某110kV变电站接地网问题分析与改造措施  

Analysis on problems of grounding grid of an 110kV substation and modification measures

作　　者：杨匀阳 张春辉 张雨[1] 夏斌[1] 

机构地区：[1]长沙理工大学电气与信息工程学院 [2]长沙信长电力科技有限公司

出　　处：《供用电》2014年第11期57-60,4,共4页Distribution & Utilization

摘　　要：本文根据对某110k V变电站的现场调查结果,对该变电站接地网接地阻抗超标和围墙边缘电位梯度过大,且经过改造之后仍然无法达到要求的问题进行了分析。并结合周围地形、土壤电阻率的实际情况,采用了外延法、降阻剂法和深井接地法以降低接地阻抗,并在变电站围墙四周铺设了立体均压环以改善电位分布。经过计算和试验证明,改造方案达到了预期的效果。For a substation, the ground impedance of the grounding grid could exceed standard and the electric potential gradient at the edge of enclosing walls could be excessively high, even after modification. An analysis on this issue is made in the paper. Based on the actual situation of surrounding to pography and earth resistivity, epitaxial method,drag reduction agent method and deep well grounding method are adopted, and stereoscopic grading rings are laid surrounding the enclosing walls of the substation to improve potential distribution.

关 键 词：110k V变电站 接地网 接地阻抗 立体均压环 土壤电阻率 外延法 降阻剂法 深井接地法 

分 类 号：TM63[电气工程—电力系统及自动化]