First cycle
degree courses
Second cycle
degree courses
Single cycle
degree courses
School of Engineering
Course unit
INP9087238, A.A. 2019/20

Information concerning the students who enrolled in A.Y. 2019/20

Information on the course unit
Degree course Second cycle degree in
IN1979, Degree course structure A.Y. 2014/15, A.Y. 2019/20
bring this page
with you
Number of ECTS credits allocated 6.0
Type of assessment Mark
Department of reference Department of Industrial Engineering
E-Learning website
Mandatory attendance No
Language of instruction English
Single Course unit The Course unit can be attended under the option Single Course unit attendance
Optional Course unit The Course unit can be chosen as Optional Course unit


ECTS: details
Type Scientific-Disciplinary Sector Credits allocated
Core courses ING-IND/33 Electrical Energy Systems 6.0

Course unit organization
Period First semester
Year 1st Year
Teaching method frontal

Type of hours Credits Teaching
Hours of
Individual study
Lecture 6.0 48 102.0 No turn

Start of activities 30/09/2019
End of activities 18/01/2020
Show course schedule 2019/20 Reg.2014 course timetable

Examination board
Examination board not defined

Prerequisites: Impianti elettrici, enertronica.
Target skills and knowledge: This course aims at giving students the physical core concepts on which the modern high voltage transmission systems in alternate current (HVAC) and in direct current (HVDC) are based from the design and management standpoints.
Examination methods: Written examination
Assessment criteria: Knowledge of the methodologies and technologies explained during the course;

Comprehension of the physical principles behind the studied methodologies and technologies;

Ability to apply the learned methodology to specific cases.
Course unit contents: 1) Insulated cables

• recall of the dielectric loss phenomena;
• electric field distribution in HVAC and HVDC insulated
cables: the reverse field phenomenon;
• fundamental concepts of VSC and LCC HVDC system
• recall of reliability, availability and failure rate
• discharge mechanisms in solid insulations;
• external effects of phase-to-screen short circuits in
power insulated cables;

2) Gas insulated lines and substations

• electric discharge formation in gaseous insulations:
basic concepts and main parameters;
• SF6 and SF6 mixture insulated systems: design criteria
on the basis of the applied voltage;
• external effects of phase-to-screen short circuits in
GILs and design criteria;

3) Installation options for cables and GILs: the synergy between power transmission and railway/highway infrastructures

• the Brenner Pass future interconnection between Italy
and Austria
• the Piedmont-Savoy HVDC-VSC interconnection line
between Italy and France;

4) Overhead lines

• air discharge phenomena in normal conditions and in a
contaminated atmosphere;
• 50 Hz behaviour of ground wires;
• voltage distribution in string and V insulators;
• Innovative OHLs conductors.

5) overvoltages in electrical networks: causes, mechanisms of propagation and overvoltage protection systems;

6) High voltage transmission systems monitoring and diagnostic:

• difference between scheduled and conditioned
• partial discharges: basic concepts of the phenomenon,
measurement techniques and discharge diagrams;
• hints of travelling wave theory;
• monitoring and fault location systems and techniques
for high voltage transmission lines.
• the Dynamic Thermal Rating (DTR)

7) Management of high voltage transmission systems on the basis of the project reliability and availability requirements

• availability assessment approaches for HVAC systems;
• availability assessment approaches for HVDC-VSC
systems by taking into account the required
converter reliability.
Planned learning activities and teaching methods: Front lessons
Additional notes about suggested reading: • Slides supplied by the teacher

• Papers co-authored by the teacher or by the Electric Energy Transmission Laboratory i.e.

R. Benato, E. M. Carlini, C. Di Mario, L. Fellin, A. Paolucci, R. Turri: Gas Insulated Transmission Lines in Railway Galleries, IEEE Trans. on Power Delivery, Vol. 20, Issue 2, aprile 2005, pp. 704-709.

R. Benato, D. Napolitano: "Reliability Assessment of EHV Gas Insulated Transmission Lines: effect of redundancies", IEEE Trans. on Power Delivery, Vol. 23, Issue 4, ottobre 2008, pp. 2174-2181.

R. Awad (Convenor), C. Peacok (Secretary), R. Benato (Member): "Cable Systems in Multi purpose or Shared Structures", Electra, Vol. 248, febbraio 2010, pp. 31-37.

Benato, R., Dambone Sessa, S., Poli, M., Quaciari, C., Rinzo, G: “An On-Line Travelling Wave Fault Location Method for Unearthed-Operated High Voltage Overhead Line Grids”, IEEE Transactions on Power Delivery, Vol. 33, Issue 6, 2018

R. Benato, D. Napolitano: "State-space model for availability assessment of EHV OHL–UGC mixed power transmission link", Electric Power Systems Research 99 (2013), pp. 45– 52, doi: 10.1016/j.epsr.2013.02.004.

R. Benato, S. Dambone Sessa, F. Guglielmi, R. De Zan, A. Gualano, L. Guizzo, M. Rebolini: "Linee elettriche in infrastrutture stradali/ferroviarie: un utilizzo affidabile delle sinergie", L'Energia Elettrica 1/91, gennaio-febbraio 2014, pp. 49-62.

R. Benato, S. Dambone Sessa, L. Guizzo, M. Rebolini: “The synergy of the future: high voltage insulated power cables and railway-highway infrastructures”, IET Generation, Transmission & Distribution, Vol. 11, Issue 10, pp. 2712 – 2720, DOI: 10.1049/iet-gtd.2016.2082.


Andreas Küchler: “High Voltage Engineering, Fundamentals-Technology-Applications”, Springer.

G. Mazzanti, M. Marzinotto: “Extruded cables for high-voltage direct-current transmission” IEEE press.

R. Benato, A. Paolucci: EHV AC Undergrounding Electrical Power. Performance and Planning, SPRINGER, Series: Power Systems Volume 47, ISBN: 978-1-84882-866-7, DOI: 10.1007/978-1-84882-867-4, 2010.
Textbooks (and optional supplementary readings)

Innovative teaching methods: Software or applications used
  • Moodle (files, quizzes, workshops, ...)