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Conventional online monitoring techniques used for monitoring the levels of contamination on high voltage insulators, such as leakage current and partial discharge, are not effective in dry conditions since they require the surface of the insulator to be wetted by fog, rain, condensation or snow. In order to address this problem, the authors have formerly reported two new techniques based on microwave...
Build-up of surface contamination on high voltage insulators can lead to an increase in leakage current and partial discharge, which may eventually develop into flashover. Conventional contamination level monitoring systems based on leakage current, partial discharge, infrared and ultraviolet camera are only effective when the contamination layer has been wetted by rain, fog or condensation; under...
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