Voltage Drop
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. Novel Design of a Hybrid Superconducting Fault Current Limiter with Controlled Solid-State Device
Abstract Fault current limiters are essential devices used to protect the power system and its equipment against high levels of fault current, which are growing up due to the increase of new power sources. This paper proposes a novel design of a Hybrid Superconducting Fault Current Limiter (Hybrid SFCL), which is composed basically by thyristors in series wi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Effects of the Photovoltaic Distributed Generation on Electricity Distribution System Voltage - Updated Review
ABSTRACT Concerns about the environment and a growing demand for electricity have led to the intensive search for renewable energy sources. Photovoltaic solar energy, in the form of distributed generation, has shown a very high growth rate to an extent that in some regions it will be adopted on a large scale, thus being responsible for the supply of a signif
Braz. arch. biol. technol.. Publicado em: 22/10/2018
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3. An automatic gain control circuit to improve ECG acquisition
Abstract Introduction Long-term electrocardiogram (ECG) recordings are widely employed to assist the diagnosis of cardiac and sleep disorders. However, variability of ECG amplitude during the recordings hampers the detection of QRS complexes by algorithms. This work presents a simple electronic circuit to automatically normalize the ECG amplitude, improving
Res. Biomed. Eng.. Publicado em: 30/11/2017
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4. Operator Bias in the Estimation of Arc Efficiency in Gas Tungsten Arc Welding
In this paper the operator bias in the measurement process of arc efficiency in stationary direct current electrode negative gas tungsten arc welding is discussed. An experimental study involving 15 operators (enough to reach statistical significance) has been carried out with the purpose to estimate the arc efficiency from a specific procedure for calorimet
Soldag. insp.. Publicado em: 2015-03
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5. Estudo da influência dos parâmetros no processo de soldagem GMAW - arco pulsado
Pulsed gas metal arc welding describes the metal transfer mode involving oscillation (pulsing) of the welding current from a high pulse current in which level drop growth, necking of wire tip and detachment occur, and a low background current, which is applied to maintain the arc. The advantages of the process are: metal transfer without spatter formation an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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6. A modified lightly doped drain structure for vlsi mosfet's
A new n-MOS LDD-like device structure (the J-MOS transistor) is proposed. It’s design, simulation, and fabrication are studied in this paper. n-channel MOSFET’s with Le, below 2µm suffer from high-field effects that must be overcome to secure reliable 5-V operation. LDD structures alleviate these effects, but their reliability is better than that of con
Publicado em: 2011
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7. Modelamento matemático do processo de soldagem GMAW
This thesis describes the development and validation of a mathematical model that describes the electrical and operational behavior of GMA welding. Initially it was developed a static model that was able to simulate welding conditions characterized by small current and tension variation usually found with free-flight metal transfer. Afterwards, a dynamic mod
Publicado em: 2010
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8. Estudo e aplicação de um fluxo de análise de trilha de alimentação / Study and application of a rail analysis flow
Tecnologias sub-100nm têm visto um incremento em questões relativas à confiabilidade e integridade de sinais. O aumento da densidade dos transistores, o aumento da freqüência de operação, a redução das dimensões do chip têm contribuído para o aumento na probabilidade de ocorrência de quedas de tensão e de eletromigração. Quedas de tensão afe
Publicado em: 2010
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9. MÉTODOS PARA OTIMIZAÇÃO DOS AJUSTES DOS REGULADORES DE TENSÃO E ZONAS DE TAP EM SISTEMAS DE DISTRIBUIÇÃO / METHODS FOR OPTIMIZATION OF THE VOLTAGE REGULATORS AND TAP ZONES IN DISTRIBUTION SYSTEMS
The new regulations in the electric sector utilities have have requested greater efficiency and quality both in terms of continuity and in conformity of the energy supplied. Electrical equipments quality, efficiency and useful life depend directly of the power quality supplied. In addition to operation of equipments, supply of energy within the limits must b
Publicado em: 2009
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10. Otimização da metodologia de determinação de molibdênio em solos e plantas por voltametria de onda quadrada com redissolução catódica adsortiva / Optimization of the molybdenum determination in soils and plant methodology by cathodic adsorptive stripping square- wave voltammetry
Molybdenum is an element essential to life that can be found practically in the whole biosphere. It is present in the nitrase enzyme cofactor and is responsible for the reduction of the N2 molecule and its fixation in the terrestrial crust. In other enzymes, molybdenum acts in reactions of transference of atoms of oxygen to a lot of sub-stratums. Molybdenum
Publicado em: 2008
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11. Distribution system FACTS (flexible AC transmission systems) application - performance simulation. / Aplicação do dispositivo FACTS (Flexible AC Transmission Systems) em sistema de distribuição -simulação de desempenho.
The new FACTS technologies applied to the transmission system, based on power electronics, can also be useful to the distribution. For that, it is necessary to drive a procedure to consolidate the use and the performance for their application without risks. In this work two aspects will be approached. The first refers to the application of a FACTS device act
Publicado em: 2006
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12. ANALYSIS OF THE TRUSTWORTHINESS IN NETS OF DISTRIBUTION RADIAL: RECONFIGURATION AND ALOCATION OF DISTRIBUTED GENERATION / Análise da Cconfiabilidade em Redes de Distribuição Radiais: Reconfiguração e Alocação de Geração Distribuída
The distribution utilities must satisfy two concurrent objectives during planning process of the electric network: minimization of the investment cost and the satisfaction of reliability targets. An alternative to satisfy these objectives is to include low cost alternatives in the planning process. One of these alternatives is the reconfiguration of the dist
Publicado em: 2006