不均匀覆冰导线脱冰塔线体系动力响应特征参数

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Dynamic response characteristics of tower-line systems after ice-shedding from conductors with non-uniform icing

LIU Qinyu'，YAN Bo’，WU Kaiwen'，YANG Hanxu'，LU Jun²，LIANG Ming³，LIU Jiong？ （1. College of Aerospace Engineering， Chongqing University， Chongqing 40o044， P.R. China; 2. State Grid Economic and TechnologicalResearch Institute Co.，Ltd.，Beijing 10ooo0，P.R.China; 3.SouthwestElectric Power Design Institute Co.，Ltd.of China Power Enginering Consulting Group，Chengdu 610oo0，P.R.China）

Abstract：Variation inice thickness with altituderesults inanon-uniform icing distribution onconductors.This study defines non-uniform icing and ice-shedding conditions and employs an additional element method to numerically simulate the dynamic response of tower-line systems after ice-shedding from conductors with nonuniform icing. Finite element models of typical isolated and multi-span tower-line coupling systems for 500kV quad-bundle transmision lines are established，and their dynamic responses are analyzed.Thevariation paterns ofcharacteristicparameters，including load impact factors，maximum reaction forces at connection points， longitudinal unbalanced tension，and de-icing jump height，with respectto line span，elevationdifferenceratio， and icing thicknessare examined under varying structural，icing，and ice-shedding parameters.The strengthof towers under extreme conditions is also analyzed.The obtained results provide critical guidance forthe designof transmission towerheadsin ice-prone regions.

Keywords：transmission tower-line coupling system；non-uniform icing;ice-shedding;dynamic response; numerical simulation

冰区输电线路导线脱冰可能导致电气绝缘间隙不足和结构构件受力过大，引发线路跳闸、导线和金具烧蚀、杆塔倒塌等事故。（剩余15120字）