Space charge formation and its modified electric field under applied voltage reversal and temperature gradient in XLPE cable
By M. Fu, L. Dissado, George Chen, J. Fothergill. IEEE transactions on dielectrics and electrical insulation, 2008
166 citations recorded by the source corpus.
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.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1da5c0ecbc981bd9c34eba50c4a1d8f02ca21d3d
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Citations in the corpus
- Review of high voltage direct current cables (2015, methodology): “Particularly, after polarity reversal, the presence of space charge can lead to considerable electric field enhancement that is usually not acceptable and can easily cause failure in the insulation [71]–[74].”
- Polymeric insulation materials for HVDC cables: Development, challenges and future perspective (2017, background): “The worst condition about space charge is the formation of homocharges and then polarity reversal occurs [39, 40].”