Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions

Bassel Diban, Giovanni Mazzanti () and Rolando Ezequiel Diaz
Additional contact information
Bassel Diban: Department of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
Giovanni Mazzanti: Department of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
Rolando Ezequiel Diaz: Department of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy

Energies, 2025, vol. 18, issue 14, 1-20

Abstract: The goal of this paper is to evaluate the life of HVDC extruded cables subjected to the extension of qualification test (EQT) load cycles, introduced by Cigrè Technical Brochure 852, as well as to compare the results thus obtained with those formerly obtained by the authors in the case of the prequalification test (PQT) load cycles. This goal has been achieved in the present investigation by properly modifying a previously developed procedure for the life and reliability estimation of HVDC cables—implemented in Matlab TM environment—to make it applicable to EQT load cycles in addition to PQT and type test load cycles, which are already considered in the former version of the procedure. Considering a 500 kV DC-XLPE cable as the case study, the time-varying temperature profile and electric field profile within the cable insulation are calculated. Then, the fractions of life lost and the life of the cable at five locations within the insulation thickness are evaluated by means of a proper electrothermal life model. A comparison between the electric field distributions, fractions of life lost, and cable life under EQT and PQT is carried out. In this way, important features of the EQT compared to the PQT load cycles are singled out, and eventually, a new modified extension of qualification test (MEQT) is proposed as a feasible and meaningful compromise between the pros and cons of the EQT and PQT.

Keywords: cables; extension of qualification; HVDC; qualification; type test (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: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/14/3651/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/14/3651/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:14:p:3651-:d:1698791

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().