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Re: [TCML] Proper NST Protection
What I meant, but did not make clear, was that NSTs with a full Terry
filter last longer than those with JUST a safety gap. In my experience, a $0.25
safety gap will give five to ten times the life expectancy, adding the
other $60.00 in parts will double or triple it again, but that the most
improvement per $ spent comes from a safety gap. Sorry for not being explicitly
clear after midnight.
In a message dated 10/20/2009 12:16:02 A.M. Eastern Daylight Time,
You wrote (regarding NST failures in Tesla coil systems):
"Those with Terry filters last longer than those without. Both are
significant, but he single best improvement is the safety gap."
Since Terry's original R-C filter design utilized dual safety gaps from
HV supply line to ground, located between the coil's tank circuit and the
R-C portion of the filter, I don't understand how this statement could be
true. Intuitively, a protection circuit with safety gaps, resistive
and bypass caps to ground should more effective than just bare safety gaps
in isolating the NST secondary from high frequency tank-circuit transients.
Do you have any data that would demonstrate that a simple safety gap
provides better NST protection than a Terry filter?
Just curious, since I haven't seen any quantitive data on NST transients
protection circuits since Terry's original testing was published way back
----- Original Message -----
Sent: Monday, October 19, 2009 6:52 PM
Subject: Re: [TCML] Proper NST Protection
> NST's with safety gaps, on average, last significantly longer than those
> without. Those with Terry filters last longer than those without. Both
> significant, but he single best improvement is the safety gap.
> Matt D.
> In a message dated 10/19/2009 5:56:05 P.M. Eastern Daylight Time,
> mrbrandman@xxxxxxx writes:
> I've been running a half-dead NST on my coil it's entirenlife without
> knowing it, and now's the time to deal with it... The pain of buying a
> new one without the experience of blowing it up! Pitiful... Anyways,
> to keep this new one on it's way in mint condition, I need some form
> of protection. This calls for a safety gap and/or a Terry filter. I'm
> nowhere close to being able to afford the parts for one of those. So,
> will a safety gap across the HV terminals be adequate enough
> protection for the new NST? Or do I need to fork out another $60 (i
> dont have) on this thing?
> Tesla mailing list
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