HTS coil with enhanced thermal stability in over-current operation for fast response magnet power application

Kim, Jinsub; Lee, Jeyull; Ko, Tae Kuk

doi:10.1088/0953-2048/28/10/105006

Cited by 8 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…R r is the radial direction resistance that represents contact resistance between turn and turn. The equivalent circuit of insulation HTS coils is shown in figure 3(b) [28]. Compared with no-insulation coils, the radial direction resistance (R r ) of insulation coils is infinite.…”

Section: Equivalent Circuits Of Hts Coilsmentioning

confidence: 99%

A novel AC loss measurement method for HTS coils based on parameter identification

Li¹,

Li²,

Guo³

et al. 2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

In the presence of AC current or AC magnetic field, superconductors will suffer AC loss. The measurement of AC loss is of great significance for applied superconductivity field. There are main three different methods for AC loss measurement. Among them, electrical measurement method is widely researched by different laboratories. The existed electrical measurement method mainly has two shortcomings: difficult to be used in HTS coils with high inductance and only available for periodic current conditions (only obtains average value of AC loss for one or several current periods and cannot obtain AC loss at any instant). In this paper, a novel AC loss measurement method based on parameter identification is proposed to solve the second shortcoming (only available for periodic current conditions). This novel method measures AC loss through identifying HTS coils’ resistance and inductance at any moment, which is completely different from previous measurement methods. The theoretical basis of this novel method mainly contains three parts: equivalent circuit of HTS coils, instantaneous power identification from Poynting theorem and parameter identification based on recursive least squares with fixed forgetting factor (FFRLS). Compared with AC loss measurement results of previous electrical method (integral method), the validity of this novel measurement method is demonstrated. In theory, this novel method can measure AC loss for any current waveform (periodic and aperiodic current), which greatly widens measurement range of previous electrical method. The principle of this novel method and detailed experimental results are discussed and analyzed in this paper.

show abstract

Section: Equivalent Circuits Of Hts Coilsmentioning

confidence: 99%

A novel AC loss measurement method for HTS coils based on parameter identification

Li¹,

Li²,

Guo³

et al. 2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, when addressing the requirements of large-scale scientific * Author to whom any correspondence should be addressed. devices operating at currents of several kiloamperes (kA), the inclusion of an energy storage system [3][4][5][6][7][8][9] becomes imperative. This system serves the purpose of offering energy compensation and mitigating energy fluctuations, as depicted in figure 1.…”

Section: Introductionmentioning

confidence: 99%

High temperature superconducting CORC cable with variable winding angles for low AC loss and high current carrying SMES system

Zheng,

Cheng,

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Owing to the rising demand for enhanced high-current capacity within superconducting magnetic energy storage (SMES) system used in power grids, there is a growing focus on enhancing the current-carrying capability of SMES setups wound with conductor on round core (CORC) cables. However, it is crucial to note that the dissipation of AC losses in CORC cables during rapid charge and discharge cycles can substantially impact the safe operation of SMES. The CORC cable is crafted by spirally winding numerous ReBCO tapes around copper tubes. Even slight alterations in the winding angles of these tapes can result in shifts at current distribution across the ReBCO tapes, thus leading to differences in AC losses. Hence, the primary objective of this paper is to study the effect of varying winding angles of each ReBCO layer on AC loss. The adoption of variable angles results in the reduction of current flowing through the outermost tapes. And the AC losses in the outermost tapes happen to account for the majority of the total AC losses. Through simulations and experiments, it was observed that the AC loss in the CORC cable with variable angles (4 × 12, 25°–40°) was 25% lower than that in the case of fixed angles (3 × 11, 45°). These findings demonstrate a noteworthy downward trajectory in AC losses when variable angles are applied to the CORC cable. These insights hold significant value for the practical application of CORC cables within SMES systems.

show abstract

Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension

Song¹,

Choi²,

Yang³

et al. 2017

Met. Mater. Int.

View full text Add to dashboard Cite

HTS coil with enhanced thermal stability in over-current operation for fast response magnet power application

Cited by 8 publications

References 7 publications

A novel AC loss measurement method for HTS coils based on parameter identification

A novel AC loss measurement method for HTS coils based on parameter identification

High temperature superconducting CORC cable with variable winding angles for low AC loss and high current carrying SMES system

Thermal and electrical properties of thermal-grease-insulated REBCO superconducting coils with respect to winding tension

Contact Info

Product

Resources

About