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Operate a gas turbine and associated systems for electricity generation
in a thermal power station
Level
4
Credits
16
Purpose
This unit standard is for people who work in a thermal power station. People
credited with this unit standard are able to: demonstrate knowledge of gas
turbines; operate a gas turbine and associated systems; and demonstrate
knowledge of deviations from normal conditions in operating a gas turbine
and associated systems.
Subfield
Electricity Supply
Domain
Electricity Supply - Thermal Operations and Control
Status
Registered
Status date
20 June 2006
Date version published
20 June 2006
Planned review date
31 December 2011
Entry information
Open.
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 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 and the candidate will be
assessed as not yet competent.
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3
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) (2004) 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.
4
‘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.
5
Practical exercises should be used for assessment wherever possible, with the
exception of element 2 which requires operational experience.
Elements and performance criteria
Element 1
Demonstrate knowledge of gas turbines.
Performance criteria
1.1
The physics associated with gas turbines is explained in terms of application to
gas turbine design and operation.
Range
1.2
Components of a gas turbine are explained in terms of design and operating
concepts.
Range
1.3
properties of gas, laws of motion, energy flow, energy loss,
thermodynamics, Brayton cycle.
may include but is not limited to –
compressor or compressors – materials, blading, staging, bleed air
supplies;
turbine or turbines – materials, blading, staging, blade cooling,
combustion chamber or chambers, ignitors, silo, annular, canannular, nozzles;
rotors – solid, hollow, concentric;
gearbox arrangements, generator, bearings, sumps.
Auxiliary systems and equipment for gas turbines are described in terms of
function.
Range
may include but is not limited to – lubrication systems, jacking oil
and turning gear systems, hydraulic starting motor, transfer
gearbox, ancillary gearbox cooling systems, fuel systems, starting
system, drainage, compressed air, water wash.
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1.4
Protection systems and equipment are described in terms of purpose and
operating concepts.
Range
1.5
may include but is not limited to – variable bypass valve system,
flame sensing devices, electrical protection, anti-icing, backup
power supplies, purge systems, run down tanks, magnetic chip
detectors, supervisory equipment.
Control equipment is described in terms of purpose and operating concepts.
Range may include but is not limited to – variable geometry unit, guide vanes,
efficiency enhancement systems, NOx (nitrous oxide) emission
control system, AVR (automatic voltage regulator), inlet air
condition.
1.6
Indication equipment is described in terms of type and physical location.
Range may include but is not limited to – load, pressure, temperature, speed,
vibration, flow, position detection, emission levels.
1.7
Fire protection and ventilation systems are described in terms of operation.
Element 2
Operate a gas turbine and associated systems.
Performance criteria
2.1
Gas turbine plant is identified and pre-start checks on unit and associated
systems are carried out in accordance with industry requirements.
2.2
Start-up and associated operating and monitoring is carried out in accordance
with industry requirements.
Range
2.3
On-load operating and associated monitoring is carried out in accordance with
industry requirements.
Range
2.4
individual equipment and system starts, machine run to speed,
ignition, synchronisation, loading.
may include but is not limited to – control mode selection, load
changing, volt and Volts Amp Reactive (VAR) output adjustment,
operation within parameters.
Shutdown of unit and associated systems is carried out in accordance with
industry requirements.
Range
may include but is not limited to – sequence operation, system run
down and cool down requirements.
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2.5
Routine operating procedures are carried out in accordance with industry
requirements.
Range
may include but is not limited to – fuel changeover, water wash,
condition monitoring, plant changeover/duty cycles, lubrication
routines, fuel system purging, isolations and permit requirements,
equipment testing, inspections.
2.6
Recording and documentation is carried out in accordance with industry
requirements.
2.7
Report operating actions in accordance with industry requirements.
Element 3
Demonstrate knowledge of deviations from normal conditions in operating a gas turbine
and associated systems.
Performance criteria
3.1
Deviations from normal operating parameters are identified and explained to
determine the impact on plant operations.
Range
3.2
may include but is not limited to – pressure and temperature
excursions, vibration, fuel usage, breach of resource consent
parameters, loss of indication, loss of emission control system,
loss of efficiency enhancement system.
Plant safety, fire, and emergency procedures are followed in accordance with
industry requirements.
Range
may include but is not limited to – surge, stall, post-shutdown fire,
loss of lube oil, catastrophic failure.
Please note
Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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.
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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@attto.org.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016