Electrical and Electronic Engineering, Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment, Numerical Analysis
A Novel Method for Online Diagnostic Analysis of Partial Discharge in Instrument Transformers and Surge Arresters from the Correlation of HFCT and IEC Methods Marcel Antonionni de Andrade Romano, André M. de de Morais, Marcus V.A. Nunes, K. Maresch, L. F. Freitas-Gutierres, et al. Energies, 2024 In this work, a new methodology is proposed for the online and non-invasive extraction of partial discharge (PD) pulses from raw measurement data obtained using a simplified setup. This method enables the creation of sub-windows with optimized size, each containing a single candidate PD pulse. The proposed approach integrates mathematical morphological filtering (MMF) with kurtosis, a first-order Savitzky-Golay smoothing filter, the Otsu method for thresholding, and a specific technique to associate each sub-window with the phase angle of the applied voltage waveform, enabling the construction of phase-resolved PD (PRPD) patterns. The methodology was validated against a commercial PD detection device adhering to the IEC (International Electrotechnical Commission) standard. Experimental results demonstrated that the proposed method, utilizing an off-the-shelf 8-bit resolution data acquisition system and a low-cost high-frequency current transformer (HFCT) sensor, effectively diagnoses and characterizes PD activity in high-voltage equipment, such as surge arresters and instrument transformers, even in noisy environments. It was able to characterize PD activity using only a few cycles of the applied voltage waveform and identify low amplitude PD pulses with low signal-to-noise ratio signals. Other contribution of this work is the diagnosis and fault signature obtained from a real surge arrester (SA) with a nominal voltage of 192 kV, corroborated by destructive disassembly and internal inspection of the tested equipment. This work provides a cost-effective and accurate tool for real-time PD monitoring, which can be embedded in hardware for continuous evaluation of electrical equipment integrity.
A 3D learning tool for a hydroelectric unit Marcos Paulo Alves de Sousa, Manoel Ribeiro Filho, Marcus Vinícius Alves Nunes, Andrey da Costa Lopes Computer Applications in Engineering Education, 2012
Using genetic algorithm to tune PI-controllers for the direct-drive synchronous wind generators Proceedings International Symposium Modern Electric Power Systems Meps 10, 2010
Planned islanding for Brazilian system reliability Rafael R. Londero, Carolina M. Affonso, Marcus V. A. Nunes, Walmir Freitas 2010 IEEE Pes Transmission and Distribution Conference and Exposition Smart Solutions for A Changing World, 2010
Analysis of electromechanical stress in amorphous transformers through computational modeling comparing to IEC 60076-5 standard Cisci 2010 Novena Conferencia Iberoamericana En Sistemas Cibernetica E Informatica 7to Simposium Iberoamericano En Educacion Cibernetica E Informatica Sieci 2010 Memorias, 2010
Article João Paulo Abreu Vieira, Ubiratan Holanda Bezerra, Walter Barra Jr., Marcus Vinicius Alves Nunes, André Cavalcante do Nascimento Controle Y Automacao, 2007
New control to improve the voltage stability of the wind generators in the failure events Series on Energy and Power Systems, 2005
New mathematical models to represent variable speed wind generation systems in transient stability studies 15th Power Systems Computation Conference Pscc 2005, 2005
Influence of the variable speed wind generators in transient stability margin of the conventional generators integrated in electrical grids 2004 IEEE Power Engineering Society General Meeting, 2004
Voltage regulation of an induction generator coupled to a wind turbine using series capacitances Informacion Tecnologica, 2000
RECENT SCHOLAR PUBLICATIONS
An Automated CNN–BiLSTM Pipeline for Online Detection of Partial Discharge Pulses from HFCT Measurements with PRPD-Based Experimental Validation ED De Sousa, MADA Romano, AM De Morais, MVA Nunes, UH Bezerra IEEE Access , 2026 2026
Computer Vision Techniques and Supervised Learning for Partial Discharge Classification-Application in Signals of High Voltage Generators AFM Cardoso, MVA Nunes, R do Nascimento Silva, VVM de Almeida, ... 2025 16th IEEE International Conference on Industry Applications (INDUSCON … , 2025 2025 Citations: 1
Supressão de Ruídos em Sinais Experimentais de Descargas Parciais Utilizando VMD, LMS e Wavelet Combinadas VVM de Almeida, MAA Romano, AFM Cardoso, RN Silva, AM de Morais, ... 2025 16th IEEE International Conference on Industry Applications (INDUSCON … , 2025 2025
AnáLise Da DegradaçãO Interna Em Transformadores Para Instrumentos De 230 Kv Baseada Na MediçãO De Descargas Parciais R do Nascimento Silva, MVA Nunes, AM de Moraes, AFM Cardoso, ... 2025 16th IEEE International Conference on Industry Applications (INDUSCON … , 2025 2025
Treatment of Real Partial Discharge Signals: A Comparative Analysis of Filtering Methods in Non-Invasive Measurements AB da Silva, AM de Morais, CQ Silva, ARA Manito, MADA Romano, ... 2025 16th IEEE International Conference on Industry Applications (INDUSCON … , 2025 2025
Comparative Evaluation of the Performance of Vegetable Insulating Oils in Power Transformers Against the Lightning Impulse Voltage AFM Cardoso, MM Laranjeira, BMA Silva, JRRP Ferreira, MVA Nunes 2025 16th IEEE International Conference on Industry Applications (INDUSCON … , 2025 2025
Performance Evaluation of a Synthetic Ester-Based Insulating Fluid for Power Transformers under Lightning Impulse Stress AFM Cardoso, MM Laranjeira, MPT Fabricius, BMA Silva, JRRP Ferreira, ... 2025 International Symposium on Lightning Protection (XVIII SIPDA), 1-6 , 2025 2025
Advancing substation inspection: The Hilbert–Huang transform approach for partial discharge recognition and assessment LF Freitas-Gutierres, K Maresch, ADN Quatrin, AM Morais, MAA Romano, ... Measurement 247, 116846 , 2025 2025 Citations: 8
Optimizing Complex Variables for Gas Leak Detection and Grid Stability in Integrated Natural Gas and Green Hydrogen Power Systems H Costa, D Fortunato, F Von Zuben, D Costa, M Nunes International Congress on Information and Communication Technology, 457-469 , 2025 2025
Técnicas de Redução de Ruídos em Medições Não-Invasivas de Descargas Parciais utilizando Diferentes Filtros e Transformada Wavelet AB da Silva, MAA Romano, VVM de Almeida, ARA Manito, AM de Morais, ... Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024
Poluição em Isoladores Elétricos de Alta Tensão: uma Revisão sobre Metodologias de Avaliação e Medidas Mitigadoras RN Silva, MVA Nunes, ARA Manito, AM de Morais, MAA Romano, ... Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024
Aplicação de método de reconstrução de sinais sintéticos de descargas parciais baseado em Decomposição Variacional de Modos com a presença de ruído de quantização VVM de Almeida, MA de Andrade Romano, AM de Morais, MVA Nunes, ... Congresso Brasileiro de Automática-CBA 4 (1) , 2024 2024 Citations: 1
Comparative Analysis of Machine Learning Techniques for Identifying Multiple Force Systems from Accelerometer Measurements GS Pinheiro, FAN Setúbal, SSC Filho, ALA Mesquita, MVA Nunes Sensors 24 (20), 6675 , 2024 2024
A novel method for online diagnostic analysis of partial discharge in instrument transformers and surge arresters from the correlation of HFCT and IEC methods MAA Romano, AM de Morais, MVA Nunes, K Maresch, ... Energies 17 (19), 4921 , 2024 2024 Citations: 7
Framework for decision-making in preventive maintenance: Electric field analysis and partial discharge diagnosis of high-voltage insulators LF Freitas-Gutierres, K Maresch, AM Morais, MVA Nunes, CH Correa, ... Electric Power Systems Research 233, 110447 , 2024 2024 Citations: 15
Innovative approach for detecting early-stage partial discharges in instrument transformers via ultrasound and random forest analysis K Maresch, LF Freitas-Gutierres, G Cardoso Jr, AS Borin, JS Damiani, ... Measurement 232, 114710 , 2024 2024 Citations: 9
Particle swarm optimization of electric power generation via green hydrogen considering the performance of the electrolyzer cell DCL Costa, MVA Nunes, RAP Júnior, J de Souza Soares, TP de Freitas, ... Caderno Pedagógico 21 (4), e3965-e3965 , 2024 2024
Mitigation of insulator lightning-induced voltages by installing parallel low-voltage surge arresters AM de Morais, RMS de Oliveira, MVA Nunes Energies 16 (3), 1111 , 2023 2023 Citations: 5
Mitigation of Insulator Lightning-Induced Voltages by Installing Par-allel Low-Voltage Surge Arresters. Energies 2023, 16, 1111 AM de Morais, RMS de Oliveira, MVA Nunes 2023
Análise de desempenho de para-raios de ZnO sob diversos cenários de poluição utilizando Método de Elementos Finitos MM Lisboa, JHR Ribeiro, SCC Costa, WM de Assis, FMR Menezes, ... Simpósio Brasileiro de Sistemas Elétricos-SBSE 2 (1) , 2022 2022
MOST CITED SCHOLAR PUBLICATIONS
Influence of the variable-speed wind generators in transient stability margin of the conventional generators integrated in electrical grids MVA Nunes, JAP Lopes, HH Zurn, UH Bezerra, RG Almeida IEEE transactions on Energy Conversion 19 (4), 692-701 , 2004 2004 Citations: 434
Consolidating learning in power systems: Virtual reality applied to the study of the operation of electric power transformers PNA Barata, M Ribeiro Filho, MVA Nunes IEEE Transactions on Education 58 (4), 255-261 , 2015 2015 Citations: 77
Designing optimal controllers for doubly fed induction generators using a genetic algorithm JPA Vieira, MVA Nunes, UH Bezerra, AC Do Nascimento IET Generation, Transmission & Distribution 3 (5), 472-484 , 2009 2009 Citations: 73
Analysis of structural behavior of transformer's winding under inrush current conditions WS Fonseca, DS Lima, AKF Lima, MVA Nunes, UH Bezerra, NS Soeiro IEEE Transactions on Industry Applications 54 (3), 2285-2294 , 2018 2018 Citations: 52
Avaliação do comportamento de aerogeradores de velocidde fixa e variável integrados em redes elétricas fracas MVA Nunes Florianópolis, SC , 2003 2003 Citations: 44
Maintenance and operation of a hydroelectric unit of energy in a power system using virtual reality MPA De Sousa, M Ribeiro Filho, MVA Nunes, A da Costa Lopes International Journal of Electrical Power & Energy Systems 32 (6), 599-606 , 2010 2010 Citations: 41
Simultaneous fault section estimation and protective device failure detection using percentage values of the protective devices alarms WA dos Santos Fonseca, UH Bezerra, MVA Nunes, FGN Barros, ... IEEE transactions on Power Systems 28 (1), 170-180 , 2012 2012 Citations: 40
A new solution to the economical load dispatch of power plants and optimization using differential evolution MHR Nascimento, MVA Nunes, JLM Rodríguez, JC Leite Electrical Engineering 99 (2), 561-571 , 2017 2017 Citations: 39
Analysis of VFTO during the failure of a 550-kV gas-insulated substation DC Moreira, MVA Nunes, DDC Moreira, DKD Costa Electric Power Systems Research 189, 106825 , 2020 2020 Citations: 38
Decision tree-based security dispatch application in integrated electric power and natural-gas networks DCL Costa, MVA Nunes, JPA Vieira, UH Bezerra Electric Power Systems Research 141, 442-449 , 2016 2016 Citations: 37
Impact of distributed generation in steady state, voltage and transient stability—Real case RR Londero, CM Affonso, MVA Nunes 2009 IEEE Bucharest PowerTech, 1-6 , 2009 2009 Citations: 34
Transient stability margin of variable versus fixed speed wind systems in electrical grids MVA Nunes, UH Bezerra, HH Zurn 2003 IEEE Bologna Power Tech Conference Proceedings, 3, 7 pp. Vol. 3 , 2003 2003 Citations: 33
Technical and non‐technical losses calculation in distribution grids using a defined equivalent operational impedance ARA Manito, UH Bezerra, TM Soares, JPA Vieira, MVA Nunes, ... IET Generation, Transmission & Distribution 13 (8), 1315-1323 , 2019 2019 Citations: 30
Methodology for analysis of electric distribution network criticality due to direct lightning discharges RPS Barradas, GVS Rocha, JRS Muniz, UH Bezerra, MVA Nunes, ... Energies 13 (7), 1580 , 2020 2020 Citations: 26
Solution to economic emission load dispatch by simulated annealing: case study JAB Júnior, MVA Nunes, MHR Nascimento, JLM Rodríguez, JC Leite Electrical Engineering 100 (2), 749-761 , 2018 2018 Citations: 25
Analysis of electromagnetic-mechanical stresses on the winding of a transformer under inrush currents conditions W da S. Fonseca, D de S. Lima, AKF Lima, NS Soeiro, MVA Nunes International Journal of Applied Electromagnetics and Mechanics 50 (4), 511-524 , 2016 2016 Citations: 25
A 3D learning tool for a hydroelectric unit MPA de Sousa, MR Filho, MVA Nunes, AC Lopes Computer Applications in Engineering Education 20 (2), 269-279 , 2012 2012 Citations: 24
Compression of electrical power signals from waveform records using genetic algorithm and artificial neural network FGN Barros, WA dos Santos Fonseca, UH Bezerra, MVA Nunes Electric Power Systems Research 142, 207-214 , 2017 2017 Citations: 22
Planned islanding for Brazilian system reliability RR Londero, CM Affonso, MVA Nunes, W Freitas IEEE PES T&D 2010, 1-6 , 2010 2010 Citations: 20
Novas estratégias de controle fuzzy aplicadas ao conversor do DFIG para melhoria da estabilidade transitória em sistemas eólicos JPA Vieira, MVA Nunes, UH Bezerra, W Barra Jr IEEE Latin America Trans 5 (3), 143-150 , 2007 2007 Citations: 16