Techno-economic analysis of large cross-section conductor for 110 kV power grid reforming in Chongqing

Electric network in Chongqing is too dense and power lines' corridors are precious. For the limitation of the original line section, the capacity of the line can't meet the need of electrical load's development. The large cross-section conductor technology can be used to substantially increase the transmission capacity of overhead lines, and can solve the contradiction between the large demand for transmission capacity and the limited line corridors. The current project situation and technological development level of the big sectional wire power transmission in China were briefly introduced and the feasibility of large cross-section conductor on the basis of expanding the capacity of old 110 kV power transmission line for 30% in Chongqing was analyzed. The best procedure, which can bring the largest social benefit and economical benefit, was proposed through the all-around comparison of static investment and dynamic effect between the different procedures for expanding transmission capacity.