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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...
Microwave radiometry is a novel method for monitoring contamination levels on high voltage insulators. The microwave radiometer described measures energy emitted from the contamination layer and could provide a safe, reliable, contactless monitoring method that is effective under dry conditions. The design of the system has focused on optimizing accuracy, stability and sensitivity using a relatively...
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