Transformers and Induction Machines

Code:

M.EEC020

Acronym:

TMI

Keywords
Classification	Keyword
OFICIAL	Power

Instance: 2023/2024 - 1S

Active?	Yes
Responsible unit:	Department of Electrical and Computer Engineering
Course/CS Responsible:	Master in Electrical and Computer Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
M.EEC	68	Syllabus	1	-	6	45,5	162

Teaching language

Suitable for English-speaking students

Objectives

This course unit aims to endow students with fundamental knowledge in static and rotating electric machines, especially in electric transformers and induction motors.  Crosscutting aspects are discussed and key references are made about other machines.

Emphasis will be placed on:
1. Review of fundamental aspects common to electrical machines, including heating.
2. Three-phase electrical power transformers, including tests, special construction and operating aspects, certification, sizing and design algorithms and models for transient analysis.
3. Three-phase induction motors, including tests, special constructive aspects, motors for special environments, ATEX certification, design and project, starting and speed variation. Induction generators. Single-phase induction motor, universal motor and shaded pole motor.

Learning outcomes and competences

To complete this course unit, students have to:

1. Consolidadte technical knowledge in the classification, composition and phenomena which are part of the functioning of electric machines. Electric transformers and induction motors: general rules of selection, installation, use and maintenance. Students should be capable of applying their knowledge in the formulation, resolution and discussion of problems related to the above mentioned themes and its insertion in electrical energy systems (CDIO Syllabus 1.2 and 2.1). Students will have the chance to get familiar with these themes in classes (theoretical sessions dedicated to the presentation and discussion of the main themes of the course unit; theoretical-practical sessions dedicated to the analysis and resolution of theoretical-practical problems). It will take place tests and other evaluation elements to assess these skills.

2. Acquire knowledge in electric machine testing and experimental research about the functioning of transforms and induction motors, by doing laboratory assignments (CDIO Syllabus 2.2). These skills will be assessed by supervising students’ laboratory assignments and by the evaluation of the respective reports.

3. Develop professional skills and attitudes, both at an personal level (autonomous study and preparation of work) and group level (participation in group assignments during theoretical-practical and laboratory assignments). Students will be asked to have an active attitude towards professors and colleagues, regarding research of information, planning, preparing and carrying out an assignment (laboratory tests or resolution of theoretical-practical problems), as well as having a correct attitude in the laboratory, by respecting safety standards, and rules of using equipment and testing procedures (CDIO Syllabus 2.5). These skills will be assessed by supervising students during classes and tests.

4. Show communication skills, both oral (answering to questions during classes) and written (reports) (CDIO Syllabus 3.2).

Working method

B-learning

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

Circuit analysis
Eletromagnetism

Program

The program of the course includes the following matters:Part 1 - ELECTRICAL MACHINE FUNDAMENTALS
Review of fundamental aspects on the classification, constituent organs, phenomena that participate in the operation and efficiency of transformers, induction machines and electromechanical systems, including the general rules for their selection, installation, use and maintenance.

Part 2 - THREE-PHASE ELECTRICAL TRANSFORMERS
Tests, special construction and operating aspects, certification, sizing and design algorithms and models for transient analysis.

Part 3 - INDUCTION MACHINES
Three-phase induction motors: tests, special construction aspects, motors for special environments, ATEX certification, design and design, starting and speed variation. Induction generators. Single-phase induction motor, universal motor and shaded pole motor.

 

Mandatory literature

Jesús Fraile Mora; Máquinas eléctricas. ISBN: 84-481-3913-5 (Text base for supporting the study.)
Artur F. Costa; Documentação MELE, 2020 (ncludes theoretical notes, texts of lectures, problem statements for classes and other resolved and unresolved and scripts for laboratory work.)
Carlos Castro Carvalho; Transformadores (As an alternative to the main text in the part relating to Transformers)

Complementary Bibliography

Stephen J. Chapman; Electric machinery fundamentals. ISBN: 007-115155-9 (As an alternative to the main text.)
George McPherson; An introduction to electrical machines and transformers. ISBN: 0-471-05586-7 (As an alternative to the main text.)
Enrique Ras Oliva; Transformadores. ISBN: 84-267-0690-8 (As an alternative to the main text in the part relating to Transformers)
Austin Hughes; Electric motors and drives. ISBN: 0-7506-4718-3 (As an alternative to the main text in the part relating to Rotating Machines)
P. C. Sen; Principles of electric machines and power electronics. ISBN: 0-471-61717-2 (As an alternative to the main text.)

Teaching methods and learning activities

Classes:
Theoretical classes: exposition of the syllabus of the curricular unit, by the teacher.
Theoretical-practical classes: resolution of application exercises and development of experimental work.

Outside of class:
Besides regular study, students will be asked to write reports related with their assignments, which will be taken into account in the final grade. Students can schedule a meeting with the professors during office hours.

keywords

Technological sciences > Engineering > Electrical engineering

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Designation	Weight (%)
Exame	50,00
Teste	30,00
Trabalho laboratorial	20,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Elaboração de relatório/dissertação/tese	15,00
Estudo autónomo	90,00
Frequência das aulas	39,00
Trabalho laboratorial	6,00
Total:	150,00

Eligibility for exams

Students cannot miss more classes than allowed by the rules (3 theoretical-practical/laboratory classes). Students have to reach a minimum grade of 40% in Continuous Assessment component.

Calculation formula of final grade

FINAL CLASSIFICATION = 0.5 * FREQUENCY CLASSIFICATION + 0.5 * FINAL EXAM CLASSIFICATION

1 - FINAL EXAM (face-to-face, written, individual with an expected duration of 2 hours) = 50%.

- The exam focuses on the entire syllabus.

2 - FREQUENCY CLASSIFICATION = 50%

- The Frequency Classification results from the evaluation in the laboratory component of the UC (preparation, execution and report of predicted laboratory work), weighting 10%, in a special work about three phase power transformers, weighting 10%, and in two individual written tests throughout the semester, each with a weight of 15%.
- The tests focus on all the syllabus taught until the date on which they are carried out.


COMMENTS:

a) Approval to UC is subject to a minimum rating of 35% (7 out of 20) in the "EXAME" evaluation component.

b) The absences given in the laboratory sessions carried out in person, if they are not recovered by authorized substitution on a case-by-case basis, will imply the attribution of a ZERO classification.

c) Failure to any component or evaluation moment implies the attribution of a corresponding classification of ZERO.

d) Students with special attendance statutes can guarantee the Frequency Assessment component, carrying out the planned assignments and tests throughout the semester.

e) In the case of students with special needs, the guarantee of safety of people and equipment may justify the substitution of the laboratory work foreseen by another one, for the same purposes of frequency assessment, defined case by case by the teacher.

Special assessment (TE, DA, ...)

- Written Exam (written and/or oral), weighing 100%

Classification improvement

If the student has obtained a valid frequency classification (>=40%) in his/her last enrollment at the UC: follow the evaluation model for the first evaluation. Otherwise: Final Exam (written and/or oral) with 100% weight.

 

Observations