Numerical Investigations of ReBCO Conductors With High Limitation Electric Field for HVDC SFCL

Escamez, Guillaume; Vialle, Julien; Bruzek, Christian-Éric; Grose, Veit; Bauer, Markus; Tixador, Pascal

doi:10.1109/tasc.2018.2805998

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…The maximum electric field for commercial available YBCO tape is limited to 50 V/m. Advanced superconducting tape is under development, which aims to increase the electric field higher than 100 V/m [31,32]. This has great potential to significantly reduce the total length of superconducting tape needed for HVDC SFCL application.…”

Section: Hvdc Breaker Designmentioning

confidence: 99%

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Marsh

Barnes²,

Crowther³

et al. 2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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Section: Hvdc Breaker Designmentioning

confidence: 99%

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Marsh

Barnes²,

Crowther³

et al. 2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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“…Taking into account all above considerations, as well as many HTS tape fabrication constraints in the FASTGRID project, it was decided to solder a 500 µm thick Hastelloy shunt on top of the HTS tape to increase its robustness. This choice of tape architecture was supported by several numerical simulations [10,11].…”

Section: Introductionmentioning

confidence: 96%

“…As the critical current of HTS tapes increases thanks to recent technological advancements (more than 1300 A/cm-width at 77 K, self-field [8,9]), the time between the creation of a normal zone and a subsequent local degradation of the critical current is reduced. To avoid a thermal runaway, it has been shown that the electrical resistance of the metallic layers must be kept below some threshold that depends on the critical current [10,11]. On the other hand, for a prospective fault current that is much higher than the critical current of the HTS tape ('homogeneous quench' regime), the electrical resistance of the metallic layers must be kept above some threshold in order to limit the current intensity and the associated Joule heating.…”

Section: Introductionmentioning

confidence: 99%

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Lacroix¹,

Lavergne²,

Leduc³

et al. 2021

Supercond. Sci. Technol.

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High-voltage direct current transmission systems are expected to allow the transmission of huge volumes of electricity over long distances. The use of superconducting fault current limiters (SFCLs) based on second-generation (2G) high-temperature superconductor (HTS) coated conductors (CCs) is a promising solution to mitigate fault currents in DC transmission systems. To fabricate a SFCL whose size remains acceptable, which means minimizing the length of the HTS tape used, the tape must sustain a high electric field during the whole fault duration. In this paper, high performance commercial 2G HTS CCs from THEVA (more than 750 A/cm-width at 77 K in self-field), on which a 500 µm thick Hastelloy shunt was soldered, were tested by submitting them to faults of different amplitudes and durations. Measurements revealed that these HTS tapes could sustain any type of fault up to 100 V m−1, lasting up to 50 ms. Three-dimensions finite element simulations were able to reproduce accurately the experiments by using the appropriate temperature dependence of the critical current density and power law index, and by accounting for the variations in the local critical current along the length of the HTS tapes.

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“…Nevertheless, in the second generation of HTS tapes prepared in form of coated conductors (CCs), a fluctuation of the conductor's critical current has been commonly detected just after its production [35][36][37][38][39][40][41][42][43]. This phenomenon, nicknamed the 'I c (x) feature', attracted a lot of interest in the research focused on the development of a resistive fault current limiter (FCL) device [44][45][46][47][48]. Dedicated numerical modeling methods were developed to reproduce all the essential features of the electro-thermal problem in the composite CC tape [40,[49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Stability of DC transport in HTS conductor with local critical current reduction

Gömöry

Šouc

2021

Supercond. Sci. Technol.

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A common feature of commercially available conductors based on high-temperature superconducting compounds is the fluctuation of critical current along the length. Fortunately, the practice adopted by manufacturers nowadays is to supply the detailed I c(x) data with the conductor. Compared to knowing just the average of critical current, this should also allow a much better prediction of the conductor performance. Statistical methods are suitable for this purpose in the case when the fluctuations are regular at the low end of critical current distribution. However, a different approach is necessary at the presence of ‘weak spots’ that drop out of any statistics. Because of the strong nonlinearity of the current–voltage curve, such a location could transform into a ‘hot spot’ at transporting direct current (DC), with an abrupt increase of temperature endangering the conductor operation. We present a set of analytical formulas including the prediction of the maximum DC that could be carried sustainably before the thermal runaway appears. It is necessary to know the cooling conditions as well as the properties of the conductor constituents and their architecture. A formula for the voltage appearing on a weak spot, and its dependence on the DC, is also proposed. For this purpose the result of previous theoretical work has been slightly modified after comparing it with numerical iterative computations and finite element modeling. We demonstrate that the derived model allows a powerful analysis of experimental data comprising an estimation of the weak spot parameters i.e. its critical current and the length of the defect zone.

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Numerical Investigations of ReBCO Conductors With High Limitation Electric Field for HVDC SFCL

Cited by 13 publications

References 13 publications

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Stability of DC transport in HTS conductor with local critical current reduction

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Numerical Investigations of ReBCO Conductors With High Limitation Electric Field for HVDC SFCL

Cited by 13 publications

References 13 publications

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Virtual Reality Interface for HVDC Substation and DC Breaker Design and Maintenance

Successful DC current limitation above 100 Vm−1 for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Stability of DC transport in HTS conductor with local critical current reduction

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Product

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About

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width