电网技术Issue(2)：311-315,5.DOI:10.13335/j.1000-3673.pst.2014.02.006
特高压直流瓷绝缘子铁帽加速电腐蚀试验
Accelerated Electrolytic Erosion Test of Metal Cap of DC Porcelain Insulator for UHVDC Transmission Line
摘要
Abstract
At present, the phenomena of electrolytic corrosion of metal caps of V-shaped porcelain insulator strings for±800 kV UHVDC transmission lines widely appear and bring great hidden danger to safe operation of UHVDC transmission lines. A test platform for accelerated electrolytic corrosion of metal caps of V-shaped porcelain insulator strings is constructed, and a test method to simulate the on-site electrolytic corrosion of metal caps by water-dripping is proposed. Test results show that the difference between the parameters of corroded region on metal cap of insulator obtained by the proposed method and those from on-site corrosion situations is less than 10%, so the proposed method is of satisfied equivalence to field conditions. Under long-term liquid environment, serious electrolytic corrosion of metal cap of insulator strings occurs at negative polarity side of the being operated transmission line, and when the lost quantity of electric charge reaches to 8 0000 C, the depth of electrolytic corrosion of metal cap is 12.2 mm; adding protective zinc ring to metal cap of insulator can change both initial point and direction where the electrolytic corrosion occurs, and the zinc ring is the first to be electrolytically corroded, thus the zinc ring can evidently suppress the phenomena of electrolytic corrosion of metal insulator caps.关键词
特高压直流输电/瓷绝缘子/铁帽/电腐蚀/锌环Key words
UHVDC power transmission/porcelain insulator/metal cap/electrolytic corrosion/zinc ring分类
信息技术与安全科学引用本文复制引用
张福增,廖一帆,罗凌,李锐海,王国利,王义宁..特高压直流瓷绝缘子铁帽加速电腐蚀试验[J].电网技术,2014,(2):311-315,5.基金项目
特高压工程技术(昆明、广州)国家工程实验室开放基金资助(NEL201203/NEL201301)。Projects Supported by National Engineering Laboratory for Ultra High Voltage Engineering Technology(Kunming, Guangzhou)(NEL201203/NEL201301) （昆明、广州）
