摘要
介绍了一种采用格林函数计算接地网参数的方法,该方法用镜像法计算自电阻和互电阻,可对任意形状的不规则接地网在均匀土壤条件下注入恒定电流后的电位分布进行计算。用基于该方法开发的变电站接地网地面电位分布计算软件对一个10×10的均匀方格接地网进行了计算,结果表明地网电位分布大致为中间高,向四周逐渐降低,网格金属导体上的地面电位高于网格中心处地面电位。文中某变电站接地网的实际数据计算结果也验证了这一结论,并且还表明在规则网格向不规则网格过渡的边缘地区,跨步电压变化较大,若节点处存在垂直接地极则跨步电压更高。最后把该软件的应用拓展到了圆形接地网的计算,把圆形看成规则的16边形,所得结果接近圆形的接地网电位分布。
An approach to calculate parameters of grounding power grid is introduced by using of Green function,through which self resistance and mutual resistance can be calculated by image method,and potential distribution of any irregular grounding power grids after constant current inputting can also be computed in uniform soil conditions.In addition,a software for calculating the potential distribution of grounding system has been developed and used in a 10×10 uniform grounding power grid caculation.The results show that the potential distribution of grounding power grid is higher in middle,its value decreases gradually,and the potential on metal conductors is higher than that on the grid center.The calculation results of a substation grounding power grid verify above conclusion.It also shows that the step voltage changes greatly in transitional edge region from regular grid to irregular grid,and if there exists vertical grounding nodes,the step voltage will become higher.In the end,the software is applied to circle grounding power grid,in which the circle is taken as a regular 16 polygon,and the calculated results are close to the potential distribution of circle grounding systems.
出处
《现代电力》
2010年第5期30-33,共4页
Modern Electric Power
基金
西华大学智能电气设备重点实验室(XZD0819)
关键词
变电站
接地网
电位分布
接地电阻
格林函数
substation
grounding power grid
potential distribution
grounding resistance
Green function
