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.
Electricity Supply - Core Skills
30 November 2000
Date version published
20 March 2008
Planned review date
31 December 2010
Prerequisite: Unit 12390, Demonstrate knowledge of electricity supply systems; or demonstrate equivalent knowledge and skills.
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
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.
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 requirementsinclude 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 energy, rate of producing or consuming energy.
1.2 Conversion of potential energy to kinetic energy is explained in terms of industry requirements.
Range includes conversion losses.
1.3 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 basic vapour cycles, steam turbine.
1.4 Principles of turbines are explained in terms of industry requirements.
Range impulse turbines, reaction turbines.
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;
internal combustion engine – pistons and cylinders, two and four stroke cycles, gas, petrol and diesel fuels, ignition, lubrication, cooling, reciprocating to rotary motion.
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 water-steam 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;
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;
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 firstname.lastname@example.org if you wish to suggest changes to the content of this unit standard.