摘要
直流输电线路绝缘子通过安装锌环以减少金具的腐蚀,保障线路的运行安全。为了研究锌环寿命的影响因素,本文搭建了绝缘子直流腐蚀实验平台,研究了绝缘子处于不同悬挂角度时,其保护锌环的腐蚀特征及影响因素。发现锌环的腐蚀面积随着绝缘子悬挂倾角的增大而减少,腐蚀深度随着倾角的增加而增大,而腐蚀生成物将加速锌环的腐蚀;绝缘子悬挂倾角增大后,锌环与绝缘子表面存水区域减少,腐蚀电流更加集中是造成该现象的主要原因。同时水流方向和锌环腐蚀生成物堆积更集中,改变了绝缘子表面电场分布,使该区域的电流密度增大,加剧该区域锌环的腐蚀,甚至造成锌环与绝缘子铁帽之间的放电。研究认为,当绝缘子处于大倾角悬挂时,可以增加最低点锌环厚度以提高其使用寿命。该研究成果可为直流输电线路绝缘子金具腐蚀防治提供参考。
The DC transmission line insulators reduce the corrosion of the fittings by installing zinc rings to ensure the safe operation of the lines. In order to study the factors influencing the zinc ring life,an insulator DC corrosion test platform was set up to study the corrosion characteristics and influencing factors of the zinc ring when the insulator at different suspension angles. The corrosion area of the zinc ring was found to decrease with the increase of the dip angle of inclination of the insulator. The depth of corrosion increases with the increase of the angle of inclination,and the corrosion products will accelerate the corrosion of the zinc ring. It is put forward that the increase of the angle of inclination of the insulator reduces the area of storing water between the surface of the zinc ring and the insulator,and the more concentrated corrosion current is the main reason for this phenomenon. At the same time,the zinc corrosion product deposits in the water flow direction are more concentrated,which changes the electric field distribution on the surface of the insulator,increases the current density in the area,intensifies the corrosion of the zinc ring in the area,and even causes the discharge between the zinc ring and the insulator cap. It is proposed that when the insulator is suspended at a large angle,the thickness of the lowest point of zinc ring can be increased to increase its service life. The research results can provide reference for the prevention of the corrosion of the insulators metal fittings of HVDC transmission lines.
作者
朱军
陈友
唐平
曹晓斌
曾奕
毛强
ZHU Jun;CHEN You;TANG Ping;CAO Xiaobin;ZENG Yi;MAO Qiang(Sichuan Electric Power Research Institute,Chengdu 610072,China;Electric Engineering School of Southwest Jiaotong University,Chengdu 610031,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第1期174-179,共6页
Insulators and Surge Arresters
基金
国网四川省电力公司科技项目(编号:521997160025).
关键词
直流输电线路
绝缘子
腐蚀
锌环
铁帽
DC transmission line
insulator
corrosion
zinc ring
insulator cap
