NZQA registered unit standard
26748 version 1
Page 1 of 4
Title
Carry out operations on a DC system associated with a power station
electrical system
Level
4
Credits
6
Purpose
People credited with this unit standard are able to: describe the
purpose, layout and operation of a direct current (DC) system
associated with a power station electrical system; describe the
functions and operation of an uninterruptable power supply
(UPS) in a power station electrical system; and carry out
operations on a DC system associated with a power station
electrical system.
Classification
Electricity Supply > Electricity Supply - Power System
Management
Available grade
Achieved
Explanatory 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 industry
specific equipment, procedures, and processes.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop.
3
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; and
the Health and Safety in Employment Act 1992. 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 is available from the
Electricity Supply Industry Training Organisation, PO Box 1245, Hamilton 3240.
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
5
Industry requirements include all industry and workplace documented policies,
procedures, specifications, business and quality management requirements relevant
to the workplace in which assessment is carried out.
6
Practical exercises should be used for assessment wherever possible.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
7
26748 version 1
Page 2 of 4
The following terms and abbreviations relate to this unit standard:
Status refers to the operational condition or state of any or all of the components of
an electrical power system, relative to its expected or required performance level.
Outcomes and evidence requirements
Outcome 1
Describe the purpose, layout, and operation of a direct current (DC) system associated
with a power station electrical system.
Evidence requirements
1.1
Description identifies the purpose of a DC system.
Range
1.2
includes but is not limited to – equipment supplied voltages.
Description details the system layout and identifies key equipment.
Range
includes but is not limited to – incoming supplies, back up
supplies, AC/DC generator, battery banks, boost chargers, float
chargers, float/boost chargers, rectifiers, converters.
1.3
Description identifies the status of the system under normal operational
conditions.
1.4
Description identifies operational contingencies in response to deviations from
normal incoming supply conditions and equipment failure.
Range
1.5
includes but is not limited to – loss of AC supplies, float charger
failure, emergency generator start failure.
Description identifies the purpose and operation of the boost charging facility.
Range
includes but is not limited to – interlocks.
Outcome 2
Describe the functions and operation of an uninterruptable power supply (UPS) in a power
station electrical system.
Evidence requirements
2.1
Description identifies the operational function of a UPS and the equipment it
supplies.
Range
includes but is not limited to – output design, reliability,
redundancy, frequency parameters, voltage parameters.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.2
Description identifies the key components of a UPS and their configuration.
includes but is not limited to – power supplies, changeover
switches, inverter, rectifier, battery banks, converter, transformer.
Range
2.3
Description identifies the modes of UPS operation.
includes but is not limited to – normal supply, back up supply,
battery supply, manual bypass, auto/static bypass, maintenance
bypass, test modes.
Range
2.4
26748 version 1
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Description explains the methods of UPS isolation.
Outcome 3
Carry out operations on a DC/emergency system associated with a power station electrical
system.
Evidence requirements
3.1
Routine checks and monitoring are carried out on a DC/emergency system.
includes but is not limited to – status indications, alarms, earth
faults, emergency generator availability.
Range
3.2
Routine checks are carried out in the battery room.
3.3
DC/emergency system plant and equipment operations are carried out.
includes but is not limited to – routine emergency generator test
run, DC pumps test run, UPS power supply changeover
operations, UPS bypass operations, UPS startup/shutdown
operations.
Range
3.4
The isolation of a UPS for maintenance purposes is carried out or simulated.
includes but is not limited to – inverter only, entire UPS.
Range
Planned review date
31 December 2015
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
9 December 2010
N/A
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
26748 version 1
Page 4 of 4
Please note
Providers must be granted consent to assess against standards (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 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.
Consent 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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016