浙南地区10kV配电线路综合防雷措施仿真研究

Simulation Research on Comprehensive Lightning Protection Strategies of 10kV Power Distribution Lines in South Area of Zhejiang

以浙南地区某条10kV配电线路为研究对象,该10kV配电线路全线绝大部分位于山区,土壤电阻率较高,沿线杆塔接地电阻大多未能达到设计要求,由雷击引起的线路跳闸及断线率很高;结合ATP-EMTP和CDEGS软件等计算机仿真与辅助设计技术,从安装线路避雷器、架设耦合地线、降低杆塔接地电阻和采用不平衡绝缘装置等方面对线路防雷效果的影响进行了仿真研究;仿真研究表明:综合使用前3中防雷措施能够明显提升10kV配电线路预防直击雷和感应雷的防雷水平;基于该仿真研究方案对该线路进行了防雷改造工程,改造后尚未发现因雷击而造成的线路故障,防雷效果显著。

This paper focuses on one 10 kV power distribution line in the south area of Zhejiang.Most of this 10 kV power distribution line is located in the mountains,where have soil resistivity.The ground resistance of the towers mostly failed to meet the design requirements,and the overhead power distribution line are in high back flash rate and line disconnection rate.By adopting the computer simulation and aided design techniques such as ATP-EMTP and CDEGS software,the influences of installing line lightning arresters,erecting coupling ground wire,reducing the tower grounding resistance and adopting unbalanced insulation device on the lightning protection level are analyzed from the perspective of simulation studies.The simulation results have shown that combination of the first three kinds of lightning protection strategies could greatly improve the protection level of 10 kV power distribution line against both direct and induced lightning.After this line is reconstructed by the lightning protection strategies based on the above mentioned simulation results,the faults caused by lightning have never occurred so far,which demonstrates the lightning protection effect is remarkable.