Abstract
This paper presents results and analysis of different leakage current waveforms on porcelain and polymeric insulator material during the clean and pollution contamination under laboratory conditions. The artificial pollution is a combination kaolin and kieselguhr. The resulting leakage current waveforms recorded with different time lapses after contamination are comparing both in, time and frequency domains. The evaluation of insulator surface condition is compared leakage current behavior with hydrophobic degree (contact angle of water drop) on the insulator surface. The experiment result showed that the ceramics insulator has leakage current of surface too different than polymer insulator in dry clean, wet, and polluted conditions. This in caused by polymer isolation had hydrophobic, meanwhile ceramics isolator has hydrophilic.
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