Abstract：To research the aging effect of pressboard on creepage discharge characteristics various aged pressboards was made up by thermal aging method, creepage discharge process was researched by global-plate and needle-plate electrode, creepage discharge phenomenon was observed, inception voltage, extinction voltage, “white mark” development velocity, enduring time and breakdown channel length were measured, pressboard layer microstructure was analyzed. The results show that creepage discharge inception voltage of aged pressboards are immovable and extinction voltage decrease slightly compared with unaged pressboards; creepage discharge in aged pressboards have higher development velocity and longer breakdown channel; creepage discharge characteristics in pressboards layer direction have remarkable decreasement in aged pressboards caused by the decreasement of compactedness and increasement of cavity amount and volume between cellulose layer.
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2012, Vol. 27 
