500kV变电站接地网腐蚀分析及防护措施  

Corrosion Investigation and Protection Measures for the 500kV Substation Grounding Grid

作　　者：徐松 杨漫兮 刘凯 王凌 查方林 吴俊杰 周舟 袁新民 

机构地区：[1]国网湖南省电力公司电力科学研究院,长沙410007 [2]武汉大学,武汉430072

出　　处：《电瓷避雷器》2017年第6期69-73,80,共6页Insulators and Surge Arresters

基　　金：国家电网公司总部科技项目(编号:KG12K16004);国网湖南省电力公司科技项目(编号:5116AA110005)

摘　　要：采用现场照片、扫描电子显微镜(SEM)、电子能谱(EDS)和X射线衍射(XRD)分析了某500kV变电站接地网腐蚀情况,探讨了腐蚀机理,结果表明:地网腐蚀为局部腐蚀,主要原因为1)降阻剂铺设不均匀,造成接地网局部盐浓差腐蚀;2)土壤中存在硫酸盐还原菌促进接地网腐蚀;3)石墨与扁钢之间存在电偶腐蚀,泄漏电流促进了接地网局部腐蚀。并提出了接地网的防腐措施。The corrosion condition of the 500 kV substation grounding grid is investigated by the analysis live photograph, scanning electron microscopy （SEM）, electron diffraction spectra （EDS） and X-ray diffraction （XRD）. The result shows that the most severely corrosion is appeared on the local re- gion. The local corrosion of the grounding grid, the main reason is, 1 ） the resistance reducing agent laid uniformly, which lead to the salt concentration cell corrosion of grounding grid; 2） the existence of sul- fate reducing bacteria in soil promoted the corrosion of grounding grid; 3） galvanic corrosion of carbon steel/graphite and leakage current facilitated the corrosion of grounding grid. The corresponding protec- tion measures are suggested finally.

关 键 词：关键词:接地网腐蚀 降阻剂 电偶腐蚀 硫酸盐还原菌 防腐措施 

分 类 号：TM63[电气工程—电力系统及自动化]