Eletrotecnia II

Circuit Theory 1, Mathematics and Physics

In theoretical-practical classes, a theoretical presentation of each subject is made, which is immediately complemented by the resolution of exercises to apply the acquired knowledge.

There is a theoretical practical component in which theoretical and practical works are carried out.

The objective of curricular unit Eletrical Circuit Theory II is
– to impart knowledge and understanding essential to solve circuits-phase AC sinusoidal,
transient phenomena in linear electric circuits, using the acquired data /knowledge in
Electrical Fundamentals I.
– to give students the principles and basic concepts of electric circuits analysis for single-
phase AC circuits, and resonance phenomena.

Skills
students should be able to:
– recognize and interpret the nominal characteristics,
– know how to use and assemble electrical circuits.
-Determining the resonant frequency of circuits with inductors and capacitors
-Calculating the quality factor of a network
-Determining the bandwidth of a network
-Using the techniques of frequency and magnitude scaling.
-Learning the distinction between single-phase and polyphase systems
-Becoming familiar with working with both Y- and -connected three-phase sources
-Becoming familiar with working with both Y- and -connected networks
-Mastering the technique of per-phase analysis of three-phase systems
-Determination of the characteristic damping factor and resonant frequency for both series and parallel RLC circuits
-Calculation of the complete (natural plus forced) response of RLC circuits

Frequency Response. Parallel Resonance. More about Parallel Resonance. Series Resonance. Other Resonant Forms. Scaling

Polyphase Circuits. Polyphase Systems. Single-Phase Three-Wire Systems. Three-Phase Y-Y Connection. The Delta Connection. Power Measurement in Three-Phase Systems.

Transient response of basic circuits
RL circuits. RL circuits under DC supply. RL circuits under AC supply. Applying the continuous flux linkage law to L circuits. RC circuits. Discharging and charging a capacitor. RC circuits under DC supply. RC circuits under AC supply. Applying the continuous charge law to C-circuits. The applications of the unit-step forcing function. RLC circuits. RLC circuits under DC supply.
(a) Series connected RLC circuits. (b) Parallel connected RLC circuits. (c) Natural response by two nonzero initial conditions.
RLC circuits under AC supply. Transients in RLC resonant circuits. (a) Switching on a resonant RLC circuit to an AC source.
(b) Resonance at the fundamental (first) harmonic. (c) Frequency deviation in resonant circuits. (d) Resonance at multiple frequencies. Switching off in RLC circuits. (a) Interruptions in a resonant circuit fed from an AC source.

NAO

Sadiku, M. N., Alexander, C. K., & Musa, S. (2014). Análise de circuitos elétricos com aplicações. AMGH Editora., Science Engineering & Math; McGraw-Hill Higher Education, 1 edition (1 July 2012). ISBN-13: 978-0071317825.

Hayt Jr, W. H., Kemmerly, J. E., & Durbin, S. M. (2014). Análise de Circuitos em Engenharia-8. AMGH Editora.

Nahvi, M., & Edminister, J. A. (2014). Circuitos Elétricos-5. Bookman Editora.

Matias, J. V. C. (2005). Tecnologias da Electricidade–Vol. II. Didáctica Editora.

Alexander, C. K., & Sadiku, M. N. (2013). Fundamentos de circuitos elétricos. AMGH Editora.

Eide, A. R., Jenison, R. D., Mickelson, S. K., & Northrup, L. L. (2018). Engineering fundamentals and problem solving. McGraw Hill Education.
Johnson, D. E., Hilburn, J. L., & Johnson, J. R. (1994). Fundamentos de análise de circuitos elétricos. Livros Tecnicos e Cientificos.

Silva Junior, P. P. D. (2019). Circuitos elétricos: uma análise comparativa entre teoria e prática.

Salvador, A. I. N. (2017). O Ensino e a Aprendizagem dos Circuitos Elétricos: utilização de Analogias e da Resolução de Problemas (Doctoral dissertation, 00500:: Universidade de Coimbra).