Computational and experimental study of air-core HTS transformer electrothermal behaviour at current limiting mode

Manusov, V.Z.; Kriukov, D. O.; Semenov, Arseniy V.

doi:10.11591/ijece.v11i1.pp155-162

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…From the perspective of insulation operating life, the windings and solid insulating materials of superconducting transformers operate at deep low temperatures, and there is no insulation aging problem. [3,4]. In an emergency, a superconducting transformer can carry the load originally supplied by two transformers, which improves the safety of the system.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Zhi

Zhang

Yang

2022

Mobile Information Systems

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High-temperature superconducting transformers are an important research topic of superconducting technology in power applications, and electromagnetic field analysis and optimization are the basis for the design and application of high-temperature superconducting transformers. The electromagnetic field analysis of high-temperature superconducting transformers should consider the superconducting properties of the materials, that is, the properties of critical current and magnetic field. This paper aims to study the electromagnetic field analysis and optimization method of high-temperature superconducting transformer under the influence of abnormal voltage. Due to the energy loss of high-temperature superconducting transformers, in order to study the economy and reliability of high-temperature superconducting transformers, in this paper, the core loss, winding AC loss, and coil power consumption of high-temperature superconducting transformers are analyzed under normal operation and short-circuit fault conditions, respectively. The power and stress on the windings are analyzed. In order to take into account the current-carrying capacity, short-circuit loss, and short-circuit electromotive force of superconducting windings in normal operation, a concentrically placed double-cake coil structure is selected in this paper, and according to different optimization objectives, a global optimization method is used to evaluate the structure of the coil. The structural parameters of the high-temperature superconducting transformer are optimized, including the structural parameters of the magnetic conducting ring. It is found that that abnormal voltage will affect the electromagnetic field of high-temperature superconducting transformers, including winding circulating current, leakage magnetic field, and current distribution.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Zhi

Zhang

Yang

2022

Mobile Information Systems

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“…Assume the temperature difference between the winding and the cryomedium is large (about 30 K). In that case, liquid nitrogen can transfer to the film boiling mode, which results in minimal heat removal from the winding Figure 5 [22]. This mode of nitrogen boiling is unacceptable since it can lead to a thermal failure of the winding, which can only be prevented by a forced transformer shutdown.…”

Section: Critical Parameters Of a Superconductor And The Current Limi...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

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<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>

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“…1, October 2021: 37 -49 38 magnetizing inrush current [14], converting three-phase to seven-phase waveforms [15], successfully. However, these built-in models or blocks has a limited ability to adopt certain changes needed for particular tests [16]- [18], simulate unbalanced operating conditions [19], analyse the transient behaviour [20]. Also, the built-in blocks are not suited to model special types of electrical machines [21] or to represent specific physical characteristics of electrical machines [22].…”

Section: Introductionmentioning

confidence: 99%

Detailed modelling and simulation of single-phase transformers for research and educational purposes

Sami

Muhssin²,

Obaid

et al. 2021

IJEECS

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<span>COVID-19 pandemic, despite its devastating impact, accelerated the shift to e-learning in higher education. Particularly in the electrical machines courses, that often include laboratory experiments. However, no detailed models of transformers, developed in Simulink/MATLAB®, were reported in the literature. Hence, in this paper, a virtual laboratory consists of models of single-phase transformers was built for the first time. The proposed models are easy to use and modify, and allow all machines’ parameters to be altered for students to replicate easily to support and enhance the learning process of electrical machines courses. Consequently, the developed models are effective tools for educational and research purposes. Dynamic models of single-phase, two-winding, transformers and step-up and step-down auto-transformers were developed using Simulink/MATLAB®. Two different approaches for modelling were proposed, the block diagram representation and Simscape based models. The two modelling methods were validated against the built-in transformer model. The developed models have been successfully integrated into electrical engineering courses at Middle Technical University, Baghdad, Iraq. Therefore, all developed models are freely available online at a dedicated repository.</span>

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Computational and experimental study of air-core HTS transformer electrothermal behaviour at current limiting mode

Cited by 3 publications

References 11 publications

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

Electromagnetic Field Analysis and Optimization Method of High-Temperature Superconducting Transformer under the Influence of Abnormal Voltage

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

Detailed modelling and simulation of single-phase transformers for research and educational purposes

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