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Article

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport

1
Department of Electrical Engineering, Chalmers University of Technology, SE-41258 Gothenburg, Sweden
2
Nexans Norway AS, 70 Knivsøveien, NO-1788 Halden, Norway
3
Nexans Research Centre (NRC), 69007 Lyon, France
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1750; https://doi.org/10.3390/en13071750
Received: 1 March 2020 / Revised: 29 March 2020 / Accepted: 31 March 2020 / Published: 6 April 2020
Extruded high voltage direct current (HVDC) cable systems contain interfaces with poorly understood microscopic properties, particularly surface roughness. Modelling the effect of roughness on conduction in cable insulation is challenging, as the available results of macroscopic measurements give little information about microscopic charge distributions at material interfaces. In this work, macroscopic charge injection from interfaces is assessed by using a bipolar charge transport model, which is validated against a series of space charge measurements on cable peelings with different degrees of surface roughness. The electric field-dependent conduction and charge trapping effects stimulated by the injection current originating from rough surfaces are assessed. It is shown that by accounting for roughness enhanced charge injection with the parameters derived in part I of the paper, reasonable agreement between computed and measured results can be achieved at medium field strengths (10–40 kV/mm). View Full-Text
Keywords: surface roughness; charge injection; roughness enhanced charge injection; bipolar charge transport; hopping; trapping; detrapping; charge packets; electrical conduction surface roughness; charge injection; roughness enhanced charge injection; bipolar charge transport; hopping; trapping; detrapping; charge packets; electrical conduction
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MDPI and ACS Style

Doedens, E.; Jarvid, E.M.; Guffond, R.; Serdyuk, Y.V. Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport. Energies 2020, 13, 1750. https://doi.org/10.3390/en13071750

AMA Style

Doedens E, Jarvid EM, Guffond R, Serdyuk YV. Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport. Energies. 2020; 13(7):1750. https://doi.org/10.3390/en13071750

Chicago/Turabian Style

Doedens, Espen, E. M. Jarvid, Raphaël Guffond, and Yuriy V. Serdyuk 2020. "Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport" Energies 13, no. 7: 1750. https://doi.org/10.3390/en13071750

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