Corona Degradation of the Polymer Insulator Samples under Different Fog Conditions

Reddy, Subba B and Prasad, Shakthi D (2016) Corona Degradation of the Polymer Insulator Samples under Different Fog Conditions. In: IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, 23 (1). pp. 359-367.

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Abstract

Corona discharges resulting from the metal parts of insulators and the line hardware affect the long term performance of the polymeric insulators used for outdoor application and can lead to its eventual failure. The authors previous work, involved in developing a new methodology to evaluate the performance of polymeric shed materials subjected to corona stresses in the presence of natural fog condition, results revealed more surface hydroxylation thereby resulting in more loss of hydropobhicity. With the increase in industrialization, there is an increase in acidic component of the rain as well as the fog (moisture). The present work, reports the effect of acid fog on the corona performance of the polymeric insulators for both AC and DC excitation, interesting results are obtained. A comparison of the experimental investigations revealed that the acidic fog has more effect than that of the normal fog. This fact has been confirmed by physico-chemical analysis like the scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS) and contact angle measurement. The effect of DC corona is found to be lesser in comparison with the AC; however the hydroxylation induced by the DC corona under the presence of fog is similar with that of AC excitation.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	acidic fog; Corona; Fourier transform infrared spectroscopy; moisture; silicone rubber; surface oxidation; leakage current
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	23 Apr 2016 07:18
Last Modified:	23 Apr 2016 07:18
URI:	http://eprints.iisc.ac.in/id/eprint/53695

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