冰冻土壤中垂直接地极的接地电阻变化规律
发布时间：2019-06-10 09:25
【摘要】：单根垂直接地极在均匀土壤冰冻前后工频接地电阻值的变化会影响防雷接地检测的误差和防雷接地的效果。鉴于此,利用CDEGS软件对单根垂直接地极在均匀土壤产生冻土前、后的接地电阻值R1、R2进行了仿真。分析仿真数据得出:影响该接地电阻值的主要因素有反射系数、冻土厚度和垂直接地极的长度;当垂直接地极在冻土层时,R1与R2之间满足线性变化的关系式;当垂直接地极穿过冻土层时,R1与R2之间满足非线性变化的关系式;与CDEGS的仿真值相比,垂直接地极在冻土层时,采用提出的拟合公式得到接地电阻的相对误差在±5%左右;垂直接地极穿过冻土层时,采用提出的拟合公式得到接地电阻相对误差绝对值在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 卤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，
本文编号：2496362
[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 卤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，
本文编号：2496362
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2496362.html
教材专著
