基于ATP的35kV架空线路耐雷水平研究

针对某矿区35 kV架空线路4号-8号杆塔之间线路易受雷击、杆塔接地电阻值超标的问题,通过对雷电流、架空线以及避雷器进行建模,对杆塔和绝缘子进行选型,确定了架空线阻抗、绝缘子串50％闪络电压、雷电波通道阻抗等参数,运用电磁暂态分析工具ATP对该端架空线路的耐雷水平进行仿真分析,定量分析了未装设避雷器情况下接地电阻改善前后杆塔的耐雷水平,在此基础上对该线路段装设避雷器的组数和安装位置进行仿真分析,结果为在4号-8号杆塔之间的5号和6号杆塔安装两种避雷器能最大程度地提高耐雷水平.

Simulation to Lightning Withstanding Level of 35 kV Overhead Line Based on ATP

The overhead power lines between the 4th tower and the eighth tower of a mining area are easy to suffer lighting strike and the resistance of the towers is hard to reduce. Thus models of lighting current, ground lines and arresters were proposed, and the types of tower and insulator were decidedto solve that problem. The parameters of resistance of the lines, the flash voltage of the insulators and the resistance of the lighting path were all obtained. ATP was applied in lightning withstanding level simulation study between the 4th tower and the eighth tower of 35 kV line in a mining area. Firstly, the lightning withstanding level of between the 4th tower and the eighth tower was simulated without arresters, and then different sets of arresters and different positions of arresters were quantitatively analyzed in this paper. The results showed that two sets of attesters installed at the position of the fifth and the sixth towers could improve the lightning withstanding level at the largest extent.