Electric coal mining equipment is cord-connected. Even enormous
draglines ("steam" shovels on steroids) are typically cord connected
with 13 kV cables. It is a mature science. Coal mining equipment has
been electric powered since the early 1900's. Specialized cables, reels,
transformers, and equipment for the mining industry. Easily transferable
technology to agriculture.
They typically put a reel on the back of the mining machine that pays
out (or pulls in) the cable as needed. They have a "load center"
transformer that is moved around as the mining process proceeds.
Electric shuttle car for underground coal transport from working face:
http://www.undergroundcoal.com.au/fundamentals/11_face.aspx
Nifty tutorial on cables for mining EVs:
http://www.cdc.gov/niosh/mining/content/deratingfactors.html
Dragline cable:
http://www.miningphoto.com/details/2140/dragline_working_in_background_removing_overburden_with_drill_rigs_drilling_blas
Bill Dube'
(Used to work as an Electrical Inspection intern for the Mine Safety and
Health Administration, MSHA)
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