12392 version 4
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Demonstrate knowledge of principles of electricity generation prime
movers
Level
3
Credits
5
Purpose
People credited with this unit standard are able to demonstrate knowledge of:
the conversion of prime sources of energy into rotating kinetic mechanical
energy for conversion to electrical energy; the basic principles of operation of
prime movers; and the types and detailed principles of operation of two prime
movers in a electricity generation environment.
Subfield
Electricity Supply
Domain
Electricity Supply - Core Skills
Status
Registered
Status date
30 November 2000
Date version published
20 March 2008
Planned review date
31 December 2010
Entry information
Prerequisite: Unit 12390, Demonstrate knowledge of
electricity supply systems; 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 off job assessment.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop.
© New Zealand Qualifications Authority 2008
12392 version 4
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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
This unit standard includes water turbines, boilers, steam turbines (thermal and
geothermal), gas turbines, binary fluid turbines, internal combustion engines, and
wind turbines.
6
This unit standard excludes lightning, chemicals, batteries, photovoltaics, bimetals,
and fuel cells.
Elements and performance criteria
Element 1
Demonstrate knowledge of the conversion of prime sources of energy into rotating kinetic
mechanical energy for conversion to electrical energy.
Range
potential energy, kinetic energy, heat energy.
Performance criteria
1.1
Principles of energy and power are explained in terms of industry requirements.
Range
1.2
Conversion of potential energy to kinetic energy is explained in terms of industry
requirements.
Range
1.3
includes conversion losses.
Conversion into kinetic energy of potential and heat energy contained in steam
at various pressures and temperatures is explained in terms of industry
requirements.
Range
1.4
energy, rate of producing or consuming energy.
basic vapour cycles, steam turbine.
Principles of turbines are explained in terms of industry requirements.
Range
impulse turbines, reaction turbines.
© New Zealand Qualifications Authority 2008
12392 version 4
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1.5
Principles of reciprocating internal combustion engines are explained in terms of
industry requirements.
Range
two stroke engines, four stroke engines, pistons and cylinders,
compression of fuel-air mix, expansion of burning gas, inlet and
exhaust valves, cam shafts, fuel ignition, burning rate, pre-ignition,
reciprocating to rotary motion.
Element 2
Demonstrate knowledge of the basic principles of operation of prime movers.
Range
any three of – water turbines, fossil fuelled boiler and steam turbine, geothermal
field and steam turbine, binary fluid turbine, gas turbine, combined cycle plant,
wind turbine, internal combustion engine.
Performance criteria
2.1
The basic principles of operation of each prime mover are outlined in terms of
industry requirements.
Range
may include but not limited to – water turbine – headgate,
penstock, main valve, wicket gates or spear valve, reaction or
impulse blading, runner, draught tube;
prime energy source – storage, flows, rules and regulations;
fossil fuelled boiler and steam turbine – water tube boiler, main
steam valve, high, intermediate and low pressure turbines,
impulse and reaction blading, condenser, condenser cooling;
geothermal field and turbine – geothermal water and steam mix,
water separation, steam pipe lines, inlet valve, intermediate and
low pressure turbines, reaction blading, condenser, condenser
cooling;
binary fluid turbine – geothermal fluid heat source, evaporation of
secondary fluid, turbine, compressor, condenser, condenser
cooling;
gas turbine – air compressor, fuel combustion chambers, exhaust
turbine, exhaust gas disposal, generator turbine;
combined cycle plant – gas turbine, exhaust gas heat exchanger,
steam turbine;
wind turbine – wind kinetic energy, horizontal and vertical axis
types, blades, reaction blading, gearbox, generator, nacelle
yawing (for horizontal axis);
internal combustion engine – pistons and cylinders, two and four
stroke cycles, gas, petrol and diesel fuels, ignition, lubrication,
cooling, reciprocating to rotary motion.
© New Zealand Qualifications Authority 2008
12392 version 4
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Element 3
Demonstrate knowledge of the types and detailed principles of operation of prime movers.
Range
any three of – water turbines, fossil fuelled boiler and steam turbine, geothermal
and steam turbine, binary fluid turbine, gas turbine, combined cycle plant, wind
turbine, internal combustion engine.
Performance criteria
3.1
The types and detailed principles of operation of one of the following prime
movers are outlined in terms of industry requirements.
Range
may include but is not limited to – water turbine – headgates,
penstocks, change from potential to kinetic energy, Pelton,
Francis, Kaplan, propellor, bulb, turbines, scroll case, inlet valves,
bypass valves, spear valves, wicket gates, swing ring, governor,
speed control, relief valves, draught tube, turbine efficiency,
cavitation;
fossil fuelled boiler and steam turbine – water tube, fire tube,
economisers, superheaters, reheaters, boiler feed pumps,
enthalpy, impulse and reaction blading, high pressure,
intermediate pressure and low pressure turbines, casings, inlet
valves, governors, safety valves, blow-off valves, condensers,
cooling water pumps, cooling towers, turbine efficiency;
geothermal field and steam turbine – bores, geothermal watersteam fluid, centrifuges, drains, thermally insulated steam pipes,
expansion joints, main valve, intermediate and low pressure
turbines, inlet valves, governor, safety valves, condenser, cooling
water pumps, cooling towers, heat exchangers, reinjection of
condensate, turbine efficiency;
binary fluid turbine – geothermal fluid, heat exchanger, secondary
fluid, fluid evaporation, reaction turbine, cooler, compressor,
cooler, fluid condensation, geothermal fluid reinjection;
gas turbine – compressors, injectors, combustion chambers,
exhaust turbine, exhaust ducts, silencers, cooling, generator
turbine, turbine efficiency;
combined cycle plant – gas turbine, exhaust gas heat exchanger,
steam turbine;
wind turbine – horizontal axis, vertical axis, diffuser augmented,
blades, gearbox, brake, slip coupling, induction generator,
synchronous generator, blade number, efficiency of wind energy
extraction, stall, active stall and pitch control of power, apparent
wind, blade lift and drag, wind shear, blade torque and power,
feathering and stalling, fixed, variable and partial variable speed,
speed control, wind gusting, power spike control, kinetic energy
storage, fixed and teetering hub, rated wind speed, wind speed
operating window, wind shear, anemometer, survival wind speed,
wind vane, yawing, towers, foundations;
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internal combustion engine – four stroke, two stroke, pistons and
cylinders, inlet and exhaust valves, cam shaft, petrol, diesel, and
gas fuelled, burning rate, ignition timing, pre-ignition, fuel pumps,
carburettor, distributor, magneto, spark ignition, injector,
compression ignition, exhaust arrangements, cooling equipment,
lubrication, gearbox, governor, engine efficiency.
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 2008