Title: Insulating board the creepage" white spot" in the process of the research on growth characteristics of
ABSTRACT
As a result of the creepage is most dangerous for insulation fault of power transformer, such as the development, will lead to heavy gas action even transformer tank cracking and other malignant transformer accident, great harm. " White spot" is the insulating board the creepage process important phenomenon of insulating board, the creepage of" white spot " growth characteristics, to establish a experiment platform, including a test transformer, test tank, ball plate electrode, oil circulation system, camera and dissolved gas analyzer, measurement of different degrees of aging board the creepage of" white" and dissolved gas content, statistics of the" white" length, angle and area change rule. The results show that the aging degree, higher board in the board surface creepage later produced bubble clusters were significantly more degree of aging lower board and not aging board more intensive, bubble clusters are also more crude; cardboard high creepage time average of42 to43 minutes, but in the same climb electric time, creepage length increases with aging degree; cardboard final white area is basically the same, but the degree of aging high board the leukoplakia in creepage early growth rate faster than the degree of aging lower paperboard; creepage generated hydrogen yield, with aging degree increases, producing acetylene and total hydrocarbon values by the aging degree of influence.
Key words: the creepage, leukoplakia, dissolved gas in oil
