LEARNING OUTCOMES

The course is aimed to supply fundamental acquaintances and mathematical instruments for the study and the analysis of the electric circuits in direct current and alternating current domain; the electrical motors, the power electronic system, the electrical drives and the energy power systems.

TEACHING METHODS

The course mainly develops through frontal lessons with computer and audiovisual aids. Moreover sessions of exercises carried out in classroom are prvided.  The students who attend the course must record themselves to the site AulaWeb, enrolling themselves to the course. In such a way they will have access to didactic material of the course, will receive via email communications of the teacher and will have access to the results of the written tests.

For the development of the exercises in classroom, 2 hours weekly will be scheduled, in preparation of the practical tests, to leave, indicatively, from the second week of October.

SYLLABUS/CONTENT

Circuits

1. Introduction – Electrical power transmission -  Electrical generators, electrical users, Electrical lines.
2. Electromagnetic phenomena: General approach to the solution of the electromagnetic problems - Electric charge - Electrical current - Conductors - Continuity Law - Measure of the electrical current: ammeter - Electric field – Electric Voltage - Measure of the electric voltage: voltmeter.
3. Electrical Conduction:  Ohm’s  and Joule’s Laws  - Electrical resistivity and conductivity - Conductors of generic form - Bipolar resistor - Characterization of a bipolar resistor.
4. Electrical  Generators: Introduction – Behaviors of generators in open circuit - Behavior of generators with loads - Energy balance of generators – Electrical generators types.
5. Bipolar devices and energy balance: Introduction – Equations of bipolar devices – Special bipolar devices  (short circuit and open circuit) – Rate of electrical energy  - Measure of the electrical power: wattmeter.
6. Electrical network Properties: Introduction - Regime of operation (stationary, variable, transitory) - Analysis of the electrical networks - Topology of the networks - Kirchhoff’s  Laws – Network analysis methods.
7. Steady state analysis: Introduction – Bipolar devices connected in series – Series connection of an ideal voltage generator  and a resistor - Resistors in series: equivalent resistance – Bipolar devices connected in parallel - Parallel connection of an ideal current generator and a resistor - Resistors in parallel: equivalent conductance - Network of resistors: equivalence concept - Star-delta transform – Steady-state analysis Methods  - Superposition method – Maxwell’s method  - Network reduction - Substitution Theorem – Thevenin’s transform – Norton’s transform – Millmann’s  Formula – Power matching - Maximum power transfer.
8. Dielectric phenomena – Capacitor : Introduction – Gauss’s Law - Capacitor – Parallel-plate capacitor- Bipolar  capacitor – Capacitor  in steady-state regime  - Capacitor  in transient regime - electrostatic Energy - Series and parallel of capacitors - Displacement current.
9. Magnetic phenomena - Inductor: Introduction - Magnetic materials - Ferromagnetic materials - magnetic Induction - Faraday-Neumann’s Law - Inductors – Inductor coils - Mutual inductors – Bipolar inductors  and two port inductors - Inductors in steady-state regime - Inductors in transient regime - Magnetic energy - Series and parallel of inductors.
10. Sinusoidal steady-state networks: Introduction – Sinusoidal quantities: Phasors and sinusoids – Phasors graphical operations - generalized Ohm’s Law  - Impedance – Sinusoidal steady-state network analysis – Thevenin’s and Norton’s  transforms - Power balance in steady-state sinusoidal regime (average power, reactive power, complex power) - Measuring instruments in a.c.
11. Three-phase network analysis: Introduction - symmetrical three-phase  voltages - Phase and line voltages – Three-phase balanced load – Currents in three-phase networks – Balanced load analysis – Single-phase equivalent - Powers in balanced three-phase systems.
12. Magnetic circuits: Introduction - Reluctance – Ferromagnetic materials - Air gap - Magnetic  circuit’s Laws - Network analysis of magnetic circuits.

Electrical machines

1. Transformers: Single-phase transformers - Equivalent circuit of the transformer – No-load (open-circuit) and short circuit tests – Power transformer on load - Three-phase transformers - Equivalent circuit of the three-phase transformer.
2. Induction machines: Basic principles of a three-phase induction machine – Action of a three-phase induction machine - Simplified equivalent circuit - Speed-torque Characteristics – Starting of induction motors -  Induction machine acting as generator.
3. Synchronous Machines: Constructional features – Basic principles – No-load characteristics of a synchronous machine - Synchronous machine on load - Equivalent circuit of the synchronous machine - Electromechanical behavior.

RECOMMENDED READING/BIBLIOGRAPHY

Written support are available on-line on AulaWb site. There are various folder, where:

in folder "appunti del corso" are available for download pdf copies of teaching slides.

in folder "esercitazioni" are available for download pdf copies of solved exercises.

in folder "risultati delle prove scritte" are available for download pdf copies of past written exams.

It is also useful consulting of following books available from school CBA:

M. Guarnieri, A. Stella: “Principi ed applicazioni di Elettrotecnica (volume primo)”, Edizioni Libreria Progetto Padova.

C. K. Alexander, M.N.O. Sadiku: “Circuiti elettrici”, McGraw-Hill, ISBN 88 386 0853-9.

C. A. Desoer, S. Kuh: “Fondamenti di teoria dei circuiti”, Franco Angeli Editore, Collana di Ingegneria Elettrica.