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POWER DEVICES AND SYSTEMS ELEC ENG 3PI4 CALENDAR: Power circuits; transformers; magnetic circuits; three phase connections; single phase motors; polyphase machines; synchronous generators and motors; induction motors; dc motors; design of industrial systems. Three lectures, one tutorial, one lab (every other week); second term Prerequisite: ELEC ENG 2CJ4 or 2DA3 Antirequisite: ELEC ENG 3NA3, 3SA3 COURSE OBJECTIVES: To analyse, model, and predict the performance of power devices and systems including single-phase and balanced three-phase systems, transformers, and ac generators and motors. To measure the parameters for these models using standard tests. COURSE LOADING: lectures 3 tutorial 1 laboratory preparation 1 laboratory 1.5 assignments 2 study 3 Total hours per week: 11.5 CEAB WEIGHTING: ES = 60 %, D = 40 % TEXTBOOK: Electric Machinery Fundamentals by Stephen J. Chapman, Chapters 1 - 2 and 7 11, 2nd Edition, McGraw-Hill. DETAILED CONTENT Introduction (5 hours) Review of dc magnetic circuits, magnetomotive force, flux, permeability, reluctance, permeance Review of dc electric circuits, voltage, current, resistance, inductance, capacitance Review of single phase electric circuits, voltage, current, impedance, admittance, power, phase angle, phasor diagrams, node and loop analysis, Kirchhoff's laws Introduction to power concepts, complex power, power factor, power diagrams, single line diagrams, three phase, wye and delta connections Transformers and Magnetic Circuits (7 hours) Reactors and simple magnetic circuits Single phase transformers - exact and approximate equivalent circuits Parameter determination from laboratory test measurements Performance prediction - efficiency, voltage regulation Calculations in SI units, per unit and percent Three phase connections - three phase per unit calculations Three Phase Machines (9 hours) Polyphase stator windings - synchronous/induction action Synchronous generators - load characteristics, voltage regulation Basic synchronous motor characteristics - power factor control Wound-rotor induction motors - approximate equivalent circuit, starting and load characteristics Squirrel-cage rotor design - effect on starting and load characteristics Single Phase Motors (7 hours) Fundamentals of torque development Stepper motors - rotating magnetic field Universal (ac and dc) motors Repulsion and reluctance motors Hysterisis motors, Shaded pole motors Split phase and capacitor motors Introduction to Industrial System Design (5 hours) Professional practice Transformer, motor and supply standards, Matching applications to characteristics Protection - circuit breakers, switches Simple system calculations DC Motors (6 hours) shunt motor load characteristics armature reaction and compounding field and armature voltage control (Total Course = 39 hours) Proposed Laboratories: Actual labs conducted depend on the availability of the resources. Lab 1. The Transformer Goals: measurement of operating characteristics and prediction of performance Lab 2. Universal and Repulsion Motors Goals: measurement of operating characteristics Lab 3. Single Phase Induction Motors Goals: measurement of operating characteristics Lab 4. 3-phase Synchronous Motor Goals: measurement of operating characteristics Lab 5. 3-phase Synchronous Generator Goals: measurement of operating characteristics Lab 6. 3-phase Induction Motor Goals: measurement of operating characteristics and prediction of performance The instructor(s) reserves the right to choose the format (i.e. written or oral) of any deferred midterm or exam in this course. Please note that announcements concerning any type of graded material may be in any format (e.g., announcements may be made only in class). Students are responsible for completing the graded material regardless of whether they received the announcement or not.