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. In, 14th International Symposium on High Voltage Engineering, Beijing, China, 25 - 29 Aug 2005. Tsinghua University Press, CD-ROM.

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Description/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.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Event Dates: August 25 - 29, 2005
ISBNs: 7302015813
Keywords: electrical tree, fractal dimension, box-counting, variable frequency, growth rate, accumulated damage, partial discharge
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science
Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 261706
Date Deposited: 19 Dec 2005
Last Modified: 27 Mar 2014 20:04
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/261706

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