NZQA registered unit standard
27655 version 1
Page 1 of 3
Title
Demonstrate familiarity with common faults, relay systems, and
components of diagrams in power system protection systems
Level
3
Credits
4
Purpose
People credited with this unit standard are able to: describe the
different types of faults managed by power system protection
systems; describe common types of protection relays operated
by the faults; and demonstrate familiarity with the components
in simple power system protection diagrams.
Classification
Electricity Supply > Electricity Supply - Power System
Maintenance
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for on-job assessment. The range statements across
the unit standard can be applied according to industry-specific equipment,
procedures, and processes.
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 outcomes and evidence
requirements 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 current version of 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, Waikato Mail Centre, Hamilton 3240.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
27655 version 1
Page 2 of 3
Outcomes and evidence requirements
Outcome 1
Describe the different types of faults managed by power system protection systems.
Evidence requirements
1.1
Description includes the different causes of faults, and characteristics of faults
associated with each cause.
Range
1.2
Description includes the types of faults likely to occur in installations and
equipment found in each of the generation, transmission, and distribution
sectors.
Range
1.3
causes include: electrical or mechanical failure, overload,
lightning, wind, fire.
at least three faults from each of – generation, transmission,
distribution sectors.
Description includes definitions of common terms associated with protection
systems.
Range
common terms include but are not limited to – stability,
discrimination, speed of operation, sensitivity, back-up protection,
inverse-time characteristics, definite-time characteristics.
Outcome 2
Describe common types of protection relays operated by the faults.
Evidence requirements
2.1
Description includes the different types of common protection relays that may
be used to provide power system protection.
Range
2.2
Description includes the boundaries of protection.
Range
2.3
at least three different types of common protection relays.
includes but is not limited to – unit protection, non-unit protection.
Description includes the ANSI codes for the protection relays identified.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
27655 version 1
Page 3 of 3
Outcome 3
Demonstrate familiarity with the components in power system protection diagrams.
Evidence requirements
3.1
The protection system components in diagrams are identified.
Range
components are identified in at least one protection system
diagram from each of – generation, transmission, distribution.
Planned review date
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
19 April 2012
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.
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 Electricity Supply Industry Training Organisation info@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016