High-temperature superconducting (HTS) transformer-rectifier flux pump for powering no-insulation superconducting magnet with low characteristic resistance

Ma, Jun; Geng, Jianzhao; Gawith, James; Coombs, Tim

doi:10.1016/j.physc.2019.01.013

Cited by 17 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the applications of dynamic resistance such as persistent current switches [7][8][9][10] and flux pumps [11][12][13][14][15][16][17][18][19][20][21][22], losses are a very important issue. It would be desirable to know the sources of the losses and to minimize them.…”

Section: Loss Analysismentioning

confidence: 99%

“…The DC voltage arises from the interaction between the transport DC current and moving magnetic fluxons within the superconductor, which is a modulation of the vortex spatial distribution [4]. Dynamic resistance is very useful and is utilized as a key mechanism in persistent current switches [7][8][9][10] and HTS flux pumps [11][12][13][14][15][16][17][18][19][20][21][22]. It is also very common for a DC carrying coated conductor to work in an external AC magnetic field, such as in HTS motors and generators [23][24][25][26], levitation [27,28], and HTS power cables [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…The impact of the Cu-stabilizer incurred by these multiple effects has been analysed, including on dynamic resistance, dynamic voltage, losses, and the risk of quench of the HTS CC. The work is indicative in designing ac magnetic field controlled persistent current switches [7][8][9][10] and flux pumps [11][12][13][14][15][16][17][18][19][20][21][22], in terms of increasing the off-state resistance, analyzing different sources of losses, minimizing detrimental losses, and enhancing safety and stability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A temperature-dependent multilayer model for direct current carrying HTS coated-conductors under perpendicular AC magnetic fields

Geng

Chan

et al. 2020

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

When a type II superconductor carrying a direct current is subjected to a perpendicular oscillating magnetic field, a direct current (DC) voltage will appear. This voltage can either result from dynamic resistance effect or from flux flow effect, or both. The temperature variation in the superconductor plays an important role in the nature of the voltage, and there has been little study of this so far. This paper presents and experimentally verifies a 2D temperature-dependent multilayer model of the second generation (2G) high temperature superconducting (HTS) coated conductors (CC), which is based on H-formulation and a general heat transfer equation. The model has coupled the electromagnetic and thermal physics, and it can simulate the behavior of 2G HTS coated conductors in various working conditions where the temperature rise has a significant impact. Representative electromagnetic phenomena such as the dynamic resistance effect and the flux flow effect, and thermal behavior like quench and recovery have been simulated. This thermal-coupled model is a powerful tool to study the thermal-electromagnetic behaviors of 2G HTS coated conductors in different working conditions, especially when the impact of temperature rise is important. This multilayer model is also very useful in analyzing the impact of different layers in the 2G HTS CCs, especially the metal stabilizer layers. It has been proven to be a very powerful tool to help understand more complicated characteristics in the CCs which could not be accurately measured or simulated by previous numerical models. The work is indicative and very useful in designing ac magnetic field controlled persistent current switches and flux pumps, in terms of increasing the off-state resistance, analyzing different sources of losses, minimizing detrimental losses, and enhancing the safety and stability.

show abstract

Section: Loss Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A temperature-dependent multilayer model for direct current carrying HTS coated-conductors under perpendicular AC magnetic fields

Geng

Chan

et al. 2020

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The advantages and disadvantages are the opposite of the "cold" magnetic core. Practical experience from around the world shows that the "warm" magnetic core design is superior [1]- [9], [28], [29]. The cryostat of our experimental transformer was made out of carbon fiber with an intermediate filling of the wall cavity with aerogel.…”

Section: Cryostatmentioning

confidence: 99%

“…In addition, the failure of superconductivity may occur due to the excess of the critical temperature. The short-circuit current is limited in the first half-wave of the sinusoidal current wave-so during the first 0.01 s (that is faster than relay protection devices in mains can react) [28]- [31]. The limiting function allows preventing the negative consequences of short circuits-damage to equipment, disconnection of consumers.…”

Section: Experimental Verification Of the Possibility Of Short-circui...mentioning

confidence: 99%

Methodology for determining the parameters of high-temperature superconducting power transformers with current limiting function

Manusov

Ivanov²,

Semenov³

et al. 2023

IJECE

View full text Add to dashboard Cite

<span lang="EN-US">This paper substantiates a new adaptive method for determining parameters of high-temperature superconducting power transformers with current limiting function. The main focus is the design of current-limiting superconducting windings in the light of new restrictions on current density, magnetic induction, critical current and critical temperature. The presented method considers the nature of alternating current (AC) losses in a superconductor under nominal operating conditions, features of the dielectric medium (liquid nitrogen), as well as the reduced values of the short-circuit voltage (0.5 to 1.5%). The main design features of high-temperature superconducting (HTS) transformers are specified, and a prototype of a three-phase HTS transformer of 63 kVA with a short-circuit current limiting function is developed. It is shown that HTS units have some advantages over conventional transformers: a 90 to 95% active losses reduction, short-circuit current limitation function, explosion and fire safety, a 60% reduction in weight and size, and increased efficiency (up to 99.8%). Experimental studies confirm that the short-circuit current limitation function is safe and efficient. It is demonstrated that during the short-circuit current limitation, significant heat flows occur on the windings, which should not exceed the critical value above which the superconductor could not return to the superconducting state by itself.</span>

show abstract

Investigation and analysis of turn-to-turn contact resistance of a no-insulation YBCO pancake coil under time-varying

Chen

Fang

Geng

et al. 2020

Physica C: Superconductivity and its Applications

View full text Add to dashboard Cite

High-temperature superconducting (HTS) transformer-rectifier flux pump for powering no-insulation superconducting magnet with low characteristic resistance

Cited by 17 publications

References 20 publications

A temperature-dependent multilayer model for direct current carrying HTS coated-conductors under perpendicular AC magnetic fields

A temperature-dependent multilayer model for direct current carrying HTS coated-conductors under perpendicular AC magnetic fields

Methodology for determining the parameters of high-temperature superconducting power transformers with current limiting function

Investigation and analysis of turn-to-turn contact resistance of a no-insulation YBCO pancake coil under time-varying

Contact Info

Product

Resources

About