Discipline details

Course details

Recommended Prior Knowledge

É importante o estudante ter conhecimentos prévios de análise de circuitos elétricos em corrente continua e em corrente alterna, eletromagnetismo e circuitos magnéticos, e operações com números complexos.
Objectives

Students, at the end of this course, should be able to:
1- Understand/explain the construction aspects of the Transformer (TR), the Three Phase Induction Machine (MIT) and the Single Phase Induction Motor (MIM). Justify by laws and rules the working principle of each ones;
2- Determine/estimate the TR, MIT and MIM mathematical model parameters. Apply / implement the mathematical model in the prediction of operating regimes. Explain/justify the conditions to carry out the TR parallel connection to the infinite power network;
3- Understand/ explain the TR, MIT and MIM characteristics;
4- Analyse the TR, MIT and MIM energy flow and efficiency;
5- Understand/explain the construction aspects of the autotransformer, the working principle of the induction generator, and MIM starting conditions and assistance.
6- Interpret the electrical diagrams and make TR, MIT electrical connections and tests. Apply Matlab software for solving TR and MIT problems.
Teaching Methods

The teaching methodology, in the context of theoretical-practical (T-P) classes, is based on active learning techniques aiming at greater involvement, sharing, autonomy and critical thinking of the students in order to
build their knowledge. The students work out their resources using electrotechnics concepts within the reality of the electrical machines (TR, MIT and MIM) making their competences’ acquisition in the exercise of the learning activities.
The evaluation of the T-P component is continuous and based on quizzes and real problems, being carried out at the end of each learning activity.
In the context of the laboratory classes active learning techniques are applied in a collaborative group environment. Laboratory work will be focused on solving problems, promoting the subjects understanding.
The students use a computer tool for machine modelling in order to predict and estimate operating regimes.
The evaluation of the laboratory component is done by work report and discussion.
Internship(s)

Não
Syllabus

I. Single-phase Transformers (TR)
1. Constitution and principle of operation
1.1 No-load operation
1.1.2. Perfect and ideal TR
1.1.3. Electromotive force. Transformation ratio
1.1.4. Real TR
1.2 Load operation
1.2.1. Perfect and ideal TR
2. Real TR
3. TR test.
4. Energy diagram. Efficiency
5. Autotransformers
II - THREE-PHASE TRANSFORMER
1. Construction. Fluxes. Working principle. Connection groups
2. Parallel of Three-phase transformers. Load sharing.
III. THREE-PHASE INDUCTION MACHINE (MIT)
1. Principle of Operation of a MIT
2. Construction aspects of the MIT. Equivalent circuits
3. Mechanical curve
4. Energy diagram. Powers and Torque. Efficiency
5. Generator
6. Criteria for Selecting a MIT
IV. SINGLE_PHASE INDUCTION MOTOR
1. Construction and principle of operation
2. Equivalent circuits. Energy diagram
3. Mechanical curve.
4. Powers and Torque. Efficiency
5. Starting assistance techniques
Content Explanation

-
Methodology Explanation

-
Responsible Lecturer(s)

Pedro José Ambrósio Lobato - 2.º Semester
Bibliography

M. Gaspar Guerreiro; Máquinas Trifásicas de indução, ESTSetúbal, 2005
M. Gaspar Guerreiro; Introdução aos Transformadores, ESTSetúbal, 2003
A.E.Fitzgerald; Máquinas Eléctricas, McGraw-Hill do Brasil, 1975. ISBN: 0-07-090132-5 (Mediateca da ESTSetúbal)
Jesus Fraile Mora; Máquinas Elétricas, McGraw-Hill, 2003. ISBN: 84-481-3913-5