Some hints at the combined effects of load cycles and electrothermal stress on HVDC extruded cable reliability in the long term prequalification test

Marzinotto, M.; Mazzanti, G.

doi:10.1109/ceidp.2012.6378802

Cited by 4 publications

(21 citation statements)

References 3 publications

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“…Phenomenological models have also larger success in the cable industry and, as a consequence, in technical recommendations [20]- [24]. The combination of such models has enabled cable-insulation-life modeling under electrothermal stress, i.e., the combination of electrical and thermal stress, which are the predominant stresses for loaded cables in service, when both temperature and voltage are applied [14], [19], [25].…”

Section: Inverse Power Model Arrhenius Model and The Combined Arrhementioning

confidence: 99%

The practical effect of the enlargement law on the electrothermal life model for power-cable lines

Marzinotto

Mazzanti

2015

IEEE Electr. Insul. Mag.

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Section: Inverse Power Model Arrhenius Model and The Combined Arrhementioning

confidence: 99%

The practical effect of the enlargement law on the electrothermal life model for power-cable lines

Marzinotto

Mazzanti

2015

IEEE Electr. Insul. Mag.

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“…As shown in [5], an electro-thermal life model of the same form as that after [6], [7] for HVAC extruded cables can be employed also for HVDC extruded cables. Considering an extruded HVDC power cable whose rated (design) voltage, electric field and temperature are U 0 , E D and T D , respectively, this electro-thermal life model is a combination of the above electrical IPM with the popular Arrhenius thermal model, i.e.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The relevant value of P D is not specified in [3], but modern probabilistic cable design requires that P D should be very low, thereby attaining a low failure probability at the end of cable system service life: here a value of P D =0.01 (i.e. 1%) is taken, fairly lower than that taken in [5], namely P D =0.05.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…This concept is highlighted here with respect to [5] (where for the sake of simplicity -being that the first approach to such a problem -the temperature variation was emphasized compared to the field variation). In this framework, electrothermal cable life can be estimated from Miner's law of cumulated aging [5]- [7].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…No thermal and/or synergistic electro-thermal aging effect relevant to load cycles is either mentioned or considered analytically. A former paper by these authors [5] has proposed a preliminary evaluation method of failure time percentiles in the LCPQ test that takes into account also the time-varying temperature during load cycles. The method -based on Miner's law of cumulated aging and on an improved IPM catering for the DC electro-thermal life stress inserted within a probabilistic Weibull-based framework [6], [7] -was applied in [5] for the first time to a typical HVDC cable system for VSC, accounting also for electric field profile inversion from zero to full load.…”

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confidence: 99%

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More insight into the effects of load cycles and electrothermal stress on HVDC extruded cable reliability in the prequalification test

Mazzanti

Marzinotto

2013

2013 IEEE Power &Amp; Energy Society General Meeting

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The long-term prequalification (PQ) test of HVDC extruded cable systems according to CIGRE Technical Brochure (TB) 496 consists of a one year long series of "24 hours" load cycles. The duration of this load cycle test relies on a design life of 40 years at constant rated voltage and on an IPM voltage-time characteristic, without any explicit consideration of thermal and synergistic electro-thermal aging effects related to load cycles. Here, as a sequel of a former investigation, a previously proposed method for estimating failure time percentiles of HVDC extruded cables that accounts for the time-varying temperature during the PQ test load cycles is refined. Moreover, the application of the method is broadened for assessing the sensitivity of a typical HVDC cable design to the electrothermal stress levels within insulation thickness, as well as to the variation of insulation resistivity dependence on temperature and electric field. Index Terms--HVDC Extruded Cables, Prequalification Tests, Electrothermal Life Model. I. INTRODUCTIONS far as long-distance, high-power underground or underwater transmission is concerned, High Voltage Direct Current (HVDC) cable links are in general either the best or the only option. Thanks to recent R&D efforts, the voltage rating of extruded HVDC cable systems has now raised up to 300 kV and above, and commercial HVDC extruded cable system projects at the 320 kV level are being undertaken [1], [2]. In this perspective, the new CIGRE Technical Brochure (TB) 496 [3] has extended up to the 500 kV level the "Recommendations for testing dc extruded cable systems" that in former TB 219 were holding up to a rated voltage of 250 kV.According to CIGRE TB 496, the long-term prequalification (PQ) test of HVDC extruded cable systems has to be carried out applying to a proper cable loop, under constant DC voltage, a sequence of 360 daily load cycles, since the longterm PQ test "…is intended to indicate the long-term performance of the complete cable system" [3]. The sequence differs between cable systems for Current Source Line Commutated Converters (LCC) and for Voltage Source Converters (VSC), and includes full load, zero-load and heating-cooling cycles.The duration of the long-term load cycles PQ (LCPQ) test G. Mazzanti is with ). M. Marzinotto is with TERNA Rete Italia S.p.A.,

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Effect of Pre-Qualification Test on Space Charge Accumulation Phenomenon

Imburgia,

Romano,

Rizzo

et al. 2023

2023 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Some hints at the combined effects of load cycles and electrothermal stress on HVDC extruded cable reliability in the long term prequalification test

Cited by 4 publications

References 3 publications

The practical effect of the enlargement law on the electrothermal life model for power-cable lines

The practical effect of the enlargement law on the electrothermal life model for power-cable lines

More insight into the effects of load cycles and electrothermal stress on HVDC extruded cable reliability in the prequalification test

Effect of Pre-Qualification Test on Space Charge Accumulation Phenomenon

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