某±800 kV特高压架空输电线路光缆覆冰事故分析  

Analysis of Optical Cable Icing Accident on a±800 kV UHV Overhead Transmission Line

作　　者：李志刚 吕宝华 王旭海 赵丹 马江波 周文武 LI Zhigang;LYU Baohua;WANG Xuhai;ZHAO Dan;MA Jiangbo;ZHOU Wenwu(Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi'an 710075,China;State Grid Shaanxi Electric Power Company Construction Branch,Xi'an 710065,China;School of Automation,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]中国电力工程顾问集团西北电力设计院有限公司,陕西西安710075 [2]国网陕西省电力有限公司建设分公司,陕西西安710065 [3]武汉理工大学自动化学院,湖北武汉430070

出　　处：《电力勘测设计》2025年第1期26-29,37,共5页Electric Power Survey & Design

摘　　要：受极端雨雪冰冻天气影响,某±800 kV特高压架空输电线路光缆发生覆冰断线事故。本文从设计校验、现场调查、金相和微观检查等方面分析断线原因,认定本次事故主要由于光缆遭受雷击,单丝烧蚀受损未及时消缺,叠加冻雨覆冰,导致光缆力学特性超屈服强度断裂。根据断线原因,提出设计阶段需加大对微地形和微气象识别,差异化设计增强本质安全,运维单位根据线路附近遭受雷击情况多手段增加线路导地线巡查。Affected by extreme freezing rain,snow and other severe weather,an ice-covered broken line accident occurred in the optical cable of a±800 kV UHV overhead transmission line.In this paper,the causes of wire breakage are analyzed from the perspectives of design verification,field investigation,metallographic and microscopic examination.It is concluded that the accident is mainly due to the lightning strike of the optical cable,the failure of the single wire ablation damage to eliminate the defect in time,and the superposition of freezing rain and icing,resulting in the super yield strength fracture of the mechanical properties of the optical cable.According to the reasons for the disconnection,it is proposed that the design stage should increase the identification of micro-topography and micrometeorology,and the differentiated design should enhance intrinsic safety.The operation and maintenance unit should increase the line conductor and ground wire inspections according to the lightning strike near the line.

关 键 词：架空输电线路 特高压 覆冰事故 冻雨 

分 类 号：TM75[电气工程—电力系统及自动化]