Title :
Analysis of the acid sources of a field brittle fractured composite insulator
Author :
Liang, Xidong ; Dai, Jianjun
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing
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
Keywords :
Fourier transform spectroscopy; X-ray fluorescence analysis; air pollution; brittle fracture; composite insulators; discharges (electric); infrared spectroscopy; insulator testing; stress corrosion cracking; 500 kV; FRP rod; FTIR spectroscopy; X-ray fluorescence spectrum; acid rain; acid source analysis; brittle fracture crack; chemical composition; composite insulator; electrical discharge; nitric acid; stress corrosion; sulfuric acid; Chemicals; Failure analysis; Fiber reinforced plastics; Fluorescence; Insulation; Laboratories; Spectroscopy; Surface cracks; Surface fitting; Testing;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2006.1667748
