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209SE: Electrical Engineering



This section shows main aspects of the module 209SE : Electrical Engineering

Aims

The curriculum of this module covers topics associated with electrical engineering.

These topics will include single phase and three phase circuits, transformers, motors and generators.


Intended Learning Outcomes

The intended learning outcomes are that on completion of this module the student should be able to:

1. Analyse and predict the behaviour of  RLC circuits in response to transient and alternating voltage excitation

2. Analyse three phase circuits

3. Model magnetic and electric fields as found in common electrical devices e.g. the transformer

4. Specify motor characteristics and  design features

5.    Specify alternator characteristics and  design features

Content

AC Power
Relationships between power, reactive power and apparent power factor, principle of conservation of power and reactive
power, reactive power absorbed by capacitors and inductors, phasor representation, power factor correction. Analysis of
series and parallel resonant circuits. Transient conditions in RLC circuits, modelling transients.

Three Phase Circuits
Balanced and unbalanced 3 phase circuits, 3 phase phasor representations; power calculations, summation of phase currents;
effects of harmonic components, star to delta transformations.

Magnetic and Electric Theory (overview)
Electric flux, flux density, field strength, motive force, potential difference, field plotting, dielectric strength, example of insulator
dielectric, forces within electric fields, permittivity.  Magnetic, flux, flux density, field strength, potential difference, permeability,
magnetic circuits, magnetic materials, saturation affects, B/H curve, magnetic forces between current carrying conductors,
magneto-motive force.

Transformers
Principle of action, e.m.f equation, magnetic flux paths within the transformer, useful and leakage flux, equivalent circuit for
transformer, efficiency, regulation, transformer tests, types of transformer, K rating.

Motors and Generators
Energy conversion process and energy balance. Synchronous machine and alternator. Induction motors, torque speed
characteristic and slip. Cage and Slip ring motors Split phase and Shaded pole motors, efficiency, physical construction. Direct
current machines, motors and generators, general types of machine, e.m.f equations, speed torque chararacteristics, efficiency
etc. Physical construction of electrical machines e.g. stator and rotor design.

Teaching and Learning

Activity  Type
Hours
Comments
Practical Classes and workshop
-
Tutorial
-
Lecture
-
Guuided independent study
-
TOTAL
100
TTotal student effort for the module: 100 hours

Comprising 22 hours lectures and tutorials and a 2-hour practical exercise

Assessment

Assessment Type
Weigth
Exam Length
Coursework
30%
Exam
70%
1.5h
TOTAL
100

Assessment is through an assignment report (30%) and a 1.5 hour unseen examination (70%).

Readings

- Warnes, L. (1998); Electronic and Electrical Engineering-Principles and Practice, 2nd Edition, UK: Macmillan Press Ltd (ISBN 0333743113)
- Cogdell, J.R. (1999); Foundations of Electric Power, UK: Prentice-Hall (ISBN 0139077677)
- Hughes, E. (2008) Electrical and Electronic Technology, 10th Edition Harlow, UK: Pearson Prentice Hall (ISBN 0132060110)

Download

Lecture Plan

LECTURE 1: Introduction, AC Circuits

LECTURE 2: Phasor representation, real and reactive power

LECTURE 3: PF correction, Resonant circuits

LECTURE 4: Modelling and Simulation

LECTURE 5: 3-phase circuits - star, delta

LECTURE 6: 3-phase power calculation

LECTURE 7: Star-to-delta conversion

LECTURE 8: Modelling and Simulation II

LECTURE 9: Transients in RLC circuits

LECTURE 10: Magnetic field theory

LECTURE 11: B/H curve, Forces

LECTURE 12: DC Machines: Generator

LECTURE 13: DC Machines: Motor

LECTURE 14: Speed-torque characteristics

LECTURE 16: Transformer - principle

LECTURE 17: Equivalent Circuit & regulation

LECTURE 18: Transformer tests

LECTURE 19: Synchronous machine

LECTURE 20: Induction Motor

LECTURE 21: IM - Torque-speed curve