Electric Machines and Transformers

Course title: Electric Machines and Transformers

Code: 3ФЕИТ02Л007

Number of credits (ECTS): 6

Weekly number of classes: 3+1+1+0

Prerequisite for enrollment of the subject: None

Course Goals (acquired competencies): Acquired knowledge about the principles of operation and operation of electrical machines and transformers. Competence for selection of motors, generators and transformers, according to their place in the power system, and the ability to analyze their characteristics. Knowledge of the methods for testing electric motors, generators and transformers.

Total available number of classes: 180

Course Syllabus: Introduction to electromechanical energy conversion. Materials for electrical machines and transformers. Power losses and efficiency. Heating and cooling. Loss of life.  Basic electromagnetic phenomena in machines. Determination of induced voltage. Electromagnetic torque. Magnetic field in the machines.  DC power machines. Electric motor and generator mode. Characteristics of dc machines with different excitation mode Balance of power and energy diagram.  AC machines. Asynchronous and synchronous generators and motors. Constructive characteristics. Phasor diagrams and synchronous reactances. Parallel operation.  Transformers. Types of transformers. Construction - magnetic and electrical system. Coefficient od transformation. Transformer mathematical model. No-load and short circuit regimes. Three-phase transformers. Winding schemes and vector groups. Three winding transformers.

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