高电压技术2011，Vol.37Issue(10)：2485-2490,6.
高土壤电阻率地区大型水电站接地系统设计
Safety Design Principle of Grounding System in Large Hydropower Station in the Area of High Soil Resistivity
摘要
Abstract
Generally a large hydropower station is located in the mountain area of high soil resistivity and the grounding grid short-circuit current of the system is very big, so the design of the grounding grid is much difficult than that in the ordinary power stations and substations. According to real situation of Jinping lI hydropower station, we theoretically analyze and simulate the actual voltage imposed on the secondary equipment when grounding fault occurs on the high voltage bus. The results show that the over-voltage imposed on equipment insulation depends on grounding grid potential difference rather than GPR, and if the ground potential is isolated from outside, the design of Jinping II hydropower station＇s grounding grid can be Controlled by the qualification that the grounding grid potential difference between switchyard and factory building is lower than 1.5 kV. Finally the safety design principle of large hydropower station＇s grounding system is proposed which can provide a reference for other projects.关键词
大型水电站/接地系统/高电阻率地区/地电位升（GPR）/网内电位差/设计准则Key words
large hydropower station/grounding system/area of high soil resistivity/ground potectial rise（ GPR）/grounding grid potential difference/design principle分类
信息技术与安全科学引用本文复制引用
谭波,杨建军,文习山,蓝磊,田研,唐炬..高土壤电阻率地区大型水电站接地系统设计[J].高电压技术,2011,37(10):2485-2490,6.基金项目
基金资助项目：国家重点基础研究发展计划（973计划）（2009CB724500）. （）
