500kV架空输电线路覆冰失效有限元仿真分析  

Failure Analysis of 500 kV Iced Overhead Transmission Line by Finite Element Method

作　　者：杜志叶[1] 张宇[2] 阮江军[1] 阮祥勇[3] 甘艳[4] 杜卫[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]江西省电力公司,南昌330077 [3]合肥供电公司,合肥230022 [4]华中电网有限公司,武汉430077

出　　处：《高电压技术》2012年第9期2430-2436,共7页High Voltage Engineering

基　　金：国家自然科学基金(50977066)~~

摘　　要：高压架空输电线路覆冰倒塔是近几年来影响我国电力系统安全稳定运行的重要因素之一。基于有限元法(FEM)分析软件ANSYS,考虑杆塔和导、地线之间的铰接耦合作用,研究了塔-线体系的力学数值分析模型的建模方法。针对具体线路覆冰微气候区,建立了2个耐张段的塔-线系统整体仿真模型,分析了不同覆冰厚度、风向以及风速作用下,塔线系统的失效情况。针对杆塔结构薄弱点,提出了相应的改造措施,并通过数值仿真进行了校核。数值分析结果同线路实际运行情况相符,可用于架空输电线路覆冰可靠性分析和线路改造措施效果评估。Heavy iced transmission line is one of the important factors threatening the safety and stability of China＇s power system. Difficulties of coupling between the tower and conductors and iced load handling make it difficult for the traditional calculation method to establish an accurate model to accurately calculate the unbalanced tension of tower-line system. Consequently, we used the beam element and cable element to establish an finite element method （FEM） simulation model of tower-line system by the ANSYS software, and analyzed the maximum stress , deformation of the towers-line structure by considering the ice thickness, wind direction, and wind speed parameters, and also analyzed the causes for collapsed towers under the condition of real uneven icing and wind. Moreover, the weakness of the transmission line was pointed out and modification proposals were presented based on simulation analysis. The simulation results of the 500 kV heavy iced overhead transmission line show that the proposed method is credible.

关 键 词：塔-线系统 覆冰 有限元法(FEM) 初始应变 不平衡张力 应力 

分 类 号：TM75[电气工程—电力系统及自动化]