Life Estimation of HVDC Cables Subjected to Fast and Slow Polarity Reversals

Bassel Diban, Giovanni Mazzanti, Massimo Marzinotto () and Antonio Battaglia
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Bassel Diban: Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
Giovanni Mazzanti: Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
Massimo Marzinotto: TERNA, Via Attilio Benigni 21, 00156 Rome, Italy
Antonio Battaglia: TERNA, Via Attilio Benigni 21, 00156 Rome, Italy

Energies, 2024, vol. 17, issue 13, 1-12

Abstract: This paper aims at estimating the life of extruded HVDC cable insulation subjected to fast and slow voltage polarity reversals (VPRs). An ad hoc MATLAB code is used for the transient electric field simulation in the cable insulation thickness by solving numerically Gauss, ohm, and current continuity equations beside a macroscopic conductivity equation. A transient temperature is also considered during slow VPR transients. The results show a significant localized reduction in the life of the inner insulation, making the life distribution non-monotonous inside the insulation thickness. The results show that fast VPRs are the most stressing transients in this study. The longer the duration of the zero-voltage period in slow VPR, the less stressed the insulation, hence, the longer the local life in the inner insulation of the cable. The latter is justified by the charge relaxation during slow VPRs.

Keywords: HVDC cables; reliability; life estimation; aging; cable insulation; transients; polarity reversal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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