"The Natural Philosopher" wrote in message
...
On 28/07/14 08:22, John Williamson wrote:
On 28/07/2014 02:03, The Natural Philosopher wrote:
On 27/07/14 22:45, tony sayer wrote:
In article ,
scribeth thus
Nightjar wrote:
AC for simple long-distance transmission...
Except for underwater cables, where it can cause unacceptable
transmission losses.

How does immersing a 11kV AC cable in water increase transmission
losses? This isn't a joke question, I can't see how the medium
surrounding a cable changes the action of the cable itself, other
than cooling effects.

jgh

Inductive and Capactive losses theres some stuff on the AAB website
somewhere;!...

Not sure that induction plays any part..

Transmission lines have a calculable inductance per metre, and as the
length approaches infinity, so does that inductance.

There is a characteristic impedance for transmission lines, which
affects both transmission and losses.


So, having taught grandmother to suck eggs, where is the power loss due to
inductance?

The loss arises from energy taken to reverse the magnetic field.
https://en.wikipedia.org/wiki/Magnetic_hysteresis