一起覆冰导致500 kV输电线路杆塔受损故障分析
王尊1,陶瑞祥1,郑宏晔1,宋刚2,李泽宇1
(1 国网浙江省电力有限公司电力科学研究院,浙江 杭州 310014;
2 中国能源建设集团浙江省电力设计院有限公司,浙江 杭州 310012)
摘 要 :针对浙江寒潮冻雨期间的一起 500 kV 输电线路杆塔受损故障,通过对跳闸线路出现的杆塔受损进行事故现场勘察、塔材材料检测、导线过载能力和杆塔杆件应力校验计算,推演事故经过为线路过载覆冰后,27# 塔左相导、地线出现不规则脱冰产生的不平衡张力导致 28# 塔头向右侧翻受损,28# 塔中相在铁塔变形过程中与内部主材发生触碰,导致导线在线夹口附近被割断,瞬间失去张力造成 29# 横担扭转及中相导线向大号侧剥离,随后 30# 塔受突发的冲击荷载和导线不平衡张力等原因向内角侧倾倒。根据事故分析提出了提升覆冰监测能力、修订冰区分布图、开展杆塔抗冰校核与加固改造等应对策略,为后续输电线路预防冰冻灾害提供参考。
关键词 : 输电线路 ;覆冰灾害 ;杆塔受损 ;材料分析 ;应力校验
中图分类号 :TM726 文献标识码 :B 文章编号 :2097-6623(2026)04-0047-05
Analysis of a Tower Damage Fault on 500 kV
Transmission Line Caused by Icing
WANG Zun1, TAO Rui-xiang1, ZHENG Hong-ye1, SONG Gang2, LI Ze-yu1
( 1 Electric Power Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310014, China;
2 Zhejiang Electric Power Design Institute Co., Ltd. of China Energy Engineering Group, Hangzhou 310012, China)
Abstract: Aiming at a tower damage fault of a 500 kV transmission line during the cold wave and freezing rain in Zhejiang Province, this paper carries out on-site accident investigation, tower material testing, conductor overload capacity verification and tower member stress checking calculation for the tower damage occurred on the tripped transmission line. The accident process is deduced as follows: after the transmission line was overloaded with ice coating, the unbalanced tension caused by irregular ice shedding of the left-phase conductor and ground wire on Tower 27 led to the rightward overturning damage of the top of Tower 28. During the deformation of the iron tower, the middle-phase conductor of Tower 28 came into contact with the internal main materials, resulting in the conductor being cut off near the clamp mouth. The instantaneous loss of tension further caused the torsion of the cross arm on Tower 29 and the stripping of the middle-phase conductor towards the large-size side. Subsequently, Tower 30 collapsed towards the internal angle side due to sudden impact load, unbalanced conductor tension and other induced factors. Based on the accident analysis, corresponding countermeasures are put forward, including improving the ice coating monitoring capability, revising the ice zone distribution map, and carrying out anti-icing checking, reinforcement and reconstruction of transmission towers.The research results can provide a reference for the subsequent prevention of freezing disasters on transmission lines.
Key words: transmission line; ice disaster; tower damage; material analysis; stress checking
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