向家坝-上海±800kV特高压直流线路采用牺牲阳极的阴极保护方案探讨  

Research of Cathode Protection Scheme Based on Sacrifice Anode in Xiangjiaba-Shanghai ±800kV UHVDC line

作　　者：张友富[1] 徐勇明[2] 张毅[1] 薛春林[3] 何华林 岳芳 

机构地区：[1]国家电网公司直流建设分公司,北京100052 [2]浙江嘉兴电力局,浙江嘉兴314000 [3]中国电力工程顾问集团华东电力设计院,上海200063 [4]成都桑来特科技股份有限公司,四川成都610045

出　　处：《华中电力》2011年第6期7-10,共4页Central China Electric Power

摘　　要：向家坝-上海特高压直流线路(以下简称向上线路)和皖电东送特高压交流线路平行进入上海后,受走廊条件的制约,线路需从原±500kV宜华线接地极腰泾极址的东侧通过,在±500kV宜华线采用单极大地回路运行时,其3000A入地电流可能会对附近的金属管线包括向上线的接地体及基础中钢筋进行腐蚀。根据"高压直流输电大地返回运行系统设计技术规定"[1]中的规定,向上线路需采取有效基础绝缘措施。在综合考虑技术经济因素后,向上线路采用牺牲阳极的阴极保护设计,保护基础中的钢筋和接地装置,目前工程已运行14个月,其9基采用阴极保护措施的基础绝缘效果良好。在电力线路中采用牺牲阳极的阴极保护设计方案,其研究结果可为后续输电线路工程基础绝缘提供设计依据。Xiangjiaba-Shanghai UHVDC line is parralled into Shanghai with the other UHVDC line for sending Anhui electricity to East China. Limited by the line corridor, Xiang-Shang line is passing by the east of ±500kV Yihua line＇s Yaojing grounding pole location. When Yihua line is running at single-pole earth loop mode, its 3000 Ampere current into earth would affect the nearby metal pipes including Xiang-Shang line＇s grounding body and steel bar in the base. According to ＂HVDC transmission line design technology specification for earth loop mode＂ statement, Xiang-Shang line must adopt effective base insulation. After comprehensive consideration of the technical and economic factors, cathode protection based on sacrifice anode is a reasonable solution. By now Xiang-Shang line has operated 14 months, and the 9 bases with the above method have good insulation effect. The result can provide design basis for the following transmission line engineering base insulation.

关 键 词：特高压直流输电 牺牲阳极 阴极保护 绝缘 方案 

分 类 号：TM721.1[电气工程—电力系统及自动化]