Research on 750kV Transmission Line Unbalance in a New Transposition Method

At present, 750kV transmission lines basically use two transposition auxiliary sub-tower plus a base of tension-resistant tower transposition method, a whole cycle using two or three transposition points. This traditional way covers a large area, high investment, and the topography of the transposition point requires gentle, in addition to the line lightning protection performance deterioration. This paper proposes a new type of transposition method, using two-phase transposition at each place, canceling the transposition of the sub-tower, through the construction of the simulation model of the transposition of the line imbalance simulation calculation, the results show that the transposition can really save line investment, improve the safety and reliability of operation.