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

Part B: Course Detail

Teaching Period: Term2 2012

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 1.1 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 authorized 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 or PSPICE softwares.

Teaching Schedule

Week Number         Topic Delivered                                                                          Assessment Task
1                                    AC Generation
Elements 1.1, 2.1, 3.1

2                                      Waveforms
Elements 1.1, 1.2, 1.3, 2.1, 2.2  3.1, 3.2

3                                    RMS, Peak Values, Form Factor                                      Laboratory #1
Elements 1.1, 1.2, 1.3,  2.1, 2.3, 2.4, 3.1, 3.2, 3.4

4                                                      Phasors                                                              Laboratory # 2
Elements 1.1, 1.2, 1.3, 1.4, 2.1, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4

5                                                       Power
Elements 1.1, 1.4, 1.5, 1.6, 1.7, 2.1, 2.3, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

6                                                 Capacitive Impedance                                          Laboratory # 3
Elements 1.1, 1.3, 1.5, 1.6, 2.1, 2.5, 2.6, 2.7, 3.1, 3.2, 3.3, 3.4

7                                              Inductive impedance                                               Laboratory # 4
Elements 1.1, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

8                                               Complex impedance                                              Laboratory # 5
Elements 1.1, 1.2, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

9                                              RLC circuits, Resonance                                       Laboratory # 6
Elements 1.1, 1.3,1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 2.7, 3.1, 3.2, 3.3, 3.4

10                                                        Progressive test                                       Closed book test 1
Elements 1.1, 1.4, 1.5, 1.6, 1.7, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

11                                                            Power triangle
Elements 1.1, 1.4, 1.5, 1.6, 1.7, 2.1, 2.2, 2.5, 2.6,2.7,  3.1, 3.2, 3.3, 3.4

12                                                    Power Factor correction
Elements 1.1, 1.4, 1.5, 1.6, 1.7, 2.1, 2.3, 2.5, 2.6,2.7,  3.1, 3.2, 3.3, 3.4

13                                                        Three phase system                                      Laboratory # 7
Elements 1.1, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

14                                                            Star Delta conversions
Elements 1.1, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

15                                                             Multiple Earthing neutral system
Elements 1.1, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

16                                                                  Energy , Harmonics
Elements 1.1, 1.4, 1.5, 1.6, 2.1, 2.5, 2.6, 3.1, 3.2, 3.3, 3.4

17                                                                   Assessment                                       Closed book exam 
18                                                             Assessment feedback                                 Assignment due

Learning Resources

Prescribed Texts

Boylestad “ Introductory Circuit Analysis 12th Eddition



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%: 
One closed book test (25%) and a closed book exam (45%)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. 

Laboratories 15%
- 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.

 Assignment 15%
- Based on using multisim software to simulate practical tasks

Assessment Matrix


                    Assessment Type
Competency National CodeCompetency Title laboratories Assignment TestsIndustrial
UEENEEE002BSolve problems in single and three phase low voltage circuits Weeks:
3,4,6,7,8, 9,13
Due in week 18Closed book test
Week 10

Closed book Exam 

Exam week

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

In this course minimum student directed hours are 16 in addition to 64 scheduled teaching hourse.

Student directed hours may involve completing activities such as reading on line resourses, assignments, project work, individuale student-teacher course related consultation, organized industrial visits, writing reflective journals and lab reports.

This course is graded using the following course grades:
CHD- Competent with High Distinction
CDI- Competent with Distinction
CC- Competent with Credit
CAG- Competency Achieved - Graded
NYC- Not Yet Competent
DNS- Did Not Submit for Assessment.

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Late submission:

If you require an Extension of Submittable Work (assignments, reports or project work etc.) for 7 calendar days or less (from the original due date) and have valid reasons, you must complete and
lodge an Application for Extension of Submittable Work (7 Calendar Days or less) form and lodge it with the Senior Educator/ Program Manager.
The application must be lodged no later than one working day before the official due date. You will be notified within
no more than 2 working days of the date of lodgment as to whether the extension has been granted.

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Consideration form under the provisions of the Special Consideration Policy, preferably prior to, but no later than 2 working days
after the official due date.

Submittable Work (assignments, reports or project work etc.) submitted late without approval of an extension will not be accepted or marked.

Special consideration:

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