Roughness Enhanced Charge Injection and Field Dependent Conduction Mechanisms for Bipolar Charge Transport Models
Paper in 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.

surface roughness

HVDC cable

space charge

electric field


Espen Doedens

Chalmers, Electrical Engineering, Electric Power Engineering

E. Markus Jarvid


Yuriy Serdyuk

Chalmers, Electrical Engineering, Electric Power Engineering

Proceedings of the 2020 IEEE 3rd International Conference on Dielectrics, ICD 2020

9781728189833 (ISBN)

IEEE International Conference on Dielectrics
Valencia, Spain,

Subject Categories

Manufacturing, Surface and Joining Technology

Other Electrical Engineering, Electronic Engineering, Information Engineering

Areas of Advance






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