Re: [TCML] Proper NST Protection

[Mddeming@xxxxxxx]

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. 
 
Matt D.
 
In a message dated 10/20/2009 12:16:02 A.M. Eastern Daylight Time,  
quarkster@xxxxxxx writes:

Matt  -

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 
each 
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 
snubbers 
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 
and 
protection circuits since Terry's original testing was  published way back 
in 
early 1998.

Regards,
Herr  Zapp

----- Original Message ----- 
From:  <Mddeming@xxxxxxx>
To: <tesla@xxxxxxxxxx>
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 
are
> 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?
>  _______________________________________________
>
>
>
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