Electronics > Projects, Designs, and Technical Stuff
Power transfer from power lines using induction
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maxwell3e10:
For capacitive coupling the key is a long length of the pick-up wire. Suppose that you run a wire from one pole to the next, parallel to the HV wire. If the distance between poles is 100 meters and the pick-up wire is 3 meters away from the 10 kV line, then the mutual capacitance is about 400 pF. For optimal power extraction one needs a HV transformer that steps down the voltage from 5 kV to the usable level. The power that can be extracted if the pick-up wire is maintained at 5 kV is 4 Watts. So, perhaps it is not so far off.
Siwastaja:
Although, if you run a capacitive pickup wire full-length from pole to pole just to extract power, you could have just as well ran a cable (fiber preferably) for the communication directly...
maxwell3e10:
I think the idea is that for straight lines one could get away with having a relay station every 10th pole or something.
Someone:
Lets see if this link works:
https://researchbank.rmit.edu.au/eserv/rmit:162090/Rodriguez.pdf
Rodriguez, J., 2017. Electric field energy harvesting from medium voltage power lines.

Fairly recent and comprehensive review of the options.
L_Euler:
For the cost to design and implement an inductive capture system, do you think solar may be just as economical.  The trees are already cleared.
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