Bailianya power station is located in mountainous areas, its surroundings are the rock distribution, which proposes higher demanding on lightning protection level for the station with a large number of electronic equipments, according to specifications, co-grounding resistance of grounding system should be less than 1Ω, while the use of angle iron and other conventional materials can not meet requirements of earth electrodes, but if the compound grounding system described in this paper is adopt, it can easily meet the requirements.%白莲崖电站位于山区,其周围环境均为岩石分布,对于有大量电子设备的电站,其防雷水平要求很高,根据规范要求采用合设接地系统的接地电阻应小于1Ω.而使用角钢等常规材料做接地极的很难满足要求,若采用本文叙述的复合接地单元组成接地系统,就能很容易远到要求.
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