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Experiments were carried out to study the evolution of creepage discharge for various aged pressboards under ac constant voltages. White mark, impulsive current, UHF signal, acoustic signal and dissolved gases were measured. The results show that creepage discharge in aged pressboard tends to creep more quickly and easily than in unaged pressboard; average number of discharge experienced a rapid growth...
To research the creepage performance of high moisture pressboard, possible high moisture of pressboard in service power transformer has been analyzed, a creepage discharge simulation and test equipment and measurement system have been set up in laboratory, which were consisted of creepage discharge model, test tank, UHF sensor, gas-phase chromatographic instrument and partial discharge detector. Creepage...
To research the diagnosis method based ultra high frequency (UHF) signal and dissolved gases analysis (DGA) in oil of severity degree for oil/pressboard insulation surface discharge, a surface discharge simulation and test equipment and measurement system have been set up in laboratory, which were consisted of surface discharge model, test tank, UHF sensor, gas-phase chromatographic instrument and...
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