Didactic platform for teaching of three-phase rectifier circuits in power electronics

2014 ◽  
Vol 51 (4) ◽  
pp. 279-291 ◽  
Author(s):  
Marcelo R. S. Brito ◽  
Fernando C. Melo ◽  
Luiz C. Freitas ◽  
João B. Vieira ◽  
Ernane A. A. Coelho ◽  
...  
Keyword(s):  
Power Electronics ◽  
Learning Process ◽  
Electrical Engineering ◽  
Operating Conditions ◽  
Laboratory Activities ◽  
Mixed Use ◽  
Three Phase ◽  
The Subject ◽  
Materials Used ◽  
Rectifier Circuits

With the aim of preventing an Electrical Engineering course from being predominantly theoretical, the didactic materials used in laboratory activities are essential to make the learning process easier and more stimulating for the student. In this context, this paper presents a didactic platform developed for teaching a.c.-d.c. converters in the subject of power electronics at the Federal University of Uberlândia (UFU), Brazil. The proposed platform consists of a three-phase controlled and/or uncontrolled rectifier. The IC TCA785 is used to control thyristor operation. In order to make teaching more dynamical, the didactic platform was designed to have various operating conditions, simulating, for example, breakdown components and mixed use of thyristors and diodes. A prototype of the proposed platform was built, evaluated experimentally in the laboratory and the results are shown in this paper.

Temperature Distribution in Advanced Power Electronics Systems and the Effect of Phase Change Materials on Temperature Suppression During Power Pulses

2000 ◽  
Vol 123 (3) ◽  
pp. 211-217 ◽  
Author(s):  
A. G. Evans ◽  
M. Y. He ◽  
J. W. Hutchinson ◽  
M. Shaw
Keyword(s):  
Thermal Analysis ◽  
Phase Change ◽  
Power Electronics ◽  
Phase Change Materials ◽  
Power Input ◽  
Operating Conditions ◽  
Junction Temperature ◽  
Package Design ◽  
Materials Used

A thermal analysis has been performed for a package design pertinent to power electronics. The objective has been the derivation of straightforward expressions that relate the materials used and their physical dimensions to the power input and the junction temperature. This has been done for both steady-state operating conditions and for pulses. The role of phase change materials (PCMs) in suppressing temperature elevations during pulses is also addressed.

The Concept of Mechanical Part of the Model Micro-Energy Sources for Electrical Laboratories

2016 ◽  
Vol 835 ◽  
pp. 810-815 ◽  
Author(s):  
René Drtina ◽  
Jaroslav Lokvenc ◽  
Josef Šedivý ◽  
Jan Škoda
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Electrical Engineering ◽  
Renewable Energy Sources ◽  
Operating Conditions ◽  
Energy Sources ◽  
Operating Modes ◽  
Alternative Energy Sources ◽  
Asynchronous Generator ◽  
The Subject

The use of renewable (alternative) energy sources of energy is still a hot topic. In the electrical engineering laboratories of the Department of technical subjects created a model of micro energy sources that can be operated in various operating modes to simulate in various operating conditions. The machine set is dedicated for laboratory of electric engeneering. Goal is to show students in the subject Renewable energy sources and their application, practical use and parameters an the asynchronous generator. The article deals with the mechanical concept and mechanical construction of laboratory machine set.

CAES: Reduced to Practice

2001 ◽  
Author(s):  
John Daly ◽  
R. M. Loughlin ◽  
Mario DeCorso ◽  
David Moen ◽  
Lee Davis
Keyword(s):  
High Pressure ◽  
Learning Process ◽  
Gas Turbines ◽  
Operating Conditions ◽  
Compressed Air ◽  
Problem Solution ◽  
Fuel Injectors ◽  
Operating Modes ◽  
The Usa ◽  
The Subject

With the deregulation of the power industry, the use of peaking power solutions such as Compressed Air Energy Storage (CAES) is receiving increasing attention. The CAES plant located in McIntosh, Alabama, owned and operated by Alabama Electric Cooperative, Inc. (AEC) is the subject of this paper. It is the only such plant in the USA and one of two in the world. In off-peak hours the plant pressurizes a cavern with compressed air. During peak hours the stored cavern air is then valved through the combustion turbines to produce any level of peaking power required between 10 and 110 megawatts. This prototype plant began operating in May 1991 and its reliability has been steadily improved. This paper describes the learning process and plant-wide equipment modifications that were made to bring the plant to its present state of reliable operation. Because the CAES operating conditions and operating modes differ from conventional gas turbines, anticipated and unanticipated problems arose. The plant is made up of “combustion turbine” type components, but because of the way the plant operates (- valving of air input - relatively high pressure and air flows at startup - abrupt air flow shutoff at shutdown), certain operating experiences are unique to a CAES plant and not seen on standard gas turbine plants. Among the areas discussed are: controls, stand-by combustor, low-pressure (LP) expander, cavern well liner, lube oil, exhaust flow damper, high-pressure (HP) combustors, LP combustors, fuel injectors, fuel handling, and hot gas path instrumentation. These topics are discussed in the problem, solution, recommendation format. The learning process described in the paper will serve as an invaluable guide to plant designers as future CAES plants are built.

scholarly journals Aplikasi Monitoring Aset dan Inventaris Laboratorium Berbasis Web Pada Kampus Politeknik Negeri Ujung Pandang

2019 ◽  
Vol 6 (1) ◽  
pp. 59
Author(s):  
Mardawia Mabe Parenreng ◽  
Mardhiyah Nas
Keyword(s):  
Learning Process ◽  
Teaching And Learning ◽  
System Development ◽  
Electrical Engineering ◽  
Science And Technology ◽  
Laboratory Data ◽  
Engineering Majors ◽  
The Creation ◽  
Materials Used ◽  
Data Checking

Polytechnic is a university that organizesvocational education in various science and technology clusters.The learning process in polytechnic is dominated by practicumthat is 70% and 30% theory. The amount of laboratorypercentage affects the large number of laboratory. Eachlaboratory has a laboratory responsible (technician) in charge ofrecording and monitoring the completeness and condition of thepracticum equipment. Tools and materials used in the process ofpracticum is an asset and laboratory inventory that must alwaysbe maintained and checked the condition of the equipment. InUjung Pandang State Polytechnic (PNUP) in terms of assetmonitoring and practicum inventory is still done manually.Therefore need to make an application to monitor assets andlaboratory inventory, especially on campus two. It is known thatsince 2014 there are three departments that have implementedthe teaching and learning process in two campuses includingseveral laboratories have also been transferred to the twocampuses, such as electrical engineering majors, majoring inbusiness administration and accounting majors. So with thisapplication will greatly help technicians because no longer do thereporting or request tool manually and with this application inmonitoring the condition of the tool is damaged and tools thatneed further improvement more easily and can be quicklyupdated. The creation of this system begins with the needsanalysis, design design as the basis of system development, theright of access consists of technicians of each laboratory andprocurement department on campus one, content creationconsists of laboratory data, checking tools and materials, repairtools and materials and demand tools and materials then printdata laboratory

scholarly journals THE DEVELOPMENT OF POWER ELECTRONICS TRAINING KITS FOR ELECTRICAL ENGINEERING STUDENTS: A VALIDITY TEST ANALYSIS

2020 ◽  
Vol 3 (2) ◽  
pp. 114-120
Author(s):  
Citra Dewi ◽  
Doni Tri Putra Yanto ◽  
Hastuti Hastuti
Keyword(s):  
Power Electronics ◽  
Learning Process ◽  
Engineering Students ◽  
Electrical Engineering ◽  
Laboratory Equipment ◽  
Test Analysis ◽  
Validity Test ◽  
A Value ◽  
Validated Questionnaire ◽  
Design Media

This study discusses one of the stages of the research in the development of the Power Electronics Training Kits in the learning process of the Power Electronics Practicum for Electrical Engineering students, namely the validity test analysis. The validity of the Power Electronics Training Kits is divided into three aspects, namely design, media/laboratory equipment, and materials aspects. Each of these aspects was validated each by two validators who had expertise in these aspects. The instrument used in testing this validity was a validated questionnaire that had gone through the previous instrument validation process. The analysis was carried out using Aikens V Analysis. Validity analysis results are interpreted with the product development validity interpretation table by Aiken's to obtain the validity category. The results showed the Training Kits is valid in all aspects both aspects of design, media/laboratory equipment, and materials. The design aspect gained a value of V = 0.89 with a valid category, the media/laboratory equipment aspect gained a value of V = 0.88 which means valid, and the material aspect gained a value of V = 0.94 with a valid category. Thus, it can be concluded that the Power Electronics Training Kits developed for the learning process of the Power Electronics Practicum for Electrical Engineering students is valid in the aspects of design, media/laboratory equipment, and materials.

scholarly journals Promising Nanoparticle-Based Heat Transfer Fluids—Environmental and Techno-Economic Analysis Compared to Conventional Fluids

2021 ◽  
Vol 22 (17) ◽  
pp. 9201
Author(s):  
Natalia Czaplicka ◽  
Anna Grzegórska ◽  
Jan Wajs ◽  
Joanna Sobczak ◽  
Andrzej Rogala
Keyword(s):  
Heat Transfer ◽  
Cost Efficiency ◽  
Operating Conditions ◽  
Heat Transfer Fluid ◽  
The Novel ◽  
Cooling Systems ◽  
Correct Operation ◽  
Heat Transfer Fluids ◽  
The Subject ◽  
Materials Used

Providing optimal operating conditions is one of the major challenges for effective heating or cooling systems. Moreover, proper adjustment of the heat transfer fluid is also important from the viewpoint of the correct operation, maintenance, and cost efficiency of these systems. Therefore, in this paper, a detailed review of recent work on the subject of conventional and novel heat transfer fluid applications is presented. Particular attention is paid to the novel nanoparticle-based materials used as heat transfer fluids. In-depth comparison of environmental, technical, and economic characteristics is discussed. Thermophysical properties including thermal conductivity, specific heat, density, viscosity, and Prandtl number are compared. Furthermore, the possible benefits and limitations of various transfer fluids in the fields of application are taken into account.

Applying Circle Game to Enhance Students’ Speaking Skill

2020 ◽  
Vol 7 (2) ◽  
pp. 119
Author(s):  
Putri Denaya Side Ayu ◽  
Heri Hidayatullah ◽  
Sri Ariani
Keyword(s):  
Action Research ◽  
Learning Process ◽  
Active Involvement ◽  
Post Test ◽  
Speaking Skill ◽  
The Subject ◽  
The Mean ◽  
Classroom Action Research ◽  
Speaking Skills

This Collaborative Classroom Action Research aimed at enhancing students’ speaking skill through the application of Circle Game. It was conducted in one cycle consisting of two meetings. The subject was the seventh of C class of SMPN 2 Alas Barat consisting of 22 students. The types of data were qualitative (acquiring observation during the learning process) and quantitative (speaking tests). The results qualitatively showed that the implementation of Circle Game enhanced the students’ speaking skills. Such improvement could be seen from their enthusiasm, their interesting feeling in various materials presented by the teacher, their active involvement. In the quantitative findings, the result also showed a higher value of the mean score of the post-test (77.34) rather than the pre-test (75.75). In conclusion, the use of Circle Game can improve students’ speaking skill.

PENERAPAN METODE DISKUSI UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS I SDN 004 TEMBILAHAN KOTA KECAMATAN TEMBILAHAN KABUPATEN INDRAGIRI HILIR

2018 ◽  
Vol 2 (2) ◽  
pp. 173
Author(s):  
Jaimah Jaimah
Keyword(s):  
Action Research ◽  
Initial Data ◽  
Learning Outcomes ◽  
Learning Process ◽  
Mathematics Learning ◽  
First Grade ◽  
Average Value ◽  
Concrete Objects ◽  
The Subject ◽  
Classroom Action Research

The background of this research is the low of mathematics learning result of grade 1 student of SDN 004Tembilahan Kota, for that done perbaiakan learning process by applying method of discussion. This researchwas conducted in SDN 004 Tembilahan Kota with the subject of research is the first grade students with 36students. This research is a classroom action research conducted two cycles. Based on the results of theresearch, it is found that the use of the method of disuksi can improve the students' learning outcomes aboutknowing and determining the length and weight with nonstandard units using concrete objects / concretesituation in the initial data, the total number of completed students is 12 students (33.3%) average 55.83. In thefirst cycle has increased the number of students who complete is 26 students (77.22%) with an average value of80.00. In the second cycle has increased with the total number of students who completed is 32 students (88.89)with an average value of 88.06.

HUBUNGAN PROFESIONALISME PENDIDIK TK DENGAN KINERJA PENDIDIK DI TK RAYON IV KOTA DUMAI

2019 ◽  
Vol 3 (3) ◽  
pp. 660
Author(s):  
Ranirizal Ranirizal
Keyword(s):  
Learning Process ◽  
Subject Matter ◽  
Significant Relationship ◽  
Teacher Performance ◽  
Teacher Professionalism ◽  
Learning Material ◽  
The Subject ◽  
Performance Development ◽  
Kindergarten Educators ◽  
Academic Qualifications

Performance is the performance shown by educators, both in quality and quantity in carrying out their duties in accordance with the responsibilities given to them professionally. Educator performance development is a very decisive factor in the success of the education and learning process. In fact, in Kindergarten Rayon IV, Dumai City, there is still a low level of competency standards possessed by educators. The intended competency standard is from the standard academic qualifications and four competencies that must be possessed by a kindergarten educator, namely pedagogic, professional, social and personality competencies. This is evidenced by educators not yet mastering learning material with the maximum known when the learning process educators are not able to explain well the subject matter, and educators have not shown maximum performance in carrying out their duties and functions. The purpose of this study was to see whether there was an influence on teacher professionalism on teacher performance in Dumai IV Rayon Kindergarten. The results of the study prove that there is a significant relationship between the professionalism of Kindergarten educators and the performance of educators in Kindergarten Rayon IV, Dumai City. This is evidenced by the value of Sig (2-tailed) professionalism on educator's performance of 0,000, so the calculation shows 0,000 <0.05. This means that Ha is accepted, that is, there is a significant relationship between the professionalism of Kindergarten educators and the Performance of Educators in Kindergarten Rayon IV, Dumai City.

IMPROVING THE STUDENTS’ READING COMPREHENSION ACHIEVEMENT IN DESCRIPTIVE TEXT THROUGH TEAM GAMES TOURNAMENT

2014 ◽  
Vol 3 (3) ◽  
Author(s):  
DesiYusnanda Sari And Sri MindaMurni
Keyword(s):  
Reading Comprehension ◽  
Learning Process ◽  
Quantitative Data ◽  
Qualitative Data ◽  
Reading Scores ◽  
Team Games ◽  
The Subject ◽  
The Mean ◽  
Teaching Learning ◽  
Data Reading

This study attempted to improve the students’ reading comprehension achievement in descriptive text through Team Games Tournament (TGT) method. This study was conducted by using classroom action research. The subject of the research was class IX SMP PAB 10 Medan Estate which consisted of 25 students. The research was conducted in two cycles and the first cycle consisted of four meetings the second cycle consisted of two meetings. The instruments for collecting the data were quantitative data (reading evaluation) and qualitative data (diary note, observation sheet and interview sheet). Based on reading scores, students’ score kept improving in every evaluation. In the test I the mean was 65,33, in the test II the mean was 71,72 and the test III the mean was 84,54.Based on diary note, observation sheet and interview sheet, it was found that teaching-learning process ran well. Students were active, enthusiastic, and interested in reading. The result of the research showed that Team Games Tournament (TGT) method significantly improved students’ achievement in reading comprehension especially in reading descriptive text.

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