NZQA registered unit standard
28572 version 1
Page 1 of 5
Title
Demonstrate knowledge of electricity generation in New Zealand
Level
3
Credits
6
Purpose
People credited with this unit standard are able to demonstrate
knowledge of: the principles of electricity generation; the types
of electricity generation in New Zealand; and switchyards,
substations and associated equipment.
Classification
Electricity Supply > Electricity Supply - Core Skills
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for off-job assessment. The range statements across
the unit standard can be applied according to industry specific equipment,
procedures, and processes as applied in the electricity supply industry.
2
Performance and work practices in relation to the outcomes and evidence
requirements must comply with all current legislation, especially the Electricity Act
1992 and any subsequent amendments, and any regulations, codes of practice
recognised under that statute, Health and Safety in Employment Act 1992, the
Resource Management Act 1991, and their subsequent amendments, electricity
supply industry codes of practice and documented enterprise procedures. These
include updated versions of Safety Manual – Electricity Industry (SM-EI) Wellington:
Electricity Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 2759
Wellington 6140.
3
The following terms and abbreviations relate to this unit standard:
AC refers to alternating current.
SCADA – Supervisory Control and Data Acquisition system, a computer system that
is used to operate equipment and monitor the performance of the electrical power
system and/or network, gather data for analytical purposes, and generally assist the
operation and delivery of electrical network functions concerning the supply of
electricity to customers.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28572 version 1
Page 2 of 5
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the principles of electricity generation.
Evidence requirements
1.1
The effect on conductor forced through magnetic field is explained in terms of
current induced in conductor.
1.2
The concept of electromagnetic fields is explained in terms of magnetic field
effect of conductor coil.
1.3
Concepts of AC generation are explained.
Range
rotating magnetic field, induced voltage in stator winding.
1.4
The effect on the generated output voltage of varying the current in the
electromagnetic rotating field coils and the rotational speed of a generator is
explained.
1.5
The effects of balance and imbalance between generator power output and load
power consumption are explained.
Range
1.6
The concept of an infinite bus in an electricity generation system is explained.
Range
1.7
frequency, output voltage.
system frequency, voltage and inertia.
The effects of varying the magnetic field strength of the rotor on generator
output under load when connected to an infinite bus are explained.
Range
reactive power, active power.
1.8
The concepts of single phase and three phase generation are explained.
1.9
The relationship of line voltage to phase voltage to earth is defined.
Range
1.10
Common transmission line voltages as used in New Zealand are defined.
Range
1.11
delta, star, 3 factor.
220 kV, 110 kV, 66 kV, 50 kV.
Common sub-transmission, distribution and reticulation line voltages used in
New Zealand are defined.
Range
Infrastructure ITO
SSB Code 101813
66 kV, 50 kV, 33 kV, 22 kV, 11 kV, 400 V, 230 V.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.12
28572 version 1
Page 3 of 5
The basic principles of high voltage direct current transmission are outlined.
Range
may include but is not limited to – bipolar, monopole and earth
return, converter stations, rectifiers, inverters, filters, advantages
and disadvantages over AC transmission.
Outcome 2
Demonstrate knowledge of the types of electricity generation in New Zealand.
Evidence requirements
2.1
The concept of electricity generation is explained in terms of fuel source and
characteristics, generation system, plant and equipment.
Range
2.2
may include but is not limited to – hydro, thermal, geothermal,
combined cycle, co-generation, bio gas, wind.
The different forms of fuel sources for electricity generation are compared in
terms of cost per unit of electricity and environmental issues.
Outcome 3
Demonstrate knowledge of switchyards, substations and associated equipment.
Range
may include but is not limited to – switchyards, transmission, sub-transmission
and distribution substations, transformers, switchgear, surge diverters,
protective equipment, voltage and current transformers, load control equipment,
communications, line traps, SCADA equipment.
Evidence requirements
3.1
The concepts of system reliability and security are explained.
Range
3.2
The concepts of fault causes and fault current magnitudes are explained.
Range
3.3
ability to continue non-interrupted supply of electricity, ability to
restore supply after interruption, time for repair.
insulator or insulation failure, lightning, trees, line or cable
damage, impedance change, fault current determination.
The cause of system fault currents is explained.
Range
Infrastructure ITO
SSB Code 101813
phase to phase faults, phase to earth faults, and typical magnitude
of fault currents in transmission and distribution networks.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3.4
28572 version 1
Page 4 of 5
Methods of fault current detection and principles of operation of protective
relays are described.
Range
current transformers, overcurrent relays, definite time and inverse
time relays.
3.5
The use, location and normal operating sequence of power transformers, circuit
breakers, disconnectors and earth switches are explained.
3.6
Common substation layouts are described.
may include but is not limited to – single and double busbar,
duplicate feeders, ring feeders, power and local transformer,
circuit breakers, disconnectors, earth switches, protection
equipment.
Range
3.7
Standard means of remote switching of controllable loads within distribution
systems are described.
Range
3.8
pilot wire, mains ripple frequency injection.
Standard means of remote control of switching stations and substations are
described.
Range
SCADA, telecommunications.
Replacement information
This unit standard replaced unit standard 19325.
Planned review date
31 December 2020
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
21 May 2015
N/A
Consent and Moderation Requirements (CMR) reference
0120
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28572 version 1
Page 5 of 5
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Infrastructure ITO (Connexis) qualifications@infrastructure.org.nz if you
wish to suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016