Understanding performance of transmission and distribution insulators at very low temperature conditions
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ORIGINAL PAPER
Understanding performance of transmission and distribution insulators at very low temperature conditions Sounak Nandi1 · B. Reddy Subba1 · Dinesh Sharma1 Received: 4 September 2019 / Accepted: 11 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Polymeric or silicone rubber insulators are extensively used for high-voltage transmission by electrical utilities due to advantageous features like lightweight, better contamination performance, etc. The performance of silicone rubber insulators exposed to low temperature conditions with continuous application of electric stress is of utmost importance as these insulators are being used under such climatic conditions in the country. In the present work, long-term experimental investigations have been conducted for 1000 h at 0 °C and for 1500 h at − 20 °C with application of electrical stress to simulate near-field conditions. A special experimental arrangement has been established for the investigations. Leakage current was monitored at regular intervals, and further material evaluation techniques like Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX), mechanical strength measurements, etc., were conducted before and after the experimentation to verify the surface degradation on the polymer insulators. Some interesting results obtained during the experimentation for normal and polluted conditions along with the analysis carried out are presented. Keywords Composite insulators · High voltage engineering · Pollution · Condition monitoring
1 Introduction Polymeric insulators are the most popularly used among the available options like porcelain, glass, etc. Some of the significant characteristics of silicone rubber insulators include its better contamination flashover performance and lightweight. The excellent flashover resistance capability of silicone rubber insulators is due to their ability to prevent the water droplets from wetting the surface or hydrophobicity property [1, 2]. Several researchers have contributed abundantly pertaining to the performance of silicon rubber insulators. Hackam et al. [3] have discussed the aspects of polymeric insulators, dealt with various testing procedures and performance evaluation. Kumagai et al. [4] and Yoshimura et al. [5] studied the effect of various stresses on the performance of composite insulators and have conducted extensive material analysis * B. Reddy Subba [email protected] 1
High Voltage Laboratory, Department of Electrical Engineering, Indian Institute of Science, Bangalore 560012, India
for justifying their observation. They have also studied the hydrophobic recovery and impact of various stresses like corona and dry-band arcing on the material composition. Ilhan and Cherney [6] deals with the performance of the RTV coating on porcelain suspension insulator. El-Hag et al. [7] have shown the validity of using low frequency harmonic content of the leakage current as a diagnostic tool for identify
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