Publication in the Diário da República: Aviso n.º 11062/2017 - 25/09/2017 + Decl. Rectif. nº 359/2018 de 11 de Maio
4 ECTS; 1º Ano, 2º Semestre, 52,50 TP , Cód. 627311.
Lecturer
- Raul Manuel Domingos Monteiro (1)(2)
(1) Docente Responsável
(2) Docente que lecciona
Prerequisites
Not applicable.
Objectives
To equip students with the techniques and fundamental concepts most commonly used in the analysis of single-phase and three-phase alternating current electrical circuits and systems.
Program
1. Fundamental quantities and components of electrical circuits; definitions. 1.1 Electric Current. Electric voltage. Forms of electric current: unidirectional current and variable-direction current; alternating current. 1.2 International system of units; prefixes. 2. Single-phase sinusoidal alternating current. 2.1 Necessity of alternating current. 2.2 Characteristic quantities. Mathematical representation. Phase angle between sinusoidal quantities of the same frequency; particular values. Vector representation. 2.3 Characterization of circuit elements in sinusoidal alternating current regime: resistance, coil, and capacitor; voltage-current relationships in the time domain, instantaneous power, average or active power, and stored energy. 2.4 Complex numbers as a tool for solving electrical circuits in sinusoidal alternating current; elementary operations with complex numbers. 2.5 Symbolic representation of sinusoidal alternating quantities using phasors. Time domain and frequency domain. Operations with sinusoidal functions in the time domain and corresponding operations in the frequency domain. 2.6 Concept of impedance and admittance; reactance, conductance, and susceptance. Voltage-current relationships of resistance, coil, and capacitor in the frequency domain. Kirchhoff's laws in the frequency domain. Association of impedances and admittances. 2.7 Active, reactive, and apparent power. Power factor. Power triangle. Calculation of power and power factor for elements connected in parallel (single-phase electrical installation). Power factor compensation. 2.8 Resonance and resonance condition. Examples of the resonance phenomenon. Maximum power transfer; impedance matching. 3. Three-phase sinusoidal alternating current. 3.1 Three-phase voltage system. Mathematical and vector representation. Star and delta connection. 3.2 Balanced and unbalanced systems. 3.3 Power in three-phase systems. Boucherot's method. Power factor compensation in three-phase systems; practical considerations. 4. Introduction to magnetism and electromagnetism. 4.1 Electric current and magnetic field. Magnetic circuits. 4.2 Operating principle of the electric transformer. 4.3 Conclusions.
Evaluation Methodology
Written tests throughout the semester (continuous assessment) or final exam. Passing grade: final grade based on the average of the tests or the final exam of 9.5 or higher out of 20.
Bibliography
- O'Malley, J. (2011). Schaum's Outline of Basic Circuit Analysis (Schaum's Outline Series). (Vol. 1). McGraw-Hill: McGraw-Hill
- Albuquerque, R. (2008). Análise de Circuitos em Corrente Alternada. (Vol. 1). Editora Érica: Érica
- Hayt, W. e Kemmerly, J. e Durbin, S. (2008). Análise de Circuitos em Engenharia. (Vol. 1). McGraw-Hill: McGraw-Hill
- Monteiro, R. (0). Eletrotecnia-CTeSP em IEMI. Acedido em 26 de fevereiro de 2016 em http://www.e-learning.ipt.pt/course/category.php?id=187
Teaching Method
Theoretical and practical classes for presenting the theoretical material and for solving exercises. .
Software used in class
Not applicable.
