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为了减小±1 100 kV特高压直流输电线路杆塔尺寸和降低其工程造价,参照典型的±1 100 kV特高压直流输电线路工程设计条件,基于电磁环境、绝缘子串长和V串夹角、空气间隙的边界条件,对直线塔极间距进行优化研究,得到直线塔最小极间距;综合考虑电磁环境、对相邻直线塔的影响等因素,计算和分析耐张塔的最小极间距.对V串伸入塔身的悬挂方式和Y型绝缘子串的应用进行分析,得到适用的条件.为后续特高压直流输电线路的设计提供参考.“,”In order to reduce the tower size and project cost of 1100 kV UHVDC transmission line,according to the design conditions of typical ±1100 kV UHVDC transmission line,the paper studies the polarity distance optimization of suspension tower from the aspects of electromagnetic environment,the length of the insulator string,the angle of V-style insulator string and air gap,and gives the minimum polarity distance of the suspension tower.In addition,the paper calculates and analyzes the minimum polarity distance of strain tower by considering the electromagnetic environment and the influence on adjacent suspension tower,and discusses the application of the V-style insulator string extended to tower body and Y-style insulator string are analyzed.