the basic parameters of transmission lines are R,L,C and G...........
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The two basic categories of transmission are:High voltage transmission andLow voltage transmission.
(a) voltage and current readings vary with position along the transmission line, (b) voltage and current are difficult to define in non-TEM transmission lines.
Its just a matter of standard. In my area, for instance, we use 13.2 KV for distribution lines, and 69 KV / 138 KV for transmission lines.
336 776 and 795
That is depends on the factor of sag and clearance required. And also on the level of voltage transmission used.