Re: High Power SRSGs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>



This works out to 575 pulses/sec.   At this firing rate, it's 
important to allow a powerful current flow into the pole xmfr primary 
to very rapidly recharge the caps.  It's also important to use the 
very best caps with low ESR and low inductance, ie, Maxwell or 
equivalent.  We usually run 50-70 amp range on the primary reactor 
for rapid recharge.  The sec. sparks grow to enormous length at this 
firing rate.

Dr. Resonance


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, March 27, 2006 9:39 AM
Subject: Re: High Power SRSGs


> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
>
> I run asynchro with 4 spark gaps at that power level.  We run 3450 
> rpm with 10 electrodes on 17 inch dia. spacing (18 inch dia wheel) 
> and get spectacular performance at 7.5 kVA on our 18 inch dia x 52 
> inch long coil. 9-10 ft sparks at 8-9 kVA.
>
> Dr. Resonance
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Sunday, March 26, 2006 4:43 PM
> Subject: Re: High Power SRSGs
>
>
> > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> >
> > Hi DC,
> >
> > This makes sense as I'm using 1/8 tungsten for this rotary.  The 
> > next one I'm starting on will use 3/8 tungsten for the flying 
> > electrodes and maybe 1/2 inch for the stationary ones.  The power 
> > level using a 5KVA PIG will hopfully be between 5 and 8KVA.   The 
> > rotor will probably be 15 inches diameter with electrodes on a 13.5 
> > inch diameter circle and will also be synchronous at 1800rpm.   I'm 
> > still debating on whether to use two or four stationary 
> > electodes.  Im thinking that with four, the gap effectively closes 
> > and separates at twice the speed and I'm wondering if this helps 
> > things more than the extra losses thru four gaps.
> >
> > Gerry R.
> >
> > > Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
> > >
> > > Try using 1/2 inch dia. fixed electrodes and you won't get power 
> > > arcing which results from insufficient cooling at the electrode 
> > > surfaces --- red hot electrode ends promote power arc 
> > > formation.  I run just two sparkgaps not four with all NST 
> > > configurations at or below 120 mA.  At 180-200 mA we go to 4 
> > > stationary electrodes.
> > >
> > > Dr. Resonance
> > >
> > >
> > >
> > >
> > > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > > >
> > > > Hi All,
> > > >
> > > > The SRSG I built for my NST farm (15KV 120ma) has two static and 
> > > > 4 flying electrodes and arcs thru two gaps.  The 8 inch diameter 
> > > > disc runs at 1800rpm (120pps) and the four flying electrodes are 
> > > > all electrically connected together and rotate on a 6.5 inch 
> > > > diameter circle .  I have noticed that at the 2KW level, I might 
> > > > be seeing the beginnings of power arcing.
> > > >
> > > > Question:  for higher power levels it is certainly beneficial to 
> > > > go to a larger disc, but is it also beneficial to have four 
> > > > stationary electrodes and arc thru 4 gaps??
> > > >
> > > > Gerry R.