The study on improving the self-protection ability of HTS coils by removing the insulation and lamination of the various metal tapes

Kim, S.B.; Kaneko, Toru; Saito, Akio; Kajikawa, Hiroshi; Joo, Jin-Hong; Jo, Jeong-Min; Han, Young Jae; Jeong, Hyun-Seung

doi:10.1016/j.physc.2012.03.064

Cited by 13 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bending deformation causes a compressive strain, the pre-tension force results in a tensile strain, and the contact force is proportional to the winding pre-tension force. Therefore, combining equations ( 9) and (10) indicates that the greater the contact force in the area, the larger the tensile axial strain, but the overall level of axial strain decreases within this practical range of stress.…”

Section: Corc Cabling Processmentioning

confidence: 99%

“…The mechanical properties of pancake coils and CORC cables are related to the initial contact during winding [7,8]. The interlayer contact resistance is also a critical electrical property, which determines the ability of current sharing [9][10][11][12], the generation of AC loss [12,13] and the quench protection method [14,15]. Therefore, it is essential to study the contact behavior during the winding process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear contact behavior of HTS tapes during pancake coiling and CORC cabling

Wang

Gao

Luo

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Both the pancake coiling and conductor on round core (CORC) cabling processes consist of winding second-generation high-temperature superconducting tape (REBCO) in a core. The contact behavior between the tape and the core during the winding process directly affects the critical current, cable flexibility, mechanical support and electrical contact resistance. Therefore, the winding process needs to be optimized to produce pancake coils and CORC cables with the desired electrical and mechanical properties. This paper comprehensively considers the role of the relaxation and Poisson effects. The theoretical model and the finite element model (FEM) for calculating the contact stress during the winding process are established, and a formula for the estimation of the contact force is proposed. The suitable winding pre-tension force, winding curvature radius of SCS2030 (2 mm width and 30 μ m substrate thickness) and SCS4050 (4 mm width and 50 μ m substrate thickness) of REBCO tapes are obtained and discussed by accounting for the relaxation effect and the critical current degradation limit. With consideration of the Poisson effect, the nonlinear contact behavior is investigated. In addition, the relaxation effect, Poisson effect and plasticity of the REBCO tape are taken into account in the FEM model. The results show that the axial strain in the REBCO layer during the winding process is related to the contact behavior. The greater the winding pre-tension force, the smaller the helical curvature radius, and the greater the contact force. The distribution of contact stress for several winding factors (winding pre-tension force, winding angle and the core radius) is divided into three contact types: the single-line contact, the double-line contact and the surface contact. The FEM model results are consistent with the theoretical evaluation and are more suitable for practical winding cases. This research is the basis for designing and optimizing pancake coils and CORC cables.

show abstract

Section: Corc Cabling Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear contact behavior of HTS tapes during pancake coiling and CORC cabling

Wang

Gao

Luo

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…If copper is inserted into a coil, then the minimum quench energy (MQE) and the selfprotection ability can be improved. When quench takes place at the coil, improvement of MQE is relevant to the stability of the coil [10].…”

Section: Introductionmentioning

confidence: 99%

The effects of co-wound Kapton, stainless steel and copper, in comparison with no insulation, on the time constant and stability of GdBCO pancake coils

Lee¹,

Hwang²,

Lee³

et al. 2014

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Recently, studies of partially insulated, high-temperature superconducting (HTS) coils have shown application in the design and construction of compact, stable and self-protecting HTS coils. This article presents the electrical characteristics of HTS coils based on the turn-to-turn inserted materials and conditions. Three partially co-wound pancake coils were fabricated and tested. Each coil was partially co-wound with Kapton, stainless steel and copper tape at every fourth turn of the winding. Tested coils were co-wound on every turn with Kapton, stainless steel and copper tape, and coils without turn-to-turn insulation were the control group. Chargedischarge, sudden-discharge and over-current tests were performed to evaluate the performance of the fabricated coils. The experimental results show that the properties of materials inserted into the coil can control the time constant (τ). Therefore, HTS coils can be designed for specific purposes according to the time constant control. The experimental results of the study could be useful in designing HTS coil applications.

show abstract

Modeling and numerical analysis of resistance network for non-insulated superconducting magnet

Bai

Chen

et al. 2014

Cryogenics

View full text Add to dashboard Cite

The study on improving the self-protection ability of HTS coils by removing the insulation and lamination of the various metal tapes

Cited by 13 publications

References 6 publications

Nonlinear contact behavior of HTS tapes during pancake coiling and CORC cabling

Nonlinear contact behavior of HTS tapes during pancake coiling and CORC cabling

The effects of co-wound Kapton, stainless steel and copper, in comparison with no insulation, on the time constant and stability of GdBCO pancake coils

Modeling and numerical analysis of resistance network for non-insulated superconducting magnet

Contact Info

Product

Resources

About