Electrotechnics and Electrical Machinery
Code
10998
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Engenharia Electrotécnica
Credits
6.0
Teacher in charge
Pedro Miguel Ribeiro Pereira
Weekly hours
5
Total hours
76
Teaching language
Português
Objectives
The students, through rigorous scientific deduction, should become aware of the mathematical and physical foundations of applied electrotechnics, namely, of the electric power’s production, distribution and use, and of the composition and characteristics of the most relevant industrial electrical machines.
On the other hand, students must become competent to model, analyse and calculate simple electric power circuits and networks, including balanced three-phase ones. Students will become able to make technically based choices of simple electrical equipments.
Prerequisites
Students should have basic knowledge of electromagnetism and mathematical analysis, including complex number analysis.
Subject matter
Electrical Quantities. Voltage-current equations of capacitors, inductors and resistors.
DC electrical networks. Kirchhoff’s laws.
AC circuit analysis. Sinusoidal functions. Complex representation. Phasors and complex Amplitudes.
Complex impedance. Active, reactive, apparent and complex powers. Complex Poyting’s Theorem. Ressonance. Power factor correction.
Three-phase systems. Fundamentals of power production and transportation.
Magnetostatics. Magnetic circuit
Magnetic linkage in mono and three-phase transformers. Transformer theory. Steinmetz equivalent circuit.
Induction machine.
DC Motor.
Sincronous machine.
Bibliography
Vítor Meireles, Circuitos Eléctricos 6ª Edição, LIDEL, 2010.
John Bird, Electrical Circuit Theory and Technology 2nd Ed, Newnes, 2003.
Folhas teóricas disponibilizadas ao longo do semestre.
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 slides.
Experimental work at lab.
Evaluation method
Evaluation:
Includes a theoretical component (Comp. TP) and a practical component (Comp. P), with weights of 75% and 25%, respectively, for the final classification.
Comp. P - Two experimental works (TA1 and TA2), whose classification must be greater than or equal to 9.5 and is mandatory for obtaining frequency.
Comp. TP - can be made by:
a) 2 Tests (T)
Classif. Comp. TP = (0,50*T1 + 0,50*T2)/2 >= 9,5 val.
with T2 >= 7 val.
b) Final Exam (Ex) >= 9,5 val.
The final grade is obtained by:
NF = (0.75 * Comp.TP) + (0.1 * TA1 + 0.15 * TA2)
ONLY numerical calculators will be allowed during tests and/or exams.