Power Losses of 2G HTS Coils Measured in External Magnetic DC and Ripple Fields

Chudý, Michal; Chen, Y.; Zhang, Min; Baghdadi, Mehdi; Lalk, Jörg; Pretorius, Marthinus W.; Coombs, Tim

doi:10.1109/tasc.2013.2291072

Cited by 5 publications

(4 citation statements)

References 32 publications

(26 reference statements)

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“…At the same time, the conductor design is limited by substrate width thickness, filament width and barrier resistivity. In [3], Chudy M et al explored the AC loss of HTS of wind turbine under different DC fields. In [4], M Vojenčiak et al considered the shift of phase between the magnetic field and current, and studied the total energy loss in the special band.…”

Section: Introductionmentioning

confidence: 99%

Research on the AC Loss of Multi-strand Round Conductors

Cai¹

2022

HSET

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Conductors are very common in our life, such as high-voltage cables and all household appliances. The vast majority of conductors, especially home circuits, use alternating current. There will be so-called AC loss in AC circuits, which will limit our design and improvement of electrical appliances. In this paper, the AC loss in the charging conductor is influenced by skin effect and proximity effect. First of all, we will introduce these two effects. Both effects cause energy loss via induction current. Secondly, variables related to energy loss are pointed by using finite element analysis. After modelling and analysis, energy loss depends on frequency, loss increase with increasing frequency. Secondly, among the different arrangements of conductors, the arrangement of hexagons will be more energy-saving. Finally, the degree of energy loss is related to the conductor’s diameter. As the conductor’s diameter increases, the energy loss increases first and then decreases. In the end, energy loss relies on the size of frequency and the arrangement of conductors and the diameter of conductors

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Section: Introductionmentioning

confidence: 99%

Research on the AC Loss of Multi-strand Round Conductors

Cai¹

2022

HSET

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“…In [10], authors studied the effect of harmonic amplitude as well as magnetic field dependency of critical current density on harmonic magnetization loss for ReBCO tapes. In [15], authors explored the AC loss in an HTS coil for wind turbine generators experimentally, under different DC field with AC ripples. In [16]- [17], AC loss in HTS strip under nonsinusoidal current and magnetic field was formulized analytically, only considering harmonic amplitude.…”

Section: Introductionmentioning

confidence: 99%

Magnetization Loss in HTS Coated Conductor Exposed to Harmonic External Magnetic Fields for Superconducting Rotating Machine Applications

et al. 2021

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Previous studies on magnetization AC loss of high temperature superconducting (HTS) coated conductors (CCs) taken into account the ideally sinusoidal external magnetic field, or non-sinusoidal by considering only the harmonics in phase with the fundamental component. However, realistically magnetic field often contains harmonics with different phase angles and amplitudes. In this work, magnetization AC loss in HTS CC was studied, considering the phase angle φ of each harmonic; assuming superconductor is subjected to external magnetic field which is distorted by the 3 rd and the 5 th harmonics. Phase angle of each harmonic was considered in the range of 0 to 2π and amplitude of fundamental magnetic field, was assumed as 10, 20, 50, and 100 mT. Different distortion level of magnetic field was considered too. It is concluded that phase angle of field harmonic has a significant effect on magnetization loss of HTS CCs. INDEX TERMS External magnetic field, Harmonic phase angle, HTS coated conductor, Magnetization AC loss. Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

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“…Thereby the field coil can experience a DC field from the armature coil, eventually. However, in real machines, the field coil inevitably experiences an unbalanced field condition due to armature reactions or non-synchronous mechanical disturbances, leading to power losses that decrease the efficiency of rotating machines [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A study of the electromagnetic characteristics of no-insulation GdBCO racetrack coils under an external magnetic ripple field

Choi¹,

Yang²,

Kim³

et al. 2016

Supercond. Sci. Technol.

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Here we report the effect of an external magnetic ripple field on the electromagnetic characteristics of GdBCO racetrack coils being operated with a constant DC current. Two types of GdBCO racetrack coils, one wound without turn-to-turn insulation (NI) and the other wound with Kapton tape (INS), were examined under external ripple fields generated by a permanent magnet mounted on a rotor, which was driven by a separate AC motor. The voltage fluctuations and magnetic field variations were measured with respect to the external ripple field intensity (BERF), rotating speed, and the operating condition. When the INS and NI coils were exposed to an external ripple field (herein, Iop = 80 A, BERF = 2 mT, and 5 rpm), a voltage fluctuation occurred because a time-varying magnetic field interacted with an electric circuit creating an electromotive force. The peak-to-peak voltage (Vpp = 0.29 mV) of the NI coil was ∼1.86 times lower than that (0.54 mV) of the INS coil, because the voltage response of the NI coil lagged behind dB/dt due to the existence of turn-to-turn contact. Furthermore, the Vpp of the INS coil increased with increasing BERF and rotating speed, while those of the NI coil were barely affected due to the delay of electromagnetic induction. In excessive current and ripple field conditions (Iop = 1.125 Ic, BERF = 8 mT, and 50 rpm) the INS coil eventually quenched while the NI coil did not, implying that the electromagnetic stability of the NI coil in excessive time-varying field conditions was superior to that of the INS coil.

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Power Losses of 2G HTS Coils Measured in External Magnetic DC and Ripple Fields

Cited by 5 publications

References 32 publications

Research on the AC Loss of Multi-strand Round Conductors

Research on the AC Loss of Multi-strand Round Conductors

Magnetization Loss in HTS Coated Conductor Exposed to Harmonic External Magnetic Fields for Superconducting Rotating Machine Applications

A study of the electromagnetic characteristics of no-insulation GdBCO racetrack coils under an external magnetic ripple field

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