Course Title: Solve problems in single and three phase low voltage circuits

Part B: Course Detail

Teaching Period: Term1 2009

Course Code: EEET6785C

Course Title: Solve problems in single and three phase low voltage circuits

School: 130T Vocational Engineering

Campus: City Campus

Program: C6085 - Advanced Diploma of Electrical - Technology

Course Contact: Rand Gorgis

Course Contact Phone: +61 3 9925 4378

Course Contact Email:

Name and Contact Details of All Other Relevant Staff

Nominal Hours: 80

Regardless of the mode of delivery, represent a guide to the relative teaching time and student effort required to successfully achieve a particular competency/module. This may include not only scheduled classes or workplace visits but also the amount of effort required to undertake, evaluate and complete all assessment requirements, including any non-classroom activities.

Pre-requisites and Co-requisites


Course Description

This unit covers AC theory, testing of correct operation of single and three phase circuits, solving circuit problems as they apply to servicing, fault finding, installation and compliance work functions. It encompasses safe working practices, multiphase circuit arrangements, issues related to protection, power factor and Multiple Earthed Neutral systems and solutions to circuit problems derived from calculated and measured parameters.

National Codes, Titles, Elements and Performance Criteria

National Element Code & Title:

UEENEEG002B Solve problems in single and three phase low voltage circuits


1. Prepare to solve single and three phase low voltage circuit problems.
2. Solve single and three phase low voltage circuit problems.
3. Complete work and document problem solving activities

Performance Criteria:


 1.1 OHS procedures for a given work area are identified, obtained and understood.
1.2 Established OHS risk control measures and procedures in preparation for the work are followed.
1.3 Safety hazards, which have not previously been identified, are noted and established risk control measures are implemented.
1.4 The nature of the circuit(s) problem is obtained from documentation or from work supervisor to establish the scope of work to be undertaken.
1.5 Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.
1.6 Sources of materials that may be required for the work are established in accordance with established procedures.
1.7 Tools, equipment and testing devices needed to carry out the work are obtained and checked for correct operation and safety.

2 2.1 OHS risk control measures and procedures for carrying out the work are followed.
2.2 The need to test or measure live is determined in strict accordance with OHS requirements and when necessary conducted within established safety procedures.
2.3 Circuits/machines/plant are checked as being isolated where necessary in strict accordance OHS requirements and procedures.
2.4 Established methods are used to solve circuit problems from measure and calculated values as they apply to single and three-phase low voltage  circuit.
2.5 Established methods for dealing with unexpected situations are discussed with appropriate person or persons and documented.
2.6 Unexpected situations are dealt with safely and with the approval of an authorised person.
2.7 Problems are solved without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.

3 3.1 OHS work completion risk control measures and procedures are followed.
3.2 Work site is cleaned and made safe in accordance with established procedures.
3.3 Justification for solutions used to solve circuit problems is documented.
3.4 Work completion is documented and an appropriate person or persons notified in accordance with established procedures.

Learning Outcomes

Details of Learning Activities

Classroom tutorials on AC theory and application of following concepts:
a) Sinusoidal alternating voltage and current
b) Phasors
c) Resistance Inductance and Capacitance in a.c. circuits
d) Impedance
e) Resonance
f) Power and power factor correction
g) Three-phase star and delta systems
h) Harmonics

Practical exercises on:
- Measurement of the instantaneous, peak, peak-to-peak values and the period of a sinusoidal waveform.
- Measurement of voltage, current, resistances and power dissipation
- the relationship between voltage drops and current in a resistive a.c. circuit.
- Series resonance and parallel resonance conditions.
- Connection in three-phase star and delta system.

Work simulated exercises in ascertaining correct operation of single and three phase circuits and solving circuit problems as they apply to servicing, fault finding installation and compliance of work functions.

Software applications for circuit simulation exercises using Multisim and PSPICE softwares.

Teaching Schedule

Week Number and Topic Delivered                                                Assessment Task
1   AC Generation
2   Waveforms
3   RMS, Peak Values, Form Factor,                                             Laboratory exercise 1
4   Phasors                                                                                       Laboratory exercise 2
5   Power
6   Capacitive Impedance                                                              Laboratory exercise 3
7   Inductive impedance                                                                 Laboratory exercise  4
8   Complex impedance                                                                Laboratory exercise 5
9   RLC circuits, Resonance                                                        Laboratory exercise 6
10 Progressive test                                                                        Progressive test 1
11 Power triangle
12 Power Factor correction
13 Three phase system                                                                Laboratory exercise 7
14 Star Delta conversions
15 Multiple Earthing neutral system
16 Energy , Harmonics
17 Assessment Progressive                                                               Test 2
18 Assessment feedback and catchup test

Learning Resources

Prescribed Texts

Boylestad “ Introductory Circuit Analysis


RMIT online learning resources are located on RMIT Online Learning Hub. Follow the link to log in
The Learning Hub ( Blackboard) is the central point of access to the online courses in which students are registered.

Other Resources


WEB Resources:
AC, DC circuits and Capacitance Animations
Meter theory and measurement

Overview of Assessment

This course will be assessed through a range of practical exercises, assignments and progressive tests.

Assessment Tasks

Tests 70%:
Written assessment to demonstrate an understanding on single and three phase theory involving: AC Ssnusoidal alternating waveforms, phasors, complex numbers, Series and parallel AC circuits, polypahse systems, three phase generators, MEN systems, active, reactive, and apparent power, power factor correction, circuit protection and determination of conditions causing an existing circuit to be unsafe.

Practical exercises 30%
- Alteration of an existing circuit to comply with specified operating parameters.
- Development of AC circuits to comply with a specified function and operating parameters.
- Determination of causes of low power factor in an existing circuit.

When performing the practical exercises, students must demonstrate ability to:
o Organise and manage the tasks within the exercise requirements
o Cope with any contingencies that arise during the simulations and solve inherent problems
o Perform tasks autonomously and/or as a member of a team as task proscribes
o Perform task and manage work environment/equipment according to safe working practice and OH&S requirements.

Assessment Matrix

                                                                                                                                                   Assessment Types

Competency National Code Competency Title Practical Exercises Assignment ProjectTests Industrial
UEENEEE002BSolve problems in single and three phase  low voltage circuits                                                                                                 X X  

Other Information

A license to practice in the workplace is required for work involving direct access to plant and equipment connected to installation wiring at voltages above 50 V a.c. or 120 V d.c.

This unit covers follwing Essential Knowledge & Associated Skills elements Alternating current principles - power
2.18.1 Occupational health and safety principles
2.18.2 Electrical safe working practice

Course Overview: Access Course Overview