Cap question(s)

• To: tesla-at-pupman-dot-com
• Subject: Cap question(s)
• From: Gavin Hubbard <ghub005-at-xtra.co.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 14 Jul 1999 11:56:52 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hello list.

I am building an 8" coil with a 11kV, 5kVA pole transformer. I have
finished most of the work but haven't sorted out the primary capacitor for
this system.

I have 20 new 0.1uF, 5kV glassmike caps which I planned to use for this
project, but I have been offered (for money) a good pair of used 0.06uF,
40kVDC Maxwell pulse caps. What, if any, difference in performance should I
expect between similarly configured caps in an otherwise identical system? 

Of course the glassmikes will be slightly lossy and probably get warm
during a run, and the Maxwells would have a lower ESL and ESR, but will
this alter the real world performance of the coil?

Cheers

Gavin Hubbard


P.S. When designing a reso cap system, many people simply calculate the
impedance of the NST from output V and I, then assume its reactive and
build a matched cap. I've always wondered what the actual impedance of the
NST is...surely with hundreds of metres of wire in the secondary it must
have a large resistive component? 

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