Numerical and Experimental Analysis of Normal Zone Propagation on 2G HTS Wires

Pelegrin, Jorge; Martínez, Elena; Angurel, L.A.; Xie, Yiyuan; Selvamanickam, V.

doi:10.1109/tasc.2010.2084982

Cited by 38 publications

(25 citation statements)

References 9 publications

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“…(1), with the values collected for 70 K in Table II, we have estimated the radial thermal conductivities, k ⊥ ∼ 0.21 and 0.30 W · K −1 · m −1 for coils C and E, respectively. If we consider the value obtained in [9] for the thermal conductivity in the tangential direction, k // = 261 W · K −1 · m −1 , the expected anisotropy [5] would be (k // /k ⊥ ) 1/2 ∼ 35.2 and TABLE II THERMAL CONDUCTIVITIES AND COIL VOLUME PROPORTIONS 29.5 for coils C and E, respectively, which are very similar to the values obtained experimentally.…”

Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velosupporting

confidence: 74%

“…The tangential v p component ranges are between 25 to 40 mm/s, which are a factor ∼1.5 lower than the ones measured in similar conditions for the used tapes [5]. This v p lowering has been also observed in MgB 2 conductors and coils [4] and ascribed to the higher coil thermal conductivity and inertia of surrounding insulation layers, epoxy binders and conductors.…”

Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velomentioning

confidence: 53%

“…These values show weak temperature dependence, as expected by the small thermal conductivity and specific heat changes of the used composite materials in this range of temperatures. It should be remarked that, in this temperature range, the coil's MQE values increases with temperature in opposition with the observed behavior on straight pieces of the same Cu-stabilized tapes [5], [6]. Nevertheless, other authors have already observed this unexpected behavior on similar 2 mm wide tapes without thermal stabilizer [7].…”

Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velomentioning

confidence: 56%

See 2 more Smart Citations

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Núñez-Chico

Martínez

Angurel

et al. 2015

IEEE Trans. Appl. Supercond.

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Degradation of superconducting critical currents of 2G-HTS coils may appear upon thermal cycling due to the tensile stress differences of its elements that induce increasing tape damages. We report on the thermal cycling and thermal stability effects of round epoxy-impregnated pancake coils under two cooling conditions (liquid nitrogen and conduction cooling). Thermal stability has been analyzed by measuring the quench development and propagation. Minimum quench energy values and longitudinal and radial propagation velocities are reported. The influence of different epoxy impregnations and number of turns in the thermal cycling effects and quench behavior has been studied.

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Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velosupporting

confidence: 74%

Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velomentioning

confidence: 53%

Section: B Minimum Quench Energies (Mqe) and Propagation Quench Velomentioning

confidence: 56%

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Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Núñez-Chico

Martínez

Angurel

et al. 2015

IEEE Trans. Appl. Supercond.

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“…This strategy has been used for describing the electro-thermal properties of single coated conductors [52] - [53], stacks of 2G HTS tapes [54], and 2G HTS coils [55], as active elements of the SFCL. For the sake of simplicity, COMSOL also allows the 1D modelling of SFCL, with differences between the theory and experimental measurements of about 20-40% in 2G HTS tapes, decreasing for the case of MgB2/metal conductors [56].…”

Section: Numerical Models and Simulation Methodsmentioning

confidence: 99%

Resistive-Type Superconducting Fault Current Limiters: Concepts, Materials, and Numerical Modeling

Ruiz

Zhang

Coombs

2015

IEEE Trans. Appl. Supercond.

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Abstract-In recent years, major industrialized countries have began to be concerned about the need for developing strategies on the integration and protection of the growing power capacity of renewable source energies, attracting back their interest on the development and understanding of superconducting fault current limiters (SFCL). The reasons for this are simple: a SFCL may offer a rapid, reliable and effective current limitation, with zero impedance during normal operation, and an automatic recovery after the fault. Nowadays, most of the R&D projects have turned towards to the study of the resistive type SFCL due to their potential to be small, and the likely decrease in price of 2G coated conductors. Thus, in this paper we provide an updated review on the state of the art of resistive type SFCL, emphasizing on the different approaches for the numerical modelling of their local physical properties, as well as on the already tested experimental concepts. Comparison between the properties and characteristics of different resistive-type SFCL using different superconducting materials is presented.

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“…By attaching Cu stabilizer to wires, coils can be protected from damages suppressing T HS below safe level. Most works on the quench issues are devoted to protection and stabilization of quenches by the cause (a) [2][3][4][5][6][7][8]. In those works, however, relation between size of defects in HTS of coil wires and amount of the stabilizer is not well studied and criteria for stabilization relating to size of the defects are not clarified.…”

Section: Introductionmentioning

confidence: 99%

Study on stabilization and quench protection of coils wound of HTS coated conductors considering quench origins – Proposal of criteria for stabilization and quench protection

2014

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a b s t r a c tIt has been considered that HTS coils are hard to be quenched because of high quench energy due to high critical temperature and high specific heat of HTS wires. Therefore, attention to quench protection was not much paid. However, HTS coils still have possibility to be quenched during operation by mainly the following two origins, (a) presence of non-recoverable local defects in the conductors and (b) temperature rise of long part of the conductor. Actually, severe quench accidents, such as burning coils, are occurring in various places as scales of HTS increased. Purposes of this paper are to study on behaviors of normal zone and hot spot temperature of wires during quench detect/energy dump sequence and to find criteria for the stability and quench protection. In the paper, criteria are proposed for stability and quench protection of HTS coils. A criterion for the stability is that a coil can be operated stably without a quench against defects in coil windings and that for quench protection is that a coil can be safely protected from damages caused by a quench due to temperature rise of long part of coil wires. The criteria are used as design rules for HTS coils.

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Numerical and Experimental Analysis of Normal Zone Propagation on 2G HTS Wires

Cited by 38 publications

References 9 publications

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Resistive-Type Superconducting Fault Current Limiters: Concepts, Materials, and Numerical Modeling

Study on stabilization and quench protection of coils wound of HTS coated conductors considering quench origins – Proposal of criteria for stabilization and quench protection

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