Abstract
Degradation in the polymeric insulators is caused due to the environmental stresses. The main aim of this paper is to explore the improved aging characteristics of hybrid samples by adding nano/micro silica in High Temperature Vulcanized Silicone Rubber (HTV-SiR) under long term accelerated aging conditions for 9000 hours. As HTV-SiR is unable to sustain environmental stresses for a long time, thus a long term accelerated aging behavior is an important phenomenon to be considered for field application. The aging characteristics of nano/micro filled HTV-SiR are analyzed by using techniques such as Scanning Electron Microscopy (SEM), Leakage Current (LC), Fourier Transform Infrared Microscopy (FTIR), Hydrophobicity Classification (HC), and breakdown strength for the aging time of 9000 hours. FTIR and leakage currents are measured after every cycle. All the co-filled samples revealed escalated aging characteristics as compared to the neat sample except the SN8 sample (8% nano-silica+20% micro-silica) after 9000 hours of aging. The highest loading of 6% and 8% nano-silica with 20% micro-silica do not contribute to the improved performance when compared with the neat and hybrid samples. However, from the critical experimental analysis, it is deduced that SN2 sample (2% nano-silica+20% micro-silica) is highly resistant to the long term accelerated aging conditions. SN2 has no cracks, lower loss percentages in the important FTIR absorption peaks, higher breakdown strength and superior HC after aging as compared to the unfilled and hybrid samples.
Highlights
The polymer insulators have gain more popularity over the ceramic insulators [1]
The High Temperature Vulcanized Silicone Rubber (HTV-SiR) is still under research due to degradation phenomenon when it is subjected to harsh weather/environmental conditions [5, 6]
Degradation phenomenon in the polymers exists due to the different stresses present in the environment, which is the main cause of aging in polymer insulators [7]
Summary
The polymer insulators have gain more popularity over the ceramic insulators [1]. Investigation of 9000 hours multi-stress aging effects on High-Temperature Vulcanized Silicone Rubber lightweight, ease of handling, improved performance in polluted environment, and handling [2,3,4]. The results indicate that the sample with micro-sized silica was found to have improved tracking/erosion resistance as compared to the non-filled and nano-filled insulator. This research work contributes towards the first time long-term aging characteristics of hybrids having high temperature vulcanized silicone rubber as base material for 9000 hours. The uniqueness of research lies in the preparation of hybrid samples and its long term accelerated aging analysis of 9000 hours in specific environmental conditions. In this article, aging characteristics of hybrid sample are investigated and compared with the neat sample. This phenomenon of the polymer degradation is observed by other authors [26]
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