某±800kV直流线路地线断裂原因分析及建议  

Cause Analysis and Suggestion on Ground Wire Fracture for a±800 kV DC Transmission Line

作　　者：刘庆丰 李辉 陈路 侯长健 LIU Qingfeng;LI Hui;CHEN Lu;HOU Changjian(China Energy Engineering Group Hunan Electric Power Design Institute Co.Ltd,Changsha 410007,China)

机构地区：[1]中国能源建设集团湖南省电力设计院有限公司,湖南长沙410007

出　　处：《湖南电力》2020年第2期37-41,共5页Hunan Electric Power

摘　　要：某800 kV直流线路的地线因覆冰过重发生断裂,事故造成线路单极闭锁故障,线路长时间处于单极运行状态。通过输电线路电气计算软件从地线覆冰不平衡张力、地线下倾角、脱冰跳跃等方面进行综合分析计算,得出地线覆冰不平衡张力和悬垂线夹损坏后地线发生滑移是本次事故的主要原因。根据事故分析情况提出治理建议,为后续工程设计提供参考。The ground wire of a 800 kV DC transmission line broke due to heavy icing,which resulted in single pole blocking fault and a single pole operation state for a long time.Through the comprehensive analysis and calculation of the unbalanced ice covering tension of the ground wire,the dip angle of the ground wire,the ice breaking jump and other aspects by the electrical calculation software of the transmission line,it is concluded that the unbalanced ice covering tension of the ground wire and the slip of the ground wire after the damage of the suspension clamp are the main causes of the accident.According to the analysis of the accident,some suggestions are put forward to avoid similar accidents again,which also provides reference for the followup engineering design.

关 键 词：地线覆冰 覆冰不平衡张力 脱冰跳跃 

分 类 号：TM643[电气工程—电力系统及自动化]