Electrical Treeing Characteristics in XLPE Power Cable Insulation in Frequency Range between 20 and 500 Hz
Electrical Treeing Characteristics in XLPE Power Cable Insulation in Frequency Range between 20 and 500 Hz
Electrical treeing is one of the main reasons for long term degradation of polymeric materials used in high voltage ac applications. In this paper we report on an investigation of electrical tree growth characteristics in XLPE samples from a commercial XLPE power cable. Electrical trees have been grown over a frequency range from 20 Hz to 500 Hz and images of trees 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. In addition to 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.
Electrical tree, fractal dimension, box-counting, variable frequency, growth rate, accumulated damage, partial discharge
179-188
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Tham, C H
752baf29-4316-4561-a293-620fb698cd4b
February 2009
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Tham, C H
752baf29-4316-4561-a293-620fb698cd4b
Chen, George and Tham, C H
(2009)
Electrical Treeing Characteristics in XLPE Power Cable Insulation in Frequency Range between 20 and 500 Hz.
IEEE Transactions on Dielectrics & Electrical Insulation, 16 (1), .
Abstract
Electrical treeing is one of the main reasons for long term degradation of polymeric materials used in high voltage ac applications. In this paper we report on an investigation of electrical tree growth characteristics in XLPE samples from a commercial XLPE power cable. Electrical trees have been grown over a frequency range from 20 Hz to 500 Hz and images of trees 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. In addition to 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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Published date: February 2009
Keywords:
Electrical tree, fractal dimension, box-counting, variable frequency, growth rate, accumulated damage, partial discharge
Organisations:
EEE
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Local EPrints ID: 267137
URI: http://eprints.soton.ac.uk/id/eprint/267137
ISSN: 1070-9878
PURE UUID: 38de5d9a-9abf-400a-80b9-ceef154efea0
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Date deposited: 23 Feb 2009 14:17
Last modified: 14 Mar 2024 08:43
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Author:
George Chen
Author:
C H Tham
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