Abstract
The brittle fracture (BF) surface of a 500 kV composite insulator was analyzed. It was operated for 6 years. Chemical compositions on the field failed BF surface were examined by X-ray fluorescence spectrum and FTIR spectroscopy. Test results showed that the chemical functional groups NO3 -, NO2 -, together with SO4 2-, were formed both on the BF surface of FRP rod and in the rust on end fitting near BF crack. Laboratory simulated BF by stress corrosion under nitric acid or sulfuric acid were all analyzed and compared with the field failed BF surface. Analysis of the field failed insulator reveals that the BF is influenced not only by nitric acid, which may be formed by electrical discharge, but also by sulfuric acid, which may come from acid rain
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