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Power Devices and Systems
Course Objective: 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.
Prerequisite: An introductory undergraduate knowledge of electrical
and magnetic circuits under dc and ac conditions, resistance, inductance,
and capacitance, steady state and transient conditions, energy storage and
power concepts.
Suplimentary References:
Electric Machinery Fundamentals by Stephen J. Chapman, Chapters 1 - 2 and
7 - 11, 2nd Edition, McGraw-Hill.
Electric Machines by Charles I. Hubert, Chapters 1 - 9., Merrill (Collier
Macmillan Canada).
Course Self Evaluation: Based on sucessful completion of problem
sets, sample tests and exams provided.
DETAILED COURSE OUTLINE - the content (nominal minimum lecture hours)
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
DC Motors (6 hours)
- shunt motor load characteristics
- armature reaction and compounding
- field and armature voltage control
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
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
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
(Total Course = 39 lecture hours minimum)
LABORATORY EXPERIMENTS - optional (recommended if available)
- Lab TTF The Transformer
Goal: measurement of operating characteristics and prediction of performance
- Lab EPG Electric Power Generation
Goal: measurement of operating characteristics
- Lab DCC DC Motor with SCR Control
Goal: measurement of dc motor performance and observation of operation of SCR drive
- Lab SIM Single-phase Induction Motors
Goal: measurement of operating characteristics
- Lab PIM Poly-phase Induction Motor
Goal: measurement of operating characteristics and prediction of performance
- Lab PSM Poly-phase Synchronous Motor
Goal: measurement of operating characteristics
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