On 7/8/19 3:11 PM, Hal Murray wrote:
[email protected] 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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