Electromagnetic-thermal modeling of high-temperature superconducting coils with homogenized method and different formulations: a benchmark A Dadhich, F Grilli, L Denis, B Vanderheyden, C Geuzaine, et al. Superconductor Science and Technology, 2024 High-temperature superconducting coils are used in various large-scale applications, like rotating machines and high-field magnets. However, modeling these coils is a complicated and time-consuming process, especially due to the non-linearity of the current–voltage characteristics of the superconductors and the complex multiphysics involved. In this work, we used a fast homogenized method to model the coupled electromagnetic and electrothermal properties of racetrack and pancake coils for different applications. For this purpose, various formulations wielding homogenization methods are used and benchmarked with each other, as well as with models considering the detailed structure of the HTS tapes. We observe a very good agreement between different models (homogenized and detailed), and we discuss the pros and cons of the inclusion of insulating layers between the turns in homogenization. This work was performed under the collaboration of the COST action modeling teams and can be used as a review of the state-of-the-art superconductor modeling techniques, and a source for the development and benchmark of future numerical methods.
Development of a Hybrid Fault Current Limiter André T. Queiroz, Alexandre A. Bitencourt, Cauê S. C. Nogueira, Flávio G. R. Martins, Fernando J. M. D., et al. IEEE Transactions on Applied Superconductivity, 2024
Monitoring and Diagnostic System for Dry-Type Transformers Using Machine Learning Techniques F. G. R. Martins, Y. Lopes, B. W. França, V. H. Ferreira, G. G. Sotelo, et al. Offshore Technology Conference Brasil Otcb 2023, 2023 Power transformers are recognized as high-value assets in substation design, but their susceptibility to various failure modes poses a significant risk of damage and power supply disruptions. Consequently, extensive research has been conducted to develop diagnostic techniques and monitoring methodologies for these devices. This project aims to develop a comprehensive solution comprising hardware and software components for the online diagnosis of dry-type transformers, primarily focusing on the detection of Inter-Turn Short Circuits (ITSC) in conjunction with Partial Discharge (PD) signatures. Dry-type transformers utilize ambient air as both a cooling and insulating medium. Among its advantages, the most relevant for the oil and gas industry are the lower maintenance costs and the absence of flammable oil, ensuring lower fire risks, which is a critical factor in facilities. As offshore electrical plants grow in complexity, there is an increasing demand for dry-type transformers with higher power ratings. Effectively monitoring the operational condition of such transformers serves as a strategic tool to enhance the reliability, robustness and safety of the electrical system, while potentially reducing overall maintenance expenditures. Such transformers offer notable advantages in terms of safety and reliability [1]. However, they come with higher costs and have lower power and voltage limits. Similar to any other equipment, transformers experience aging as a natural consequence of their operation. Its most significant consequence is the gradual degradation of insulation due to thermal effects and mechanical stresses resulting from electromagnetic interactions between windings turns. Additionally, transformers are susceptible to short-circuits, which induce intense electromechanical stresses in the windings, as well as overvoltages stemming from maneuvers such as line energization or the presence of inductive or capacitive loads. These factors elevate the dielectric stress on insulating materials and connections, potentially surpassing their design limits.
Pulsed Magnetization on Jointless Loops Coil Using Multi-Toroidal Auxiliary Winding FG dos Reis Martins, DLS Menezes, BAD da Silva, G dos Santos, ... IEEE Transactions on Applied Superconductivity , 2026 2026
Simulation of DC MRI Coils Using 2G HTS Tapes by the JA Formulation RN De Souza, BMO Santos, G dos Santos, FGR Martins, GG Sotelo IEEE Transactions on Applied Superconductivity 36 (3), 1-5 , 2025 2025
Electromagnetic-thermal modeling of high-temperature superconducting coils with homogenized method and different formulations: a benchmark A Dadhich, F Grilli, L Denis, B Vanderheyden, C Geuzaine, F Trillaud, ... Superconductor Science and Technology 37 (12), 125006 , 2024 2024 Citations: 18
Simulation Methodology of Dry-Type Transformers for Diagnosing their Operational State N Marília, M Caruso, FGR Martins, GG Sotelo, BW França Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024
Sistema Preditivo para Diagnóstico de Transformadores a Seco Baseado em Escala de Degradaçao de Isolamento M Caruso, ALFN de Souza, N Marília, CSC Nogueira, FGR Martins, ... Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024
Análise Computacional da Eficiência de um Indutor Supercondutor em um Conversor do Tipo Boost R de Souza Lima, G dos Santos, BMO Santos, FG dos Reis Martins, ... Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024
Electrothermal modeling of HTS coils using homogenization and different formulations A Dadhich, E Pardo, F Grilli, F Trillaud, D Sotnikov, T Salmi, G Hajiri, ... 9th International Workshop on Numerical Modelling of High Temperature … , 2024 2024
Development of a hybrid fault current limiter AT Queiroz, AA Bitencourt, CSC Nogueira, FGR Martins, F JMD, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024 Citations: 15
Vertical and horizontal force measurements of a double crossed loop FGR Martins, G dos Santos, BMO Santos, F Sass, E Rodriguez, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024 Citations: 6
Use of the JA approach to model homogenized 2G tape stacks and HTS bulks BMO Santos, G dos Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024 Citations: 7
Monitoring and Diagnostic System for Dry-Type Transformers Using Machine Learning Techniques FGR Martins, Y Lopes, BW França, VH Ferreira, GG Sotelo, AA Augusto, ... Offshore Technology Conference Brasil, D031S041R007 , 2023 2023 Citations: 1
Magnetic bearings with double crossed loops modelled with TA formulation and electric circuits BMO Santos, G dos Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... Superconductivity 7, 100058 , 2023 2023 Citations: 21
Analysis of Partial Discharge Behavior within a Spherical Cavity in a High Voltage Form-Wound Stator Coil FR Silva, RS Ferreira, FGR Martins, DHN Dias 2023 IEEE Electrical Insulation Conference (EIC), 1-10 , 2023 2023 Citations: 1
JA formulation: A finite element methodology for simulating superconducting devices G dos Santos, BMO Santos, F Sass, FG dos Reis Martins, GG Sotelo, ... Superconductivity 6, 100049 , 2023 2023 Citations: 50
Simulação de Transitórios Eletromagnéticos em uma Rede Real com a Aplicação de um Limitador de Corrente de Curto-Circuito Supercondutor Resistivo YRD Rangel, AT Queiroz, FGR Martins, DHN Dias, GG Sotelo Simpósio Brasileiro de Sistemas Elétricos-SBSE 2 (1) , 2022 2022 Citations: 1
A Regulação Brasileira de Geração Distribuída Aplicada em Diferentes Estados e Distribuidoras MT Santos, RL Mattos, NMXD Laport, MZ Fortes, FGR Martins Simpósio Brasileiro de Sistemas Elétricos-SBSE 2 (1) , 2022 2022
A 3-D finite-element method approach for analyzing different short circuit types in a saturated iron core fault current limiter G dos Santos, FGR Martins, F Sass, GG Sotelo, A Morandi, F Grilli IEEE Transactions on Applied Superconductivity 32 (3), 1-13 , 2022 2022 Citations: 22
An integrated methodology to assess AC losses in the kHz range using the FEM and partial element equivalent circuit G dos Santos, BMO Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 32 (2), 1-8 , 2021 2021 Citations: 24
HTS Coated conductor losses model using the coupling method and the TA formulation G dos Santos, BM de Oliveira Santos, F Martins, F Sass, G Sotelo, ... 7th International Workshop on Numerical Modelling of High Temperature … , 2021 2021
Tests and recovery under load simulations of a novel bifilar resistive SFCL having undulated shape configuration G Dos Santos, A Bitencourt, AT Queiroz, FGR Martins, F Sass, DHN Dias, ... Superconductor Science and Technology 34 (4), 045009 , 2021 2021 Citations: 26
MOST CITED SCHOLAR PUBLICATIONS
JA formulation: A finite element methodology for simulating superconducting devices G dos Santos, BMO Santos, F Sass, FG dos Reis Martins, GG Sotelo, ... Superconductivity 6, 100049 , 2023 2023.0 Citations: 50
Spark plasma sintering of bulk MgB 2 and levitation force measurements JG Noudem, P Bernstein, L Dupont, FGR Martin, GG Sotelo, DHN Dias, ... Superconductor Science and Technology 33 (2), 024001 , 2020 2020.0 Citations: 28
Tests and recovery under load simulations of a novel bifilar resistive SFCL having undulated shape configuration G Dos Santos, A Bitencourt, AT Queiroz, FGR Martins, F Sass, DHN Dias, ... Superconductor Science and Technology 34 (4), 045009 , 2021 2021.0 Citations: 26
A coupling method of the superconducting devices modeled by finite element method with the lumped parameters electrical circuit G Dos Santos, FGR Martins, F Sass, DHN Dias, GG Sotelo, A Morandi Superconductor Science and Technology 34 (4), 045014 , 2021 2021.0 Citations: 26
An integrated methodology to assess AC losses in the kHz range using the FEM and partial element equivalent circuit G dos Santos, BMO Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 32 (2), 1-8 , 2021 2021.0 Citations: 24
A novel magnetic bearing using REBCO double crossed loop coils FGR Martins, F Sass, AC Ferreira, R de Andrade IEEE Transactions on Applied Superconductivity 28 (4), 1-5 , 2018 2018.0 Citations: 24
A 3-D finite-element method approach for analyzing different short circuit types in a saturated iron core fault current limiter G dos Santos, FGR Martins, F Sass, GG Sotelo, A Morandi, F Grilli IEEE Transactions on Applied Superconductivity 32 (3), 1-13 , 2022 2022.0 Citations: 22
Magnetic bearings with double crossed loops modelled with TA formulation and electric circuits BMO Santos, G dos Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... Superconductivity 7, 100058 , 2023 2023.0 Citations: 21
Electromagnetic-thermal modeling of high-temperature superconducting coils with homogenized method and different formulations: a benchmark A Dadhich, F Grilli, L Denis, B Vanderheyden, C Geuzaine, F Trillaud, ... Superconductor Science and Technology 37 (12), 125006 , 2024 2024.0 Citations: 18
Development of a hybrid fault current limiter AT Queiroz, AA Bitencourt, CSC Nogueira, FGR Martins, F JMD, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024.0 Citations: 15
Project of a HTS synchronous machine emulated by a linear motor FGR Martins, DHN Dias, AC Ferreira, R de Andrade IEEE Transactions on Applied Superconductivity 25 (3), 1-5 , 2014 2014.0 Citations: 15
A Novel Configuration for Resistive SFCL with bifilar 2G tapes GG Sotelo, G dos Santos, FGR Martins, F Sass, LMM Rocha, ... Journal of Physics: Conference Series 1559 (1), 012098 , 2020 2020.0 Citations: 13
Using the integral equations method to model a 2G racetrack coil with anisotropic critical current dependence FGR Martins, F Sass, P Barusco, AC Ferreira, R de Andrade Jr Superconductor Science and Technology 30 (11), 115009 , 2017 2017.0 Citations: 10
Projeto MagLev Cobra-levitação supercondutora para transporte urbano WTB de Sousa, RM Stephan, FS Costa, EF Rodriguez, FGR Martins, ... Revista Brasileira de Ensino de Física 38, e4308 , 2016 2016.0 Citations: 10
Simulations of REBCO tape jointless double crossed loop coils with an integral equations method FGR Martins, F Sass, R de Andrade Jr Superconductor Science and Technology 32 (4), 044002 , 2019 2019.0 Citations: 9
Use of the JA approach to model homogenized 2G tape stacks and HTS bulks BMO Santos, G dos Santos, FG dos Reis Martins, F Sass, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024.0 Citations: 7
Vertical and horizontal force measurements of a double crossed loop FGR Martins, G dos Santos, BMO Santos, F Sass, E Rodriguez, GG Sotelo, ... IEEE Transactions on Applied Superconductivity 34 (3), 1-5 , 2024 2024.0 Citations: 6
A model for calculating losses in transformer related to orders and harmonic amplitude under analysis of joule effect, eddy current and hysteresis G Santos, BM Laurindo, MZ Fortes, BW França, FGR Martins International Journal of Emerging Electric Power Systems 21 (4), 20200006 , 2020 2020.0 Citations: 5
Oclusión y equilibrio de los dientes, clasificación de las maloclusiónes V Ferreira, F Martins Ferreira V, Hecht M. Ortodoncia diagnóstico y planificación clínica 1, 74-114 , 0 Citations: 5
Monitoring and Diagnostic System for Dry-Type Transformers Using Machine Learning Techniques FGR Martins, Y Lopes, BW França, VH Ferreira, GG Sotelo, AA Augusto, ... Offshore Technology Conference Brasil, D031S041R007 , 2023 2023.0 Citations: 1