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Study of temperature distribution along an artificially polluted insulator string

Reddy, Subba B and Nagabhushana, GR (2003) Study of temperature distribution along an artificially polluted insulator string. In: Plasma Science and Technology, 5 (2). pp. 1715-1720.

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Official URL: http://iopscience.iop.org/1009-0630/5/2/006


Insulator becomes wet partially or completely, and the pollution layer on it becomes conductive, when collecting pollutants for an extended period during dew, light rain, mist, fog or snow melting. Heavy rain is a complicated factor that it may wash away the pollution layer without initiating other stages of breakdown or it may bridge the gaps between sheds to promote flashover. The insulator with a conducting pollution layer being energized, can cause a surface leakage current to flow (also temperature-rise). As the surface conductivity is non-uniform, the conducting pollution layer becomes broken by dry bands (at spots of high current density), interrupting the flow of leakage current. Voltage across insulator gets concentrated across dry bands, and causes high electric stress and breakdown (dry band arcing). If the resistance of the insulator surface is sufficiently low, the dry band arcs can be propagated to bridge the terminals causing flashover. The present paper concerns the evaluation of the temperature distribution along the surface of an energized artificially polluted insulator string.

Item Type: Journal Article
Publication: Plasma Science and Technology
Publisher: Science China Press
Additional Information: Copyright of this article belongs to Science China Press.
Keywords: temperature distribution;artificially polluted insulator string
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 24 Aug 2011 06:21
Last Modified: 24 Aug 2011 06:21
URI: http://eprints.iisc.ac.in/id/eprint/40235

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