Charge transport in a double-layered enamel insulation during surface potential decay
Artikel i vetenskaplig tidskrift, 2018

This work presents a numerical model for studying charge dynamics during decay of pre-deposited surface charges on an enamel insulation comprising two layers of different materials. It is shown that the considered surface charge decay is dominated by charge injection from insulation surface into the bulk and the drift of injected carriers along the direction of induced electric field. These features allow for estimating charge carriers' mobilities in the studied insulation. The developed model incorporates experimental outcomes as well as the proposed effect of an internal interface between insulating layers on hindering charge transport through the bulk. The transient process of charge accumulation at the internal interface is exhibited and correlated with the well-known Maxwell-Wagner-Sillars polarization model. Contribution of charge injection at each insulation surface into the bulk to the measured potential decay is evaluated and compared.

Charge transport

Charge injection

Maxwell-Wagner-Sillars polarization

Insulation-insulation interface

Enamel insulation

Surface potential decay


Tuan Anh Hoang

Chalmers, Elektroteknik, Högspänningsteknik

NKT High Voltage Cables

Yuriy Serdyuk

Elnät och komponenter

Stanislaw Gubanski

Elnät och komponenter

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN) 15584135 (eISSN)

Vol. 25 2 702-712


Fysikalisk kemi

Annan fysik

Den kondenserade materiens fysik



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