Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions
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 prequa...
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2025-07-01
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| author | Bassel Diban Giovanni Mazzanti Rolando Ezequiel Diaz |
| author_facet | Bassel Diban Giovanni Mazzanti Rolando Ezequiel Diaz |
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| description | 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<sup>TM</sup> 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. |
| format | Article |
| id | doaj-art-cd007c3896084a0e9794f1b2e8d3ef4b |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj-art-cd007c3896084a0e9794f1b2e8d3ef4b2025-08-20T03:58:27ZengMDPI AGEnergies1996-10732025-07-011814365110.3390/en18143651Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test ConditionsBassel Diban0Giovanni Mazzanti1Rolando Ezequiel Diaz2Department of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, ItalyDepartment of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, ItalyDepartment of Electrical, Electronic and Information Engineering (DEI), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, 40136 Bologna, ItalyThe 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<sup>TM</sup> 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.https://www.mdpi.com/1996-1073/18/14/3651cablesextension of qualificationHVDCqualificationtype test |
| spellingShingle | Bassel Diban Giovanni Mazzanti Rolando Ezequiel Diaz Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions Energies cables extension of qualification HVDC qualification type test |
| title | Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions |
| title_full | Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions |
| title_fullStr | Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions |
| title_full_unstemmed | Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions |
| title_short | Life Estimation of HVDC Extruded Cables Subjected to Extension of Qualification Test Conditions and Comparison with Prequalification Test Conditions |
| title_sort | life estimation of hvdc extruded cables subjected to extension of qualification test conditions and comparison with prequalification test conditions |
| topic | cables extension of qualification HVDC qualification type test |
| url | https://www.mdpi.com/1996-1073/18/14/3651 |
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