Course Details

1. Examine and analyse magnetic circuits and air-gap effects
2. Examine and analyse the elements and operation of Power Transformers
3. Examine and analyse the elements and operation of D.C. motor and generator machines
4. Examine and analyse the elements and operation of A.C. motor and generator machines
5. Investigate in laboratory environment the characteristics of AC/DC machines and star/delta loads

Magnetic circuits: magnetic fields, magneto-motive force, magnetic flux density, magnetic flux, magnetic field strength, permeability, reluctance, magnetic circuit by analysis techniques, variation of B with H

Transformer steady-state description, theory and analysis:  application of transformers, operation principle, equivalent model, analysis under load/no-load, voltage regulation, inductance, ideal transformer, transformer losses, EMF equation of a transformer, leakage flux, efficiency, open / short circuit tests, current transformers, auto transformers

Asynchronous Machines - Induction Motors: terminology, applications of IM, elements, of IM, rotor construction types, operation principles, synchronous speed, rotor speed, concept of slip, effect of number of poles, equivalent circuit, powers in IM, torque, starting of IM

Synchronous Machines - Generators: terminology, applications and elements of SM, rotor construction types, operation principles, synchronous speed, rotor speed, effect of number of poles, equivalent circuit, powers in SM, torque, voltage regulation, synchronous impedance, power angle

DC Machines – DC Motor: terminology, advantages/disadvantages, DC machines as generators and motors, applications and elements of DC machines, compound/series/shunt would rotor construction, operation principles, speed of motor, torque of motor, speed and torque characteristics, speed control, equivalent circuit.

• Electrical Technology, 10/E, Edward Hughes, Prentice Hall, 2008
• Hambley AR, Electrical Engineering: Principles & Applications, 5E, Prentice-Hall, 2010

• Lucas-Nülle electrical machines training system laboratory manual
• Electrical Engineering: Principles & Applications, 5/E, Pearson, 2011
• Electric Machinery Fundamentals, Stephen Chapman, McGraw Hill, 4/E, 2005
• Electrical Machines, Drives and Power Systems, Theodore Wildi, Pearson, 6/E, 2006
• Electric Machinery, E. Fitzgerald,Charles Kingsley, Jr.,Stephen Umans, McGraw Hill, 6/E, 2002

Students are taught the course through lectures (3 hours per week) in classrooms or lectures theatres, by means of traditional tools or using computer demonstration. Students also have 1 laboratory session (1 hour per week) where they have the opportunity to put into practise concepts and theory related to power engineering.

Lectures are supplemented with laboratory work carried out on a machines training system, on three-phase loads and on a photovoltaic training system. During laboratory sessions, students examine and analyse the behaviour or DC motors and generators, of 3-phase loads connected in star/delta, the efficiency of a photovoltaic module and grid-connected / off grid photovoltaic systems.

Auditory exercises, where examples regarding matter represented at the lectures, are solved and further, questions related to particular open-ended topic issues are compiled by the students and answered, during the lecture or assigned as homework.

Topic notes are compiled by students, during the lecture which serve to cover the main issues under consideration and can also be downloaded from the lecturer’s webpage. Students are also advised to use the subject’s textbook or reference books for further reading and practice in solving related exercises. Tutorial problems are also submitted as homework and these are solved during lectures or privately during lecturer’s office hours. Further literature search is encouraged by assigning students to identify a specific problem related to some issue, gather relevant scientific information about how others have addressed the problem and report this information in written or orally.

Students are assessed continuously and their knowledge is checked through tests with their assessment weight, date and time being set at the beginning of the semester via the course outline.

Students are prepared for final exam, by revision on the matter taught, problem solving and concept testing and are also trained to be able to deal with time constraints and revision timetable.

The final assessment of the students is formative and summative and is assured to comply with the subject’s expected learning outcomes and the quality of the course.