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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