脱冰方式对架空输电塔-线体系脱冰响应的影响  

Influence of Ice-shedding Pattern on Ice Shedding Responses of A Transmission Tower-Line System

作　　者：张伟[1] 吴新桥 江俊[1] 

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,西安710049 [2]南方电网科学研究院有限责任公司,广州510080

出　　处：《电力学报》2017年第2期108-115,共8页Journal of Electric Power

摘　　要：以实际运行输电线路的一耐张段为研究对象,在塔线体系建模中,提出了通过施加初始应变的找形方法。在输电线路脱冰研究中,通过将数值计算结果与文献中实验结果进行对比,验证脱冰响应求解方法的可靠性。分析了在相同脱冰率下,"全档脱冰"和"集中脱冰"两种脱冰方式对塔线体系脱冰响应的影响。结果表明:无论是从导线脱冰跳跃幅度、张力振荡幅度,还是绝缘子串偏移幅度和张力振荡幅度来比较,集中脱冰方式引起的响应幅值都更大;从输电塔构件轴向应力来比较,两种脱冰方式的影响十分接近,均使得输电塔一些构件处的轴向应力增加,有的位置应力较静态时增加了20%以上,可危及输电线路安全运行。A simple way is proposed to determine the static equilibrium state of the conductor cable under its self-weight load by applying the initial strain on the cable. To study the dynamic response of ice shedding of overhead transmission towerqine system, the simulation method is validated by comparing the numerical results with the experimental ones. Two different ways of ice shedding, one called ＂all-span ice-shedding＂, another called ＂part-span ice-shedding＂, are simulated under the same drop ratio. It is found that the way of ＂part-span ice-shedding＂ lead to a bigger threat to the power networks in terms of conductor jump height, conductor tension oscillation amplitude, insulator displacement and its tension oscillation amplitude. For the axial force of members of tower, the influence of two different ways on ice shedding is very close to each other. The axial force of members of tower may increase over 20 percent at some position after ice shedding, which decreases the safety of transmission tower line system.

关 键 词：塔线体系 脱冰方式 脱冰响应 

分 类 号：TM752[电气工程—电力系统及自动化] TU312[建筑科学—结构工程]