陈浩,田峰,张涛,谢利明,孙云飞
CHEN Hao,TIAN Feng,ZHANG Tao,XIE Liming,SUN Yunfei

• 1:内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司
• 2:内蒙古自治区高电压与绝缘技术企业重点实验室

摘要(Abstract)：

利用宏观检验、化学成分分析、显微组织检验、断口形貌分析、硬度测试及数值仿真等试验方法对某110 kV输电铁塔悬式绝缘子钢脚的断裂原因进行了试验分析。结果表明，输电线路所经地区地势相对平坦且风速均匀稳定，同时冬季气温较低及昼夜温差大的气候特点造成导线张力升高，导致未安装防振装置的导线发生微振，最终悬式绝缘子钢脚在循环弯曲应力的作用下沿着应力集中效应明显的球头与杆部结合部位发生疲劳开裂。
The fracture cause of steel foot of suspension insulator used in 110 kV transmission line is investigated by means of macro-morphology inspection, chemical composition analysis, microstructure inspection, fracture morphology analysis,hardness test and numerical simulation. The results show that the terrain of the area where the transmission line passes through is relatively flat and the wind speed is uniform and stable. At the same time, the climate characteristics of low temperature in winter and large temperature difference between day and night cause the rise of conductor tension, resulting in slight vibration of the conductor without anti vibration device. Finally, under the action of cyclic bending stress, fatigue cracking occurs along the joint between the ball joint and the rod of the steel foot used in suspension insulator.

关键词(KeyWords)： 输电线路;悬式绝缘子;钢脚;疲劳断裂;失效分析
transmission line;suspension insulator;steel foot;fatigue fracture;failure analysis

Abstract:

Keywords:

基金项目(Foundation): 内蒙古电力（集团）有限责任公司科技计划项目“输电铁塔球头连接金具断裂机理及疲劳寿命提升关键技术研究”（2022-08）

作者(Author): 陈浩,田峰,张涛,谢利明,孙云飞
CHEN Hao,TIAN Feng,ZHANG Tao,XIE Liming,SUN Yunfei

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