线路杆塔的放射形接地体防雷特性优化与设计

减小雷击对输电设施造成的损害,降低接地体的冲击接地电阻是现今接地设计的重中之重,其中选择不同的接地体分布形状对杆塔的防雷特性有巨大影响.该文利用CDEGS对于两种放射形接地体进行仿真,对比研究两者的冲击特性,发现低土壤电阻率区域更宜使用标准放射形接地体;高土壤电阻率区域更宜装设人字形接地体.对于两种放射形接地体,进一步...

Optimization and Design of Protection Characteristics for Radial Grounding Conductors of Line Towers

Reducing the damage caused by lightning to transmission facilities and reducing the impact grounding resistance of grounding conductors are of top priority to the grounding design.The selection of different grounding conductor distribution shapes has a great influence on the lightning protection characteristics of towers. This paper simulates two kinds of radial earthing through CDEGS,and compares their impact characteristics. It is found that the standard radial earthing is more suitable for low soil resistivity area,while it is better to install herringbone earthing conductor in areas with high soil resistivity. It further applies "dendritic" short conductor to two kinds of radial grounding conductors,analyzes and compares the resistance reduction effect of the supplementing "dendritic" short conductor,which is found to have better effects with the radial earthing. After the simulation with ATP-EMTP considering the influence of spark effect,it is found that when the conductor material length is the same,the effect of applying two dendritic short conductors on a single grounding conductor is the best. The research results can provide theoretical support and analytical thinking for the selection when designing tower grounding for line towers.