变电站接地网参数的计算与分析  

Calculation and Analysis of Substation Grounding Grid Parameters

作　　者：秦大海[1] 戴玉松[1] 徐闻[1] 黄满意 姜聿涵 

机构地区：[1]西华大学电气信息学院,成都610039 [2]国网成都供电公司,成都610041

出　　处：《电气技术》2014年第11期8-12,17,共6页Electrical Engineering

摘　　要：接地网参数计算的方法主要包括两类:经验公式和数值计算。但常规的计算方法只能计算出接地网的工频接地电阻,而要准确的评估接地网的安全与否,接地网的电位分布、电位梯度分布、接触电压、跨步电压等也是必不可少的参数。在此,本文根据恒定电流场理论,应用表面电荷法和边界元法编写的接地网通用计算程序,该程序不仅可以计算出接地网的电阻,还能算出地表电位分布等参数。同时借助数据处理软件绘制得到了电位分布和电位梯度分布的三维表面图、色阶图、灰度图和等高线图。通过220k V变电站接地网为例,验证了该方法的准确性、可行性,能为变电站接地网的安全性评估提供依据。Method of calculation of grounding grid parameters mainly includes two categories： empirical formulas and numerical calculations. However, the conventional method of calculation can only calculate the frequency grounding resistance of grounding grid, and to accurately assess the safety of grounding grid or not, the potential distribution of grounding grid, the potential gradient distribution, contact voltage, step voltage, etc. is also essential parameters. In this paper based on constant current field theory, the application of surface charge method and boundary element method used to prepare the ground Netcom calculation program, which not only can calculate the resistance of the grounding grid, but also calculate the surface potential distribution and other parameters. The same time with the data processing software to draw a three-dimensional surface plot got potential distribution and the potential gradient distribution histogram, grayscale and contour plots. By 220 k V substation grounding grid, for example, to verify the accuracy and feasibility of this approach can provide the basis for the safety assessment of the substation ground grid.

关 键 词：接地网 接地电阻 电位分布 梯度分布 接触电压 跨步电压 安全性 

分 类 号：TM862[电气工程—高电压与绝缘技术]