78454 - Electrical Assets Management M

Course Unit Page


This teaching activity contributes to the achievement of the Sustainable Development Goals of the UN 2030 Agenda.

Affordable and clean energy

Academic Year 2021/2022

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

  • Paper/oil insulated systems
  • Power cables: typical failure modes. Global diagnostic tools (dissipation factor, dielectric spectroscopy, dissolved gas analysis). Detection of partial discharges.Water trees and their detection.
  • The electrical insulation system of power transformers: cellulose and mineral oil, and their deterioration due to thermal aging in the presence of catalysts. Techniques for transformer drying. Bulk and local diagnostic techniques for transformer, bushings and on-load tap changers.
  • 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.


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