RE: Why does running an NST on an async gap kill it?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi,

The "latest" Terry filter specs at:

http://hot-streamer-dot-com/TeslaCoils/Misc/NSTFilt.jpg

now varies the number of MOVs for various NST voltages.  The number of MOVs 
has also been improved to provide a little more tolerance and room for 
people with 140VAC variacs.

Cheers,

         Terry




At 08:19 PM 8/8/2003 -0400, you wrote:
>I believe there are MANY safety gaps out there that are set not to the 
>maximum NST voltage, but to whatever is necessary to keep them from 
>firing.  And, Terry's filter spec's MOV's for a 15kV NST.  If one uses a 
>lower voltage NST and builds things verbatim without considering if the 
>design needs to be modified, then a higher than rated voltage can be 
>expected.
>
>Gary Lau
>MA, USA
>
> >Original poster: "Zagarus Rashkae by way of Terry Fritz 
> <teslalist-at-qwest-dot-net>" ><arbitrarily_random-at-yahoo-dot-com>
> >
> >Hi Gary, All,
> >
> >I called it an "R-L-C" filter since the wirewound
> >power resistors do have significant inductance, and
> >they do help suppress spikes.
> >
> >I don't see how resonant rise can possibly destroy the
> >NST if there are MOVs and a saftey gap.
> >
> >Regards,
> >
> >Chris Lu