土壤电阻率对特高压输电线路塔顶电位的影响

Influence of Soil Resistivity on the Potential of Tower Overhead in UHV Transmission Line

摘要: 本文建立了考虑电感效应和火花效应的等效接地体时变模型，搭建了特高压输电线路雷击仿真计算模型，来分析土壤电阻率对雷击特高压杆塔顶端时塔顶电位的影响规律。结果表明：当土壤电阻率较小时，塔顶电位随土壤电阻率增加而增加的速度较大，而当电阻率较大时，塔顶电位升高的比较平缓。应根据土壤电阻率情况做防雷设计。

Abstract: This paper established the equivalent model of the inductance effect and the spark effect of the grounding connector when attacked by lightning current. Meanwhile, the article explored the lightning simulation calculation model of the ultra-high voltage transmission lines, and analyzed the influence between the resistance rate and the tower potential when hit by lightning. The result indicates that: when the resistance rate of the soil is less, the tower potential increases greatly with the increase of the resistance rate; and when the resistance rate of the soil is bigger, it increases gently. So it is necessary to design the lightning protection based on the resistance rate of the soil.