[mddeming@xxxxxxx]

Hi Philip,

As long as you use a safety gap and don't overstretch the main gap 
spacing, this should be fine. Some folks like a larger safety margin, 
but unless you're running hours a day, this should be adequate. 
Remember, to keep the capacitance the same, adding more caps per string 
means adding more strings and the cost quickly gets out of hand.

Good Luck,

Matt D.



-----Original Message-----
From: P Tuck <follies@xxxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Fri, 29 Aug 2008 5:02 am
Subject: [TCML] Capacitor Choice Reassurance



Hello.

I have been lurking a while prior to building as I'm in the process of
getting all the necessary parts. I just wanted some reassurance on my 
recent
capacitor order.

My NST is a 10K/48 mA, and I will be aiming for a LTR value of 21.4 nF 
(the
res value would have been 15.2 nF on a 240 volt 50cycle UK supply) Gap
will be a static.



I have ordered 28 X CD 942C20P-15K-F's for two strings of 14 in series
giving 21.4nF rated for 28Kv. This is twice the peak voltage of the NST.
Should I have aimed higher - say 2.5 times peak?

(bearing in mind these are meant to 'tough' caps)



Now for the uncertainty. The caps' are rated at a peak current of 
around 430
amps (I have seen differing estimates) My understanding of this is that 
it
means two string in parallel should be safe so long as the primary 
circuit
current does not exceed 860 amps ? JAVATC gives around the 500 amp 
figure
for the primary circuit.



Or is there something I'm missing?



Thanks



Philip





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