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In recent years, hardware corrosion phenomenon occurred on several HVDC transmission lines in China, such as ±800kV Yunguang and Xiangshang UHVDC transmission lines, ±500kV Xingan, Gaozhao and Tianguang lines. The iron cap corrosion problem occurred on the negative polarity and pin corrosion emerged on the positive polarity of the transmission lines. The corrosion condition of iron cap on negative...
Chusui dc transmission line is the world's first ±800kV transmission line in China. 2011 March, gossans of ceramic insulators on ±800kV Chusui dc transmission line appeared electrochemical corrosion at Qujing region in Yunnan province. The corrosion phenomenon concentrated in V-string insulators on negative polarity side. This article describes the basic electrochemical corrosion situation of ceramic...
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