Role of the size of particles of alumina trihydrate filler on the life of RTV silicone rubber coating

Journal Article · Sat Apr 01 04:00:00 EST 1995 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.400827· OSTI ID:64441

Deng, H; Hackam, R ^[1]; Cherney, E A ^[2]

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1. Univ. of Windsor, Ontario (Canada). Dept. of Electrical Engineering
2. CSL Silicones Inc., Windsor, Ontario (Canada)

The paper reports on a study of the influence of the size of the particles of Alumina trihydrate (ATH) filler on the life of RTV silicone rubber coating in a salt-fog chamber. The particle sizes examined include 1.0, 4.5, 13, 17 and 75{mu}m. The optimum size to give the lowest leakage current and the longest time to failure of the coating is determined. The particle size affects the roughness of the coating. This is determined by a high resolution surface roughness tester and a scanning electron microscope (SEM) examination. The roughness is enhanced after prolonged test in salt-fog. The leakage current affects the amount of silicone fluid on the surface. The amount of silicone fluid present on the surface after exposure to dry-band arcing in salt-fog is a function of the particle size. Measurements of surface roughness, the amount of silicone fluid on the surface and the leakage current combined with theoretical analysis of the heat conduction lead to identification of the mechanisms by which the size of the ATH particle impart resistance to tracking and erosion.

• OSTI ID: 64441
• Report Number(s): CONF-940702--
• Journal Information: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 2 Vol. 10; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
COMPOSITE MATERIALS
ELECTRICAL INSULATORS
PERFORMANCE TESTING
SILICONES
SURFACE CONTAMINATION
SURFACE PROPERTIES