FE_Nano_silon_insu - IEEE Transactions on Dielectrics and...

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IEEE Transactions on Dielectrics and Electrical Insulation Vol. 17, No. 2; April 2010 1070-9878/10/$25.00 © 2010 IEEE 597 Analysis of Temperature Profiles and Protective Mechanism against Dry-band Arcing in Silicone Rubber Nanocomposites Isaias Ramirez 1 , 2 , Shesha Jayaram 1 , Edward A. Cherney 1 1 Department of Electrical and Computer Engineering University of Waterloo, 200 University Ave. West Waterloo, Ontario, N2L 3G1, Canada 2 Instituto de Investigaciones Eléctricas Reforma 113, Col Palmira Cuernavaca, Morelos, 62490, México ABSTRACT The paper discusses the mechanism by which nanofillers improve the erosion resistance of silicone rubber nanocomposites under simulated conditions of dry band arcing. Various micro-nano composites are studied, including microfiller, nanofiller, combinations of both, and with a commercial surfactant to improve the dispersion of the nanofiller. The thermal conductivity of the composites, measured using a standard method, shows higher thermal conductivity when the nanofiller is well dispersed. A thermal model is developed and solved with finite element method (FEM) to examine the temperature profile in the modelled nanocomposites under laser heating, which simulates the hot spot from dry band arcing. The hot spot is compared to the measured temperature profile by an infrared camera. SEM, EDAX, and XRD techniques are used to analyze the thermally decomposed silicone residue after laser heating to elucidate the protective mechanism in the silicone rubber nanocomposites. Index Terms Surfactant, Triton TM , nanofiller, microfiller, erosion resistance, thermal conductivity, silicone rubber, outdoor insulation. 1 INTRODUCTION THE addition of micron-sized fillers to silicone elastomers has been well investigated, and it has been shown that micron size fillers improve the thermal conductivity (TC) of the resulting composites, thereby increasing the resistance to erosion due to dry band arcing [1]. Meyer et al [2] demonstrated a good correlation between the thermal conductivity of the composites and their resistance to erosion by dry band arcing in an inclined plane test and by heat ablation with infrared laser. In this work, the reinforcement of a silicone rubber matrix was successfully accomplished with a mixture of a type of micro silica and nano fumed silica, and with a surfactant to improve the dispersion of the nanofiller. Standard test methods of salt fog and inclined plane and a non-standard laser ablation test were used to evaluate the performance of the micro-nano composites. It was previously shown that when nanofillers are well dispersed, the composites show improved resistance to erosion by dry band arcing [3]. Rätzke et al [4] showed a near linear increase of thermal conductivity with nanofiller concentration in silicone elastomers. Although there are theoretical, semi-theoretical, and
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FE_Nano_silon_insu - IEEE Transactions on Dielectrics and...

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