This might be typical...
Small x-section area is important as it has to go through a pressure gland and you don't want to make a 'piston' which might push the cable up.
That's desirable, but if there's too much lag around the loop, you can't rely on feedback to get it. Brute force - like a big enough Zener - can fill in.
What kind of power levels do you want to transfer ?
If this is a DC feed, why would be some skin effect issues ?
According to the link, the maximum cable voltage is 1200 V and resistance 13.5 ohms/km thus the 10 km drum would have 135 Ohms. If the ground return resistance is similar, the full loop resistance is about 250 Ohms.With a 1000 V feed and 2 A current, only 500 V would reach the load i.e. 1000 W. This is the maximum power since equal power is lost is the wire resistances as in the load.
If the loop current is only 0.1 A, only 25 V (2.5%) is lost and the load will get 975 V or 97 W. Not much (or any) regulation needed even if a shorter drum is used.
Not me, but kilowatts for motors isn't unusual.
I was referring to Fred's suggestion that remote voltage sensing could be effected via telemetry rather than use a negative impedance supply. It can, but skin effect makes telemetry harder, it's a steel outer, so pretty bad. The signal levels are small, the attenuation is high, and the motors may be big and noisy, so the game is often not worth the candle.
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it would have to be at the far end of the cable, pretty accurate, and in the case of an adjustable supply, adjustable
The accuracy required is determined by the breakdoown voltage of the parts being driven. There's no absolute requirement for precision.
If it is at the far end of the cable, the clamp voltage is obviously set by whatever is being driven, and since it would be installed separately it is obviously adjustable (in the sense that you buy what you need before you fitted it).
I want to design some multi-channel low-cost programmable power supplies, and remote sense would be a nuisance and burn connector pins. RS has hazards too, more hassle to adjust for.
Programmable +- output impedance is easy, just a little more FPGA code. I'll know the output voltage and current.
I guess I should simulate a bunch of cases, especially complex remote loads with input capacitors and switching (negative input impedance) power supplies.
Whatever you do, you are not going to transfer much over 1 kW (,ax power transfer theorem, with the same wiring resistance as the load resistance over the discussed cable.
To increase the power delivered, you have three options:
Select one or more options to deliver multiple kilowatts.
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