ENGINEERING TRIPOS PART IB - 2012/2013
PAPER 5 - ELECTRICAL ENGINEERING (2)
Leader: Dr R.A. McMahon, Dr. P. R. Palmer
Timing: Weeks 1,3,5 & 7 Lent term, 2 lectures/week; weeks 2,4,6
& 8 Lent term, 1 lecture/week
Structure: 10 lectures + 2 examples classes
The functioning of modern industrial society depends heavily upon the ready
availability of energy in a form that can be transported cheaply and converted
easily into other forms. The advantages of electricity make it the overwhelming
choice as the medium of transportation. The processes by which electricity is
generated and the means by which it is reconverted into mechanical energy for
industrial uses are therefore of fundamental importance.
The aims of this course are to:
- Introduce the student to
the principal types of electromechanical energy conversion device (induction motor, synchronous machine) as well as to the
transmission and distribution of a three-phase power system.
At the end of the course, students should be able
- Understand why three-phase
systems are used universally for bulk power transfer.
- To analyse balanced
- Understand the principles
of per-unit calculation.
- Perform basic calculations
on balanced three-phase loads, including symmetrical three-phase
- Understand the form and
construction of synchronous generators, induction machines.
- Understand the synchronous
generator phasor diagram and operating chart, and be able to carry out
performance calculations using either.
- Understand the effects of
torque control and excitation control on the behaviour of a synchronous
- Carry out performance
calculations on the induction motor, using the per-phase equivalent
- Understand the factors
controlling the shape of the induction motor torque/speed curve.
1. Three-phase systems(2L)
- Star and delta-connected
loads and sources.
- Star-delta transformation.
- Single phase
- Solution of balanced
three-phase circuits including mixed loads.
- Power factor correction.
2. Generation (2L)
- Prime energy sources.
- Constraints on power
- Basic principles of a.c.
- Comparative utility of
single-phase and three-phase .
- Production of a rotating magnetic field by a three-phase winding.
- Development of synchronous machine equivalent circuit.
3. Synchronous Generators (2L)
- Phasor diagrams.
- Operation as a motor.
- Operation as a generator.
- Power and reactive power
- Operating chart.
4. Transmission and Distribution (2L)
- Per-unit system.
- Symmetrical three-phase
5. Induction Motors (2L)
- Principles of operation
- Derivation of equivalent
- Performance predictions
using equivalent circuit.
characteristics and control of rotor resistance to vary them.
Please see the Booklist for Part IB Courses for references for this module.
Last updated: May 2012