24669 version 1
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Carry out routine inspection and service of high voltage static var
compensation (SVC) equipment
Level
4
Credits
5
Purpose
People credited with this unit standard are able to: prepare for inspection,
testing, and servicing on high voltage static var compensation (SVC)
equipment; carry out routine inspections and diagnostic tests; carry out
servicing; complete documentation; and return equipment to service; in
accordance with industry requirements.
Subfield
Electricity Supply
Domain
Electricity Supply - Power System Maintenance
Status
Registered
Status date
23 April 2008
Date version published
23 April 2008
Planned review date
31 December 2012
Entry information
Prerequisites: Unit 12296, Apply earths to and remove
earths from electrical conductors, plant and equipment;
Unit 14287, Use and maintain test instruments used
within the high voltage electrical industry; Unit 14294,
Carry out insulating oil sampling and voltage breakdown
tests; Unit 14333, Carry out routine inspection and
servicing on transmission power transformers above
33kV; Unit 14334, Carry out routine service on
transmission instrument transformers 33kV and above;
Unit 14700, Apply and remove safety measures in an
electricity supply environment; and Unit 14701, Manage
electricity supply work control systems; or demonstrate
equivalent knowledge and skills.
Core electrical theory is essential knowledge
underpinning the performances required by this unit
standard.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
 New Zealand Qualifications Authority 2016
24669 version 1
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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 can be assessed against in a workplace environment, or in a
training or educational environment if simulated equipment response and examples
are able to be provided, or in a combination of both environments.
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) (2004) Wellington: Electricity
Engineers’ Association, and Transpower Service Specification (TP.SS 06.20). A full
list of current legislation and industry codes is available from the Electricity Supply
Industry Training Organisation, PO Box 1245, Hamilton.
3
Reference to terms, 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.
4
The range of this unit standard is limited to carrying out routine inspection and
servicing of high voltage SVC equipment installed at electricity supply substations.
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
The following terms and abbreviations relate to this unit standard:
CT
= Current Transformer.
DGA
= Dissolved Gas Analysis.
NZECP 34 = New Zealand Electrical Code of Practice for Electrical Safe Distances.
PCB
= Poly Chlorinated Biphenyl.
SCADA
= Supervisory Control and Data Acquisition.
VAR
= Volt-Amp Reactive.
 New Zealand Qualifications Authority 2016
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Elements and performance criteria
Element 1
Prepare for inspection, testing, and servicing on high voltage SVC equipment in
accordance with industry requirements.
Performance criteria
1.1
The scope of work and equipment to be serviced is identified from client
requirements.
Range
1.2
Appropriate equipment and tools are made ready.
Range
1.3
includes the correct and timely completion of all the prescribed
equipment release requests.
Maintenance documentation is prepared and the known defect and service
history is made available.
Range
1.6
includes the completion of the necessary documentation, where
required, to uplift client held spares.
The requests for release of operational equipment are placed.
Range
1.5
may include special tools identified in work procedures or
manufacturers’ manuals.
The anticipated replacement spare parts are ordered from the warehouse in
time for the work.
Range
1.4
may include but is not limited to – manufacturers’ manuals, client
information and maintenance standards, industry procedures for
inspecting and servicing high voltage SVC equipment.
may include but is not limited to – any information concerning any
known previous problems or defects, client or industry inspection
and servicing requirements, operator reports, client special service
requests, check for PCB free insulating liquid, oil analysis, DGA,
thermography tests.
Access to the equipment is provided.
Range
may include but is not limited to – access permit or its equivalent,
isolation points checked, earthing applied, individual capacitors
and reactors discharged prior to handling, inspection of working
zone to ensure the safe working area has been correctly
delineated and provides a safe working environment, NZECP 34.
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Element 2
Carry out routine inspection and diagnostic tests in accordance with industry requirements.
Performance criteria
2.1
The SVC equipment defect history and operational records are scrutinised, and
incidents indicating service needs noted for attention during routine servicing.
Range
2.2
The inspections are carried out to identify any damage or defects.
Range
2.3
may include but is not limited to – identify oil leaks, cooling system
leaks, failed capacitors, leaking capacitors, reactor defects,
thyristor valve defects, signs of over heating, insulating oil DGA
results, bird nests, blown fuses, cracked and/or damaged
insulators.
The diagnostic tests are carried out and results analysed to identify servicing
needs.
Range
2.4
may include but is not limited to – step-down transformer, control
and protection system, thyristor controlled reactors (TCRs),
current limiting reactors (CLRs), thyristor valves, cooling system,
filter banks and thyristor controlled capacitors (TCCs), fixed filter
circuit, mechanically switched shunt capacitors (MSCs).
may include but is not limited to – transformer diagnostic tests, CT
diagnostic tests, SVC equipment diagnostic tests, replacement of
failed or out of tolerance equipment, excess work components
replaced, replace or repair oil leaks, cleaning of porcelain
insulators, removal of bird nests, connection leads and bus clamps
tightened.
The results of the diagnostic tests are recorded.
Range
may include but is not limited to – completing selected client or
industry check lists, electronic data records, client reports.
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Element 3
Carry out servicing in accordance with industry requirements.
Performance criteria
3.1
The servicing needs identified by inspection and diagnostic tests are completed
on the step-down transformer.
Range
3.2
The servicing needs identified by inspection and diagnostic tests are completed
on the control and protection system.
Range
3.3
may include but is not limited to – valve cooling unit(s), air
conditioning and/or ventilation system, check of system pressure
to confirm coolant level, piping, water/water coolers, water/air
coolers.
The servicing needs identified by inspection and diagnostic tests are completed
on the filter bank equipment.
Range
3.6
may include but is not limited to – TCRs, CLRs, damping reactors,
thyristor valves, thyristor valve control unit, bushing insulators,
primary connections.
The servicing needs identified by inspection and diagnostic tests are completed
on the cooling system.
Range
3.5
may include but is not limited to – programmable logic controller
(PLC), protection system, control and protection cables, unbalance
CTs, short circuit/overload CTs.
The servicing needs identified by inspection and diagnostic tests are completed
on the reactor equipment.
Range
3.4
may include but is not limited to – on line oil filters checked,
cleaning ceramic bushings, Buchholz relay operation checks,
replacement of oil pump bearings or unit, fan motor repairs,
remove blockages in oil system, check seismic constraints are
secure, oil treatment and re-testing, tap changer inspection and oil
change.
may include but is not limited to – TCCs, fixed filter circuit, MSCs,
bushing insulators, primary connections.
The servicing needs identified by inspection and diagnostic tests are completed
on the auxiliary equipment.
Range
may include but is not limited to – civil works, foundations,
earthing, auxiliary AC and DC supplies, alarms and SCADA.
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3.7
The servicing is completed to client requirements.
3.8
The equipment is re-assembled to the ‘service ready’ state.
Range
may include but is not limited to – all test equipment removed, all
equipment in correct position, all leads re-connected, all primary
and secondary connections secure, oil levels correct, coolant
levels correct and cooling system ready for service, all switches in
correct position, function tests carried out if necessary.
Element 4
Complete documentation in accordance with industry requirements.
Performance criteria
4.1
The ‘as left’ conditions are recorded in the equipment history.
Range
4.2
may include but is not limited to – reporting defects found, spares
used, adjustments made, results of inspections requiring more
extensive maintenance, corrosion corrective work.
The routine inspection, diagnostic testing, and servicing records are completed
to meet client requirements.
Range
may include but is not limited to written records or electronic data
reporting.
Element 5
Return equipment to service in accordance with industry requirements.
Performance criteria
5.1
The equipment is returned to service.
Range
may include but is not limited to – equipment checked for ready for
service, all inspection and servicing tools removed, access
authorisation returned, equipment returned to service without
incident, in-service checks completed.
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.
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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