动态风载荷下交叉跨越线路连接金具受力特性  

Analysis of Force Characteristics of Typical Connecting Metals of Cross-over Lines

作　　者：庞锴 卢明 田瑞 薛博 PANG Kai;LU Ming;TIAN Rui;XUE Bo(State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450052 [2]华北电力大学机械工程系,保定071003

出　　处：《科学技术与工程》2020年第19期7798-7803,共6页Science Technology and Engineering

基　　金：国家电网有限公司总部科技项目(52170218000G)。

摘　　要：为提高交叉跨越线路的安全运行水平,以某220 kV交叉跨越线路作为研究对象,利用线性滤波法模拟大风工况和正常工况下的脉动风速时程曲线,对交叉跨越线路有限元模型进行动态分析计算,然后重点对金具的受力状态进行对比分析,找到易损位置,并提出相应的改进措施。结果表明:悬垂串球头挂环连接处受到的应力最大;两种工况下应力与许用应力的比值分别为0.35和0.44,和现场实测断裂位置吻合,需要重点注意;在球头和直棒连接处加厚,安全系数由1.5提高到1.6,可有效降低金具破坏风险。In order to improve the safety operation level of the cross-over line, a 220 kV cross-over line was taken as the research object. The linear filtering method was used to simulate the pulsating wind speed time history curve under high wind conditions and normal conditions. After dynamic analysis and calculation, the stress state of the fittings was compared and analyzed, the vulnerable position was found, and the corresponding improvement measures were proposed. The results show that the stress at the joint of the hanging string ball head is the largest;the ratio of the stress to the allowable stress is 0.35 and 0.44 under the two working conditions, which is consistent with the actual fracture position measured on site and needs to be paid attention to;the ball head and straight The connection of the rod is thickened, the safety factor is increased from 1.5 to 1.6, and the risk of damage to the hardware is effectively reduced.

关 键 词：交叉跨越线路 线性滤波法 动态分析 金具的受力状态 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]