【摘要】：單根垂直接地極在均勻土壤冰凍前后工頻接地電阻值的變化會影響防雷接地檢測的誤差和防雷接地的效果。鑒于此,利用CDEGS軟件對單根垂直接地極在均勻土壤產(chǎn)生凍土前、后的接地電阻值R1、R2進行了仿真。分析仿真數(shù)據(jù)得出:影響該接地電阻值的主要因素有反射系數(shù)、凍土厚度和垂直接地極的長度;當垂直接地極在凍土層時,R1與R2之間滿足線性變化的關系式;當垂直接地極穿過凍土層時,R1與R2之間滿足非線性變化的關系式;與CDEGS的仿真值相比,垂直接地極在凍土層時,采用提出的擬合公式得到接地電阻的相對誤差在±5%左右;垂直接地極穿過凍土層時,采用提出的擬合公式得到接地電阻相對誤差絕對值在5%~10%左右。
[Abstract]:The change of power frequency grounding resistance of single vertical pole before and after freezing in uniform soil will affect the error of lightning protection grounding detection and the effect of lightning protection grounding. In view of this, the grounding resistance R _ 1 and R _ 2 of a single vertical pole before and after the formation of frozen soil in uniform soil are simulated by using CDEGS software. The simulation data show that the main factors affecting the grounding resistance are the reflection coefficient, the thickness of frozen soil and the length of the vertical earth pole, and the linear relationship between R1 and R2 is satisfied when the vertical pole is in the frozen soil layer. When the vertical direct pole passes through the frozen soil layer, the relationship between R1 and R2 satisfies the nonlinear variation, compared with the simulation value of CDEGS, when the vertical pole is in the frozen soil layer, the relative error of grounding resistance is about 鹵5% by using the proposed fitting formula. When the vertical direct pole passes through the frozen soil layer, the absolute value of the relative error of the grounding resistance is obtained by using the proposed fitting formula, which is about 5% 鈮，

本文編號：2496362