1991 Volume 111 Issue 11 Pages 1208-1214
The Hokkaido-Honshu DC transmission line, the first DC transmission line in Japan, has been successfully operated for the past 11 years since its operation started in December, 1979 with 125kV and its operating voltage was increased to 250kV in June, 1980. This DC line, which interconnects the Hokkaido and Mainland of Japan, is located at a distance ranging from 0.5km to 12km from the seacoast.
Under such circumstances, the authors have been concerned about insulator contamination flashover and the corrosion of hardware, especially pin, due to the electrolysis.
Thus a series of periodical ESDD measurements and investigation of the insulator hardware corrosion have been conducted.
The investigation results show that the original design ESDD values are adequate and the effectiveness of zinc sleeve against the electrolytic corrosion of pin has been clarified. Reduction in weight of zinc sleeve is not only due to the electrolysis but also due to the natural corrosion in the corrosive atmosphere near the seacoast.
The transactions of the Institute of Electrical Engineers of Japan.B
The Journal of the Institute of Electrical Engineers of Japan
