ZHANG Jian-xing1, ZHANG Jin-xiang1, WANG Jian-wei1, et al. Investigate to Bushing Failure on Medium Voltage Side of a 500 kV Transformer[J]. High voltageapparatus, 2008, 44(6): 584-586.
ZHANG Jian-xing1, ZHANG Jin-xiang1, WANG Jian-wei1, et al. Investigate to Bushing Failure on Medium Voltage Side of a 500 kV Transformer[J]. High voltageapparatus, 2008, 44(6): 584-586.DOI:
A bushing fault on middle voltage side of a main 500 kV transformer is introduced.Through disassembly inspection and analysis in factory
it was found that the fold on joint belt due to bend in manufacturing caused a distortion in the electrical field
which finally resulted in break of the belt after long running.Discharge hence happened under high voltage between current-carrying pole and first shield causing an overpro of C2H2 content and an fast increasing tanδ.Some measures
such as strictly controlling the production
strengthening insulation check and tracking chromatogram
are suggested in order to prevent the similar fault.