Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II - Simulations of Charge Transport
Journal article, 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).

charge injection


surface roughness

charge packets


bipolar charge transport


roughness enhanced charge injection

electrical conduction


Espen Doedens

Nexans Norway AS

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components

E. Markus Jarvid

Nexans Norway AS

Raphaël Guffond

Nexans Research Centre (NRC)

Yuriy Serdyuk

Chalmers, Electrical Engineering, Electric Power Engineering, Power grids and Components


1996-1073 (ISSN)

Vol. 13 7 1750-1774

Areas of Advance


Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering



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