Electric network in Chongqing is too dense and power lines’ corridors are precious. For the limitation of the original lines’ sectional area, 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. This paper introduces simply the current project situation and technological development level of the big sectional wire electric transmission technology in China and analyzes the feasibility of large cross-section conductor on the basis of expanding the capacity of old 110kV power transmission line for 30% in Chongqing. The best procedure, which can bring us the largest social benefit and economical benefit, has been proposed through the all-around comparison of static investment and dynamic effect between the different procedures for expanding transmission capacity.
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