Current Limiter
Mostrando 1-12 de 18 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. Short Circuit and Recovery Time Tests in a helical bifilar R-SFCL module
Abstract Superconducting Fault Current Limiter (SFCL) modules with distinct arrangements have been investigated, seeking design and performance enhancements. In this context, this work aims to propose a design for resistive SFCL (R-SFCL) modules, using RE-Ba-Cu-O high-temperature superconducting tapes (HTS) wound on an alternative support material. An R-SFCL
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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3. Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics
Several reports describing Superconducting Fault Current Limiter (SFCL) containing members of the bismuth or yttrium ceramics were already described. However, none of these included the mercury and samarium cuprates. Consequently, we have conducted a study of a resistive-type superconductor fault current limiter based on Hg0.82Re0.18Ba2Ca2Cu3O8+d samples and
Mat. Res.. Publicado em: 03/06/2014
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4. A study of convective flux schemes for aerospace flows
This paper presents the effects of some convective flux computation schemes on boundary layer and shocked flow solutions. Second-order accurate centered and upwind convective flux computation schemes are discussed. The centered Jameson scheme, plus explicitly added artificial dissipation terms are considered. Three artificial dissipation models, namely a sca
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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5. Single layer cylindrical and helicoidal coil with voids between successive turns electromagnetic field calculation to be used in superconductor current limiter simulator for design purpose
A very accurate mathematical method, named Helicoidal Method, to calculate the flux density vector B produced by the current circulating in the resistive single-phase superconductor electrical current limiter (RSCL) coils, at any point of the its whole space, using the Biot-Savart’s Law is presented in this paper. It is very important to remember that thes
Publicado em: 2011
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6. Single-phase resistive superconductor electrical current limiter
This paper presents the analysis, design, construction and ac test results of low voltage single-phase resistive superconductor electrical current limiters. Two different types of resistive superconductor current limiter are presented: the first one is built with three concentric, cylindrical and helicoidal coils connected in parallel and the second one is b
Publicado em: 2011
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7. Design and test of HTS coils for resistive fault current limiter
This paper presents the design, manufacturing and test results of HTS coils for single-phase resistive current limiters using two different Bi-2223/Ag tapes. Two coils were separately wound on cylindrical G-10 tubes with helical path. One of the coil was wound in a bifilar conductor arrangement aiming at reducing the self-inductance. The maximum flux density
Publicado em: 2011
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8. Fast single layer cylindrical and helicoidal coil with voids between turns electromagnetic field calculation to be used in superconducting current limiter simulator for design purpose
This paper presents a mathematical method to quickly calculate the flux density vector B produced by the current circulating in a resistive single-phase superconducting electrical current limiter (RSCL), at any point of its whole space, using the Biot-Savart’s Law. As the calculation using the exact form of the turns of each coil (single layer cylindrical
Publicado em: 2011
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9. The democracy issue in the within the framework of political theory: the battle between the liberal sham an the emancipatory perspective of marxist tradition / A questão da democracia no quadro da teoria política: a peleja entre os simulacros liberais e a perspectiva emancipatória da tradição marxista.
The social changes caused by the new stage of capitals accumulation, with the expansion of markets logic in increasingly large areas of human life (causing macroeconomic impacts that accentuate poverty, social inequality and economic inequity, causing mass unemployment, impoverishment and social exclusion in both nationally and internationally), faced by the
Publicado em: 2008
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10. Limitador de corrente eletrica monofasico resistivo supercondutor de alta temperatura critica / Single phase resistive high critical temperature superconducting fault current limiter
O crescimento da demanda de energia elétrica nos centros urbanos e industriais tem levado à necessidade de expansão dos sistemas de energia elétrica o que tem causado aumento nos níveis de curto-circuito, atingindo o limite da capacidade dos sistemas de proteção existentes exigindo sua substituição por outros de maior capacidade. Nessa situação ne
Publicado em: 2008
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11. CONTRIBUTIONS TO STUDY OF WIND FARM CONNECTION TO THE UTILITY / CONTRIBUIÇÕES AO ESTUDO DE CONEXÃO DE GERAÇÃO EÓLICA À REDE ELÉTRICA
Distribution systems have not been designed to receive distributed generation (DG) units. The electric energy injection in these systems is safe and reliable if the characteristics regarding of DG interconnection in distribution power systems are considered: (i) Protection; (ii) Stability; (iii) Electric energy market; (iv) Quality of energy. In this work, a
Publicado em: 2007
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12. LIMITADOR ELETRÔNICO DE CORRENTE DE CURTO-CIRCUITO BASEADO EM CIRCUITO RESSONANTE CONTROLADO POR DISPOSITIVOS SEMICONDUTORES DE POTÊNCIA / ELECTRONIC FAULT CURRENT LIMITER BASED ON RESONANT CIRCUIT CONTROLLED BY POWER SEMICONDUCTOR DEVICES
Esta dissertação apresenta estudos sobre um limitador eletrônico de corrente de curto-circuito (FCL - Fault Current Limiter) ressonante controlado por dispositivos semicondutores de potência. Inicialmente são discutidas a operação de duas topologias de circuitos ressonantes ideais como limitadores de corrente de curto-circuito. A análise desses circu
Publicado em: 2006