Hi Thomas, Ok, so a 6/30 NST.DC's recommendation of 1.4 x Cres I agree with (it's what I use). With your transformer Cres value, you do want .01875uF for the tank capacitance.
Two practical ways to get there with your caps. a) 1 string of 8 caps. b) 2 strings of 16 caps.Because your NST is low voltage with a Vp of 8,485 volts, you could go with 1 string of 8 and your cap will be rated at nearly 2 x Vp which is decent and poses no problem in your particular case. The temp rise however is up to 0.712 per deg C which is starting to get high, but doable.
The 2 string of 16 is extremely over rated for the transformer (nearly 4 x Vp), but that's ok. Temp rise is down to .178 per deg C (so basically running "ice cold").
DC is correct about the selection for a robust MMC. I think the 1 x 8 is doable in your particular case, but I think if I were you, I would also probably go with 2 x 16 array to keep the power dissipation down (but only for that particular reason).
Take care, Bart Thomas Ryckmans wrote:
30 mA only :-( -----Original Message----- From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of bartb Sent: 05 October 2008 19:34 To: Tesla Coil Mailing List Subject: Re: [TCML] MMC building - some questions Hi Thomas,For a 6kV NST, 16 caps may be overboard. DC did not know your transformer voltage and this would certainly change the MMC design. What is your 6kV NST current?Bart Thomas Ryckmans wrote:Sorry, I should have mentioned to all that I am using a 6000V nst.Anyway, I'll do 2 strings of 16 caps as per DC's instructions Thanks to all - 19 days to the Cambridge UK Teslathon now! - Thomas_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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