- 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 knows the basic properties of the dielectrics and the physical mechanisms leading to the breakdown of insulating system composed of either gaseous, liquid, or solid dielectrics or a combination of them. He also knows the weak points of insulation system and how to avoid them in the design phase and through a qualification procedures.
Course contents
- Partial discharge measurement using charge-based and UHF system. Noise rejection and PD source identification.
- Stress control systems.
- The electrical insulation system of power transformers and its deterioration due to thermal aging in the presence of catalysts. Techniques for transformer drying. Bulk and local diagnostic techniques for transformers, bushings, and on-load tap changers.
- Inverter-fed machines: insulation systems, stress factors, partial discharges. Qualification.
- Power cables: typical failure modes. Global diagnostic tools (dissipation factor, dielectric spectroscopy, dissolved gas analysis). Detection of partial discharges. Water trees and their detection.
- Insulation system of rotating machines: resin rich, VPI and global VPI, conductive armor tape, stress control system, bracing systems. Aging mechanisms and typical failure modes. Bulk diagnostic tool and partial discharge detection online and offline.
Readings/Bibliography
Slides and notes provided by the teacher.
The documents are available on IOL for download.
Teaching methods
About 10% 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