AM64
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The loss in transmission lines is quantified by the heating loss value I^2*R pronounced “eye squared R” where I is the line current in the phase and R is the total line resistance. Power is V*I thus you can keep power constant and quarter the heating loss is you double the line voltage. This physical property is why long distance transmission lines operate in hundreds of thousands of volts. However at that crazy potential you actually get leakage thru the isolators too to Mother Earth which increases total transmission loss. I’d really doubt the line loss is in the 50% range but don’t honestly know.
I was driving along a back road a few years ago and saw a huge flock of birds take off from a field headed my way. I figured I was a real target - apparently they weren't in the mood. Anyway one bird flew between the transmission lines and created a great ball of fire. It was impressive; too bad the Killer wasn't there to see it.
Seems like the line losses would be variable and highly dependent on the length of the power lines. The "R" isn't squared, but big numbers in the denominator are still not good in cases like transmission losses.