摘要
2011年3月,±800 kV云广直流输电线路检修发现瓷绝缘子出现电化学腐蚀现象。经查发现瓷绝缘子电化学腐蚀主要集中在负极性侧V形串铁帽的下檐。从现场环境、悬挂方式等方面进行分析,认为与外施电压极性相关的电解腐蚀在铁帽的电化学腐蚀过程中起主导作用。模拟试验结果表明,可采用锌丝作为牺牲电极,抑制直流瓷绝缘子铁帽的电化学腐蚀。
In October 2011, the electrochemical corrosion is detected on porcelain insulators in Yunnan-Guangdong -＋ 800 kV UH- VDC transmission lines. By at-site investigation, it appears that the gossans＇electrochemical corrosion occurred mainly around the lip of the V-string insulators on negative polarity side. Through analysis on environmental condition and suspension mode of the insula- tors, the paper considers that the voltage polarity relating electrolytic corrosion is the main type of electrochemical corrsion at the gos- sans. Simulation tests shows that zinc wire can be adopted as sacrificial substitute to restrain the gossans＇ electrochemical corrosion.
出处
《南方电网技术》
2014年第3期42-46,共5页
Southern Power System Technology
关键词
特高压直流
瓷绝缘子
铁帽
电化学腐蚀
抑制措施
锌丝
UHVDC
porcelain insulator
gossans
electrochemical corrosion
restraining measure
zinc wire
