Abstract

This paper describes test results on silicone rubber insulators exposed in a field test station for one year. We have been making the research and development of polymer insulators since 1960. Many field tests have been conducted in various countries. One of the recent field tests in Japan on polymer insulators started in 1995, to investigate their long term reliability and contamination performance. The test station is located 50m apart from sea shore. Applied voltages to the specimen insulators are 30kV AC and - lOOkV DC. De-energized insulators are also exposed in the same station for comparison. Leakage currents of those insulators were measured continuously, and the relationship between the leakage current and the meteorological data and contamination degree was investigated. Leakage currents over lOOmA were measured even on the silicone rubber insulators under strong sea winds. The specimens energized with DC voltage are more contaminated with black material than that energized with AC voltage. But hydrophobicity of those insulators is kept intact and no sign of deterioration is observed.

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