Wettability of naturally aged silicone and EPDM composite insulators

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/61.57997· OSTI ID:6801294

Gubanski, S M ^[1]; Vlastos, A E ^[2]

---

1. Royal Inst. of Tech., Stockholm (Sweden)
2. Chalmers Univ. of Tech., Goeteborg (Sweden)

This paper reports the wettability of aged surfaces and of the bulk of naturally aged silicone and EPDM insulator housings and of silicone elastomer insulator coatings studied. The samples were taken either directly from the insulators or treated by exposing them to corona discharges and/or to saline pollution. The results show that the contact angles of the silicone rubber insulator surfaces are larger than the contact angles of the RTV silicone rubber coating and of the EPDM rubber insulator surfaces, especially when the surfaces are aged. When the insulators were exposed to corona discharges, the contact angles of the silicone rubber insulators are reduced but after the exposure they recover with time. The contact angles of the EPDM rubber insulators, however, after the exposure, continue to reduce. When exposed to artificial saline pollution, the silicone rubber insulators show a limited recovery of their contact angles with time, while, when exposed to corona discharge, they show a recovery of the contact angle after the exposure. The time for recovery is dependent on the exposure time to the corona discharges.

• OSTI ID: 6801294
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA), Vol. 5:3; ISSN 0885-8977
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
COMPOSITE MATERIALS
WETTABILITY
ELECTRICAL INSULATORS
PROTECTIVE COATINGS
SILICONES
CORROSION PROTECTION
ELASTOMERS
RUBBERS
WEATHERING
COATINGS
ELECTRICAL EQUIPMENT
EQUIPMENT
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
POLYMERS
SILOXANES
240300* - Power Transmission Lines & Cables- (1990-)
360604 - Materials- Corrosion
Erosion
& Degradation