深孔压力灌注接地技术在芹山水电站的应用

REDUCE GROUNDING RESISTANCE OF GROUNDING MESH FOR QINSHAN HYDROPOWER STATION BY DEEP-HOLE PRESSURE-POURING EARTHING TECHNOLOGY

近年来, 深孔压力灌注接地技术在改造发电厂、变电站的接地网, 降低接地电阻中得到应用,并取得了一定的成果。大中型水电厂一般建设在高土壤电阻率地区,其接地网的接地电阻较难达到设计要求。文中介绍了对福建省芹山水电厂利用深层较低的土壤电阻率和岩层的孔隙,压力灌注降阻剂,形成立体接地网的经验。该工程的成功,表明了深孔压力灌注接地技术对于降低高土壤电阻率地区接地网的接地电阻是很有效的。

In recent years the deep-hole pressure-pouring earthing technology is applied in the renovation of grounding mesh for power plant and substation and in the reduction of earthing resistance and certain achievements are acquired. Because of the high soil resistivity in the regions where the large and medium sized hydropower plants are built, it is difficult for their grounding meshes to satisfy the requirements from related regulations and codes. To solve this problem in the construction of Qinshan hydropower station in Fujian province the agent for reducing soil resistivity was pressure-poured into the deep soil with resulted lower resistivity and the pore space in the rock formation to form a stereo grounding mesh. This experience shows that it is very effective to apply deep-hole pressure-pouring earthing technique in reducing the grounding resistance of grounding mesh located in the region with high soil resistivity.