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Measuring electrical, thermal and mechanical properties of DC-stressed HTV silicone rubber loaded with nano/micro-fillers exposed to long-term aging

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Abstract

High-voltage polymeric insulators used on transmission lines are likely to degrade due to the multiple environmental stresses as well as electrical surface discharges. In this paper, multi-stress aging performance of high-temperature vulcanized silicone rubber (HTV-SR) filled with different concentrations of silica and alumina trihydrate (ATH) is explored under DC voltage for a period of 5000 h. The degradation of the test specimens has been studied using partial discharge measurement, thermogravimetric analysis, differential scanning calorimetry and mechanical strength analysis. Moreover, partial discharge performance was assessed to see its linkage to aging. When comparing the partial discharge data of the composite with the neat HTV-SR, it is observed that the partial discharge inception voltage of composite samples increases up to 50%. Furthermore, the number of discharge pulses and their magnitude is lower in the composite specimens as compared to the unfilled neat samples. This improvement appears to be caused by nano-particles which reduce oxidation reactions on the surface and the tightness of the bond between polymer matrix and nano-filler particles. The measured mechanical strength and thermal stability data also show the improved performance of hybrid composite samples. This investigation confirms that hybrid composites are quite resistant to aging as compared to neat HTV-SR.

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Authors and Affiliations

  1. Faculty of Electrical Engineering, GIK Institute of Engineering Sciences and Technology, Topi, 23640, Pakistan

    Rahmat Ullah & Muhammad Akbar

  2. Department of Electrical Engineering, University of Engineering and Technology, Taxila, 47080, Pakistan

    Salman Amin

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  1. Rahmat Ullah
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  2. Muhammad Akbar
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  3. Salman Amin
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Correspondence to Rahmat Ullah.

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Ullah, R., Akbar, M. & Amin, S. Measuring electrical, thermal and mechanical properties of DC-stressed HTV silicone rubber loaded with nano/micro-fillers exposed to long-term aging. Appl Nanosci 10, 2101–2111 (2020). https://doi.org/10.1007/s13204-020-01381-3

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