复杂地形下水电站接地系统及其布置安全性研究  

Research on the Safety of Grounding System of Hydropower Station and Its Arrangement Under Complex Terrain

作　　者：胡宇[1] 毛敏[1] 周宇飞 Hu Yu;Mao Min;Zhou Yufei(Shaanxi Province Institute of Water Resources and Electric Power Investigation and Design,Xi'an 710001,Shaanxi)

机构地区：[1]陕西省水利电力勘测设计研究院,陕西西安710001

出　　处：《陕西水利》2022年第6期154-158,共5页Shaanxi Water Resources

摘　　要：伴随着电力系统容量的迅速扩大,接地系统设计难度也不断增大。陕西某水电站装机容量虽不大,但土壤结构复杂,土壤电阻率高。因此研究其接地电阻和接地网布置安全性具有重大意义。首先通过用等效土壤电阻代替水平多层土壤模型来简化土壤模型,同时加入水块模型提高计算精度;接着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不同因素最后通过计算电站接地网的地电位升、跨步电势、接触电势等相关数据来分析其对人身和设备的影响。经验证,该水电站的接地系统不会危害人身和设备安全。With the rapid expansion of power system capacity, the design difficulty of grounding system is increasing.Although the installed capacity of Shaanxi a hydropower station is small, its terrain is complex and its soil resistivity is high.It is of great significance to study the grounding resistance and the layout safety of the grounding grid. In this paper, the soil model is simplified by replacing the horizontal multi-layer soil model with equivalent soil resistance, and add the water block model to improve the calculation precision. Then the boundary element method and Green function are used to derive the grounding calculation model of the power station, and factors that influence the grounding resistance are simulated and analyzed. Finally, by calculating the ground potential rise, step potential, contact potential and other related data of the power station grounding grid to analyze its impact on people and equipment. It is verified that the grounding system of the hydropower station will not do harm to the safety of the body and equipment.

关 键 词：复杂地形 水电站 等效土壤模型 接地电阻 安全性校验 

分 类 号：TV73[水利工程—水利水电工程]