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

Espen Doedens, E. Markus Jarvid, Raphaël Guffond and Yuriy V. Serdyuk
Additional contact information
Espen Doedens: Department of Electrical Engineering, Chalmers University of Technology, SE-41258 Gothenburg, Sweden
E. Markus Jarvid: Nexans Norway AS, 70 Knivsøveien, NO-1788 Halden, Norway
Raphaël Guffond: Nexans Research Centre (NRC), 69007 Lyon, France
Yuriy V. Serdyuk: Department of Electrical Engineering, Chalmers University of Technology, SE-41258 Gothenburg, Sweden

Energies, 2020, vol. 13, issue 7, 1-24

Abstract: 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).

Keywords: surface roughness; charge injection; roughness enhanced charge injection; bipolar charge transport; hopping; trapping; detrapping; charge packets; electrical conduction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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