Title :
Performance of high-voltage outdoor insulators embedded with metal oxide varistors
Author :
Nour, H. I Mohamed
Author_Institution :
Dept. of Electr. Eng., California State Univ., Long Beach, CA, USA
Abstract :
The flashover performance of dynamic solid insulators in a polluted environment is presented. A dynamic insulator consists of a metal oxide varistor enclosed by an insulating housing. This insulator assembly is designed to achieve improved performance under both transient and steady state conditions. The mechanism of surface breakdown of these insulators under high voltage stress is analyzed. A general arc propagation model is utilized for evaluating the critical flashover voltage of a simple configuration. The effects of surface contamination and its nonuniformity on the critical flashover voltage are also studied. It is shown that an improvement of 15-40% may be achieved in flashover performance as a result of embedding the insulators with metal oxide varistors
Keywords :
arcs (electric); electric breakdown of solids; environmental degradation; flashover; high-voltage engineering; insulators; surface discharges; varistors; arc propagation model; critical flashover voltage; dynamic solid insulators; flashover performance; high voltage stress; high-voltage outdoor insulators; insulating housing; metal oxide varistors; polluted environment; steady state conditions; surface breakdown; surface contamination; transient conditions; Assembly; Breakdown voltage; Flashover; Insulation; Metal-insulator structures; Pollution; Solids; Steady-state; Surface contamination; Varistors;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1992., Proceedings of the 4th International Conference on
Conference_Location :
Sestri Levante
Print_ISBN :
0-7803-0129-3
DOI :
10.1109/ICSD.1992.224997
