特高压输电线路地面最大工频电场强度和导线最大弧垂特性

Study on Characteristics of Maximum Power Frequency Electric Field Gradient on Ground and Maximum Sag of Bundle Conductor for UHVAC Transmission Line

研究特高压输电线路几何参数与地面最大工频电场强度的关系和地面最大工频电场强度的特点，给出2种基本分裂导线排列方式的导线最小对地高度和走廊宽度。分析特高压输电导线运行温度和最大弧垂的特点。从特高压输电导线最大弧垂变化和输电运行方式两方面，讨论特高压输电导线地面最大工频电场强度限值10—12kV／m的安全与经济的合理性。最后，提出特高压2种基本杆塔结构（猫头塔和酒杯塔）的几何参数供参考。

The relation between geometric parameters of bundle conductor for UHVAC transmission line and the maximum power frequency electric field gradient on ground as well as the characteristic of the maximum power frequency electric field gradient on ground are studied; and the minimum heights of conductors above the ground and the widths of corridors for two basic conductor arrangements are given. The characteristics of operating temperature and the maximum sag of bundle conductors for UHVAC transmission line are also researched. From two respects, i.e., the variation of maximum sag of bundle conductors and the operating modes of power transmission for UHVAC transmission line, the reasonableness of security and economy of the limited range from 10kV/m to 12kV/m for maximum power frequency electric field gradient on ground is discussed. Finally, the geometric parameters for two basic kinds of UHVAC power transmission towers, i.e., the cathead tower and cup tower, are proposed.