Abstract
According to the long-term exposure test in
field, no significant difference in equivalent salt deposit
density was observed between composite and porcelain
insulators. Leakage currents of silicone rubber insulators
were smaller and less frequent compared with porcelain
insulators, while those of ethylene vinyl acetate insulators
were almost comparable to porcelain insulators.
A novel artificial pollution method of hydrophobic
insulators, well simulating natural pollution conditions in
field, has been developed.
Based on this pollution method, fundamental withstand
voltage characteristics have been investigated by the clean
fog method and typical investigation results are presented
in the paper.
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