摘要
针对某500kV四档四分裂原型线路建立有限元模型,采用非线性有限元数值模拟方法研究风荷载对输电线路脱冰跳跃高度的影响,考虑脱冰瞬间气动外形及气动力参数的改变引起的风载突变,通过对不同冰厚和不同风速条件下输电导线脱冰动力响应结果的分析,得到了输电导线最大脱冰跳跃高度与脱冰前后静止状态弧垂差之间的函数关系。利用二元回归分析拟合出了输电导线考虑风荷载作用下的最大脱冰跳跃高度简化计算公式,利用该公式可更精确地计算输电线路导线及导地线之间的安全间隙,具有一定工程实用价值。
A finite element model was established for a 500 kV four-gear four-split prototype line,and the effect of wind load on the deicing jump height of the transmission line was studied using a nonlinear finite element numerical simulation method.Considering the sudden change of wind load caused by the change of aerodynamic shape and aerodynamic parameters at the moment of deicing,by analyzing the deicing dynamic response results of the transmission line under different ice thickness and different wind speed conditions,the function relationship between the maximum deicing jump height of the transmission line and the arc sag in the static state before and after deicing was obtained.A simplified calculation formula for the maximum deicing jump height of the transmission line under wind load was fitted using binary regression analysis.The formula could be used to calculate the safety clearance between the conductor and the ground wire of transmission line more accurately,which had a certain engineering practical value.
作者
卞荣
张跃龙
刘伟军
陈科技
楼文娟
BIAN Rong;ZHANG Yuelong;LIU Weijun;CHEN Keji;LOU Wenjuan(State Grid Zhejiang Economy Research Institute,Hangzhou 310008,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《电工技术》
2020年第7期44-47,52,共5页
Electric Engineering
基金
国家自然科学基金重点项目(编号51838012)
国家电网科技项目(编号5211JY17000X)。
关键词
输电线路
脱冰
风荷载
冰跳高度
数值模拟
transmission lines
ice-shedding
wind load
jump height
numerical simulation
