Thank you all for your input.
I have built 4 of the TF's from the design found here>
http://www.hvtesla.com/terry.html< two for myself and two for friends. My
reasoning for the question was that I am building some rather smallish
coils and wondered if there was something between the TF and a plain
safety gap. I may try two safety gaps in line on a coil.
Worst case is that I could acquire a 6KV door stop😎
PS, I wish one of you brainiacs would find a way to use the smaller GF
NST's without tearing into it to remove the GF circuit.😀
AJ
On Tue, Mar 16, 2021 at 11:11 PM Tedd Dillard <tedd.dillard@xxxxxxxxx>
wrote:
> Gary this all very interesting and also the result of much work on your
> part.
> What can you say about protection for pole transformers?
> Teddy
>
> On Tue, Mar 16, 2021, 8:25 PM Gary Lau <glau1024@xxxxxxxxx> wrote:
>
> > A Terry filter contains three independent circuits and you can choose to
> > use any or all. I have a web page detailing the how's and why's of
> > protection circuits - http://www.laushaus.com/tesla/protection.htm
> >
> > 1) A 3-terminal safety gap. This is the cheapest of the 3 parts and by
> > far, is the most important. But to be useful, the gap width must be set
> to
> > just wider than the NST open-circuit voltage sparking voltage. If you
> set
> > it to where it stops firing when you're running your coil, you've
> > accomplished nothing.
> >
> > 2) An R-C low-pass filter. This filters out VHF transients resulting
> from
> > some seldom-discussed spark gap behaviors. Read my web page above for
> > details. Since the components for an R-C filter are pretty cheap, no
> > reason not to use it.
> >
> > 3) MOV voltage limiters. The MOV's must be carefully chosen to have a
> > clamping voltage well in excess of the peak cap-charging voltage, but not
> > so high as to never conduct, even in the face of an over-voltage
> > (uncontrolled resonant rise) event. If you're going to skimp, this is
> > probably the place to do it.
> >
> > Further questions and discussion - very welcome!
> >
> > Regards, Gary Lau
> > MA, USA
> >
> > On Tue, Mar 16, 2021 at 7:18 PM Adam James <adamjamesarmy60@xxxxxxxxx>
> > wrote:
> >
> > > Hello all,
> > > Is there anything better than a simple safety gap, but less than a
> > > terryfilter for SG coils?
> > > AJ
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