AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS  DO MAL"

“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

sábado, 5 de dezembro de 2015

COBEP2015 FORTALEZA CEARA BRASIL TUTORIAL DR. CUK





Power Electronics: A New Beginning By Slobodan Ćuk, TESLAco
Power Electronics progress depends on the progress in its two constituent areas: System Technology and Power Management Technology, which had been traditionally developed in the past in companies specializing in either one or the other area of expertise. System Technology companies, or Power Supply companies relied heavily on the use of the components (switches, drive and control circuits) developed by Power Management companies.
The System Technology popularly known as converter topologies has changed very little in last 50 years and is, in fact, the key reason why the Power Electronics as whole has progressed much less despite the tremendous advances made by Power Management companies in developing the new switching devices with ever increasing switching devices power and speed improvements and high performance digital control circuits.
The conventional topologies are analyzed and the sources of their deficiencies are established. This, in turns, leads to the new switching methods and the corresponding novel switching converter topologies which are overcoming all these deficiencies. However, no incremental change will do, but a fresh new look is needed. Hence what is needed is: Power Electronics: A New Beginning!
Dr. Slobodan Ćuk
Dr. Ćuk received his bachelor degree from Belgrade University, Yugoslavia, 1970, MSEE degree from University of Santa Clara, USA 1974 and her Ph.D. from Caltech, California , USA, 1976.
Dr. Ćuk was the full-time Professor of Electrical Engineering at the California Institute of Technology until January 1, 2000 where he conducted research and taught courses in Power Electronics and Fundamentals of Energy Processing. During his 25 years at Caltech, more than 35 students obtained Ph.D. degree in Power Electronics under his guidance. More than dozen of his former students are Professors of Power Electronics in U.S. and abroad while others are leading researchers in the industry.
For the invention of Integrated Magnetics Dr. Ćuk obtained a 1991 Edward Longstreth Medal from Franklin Institute which was for the first time in its 100 years history awarded to researchers in Power Electronics. His publications include over 100 scientific papers in the Power Electronics field and a three-volume book on Switched-Mode Power Conversion.
Over a span of 20 years, Dr. Ćuk has taught a number of public and in-house courses in United States, Europe and Far East, which were attended by over 4,000 Power Electronics specialists. In 1979, Dr. Ćuk founded TESLAco. He holds over 20 patents in switching power conversion filed. Over dozen patents on Ćuk Optimum Power Conversion technology are pending or are currently in preparation.
Dr. Ćuk’s Inventions and Discoveries
1. Optimum Topology Converter, known as the ĆUKconverter (1974)
2. Coupled-Inductor and Integrated Magnetics method (1975)
3. State-space averaging method (1975)
4. TESLAconverter (2000)
5. Hybrid-switching and Storageless-Switching Method (2009)
6. New DC-DC and Bridgeless AC-DC converter topologies (2010):

quinta-feira, 12 de novembro de 2015

A study on Auto Transformer protective method for AC electric railway system.





A study on Auto Transformer protective method for AC electric railway system.

 Son, Dong-Shic Department of Railroad Engineering The Graduate School of Green Railroad Woosong University

An AC electric railway uses AT(auto transformer), BT(Booster Transformer), and direct power feeding system. Today, as a result of an increase in use of load current system, AT feeding system has became a mostly and widely used system due to its profitability in high and long-distance power feeding and inductive interference. AT is a core facility of the AC electric railway, a major public transportation, in AT traction power feeding system thus, the suspension of train operation due to the malfunction of AT feeding system would causes not only a high volume of civil petitions but also an interruption to the power supply to the train that could bring a second incident. In general, the power transformer protection is classified into electronic protection that includes differential protection (87T), over current protection (50/51), and earth fault protection (50/51N), and the mechanical protection such as buchholz relay, sudden pressure relay, winding temperature indicator, temperature indicator for insulation oil however, the failure in the operation of AT is protected only by an alarm signal controlled by substation using current and impedance relay. Therefore, to prevent the failure in mechanical protection, sectioning post(SP), sub-sectioning post(SSP), and parallel post(PP) needs to be protected by electronic protection as well as mechanical protection. In addition, accidents related to AT traction power supply system are divided into an outside (on railroad) accident mostly occurred due to traction line earth(T-R earth), feeding line earth(F-R earth), sectioning line earth(F-R earth), and short circuit(T-R short circuit) between feeding and sectioning linen, and an inside (at substation) accident mostly occurred due to earth and short circuit of AT winding furthermore, no matter what type of accident related to AT traction power supply system occurs it is protected by over current or impedance relay from substation Even though the AT related accidents could result in the discontinuation of rail service due to an inability to separate the feeder section, it is difficult to find whether the type of accident is outside or inside. As a result, it unnecessarily costs long time to deal with the accident because of unclearness of the cause.

segunda-feira, 9 de novembro de 2015

Network Analysis & Synthesis by Franklin F. Kuo


ESTUDIE INGENIERIA ELECTRONICA CON ESTE LIBRO ES UN GRANDE CLASICO
ENCONTRADO EN LA WEB CON ACCESO LIBRE EN LOS SIGUIENTES LINKS:
LINK ORIGINAL EN LA WEB
https://archive.org/details/NetworkAnalysisSynthesis
LINK DIRECTO PARA BAJAR EN FORMATO PDF
https://archive.org/download/NetworkAnalysisSynthesis/Kuo-NetworkAnalysisSynthesis.pdf

About the Internet Archive  https://archive.org/about/
The Internet Archive is a 501(c)(3) non-profit that was founded to build an Internet library. Its purposes include offering permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format.

Founded in 1996 and located in San Francisco, the Archive has been receiving data donations from Alexa Internet and others. In late 1999, the organization started to grow to include more well-rounded collections. Now the Internet Archive includes: texts, audio, moving images, and software as well as archived web pages in our collections, and provides specialized services for adaptive reading and information access for the blind and other persons with disabilities.

PROBLEMAS RESUELTOS ELECTROMAGNETISMO- LOPEZ R.






AGRADEÇO A COLABORAÇAO DO ENG, JORGE MIREZ DE LA UNI -PERU
LINK ORIGINAL
https://jmirezphysics.files.wordpress.com/2011/10/problemas_resueltos_de_electromagnetismo_2da_edicion_victoriano_lopez_rodriguez.pdf

domingo, 8 de novembro de 2015

CALCULO Y ANALISIS DE REGIMENES DE TRABAJO DE REDES ELECTRICAS -VENIKOV,ANISOVA,FOKIN-Расчеты и анализ режимов работы сетей -Веников В.А.,Фокин, Анисова,Федоров



LINK BOOK RUSSIAN VERSION
http://www.mediafire.com/view/u8jrakyr19ftol7/CALCULO_Y_ANALISIS_DE_REDES_ELECTRICAS-VENIKOV.pdf
Electrical network performance calculations and analysis / General editor V. A. Venikov [and others] ; translated from the Russian by O.B. Volodina. - Rev. from the 1974 Russian edition.
Moscow : Mir Publishers,

Anisimova N.D., Ezhkov V.V., Fedorov D.A., Fokin Yu.A., Venikov V.A., Zhukov