Abstract
In recent years, abnormal heating phenomenon has occurred in composite insulators in China, which have brought potential trouble to the safe operation of power grid. The abnormal heating of fiber reinforced plastic (FRP) rod is an important reason for the temperature rise of composite insulators. In order to study the mechanism of abnormal heating of the FRP rod of composite insulator, three analysis methods of material including scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) are combined to make a microscopic analysis of abnormal heating phenomenon and sample of mandrel, which find that the abnormal heating mandrel of epoxy resin matrix and glass fiber were all deteriorated and accompanied by the invasion of moisture and the produce of HNO3. The experimental results show that polarization loss, partial discharge and resistance loss caused by deterioration of mandrel are the main reasons for abnormal heating of FRP core of composite insulator.
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