Re: Safety gaps destroyed my Neon ?
Tesla List wrote:
> Original Poster: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net>
> Hi Robert,
> > I have been arguing against using a grounded center tapped NST safety
> > gap for years because I feel this is asking for trouble as you pointed
> > out. You just cannot guarantee that both gaps will light
> >simultaneously to stop the voltage surge with such a gap system.
> >One half going into the conductive state might well reduce the overall
> >surge sufficiently to prevent the second from lighting at all. At the
> >same time, a healthy surge then becomes directed to where it can do
> >damage. Just my opinion.
> Iīm not sure I can agree with you here. If you use a 2 piece SSG (esp
> on center tapped xformers) you can still raise one side of the xformer
> to dangerous voltage levels (and the 2 piece gap wonīt fire) AND this
> SSG is nothing more than a second main gap. The voltage is not bled
> off to a ground (zero volts) potential. In other words, the current will
> be forced through the tank circuit once again. If there is *any* high
> frequency superimposed on top of this voltage AND you are using
> any kind of filter, you will have to force all this through the filter
> in the *wrong* direction. This may or may not work (the time
> necessary, will become a problem). In any case, you will have RF
> floating (at some undefined potential) around the xformer, which
> is not instantly bled off. Personally I think a 3 piece SSG alone
> is good enough. I donīt use any other filters, etc. I have not lost
> a NST yet (and my SSG has fired lots of times). The 3 piece
> SSG will bleed of any overly excited electrons (read: overvolting)
> to a pretty firm zero potential. If only one half of the gap fires,
> then obviously, the circuit has a raised potential only on one side.
> The gap will clamp the voltage down to a safe potential. If the
> surge is not clamped hard enough, the second gap should cut
> in and save the other side of the transformer.
> Coiler greets from germany,
Well then, I guess we each have a different opinion on this matter. Your
argument is compelling, but I am not swayed in my own opinion. I will
continue to successfully employ a single, non-center tap referenced
safety gap on my NST type systems.
Robert W. Stephens