矩形钢筋混凝土接地网地面电位的计算

用矩量法计算埋在二层土壤中含水平钢筋的矩形钢筋混凝土接地网在地面上产生的电位,并绘制地面电位、接触电压、跨步电压的三维分布图。由跨步电压分布图可见,钢筋混凝土接地网的跨步电压可能会产生2个峰值,一个在混凝土内部钢筋地网外部的边角附近;另一个在矩形混凝土外部的边角附近。文中给出的2个钢筋混凝土接地网的例子,跨步电压最大值均发生在混凝土外部的边角附近。对有混凝土的接地网,需同时考虑钢筋地网及混凝土外部附近地面上均可能存在跨步电压峰值,这2处地方应加强安全措施。

Calculation of Ground Potential of Rectangular Concrete Grounding Grid with Horizontal Reinforcing Bar in Two-layer Earth

With the Moment Method,the systematic grounding electric potential of the rectangular concrete grounding grid with the horizontal reinforcing bars in two-layer soil has been calculated and the three-dimensional distribution map of electric potential of ground has been drawn in this paper.The step voltage distribution map shows that the step voltage in the concrete grounding grid with reinforcing bars may produce two peaks,one being inside the concrete grid near the exterior side angle of the grid of reinforcing bars and the other being near the side angle outside the concrete.Two examples of the concrete grounding grid are given to show that the maximum value of the step voltage is produced near the side angle outside the concrete.In a concrete grounding grid,one step voltage peak is produced in a grid of reinforcing bars and the other peak may be produced on the ground surrounding the concrete,thus,measures should be taken for safety reasons in the areas where step voltage peaks are produced.