Roughness Enhanced Charge Injection and Field Dependent Conduction Mechanisms for Bipolar Charge Transport Models
Paper i proceeding, 2020

Extruded HVDC cable systems contain a multitude of different interface types. Physical interfaces are introduced onsite when the outer semi-conductive layer is removed prior to installing a pre-molded joint or stress-cone onto the cable end. Such interfaces are characterized by surface roughness, which
can locally enhance electric field and stimulate charge injection at microscale asperities. This work studies the impact of surface roughness on charge injection by performing space charge measurements on cable peelings and evaluating the observed charge evolution with a bipolar charge model. The behavior during both polarization and depolarization stages was investigated. A unique set of conduction and injection parameters is suggested allowing for realistic interpretation of charge accumulation and decay observed in the measurements.

space charge

HVDC cable

surface roughness

electric field


Espen Doedens

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

E. Markus Jarvid

Nexans Norway AS

Yuriy Serdyuk

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

2020 IEEE International Conference on Dielectrics, ICD 2020


IEEE International Conference on Dielectrics
Valencia, Spain,


Bearbetnings-, yt- och fogningsteknik

Annan elektroteknik och elektronik







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