Pub Date : 2022-12-01DOI: 10.1590/2179-10742022v21i4268102
L. O. S. Grillo, C. A. C. Wengerkievicz, H. F. Santos, N. Batistela, P. Kuo-Peng, N. Sadowski, T. K. Matsuo, C. Souza, L. M. D. Freitas, R. J. Nascimento
— This paper presents an equipment for monitoring synchronous generators condition through characteristics of the time derivative of the external magnetic field. The developed monitoring methodology allows the identification of established or incipient faults, by detecting changes in the magnetic signature of the synchronous generator. In this methodology, the measurement of signals outside the machine gives this equipment a non-invasive characteristic, allowing its monitoring without interfering or disturbing its operation. The developed system includes the specification of magnetic field sensors, signal measurement and processing equipment, as well as software for analysis and monitoring. The validation of the methodology used in this system was carried out through the analysis of experimental data, presenting efficient results in the detection of electrical and mechanical faults in synchronous generators of an experimental test bench and a hydroelectric power plant. As a result, the commercial specification of this equipment was obtained and two units were implemented in a hydroelectric power plant to monitor 305 MVA synchronous generators.
{"title":"Equipment for Monitoring Synchronous Generators Condition through External Magnetic Field Waveforms","authors":"L. O. S. Grillo, C. A. C. Wengerkievicz, H. F. Santos, N. Batistela, P. Kuo-Peng, N. Sadowski, T. K. Matsuo, C. Souza, L. M. D. Freitas, R. J. Nascimento","doi":"10.1590/2179-10742022v21i4268102","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i4268102","url":null,"abstract":"— This paper presents an equipment for monitoring synchronous generators condition through characteristics of the time derivative of the external magnetic field. The developed monitoring methodology allows the identification of established or incipient faults, by detecting changes in the magnetic signature of the synchronous generator. In this methodology, the measurement of signals outside the machine gives this equipment a non-invasive characteristic, allowing its monitoring without interfering or disturbing its operation. The developed system includes the specification of magnetic field sensors, signal measurement and processing equipment, as well as software for analysis and monitoring. The validation of the methodology used in this system was carried out through the analysis of experimental data, presenting efficient results in the detection of electrical and mechanical faults in synchronous generators of an experimental test bench and a hydroelectric power plant. As a result, the commercial specification of this equipment was obtained and two units were implemented in a hydroelectric power plant to monitor 305 MVA synchronous generators.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49623459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3262024
Ajdin Alihodžić, A. Mujezinović, E. Turajlić, Maja Muftić Dedović
{"title":"Determination of Electric and Magnetic Field Calculation Uncertainty in the Vicinity of Overhead Transmission Lines","authors":"Ajdin Alihodžić, A. Mujezinović, E. Turajlić, Maja Muftić Dedović","doi":"10.1590/2179-10742022v21i3262024","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3262024","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48760663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3262417
J. O. Bandele
{"title":"MGF Methods for Fixed and Gain Saturated Optically Preamplified FSO Links Impaired by Misalignments and Atmospheric Turbulence","authors":"J. O. Bandele","doi":"10.1590/2179-10742022v21i3262417","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3262417","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44037642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3261922
M. J. Duarte, V. P. S. Silva Neto, A. D’assunção
{"title":"A New Miniaturized Low-Profile and Stable Dual-Band FSS with 2.5D Structure for ISM Bands","authors":"M. J. Duarte, V. P. S. Silva Neto, A. D’assunção","doi":"10.1590/2179-10742022v21i3261922","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3261922","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45785430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3261941
B. B. Miranda, J. A. Malagoli, J. Camacho
{"title":"Optimization Techniques and Mathematical Modeling Applied to Reluctance Motors","authors":"B. B. Miranda, J. A. Malagoli, J. Camacho","doi":"10.1590/2179-10742022v21i3261941","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3261941","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41884477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3259333
R. Oliveira, J. S. Nascimento, Daiyuki M. Fujiyoshi, Thiago S. de Lima, A. J. C. Sena
{"title":"A Finite-Difference Time-Domain Formulation for Modeling Air Ionization Breakdown Streamers","authors":"R. Oliveira, J. S. Nascimento, Daiyuki M. Fujiyoshi, Thiago S. de Lima, A. J. C. Sena","doi":"10.1590/2179-10742022v21i3259333","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3259333","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48996216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3264344
E. Akpari, S. Nunoo, F. Deynu, M. W. Apprey
{"title":"Efficient Low-Complexity Optimized Channel Estimating Methods for OFDM-Based Low-Voltage Broadband Power Line Communication Systems","authors":"E. Akpari, S. Nunoo, F. Deynu, M. W. Apprey","doi":"10.1590/2179-10742022v21i3264344","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3264344","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46624218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3261857
Moutaz Albik, F. Abboud, A. Sarhan, A. Alkhoder
{"title":"Design and Implementation of Microwave Dual-Band Pass Interdigital Filter Using an Analytical Approach","authors":"Moutaz Albik, F. Abboud, A. Sarhan, A. Alkhoder","doi":"10.1590/2179-10742022v21i3261857","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3261857","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45099515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-01DOI: 10.1590/2179-10742022v21i3262597
Raoni de Freitas Góis, Gustavo Oliveira Calvalcanti, E. Fontana
{"title":"Prospects for Developing Low-Cost Optical Fiber Sensors for Liquid-Liquid Interface Detection","authors":"Raoni de Freitas Góis, Gustavo Oliveira Calvalcanti, E. Fontana","doi":"10.1590/2179-10742022v21i3262597","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i3262597","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67305373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-01DOI: 10.1590/2179-10742022v21i2259539
B. A. Babu, B. Madhav, K. Srilatha, B. M. S. Sriram, A. Hemanth
{"title":"A Compact Dual-Band Self-Diplexing MIMO Patch Antenna for ISM and X-Band Communications","authors":"B. A. Babu, B. Madhav, K. Srilatha, B. M. S. Sriram, A. Hemanth","doi":"10.1590/2179-10742022v21i2259539","DOIUrl":"https://doi.org/10.1590/2179-10742022v21i2259539","url":null,"abstract":"","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47461590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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