单档不均匀覆冰下架空线路不平衡张力及形变特性研究  

Characteristics of Unbalanced Tension and Relative Displacement in Overhead Power Lines under Non-Uniform Accreted Ice

作　　者：周文武 张小力 江岳 李小亭 张宇卓 李静波 ZHOU Wenwu;ZHANG Xiaoli;JIANG Yue;LI Xiaoting;ZHANG Yuzhuo;LI Jingbo(Northwest Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Xi’an 710075,Shaanxi,China;Department of Civil Engineering,Xian Jiaotong University,Xi’an 710054,Shaanxi,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]中国电力工程顾问集团西北电力设计院有限公司,陕西西安710075 [2]西安交通大学土木工程系,陕西西安710054 [3]国网经济技术研究院有限公司,北京102209

出　　处：《电网与清洁能源》2021年第9期45-50,共6页Power System and Clean Energy

基　　金：国家电网有限公司科技项目(SGTYHT/18-JS-206);西北电力设计院有限公司科技项目(XB1-DK04-2020)。

摘　　要：基于简支梁理论与"等线长法",研究了单档不均匀覆冰下导线不平衡张力及相对形变随档距、覆冰长度、覆冰厚度、档数、高差、串长及电压等级的变化规律。结果表明,导线的最大相对形变值并非出现在整档覆冰情况,而是随档内覆冰长度的增加,存在极大值,当覆冰厚度较大时更为明显。对比不同档距、冰厚下各电压等级线路脱冰跳跃过程中导地线静态、动态接近距离和地线单档非均匀覆冰下导地线静态接近距离,单档非均匀覆冰间隙将先达到闪络条件,在220 kV及以下线路中尤为明显,因此,该文研究能弥补现行规程规范的不足,指导单档不均匀覆冰下杆塔塔头和荷载的设计,以保障电力系统的安全运行。Based on the constant conductor length and numerical iteration methods,the characteristics of unbalanced tension and relative displacement of conductors with different span lengths,ice lengths,ice thicknesses,span numbers,elevation differences,string lengths and voltage levels under non-uniform accreted ice are analyzed.The results show that a maximum value of the relative displacement of wire can be found with increasing of ice length but does not necessarily appear in the case of icing in the whole span,especially as the ice thickness increases.Compared with static clearance and dynamic clearance under different span lengths,ice thicknesses,and voltage levels,the non-uniform ice clearance will reach the flashover condition first,especially in the low voltage level transmission lines.Therefore,the research in this paper can be used for the design of head clearance and load of transmission towers,which can prevent the occurrence of icing disaster and ensure the safety and reliability of power system operation.

关 键 词：单档不均匀覆冰 不平衡张力 形变 输电线路 

分 类 号：TM726[电气工程—电力系统及自动化]