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Politecnico di Torino
Academic Year 2016/17
01BGAMH
Electrical Systems
1st degree and Bachelor-level of the Bologna process in Building Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Pons Enrico   A2 ING-IND/33 42 18 0 0 7
SSD CFU Activities Area context
ING-IND/33 6 C - Affini o integrative Attività formative affini o integrative
Subject fundamentals
The main objective of the course is to provide the students with the fundamental laws of electrotechnics, electrical safety, and power systems in buildings and in construction and demolition site installations.
After considering the main components, the course will present the basic techniques for threephase systems, in normal state and after faults and the problems of protections against overcurrents and overvoltages. Part of the course is dedicated to the general safety concepts and their application to electrical plants, including the main references to the most significant legislation and standards for electrical safety and to the prevention techniques.
Expected learning outcomes
Acquisition of theoretical and experimental skills in electrotechnics, fundamentals of electrical safety and critical understanding of their laws; ability to solve electrical circuits; ability to apply laws and theorems to practical situations. Ability to understand and interpret the structure and operation of electrical installations in High Voltage, Medium Voltage and Low Voltage systems, modelling the main components to study the operating conditions in normal state and after faults. Knowledge of the basic concepts on the interruption of the electric current and on the selection of the protection against overcurrents and overvoltages.
Ability to interpret and apply the concepts referred to safety and the related standards and regulatory documents.
Knowledge of the basic concepts of the design of user power plants, with ability to define basic scheme, to size the components in function of operating requirements and of the possible occurrence of anomalous events (short circuits and overvoltages), to identify the protections types and settings applying the relevant standards
Prerequisites / Assumed knowledge
The students are assumed to know the topics covered by the course of Mathematical Analysis I and Physics I, in particular the use of differential and integral calculus and the basic knowledge of electrical and magnetic fields. Further prerequisites are notions of complex numbers and a basic knowledge of vector calculus.
Contents
Basic definitions: electrical components and terminals, two-terminal components; current and voltage; passive and active sign convention; electrical power and energy; Kirchhoff’s current and voltage law
Two-terminal components and constitutive equations: constitutive equations of resistor, capacitor, inductor, voltage and current generator
Solution of the fundamental problem of circuit theory: definition; linearly independent equations: KCL, KVL constitutive equations
Special methods for the solution of electrical circuits: series and parallel connection of resistors and generators; current and voltage division; star and delta connection; superposition principle; Thevenin equivalent circuit.
Sinusoidal steady state. (summary of complex number algebra); sinusoidal waveforms; phasor of a sinusoidal waveform; property of phasors; topological and constitutive equations in phasor domain; impedance, admittance and generalized Ohm’s law; generalization of principles and theorems in phasor domain; power in sinusoidale steady state; Boucherot’s law; power factor correction of inductive single-phase loads.
Three-phase circuits: definition: balanced and unbalanced three phase circuits, line (line-to-line) phase (line-to-neutral) voltages; star and delta connected loads; series and parallel connection of loads; single phase equivalent circuit; power factor correction: star and delta connection of capacitors
Trasformer: working principle; single phase transformer; three phase transformer.
Power systems definitions: TN systems, TT systems, IT systems.
Protection against overcurrent: Nature of protective devices; Protection against overload current; Protection against short-circuit current.
Protection against direct contact: Degrees of protection provided by enclosures (IP Code)
Protection against indirect contact: Protective measure: automatic disconnection of supply; Functional extra-low voltage (FELV); Protective measure: double or reinforced insulation; Requirements for basic protection and fault protection; Protective measure: electrical separation; Protective measure: extra-low-voltage provided by SELV and PELV; Requirements for basic protection and fault protection; Sources for SELV and PELV; Requirements for SELV and PELV circuits.
Additional protection: Residual current protective devices (RCDs); Additional protection: supplementary protective equipotential bonding.
Requirements for special installations or locations: Locations containing a bath or shower - Zone classification; Construction and demolition site installations
Protection against lightning: Effects of lightning on a structure; Sources and types of damage to a structure; Risk assesment.
Delivery modes
1. Kirchhoff’s current law and Kirchhoff’s voltage law. Constitutive equations. General solution of electrical circuits.
2. Calculus of equivalent resistance
3. Sinusoidal circuit analysis with symbolic method.
4. Sinusoidal circuit analysis with Boucherot law
5. Threephase circuits analysis
6. Protection against overcurrents.
7. Ground resistance measurement. Measurement of soil resistivity, touch and step voltage.
8. Protection against indirect contacts in TT systems.
9. Protection against indirect contacts in TN systems. Loop fault impedance measurement.
10. Protection against lightning: risk assessment.
Texts, readings, handouts and other learning resources
Appunti dalle lezioni e materiale distribuito dal docente (disponibile sul portale della didattica).
M. Repetto, Elettrotecnica, Politeko (disponibile sul Portale della Didattica)
A. Canova, G. Gruosso, B. Vusini, Lezioni di Elettrotecnica, Progetto Leonardo
R.C. Dorf, J.A. Svoboda, Circuiti Elettrici, Apogeo
C.K. Alexander, M.N.O. Sadiku, Circuiti elettrici, McGraw-Hill
A. Canova, G. Gruosso, M. Repetto, Elettrotecnica: Esempi ed Esercizi, Politeko
Raccolta Temi d’Esame (disponibile sul Portale della Didattica)
F. Piglione, G.Chicco, Sistemi elettrici industriali. Parte II: Macchine e impianti elettrici, Politeko, Torino, 2007.
V. Carrescia, Fondamenti di sicurezza elettrica, edizioni TNE, Torino, 1997.
D. Di Giovanni, La sicurezza degli impianti elettrici, edizioni CEI, Milano, 2006.
Assessment and grading criteria
The final evaluation will be made with a written examination (25-30 quiz with multiple choices questions and 4-5 exercises). Each exact answer is evaluated in the range 0,5-3 points. The score of the test depends either on the clarity of the exposition.

The test duration takes approximately 60-90 minutes to complete.

During the test the students can use a calculator but they can’t read books or their notes.

However, an oral colloquium can be request by the teacher or by the students.

Programma definitivo per l'A.A.2016/17
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