高阻地区复杂地形下水电站接地系统及其降阻措施研究

Study on grounding system of hydropower station and measures to reduce resistance in the area of high soil resistivity and complex terrain

首先,通过用等效土壤电阻代替多个土壤块来简化土壤模型,加快仿真计算速度;然后,利用边界元法和格林函数推导电站接地计算模型,并仿真分析影响接地电阻大小的因素;最后,分析不同降阻措施,采取综合利用自然接地体同时有选择性地扩大地网面积的方案来降低接地电阻,从而可以在保证降阻效果的同时尽量节约成本。

Firstly, the soil model is simplified by replacing multiple soil blocks with equivalent soil resistance,and the simulation speed is accelerated. Then, the boundary element method and Green’s function are used to derive the grounding calculation model of a power station, and factors that influence the grounding resistance are simulated and analyzed. In the end, the paper analyzes different measures to reduce the resistance, takes measures to comprehensively utilize the natural grounding body and selectively increase the area of the grounding grid to reduce the grounding resistance, so as to save costs as much as possible while ensuring the effect of the resistance reduction.