Space Charge Formation and its Modified Electric Field under Applied Voltage Reversal and Temperature Gradient in XLPE Cable


Fu, Mingli , Dissado, L.A., Chen, George and Fothergill, J.C. (2008) Space Charge Formation and its Modified Electric Field under Applied Voltage Reversal and Temperature Gradient in XLPE Cable. IEEE Transactions on Dielectrics and Electrical Insulation, 15, (3), 851-860. (doi:10.1109/TDEI.2008.4543123).

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Description/Abstract

The results of space charge evolution in cross-linked polyethylene power cables under dc electrical field at a uniform temperature and during external voltage polarity reversal are presented in the paper. A mirror image charge distribution was observed in the steady state, but the pre-existing field altered the way in which the steady state charge distribution was formed from that obtaining when the cable was first polarized. Polarity reversing charge was generated in the middle of the insulation and moved towards the appropriate electrodes under the influence of a field in excess of the maximum applied field. Our results show that the mirror effect is a steady state effect that is due to crossinterface currents that depend only on the interface field and not its polarity. Measurements on cable sections with an elevated mean temperature and temperature gradient show that the interface currents are temperature dependent, and that differences between the activation energies of the interface and bulk currents can eliminate and possibly even invert the polarity of the space charge distribution

Item Type: Article
ISSNs: 1070-9878
Keywords: Space charge, PEA, XLPE insulated power cables, voltage polarity reversal, temperature gradient, “mirror image effect”
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science
Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 266111
Date Deposited: 11 Jul 2008 13:36
Last Modified: 27 Mar 2014 20:11
Further Information:Google Scholar
ISI Citation Count:11
URI: http://eprints.soton.ac.uk/id/eprint/266111

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