湖泊岸边红壤土渗流对杆塔接地电阻的影响

为研究湖泊水分渗透对红壤土区的杆塔接地装置电阻的影响,采用有限元法结合试验研究了红壤土电阻率与饱和度的关系及水分渗透过程,在CDEGS中构建接地装置模型,提出水分影响系数的概念,计算渗透存在对湖泊周边杆塔接地装置接地电阻的影响。结果表明,红壤土电阻率对水分十分敏感,渗透会改变土壤饱和度的分布,引起土壤电阻率降低,使接地电阻下降;离湖泊越远,杆塔接地电阻越大,水分影响系数越大,水分影响系数呈缓慢-迅速-缓慢的上升趋势。

Influence of Seepage of Red Soil on Grounding Resistance of Tower on Shore of Lake

In order to study the influence of water seepage on the grounding resistance of tower in red loam region, the relationship between resistivity and saturation of red loam and the process of water seepage were studied by finite element method combined with experiments. The grounding device model was built in the CDEGS, and the concept of water influence coefficient was proposed. The influence of seepage on grounding resistance of tower grounding device around lake was calculated. Resistivity of red loam soil is very sensitive to water content. Seepage will change the distribution of soil saturation so that led to the decrease of soil resistivity and the decrease of grounding resistance. The farther away from the lake and the greater the grounding resistance of pole and tower is, the greater the coefficient of water influence is, and the water influence coefficient shows a slow rapid slow upward trend.