[time-nuts] A Research Proposal

[Dana Whitlow]

I'm surprised that the VF of HV transmission lines is noticeably less than
unity, given
that the dielectric is just air.  Or does the distributed resistance do all
the damage?

Dana


On Mon, Jul 8, 2019 at 8:00 PM jimlux <jimlux at earthlink.net> wrote:

> On 7/8/19 3:11 PM, Hal Murray wrote:
> >
> > glenlist at pacificmedia.com.au said:
> >> I think  people getting confused with the phase of measured current to
> the
> >> voltage .
> >
> > No, we have been discussion the phase angle between 2 geographically
> separated
> > locations connected by a power line.
> >
> > Consider the simple case of a generator, 100 miles of line, and then a
> light
> > bulb.  The voltage at the light bulb will be delayed by the speed of
> light.
> > That delay can be expressed as a fraction of a cycle and converted to a
> phase
> > angle.
>
> >
> > It gets much more complicated if you have multiple generators, multiple
> loads,
> > and various transmission lines, and even more complicated when you turn
> things
> > on and off.
>
>
> The transmission line is decidedly not Velocity Factor =1.0
>
> A typical propagation constant might be j0.0018/mile
>
> about 5500 km/wavelength at 60 Hz.
>
> Free space propgation delay for 5500 m is 18.5 milliseconds - compared
> to 16.67 millisecond period of 60Hz.  A velocity factor of about 90%
>
> (that's for an example I found for 765 kV, using Tern conductors, in
> bundles of 6
>
> http://home.engineering.iastate.edu/~jdm/ee552/Transmission.pdf
> )
>
>
> >
> >
>
>
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