风电场35kV集电线路不同防雷方式的对比应用

Comparative application of different lightning protection methods for 35kV collector line in wind farm

风电场35kV集电线路大都在山区,雷电活动强烈,需加强其防雷保护。文章研究风电场35kV集电线路降低接电阻与架设耦合地线、加装避雷器对其耐雷水平的影响并进行对比。结果表明,架设耦合地线时,可以达到接地电阻从30Ω降至5Ω时相同的耐雷水平。当三相安装避雷器时,耐雷水平有显著提升,对比降低接地电阻提升效果更好。这为达到降低接地电阻得到相同线路耐雷水平的防雷方法的具体应用,提供了理论依据和方法指导。

Most of the 35kV collector lines of the wind farm are in the mountainous area,and the lightning activity is strong,so it is necessary to strengthen its lightning protection.In this paper,the influence of reducing the resistance of 35kV collector line in wind farm is compared with that of setting up coupling ground wire and installing arrester on its lightning withstand level.The results show that when the coupling ground wire is erected,the same lightning resistance level can be achieved when the grounding resistance is reduced from 30Ω to 5Ω.When the three-phase arrester is installed,the lightning withstand level is significantly improved,and the effect of reducing the grounding resistance is better.This provides a theoretical basis and method guidance for the specific application of lightning protection methods to reduce the grounding resistance to obtain the same line lightning resistance level.