Electrical Tree Growth in Polyethylene: Complementary Chemical and Structural Characterisation


(2004) Electrical Tree Growth in Polyethylene: Complementary Chemical and Structural Characterisation At International Conference on Solid Dielectrics IEEE, Piscataway, NJ., pp. 292-295.

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Description/Abstract

Electrical treeing is an electric breakdown process of considerable technological importance to the electrical power industry. In the work described here, complementary high resolution analytical techniques were applied to characterise tree structures grown in polyethylene. A combination of confocal Raman microprobe spectroscopy and 3-D optical reconstruction techniques has been used to characterise the physical microstructure and chemical composition of electrical trees. It was found that in tree structures in which partial discharges occurred within the main body of the tree, the dominant Raman characteristic is massive fluorescence. In trees where discharge activity was confined to the tree tips, the Raman bands of polyethylene are seen throughout the body of the tree, but superimposed on pronounced fluorescence. Other than at the tree tips, the G and D bands of sp2 hybridised carbon are also seen. The chemical details of both tree types are therefore consistent with the discharge patterns and with the carbon acting to increase tree channel conductivity.

Item Type: Conference or Workshop Item (Speech)
Additional Information: Event Dates: 5-9 July 2004
Keywords: Electrical treeing, Raman spectroscopy, dielectric breakdown
ePrint ID: 259759
Date Deposited: 13 Aug 2004
Last Modified: 31 Mar 2016 14:01
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/259759

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