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000000432 037__ $$aENY-ARTICLE-2013-345
000000432 041__ $$aeng
000000432 100__ $$aChrzan, K L$$uWroclaw University of Technology
000000432 245__ $$aDegradation and destruction of ZnO varistors caused by current pulses
000000432 260__ $$c2012-11-02
000000432 300__ $$a4p
000000432 500__ $$aInternational Conference on Advances in Processing,Testing and Application of Dielectric Materials APTADM, Wroclaw 2001, paper 55
000000432 520__ $$aAlthough the modern metal oxide elements are resistant to degradation caused by continuous operating voltage the degradation or destruction caused by current impulses, especially lightning currents, is still a serious problem. This phenomenon was the subject of the current study where single zinc oxide elements and 6 kV arresters manufactured in Poland were tested with 8/20 ms impulse currents. During our investigation the temperature and changes in current-voltage characteristics were recorded. These results indicate that even varistors that were stressed with high currents could reach  saturation state in which following impulses did not cause any further degradation. Both single varistor elements and 6 kV arresters showed only little ageing if stressed with 0,5 kA impulses. The 6 kV arresters composed of 10 elements were able to withstand smaller currents than single varistors. Our findings suggest that a combination of sparking effects and less than optimal contacts are the cause varistor degradation.
000000432 6531_ $$apuncture
000000432 6531_ $$asurface flashover
000000432 700__ $$aWroblewski, Z.$$uWroclaw University of Technology
000000432 8560_ $$
000000432 8564_ $$u$$zAccess to Fulltext
000000432 909CO $$$$pglobal
000000432 980__ $$aARTICLE