接地极入地电流对杆塔腐蚀及防护研究  

Research on preventing corrosion of electric tower caused by grounding current of DC electrode

作　　者：高理迎[1] 郭贤珊[1] 董晓辉[2] 

机构地区：[1]国家电网公司特高压建设部,北京100031 [2]国网电力科学研究院,武汉430074

出　　处：《中国电力》2009年第12期38-41,共4页Electric Power

摘　　要：当直流接地极址靠近输电走廊时,有直流通过地线在不同等电位面的杆塔之间流动,造成杆塔接地体及基础导体腐蚀。针对锦屏—苏南±800kV特高压直流输电工程送端龙恩接地极址,以距极址最近的二自Ⅱ回500kV交流线路为例,仿真计算了流过各个杆塔的直流电流值,分析了土壤结构、杆塔接地电阻等参数对直流分布的影响,结果表明中层电阻率越大、杆塔接地电阻越小,流过杆塔的直流电流值就越大、腐蚀就越严重,而整条线路由直流引起的腐蚀量并不严重,最后结合分析结果提出几种防护措施。If DC grounding electrode is near to the transmission corridor, DC current will flow through shielding wires and towers in different equipotentional surface, leading to erosion of the tower. Actual parameters of DC grounding electrode and its nearest AC transmission line of an ±800 kV ultra HVDC transmission project under construction is exmplified, The DC current flowing through each tower and its distribution character were studied. Results showed that the erossion quantity would be more with the increase of the resistivity of the middle earth layer and decrease of the grounding resistance of the tower, and the total erosion is not serious.In the end, some protective measurements are given.

关 键 词：接地极 土壤结构 直流分布 腐蚀 

分 类 号：TM862[电气工程—高电压与绝缘技术]