随着输电线路的结构荷载的增大，杆塔构件选用大规格角钢是未来特高压杆塔设计的必然趋势。分析了大规格角钢替代普通组合角钢的技术和经济可行性及其应用范围；给出了大规格角钢与常规角钢采购价差对输电线路经济性影响敏感点；结合国家电网“十二五”期间电网建设规模，阐述了未来5年大规格角钢推广应用的影响因素和应用数量，并分析了由此带来的经济效益和社会效益。

The structural load for transmission lines continually increases and application of large angle steels in UHV tower will become inevitable. The paper analyses the feasibility technically and economically for large angle steels replacing normal ones. In addition, the effects of purchase price variances between large angle steels and normal ones on the economy of transmission lines are discussed. Combined with the construction scale of power grid during the 12th Five-Year-Plan period, the factors affecting the large angle steel application, the applicable amount and economic-social benefits are demonstrated in the next five years.