In a main power grid there are mainly three types of power lines: Large 400 and 220 kilovolts power lines, which would be suspended in the air, and 110 kilovolt power lines. Lines can also be buried in densely populated areas. A power line is a types of transmission line. Other types of transmission lines are: wires, coaxial cables, dielectric slabs, striplines, optical fibers, and waveguides.
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