Electric machines and transformers

Course title: Electric machines and transformers

Code: FEIT02L003

Number of credits (ECTS): 6

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

Prerequisite for enrollment of the subject: Passed: Fundamentals of Electrical Engineering 1

Course goals/Competences: Introduction to the functioning of electric 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.

Total available number of classes: 180

Curriculum: Introduction in the electromechanical energy conversion. Materials for production of electric machines and transformers. Loss of losses and efficiency. Heating and cooling. Mechanical protection. Loss of life. Application of rotating electrical machines and transformers. Basic electromagnetic phenomena in machines. Equation for induced voltage. Electromagnetic torque. Magnetic voltages and magnetic field in the machine. Armature reaction. DC machines. Regimes of motors and generator. Characteristics of DC machines with different excitation. Balance of power and energy diagram. AC machines. Basic concepts of asynchronous and synchronous machines. Regimes of operation. Asynchronous and synchronous motors and generators. Constructive characteristics. Phasor diagrams and synchronous reactance. Condition for parallel operation. Transformers. Basic concepts of transformers. Types of transformers. Construction - magnetic and electric system. Definition of transformer coefficient. Mathematical model of the transformer. No load and short circuit regimes. Efficiency. Three phase transformers. Vector groups and schematic diagrams. Three winding transformers. Connecting transformers to the network. Monitoring and diagnostics

Literature: