Re: Cap question(s)

to: Gavin

With the power levels of a pole xmfr the glass mike caps won't last very
long.  They will overheat and breakdown in short order.  The frequency is
much too high for this cap which is essentially a DC only filter cap.  Get
the Maxwell pulse caps if you're going to run with a pole pig.

Many years ago I used a pair of the "blue beasts" and they all died within
one week with a NST as power source.



-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Wednesday, July 14, 1999 9:59 PM
Subject: Cap question(s)

>Original Poster: Gavin Hubbard <ghub005-at-xtra.co.nz>
>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?
>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?