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400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw

400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw.Permissible Line Loading as per CEA Standards

+/- 500 kV HVDC bi-pole line=Pole Capacity X Number of Pole in service

765 KV line having 4 X 686 sq. mm conductor =2250 MW per circuit

765 KV line having 4 X 686 sq. mm conductor operating at 400 kV =614 MW per circuit

400 KV line having 2 X 520 sq. mm conductor with shunt reactor =410 MW per circuit

400 KV line having 2 X 520 sq. mm conductor without shunt reactor =533 MWper circuit

400 KV line having 2 X 520 sq. mm conductor operating at 220 kV =155 MW per circuit

220 kV line =132 MW per circuit

132 kV Line =50 MW per circuit

source:http://www.mahatransco.in/oa/draft_procedure_calculation_transmission_availability.shtm

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