DC Electrical Trees in Polymer Insulation Inflicted by Rapidly Decreasing Short Circuit Voltage Flanks
Paper in proceeding, 2022

This work aims to study the appearance and changes in the partial discharge pattern due to electrical treeing degradation of XLPE, a copolymer blend, crosslinked through a byproduct-free curing reaction, and LDPE when exposed to a series of high voltage short circuits. A wire-plane type test object has been employed and the presence of electrical trees were detected visually and by measuring the partial discharge (PD) activity. It was observed that PD characteristics changed with increased number of short circuit events. In particular, both the summed amount of PD magnitudes as well as the number of PDs increased due to the growth of electrical trees. These results were in good agreement with the hypothesis of electromechanical stresses analogue to mechanical crack formation which increase the volume of the defects thus affecting the PD characteristics. Additionally, clear differences in the phase distribution of PDs were observed that allows to use them as indicators of material performance and as complement to DC conductivity measurements and frequency domain spectroscopy.

Author

Thomas Hammarström

Chalmers, Electrical Engineering, Electric Power Engineering

Sarath Kumara

Chalmers, Electrical Engineering, Electric Power Engineering

Xiangdong Xu

Chalmers, Electrical Engineering, Electric Power Engineering

Amir Masoud Pourrahimi

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Yuriy Serdyuk

Chalmers, Electrical Engineering, Electric Power Engineering

ICD 2022 - IEEE 2022 4th International Conference on Dielectrics, Proceedings

154-157
978-1-6654-1833-1 (ISBN)

2022 IEEE 4th International Conference on Dielectrics (ICD)
Palermo, Italy,

Advanced characterization of new insulation materials for next generation of HVDC power cables

Chalmers, 2019-01-01 -- 2020-12-31.

Driving Forces

Sustainable development

Subject Categories

Medical Laboratory and Measurements Technologies

Textile, Rubber and Polymeric Materials

Other Chemical Engineering

Areas of Advance

Energy

Materials Science

Infrastructure

Chemical Imaging Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1109/ICD53806.2022.9863220

More information

Latest update

10/27/2023