Detection of Electrical Tree Formation in XLPE Insulation through Applying Disturbed DC Waveforms
Journal article, 2021

Initiation and growth of electrical trees can be linked to the development of partial discharge (PD) activity within an insulation system. We present in this paper changes in PD characteristics that appear during the electrical tree growth in a crosslinked polyethylene (XLPE) based insulation at different stages of its degradation. A DC voltage with superimposed high frequency component is applied to the material specimens for the detection and characterization of PD traces observed during the degradation. The method is flexible and offers a possibility to vary DC voltage level independently of the superimposed disturbance, its frequency and rise time, including rapid voltage steps. It also enables to create a phase-locked phase-resolved PD pattern (PRPD) facilitating various analyses of the characteristics. It is postulated that measurements of the changes in PD characteristics found under such excitations can be used for performing diagnostics and prognostics of material condition. This approach also implies new possibilities to evaluate different material concepts.


polarity effect


power electronics

space charge energy

time-to- failure


partial discharge (PD)

energy dissipation

tree inception voltage


Thomas Hammarström

Chalmers, Electrical Engineering, Electric Power Engineering

Stanislaw Gubanski

Chalmers, Electrical Engineering, Electric Power Engineering

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN)

Vol. 8 5 1669-1676

Mechanisms of partial discharges in polymeric HVDC power cables

Chalmers, 2018-08-01 -- .

Driving Forces

Sustainable development

Areas of Advance


Materials Science

Subject Categories

Atom and Molecular Physics and Optics

Other Electrical Engineering, Electronic Engineering, Information Engineering


Chalmers Materials Analysis Laboratory



More information

Latest update