2008年输电线路冰灾倒塔原因分析  

Analysis on Transmission Tower Toppling Caused by Icing Disaster in 2008

作　　者：李正[1] 杨靖波[1] 韩军科[1] 黄廷政[1] 黄璜[1] 

机构地区：[1]中国电力科学研究院,北京市宣武区100055

出　　处：《电网技术》2009年第2期31-35,共5页Power System Technology

摘　　要：文章通过对酒杯、鼓型和干字三类典型塔型在不同覆冰厚度及工况组合受力下的计算,深入地分析了2008年输电线路铁塔遭受冰灾以致倒塌的原因,分析计算结果与铁塔现场的实际破坏情况一致,总结出铁塔覆冰倒塌破坏的最主要原因在于导线覆冰过载及产生过大的纵向不平衡张力,最后提出了提高线路抗覆冰能力的建议及措施。By means of force condition check of three typical transmission towers, i.e., the cup-type tower, drum-type tower and two-cross-arm tower, under the combination of different ice-coating thickness with different operation conditions, the causes of transmission tower toppling due to icing disaster in the year 2008 are analyzed and calculated in depth. Calculation results conform to actual field damage conditions, and it arrives at the conclusion that the principal reason of transmission tower toppling due to ice-coating lies in the ice-coating thickness exceeds the normal-designed ice load capacity of conductor and the excessive longitudinal unbalanced tension from the former. Finally, the suggestions and measures to strengthen the ice-coating resisting abilitY of transmission lines are given.

关 键 词：输电线路 铁塔倒塌 覆冰 纵向不平衡张力 

分 类 号：TM754[电气工程—电力系统及自动化]