In order to analyze the dominant cause of porcelain post insulator abnormal local fevering, in the experimental laboratory, 20kV power frequency voltage was applied to the test sample which had apparent local heating phenomenon in the untreated, dried and soaked t states, time-varying infrared thermal image and leakage current was recorded. It is found that the main cause of the test object exception generating is that water molecules penetrated through the cracks into the ceramic body, the molecules were p...
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