Lecturer: Francesco Benzi   Mario Montagna  

Course name: Introduction To Power Systems And Electrical Machines
Course code: 504058
Degree course: Ingegneria Industriale, Ingegneria per l'Ambiente e il Territorio
Disciplinary field of science: ING-IND/33
L'insegnamento è caratterizzante per: Ingegneria Industriale
The course relates to: Ingegneria Industriale
University credits: ECTS 9
Course website: n.d.

Specific course objectives

Acquisistion of the basic techniques for the analysis and design of electrical distribution and utilization systems with particular reference to the following topics: sizing of lines (overhead and cable), protection of lines against overload and short-circuit.

Course programme

1. Medium and Low Voltage Distribution Systems
Network structure. Calculation of electric lines; approximate formulas of the voltage drop on short lines, design and analysis calculation by the principle of the maximum admissible voltage drop.

2. Thermal Phenomena in Electrical Lines
Equations of heat transmission. Current rating of lines with bare conductors. Current rating of lines with insulated conductors (cables). Line sizing by the thermal criterion. Classification and structure of electrical cables. Current rating of low-voltage cables; air or underground installation according to the CEI-UNEL tables. Operation of lines (overhead and cables) in overload and short circuit conditions.

3. Switchgears
Classification and definitions. Notes on the mechanism of the interruption of electrical currents. Characteristics of circuit breakers, disconnectors and contactors. Circuit breakers. Circuit breakers with residual current device.

4. Low Voltage Lines Protection
Overcurrent protection, thermal relay, electromagnetic relay, thermal magnetic protection. Circuit breakers. Fuses. Protection of lines against overload and short circuit.

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): 60
Practical class (hours/year in lecture theatre): 15
Practicals / Workshops (hours/year in lecture theatre): 0

Suggested reading materials

G. P. Granelli. Dispense di Impianti Elettrici.

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

Comitato Elettrotecnico Italiano.. Norme CEI 64-8, CEI-UNEL.

Testing and exams

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