500kV变电站接地网腐蚀分析及防护措施
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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 500kV substation grounding grid is investigated by theanalysis live photograph,scanning electron microscopy(SEM),electron diffraction spectra(EDS)andX-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 laiduniformly,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 carbonsteel/graphite and leakage current facilitated the corrosion of grounding grid. The corresponding protec-tion measures are suggested finally.
The corrosion condition of the 500kV substation grounding grid is investigated by theanalysis live photograph,scanning electron microscopy(SEM),electron diffraction spectra(EDS)andX-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 laiduniformly,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 carbonsteel/graphite and leakage current facilitated the corrosion of grounding grid. The corresponding protec-tion measures are suggested finally.
引文
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[16]徐松,冯兵,何铁祥.4种涂层钢在变电站土壤中的腐蚀行为研究[J].湖南电力,2015,36(4):36-40.XU Song,FENG Bing,HE Tiexiang.Investigation of corrosion property of four kinds of coating in the transformer substation soil[J].Hunan Electric Power,2015,36(4):36-40.
[17]章小鸽,邢安庆,徐乃欣.镀锌钢的电偶作用——基本理论和实际应用[J].腐蚀与防护,2007,28(3):143-146.ZHANG Xiaoge,XING Anqing,XU Naixin.Galvanic action of Zinc coated steel[J].Corrosion and Protection,2007,28(3):143-146.
[2]朱志平,马骁,荆玲玲,等.变电站土壤腐蚀性评价及接地网金属腐蚀特性分析[J].电瓷避雷器,2009(4):18-22.ZHU Zhiping,MA Xiao,JING Lingling,et al.Soil corrosion evaluation of substation and metal corrosion characteristics analysis for grounding grid[J].Insulators and Surge Arresters,2009(4):18-22.
[3]万欣,李景禄.接地装置的腐蚀及防腐蚀措施的研究[J].电瓷避雷器,2006(4):37-40.WAN Xin,LI Jinglu.Study on corrosion of grounding device and anticorrosion measures[J].Insulators and Surge Arresters,2006(4):37-40.
[4]陈坤汉,杨道武,朱志平,等.接地网在土壤中的腐蚀特性研究[J].电瓷避雷器,2008(4):39-42.CHEN Kunhan,YANG Daowu,ZHU Zhiping,et al.Corrosion characteristic of grounding grid in soil[J].Insulators and Surge Arresters,2008(4):39-42.
[5]何金良,曾嵘.电力系统接地技术[M].北京:科学出版社,2007.
[6]彭向阳,王锐,毛先胤,等.输电线路架空地线电能损耗特性测量及仿真[J].广东电力,2016,29(3):120-126.PENG Xiangyang,WANG Rui,MAO Xianyin,et al.Measurement and Simulation on Electric Power Loss Characteristic of Overhead Ground Wires of Power Transmission Lines[J].Guangdong Electric Power,2016,29(3):120-126.
[7]周佩朋,王森,李志忠,等.耐蚀性金属接地材料研究综述[J].电力建设,2010,31(8):50-54.ZHOU Peipeng,WANG Sen,LI Zhizhong,et al.Reviewof corrosion resistant metals for grounding[J].Electric Power Construction,2010,31(8):50-54.
[8]PAPAVINASAM S,ATARD M,ARSENAL B,et al.State of the art of thermal spray coatings for corrosion protection[J].Corrosion Reviews,2008(26):105-146.
[9]WENG D,JOKIEL P,UEBLEIS A,et al.Corrosion and protection characteristics of Zinc and Manganese phosphate coatings[J].Surface&Coatings Technology,1997,88(1/3):147-156.
[10]银耀德.全国土壤腐蚀试验网站资料选编,第二集[M].上海:上海交通大学出版社,1992.
[11]魏巍,吴欣强,柯伟,等.接地网材料腐蚀与防护研究现状与进展[J].腐蚀科学与防护技术,2015(27):273-277.WEI Wei,WU Xinqiang,KE Wei,et al.A review of the investigation of corrosion and protection for grounding materials[J].Corrosion Science and Protection Technology,2015(27):273-277.
[12]WU Xinqiang,XU Jian,KE Wei,et al.Effects of p H value on corrosion behavior of Thermal-Sprayed Al-Si coated Q235 steel in simulated Soil solutions[J].Journal of Materials Engineering and Performance,2014,23(6):2265-2273.
[13]WEI Wei,WU Xinqiang,KE Wei,et al.Electrochemical corrosion behavior of Thermal-Sprayed stainless SteelCoated 0235 steel in simulated Soil solutions[J].Journal of Materials Engineering and Performance,2016,25(2):518-529.
[14]徐松,冯兵,何铁祥,等.几种合金涂层在变电站土壤中的腐蚀行为研究[J].装备环境工程,2015(4):54-59.XU Song,FENG Bing,HE Tiexiang,et al.Investigation of corrosion behaviors of different alloy coatings in the Soil of transformer substation[J].Equipment Environmental Engineering,2015(4):54-59.
[15]QIN Yi,SONG Xu,LI Xuzhi,et al.Corrosion characteristics of grounding grid in resistance-reducing agents[J].Advanced Materials Research,2014(888):947-950.
[16]徐松,冯兵,何铁祥.4种涂层钢在变电站土壤中的腐蚀行为研究[J].湖南电力,2015,36(4):36-40.XU Song,FENG Bing,HE Tiexiang.Investigation of corrosion property of four kinds of coating in the transformer substation soil[J].Hunan Electric Power,2015,36(4):36-40.
[17]章小鸽,邢安庆,徐乃欣.镀锌钢的电偶作用——基本理论和实际应用[J].腐蚀与防护,2007,28(3):143-146.ZHANG Xiaoge,XING Anqing,XU Naixin.Galvanic action of Zinc coated steel[J].Corrosion and Protection,2007,28(3):143-146.