Pigs can fix the grid

The kind of pig I am talking about is not the kind of pig that bacon comes from but instead the kind of pig that is a sensor and maintenance platform used for pipeline maintenance (like BP should have used if they wanted to keep the Purdoe Bay pipelines from corroding to the point of failure.) Ok I am not here to judge, I am here to suggest.
The new kind of pig is for the power distribution industry to help them maintain the “grid”. This pig would perform a high wire act crawling along the steel high tension lines that transmit power at 100s of KV over long distance. It could use ultrasound to check the lines for corrosion (rust), since I didn’t miss speak, the lines on those massive towers are not copper or aluminum they are steel (as in an alloy of iron and carbon) because while steel is not as good a conductor as Cu or Al it is much cheaper and stronger. The pig which would actually be a robot could also be used to impregnate the lines with anticorrosive agents to help them last longer and even better if the anticorrosive agent was also conductive increase the amount of power the lines could carry. If the pig makers were ambitions people they would also put a knitting mechanism on the pig since by knitting on more wire the transmission capacity of the lines could be increased while the line was still energized (which can’t be done by traditional means).
Even if it is impractical or illegal to increase the carrying capacity of high tension lines by adding more conductors, simply wrapping them in fiberglass or Kevlar ribbon could strengthen them immensely. By strengthening the lines they could be prevented from sagging and breaking under high current (or wind) loads, which makes the whole grid more efficient. This would allow the grid to expand its capacity, without major upgrades, especially if more conductors were added and then the lines were wrapped in reinforcing ribbon.
Before I end let’s come back to the anticorrosive agent real fast. Since every one is so hot on nanomaterials now, if the anticorrosive contained reducing agents and nanocrystaline metal particles then the heat of the tiny arcs caused by microfractures in the lines could actually be used to repair the lines at a microscopic level, by melting and filling in the factures. (Actually crystalline material even nanocrystaline is bad, it would be best to actually to make the metal particles into amorphous solids, so they could extend and join the crystal lattices on either side of the fracture.)