考虑多档导线及绝缘子串影响的覆冰及脱冰输电导线找形分析

Research on Form-finding of Icing and Ice-shedding Transmission Line Considering the Influence of Multi-span and Insulator String

传统的输电导线找形研究主要针对单档导线,对多档输电导线找形的研究很少。以某一耐张段为例,充分考虑各档输电导线及绝缘子串之间的相互影响,在ANSYS中建立了多档输电线体系的整体模型。结合实际线路,给出了输电导线在自重荷载下的初始构型,模拟了导线在各档均匀覆冰及不同档脱冰条件下的形状改变。研究发现,在不同档脱冰条件下,绝缘子串严重偏移,未脱冰导线弧垂明显增加,合理地解释了实际线路出现放电跳闸事故的必然性。该整体模型方法可用于架空导线覆冰及脱冰数值仿真,提前发现因脱冰出现跳闸事故的输电线路段,及时做好应对措施,防范于未然。

Traditional research on form-finding of transmission line is aimed at single-span lines, while little has been done for multi-spans. For this reason, this paper takes a strain section for example. A finite element integral model of the multi-span transmission line is established in ANSYS, fully considering the interplay between each span transmission line and insulator strings. Combined with the actual line, the initial configuration under the self-weight load is presented, and the shape change of the conductor is simulated, under uniform ice-coating of every span and ice-shedding of different spans. The study suggests that the conductor sag increases significantly and the insulator string offsets seriously under the condition of ice-shedding of different spans. And a reasonable explanation for the inevitability of the discharge tripping accident of the actual line is provided accordingly. The integral model method proposed in this paper can be used for numerical simulation of overhead conductors with icing and ice-shedding, in order to identify the tripping transmission lines attributed to ice-shedding, response in time, and prevent troubles in advance.