78566 - Design and Diagnostics of Electrical Insulation Systems M

Course Unit Page

Academic Year 2018/2019

Learning outcomes

The course aims to provide in-depth knowledge on the use of the main solid, liquid and gaseous electrical insulators in the components of medium and high voltage electrical power systems. At the end of the course the student is able to design and qualify the electrical insulating systems in DC and AC, e.g. high voltage cables, isolators, rotating machines, transformers and GIS. He is also able to apply the main diagnostic techniques to evaluate the aging state of the above-mentioned insulating systems.

Course contents

Part I - Design of electrical insulation

1) Recall on the main solids, liquids and gasses

2) Conduction mechanisms in insulations

3) Life models for single, combined, phenomenological and probabilistic stresses.

4) Design criteria for HVAC and HVDC electrical insulation systems
4.1) HVAC and HVDC cables
4.2) Field grading
4.3) Capacitors
4.4) Bushings 

Part II - Diagnostics of Insulation Systems

1) Aging of insulators. Bulk and local diagnostics.

2) Electric response of a dielectric

3) Partial discharges

4) Health index: main diagnostic techniques for assessing the status of electrical components.

Teaching methods

The course consists of front lessons, computer and laboratory exercises.

Assessment methods

Achievements will be assessed by the means of a final exam. This is based on an analytical assessment of the "expected learning outcomes" described above.

In order to properly assess such achievement the examination consists of an oral session with 3 questions on topics of the course, to ascertain the knowledge of the student and the ability to apply such knowledge in simple practical problems.

The first question is a written theme that needs to be done in 1 hour without the help of notes or books. The other two questions asked by the teacher are discussed orally.

Higher grades will be awarded to students who demonstrate an organic understanding of the subject, a high ability for critical application, and a clear and concise presentation of the contents.

To obtain a passing grade, students are required to at least demonstrate a knowledge of the key concepts of the subject, particularly regarding protections against indirect and direct contacts in electic distribution networks, some ability for critical application and an acceptable use of technical Language.

A failing grade will be awarded if the student shows knowledge gaps in key-concepts of the subject, in particular on design and diagostic methods of electrical insulation systems, as well as inappropriate use of language, and/or logic failures in the analysis of the subject.

Teaching tools

Copy of the slides displayed at lectures will be provided to the students on Online Teaching. Look at the link on didactic material.

Office hours

See the website of Davide Fabiani