- Docente: Alberto Borghetti
- Credits: 8
- SSD: ING-IND/33
- Language: Italian
- Moduli: Alberto Borghetti (Modulo 1) Fabio Napolitano (Modulo 2) Alberto Borghetti (Modulo 3)
- Teaching Mode: Traditional lectures (Modulo 1) Traditional lectures (Modulo 2) Traditional lectures (Modulo 3)
- Campus: Bologna
-
Corso:
Single cycle degree programme (LMCU) in
Architecture and Building Engineering (cod. 0940)
Also valid for First cycle degree programme (L) in Electrical Engineeing (cod. 0922)
Second cycle degree programme (LM) in Electrical Energy Engineering (cod. 8611)
Learning outcomes
The course provides an introduction to electric power transmission and distribution systems.
Course contents
The course is divided in the following two modules.
A module of 60 hours (Prof. Alberto Borghetti - oral exam)
covers the topics of theory: equivalent circuit of a two-wire line,
external inductance, internal inductance, inductance of a conductor
placed in parallel to a plane conductor and method of images,
introduction to the skin effect, complex depth, skin effect in
circular conductors, matrices of impedances, proximity
effect, forces on conductors, capacity of a two-wire line above the
ground, corona effect and bundle conductors, inductance of a line
with bundle conductors, characteristic impedance and propagation
constant of a two-wire line, direct and reflected waves,
integration of the line equations, speed and wave reflection
coefficient, equivalent circuits of a line, multi-conductor lines,
modal decomposition, balanced line and symmetrical sequences
transformation, overhead line with transposed conductors, status
changes of conductor spans with temperature, insulators,
electric field distribution in the insulator chain, cables, voltage
levels and designation of cables, grounding of the cable shields,
cable constants, thermal behavior of cables and equivalent
electrical circuit, post fault adiabatic regime, Joule integral,
voltage drop in a short line, criteria for selecting the section of
conductors, the electric arc, interruption of alternating currents,
transient recovery voltages, interruption of small inductive and
capacitive currents, different types of circuit breakers and
disconnectors, fuses, protections against short circuits,
connection of the neutral to ground.
The second module of 30 hours (Prof. Fabio Napolitano -
written exam) covers electrical safety and electrical design at low
and medium voltage: physiological effects of electric
current,safetycurrent-time curves, functions of
groundings, earth resistance, touch and step voltages, earth
resistance, equipment with double insulation, masses, direct and
indirect contacts, main and supplementary equipotential protection
by electrical separation, low voltage systems, restricted
conductive areas, differential relays, protection against indirect
contact in medium and high voltage systems, protection against
indirect contact in low voltage systems, calculation of
short-circuit currents at the terminals of three-phase distribution
transformers, unbalanced faults, transient short-circuit
current,the definition of the plant layout, sizing of
electrical conductors in medium and low voltage networks, selection
of the protection as well as coordination, power factor correction
systems, regulatory requirements and standards.
Readings/Bibliography
Lecture notes. Several books and standards on the course topics are also available at the library.
Teaching methods
Assessment methods
The exam is composed by two tests:
- written exam on safety standards and analysis of low and medium
voltage distribution networks;
- final oral exam.
Teaching tools
Links to further information
Office hours
See the website of Alberto Borghetti
See the website of Fabio Napolitano