Electric Circuits
Mostrando 1-12 de 52 artigos, teses e dissertações.
-
1. Protection of Grid Connected Photovoltaic Systems (GCPVS)
ABSTRACT Installations of photovoltaic systems connected or not to the electrical network have become increasingly popular, but it is often carried out by unqualified people using low quality components. The present study aims to describe the methodology adopted for the protection of grid connected photovoltaic systems (GCPVS) and the implications caused by
Braz. arch. biol. technol.. Publicado em: 29/10/2018
-
2. Power amplifier circuits for functional electrical stimulation systems
Abstract Introduction: Functional electrical stimulation (FES) is a technique that has been successfully employed in rehabilitation treatment to mitigate problems after spinal cord injury (SCI). One of the most relevant modules in a typical FES system is the power or output amplifier stage, which is responsible for the application of voltage or current puls
Res. Biomed. Eng.. Publicado em: 2017-06
-
3. Distributed generators performance during short-circuits considering fault ride-through requirements / Desempenho de geradores distribuídos durante curtos-circuitos considerando requisitos de suportabilidade a afundamentos de tensão = : Distributed generators performance during short-circuits considering fault ride-through requirements
The increase of distributed generation penetration in distribution systems not only helps to diversify the electrical matrix but also brings both technical and economic benefits. Yet, it also raises worries related to energy supply reliability. For wind power plants into the medium and high voltage networks there are the grid codes for "Fault Ride-Through" w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
-
4. Aplicação de redes inteligentes nas instalações elétricas residenciais / Application of smart grid in residential electrical installations.
Electricity as an energy resource acquired vital importance in modern society because it allows relatively easily meet the demand for their services. Thus the demand for electricity increases with the evolution of populations who benefit from. The electrical system that produces this input is limited in its ability to available resources for generation, tran
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/04/2012
-
5. Verificação do sincronismo do acoplamento elétrico entre circuitos simulando o comportamento de um sistema mecânico partícula em caixa / Timing verification of the coupling between electric circuits simulating the behavior of a particle in a box system mechanic
A dinâmica de sistemas caóticos é uma área de pesquisa relativamente recente, diretamente relacionada com os campos da engenharia, física e matemática aplicada. A sincronização entre sistemas dinâmicos tem sido um tópico de pesquisa muito freqüente, abrangendo campos desde a mecânica de corpos celestiais até a física dos lasers. Entretanto, a m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/02/2012
-
6. Studying the effect of Building Block Shape on Sierpinski tetrahedron fractal antenna behavior using FDTD-equivalent electric circuits
This research aims to study the effect of the modification in the Building Block Shape (BBS) on the frequency response of Sierpinski three dimensional pre-fractal antenna using conventional circuit analysis. Three different shapes of BBS's are used to build the antenna. The surface current is analyzed and compared for every BBS. A simple model was devised us
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
-
7. Estudo do comportamento elétrico de lâmpadas fluorescentes / Study of the electric behavior of fluorescent lamps
This work presents a broad study of the electrical behavior of compact fluorescent lamps. It includes an analysis of the lamp components and the circuit of the reactor; an analysis of the stability on the operating point of the lamp; a study of static and dynamic characteristics; a development of a mathematical model; simulations and experiments. It is also
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/2011
-
8. Múltiplas representações aplicadas na aprendizagem de circuitos elétricos
A presente pesquisa tem como objetivo investigar e analisar a viabilidade e a potencialidade do desenho em funcionar como uma representação mediadora para solucionar problemas conceituais de aprendizagem e dificuldades de compreensão dos alunos da terceira série do Ensino Médio, por meio de uma sequência didática envolvendo a mudança entre a represen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/11/2010
-
9. Estudo sobre determinação de parâmetros elétricos de geradores síncronos de polos salientes / Study about determination of electric parameters of synchronous generators of salient poles
Synchronous generators are responsible for almost all electric energy produced in the world. Due to its natural application in electric energy generation of low speed type, salient poles synchronous generators are widely used in hidroelectric energy generation, in energy convertion in ships, emergency engine/generator groups or in local generation not linked
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2010
-
10. Localização de faltas em linhas de transmissão de múltiplos terminais a partir de registros oscilográficos sincronizados via transformada wavelet
The electric energy is essential to the development of modern society and its increasing demand in recent years, effect from population and economic growth, becomes the companies more interested in the quality and continuity of supply, factors regulated by ANEEL (Agência Nacional de Energia Elétrica). These factors must be attended when a permanent fault o
Publicado em: 2010
-
11. Comportamiento del tiempo de duración, la frecuencia de los cortocircuitos y la conductividad eléctrica durante el reencendido del arco en la soldadura SMAW (AC) con electrodos E6013
The objective of this work is the valuation of the behavior of short-circuits frequency and duration time and electrical conductivity on arc reigniting in SMAW (Shielded Metal Arc Welding) process with alternate current and E6013 electrodes. The non parametric statistic analysis realize a robust data processing, minimizing the outliers influence and mistakes
Soldagem & Inspeção. Publicado em: 2009-03
-
12. Estudo sobre sistemas de segurança em instalações elétricas automatizadas. / A study about security systems in automatized eletric installations.
This work presents a study of the main security systems used in automatized electric installations, with approach in the physical access control, using biometric technologies. The main characteristics of the security systems applied to the detection and fire combat, to the physical access control, to the internal and external security control, as closed-circ
Publicado em: 2009