Power Transmission Lines
Mostrando 1-12 de 73 artigos, teses e dissertações.
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1. Cascade Modeling of the Measuring System Used to Assess S-Parameters of Anchor Rods on Power Transmission Lines Guyed Towers
Abstract The structural condition of the cable-stayed towers anchorage on power transmission lines requires constant monitoring. Maintenance routines must be able to identify faulty anchor rods and substitute them to avoid tower collapses and power delivery interruptions. Modern statistical diagnostic systems based on machine learning requires the generation
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. A Parametric Study of Inductive SWIPT Systems Assisted by Metamaterial Using Virtual Magnetic TL-Based Channel Modeling
Abstract This paper presents a general methodology based on the description of the inductive channel as virtual magnetic transmission-lines (VMGTLs). In comparison with other existing methods, VMGTL approach presents a better physical insight of the channel behavior since the model correctly preserves the energy flow between the transmitting and receiving co
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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3. A Novel Fully Integrated 4-Bit IFM Subsystem Using Band-Stop Filters
Abstract In this paper a 2-4 GHz microstrip IFM (Instantaneous Frequency Measurement) subsystem that uses Wilkinson power dividers, frequency discriminators based on band-stop filters and a DC arduino section is reported. The device uses band-stop filters as an alternative to delay lines, commonly used for IFM. The resonators are responsible for frequency ad
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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4. A Novel Tri-bandpass Filter Side-coupled Square Ring Based
Abstract This work presents the design of a tri-bandpass filter based on the side-coupled square ring structure. The modeling is conceived from the classic approach of coupled transmission lines. The geometry consists of a square structure of electrical length equal to twice the wavelength of the main operating frequency, and the laterally coupled lines thro
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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5. The Smart Grid Concept in Oil & Gas Industries by a Field Trial of Data Communication in MV Power Lines
Abstract Nowadays, communication and networking technologies are essential for Oil & Gas industries in order to guarantee reliability, safety and low costs in the producing process. Information access and commands and set-points transmission from/to automation systems are challenging tasks mainly due to distributed production areas and hostile environments.
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-06
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6. Exposure to 50 Hz electromagnetic field changes the efficiency of the scorpion alpha toxin
AbstractBackground Extremely low-frequency (50 Hz) electromagnetic field (ELF-EMF) is produced by electric power transmission lines and electronic devices of everyday use. Some phenomena are proposed as “first effects” of ELF-EMF: the discrete changes in the membrane potential and the increase of the calcium channel activity as well as the intracellular
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/10/2015
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7. Numerical Simulation of Hot Closed Die Forging of a Low Carbon Steel Coupled with Microstructure Evolution
Hot closed die forging is a regular process applied to manufacture metallic components used in supporting and fixing cable conductors in electric power transmission lines. In this forming process, the final microstructure of the workpiece depends on the control of several processing parameters. In this study, simulation of the industrial forging process of a
Mat. Res.. Publicado em: 2015-02
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8. A proteção de retaguarda para linhas de transmissão aplicando medição fasorial sincronizada / The backup protection for transmission lines applying synchronized phasor measurement
O presente trabalho tem por objetivo o desenvolvimento de uma metodologia para a proteção de retaguarda de um Sistema Elétrico de Potência (SEP) de grande área, através de um Sistema de Medição Fasorial Sincronizado (SMFS). A metodologia é baseada no contínuo monitoramento e na proteção de um SEP de grande área voltada para linhas de transmissã
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/09/2012
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9. O modelo SLIM (\"Self-Consistently Interception Model\") para estimativa da incidência de descargas atmosféricas em estruturas - avaliação e aplicação na análise do desempenho de linhas de transmissão de energia / The Self-consistently Interception Model (SLIM) for estimating the lightning incidence to structures evaluation of the model and application to the analysis of lightning performance of power transmission lines
O desempenho de uma linha de transmissão de energia está diretamente ligado ao número médio anual de descargas que nela incidem, o qual depende da densidade média de descargas ao solo na região e também do grau de exposição da linha. Modelos com diferentes graus de complexidade são encontrados na literatura para a estimativa da área de atração d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2012
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10. Utilização de linhas de transmissão semelhantes no ensaio de energização de um tronco com pouco mais de meio comprimento de onda / Utilization of similar transmission lines on energization test of a trunk with a little more than a half-wavelength
O transporte de grandes blocos de energia elétrica através de longas distâncias que variam de 2500 a 3000 km impõe a utilização de soluções mais adequadas baseadas em linhas de transmissão não convencionais. Uma alternativa em corrente alternada (CA) é a linha com pouco mais de meio comprimento de onda, que para o caso brasileiro, cuja frequência
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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11. SISTEMATIZAÇÃO DE CONHECIMENTO PARA O PROJETO DE PLATAFORMAS DE COLHEITA DE FEIJÃO / KNOWLEDGE SYSTEMATIZATION FOR THE DESIGN OF HARVEST HEADERS OF BEANS
Due to the need to increase in production and to the high rates of losses in the header because of machines with low efficiency in harvesting, it is presented, in this thesis the knowledge systematization needed to develop new header designs to harvest beans. This work presents the machines used for the harvest of beans, the harvesting systems, and a list of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
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12. Um estudo sobre tensões induzidas por descargas atmosféricas em linhas de transmissão
The study of lightning and the resulting induced voltages is very important in the process of designing of transmission lines. In this work it will be presented problems that can be caused by such phenomenon in electrical systems, as a consequence of these voltages peaks. A analysis of the characterization of atmospheric discharge is performed in order to un
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011