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二滩水电站装机容量330万kW,建成后是四川电网中的骨干电站。电站地处高峡山谷,基岩由二迭系玄武岩和后期侵入的正长岩以及因侵入活动而形成的蚀变玄武岩等组成。由于这类岩石的电阻率很高,约2000～8000Ω·m,要取得较低的接地电阻十分困难。同时,电站位于雅砻江下游,属于亚热带气候。据气象资料记载,多年平均雷电日达70～80天,为强雷电活动区。在二滩水电站的接地设计中,既要得到较低的接地电阻值,又要保证接地电势、跨步电势满足接地规程要求,是一项困难和重要的工作。现将接地设计设想作一介绍。
Ertan Hydropower Station installed capacity of 3.3 million kW, after the completion of the grid in Sichuan backbone power plant. The power station is located in the high gorge valley. The bedrock is composed of two superimposed basalts and later intruded syenite and altered basalts formed by intrusion activities. Due to the high resistivity of this kind of rock, about 2000 ~ 8000Ω · m, it is very difficult to obtain lower grounding resistance. At the same time, the power station is located in the lower reaches of Yalong River, belonging to a subtropical climate. According to meteorological data records, the average number of years of lightning up to 70 to 80 days, is a strong lightning activity area. In the grounding design of Ertan Hydropower Station, it is a difficult and important task not only to obtain a lower grounding resistance value, but also to ensure the grounding potential and the stride potential meet the requirements of grounding procedures. Now the design of the ground for an introduction.