中文摘要：

导线最大表面电场与高压直流输电线路电磁环境水平密切相关,研究架空绞线参数对其表面电场的影响规律,有益于工程设计和环境保护。为此,给出了一种计算绞线表面电场的方法,使用绞线表面电位和切向电场分量验证了计算方法的有效性。使用该方法得到的计算结果表明：绞线外层铝线最突出的顶端处电场较大;单根绞线最大表面电场约为相同外径光滑导线的1.4倍,外径的变化基本上不会影响绞线表面电场的变化规律;对于分裂绞线,其每一子导线最大表面电场的变化规律与单根绞线的基本一致。

英文摘要：

The maximal electric field on the conductor surface is closely related to the electromagnetic environment level of HVDC transmission lines. Studying the influence laws of overhead stranded conductor parameters on the electric field on the conductor surface is beneficial to engineering design and environment protection. Consequently,we put forward a computation method for the electric field on the stranded conductor surface,and verified the validity of this method by using the voltage and tangential electric field component on the stranded conductor surface. The computation results obtained with this method are shown as follows. The electric field at the most prominent top of the outer aluminium wire of stranded conductor is larger. The maximal electric field on the single stranded conductor surface is about 1.4 times that at the surface of smooth conductor with the same outer diameter,and the change of the outer diameter of stranded conductor can hardly affect variation laws of the electric field on the stranded conductor surface. For stranded conductor bundle,the variation law of the maximal electric field on each subconductor surface accord with that on the single stranded conductor surface.