【摘要】 杆塔接地体冲击特性的研究大多在单层均匀电阻率的土壤中进行,但杆塔地网的土壤结构往往是多层,二者冲击特性的差异有助于对计算和试验结果的判定;接地极冲击特性模拟试验需在多种电阻率土壤中进行,因此需多次更换试验模型中的土壤,对体积较大的模型全部更换土壤,需耗费大量人力物力.提出了一种只更换电极周围区域土壤的局部换土方案,局部换土后的模型是一种双层结构模型,通过建立模型,对单层和双层土壤模型中的冲击特性进行了仿真研究,得出了双层土壤模型中的冲击特性随上层土壤区域的增大而逼近单层土壤模型中的冲击特性的结论,即做冲击试验时局部换土方案可行,同时还给出了最佳换土方案.更多还原

【Abstract】 The research on the impulse characteristics of grounding electrode is usually proceeded in the soil with single uniform resistivity;but the composition of the tower’s grounding system is always with several layers.It is contributed to the judgment of the computation and experiment result by clarifying the difference of two kinds of the impulse characteristics.The simulation experiments of the grounding electrode’s impulse characteristics need to be proceeded on the soil with different resistivity.The soil in the simulation experiments need to be replaced many times.It will spend plenty of manpower,material resources and time to replace the whole soil in the simulation area with great size.The article presents a scheme of partial replacement of the soil with only changing the soil of peripheral region of the electrode.The simulation area with the scheme of partial replacement of the soil is a pattern with double-layer.The article has a simulation study on the impulse characteristics of single and double-layer’s soil pattern via modeling.The results show that with the increase of the upper layer’s soil area;the impulse characteristics of double-layer’s soil pattern has an approaching relationship to the single soil pattern.It is shown that the scheme of partial replacement of soil when having the impulse experiment is feasible;meanwhile,the optimum replacement of soil scheme is given.更多还原