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:
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lectures 3
tutorial 1
laboratory preparation 1
laboratory 1.5
assignments 2
study 3
Total hours per week: 11.5
CEAB WEIGHTING:
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ES = 60 %, D = 40 %
TEXTBOOK:
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Electric Machinery Fundamentals by Stephen J. Chapman, Chapters 1 - 2 and 7 11, 2nd Edition, McGraw-Hill.
DETAILED CONTENT
Introduction (5 hours)
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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)
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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)
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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)
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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)
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Professional practice
Transformer, motor and supply standards,
Matching applications to characteristics
Protection - circuit breakers, switches
Simple system calculations
DC Motors (6 hours)
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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.
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Lab 1. The Transformer
Goals: measurement of operating characteristics and prediction of performance
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Lab 2. Universal and Repulsion Motors
Goals: measurement of operating characteristics
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Lab 3. Single Phase Induction Motors
Goals: measurement of operating characteristics
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Lab 4. 3-phase Synchronous Motor
Goals: measurement of operating characteristics
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Lab 5. 3-phase Synchronous Generator
Goals: measurement of operating characteristics
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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.