Dependence of the AC loss on Interval and Stacking Number in $z$ Stacked GdBCO Coated Conductor

2021 ◽  
Vol 71 (2) ◽  
pp. 111-116
Author(s):  
Chan KIM ◽  
Young-kyoung KIM ◽  
Sung-min JEON ◽  
H. C. RI*
Keyword(s):  
Ac Loss ◽  
Coated Conductor

Study of AC Loss Characteristics of HTS-coated Conductor with Magnetic Substrate Using FEM Analysis

2010 ◽  
Vol 24 (1-2) ◽  
pp. 43-48 ◽  
Author(s):  
Daisuke Miyagi ◽  
Satoshi Yamashita ◽  
Norio Takahashi ◽  
Osami Tsukamoto
Keyword(s):  
Fem Analysis ◽  
Ac Loss ◽  
Coated Conductor ◽  
Magnetic Substrate

Simulation of ac loss in Roebel coated conductor cables

2010 ◽  
Vol 23 (11) ◽  
pp. 115018 ◽  
Author(s):  
Francesco Grilli ◽  
Enric Pardo
Keyword(s):  
Ac Loss ◽  
Coated Conductor

Theoretical and Experimental Analysis of AC Loss Characteristic of Bifilar Pancake Coil With Coated Conductor

2008 ◽  
Vol 18 (2) ◽  
pp. 1232-1235 ◽  
Author(s):  
Dong Keun Park ◽  
Joo Seok Bang ◽  
Seong Eun Yang ◽  
Tae Kuk Ko ◽  
Yong Soo Yoon ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Ac Loss ◽  
Coated Conductor ◽  
Pancake Coil ◽  
Loss Characteristic

Ac-loss measurement of a DyBCO-Roebel assembled coated conductor cable (RACC)

2007 ◽  
Vol 463-465 ◽  
pp. 761-765 ◽  
Author(s):  
S. Schuller ◽  
W. Goldacker ◽  
A. Kling ◽  
L. Krempasky ◽  
C. Schmidt
Keyword(s):  
Ac Loss ◽  
Coated Conductor ◽  
Loss Measurement

scholarly journals Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

2021 ◽  
Author(s):  
E Pardo ◽  
M Staines ◽  
Zhenan Jiang ◽  
N Glasson
Keyword(s):  
High Temperature ◽  
High Voltage ◽  
High Temperature Superconductor ◽  
Low Voltage ◽  
Ac Loss ◽  
Power Transformers ◽  
Coated Conductor ◽  
Real Power ◽  
Transformer Design ◽  
Loss Modelling

Power transformers using a high temperature superconductor (HTS) ReBCO coated conductor and liquid nitrogen dielectric have many potential advantages over conventional transformers. The ac loss in the windings complicates the cryogenics and reduces the efficiency, and hence it needs to be predicted in its design, usually by numerical calculations. This article presents detailed modelling of superconducting transformers with Roebel cable in the low-voltage (LV) winding and a high-voltage (HV) winding with more than 1000 turns. First, we model a 1 MVA 11 kV/415 V 3-phase transformer. The Roebel cable solenoid forming the LV winding is also analyzed as a stand-alone coil. Agreement between calculations and experiments of the 1 MVA transformer supports the model validity for a larger tentative 40 MVA 110 kV/11 kV 3-phase transformer design. We found that the ac loss in each winding is much lower when it is inserted in the transformer than as a stand-alone coil. The ac loss in the 1 and 40 MVA transformers is dominated by the LV and HV windings, respectively. Finally, the ratio of total loss over rated power of the 40 MVA transformer is reduced below 40% of that of the 1 MVA transformer. In conclusion, the modelling tool in this work can reliably predict the ac loss in real power applications. This is the Accepted Manuscript version of an article accepted for publication in 'Superconductor Science and Technology'. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/0953-2048/28/11/114008.

scholarly journals Numerical modelling of dynamic resistance in high-temperature superconducting coated-conductor wires

2021 ◽  
Author(s):  
MD Ainslie ◽  
Christopher Bumby ◽  
Zhenan Jiang ◽  
R Toyomoto ◽  
N Amemiya
Keyword(s):  
Magnetic Fields ◽  
Angular Dependence ◽  
Flow Resistance ◽  
Transport Current ◽  
Ac Loss ◽  
Dynamic Resistance ◽  
Coated Conductor ◽  
Superconducting Properties ◽  
Flux Flow ◽  
The Wire

The use of superconducting wire within AC power systems is complicated by the dissipative interactions that occur when a superconductor is exposed to an alternating current and/or magnetic field, giving rise to a superconducting AC loss caused by the motion of vortices within the superconducting material. When a superconductor is exposed to an alternating field whilst carrying a constant DC transport current, a DC electrical resistance can be observed, commonly referred to as ‘dynamic resistance.’ Dynamic resistance is relevant to many potential hightemperature superconducting (HTS) applications and has been identified as critical to understanding the operating mechanism of HTS flux pump devices. In this paper, a 2D numerical model based on the finite-element method and implementing the H-formulation is used to calculate the dynamic resistance and total AC loss in a coated-conductor HTS wire carrying an arbitrary DC transport current and exposed to background AC magnetic fields up to 100 mT. The measured angular dependence of the superconducting properties of the wire are used as input data, and the model is validated using experimental data for magnetic fields perpendicular to the plane of the wire, as well as at angles of 30° and 60° to this axis. The model is used to obtain insights into the characteristics of such dynamic resistance, including its relationship with the applied current and field, the wire’s superconducting properties, the threshold field above which dynamic resistance is generated and the flux-flow resistance that arises when the total driven transport current exceeds the field-dependent critical current, Ic(B), of the wire. It is shown that the dynamic resistance can be mostly determined by the perpendicular field component with subtle differences determined by the angular dependence of the superconducting properties of the wire. The dynamic resistance in parallel fields is essentially negligible until Jc is exceeded and flux-flow resistance occurs.

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