Avaliação da Criticidade do Campo Elétrico em Isoladores de Vidro

This paper presents an evaluation of the electric field criticality and potential distribution in a chain 69 kV glass insulators. The analysis was performed under different operating conditions: insulators with cement reduction, sacrificial ring, bell touching pollution effect. For this, multhiphysics simulation software used. As results, it noted that reduction ring presence intensified fields values close to pin first insulator by more than 40%, which could cause flashovers, increase corrosion rate puncture glass, unlike pollution, didn´t significant changes field. On other hand, along shed remained standardized, exception cases resulted at all points skirt.