- Docente: Andrea Cavallini
- Credits: 6
- SSD: IIND-08/B
- Language: English
- Teaching Mode: In-person learning (entirely or partially)
- Campus: Bologna
- Corso: Second cycle degree programme (LM) in Electrical Energy Engineering (cod. 6714)
Learning outcomes
At the end of the course, the student can choose the most appropriate diagnostic techniques for an electrical insulation system and is able to start using the techniques, interpreting measurement results. He knows (a) the typical failure modes of high and medium voltage equipment; (b) the diagnostic techniques most used to identify local defects (weak points in the insulation systems) and bulk degradation, their limitations and interpretation.
Course contents
- Structure and properties of polymers
- Paper/oil insulated systems.
- Phenomenological aging models
- Electrodes (coaxial cylinders and concentric spheres, point/plane electrodes, emission of electrons from metal electrodes). Carbon black,
- Conduction mechanisms in dielectrics.
- Polarization and dielectric response.
- Discharges in gases (ionization and attachment coefficients, discharges in uniform field, Paschen's law, discharges in divergent fields, streamer inception criterion)
- Breakdown of liquid dielectrics: discharges in uniform and divergent electrical fields.
- Breakdown of solid dielectrics (intrinsic breakdown, electro-mechanical breakdown, thermal runaway, tracking)
- Partial discharges: physics, treeing.
Readings/Bibliography
Slides and notes provided by the teacher.
The documents are available for download on IOL.
Teaching methods
About 30% of the course consists of lab experiences.
Assessment methods
Oral examination
Teaching tools
The high voltage equipment in the lab. of innovation technology will be used to show how to use diagnostic systems.
Office hours
See the website of Andrea Cavallini
SDGs
This teaching activity contributes to the achievement of the Sustainable Development Goals of the UN 2030 Agenda.