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Electrical Treeing in Power Cable Insulation under Harmonics Superimposed on Unfiltered HVDC Voltages

1
Department of Engineering and Mathematics, Sheffield Hallam University, Sheffield S1 1WB, UK
2
Department of Engineering, Glasgow Caledonian University, Glasgow G4 0BA, UK
3
Faculty of Industrial Education, Helwan University, 11795 Helwan, Egypt
4
School of Engineering, Cardiff University, Cardiff CF10 3AT, UK
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3113; https://doi.org/10.3390/en12163113
Received: 28 June 2019 / Revised: 13 August 2019 / Accepted: 13 August 2019 / Published: 14 August 2019
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Abstract

Insulation degradation is an irreversible phenomenon that can potentially lead to failure of power cable systems. This paper describes the results of an experimental investigation into the influence of direct current (DC) superimposed with harmonic voltages on both partial discharge (PD) activity and electrical tree (ET) phenomena within polymeric insulations. The test samples were prepared from a high voltage direct current (HVDC) cross linked polyethylene (XLPE) power cable. A double electrode arrangement was employed to produce divergent electric fields within the test samples that could possibly result in formation of electrical trees. The developed ETs were observed via an optical method and, at the same time, the emanating PD pulses were measured using conventional techniques. The results show a tenable relation between ETs, PD activities, and the level of harmonic voltages. An increase in harmonic levels has a marked effect on development of electrical trees as the firing angle increases, which also leads to higher activity of partial discharges. This study of the influencing operational parameters of HVDC converters on power cable insulation is predicted to contribute to enhancements in cable design and progressive advancement in condition monitoring and insulation diagnostic techniques that can lead to more effective asset management in HVDC systems. View Full-Text
Keywords: degradation; HVDC transmission; insulation; harmonics; partial discharges; polymers; power cable insulation; electrical trees degradation; HVDC transmission; insulation; harmonics; partial discharges; polymers; power cable insulation; electrical trees
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MDPI and ACS Style

Azizian Fard, M.; Farrag, M.E.; Reid, A.; Al-Naemi, F. Electrical Treeing in Power Cable Insulation under Harmonics Superimposed on Unfiltered HVDC Voltages. Energies 2019, 12, 3113.

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