General Electrical Engineering
Code
11054
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Engenharia Electrotécnica
Credits
6.0
Teacher in charge
Anabela Monteiro Gonçalves Pronto, João Miguel Murta Pina
Weekly hours
4
Total hours
33
Teaching language
Português
Objectives
The students should acquire mathematical and physical foundations of applied electrotechnics, namely, of the electric power’s production, distribution and use, and should also obtain solid knowledge concerning composition and characteristics of the most relevant electrical machines used in energy systems.
Prerequisites
Knowledge adequate to the level of study, namely:
- Fundamentals of electromagnetism
- Complex numbers
- Differential and integral calculus
Subject matter
I. Direct current circuits analysis
1. Eletric resistence, power and energy (a review)
2. Kirchoff laws
II. Alternate current circuit analysis
1. Inductors and capacitors
2. Average value and RMS value of a time variable signal
3. Complex amplitude and fasors
4. RL, RC and RLC circuits
5. Power
6. Power factor correction in an industrial power plant
III. Triphasic circuits analysis
IV. Transformers
1. Principle of operation
2. General equations
3. Equivalent eletrical circuit for ideal and real transformer
4. Applications
V. Assynchronous machine (or, induction machine)
1. Constitution and operation principles as motor and generator
2. Induction motor: mechanical speed, torque, power and efficiency
3. Equivalent electrical circuit of the motor
4. Speed control processes
5. Applications
VI. Synchronous machine (or, alternator)
1. Constitution and operation principles of synchronous generator
2. Equivalent electrical circuit of the generator
3. The generator working in an isolated grid
4. Parallel connection of synchronous generator
5. Salient pole synchronous generator: main characteristics and applications
Bibliography
- Vítor Meireles, Circuitos Eléctricos 6ª Edição, LIDEL, 2010.
- John Bird, Electrical Circuit Theory and Technology 2nd Ed, Newnes, 2003.
- Documentation provided by the lecturer.
Teaching method
The distinct concepts, techniques and theories are explained by the lecturer with the support of slides and practical demonstrations with different equipments.
Students assess their skills through semiautonomous resolution of sets of problems, available in the support materials.The team work is encouraged. The oral communication is stimulated.
Evaluation method
The evaluation method could be one of the following:
a) 3 Tests (MT)
Final classification = (0,30*MT1+0,35*MT2+0,35*MT3) >= 9,5 val.
with MT3 >= 7,0
b) Final Exam (Ex)
Final Classification = Ex. Classification >= 9,5 val.
The final classification on CEE will be the weighted average of the three tests, as indicated in a), or the final exam classification. In both cases, to be approved, student must have a final classification equal or greater then 9.5 values (in a 0 to 20 scale).