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Electrical treeing in XLPE insulation in frequency range between 20 and 500 Hz

Chen, G and Tham, C H (2005) Electrical treeing in XLPE insulation in frequency range between 20 and 500 Hz At 14th International Symposium on High Voltage Engineering, China. 25 - 29 Aug 2005. , CD-ROM.

Record type: Conference or Workshop Item (Paper)

Abstract

Electrical tree is one of the main reasons for long term degradation of polymeric materials used in high voltage ac applications. In this paper we report an investigation of electrical tree growth characteristics in XLPE samples from a commercial XLPE power cable. Electrical treeing has been grown over a frequency range from 20 Hz to 500 Hz and images were taken using CCD camera without interrupting the application of voltage. The fractal dimension of electric tree is obtained using a simple box-counting technique. Contrary to our expectation it has been found that the fractal dimension prior to the breakdown shows no significant change when frequency of the applied voltage increases. Instead, the frequency accelerates tree growth rate and reduces the time to breakdown. A new approach for investigating the frequency effect on trees has been devised. Besides looking into the fractal analysis of tree as a whole, regions of growth are being sectioned to reveal differences in terms of growth rate, accumulated damage and fractal dimension.

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More information

Published date: 2005
Additional Information: Event Dates: August 25 - 29, 2005
Venue - Dates: 14th International Symposium on High Voltage Engineering, China, 2005-08-25 - 2005-08-29
Keywords: electrical tree, fractal dimension, box-counting, variable frequency, growth rate, accumulated damage, partial discharge
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 261706
URI: http://eprints.soton.ac.uk/id/eprint/261706
ISBN: 7-302-01581-3
PURE UUID: dbc9c227-967e-4d78-9d7c-e3d5da111be7

Catalogue record

Date deposited: 19 Dec 2005
Last modified: 18 Jul 2017 08:59

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Contributors

Author: G Chen
Author: C H Tham

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