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Re: Computer data
From: DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Monday, September 01, 1997 11:59 AM
To: Tesla List
Subject: Re: Computer data
To: Greg
Bill had two more large toroids connected to the Model 10 (both approx 6
ft. dia) to achieve the 30-32 ft spark length. Additional capacitors were
added to bring the system back into resonance. This was done just for
these specific tests and to gather some data. Sorry I didn't mention this
earlier.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Re: Computer data
> Date: Sunday,August 31,1997 10:44 PM
>
>
> From: DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent: Sunday, August 31, 1997 9:33 PM
> To: Tesla List
> Subject: Re: Computer data
>
> to: Greg
>
> Thank you for the update. Will get to work on this later this week and
> advise. Hope the information will be of assistance in your large
project.
>
> DR.RESONANCE-at-next-wave-dot-net
>
>
> ----------
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> > Subject: Re: Computer data
> > Date: Sunday,August 31,1997 7:33 PM
> >
> >
> > From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
> > Sent: Sunday, August 31, 1997 2:41 PM
> > To: Tesla List
> > Subject: Re: Computer data
> >
> > DR.RESONANCE wrote:
> >
> >
> > > Even without CW the tank current will dip as noted on the primary
side
> > > ammeters. We did this experiment in Calif. in 1981 with Bill Wysock
> > > running one of
> > > his large coils -- I believe it was a model 10. The coil output was
> around
> > > 32 ft. long spark.
> >
> > Bill certainly has an unusual way of rating the performance of his
coils.
> He
> > may be stretching things a bit to derive a 32 ft. arc length, at least
> from
> > the pictures shown in http://www.ocws-dot-com/tesla/model10.html.
> > It appears that he measures the peak _diameter_ of the arc striking
> range,
> > rather than the actual arc length. This could explain the 55 ft.
claims
> made
> > in the second photo at http://www.ocws-dot-com/tesla/model13.html. Tesla
> also used
> > this peak diameter measurement method at one point to measure the
> performance of
> > his Colorado Springs expmt, where he describes the arcs as being "50 ft
> across."
> >
> > > The power supply was set up with a continuously
> > > variable series inductor and a standard parallel variac stack. As we
> ran
> > > the power up thru the voltage variac in small increments we made
small
> > > adjustments to the series inductor. At almost any setting above 50%
> power
> > > level (the range we are most interested in) as one increased the
variac
> > > (voltage) the current would begin increasing as well. At some point
as
> the
> > > power factor begins to correct back to unity (phase meter across
input
> > > line) the primary 240 vac side of the power supply will indicate a
> 5-10%
> > > drop in the primary current to the power transformer. This is what I
> refer
> > > to as the most efficient point of operation. The current actually
> "dips"
> > > just like a plate milliammeter in a ham radio transmitter. It's not
as
> > > dramatic, but the effect is quite evident. From this point the
voltage
> > > variac is increased more and the primary current once again begins to
> climb.
> >
> > I understand now what you mean by dipping the input current, by tuning
> the
> > effective _power factor_ of your system, not it's resonant frequency.
> > I think that yours is the first attempt I've heard of to tune for
optimum
> > power factor! That is definitely a good capability to have, especially
> if you
> > are operating near the kVA limit of your feeder!
> >
> >
> > [snip]
> > > I might
> > > suggest you incorporate several taps into your limiting inductor
system
> and
> > > you will be able to "tune" your power supply as well as your
resonance
> > > points. A continuously variable inductor demonstrates these
principles
> in
> > > dramatic effect but this would be a lot of work to construct for your
> very
> > > large system. A phase shift indicator illustrating where unity is
> while
> > > your system is running is a very valuable addition to your
> instrumentation.
> >
> > Unfortunately the PF is not adjustable on my setup, as the HV power
xfmrs
> are
> > switched directly onto the 480V mains without the use of variacs or
> limiting
> > inductors (power is controlled by rotary gap speed). However, on a DC
> resonant
> > charger the PF is usually well above 0.9, since the inductive reactance
> of the
> > charging inductor exactly cancels the capacitive reactance of the
primary
> > capacitor bank as seen by the HV xfmrs.
> >
> >
> > > Regarding the data I posted .... does it agree with any of your
> measured
> > > values of current input vs spark length output for your old system
with
> the
> > > 0.18 MFD capacitor???
> >
> > I cannot say for sure, since I measured my mains current at 480V
3-phase.
> > However, if I assume that your mains current values are for 240V
1-phase,
> then
> >
> > Your prediction - at 90 amps input (21.6kVA) x = 21 ft. long sec.
> spark
> > at 108 amps input (25.9kVA) x = 25.2 ft. long sec.
> spark
> > at 130 amps input (31.2kVA) x = 30.3 ft. long sec.
> spark
> >
> > Observed (Bert Pool's Austin pics) at about 21kVA x = 20(avg) to
> 25(rare) ft.
> > I would say that your data is in good agreement, for at least this one
> data point.
> >
> >
> > -GL
> >
> >
>
>