Inductance Calculation of HTS Transformers with Multi-segment Windings Considering Insulation Constraints

Moradnouri, Ahmad; Vakilian, Mehdi; Hekmati, Arsalan; Fardmanesh, Mehdi

doi:10.1007/s10948-021-05850-w

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…As the HTS tapes resistance in the HTS transformer is normally negligible, a small imbalance in the inductance of the branches can make the current and magnetic distribution in the branches completely uneven and consequently increase or decrease the AC losses and critical current. On the other hand, the inductance of transformer windings depends on the structural characteristics of the windings, including the radius of the windings (Moradnouri et al , 2021). According to Figure 1, the radius of the windings, in addition to the diameter of the core, depends on other factors such as the inner radius of the cryostat and the thickness of the inner wall of the cryostat, and the distance of the windings from the inner wall of the cryostat and the distance between the HV and LV windings, which can be somewhat variable depending on the design of the HTS transformer.…”

Section: Relationships Numerical Method Simulationmentioning

confidence: 99%

Impact of the radius of double pancake windings on the electromagnetic behavior of high temperature superconducting transformer

Attar

Moradnouri

Mirghaforian

et al. 2022

COMPEL

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Purpose It has constantly been important to investigate the distribution of magnetic fields in high temperature superconducting (HTS) transformers because the high magnetic field applied to the HTS tapes reduces the critical current and increases the ac losses. The purpose of this study is investigation of the impact of the radius of double pancake windings on the electromagnetic behavior of HTS transformer. In this paper, by changing the radius of the windings in a step-by-step manner in two modes, the electromagnetic behaviors in double pancakes (DPs) of a single-phase HTS transformer have been investigated. Design/methodology/approach In this paper a 15.4 kVA single-phase HTS transformer has been designed and simulated using the finite element method, using COMSOL multiphysics software. The effect of changing the radius of the low-voltage (LV) and high-voltage (HV) windings on the electromagnetic parameters such as distribution of circulating currents and magnetic field in the LV DP windings has been investigated. Findings According to the results, by increasing the radius of the LV winding, the electromagnetic behavior of the highest and lowest DPs becomes highly undesirable, while in other DPs, it becomes desirable. The same thing happens by increasing the radius of the LV and HV windings, but with much less intensity. Therefore, according to Ce, the most optimal case is when the two windings (HV and LV) are close to each other and to the core, and if the radius needs to be increased, it is better to increase the radius of both windings. Originality/value For the first time, the impact of the radius of DP windings on the electromagnetic behavior of HTS transformer has been investigated.

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Section: Relationships Numerical Method Simulationmentioning

confidence: 99%

Impact of the radius of double pancake windings on the electromagnetic behavior of high temperature superconducting transformer

Attar

Moradnouri

Mirghaforian

et al. 2022

COMPEL

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“…The use of Glass Fiber-Reinforced Polymers (GFRP) has become widespread in various industries such as shipbuilding, vehicle manufacturing, wind power systems, and pipe production [9].…”

Section: Steel and Gfrp Rebarsmentioning

confidence: 99%

Comparative Life-Cycle Assessment of Steel and GFRP Rebars for Procurement Sustainability in the Construction Industry

Al Omar,

Abdelhadi

2024

Sustainability

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This research examines the potential impact on the procurement sustainability of replacing steel rebars with Glass Fiber-Reinforced Polymer (GFRP) rebars in the construction industry, focusing on screed pre-cast hollow core topping in a project in the Kingdom of Saudi Arabia. A comparative life cycle assessment (LCA) is conducted using One Click LCA (Version 0.26.0) software for cradle-to-grave analysis. The assessment covers various stages, including raw material extraction, manufacturing, transportation, usage, and recycling. The comprehensive LCA highlights GFRP rebars as a more sustainable alternative to steel, emitting 17% less CO2 equivalent (2e) per kilogram throughout its life cycle. Additionally, GFRP requires substantially less mass compared to steel, resulting in a dramatic reduction in CO2e emissions ranging from 77.89% to 85.26% across different spacing configurations in real-world construction scenarios, as presented in this research case study. These findings suggest that GFRP rebars offer a promising solution for reducing the environmental impact of construction activities while potentially yielding significant cost savings over the project’s life cycle. Integrating environmental considerations into material selection processes can prioritize sustainability without compromising performance or safety, contributing to a more sustainable future for the construction industry globally.

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“…This kind of comparison of the conventional and HTS designs is not correct because decreasing the short-circuit impedance can significantly reduce the total cost of ownership in the case of conventional transformers as well [32]. These relatively small leakage inductances result in higher short circuit forces, where the brittleness of the ReBCO materials and the short circuit limiting the capacity of the superconductor cable should be considered [33,34]. Berger et al [35] compared the efficiency and the losses of a 63 MVA HTS transformer.…”

Section: Yearmentioning

confidence: 99%

FEM-Based Power Transformer Model for Superconducting and Conventional Power Transformer Optimization

Orosz

2022

Energies

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There were many promising superconducting materials discovered in the last decades that can significantly increase the efficiency of large power transformers. However, these large machines are generally custom-made and tailored to the given application. During the design process the most economical design should be selected from thousands of applicable solutions in a short design period. Due to the nonlinearity of the task, the cost-optimal transformer design, which has the smallest costs during the transformers’ planned lifetime, is usually not the design with the highest efficiency. Due to the topic’s importance, many simplified transformer models were published in the literature to resolve this problem. However, only a few papers considered this preliminary design optimization problem in the case of superconducting transformers and none of them made a comparison with a validated conventional transformer optimization model. This paper proposes a novel FEM-based two-winding transformer model, which can be used to calculate the main dimension of conventional and superconducting transformer designs. The models are stored in a unified JSON-file format, which can be easily integrated into an evolutionary or genetic algorithm-based optimization. The paper shows the used methods and their accuracy on conventional 10 MVA and superconducting 1.2 MVA transformer designs. Moreover, a simple cost optimization with the 10 MVA transformer was performed for two realistic economic scenarios. The results show that in some cases the cheaper, but less efficient, transformer can be the more economic.

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Inductance Calculation of HTS Transformers with Multi-segment Windings Considering Insulation Constraints

Cited by 5 publications

References 38 publications

Impact of the radius of double pancake windings on the electromagnetic behavior of high temperature superconducting transformer

Impact of the radius of double pancake windings on the electromagnetic behavior of high temperature superconducting transformer

Comparative Life-Cycle Assessment of Steel and GFRP Rebars for Procurement Sustainability in the Construction Industry

FEM-Based Power Transformer Model for Superconducting and Conventional Power Transformer Optimization

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