Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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架空输电线路中的铜铝电化学腐蚀效应分析

来源:电工电气发布时间:2017-08-23 13:23 浏览次数:8
架空输电线路中的铜铝电化学腐蚀效应分析
 
周象贤1,王少华1,刘岩2,姜文东2,李特1,林祖荣3
(1 国网浙江省电力公司电力科学研究院,浙江 杭州 310014;2 国网浙江省电力公司,浙江 杭州 310007;3 国网浙江省电力公司绍兴供电公司,浙江 绍兴 312300)
 
    摘 要:针对一起500 kV 线路导线断线故障,通过对感应电流检测和计算、线夹温升试验、工作接地线材质分析等,确定了该导线断线故障的原因是铜线夹和铝导线长期处于强酸雨区的潮湿环境中构成了电化学腐蚀,最终形成了击穿放电,并导致导线被电弧烧断。提出在酸雨地区优先选用铝合金材质线夹,如果选用铜材质线夹则要经常检查导线表面是否存在腐蚀情况等措施来防止电化学腐蚀导致的故障再次发生。
    关键词:电化学腐蚀;感应电流;接地线;酸雨
    中图分类号:TM726.3     文献标识码:B     文章编号:1007-3175(2017)08-0035-04
 
Analysis of Copper-Aluminum Galvanic Corrosion Effect in Overhead Transmission Lines
 
ZHOU Xiang-xian1, WANG Shao-hua1, LIU Yan2, JIANG Wen-dong2, LI Te1, LIN Zu-rong3
(1 State Grid Zhejiang Electric Power Company Research Institute, Hangzhou 310014, China;
2 State Grid Zhejiang Electric Power Company, Hangzhou 310007, China; 3 State Grid Shaoxing Electric Power Company, Shaoxing 312300, China)
 
    Abstract: In allusion to a case of 500 kV circuit conductor fracture fault, the induction current was measured and calculated, the clamp temperature rise experiments were carried out and the ingredients of the ground wires were analyzed. This paper confirmed that the copper clamp and aluminium conductor in strong acid rain for a long time were the conductor fracture fault causes to form the galvanic corrosion and disruptive discharge, so as to lead to the electric arc burnout of conductors. This paper proposed that in acid rainy area aluminium alloy ingredient clamp could be selected preferentially and if the copper ingredient clamp was chosen, the surface of conductors needed examining frequently to find whether they had galvanic corrosion or not to prevent the malfunction caused by galvanic corrosion.
    Key words: galvanic corrosion; induction current; ground lead; acid rain
 
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