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|Title:||Space Charge Formation and Its Modified Electric Field under Applied Voltage Reversal and Temperature Gradient in XLPE Cable|
Dissado, Len A.
Fothergill, John C.
|Publisher:||Institute of Electrical and Electronics Engineers (IEEE)|
|Citation:||IEEE Transactions on Dielectrics and Electrical Insulation, 2008, 15 (3), pp. 851-860.|
|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 cross-interface 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.|
|Rights:||This is the author's final draft of the paper published as IEEE Transactions on Dielectrics and Electrical Insulation, 2008, 15 (3), pp. 851-860. Copyright © 2008 IEEE. The final version is available from http://ieeexplore.ieee.org. Doi: 10.1109/TDEI.2008.4543123. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Leicester’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to firstname.lastname@example.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.|
|Appears in Collections:||Published Articles, Dept. of Engineering|
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