500 kV变电站接地网腐蚀分析及防护措施  

Analysis on Corrosion Failure of 500 kV 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,湖南长沙410007 [2]武汉大学,湖南武汉430072

出　　处：《湖南电力》2017年第A02期71-75,共5页Hunan Electric Power

基　　金：国家电网公司科技项目(KG12K16004);国网湖南省电力公司科技项目(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500 kV变电站接地网腐蚀失效情况,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:降阻剂铺设不均匀,造成接地网局部盐浓差腐蚀;土壤中存在硫酸盐还原菌促进接地网腐蚀;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。文中最后给出了接地网的防腐建议。The corrosion condition of the 500 kV substation grounding grid was 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 region. The local corrosion of the grounding grid is caused by these reasons ： the resistance reduces agent laid uniformly,which lead to the salt concentration cell corrosion of grounding grid; the existence of sulfate reduces bacteria in soil promoted the corrosion of grounding gr id; galvanic corrosion of carbon steel/graphite and leakage current facilitates the corrosion of grounding grid. The corresponding protection measures are suggested finally in the paper.

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：TM862[电气工程—高电压与绝缘技术]