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Re: synchronous RSG or not
Then you're using a fairly large cap size (.075uF). This does support Gary's
post. I think he pointed out something we tend to overlook at times.
Bart
Tesla list wrote:
>
> Original poster: "D.Wightman" <dwightman-at-mmcable-dot-com>
>
> im sorry that i had forgotten to give more of the specs of the coil...i am
> using 2 maxwell 15kv .15 caps in series, also a miller welder with a
> variable shunt,, "a hand crank knob that raises or lowers the core to the
> transformer in the welder instead of a selector switch" it is running in my
> airplane hanger which has limited power to it ..so amperage was at the most
> 28 amps,, but the voltage will drop to 189 volts..ya i know,,,im at the end
> of a long row of hangersalmost 200 feet from the power supply to the
> building, and it is wired with #12 wire, yes it gets warm...the voltage drop
> is most likely whats saving the caps since with 2 im rated at 30 kv,,,im
> getting 1 more.....
> -----Original Message-----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> Date: Sunday, July 30, 2000 3:15 PM
> Subject: Re: synchronous RSG or not
>
> >Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net>
> >
> >Interesting observations.
> >
> >An SRSG at 120 bps can be phased to fire at each peak of the AC 1/2 cycle.
> One
> >can also run SRSG's at 240, 480, etc.. bps rates, but I doubt an SRSG gap
> rate
> >above 120 will show any improvement (probably a loss of spark length). You
> have
> >demonstrated what is "nice" about a DC drive spark gap. With DC, varying
> the
> >break rate is simple and odd things do occur at different rates of the
> break.
> >Although I run an SRSG currently, I have ran DC and I loved being able to
> >adjust the break rate while the system is running. My particular coil had
> >longest arc lengths at around 270 bps at that time (I didn't try extremely
> high
> >rpm though).
> >
> >I am curious however, what size capacitor are you using?
> >
> >Tesla list wrote:
> >>
> >> Original poster: "D.Wightman" <dwightman-at-mmcable-dot-com>
> >>
> >> Recently i ran my 8 inch coil at various speeds on my rsg. it has 6
> rotating
> >> electrodes and 2 fixed electrodes,the drive motor is d/c with a built in
> >> tachometer..The coil is powered by a 14400 * 5kva pole pig..the rpms were
> >> from
> >> 1000 to 5000 rpm...all of this is on video tape which is 30 minutes
> long..an
> >> interesting phenomona happens..at fairly low power levels and slow rpms
> the
> >> coil will function very well it was easy to get 5 foot ars, by turning up
> the
> >>
> >> rpm of the rsg at this point there is no visible improvement in
> performance..
> >>
> >> when you turn the power up to the coil it would tend to want to arc down
> the
> >> secondary, and also hit the secondary..by increasing the rpms of the rsg
> at
> >> this point it would seem to go back into tune and the destructive arcing
> >> would
> >> stop..at this point you can really crank up the power to the pole pig and
> get
> >>
> >> nearly constant 8 and one half and 9 and one half foot sparks.. this
> >> secondary
> >> coil is only 25 inches high!!!! now upon further experimentation...at
> full
> >> power..rsg at 5000 rpm 10 foot sparks super hot, hitting a metal support
> beam
> >>
> >> for building we would begin to adjust the speed of the rsg..down at
> approx
> >> 2000
> >> to 1000 rpm the destructive arcing would propagate..arc length was
> effected
> >> by
> >> at least 10 to 15% "reduced arc length"..at 700 to 1000 rpm you would see
> >> white
> >> hot spots on the secondary coils,by turning the rsg at that point
> immediatly
> >> back to the 2500 to 3500 rpm range the hot spots went away and the unit
> was
> >> really getting with the program. at that point the rsg was turned up to
> >> around
> >> 5000rpm, it seemed that power output was slightly reduced maybe 5 %...
> >> unfortunatly this experimentation has destroyed the secondary but the
> results
> >>
> >> are very interesting for those of you who would like a copy of the tape
> let
> >> me
> >> know.. in the end, you will see it with lots of smoke pouring out of the
> >> secondary and a small fire .....these things are GREAT...now for the
> question
> >>
> >> one must ask...why do most perfer synchronous rsg's?? what is the point..
> it
> >> did seem that a spark gap can be tuned for a specific power level....does
> >> synchronous operation tend to mostly protect the caps or the
> >> transformer.....i
> >> realize that the 60hz a/c cycle can be optimized, sort of,, by selecting
> a
> >> rpm
> >> on a rsg that tends to "hit" at the peak of each cycle...but i really did
> not
> >>
> >> see this..thanks everyone.
> >
> >
> >
> >