Re: LTR question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Michael Rhodes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rhodes-at-fnrf.science.cmu.ac.th>


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, October 27, 2001 9:58 PM
Subject: LTR question


> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>
>
Actually LTR refers to Larger Then Resonant.  The primary system
has two resonant frequencies, the first being the L of the NST and
the primary cap.  The resonant frequency of this circuit is based on
the 50/60Hz power cycle.  If the capacitor is selected to be resonant
with the 50/60Hz and the NST inductance it will obtain full charge
voltage at the peak of each cycle.

When the spark gap (switch) fires this closes the 2nd resonant circuit
consisting of the capacitor and the Primary coil (L).  This resonant
frequency is the one to determine primary/secondary resonance and
is in the hundreds of kHz.

If the spark gap mis-fires then the NST inductance and capacitor will
resonate at the 50/60Hz rate causing what is termed resonant rise and
can increase the peak voltage across the capacitor and NST 2-3 times
creating stresses that can damage either the NST or cap or both.

Use of a larger then resonant (50/60Hz) capacitor prevents (or reduces)
this effect.

--Michael

> I have been reading a lot of posts lately about LTR (lower than resonant)
> capacitors. This term does not make sense to me. Any capacitor in
combination
> with an inductor will form a tank circuit which will resonate at a
frequency
> determined by the values of the L and C. Is LTR refering to some sort of
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