福建沙溪口水电站110kV开关站接地改造分析

根据对福建沙溪口水电站110kV开关站的现场调查结果，对其接地网所存在的严重腐蚀断裂、接地电阻超标等问题进行了分析。结合周围地形、土壤电阻率的实际情况，通过采用对接地网进行重新设计、铺设外延地网、利用自然接地体、施加降阻剂等措施对其进行彻底改造；并对改造后的接地网进行现场试验。试验结果表明：改造后开关站的接地电阻、跨步电压和设备接触电势均满足目标值的要求，改造基本达到了预期的效果。

Analysis on the Modification of Grounding System for llOkV Switch Station of Sha-xi-kou Hydropower Station in Fujian Province

According to the field investigation results of the 1 lOkV switch station of Sha-xi-kou hydropower station in Fujian province, the problem of its grounding network such as serious corrosion cracking and grounding resist- ance overweight is analysed in this paper. Based on the terrain and soil resistance around, the grounding system is thoroughly transformed using the measures such as redesigning the grounding system, laying epitaxial grounding system, using natural grounding body, using resistance-reducing material. The redesigned grounding system is test- ed. The result shows that the grounding resistance, the step voltage, and the contacting voltage of equipment of the 110kV switch station after transformation totally meet the requirement, and the modification has achieved the de- sired effect.