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Faster and severer erosions were found on HTV (high temperature vulcanized) silicone rubber polymer insulators compared with RTV (room temperature vulcanized) silicone rubber coated porcelain insulators both by our 275-kV full scale accelerated ageing test and outdoor exposure test in spite of having almost the same leakage distances and being tested under the same test conditions. In order to identify...
Semi-conducting glaze porcelain insulators show better contamination flashover voltages compared with normal porcelain insulators due to surface drying effect by the leakage current flowing in the glaze together with improved voltage distribution even at the dry bands by parallel surface glaze resistance. However, ageing deterioration of semi-conducting glaze is not avoidable. We have conducted accelerated...
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