14337 version 2
28-Jun-16
1 of 9
ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
level:
4
credit:
6
planned review date:
December 2006
sub-field:
Electricity Supply
purpose:
People credited with this unit standard are able to: prepare
for inspection, testing and servicing on high voltage minimum
oil circuit breakers; make the circuit breakers safe for work;
carry out routine inspections and diagnostic tests; carry out
servicing; perform function tests and pre-service checks; and
complete documentation.
entry information:
Prerequisites: Unit 14287, Use and maintain test instruments
used in high voltage electrical industry; Unit 14294, Carry out
insulating oil sampling and voltage breakdown tests; Unit
14700, Apply and remove safety measures in an electricity
supply environment; Unit 14701, Manage electricity supply
work control system; Unit 12296, Apply earths to and remove
earths from electrical conductors, plant, and equipment; or
demonstrate equivalent knowledge and skills.
Core electrical theory is essential knowledge underpinning
the performances required by this unit standard.
accreditation option:
Evaluation of documentation and visit by NZQA and industry.
moderation option:
A centrally established and directed external moderation
system has been set up by the Electricity Supply Industry
Training Organisation.
 New Zealand Qualifications Authority 2016
14337 version 2
28-Jun-16
2 of 9
ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
special notes:
1
This unit standard can be assessed 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, codes of practice recognised
under that statute, Health and Safety in Employment
Act 1992, Building Act 1991, Resource Management
Act 1991, and their subsequent amendments; Electricity
Regulations 1997, Safety Rules Electricity Industry:
Safety Rules for the New Zealand Electricity
Generation, Transmission and Distribution Industry.
(2000) Wellington: Electricity Engineers’ Association of
NZ (SR-EI), and General Safety Guide Electricity
Industry: Guidance on General Safety in the New
Zealand Electricity Generation, Transmission and
Distribution Industry. (2000) Wellington: Electricity
Engineers’ Association of NZ (GSH-EI); Electricity
Engineers’ Association Codes of Practice; Occupational
Safety and Health Approved Codes of Practice; New
Zealand Electrical Codes of Practice (NZECP). A full
list of current legislation and industry codes is available
from:
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.
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14337 version 2
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
4
All work practices shall meet documented enterprise
maintenance standards, including the quality
management requirements, and the documentation of
activities, events, and decisions.
5
The range of this unit standard is limited to carrying out
diagnostic testing and applying preventative
maintenance and replacement repairs where necessary
on high voltage minimum oil circuit breakers, and is
normally done at electricity supply substations.
6
The following terms and abbreviations relate to this unit
standard:
CB
=
Circuit breaker.
Elements and Performance Criteria
element 1
Prepare for inspection, testing and servicing on high voltage minimum oil circuit breakers.
performance criteria
1.1
The scope of work and equipment to be serviced is identified from client
requirements.
Range:
may include but not limited to associated ‘check and/or inspection
lists’, procedures and client required diagnostic tests and servicing
for - minimum oil circuit breakers, with pneumatic, hydraulicspring, motor-spring or solenoid mechanisms.
 New Zealand Qualifications Authority 2016
14337 version 2
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
1.2
Personnel and equipment are resourced for the required work.
Range:
1.3
may include but not limited to - people, tools, spares, materials,
‘inspection sheets’, procedure sheets.
The inspection, diagnostic testing and servicing requirements are interpreted,
and analysed for determining the performance and quality standards required.
Range:
may include but not limited to - manufacturer’s guidelines, client
maintenance standards or enterprise guidelines.
element 2
Make the circuit breakers safe for work.
performance criteria
2.1
The required access permit, or recognised equivalent, is received, checked, and
signed in accordance with the industry and enterprise requirements.
Range:
2.2
includes a careful check of the isolations to ensure the access
permit or recognised equivalent provides a safe work environment.
Additional isolation from other energy sources on the circuit breaker is applied.
Range:
may include but not limited to - releasing or spragging spring
closing energy systems, isolating actuating trip coils and motor
drive systems, release or isolation of hydraulic or pneumatic
pressure systems.
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
2.3
The work party is fully briefed on the equipment to be worked on, work to be
done, safe working zone and safety features in place, and has signed the
access permit or its approved equivalent. All communication with the work
party is clear and unambiguous.
Range:
2.4
may include but not limited to the ability to resolve any concerns
the work party may have over the isolations and the delineation of
the safe work area.
Safety measures are available and prepared to protect the environment and
personnel.
Range:
may include but not limited to - oil spill clean up facilities,
protective clothing, storage facilities.
element 3
Carry out routine inspections and diagnostic tests.
performance criteria
3.1
The CB defect history and operational records are scrutinised and incidents
indicating service needs noted for attention during the routine servicing.
Range:
3.2
may include but not limited to - serious fault interruptions,
malfunction, reported problems, thermovision inspection results.
The inspections carried out identify any damage or defects.
Range:
may include but not limited to - oil leaks, signs of overheating.
 New Zealand Qualifications Authority 2016
14337 version 2
28-Jun-16
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
3.3
The diagnostic tests are carried out and the results analysed for interpreting the
servicing required.
Range:
3.4
may include but not limited to - oil breakdown tests, insulation
resistance tests, time travel tests, contact resistance, timing tests,
minimum operating voltage, trip tests, auxiliary contact tests, oil
insulation tests, alarm and pressure settings, compressor pump up
time.
The results of the diagnostic tests are recorded to meet the client requirements.
Range:
may include but not limited to - completing enterprise check lists,
electronic data records, client reports.
element 4
Carry out servicing.
performance criteria
4.1
Oil recovery and treatment are completed, consistent with enterprise or client
requirements.
Range:
4.2
may include but not limited to storage treatment and re-testing
before re-filling the circuit breakers.
The minor invasive servicing is carried out following enterprise or client
procedures.
Range:
may include but not limited to - insulating oil replacement top-up,
‘repairs to’ or ‘replacement of’ worn parts, adjustments, contact tip
replacement, cleaning, lubricating, hydraulic control and
mechanism serviced.
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
4.3
The re-assembly of the circuit breaker is carried out in the approved manner
provided by the maker.
Range:
may include but not limited to - all components being assembled in
the correct order, with proper fit and secured in the specified way,
oil replaced into circuit breaker to correct level and quality.
element 5
Perform function tests and pre-service checks.
performance criteria
5.1
Work party is advised of a trial operation about to start.
5.2
All services and necessary control features are reinstated and approval
obtained for function tests.
Range:
5.3
may include but not limited to - air service, control circuits,
mechanism, power, indication.
All the function tests required are completed without malfunction and to
standard.
Range:
may include but not limited to -oil breakdown tests, insulation
resistance tests, time travel tests, contact resistance, timing tests,
minimum operating voltage, trip tests, auxiliary contact tests, oil
insulation tests, alarm and pressure settings, compressor pump up
time.
 New Zealand Qualifications Authority 2016
14337 version 2
28-Jun-16
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
5.4
All the maintenance tools and facilities are removed and the circuit breaker is
left in the ‘ready-for-service’ condition.
Range:
5.5
All equipment worked on is inspected and set for return to service.
Range:
5.6
may include but not limited to - checking all tools removed, all
connections tight, all panels returned, all valves set to ‘in-service’
position, service, maintenance switch in correct position, CB
returned to service.
may include but not limited to - confirming all equipment and the
work party are clear, all operational equipment which has been
worked on is now set ready for service.
Return of access permit, or its equivalent, is confirmed.
Range:
may include but not limited to - confirming all members of the work
party have signed off, the equipment is returned to service without
incident.
element 6
Complete documentation.
performance criteria
6.1
The ‘as found’ and ‘as left’ conditions are recorded in the plant history.
Range:
may include but not limited to - analysis and reporting of any
defects, correct completion of the plant and defect history,
including replacement spares fitted.
 New Zealand Qualifications Authority 2016
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ELECTRICITY SUPPLY - POWER
SYSTEM MAINTENANCE
Carry out routine inspection and
servicing on high voltage minimum oil
circuit breakers
6.2
The equipment condition status is recorded.
Range:
6.3
may include but not limited to - operation counter noted, number of
trial operations noted, pressures and auxiliary services quantified.
The routine and inspection service records are completed to meet the client
requirements.
Range:
may include but not limited to written records or electronic data
reporting.
Comments on this unit standard
Please contact the Electricity Supply Industry Training Organisation ceo@esito.org.nz if
you wish to suggest changes to the content of this unit standard.
Please Note
Providers must be accredited by the Qualifications Authority or a delegated interinstitutional body before they can register 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 providers wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
This unit standard is covered by AMAP 0120 which can be accessed at
http://www.nzqa.govt.nz/site/framework/search.html.
 New Zealand Qualifications Authority 2016