Re: WinTesla Equations Version 5.5

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


I have a nice 30 kV DC power supply with full metering of both potential and
leakage current.

I will take some breakdown measurements this week of 100 mils, 200 mils, 300
mils .... out to 750 mils (1 mil = 1/1000th inch) using a standard
stationary TC spark gap.

We have round tungsten electrodes 1/2 in dia for the measurements.   I will
post them to the list and perhaps Scott can use this data in his excellent
WinTesla program.

Dr. Resonance




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, October 26, 2002 1:48 PM
Subject: Re: WinTesla Equations Version 5.5


> Original poster: "Lee Hennes by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<leehennes-at-cox-dot-net>
>
> Hi all...
>
> OOOPS! I gave you a formula for breakdown voltage in dry air at sea level.
The
> formula was fine but I had a brain fart on the units. The formula again
is:
>
> v = 2440 d + 61 d^2
>
> v:  kilovolts
> d:   gap in meters  (NOT inches as I previously said!)
>
> converting the formula to inches gives us:
>
> v = 61.9760 d + 1.5494 d^2
>
> Therefore using this formula it would take 63.6 kv for the 1 inch gap. A
gap
> supplied by a standard 15kv NST  breaks down at a 0.25" gap which is
> reasonable.  The reference is: High Voltage Engineering by M. Khalia,
Marcel
> Dekker, Inc., 1990. Sorry for my math blunder. I am sure some of you were
> scratching your head when you tried to use the previous formula....
>
> Lee
>
> Tesla list wrote:
> >
> > Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <resonance-at-jvlnet-dot-com>
> >
> > The 8.7 kV/in was a measurement for sec. coil discharges, not in the
primary
> > circuit.
> > This value was measured with a coil running at 7.5 kva.
> >
> > Dr. Resonance
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Friday, October 25, 2002 10:30 AM
> > Subject: RE: WinTesla Equations Version 5.5
> >
> > > Original poster: "Lau, Gary by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> > <Gary.Lau-at-hp-dot-com>
> > >
> > > I would suggest that WinTesla make no attempt to calculate static gap
> > > spacings.  This is something that must be determined experimentally,
since
> > > everyone's electrode geometry (and altitude!) will be different.
While a
> > > ballpark figure would be useful, I fear that nubies seeing a figure
> > > generated by a widely used computer program would take that as Gospel
and
> > > make no further attempt to set the gap experimentally.
> > >
> > > But even as a ballpark, do you really believe that a 6kV NST (8.4kV
peak)
> > > will jump a 1 inch gap?  Certainly not at sea level!
> > >
> > > Regards, Gary Lau
> > > MA, USA
> > >
> > >
> > > >Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > > <Rscopper-at-aol-dot-com>
> > > >
> > > >Looks to me like no one really knows what the correct equation should
be.
> > If
> > > >we all decide on one I'll put it in WinTesla Version 5.5.  There's
quite
> > a bit
> > > >of work to do on the rotary spark gap section anyway.  8400V/in was
good
> > > at the
> > > >time I wrote Version 3.2 over 2.5 years ago.
> > > >
> > > >R. Scott Coppersmith
> > >
> > >
> > >
>
>
>
>