AIMS AND CONTENT

LEARNING OUTCOMES

This teaching unit aims to provide elements on the morphology of rotating electrical equipment for low and high voltage. It is also proposed to supply the elements for the preliminary design of rotating electrical machines and the elements for the diagnosis of electromechanical components

AIMS AND LEARNING OUTCOMES

Students are expected to develop a sound understanding of the fundamental design principles of rotating electrical machines. Particular attention is devoted to the morphology and construction of stators and rotors, as well as to the design and classification of windings and electrical insulation systems for both low-voltage and high-voltage machines. The course is intended to provide students with the knowledge required to recognize the main structural and functional features of rotating machines and to understand their role in the preliminary design process.

Furthermore, students are expected to gain knowledge of the principles of maintenance of electrical equipment through predictive diagnostic techniques aimed at the early detection of failure conditions. Particular emphasis is placed on proactive and predictive maintenance strategies based on measurements associated with insulation systems, especially partial discharge measurements. Students are also expected to understand the implementation of digital measurement techniques for the acquisition of partial discharge patterns and the application of statistical analysis to the acquired data for the morphological identification of defects.

TEACHING METHODS

The Electrical Machines and Design part comprises 25 hours of theoretical classroom lectures and 10 hours of practical sessions devoted to the preliminary design of rotating electrical machines.
The Diagnostics part comprises 20 hours of classroom teaching and 5 hours of laboratory activities.

tudents with valid certifications for Specific Learning Disorders (SLDs), disabilities, or other special educational needs are invited to contact the instructor and the School’s Disability Coordinator at the beginning of the course to agree on any appropriate teaching arrangements which, while respecting the learning objectives of the course, take into account individual learning needs.

The contact details of the School’s Disability Coordinator are available at the following link: University Committee for the Inclusion of Students with Disabilities or SLDs | UniGe | University of Genoa

SYLLABUS/CONTENT

Review of insulation systems and insulating materials. Review of the stresses affecting insulation systems and of their degradation mechanisms. Review of the operating principles of rotating electrical machines. Dimensional relationships for rotating electrical machines. Main aspects of machine design. Machine constants for rotating electrical machines.

Rotating electrical machines: types and constructional forms according to their operating principle. Stators and rotors of salient-pole synchronous machines. Morphology of turbo-generators. Air-, hydrogen-, and demineralized-water cooling systems. Hydrogen sealing systems. Basic classification of windings. Concentrated windings, concentrated windings distributed in slots, cage windings, open distributed windings, and short-pitch windings. Introduction to fractional-slot windings. Insulation systems for wire windings, strip conductors, and preformed bars. DIP, VI, VPI, GVPI, and Resin Rich impregnation systems.

Preliminary design of a high-voltage rotating machine: theory and calculations.

Proactive, preventive, and predictive maintenance. Failure modes of transformers and rotating machines. Failure analysis and Ishikawa diagrams. Detailed examples of Ishikawa diagrams for different failure types in rotating machines. Conventional offline diagnostic techniques for insulation systems. Online and offline diagnostic techniques for the stator and rotor windings of synchronous and induction machines.  Partial discharge phenomena. Partial discharge measurement as a diagnostic tool for predictive maintenance. Low- and high-frequency partial discharge measurement systems for conducted and radiated signals. Integration in the time and frequency domains. Sizing of measuring impedance for quasi-integration. Analog and digital measurement systems. Analysis of analog signals for defect identification. Data analysis in digital measurement systems. Fundamentals of statistics. Data processing for defect recognition using digital measurement systems. Defect classification and assessment of severity. Measurement systems for inverter-fed applications.

Laboratory activities on partial discharges measurement.

RECOMMENDED READING/BIBLIOGRAPHY

Lecture notes

DESIGN OF ROTATING ELECTRICAL MACHINES, Juha Pyrhonen, Tapani Jokinen, Valeria           Hrabovcova editore Willey

IEC Standards

TEACHERS AND EXAM BOARD

LESSONS

LESSONS START

Information on the academic calendar is available at the following link:
https://corsi.unige.it/corsi/11955/studenti-orario 

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

Oral exam with possible pratical activity on PD measurements

ASSESSMENT METHODS

The assessment consists of an oral examination based on three questions, one of which focuses either on calculations related to the preliminary design of rotating electrical machines or on the laboratory activities concerning partial discharge measurements. The candidate must demonstrate knowledge of the subject by correctly answering the questions asked by reasoning on the covered topics

FURTHER INFORMATION

Ask the Professor for other information not included in the teaching unit description.