26021 version 1
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Demonstrate knowledge of advanced concepts in power system
protection
Level
6
Credits
15
Purpose
People accredited with this unit standard are able to: demonstrate knowledge
of, design, and evaluate logic diagrams; demonstrate knowledge of
transformer protection; demonstrate knowledge of generator protection;
demonstrate knowledge of line protection; demonstrate knowledge of, and
produce reports on substation automation; demonstrate knowledge of, and
produce reports on typical motor protection schemes and settings; and
demonstrate knowledge of digital protection and control systems.
Subfield
Electricity Supply
Domain
Electricity Supply - Power System Maintenance
Status
Registered
Status date
20 November 2009
Date version published
20 November 2009
Planned review date
31 December 2013
Entry information
Prerequisite: Unit 26020, Demonstrate knowledge of
intermediate concepts in the electricity protection
system, or demonstrate equivalent knowledge and skills.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
This unit standard is intended for, but not restricted to, workplace assessment. The
range statements across the unit standard can be applied according to industryspecific equipment, procedures, and processes.
 New Zealand Qualifications Authority 2016
26021 version 1
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2
Protection systems may include those associated with prime movers, generators,
transformers, bus work and distribution networks including: fault detection systems,
shutdown and alarm initiation systems, electrical protective relays, voltage and
current transformers, field devices, transducers, programmable logic controllers,
computers, and alarm annunciation systems.
3
Sources of information include but are not limited to the International Electrotechnical
Commission (IEC), the Institution of Engineering and Technology (IET), the American
National Standards Institute (ANSI), and the Deutsches Institut für Normung e. V. (DIN).
4
Performance and work practices in relation to the elements and performance criteria
must comply with all current legislation, especially the Electricity Act 1992, and any
regulations and codes of practice recognised under that statute; the Health and
Safety in Employment Act 1992; and the Resource Management Act 1991.
Electricity supply industry codes of practice and documented industry procedures
include the Safety Manual – Electricity Industry (SM-EI) Wellington: Electricity
Engineers’ Association. A full list of current legislation and industry codes of practice
is available from the Electricity Supply Industry Training Organisation, PO Box 1245,
Hamilton 3240.
5
The phrase in accordance with industry requirements is implicit in all elements and
performance criteria in this unit standard.
6
‘Industry requirements’ include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, and business and quality management
requirements, relevant to the workplace in which assessment is carried out.
Elements and performance criteria
Element 1
Demonstrate knowledge of, design, and evaluate logic diagrams.
Range
automation systems, electronics, electronics circuits, sequential logic circuits,
automatic adjustment systems (SRA), automatic regulators, digital electronics
circuits, transducers, execution elements.
Performance criteria
1.1
The functions of the logical functions from the logic diagrams in power safety
protection systems are described.
1.2
Logic diagrams are interpreted.
1.3
Logic diagrams for protection schemes are designed and evaluated according to
IEC regulation 61850.
Range
generators, motors, transformers, distribution and transmission lines,
substations.
 New Zealand Qualifications Authority 2016
26021 version 1
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Element 2
Demonstrate knowledge of transformer protection.
Range
in rush currents, on load tap changers, over current and earth fault protection,
differential protection, restricted earth faults, gas relays (both pressure and
accumulation), winding temperature calculation, both electro-mechanical and
digital microprocessor relays, DC resistance, tan delta, losses acceptance
testing, Printed Circuit Board (PCB) testing, on-hand temperature change,
under impedance relays, natural earthing protection, impedance relays, polarity
(polarity testing of transformer).
Performance criteria
2.1
The purpose of the voltage transformer is described in terms of measuring
voltage.
2.2
The purpose of the current transformer is described in terms of measuring
current.
2.3
The factors involved in transformer protection are described.
2.4
Parameters for testing are identified.
Element 3
Demonstrate knowledge of generator protection.
Range
winding temperature, over speed, under voltage, over voltage, failure of support
ancillary equipment, cooling pumps, start-up procedure, voltage control, under
impedance, negative sequence.
Performance criteria
3.1
The over current and earth fault protection are identified.
3.2
Electro-mechanical and digital microprocessor relays in generation protection
are compared.
3.3
Differential protection in generation protection is described.
3.4
Reverse power relays operating criteria are described.
3.5
Acceptance testing standards are outlined.
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26021 version 1
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Element 4
Demonstrate knowledge of line protection.
Range
over current and earth protection, impediance protection, distance protection,
signals used in line protection, electro-mechanical and digital microprocessor
relays, auto recluse, line closures and switching, ripple injection, fuse burning
delay trip.
Performance criteria
4.1
The different types of protection present in line protection are identified.
4.2
The relay functions available are described.
4.3
Recommendations for line protection are justified.
4.4
Protection relay applications are compared.
Element 5
Demonstrate knowledge of, and produce reports on, substation automation.
Performance criteria
5.1
Commissioning and acceptance planning, and testing procedures, are outlined.
5.2
Metering in substation automation systems is described.
5.3
The role of transducers is explained.
5.4
Protection relay settings are compiled.
5.5
Post-commissioning and testing reports are produced.
Element 6
Demonstrate knowledge of, and produce reports on, typical motor protection schemes and
settings.
Performance criteria
6.1
Commissioning and acceptance planning and testing procedures are outlined.
6.2
Metering in typical motor protection is described.
6.3
The role of transducers is explained.
6.4
Protection relay settings are compiled.
6.5
Post-commissioning and testing reports are produced.
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26021 version 1
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Element 7
Demonstrate knowledge of digital protection and control systems.
Performance criteria
7.1
Digital protection controls are identified.
Range
7.2
Common testing methods in digital power system protection are described.
Range
7.3
cable fault finding, Automatic Voltage Regulator (AVR) control,
auto switching, load shedding, ripple control, load control,
substation protection system, permit to work, capacitors.
power factor testing, substation testing, pressure testing cables
and phasing.
Future distribution protection systems are described.
Range
the era of Innovative Electronic Design (IED), function and
protection of the power system network with IED, communications,
control, metering and monitoring.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP 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 Electricity Supply Industry Training Organisation info@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016