Enhanced charge injection in rough HVDC extruded cable interfaces
Artikel i vetenskaplig tidskrift, 2019

The insulation system of an HVDC extruded cable includes a variety of different material interfaces, especially within its cable accessories. Depending on interfacial manufacturing method, different degrees of surface roughness can be found and are here assessed. Based on detailed knowledge of insulation surface roughness, this paper proposes a new approach for calculations of electrical field distributions and injection current densities at the insulation surface. It is shown that local fields at rough material interfaces can be greatly enhanced, resulting also in field reduction in other areas along the surface. These calculations also reveal a distinct field threshold for space charge injection, likely leading to formation of homocharge layer adjacent to the interface. Existence of this homocharge layer at a rough surface (density of approximately 1 C/m(3)) is confirmed by means of space charge measurements.

charge injection

space charge measurement

HVDC extruded cable

cable peelings

field enhancement factor

physical interfaces

surface roughness

Författare

Espen Doedens

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

Nexans Norway AS

E. Markus Jarvid

Nexans Norway AS

Christian Frohne

Nexans Germany GmbH

Stanislaw Gubanski

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN)

Vol. 26 6 1911-1918

Ämneskategorier

Materialkemi

Annan kemi

Den kondenserade materiens fysik

DOI

10.1109/TDEI.2019.008213

Mer information

Senast uppdaterat

2020-01-24