22876 version 1
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Operate and monitor a generator and associated systems in a thermal
power station
Level
4
Credits
8
Purpose
People credited with this standard are able to demonstrate knowledge of:
electrical power and energy; electromotive force (EMF) production; magnets
and magnetism; direct current (DC) generation; alternating current (AC)
generation; generator and associated controls in a thermal power station;
and to operate and monitor the generator 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 within 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.
 New Zealand Qualifications Authority 2016
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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
This unit standard excludes standby and emergency generators.
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
The term ‘generator’ refers to main system generators.
7
The term ‘operate’ is defined as manual operation and testing of thermal electricity
generation plant including plant adjustments, isolations, and restorations.
Elements and performance criteria
Element 1
Demonstrate knowledge of electrical power and energy.
Performance criteria
1.1
Electrical power is defined in terms of voltage, current, and resistance, and its
units and symbols are stated in accordance with industry requirements.
1.2
Electrical energy is defined in terms of power and time, and its units and
symbols are stated in accordance with industry requirements.
1.3
The relationship between mechanical energy and power and electrical energy
and power is defined in terms of watt-seconds to joules, conversion of kilowatthours to joules, and conversion of joules to kilowatt-hours.
1.4
Efficiency is described in terms of the relationship between input and output
powers of electrical machines.
Element 2
Demonstrate knowledge of EMF production.
Performance criteria
2.1
Method of producing EMF is described.
Range
resistance, voltage, current, magnitude.
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22876 version 1
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Element 3
Demonstrate knowledge of magnets and magnetism.
Performance criteria
3.1
Magnetic terms are explained in accordance with industry requirements.
Range
3.2
permanent magnet, magnetic field, lines of force, magnetic poles,
magnetic flux, flux density.
Determine the direction of the magnetic field surrounding a current carrying wire
using any popular rule.
Range
any popular rule may include but is not limited to – the right-hand
screw rule.
3.3
Describe the construction of an electromagnet indicating current direction and
magnet polarity.
3.4
Determine the direction of the force exerted on a current carrying conductor in a
magnetic field using Fleming's left-hand rule.
Element 4
Demonstrate knowledge of DC generation.
Performance criteria
4.1
Demonstrate the induction of an EMF in a conductor being moved in a magnetic
field using Fleming's right-hand rule.
4.2
Describe the operation of a simple DC generator.
Range
4.3
simple generator – permanent magnet, single loop of wire, twosegment commutator, carbon brush.
Describe and demonstrate the wave form produced through one revolution of a
DC generator.
Element 5
Demonstrate knowledge of AC generation.
Performance criteria
5.1
Plot one cycle of a sine wave from values.
Range
one of – plot sine versus angle at 30-degree intervals, construct
graphically using instantaneous values from a rotating quantity.
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5.2
Describe the operation of a simple single-loop, two-pole alternator with slip-rings
and brushes.
5.3
Describe alternator output for each quarter-cycle through one revolution.
5.4
AC terms are defined in accordance with industry requirements.
Range
5.5
cycle, period, frequency, peak, average, instantaneous, rootmean-square (RMS).
The reason for using the RMS value of an AC wave form is stated in terms of
the equivalence of RMS and steady DC values for resistive heating effect.
Element 6
Demonstrate knowledge of generator and associated controls in a thermal power station.
Performance criteria
6.1
Generator operation is described in accordance with industry requirements.
Range
includes but is not limited to – construction, principles of operation,
generator capabilities, cooling.
6.2
Generator excitation and electrical protection is explained in accordance with
industry requirements.
6.3
Associated controls are described in accordance with industry requirements.
Range
includes but is not limited to – control and indication, temperature
control.
Element 7
Operate and monitor the generator and associated systems.
Performance criteria
7.1
Operations are carried out in accordance with industry requirements.
Range
includes but is not limited to – isolations, restorations, earthing,
routine testing.
7.2
Operating and monitoring actions are logged in accordance with industry
requirements.
7.3
Operating decisions are determined in accordance with plant status and
industry requirements.
Range
includes but is not limited to – plant availability and service
condition, resource consent and loading limits, impact on
operations, market conditions.
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7.4
Generator and associated systems are monitored in accordance with industry
requirements.
7.5
Deviations from normal operating conditions are identified, logged, and acted
upon in accordance with industry requirements.
Range
may include but is not limited to – lube oil leak to stator, cooling
water leak to stator, excessive temperature, loss of cooling or
lubricating fluid, H2S (hydrogen sulphide) ingression.
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.
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