考虑水滴粒径分布的导线覆冰过程中水滴碰撞特征

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Collision characteristics of water droplets during conductor icing considering droplet size distribution

WU Haitao'，WANG Qian'，XIAO Qianbo'，ZOU Anxin²，LIU Jia'，WU Bin'， GUO Sihua'，HE Gaohui³ （1.Electric Power Research Institute of State Grid Chongqing Electric Power Company，Chongqing 400074， P.R. China; 2. State Grid Chongqing Electric Power Company， Chongqing 400014， P.R. China; 3. College of Engineering and Technology，Southwest University， Chongqing 400715，P.R. China）

Abstract：Existing conductor icing models primarilyrely on four environmental parameters：median volume diameter （MVD）of water droplets，liquid water content， wind speed，and ambient temperature， while giving limitedattention to droplet size distribution characteristics.This study adopts theLangmuir droplet size distribution spectrum as abasis to develop finiteelement andanalytical models for simulating water droplet collision characteristics on conductors.It compares the water droplet collision coefficient α1 calculated using the droplet size distribution spectrum with that obtained using MVD.Additionall，the concept of the characteristic medianvolumediameter dx is introduced.Results show that， compared to the finite element method，the analytical method ofers significantadvantages interms ofsimplicityand computational effciency，with anaverage errorof approximately O.1.The error Δa1 between a1 calculated using MVD and that derived from the size distribution spectrum depends on the distance between MVD and dx . The closer MVD is to dx， the smaller the Δa1 is， and vice versa.

Keywords： transmission lines;icing prediction; water droplet size; environment parameters

随着全球气候变化，中国南方地区电力架空输电线路在冬季发生覆冰的现象十分常见，覆冰可造成输电线路过载、舞动、短路、断裂、杆塔倒塌等灾害，对电力输送安全形成巨大威胁。（剩余10676字）