Re: NST/capacitor resonance question

• To: tesla-at-pupman-dot-com
• Subject: Re: NST/capacitor resonance question
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Tue, 06 Apr 1999 23:32:17 -0600
• Approved: twf-at-verinet-dot-com

Tesla List wrote:
> 
> Original Poster: Adam <psycho-at-tradewind-dot-net>
> 
> I'm still new at this, so someone please correct me if my logic is
> wrong.
> 
> I determine the optimum capacitance of the tank capacitor by matching
> capacitive reactance (impedence), with the NSTs reactance (impedence),
> which is assumed to be inductive.  The reactance equations are done with
> frequency=60Hz (line frequency), so when this part of the circuit is
> active, the only impedence is resistive, and much more power gets
> through.
> 
> This seems great, but what about the normal resistive qualities of the
> NST?  The NST is made up of a LOT of thin wire, right?  I would think
> this yields a rather high resistive impedence.  Wouldn't this be
> inconsistent with the assumption that all the NST's impedence is due 
> induction?  Or is the resistance so small that it has very little effect
> on the NST's total impedence?  

        For a 12000 volt, 60 ma 60 Hz transformer such as I use here the
nominal leakage impedance is 200000 ohms (12000/0.06), while the total
DC resistance is of the order of 5000 ohms.  Bottom line is that it DOES
have a small effect on the total impedance.

>I believe the latter to be true for the
> self-capacitance of the transformer, but I've never really looked at an
> NST core, so I have a very barebones understanding of what's in there.
> 
> Nothing is ever simple, and that's why I love this
> Adam

Ed

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