Silicone rubber for polymer insulator has an excellent hydrophobicity with recovery properties, resulting in a higher pollution performance. However it is inevitable that even silicone polymer insulators start generating corona discharge with time under humid and polluted conditions. And such a corona discharge cause rubber damage because of acid generation. Since it is assumed that the corona discharge characteristics depend on humidity and pollution conditions, corona discharge tests were conducted on silicone polymer insulators by changing pollution condition and humidity condition. As a result, it was verified that the corona discharge phenomena were affected by humidity and pollution even on silicone polymer insulator, and that contribution of corona rings to suppress the discharge was not large.
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