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Re: RSG and NST's
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- Subject: Re: RSG and NST's
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Sat, 27 Nov 2004 12:16:45 -0700
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- Resent-date: Sat, 27 Nov 2004 12:29:45 -0700 (MST)
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Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
We run them around 380 bks/sec without problems. I do agree, the lower
break rates might cause problems especially if the xmfr is not protected
with a safety gap.
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
> I don't agree that the hazard associated with async RSG's and NST's is
> due to excessively high break rates. With an NST, as an RSG's break
> rate increases, the bang voltage will go down, making it LESS stressful
> to everything. The same effect may be achieved by reducing the spacing
> of a static gap - lower bang voltage and higher bang rate - and I think
> all agree that narrow static gaps are the least stressful. Even if bang
> voltages did not diminish with increasing BPS, I still don't see how the
> NST would be any more stressed at higher BPS.
> On the other hand, it's easy to demonstrate via simulation the
> consequence of having a too-slow BPS, resulting in mains resonant-rise.
> I'll be the first to admit that my opinions are based solely upon theory
> and simulations, and I have not personally attempted an async RSG and
> seen an NST fail. If you have experience demonstrating that high BPS is
> in fact more stressful, I would enjoy hearing it, as well as your theory
> as to the actual stress mechanism that increases with BPS.
> Regards, Gary Lau
> MA, USA
> > -----Original Message-----
> > From: Tesla list [mailto:tesla@xxxxxxxxxx]
> > Sent: Friday, November 26, 2004 8:07 PM
> > To: tesla@xxxxxxxxxx
> > Subject: Re: RSG and NST's
> > Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
> > Technically, a NST is designed to provide an ignition voltage for a
> > tube, ie, 9-15 kV to quickly ignite the gas in the tube, and then the
> > voltage drops back considerably, usually down to 400-600 VAC to
> sustain the
> > plasma. At this point it becomes a current source to keep the plasma
> > bright.
> > In short, a NST is not designed to provide a continuous source of HV.
> > do, and they work well with TCs firing 120 bks/sec. They will also
> work at
> > higher break rates but one must be very very careful to provide
> > filtering to prevent ANY high freq transients from getting back into
> > windings. A "Terry Filter", named in honor of its inventor, Terry
> Fritz, is
> > commonly employed to provide this high level of filtering. Perhaps
> > could post this location in his extensive archives collection.
> > http://hot-streamer.com/TeslaCoils/Misc/NSTFilt.jpg
> > The other area, that must be carefully monitored, is the total spark
> > setting when running a NST. Usually 0.220 to 0.250 is the absolute
> > total spark gap setting that should be used with a NST. Larger gaps
> > problems and failures on the NSTs. It's always advisable to keep your
> > gap setting at the maximum size (or less) that provides the
> performance you
> > want.
> > RSGs can run asynchro IF you use a good filter with safety spark gaps
> > total gap settings in the recommended range. Not using all these
> > invites trouble. I would suggest less than 400 bks/sec as a max for
> > I've been working for quite some time now for a reliable replacement
> for the
> > NST especially since the 60 mA units seem to be disappearing rapidly
> > local suppliers. Our unit contains two separate 8 kV coils and a LOT
> > mylar under both coils so they can be either operated as a CT ground
> > (like NSTs) or, the coils may be connected in series, for a 16 kV to
> > unit. These units are designed to be operated in oil so that the
> > product should be quite robust. A standard "Tupperware" type plastic
> > container will serve as a suitable xmfr tank. For greater mobility,
> > intend to offer a steel tank with a phenolic top that is sealed with a
> > gasket.
> > There has been a lot of delays. We finally received the two sets of
> > coils and are awaiting the laser cut cores from Magnetic Metals. We
> hope to
> > have them in our lab and tests completed prior to Dec. 20th.
> > After that, we can start ordering production quantities which will
> > final pricing of these units.
> > Dr. Resonance
> > >
> > > Several posts lately are discussing the use of rotary spark gaps
> > NST's.
> > > I was under the impression that a RSG was not for use with NST's as
> > > cause them to fail. Is this not right?
> > >
> > > randyaz
> > >
> > >
> > >