12711 (v.3) Electrical Systems 204

Area:

Department of Electrical and Computer Engineering

Credits:

25.0

Contact Hours:

4.0

Lecture:

1 x 2 Hours Weekly

Tutorial:

1 x 1 Hours Weekly

Laboratory:

1 x 2 Hours Fortnightly

Prerequisite(s):

12706 (v.2) Electrical Circuits 104 or any previous version

Syllabus:

Review of three phase circuits and singly and doubly excited systems - Review of three phase circuits, review of magnetic circuit theory and flux linkages, Definition of Self and mutual Inductances, Torque production in a singly excited system, Torque production in a doubly excited system. Three-phase Induction Motors - rotating magnetic field theory, Exact equivalent circuit representation, Approximate equivalent circuit, Performance calculations, Torque-speed characteristics, starting torque, maximum torque, NEMA Classification of induction motors and energy efficient motors, equivalent circuit parameters from tests, starting methods and speed control (VVVF, vector control etc). Transformers - principles of operation and equivalent circuit, determination of parameters of approximate equivalent circuit, performance calculations, three phase transformer connections. DC Motors - series and shunt motor models, efficiency and torque-speed characteristics, DC motor speed control. Single phase induction motors - revolving field theory and equivalent circuit, performance calculations, split phase and capacitor start motors. Fractional horsepower motors - permanent magnet dc motor, reluctance motor and hysterisis motor, stepper motors.

Unit Outcomes:

On successful completion of this unit students will gain an overview of the three phase systems, an understanding of the complex power, power triangles, analytical skills in series and series-parallel magnetic circuits and energy conversion principles and an understanding of magnetic force and related magnetic quantities. They will acquire fundamental skills in torque production in electric motors, an understanding of single and three phase induction motor windings and equivalent circuits and will acquire an ability to calculate performance of an induction motor including speed control. They will also acquire knowledge on dc motor operation and control and the ability to calculate performances of single and three phase transformer performances and connections, as well as an understanding of how smaller fractional horsepower motors work and an appreciation of short transmission line models and basics of distribution system models.

Text and references listed above are for your information only and current as of September 30, 2003. Please check with the unit coordinator for up-to-date information.

Unit References:

Nasar, S., 1995, 'Electric Machines and Power Systems', Mc Graw Hill Inc., New York. El-Hawary, M., 'Principles of Electric Machines with Applications to Power Electronics', Prentice Hall Inc. Zia, A. and Bala, J., 1994, 'Electromechanical Energy Devicesand Power Systems', New York, John Wiley & Sons Inc.

Unit Texts:

Chapman, S., (Fitzgerald & Sadaat), 2001, 'Electric Machinery Fundamentals' , McGraw Hill, New York. Electrical Systems 204 Lecture Notes, Curtin University Bookshop.

Unit Assessment Breakdown:

Assignments 15%. Mid-term Examination 20%. Final Examination 50%. Laboratory 15%. To pass this unit students must obtain a total assessment mark of at least 50%. as well as a minimum of 50% in the final examination. This is by grade/mark assessment.

Year	Location	Period	Internal	Area External	Central External
2004	Bentley Campus	Semester 2	Y