12388 version 5
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Operate hydro-electric station auxiliary plant
Level
4
Credits
8
Purpose
People credited with this unit standard are able to: demonstrate knowledge of
the principles of electricity generation and the functions of generation
auxiliary plant and equipment; identify and communicate auxiliary plant and
equipment parameters; operate electricity generation auxiliary plant and
equipment; respond to events; and document generation auxiliary plant and
equipment operation.
Subfield
Electricity Supply
Domain
Electricity Supply - Power System Management
Status
Registered
Status date
16 April 2010
Date version published
16 April 2010
Planned review date
31 December 2014
Entry information
Prerequisites: Unit 12390, Demonstrate knowledge of
electricity supply systems; and Unit 12385, Operate
hydro-electric generating plant on site; 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, workplace assessment. The
range statements across the unit standard can be applied according to industry
specific equipment, procedures, and processes.
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12388 version 5
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2
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) 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,
Waikato Mail Centre, Hamilton 3240.
3
The phrase in accordance with industry requirements is implicit in all elements and
performance criteria in this unit standard.
4
Reference to procedures and specifications in this unit standard may be taken as
including documented procedures and specifications relevant to the workplace in
which assessment is carried out.
5
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, business, and quality management requirements
relevant to the workplace in which assessment is carried out.
6
Asset owner refers to the owner of an electricity supply network that takes its point of
supply from Transpower NZ and delivers electricity to industrial, commercial, and
residential customers.
7
The term operate is defined as manual operation and testing of hydro electricity
generation plant including plant adjustments, isolations and restorations.
8
SCADA is the Supervisory Control and Data Acquisition system, a computer system
that is used to operate equipment and monitor the performance of the electrical
power system and/or network, gather data for analytical purposes, and generally
assist the operation and delivery of electrical network functions concerning the supply
of electricity to customers.
9
Terms and abbreviations related to this unit standard:
Data refers to the information of a written or numerical form. The latter may include
summary statistics, information in tables, and numbers displayed in a variety of
graphs.
Switching refers to actions carried out by a network control centre to divert electrical
current, and permit contractors to perform work safely and efficiently on an electricity
supply network without discontinuing supply to customers.
DC - Direct current
AC - Alternating current
PC - Personal Computer
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Elements and performance criteria
Element 1
Demonstrate knowledge of the principles of electricity generation and the functions of
generation auxiliary plant and equipment.
Range
includes but is not limited to – prime movers, governors, generators, head
gates, stop logs, exciters, transformers, control and protection, batteries,
chargers, communications and SCADA, governor oil pumps, auxiliary
generators, standby generators, air compressors, transformer and bearing
cooling water systems, domestic water, sewerage, air conditioning and heating,
valves, dewatering and sump pumps, seal water filters, bearing oil coolers, oil
and water separators, oil interception, fire detection and protection equipment.
Performance criteria
1.1
The principles of electrical power systems and generating plant are described.
Range
1.2
Generation auxiliary plant and equipment and their functions are described.
Range
1.3
includes but is not limited to – AC systems, DC systems, voltage,
frequency, power balances, DC and AC generators, excitation
systems.
auxiliary plant control, indication, alarms and protection.
The principles of efficient resource use are defined and explained.
Range
plant and equipment efficiency curves, continuous and periodic
operation, resource consent limitations and obligations,
contamination avoidance, choice of AC auxiliary supply source,
black start capability.
Element 2
Identify and communicate auxiliary plant and equipment parameters.
Range
log contents, auxiliary plant and equipment, status, in-service, out of service,
isolated, voltage, frequency, currents, pressures flows, content levels.
Performance criteria
2.1
Plant and equipment status is determined.
Range
2.2
indications, alarms, protective relay flaggings, inspections,
transducers, SCADA.
Planned events which impact on equipment status are identified and their
impact determined and recorded.
Range
planned outages, work requests and work control systems.
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2.3
Information is transferred to relevant personnel in a manner and timeframe
which meets established operating requirements.
Element 3
Operate electricity generation auxiliary plant and equipment.
Range
stop, start, standby, isolating, earthing, control, indication and alarm settings,
active and reactive power, pressure, flow, level, temperature.
Performance criteria
3.1
Demonstrate knowledge of plant and equipment.
Range
3.2
Operating decisions are determined in accordance with plant status, local
knowledge, and operating requirements.
Range
3.3
includes but is not limited to – plant availability and service
condition, effect of loss of auxiliary, resource consent and loading
limits, impact, options, alternatives.
Plant and equipment are operated in sequence and in accordance with
schedules and workplace procedures within defined plant capabilities.
Range
3.4
single line diagram or PC display, power station layout, plant and
equipment type and characteristics, manufacturers’ operating
manuals and specifications.
main plant operating sequence and requirements, ratings,
reliability and security of DC and AC auxiliary supplies.
Plant and equipment is monitored within established operating requirements.
Range
includes but is not limited to – status, indications, alarms, defects,
action confirmation.
Element 4
Respond to events.
Range
emergency, unscheduled event, abnormal condition, alarms, protection
operations, power system faults, forced outage.
Performance criteria
4.1
System is stabilised.
Range
alarms reset, protection reset, shutdown of dependent plant
initiated, make affected plant and equipment safe.
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4.2
The event and/or cause of the event are identified using available resources.
Range
4.3
The event is acknowledged.
Range
4.4
local control, contingency plans, emergency operating procedures.
The event is analysed to identify options to remedy or mitigate undesired
conditions and hazards and identify future actions using established analysis
tools and procedures.
Range
4.6
acknowledgement, logging.
The impact of the event on generation is determined and responded to in
accordance with established procedures, policies, priorities and instructions.
Range
4.5
automatic data acquisition, alarms identified, protection identified,
events lists, event recording charts, alarm lists, SCADA.
event reporting procedures, maintenance management systems,
log book, event lists, relay flag sheets, plant history records.
The event reporting is conducted in accordance with established procedures
and instructions.
Range
local instructions, event reporting standards, Health and Safety in
Employment Act 1992, Electricity Act 1992, Electrical Regulations
1997.
Element 5
Document generation auxiliary plant and equipment operation.
Range
service report, log book, test reports and results, plant history, work control
documentation systems, operational plans, event lists, generation availability
data systems, generation management systems, maintenance management
systems, electronic log, operating orders and/or switching sheets, plant outage
requests, data, check sheets, statistical log sheets.
Performance criteria
5.1
Developed plans and recorded information are complete, concise, and legible.
5.2
Information is recorded in the required format and filed within scheduled
timeframe.
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.
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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 2016