Lecturer: Mario Montagna  

Course name: Electrical Power Systems A
Course code: 502586
Degree course: Ingegneria Elettrica
Disciplinary field of science: ING-IND/33
University credits: ECTS 6
Course website: n.d.

Specific course objectives

Acquisition of complementary notions of electrical systems with particular regard to three-phase systems. Acquisition of basic knowledge on the structure and component models of electric power systems. Acquisition of the theory of short-circuit current calculation; introduction to the calculation of the power flows in electrical systems.

Course programme

1. Basic Electrical Circuits and the Three-Phase System
Electrical circuits in sinusoidal steady state. Three-phase systems and the method of symmetrical components. Theorems on power grids. The method of relative (per unit) values for networks including transformers.

2. General Topics
Classification and structure of electrical power plants. Notes on the generation facilities and high-voltage transmission networks, primary distribution, medium and low voltage distribution. Notes on the electrical plants in the industrial and civil field.

3. Main Components of the Electrical Plants
Characteristics of overhead power lines and cables: construction types, choice of insulation and of the conductor material, calculation of the fundamental constants. Synchronous machines and transformers: basic construction, principle of operation, main characteristics, mathematical models. Notes on switchgear devices and protection.

4. Short-circuit Currents
Study of the three-phase networks using the method of symmetrical components. Sequence impedances for synchronous machines, transformers, lines; sequence networks. Calculation of symmetrical three-phase short-circuit currents. Calculation of dissymmetric short-circuit currents. Notes on the choice of the circuit breakers. Neutral and earthing conditions in three-phase systems, short-circuit currents and over-voltages.

5. Power flows in Electrical Systems
General equations of the networks in steady-state operation. Introduction to the calculation of power flows in transmission systems; notes on the various methods of solution (Gauss-Seidel, Newton-Raphson, decoupled and fast-decoupled load flow), direct current (DC) load flow.

6. Tutorials Topics
Solution of single and three-phase circuits. Application of the per-unit method to the study of electrical networks including transformers. Calculation of short-circuit currents in symmetric and dissymmetric conditions; application of the CEI 11-25 standard to the calculation of short circuit currents. Load flow calculations.

Course entry requirements

Basic knowledges provided by the courses of: Calculus I and II, Geometry and Algebra, Physics, Electrical Circuits.

Course structure and teaching

Lectures (hours/year in lecture theatre): 40
Practical class (hours/year in lecture theatre): 12
Practicals / Workshops (hours/year in lecture theatre): 0

Suggested reading materials

G. P. Granelli. Dispense di Fondamenti di Impianti Elettrici.

G.P. Granelli, M. Montagna. Fondamenti di Impianti Elettrici vol. I. Cisalpino - Istituto Efitoriale Universitario.

N. Faletti, P. Chizzolini. Trasmissione e distribuzione dell'energia elettrica, 2 volumes. Pātron Editore.

F. Iliceto. Impianti Elettrici, Volume I. Pātron Editore, Bologna.

V. Medved, R. Schinco. Le correnti di corto circuito negli impianti elettrici AT, MT e BT. Editoriale Delfino, Milano.

Comitato Elettrotecnico Italiano. Norme CEI 11-1, 11-25, 64-8.

Testing and exams

The exam consists of a single written test on all topics of the course.