Flashover mechanism of silicone rubber insulators used for outdoor insulation -- 2

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.473355· OSTI ID:152942

Shah, M; Karady, G G ^[1]; Brown, R L ^[2]

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1. Arizona State Univ., Tempe, AZ (United States)
2. Bonneville Power Administration, Portland, OR (United States)

Flashover mechanisms of silicone rubber used for outdoor insulation is presented and experimentally proven. A hydrophobic surface of silicone rubber wets and accumulates contaminants differently compared to conventional porcelain and glass insulators. This suggests that the flashover mechanism of silicone rubber insulators is different than porcelain and glass. This paper (Part 2) experimentally investigates ohmic heating, electrical field caused interaction between water droplets, generation of conductive regions and filaments, field intensification caused spot discharges and the ultimate flashover of silicone rubber along wetted filaments. These studies have resulted in a new flashover mechanism which provides a better understanding of silicone rubber outdoor insulators and their excellent contamination performance. These results will be used for the development of a better laboratory test procedure to evaluation composite insulators` performance in contaminated conditions.

• OSTI ID: 152942
• Report Number(s): CONF-950103--
• Journal Information: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 4 Vol. 10; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
DIELECTRIC PROPERTIES
ELECTRICAL INSULATORS
FLASHOVER
PERFORMANCE
SILICONES