XII-5.15.Transformer(2014)

Physics, Class XII Chapter : Alternating current Topic : Transformer, Classroom lecture by Pradeep Kshetrapal. Language : English mixed with Hindi.

Reduction of no-load losses in distribution transformers by using amorphous ribbons Malick MOUHAMAD LME (Laboratoire des Matériels Electriques), Réseau de distribution d'électricité THESE DE DOCTORAT DE L’ECOLE NORMALE SUPERIEURE DE CACHAN

Résumé La présente étude traite l’application des rubans amorphes dans les transformateurs de distribution dans l’objectif de réduire les pertes dans le réseau d’électricité. Les matériaux utilisés sont un alliage à base de fer, silicium et bore. Les premières études sur ce matériau amorphe révèlent une très bonne compatibilité chimique de ces derniers avec les huiles de transformateur. Ces rubans possèdent des durées de vie entièrement conforme aux exigences d’ERDF.
LINK
http://researchers.edf.com/fichiers/fckeditor/Commun/Innovation/theses/TheseMouhamad.pdf

Performance evaluation of amorphous hexa-core for distribution transformers by JOSEFIN ALMÉN & MÅNS BREITHOLTZ

LINK
http://publications.lib.chalmers.se/records/fulltext/167013.pdf

The integrated Operation and Design of the DC Distribution Systems combined Wind Turbine and Photovoltaic Power Systems Shin,Soo Cheol Department of Electrical and Computer Engineering Sungkyunkwan University

The integrated Operation and Design of the DC
Distribution Systems combined Wind Turbine and
Photovoltaic Power Systems
Shin, Soo Cheol
Department of Electricaland
Computer Engineering
Sungkyunkwan University

Because DC distribution system has more numerous advantages than AC distribution system,aircraftand shipshavebeen applied to the DC distribution system.because consumer and office equipment consisting of the electronic systems use DC power,the powercan be easily supplied to the load using simple power conversion system.especially,high efficiency power transmission is possible because the power conversion step supplying the power to the electronic load is small in DC distribution system.however,due to the power grid of land consisting of AC powergrid,most of the land power system are applied to the AC distribution system except for special cases such as IDC(InternetDataCenter) and etc. In this paper,design and control method of DC distribution system which can be connected with AC distribution system of land is proposed.In addition,it proved that the connection of renewable energy can bemore easily connected with DC distribution system than AC distribution system by connecting DC distribution grid with renewable energy such as wind power of PMSG type and photovoltaic system through the simulation and experiment. Three-phase AC/DC PWM converter can supply DC 380[V]to the DC bus in case that AC power distribution voltage is AC 220[V].however,because the secondary side of the transformer consists of Y connection and 380[V]in most of the commercial building,in order to configure a DC distribution system,it is boosted to DC 700[V]using three-phase AC/DC PWM converter.And then,the DC distribution system of DC 380[V] was constructed using non-isolated bidirectional DC/DC converter
 LINK
https://www.mediafire.com/?hnf7uldn6n5g6bf

Design strategy of high power LED arrays for various applications Bong-Ryeol Park School of Electronic and Electrical Engineering Graduate School Hongik University

Design strategy of high power LED arrays for
various applications

Bong-Ryeol Park
School of Electronic and Electrical Engineering
Graduate School Hongik University

Thermal effects in LED arrays were investigated as a function of LED
power, and spacing. For high power LEDs, the increase in junction
temperature due to a high driving current plays an important role in LED
performance, e.g. conversion efficiency, optical degradation, etc. Since the
maximum driving power that determines LED brightness is limited by the
critical junction temperature, thermal influence from adjacent LEDs in an
array has to be also taken into account carefully. The relationship
between maximum allowed driving power and LED BLU design
parameters are discussed along with other factors to be concerned.
LINK
http://www.mediafire.com/view/z7xzvfz8c839x5r/LED-HIGH-POWER-2014.pdf

Participantes destacam atualidade e excelência do Diálogo BRASIL-ALEMANHA

Realizado nos dias 30 de setembro e 1º de outubro, o 3º Diálogo Brasil-Alemanha de Ciência, Pesquisa e Inovação alcançou seus principais objetivos. Com a Matemática como tema central, o evento buscou incentivar a troca de informações e ideias entre profissionais de diversas áreas ligadas à ciência. O evento, organizado pelo Centro Alemão de Ciência e Inovação – São Paulo, aconteceu na Biblioteca Mário de Andrade.

O engenheiro Armando Cavero Miranda, presente no evento, elogiou a escolha do tema do Diálogo Brasil-Alemanha, já que vê uma grande necessidade de incentivar os jovens a seguir carreira nessa área. “Existe uma preocupação em muitos países, como o Brasil e a Alemanha, em se criar um estímulo entre os jovens para que continuem estudando Matemática, porque ela está em todas as áreas da tecnologia, na indústria ou na ciência”, afirmou Miranda, que também elogiou a organização do evento e a escolha dos palestrantes.

O engenheiro destacou a apresentação de Marcelo Viana da Silva sobre o programa Profmat, especialização para os professores de Matemática do Brasil. “É preciso difundir novas tecnologias didáticas, que estão sendo desenvolvidas tanto no Brasil quanto em outros lugares. Para os países sustentarem seu desenvolvimento, precisam de mais engenharia e matemática.”

Para o participante Odilon Otávio Luciano, professor do Instituto de Matemática e Estatística da Universidade de São Paulo, a organização do evento foi impecável e proporcionou excelentes oportunidades de contato. A qualidade do conteúdo também foi ressaltada por ele.  “O evento foi muito estimulante por tratar de um tema unificador de grande atualidade e ampla abrangência científica. Os painéis exibiram conteúdos com riqueza de diversidade e competência, evidenciando a fertilidade científica do paradigma das redes complexas.”

Organização
Para Marcio Weichert, coordenador do Centro Alemão de Ciência e Inovação – São Paulo (DWIH-SP), os objetivos do Diálogo foram atingidos. “Atraímos um público de alto nível, que incluía estudantes até pesquisadores seniores de diversas áreas do conhecimento.

ARTIGO COMPLETO NO WEBSITE ORIGINAL
http://www.dwih.com.br/index.php?id=182&L=1&tx_ttnews%5Btt_news%5D=723&cHash=cf8365788075697e5eba8f9c8b494f69

Brasileiro vencedor da Medalha Fields é recebido em Brasília

Control Design of Series Connected MOSFETs for High Voltage Applications

 Control Design of Series Connected MOSFETs for High
Voltage Applications
Mirko Bodach, Lutz Zacharias, Björn Veit, Ringo Lehmann, Bernd Günther, Denny Ehrler
University of Applied Sciences Zwickau, Dr.-Friedrichs-Ring 2A, D-08056 Zwickau, GERMANY,
Mirko.Bodach@fh-zwickau.de, Bjoern.Veit@fh-zwickau.de, Lutz.Zacharias@fh-zwickau.de,
Ringo.Lehmann@fh-zwickau.de, Bernd.Guenther@fh-zwickau.de, Denny.Ehrler@fh-zwickau.de

Abstract
A new electro-mechanical converter concept for renewables needs a special DC / DC converter.
The converter has to transform a voltage of about 8 kV into a lower voltage of about 400 volts
covering a power range of 250 up to 1,000 W. Using this type of converter, semiconductor
switching elements are required, which can handle a voltage of about 8 kV and carrying a direct
current of about 60 mA.

WEB SEMINARY 18/10/2014 -10A.M. Switch Mode Power Supply Measurements using Oscilloscopes

Switch Mode Power Supply Measurements using Oscilloscopes

PRESENTER Johnnie Hancock, Oscilloscope Product Manager, Keysight Technologies Johnnie Hancock is an Oscilloscope Product Manager at Keysight Technologies. He began his career with Hewlett-Packard in 1979 as an embedded hardware designer, and has over 35 years test and measurement experience in various roles for HP, Agilent, and now Keysight Technologies. Johnnie is currently responsible for application support activities and he regularly speaks at technical conferences worldwide. Johnnie graduated from the Universityof South Florida with a degree in electrical engineering.

WHO SHOULD ATTEND

Engineers and technicians testing or debugging switch mode power supplies.

Onde e quando

Preço	Data(s)	Local	Para mais informações
Gratuito	2014-11-18 10:00 Pacific	At Your PC	Enroll to view the November 18, 2014 live broadcast

LINK
http://www.keysight.com/main/eventDetail.jspx?cc=BR&lc=por&ckey=2477362&nid=-536902447.0&pid=1000001736%3Aepsg%3Apgr

PCIM 2014 FPGA-Based Multilevel PWM Single-Phase Cascaded Inverter for ...

PCIM SOUTH AMERICA 2014 INTERNATIONAL CONFERENCE AND EXIBITION FOR POWER ELECTRONICS 14-15 OUTUBRO FPGA-Based Multilevel PWM Single-Phase Cascaded Inverter for Power Electronics Research.