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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 & Electrical Insulation, 15, (3), pp. 851-860. (doi:10.1109/TDEI.2008.4543123).

Record type: Article


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

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Published date: June 2008
Keywords: Space charge, PEA, XLPE insulated power cables, voltage polarity reversal, temperature gradient, “mirror image effect”
Organisations: Electronics & Computer Science, EEE


Local EPrints ID: 266111
ISSN: 1070-9878
PURE UUID: 809ec6bb-f22d-4bdf-a4dd-25ec17c442af

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Date deposited: 11 Jul 2008 13:36
Last modified: 18 Jul 2017 07:20

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Author: Mingli Fu
Author: L.A. Dissado
Author: George Chen
Author: J.C. Fothergill

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