Photos: INMR ©
Test line at Gochang in Korea where 765 kV insulators are being continuously monitored and compared in a coastal environment.
According to Narain, at the time many local lines were still insulated with glass and it was only these that experienced flashovers. Moreover, some substation porcelain with as much as 31 mm / kV specific creepage also flashed over.“ Because this problem was absent on lines insulated with polymers,” he reports,“ we decided to carry out a massive project where nearly a dozen of our 400 kV lines were re-insulated with silicone rubber in place of glass. Hopefully, by 2014 / 2015, we will see if this has solved cyclical pollution flashover problems due to bush fires.”
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