Abstract
In this paper, we describe the waveform of the leakage current that flows along the surface of a silicone rubber (SR) specimen exposed to a salt fog. In this study, a plate-shaped SR specimen energized with an ac voltage was set in a fog chamber, and its surface state was observed using a high-speed video camera. Simultaneously, the waveform of the leakage current with elapsed time was measured. In accordance with frequency analysis, it was confirmed that the ratio of the third-harmonic component in the leakage current waveform increased with elapsed time. Information on the frequency characteristics of the leakage current was extracted and correlated with the insulation surface condition. The harmonic component of the leakage current can be considered as a diagnostic index for the electrical characteristics and insulation state of polymer insulators under wet conditions.
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