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Life Estimation and Investigation of Dielectric Strength and Siloxane Backbone of High Voltage Silicone Rubber Composites Under Accelerated Multistress Conditions

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Abstract

Room-temperature-vulcanized silicone rubber (RTV-SiR) is an excellent polymer for the coatings of high voltage outdoor insulators. However, like other polymers it also degrades by environmental stresses and lessens its service life. Silica-based composites may improve this behavior. To investigate the effect of multiple environmental stresses such as acid rain, heat, UV radiations, salt fog, etc., on silica-based composites, we prepared a sample neat SiR, two SiR nano-composites (5% and 2.5% nano-silica loading), an SiR micro-composite (15% micro-silica loading) and a hybrid composites (2% nano \(+\) 10% micro-silica loading). The prepared samples are subjected to accelerated multistress environment for a long term. Dielectric strength, leakage current and siloxane backbone are analyzed periodically during entire aging period. Composites showed improved characteristics and service life. Silicone rubber nano-composite with 5% nano-silica loading (SNC-5) showed longest estimated service life of 29 lab years in comparison with 19.8 lab years of neat silicone rubber. Similarly, after aging 17 kV/mm of dielectric of SNC-5 was highest among the all samples. Siloxane backbone also showed improved intactness in the case of SNC-5.

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Authors and Affiliations

  1. Department of Electrical Power Engineering, U.S.-Pakistan Center for Advanced Studies in Energy, National University of Sciences and Technology (NUST), Sector H-12, Islamabad, 44000, Pakistan

    Abraiz Khattak & Kashif Imran

  2. Department of Electrical Engineering, Ghulam Ishaq Khan Institute (GIKI) of Engineering Sciences and Technology, Topi, Pakistan

    Muhammad Amin

  3. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Adam Khan

  4. Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Adam Khan

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  1. Abraiz Khattak
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  4. Kashif Imran
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Correspondence to Adam Khan.

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Khattak, A., Amin, M., Khan, A. et al. Life Estimation and Investigation of Dielectric Strength and Siloxane Backbone of High Voltage Silicone Rubber Composites Under Accelerated Multistress Conditions. Arab J Sci Eng 44, 7149–7158 (2019). https://doi.org/10.1007/s13369-019-03839-1

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