输电线路架空导线雷击断线断股试验研究

Experimental Study on Lightning-Induced Strand Breakage of Overhead Conductors of Transmission Lines

文中针对输电线路架空导线的雷电流烧蚀特性设计试验,选取较有代表性的且常用的JL/G1A-240/30、JL/G1A-300/25这两种型号导线作为实验样品,对这几种样品分别进行电荷量为50 C、100 C、150 C、200 C的雷电流模拟雷击试验,试验发现两种规格的架空输电线路导线都表现出良好的耐雷电流烧蚀能力,100C及以下雷电流作用下,2种规格导线都不会出现断线断股现象,最大200 C雷电流作用下,JL/G1A-300/25导线平均出现2股断线断股现象,JL/G1A-240/30导线没有出现断股现象,相比而言JL/G1A-240/30导线耐雷性能更好。输电线路烧蚀特性与钢芯铝绞线的单根铝绞线直径密切相关,单根铝绞线直径越大,导线越不容易发生断股现象。

According to the design test of lightning current ablation characteristics of overhead conductors of transmission lines,two typical and commonly used types of conductors,JL/G1 A-240/30 and JL/G1 A-300/25,were selected as experimental samples.Lightning current simulation tests with charge of 50 C,100 C,150 C and 200 C were carried out for these samples respectively.It was found that the conductors of two types of overhead transmission lines had good lightning current ablation resistance.Under the action of lightning current of 100 C and below,no strand breakage would occur in the conductors of two specifications.Under the action of maximum200 C lightning current,two strands of JL/G1 A-300/25 conductors were broken on average,while no strand breakage occurs in JL/G1 A-240/30 conductors.Compared with JL/G1 A-240/30 conductors,the lightning resistance of JL/G1 A-240/30 conductors was better.The ablation characteristics of transmission lines are closely related to the diameter of single aluminium strand of steel-cored aluminium strand.The larger the diameter of single aluminium strand,the less likely the strand breakage will occur.