Aims and Scope

The course aims to introduce students to the structure and operation of transformers, synchronous generators and motors. The objective is to acquire the necessary theoretical background, get familiar with the required calculations for the study of critical operational parameters of these machines and understand the impact of these parameters on their control and operation. Also, the various applications of these machines in energy systems or other installations (industrial, commercial etc.) are introduced.

Course Description 

Theoretical course

Review of the fundamental concepts and laws of electric and magnetic field and introduction to the properties and behavior of ferromagnetic materials. Measurement and power transformers, mathematical analysis, equivalent circuit, laboratory tests, operation, performance. Power transformer loading. Autotransformers. Special type transformers. Applications. Introduction to the synchronous polyphase ac machines (generators, motors). Theory of the rotating magnetic field. Modern three-phase machines, structure and types. Excitation systems. Three-phase synchronous generators, mathematical analysis, equivalent circuit, variables, parameters, function, behavior, control and regulation, efficiency and energy saving. Parallel operation of synchronous generators. Stability and transients. Use of generators in power plants. Synchronous ac motors, mathematical analysis, equivalent circuit, variables, parameters, function, behavior, control, starting, braking efficiency and energy savings. Using motors in electromechanical energy conversion applications with special reference to large systems.

Laboratory course

The laboratory part of the course comprises exercises in implementing standardized measurements and tests in transformers, and modern three-phase AC synchronous generators and motors.

Expected Course Outcome

After the end of the course students will be able to:

·         Understand the theoretical principles of the technology of transformers and modern electrical machines.

·         Apply this knowledge in the study and analysis of the operation of transformers and modern synchronous ac generators and motors in a wide range of applications.

Bibliography

Greek:

1.  Stephen J. Chapman, "Ηλεκτρικές Μηχανές DC - AC", Εκδόσεις McGcraw-Hill / A.Τζιόλα, 2001.

2. Γ. Ξυπτεράς, "Ηλεκτρικές Μηχανές, Σύγχρονες Μηχανές", Εκδόσεις Ζήτη 1997.

3.  Α.Ν. Σαφάκας, "Ηλεκτρικές Μηχανές Β", Πάτρα 1984.

4.  Ι.Α. Τεγόπουλος," Ηλεκτρικές Μηχανές", Μέρος Β, Εκδόσεις Συμμετρία.

5.  Charles I. Hubert, «Ηλεκτρικές Μηχανές», Εκδ. Ίων, 2008.

English:

1. Charles A. Gross, “Electric Machines“, CRC 2006.

2. Stephen Chapman, “Electric Machinery Fundamentals (McGraw-Hill Series in Electrical and Computer Engineering)“, McGraw-Hill, 2003.

3. Charles I. Hubert, “Electric Machines: Theory, Operating Applications, and Controls (2nd Edition)”, Prentice Hall, 2001.

4. Bhag S. Guru and Huseyin R. Hiziroglu, “Electric Machinery and Transformers (The Oxford Series in Electrical and Computer Engineering)“, Oxford University Press, 2000.