Download 12385 Operate hydro-electric generating plant on site

NZQA registered unit standard
12385 version 6
Page 1 of 6
Title
Operate hydro-electric generating plant on site
Level
4
Credits
8
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of the principles of hydro-electric generating plant
operation and protection; identify and communicate generating
plant status and generation parameters; operate generating
plant on site; respond to events; and document the generating
plant operation.
Classification
Electricity Supply > Electricity Supply - Power System
Management
Available grade
Achieved
Explanatory 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.
3
Performance and work practices in relation to the outcomes and evidence
requirements 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 current version of 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.
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
5
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.
6
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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017
NZQA registered unit standard
12385 version 6
Page 2 of 6
7
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.
8
The following terms and abbreviations relate to this unit standard:
AC – Alternating current
Auxiliary equipment includes – main exciter, commutator, pilot exciter, voltage
regulator, cooling systems, lube oil systems, seal systems, brake systems.
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.
DC – Direct current bearing.
Generator includes – stator core and windings, rotor poles and windings, shaft
couplings, slip rings, bearings.
The term operate is defined as manual operation and testing of hydro electricity
generation plant including plant adjustments, isolations and restorations.
SCADA – 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.
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.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the principles of hydro-electric generating plant operation and
protection.
Evidence requirements
1.1
Theory of mechanical and electrical power and energy is described.
Range
1.2
civil and hydraulic structures, turbines, valves and gates, potential
and kinetic power and energy, moment of inertia, rotational
energy, electrical active power and energy.
The principles of electrical power systems and electricity generators are
described.
Range
AC systems, DC systems, water turbines, transmission and
distribution, frequency, voltage, generators, exciters, transformers,
control and protection.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017
NZQA registered unit standard
1.3
The principles of efficient resource use are defined and explained.
Range
1.4
turbine efficiency curves, available static and operating heads,
generator capability diagrams, resource consent obligations and
limitations, storage, inflows, generation flows, governors, bypass
and relief valves.
The responsibilities of hydro-electric generating plant operators are defined in
accordance with operating requirements.
Range
1.5
12385 version 6
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controlling output power to dispatch, efficient utilisation of
resource, observing resource consent limits, issuing and
cancellation of work control documents, batteries,
communications, auxiliary plant.
The principles of generator electrical protection are described.
Range
generator circuit breaker control, protective relays for overcurrent,
earth fault, generator stator differential, overall generator –
transformer differential, over and under voltage, over and under
frequency, rotor earth fault, field failure, pole slipping, reverse
power.
Outcome 2
Identify and communicate generating plant status and generation parameters.
Range
log contents, work control documents in force, voltage, active power (MW),
reactive power (MVAR), generating flows, headwater levels, tailwater levels.
Evidence requirements
2.1
Plant and auxiliary equipment status is determined.
Range
2.2
Planned events that impact on plant and equipment status are identified and
their impact determined and recorded.
Range
2.3
indications, alarms.
planned outages, work requests, work control systems, permits,
access approvals, work authorities.
Information is transferred to relevant personnel in a manner and timeframe
which meets established operating requirements.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017
NZQA registered unit standard
12385 version 6
Page 4 of 6
Outcome 3
Operate generating plant on site.
Evidence requirements
3.1
Plant and equipment are operated.
Range
3.2
Operating decisions are determined in accordance with plant status, local
knowledge, and operating requirements.
Range
3.3
starting, running up, speed governing, excitation and matching
voltage, behaviour of speed and voltage control before and after
synchronising.
Plant and equipment are operated within legislative requirements to gain
maximum efficiency of energy conversion and meet active and reactive dispatch
power outputs.
Range
3.5
includes but is not limited to – plant availability and service
condition, resource consent and loading limits, impact, options,
alternatives, local operation, emergency operating.
Plant and equipment are started in sequence and within defined plant
capabilities.
Range
3.4
includes but is not limited to – single line diagram, power station
layout, turbine, wicket gates or spear valve, swing ring governor
servo, governor, relief valve, stator core and windings, rotor core,
poles and windings, bearings, slip rings, main and pilot exciters,
commutators, associated auxiliary equipment.
resource consents, flow ramping rates, generation flows, cooling
water discharge rates, turbine efficiency curves, generator
capability diagrams, local standing instructions.
Plant and equipment are monitored within established operating requirements.
Range
includes but is not limited to – indications, alarms, power status,
defects, action confirmation, SCADA operation.
Outcome 4
Respond to events.
Range
emergency, unscheduled event, abnormal condition, alarms, protective relay
operation, power system faults, forced outage.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017
NZQA registered unit standard
12385 version 6
Page 5 of 6
Evidence requirements
4.1
System is stabilised.
Range
4.2
The event and/or cause of the event is identified using available resources.
Range
4.3
local control, contingency plans, emergency operating procedures.
The event is analysed to identify options to remedy or mitigate undesired
conditions 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.
Range
4.5
alarms and protective relay operation identified, events lists, event
recording charts, alarms and protective relay flaggings listed,
SCADA.
The event is acknowledged.
Range
4.4
indications, alarms and protective relay operation acknowledged
and reset, active and reactive power outputs stabilised.
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, Electricity Regulations
1997.
Outcome 5
Document the generating plant operation.
Range
service report, log book, test reports and results, plant history, work control
documentation, event lists, generator availability data system, maintenance
management system, electronic log, operating orders and/or switching sheets,
plant outage requests, data, check sheets, statistical log sheets.
Evidence requirements
5.1
Recorded information is complete, concise, and legible.
5.2
Information is recorded in the required format and filed within scheduled
timeframe.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017
NZQA registered unit standard
Planned review date
12385 version 6
Page 6 of 6
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
26 August 1997
N/A
Review
2
30 November 2000
N/A
Revision
3
11 February 2004
N/A
Rollover and
Revision
4
26 November 2007
Review
5
16 April 2010
N/A
Revision
6
15 September 2011
N/A
N/A
Consent and Moderation Requirements (CMR) reference
0120
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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 [email protected] if
you wish to suggest changes to the content of this unit standard.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2017