OVERVIEW

The course aims to provide the elements for the morphological study of different types of rotating machines. In particular, the elements for the dimensional calculation of a synchronous generator are provided. Diagnostic methods for different types of maintenance are also analysed. In particular, diagnostic methods are studied based on the measurement of partial discharges. These methods are applied not only to rotating machines but to all electrical equipment for low medium and high voltage.Practical activities in the laboratory allow you to apply the theoretical treated elements.

AIMS AND CONTENT

LEARNING OUTCOMES

Know the technological solutions for the construction of rotating machines both from the morphological and the functional point of view. Know how to define the preliminary design of rotating electric machines. Identify incipient fault conditions in electrical equipment.

AIMS AND LEARNING OUTCOMES

To provide the elements on the morphology of rotating electrical equipment for low and high voltage. To provide the elements for the preliminary sizing of rotating electric machines. Provide elements for the diagnostics of electromechanical components

TEACHING METHODS

54 hours lessons 16 calculus 20 pratical exercitations in laboratory

SYLLABUS/CONTENT

Recalls on stress and degradation of insulation systems. Recalls on the principles of operation of rotating electric machines. Dimensional relations for rotating electric machines. Main aspects of a project. Constants of rotating machinery.        

Rotating machines. Type and construction forms according to the principle of operation. Stators and rotors of the synchronous machines with salient poles. Morphology of the turbo-alternators. Air, hydrogen and demineralized water cooling systems. Hydrogen sealing systems. Notes on the classification of windings. Concentrated coils, concentrated coils distributed in slots, squirrel cage coils, open distributed coils, short-pitch coils. Outlines of fractional slots windings. Insulation systems for round wire, rectangular wires and preformed bars. Impregnation systems:  VI, VPI, GVPI and resin reach.

Morphology and sizing of electrical cables for MV and HV. Cable junctions and terminations. Electrical field grading systems.

Recalls on insulating systems and insulating materials. Proactive, preventive and predictive maintenance. Types of failure of transformers and rotating machines. Fault analysis and Ishikawa diagrams. Examples of detailed Ishikawa diagrams for different types of rotating machine failure. Conventional offline diagnostic techniques on insulation systems. Mechanical and electrical measures for bearing diagnostics in rotating machines. Online and offline diagnostic techniques related to stator and rotor windings of synchronous and asynchronous machines. Online and offline diagnostic techniques related to insulating systems of oil and cast resins transformers. The phenomenon of partial discharges. Measurement of partial discharges as a diagnostic tool for predictive maintenance. Low and high frequency partial discharge measurement systems for conducted and irradiated signals. Integration into the time and frequency domain. Design of the measurement impedance for quasi-integration. Analog and digital PD measurement systems. Analog signal analysis for defect detection. Data analysis in digital measurement systems. Statistical outlines. Data processing for defect detection with digital measuring systems. Defect classification and degree of hazard. Measurement systems in the case of inverter power supplies.

RECOMMENDED READING/BIBLIOGRAPHY

Notes of the Course

Costruzione delle Maccchine Elettriche, Giovanni Someda, editore Patron

Costruzioni Elettromeccaniche, Enrico di Pierro, editore Siderea

Design of rotating electrical Machines, juha Pyrhonen et alt. juha

Electrical insulation for rotating Machines, Greg C. Stone et alt, IEEE PRESS

IEC standards

TEACHERS AND EXAM BOARD

Exam Board

FRANCESCO GUASTAVINO (President)

LAURA DELLA GIOVANNA (President Substitute)

EUGENIA TORELLO (President Substitute)

LESSONS

LESSONS START

https://corsi.unige.it/8731/p/studenti-orario

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

Oral

Exam schedule