Title :
Surface flashovers on metal-oxide varistor blocks
Author :
Darveniza, Mat ; Saha, Tapan K.
Author_Institution :
Queensland Univ., Qld., Australia
Abstract :
Extensive studies have been made of surface flashovers on varistor blocks using multipulse (MP) currents which simulate multiple stroke lightning ground flashes. The MP results are compared with those obtained with single-pulse (SP) currents and with high temporary overvoltages (TOV) at 50 Hz. The blocks used were mostly of 5 kA rating as commonly used in distribution surge arresters. MP can cause flashovers not evident with standard SP tests; they are very dependent on the quality of the dielectric on the surface and are independent of the surrounding gas
Keywords :
arresters; dielectric thin films; flashover; lightning; overvoltage protection; power system protection; surface discharges; varistors; 5 kA; 50 Hz; distribution surge arresters; high temporary overvoltages; lightning ground flash simulation; metal-oxide varistor blocks; multiple stroke lightning ground flashes; multipulse currents; surface dielectric coatings; surface flashovers; Arresters; Dielectrics; Flashover; Impulse testing; Laboratories; Lightning; Power system reliability; Surge protection; Varistors; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on
Conference_Location :
Vasteras
Print_ISBN :
0-7803-4237-2
DOI :
10.1109/ICSD.1998.709311
