Studies of the diffusion of low molecular weight silicone fluids on polluted HV silicone insulators. 1. Use of diffuse reflectance FTIR

Liu, Heping, Cash, Gregory A., Sovar, Robert D. and George, Graeme A. (2006) Studies of the diffusion of low molecular weight silicone fluids on polluted HV silicone insulators. 1. Use of diffuse reflectance FTIR. IEEE Transactions on Dielectrics and Electrical Insulation, 13 4: 877-884. doi:10.1109/TDEI.2006.1667749


Author Liu, Heping
Cash, Gregory A.
Sovar, Robert D.
George, Graeme A.
Title Studies of the diffusion of low molecular weight silicone fluids on polluted HV silicone insulators. 1. Use of diffuse reflectance FTIR
Journal name IEEE Transactions on Dielectrics and Electrical Insulation   Check publisher's open access policy
ISSN 1070-9878
1558-4135
Publication date 2006-08-01
Sub-type Article (original research)
DOI 10.1109/TDEI.2006.1667749
Volume 13
Issue 4
Start page 877
End page 884
Total pages 8
Place of publication Piscataway, NJ, U.S.A.
Publisher IEEE (Institute of Electrical and Electronics Engineers)
Language eng
Subject 030301 Chemical Characterisation of Materials
Formatted abstract
The process of hydrophobic recovery of surface-polluted silicone rubber weather sheds on high voltage (HV) composite insulators was studied by applying an artificial kaolin coating to a sample of clean silicone rubber surface. Quantitative analysis of the kaolin coating into which had diffused low molecular weight silicones (LMWS) was achieved using diffuse reflectance infra red spectroscopy (DRIFT). The results show that: the recovery of hydrophobicity is due to the diffusion of LMWS to the surface from the bulk of the insulator rather than the re-orientation of surface molecules; the LMWS concentration in the contaminant is dependent on its concentration in the bulk of the rubber; and at least 60% of the final surface concentration was reached within 24 hours and a plateau reached in 10-15 days. However, the diffusion rate was not affected by temperature in the range from 30 to 80 °C. The results also show that ageing may facilitate the diffusion process. Analysis of the LMWS concentration in the small amounts of real pollutants on insulators returned from service was also achieved using DRIFT by adding an internal standard. Electrostatic deposition of kaolin on rubber surfaces successfully mimics "real world" processes and is an aid in determining the condition of these materials.
Keyword Silicone rubber insulators
Diffusion
Surface contamination
Diffuse reflectance infra red spectroscopy
Low molecular weight silicone
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
 
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Created: Fri, 30 Jan 2009, 01:27:11 EST by Marianne Steentsma on behalf of School of Chemical Engineering