Re: High Power SRSGs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi DC,

I'm going to try synchronous operation at 120pps and 240pps.  I'm 
currently getting 7 foot arcs at 2Kwatts with 8 inch 1800rpm SRSG at 
120pps and want to make a comparison with asychronous 
operation.  Since I have a 1/4HP motor,  Im thinking I should not go 
larger than a 15 inch disc. Yeh, the cap will be more expensive, but 
what the heck :-))

Gerry R.

> 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.