Measuring transport AC losses in YBCO-coated conductor coils

Grilli, Francesco; Ashworth, S.P.

doi:10.1088/0953-2048/20/8/013

Cited by 91 publications

(84 citation statements)

References 12 publications

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“…Conducted investigations showed that the return of a winding into the superconducting state after short circuit clearing depends primarily on the ratio between the short circuit current and the rated load current [9][10][11][12][13][14]. In other words, the ratio between the short circuit current and the load current should be a such value that the quantity of heat does not exceed the critical value during a short circuit.…”

Section: Q I T W T T T T T T Ctmentioning

confidence: 99%

A Study of Superconducting Transformer with Short-Circuit Current Limitation

Manusov¹,

Pavlyuchenko²,

Ahyoev³

2018

IJECE

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The paper presents physico-mathematical models for analyzing transient processes in electrical networks having transformers with a high temperature superconducting winding. One of the main purposes of the study is the investigation of the short circuit current limitation process with the use of a transformer with a high temperature superconducting winding, that allows the combination of two series-connected elements, transformer and reactor, in one device. The efficiency of this method for short circuit current limitation is provided by the fact that the critical value of superconducting winding temperature is exceeded under short circuit current flowing, then it passes into the normal state with a high impedance winding, thus limiting a short circuit current. It is important to know the moment when superconducting material passes into the normal state with the loss of superconductivity. For this purpose, the program for calculating the quantity of heat under short circuit current flowing before its interruption was developed. If a 40 MVA transformer with a high temperature superconducting winding is considered, short circuit should be cleared after 100 ms without transformer disconnection. It is proposed to use a hybrid winding in addition to the main winding for short circuit current limitation. Conducted investigations showed that the return of a winding into the superconducting state depends primarily on the ratio between a short circuit current and a rated load current. This represents the criterion for returning or not returning into the superconducting state for transformer windings.

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Section: Q I T W T T T T T T Ctmentioning

confidence: 99%

A Study of Superconducting Transformer with Short-Circuit Current Limitation

Manusov¹,

Pavlyuchenko²,

Ahyoev³

2018

IJECE

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“…Therefore, an approximate 2D axisymmetric model is built for the joint-free coil. The model is based on H-formulation of HTS, whose governing equation is as: [31][32][33][34][35][36][37][38] …”

Section: B Numerical Modelmentioning

confidence: 99%

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

Zheng

Wang

et al. 2017

AIP Advances

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Joint-free (RE)Ba2Cu3Ox (REBCO) coil based on ‘wind-and-flip’ technique has been developed to generate a persistent magnetic field without power supply. This paper is to study the magnetization characteristics of the joint-free REBCO coil by field cooling, in order to trap higher field. A joint-free pancake coil is wound by REBCO tapes and the field cooling magnetization test is performed on it. An approximate numerical model based on H-formulation is built for this coil to analyze its magnetization behavior, which is validated by the experimental results Analysis show that a persistent direct current is induced in the coil during the field cooling operation, which generates the trapped field. The induced current of the joint-free coil shows an intrinsic non-uniform distribution among turns. Increasing the magnetization field and critical current of REBCO conductors can considerably increase the trapped field. But the trapping factor (the rate of trapped field to background magnetization field) reaches a maximum value (60 % for the test coil). This maximum value is an intrinsic characteristics for a fabricated coil, which only depends on the coil’s geometry structure. With a same usage of REBCO tapes, the trapping factor can be improved significantly by optimizing the coil structure to multiple pancakes, and it can approach 100 %.

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“…Ultimately, assess the possibility of applying the superconducting material on electromagnetic levitation. So the primary issue of applying high-temperature superconducting material in maglev system is to study the magnitude of AC loss [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Simulation of YBCO Tape and Coils in HTS Maglev System

Song

2017

MATEC Web Conf.

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Abstract. In the process of running high temperature superconducting maglev train the AC(Alternating Current) loss of superconducting coil is directly related to its safe operation and operating cost. In this paper, the simulation model was built based on the finite element software COMSOL Multiphysics, and mainly simulated and calculated the AC losses of YBCO(Yttrium Barium Copper Oxide) tape and coils. In this model, as the solving object, the singular and infinite long YBCO tape and coils model was solved with H-formulation and the nonlinear characteristic (E-J constitutive law) and anisotrophy (B-J characteristic) were taken into consideration as the theoretical foundation. Then on the basis of the model under maglev suspension system, AC losses under different amplitude and frequence AC currents were calculated. The results shows that under different frequencies and dynamic components, the local maximum AC loss of YBCO tape and coils occurs when the steady-state DC(Direct Current) current is 30A . Then comparing with old maglev suspension system, the new system can greatly reduce the energy consumption and the material cost.

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Measuring transport AC losses in YBCO-coated conductor coils

Cited by 91 publications

References 12 publications

A Study of Superconducting Transformer with Short-Circuit Current Limitation

A Study of Superconducting Transformer with Short-Circuit Current Limitation

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

Simulation of YBCO Tape and Coils in HTS Maglev System

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