Ying Liang, Xiaohui Yang, and Yunpeng Liu
voltage level, aging, composite insulator
In this paper, the samples were cut from the composite insulator sheds, which have been running for about 10 years at different operating voltage of 110kV, 220kV and 500kV. The sheds include the high-voltage end sheds, low-voltage end sheds and the middle sheds of the composite insulators. The Fourier transform infrared spectroscopy (FTIR) of the sample was tested and the method of peak area was used to analyze the aging level. The results show that the aging of shed occurs mainly in the outer surface of the shed. The surface analysis of the shed shows that, three insulators of different voltage level have a same law, the aging degree in the composite insulator high-voltage side is most serious, followed by low-voltage side, and the aging degree is weakest in the middle part, and such law is even more obvious as the voltage level increases.
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