Electrical performance of RTV silicone rubber coating of different thicknesses on porcelain

Journal Article · Tue Apr 01 04:00:00 EST 1997 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.584405· OSTI ID:492202

Deng, H; Hackam, R ^[1]

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1. Univ. of Windsor, Ontario (Canada). Dept. of Electrical Engineering

A study of the effects of coating thickness of room temperature vulcanizing (RTV) silicone rubber on its electrical performance in salt-fog of 250 {micro}S/cm and 1,000 {micro}S/cm at 0.5 kV{sub rms}/cm is presented. Porcelain rods coated with RTV silicone rubber to a thickness from 0.17 to 0.99 mm were studied. The dependence of current pulse rate and cumulative number of current pulses on coating thickness were determined as a function of time of exposure to combined electric stress and salt-fog. The surface roughness and the total content of low molecular weight (LMW) silicone fluid in the coating were measured before and after the salt-fog test as a function of coating thickness. The effects of heating the RTV in an electric oven on the production and loss of LMW silicone fluid were investigated in order to elucidate the influence of the heat generated by dry band discharges. The loss of weight of RTV at high temperatures (370 C) due to the decomposition of the alumina trihydrate filler into alumina and water was measured and found to be close to the theoretical value.

• OSTI ID: 492202
• Report Number(s): CONF-960725--
• Journal Information: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 2 Vol. 12; ISSN ITPDE5; ISSN 0885-8977
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
DIELECTRIC MATERIALS
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
FOG
PERFORMANCE TESTING
SALTS
SILICONES