Study of Ageing Deterioration of Silicone Rubber Housing Material for Outdoor Polymer Insulators

Authors: S. Thong-om, W. Payakcho, J. Grasasom, B. Marungsri

Abstract:

This paper presents the experimental results of salt fog ageing test of silicone rubber housing material for outdoor polymer insulator based on IEC 61109. Four types of HTV silicone rubber sheet with different amount of ATH were tested continuously 1000<=hours in salt fog chamber. By visual observation after tested, slightly surface erosion was observed on tested specimen surface near the energized end. Furthermore, increasing in hardness and reduction in hydrophobicity were measured on tested specimen comparing with new specimen. In addition, chemical analysis by ATRFTIR was conducted in order to elucidate the chemical change of tested specimens comparing with new specimen. Physical and chemical results confirmed the experimental results as well.

Keywords: Accelerated ageing test, HTV silicone rubber, housing material, salt fog test, surface erosion, polymer insulator.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070709

References:

[1] S. J. Clarson, J. A. Semlyem, "Siloxane Polymers", Prentice Hall, New Jersey,1993.
[2] CIGRE TF33.04.07, ³Natural and Artificial Ageing and Pollution Testing of Polymer Insulators", CIGRE Pub. 142, June 1999.
[3] T. Zhao and R. A. Bernstorf, "Ageing Tests of Polymeric Housing Materials for Non - ceramic Insulators", IEEE Electrical Insulation Magazine, Vol. 14, No. 2, March/April 1998, pp. 26 - 33.
[4] M. C. Arklove and J. C. Wheeler, "Salt - Fog Testing of Composite Insulators" 7th Int. Conf. on Dielctric Material, Measurements and Applications, Conf. Pub. No. 430, September 1996, pp. 296 - 302.
[5] B. Marungsri, H. Shinokubo, R. Matsuoka and S. Kumagai, "Effect of Specimen Configuration on Deterioration of Silicone Rubber for Ploymer Insulators in Salt Fog Ageing Test," IEEE Trans. on DEI, Vol.13, No. 1 , February 2006, pp. 129 - 138.
[6] L.S. Nasrat and A. Nosseir, "Evaluation of polymeric insulating materials under polluted conditions", CIGRE 2002, 15-402.
[7] T. Zhao and S. John, " Salt Fog Ageing Tests on Non -Ceramic Insulators and Fog Chamber Data Acquisition System", IEEE Conf. Electrical Insulation and Dielectric Phenomena, 1996. pp. 377-380.
[8] I. Gutman, R. Harting, R. Matsuoka and K. Kondo, "Experince with IEC 1109 1000TH Salt Fog Ageing Test for Composite Insulators",IEEE Electrical Insulation Magazine, Vol. 13, No. 3, May/June 1997, pp. 36 - 39.
[9] I. Gutman, R. Harting, R. Matsuoka and K. Kondo, "Experince with IEC 1109 1000TH Salt Fog Ageing Test for Composite Insulators",IEEE Electrical Insulation Magazine, Vol. 13, No. 3, May/June 1997, pp. 36 - 39.
[10] STRI Guide, ³Hydrophobicity Classification Guide´, 92/1, 1992.
[11] T. Zhao and R. A. Bernstorf "Ageing Tests of Polymeric Housing Materials for Non - Ceramic Insulators", IEEE Electrical Insulation Magazine, Vol. 14, No. 2, March/April 1998, pp. 26 - 33.
[12] ISO 868, "Plastics and ebonite Determination of indentation hardness by means of a durometer (Shore hardness)".