NZQA registered unit standard
14283 version 4
Page 1 of 6
Title
Carry out tests on distribution oil filled power transformers of 33kV
and below 10 MVA
Level
4
Credits
5
Purpose
People credited with this unit standard are able to: prepare for
testing on distribution oil filled power transformers of 33kV and
below 10 MVA; set up test facilities on distribution oil filled
power transformers of 33kV and below 10 MVA; carry out tests
on distribution oil filled power transformers of 33kV and below
10 MVA; interpret test results and complete compliance
documentation on distribution oil filled power transformers of
33kV and below 10 MVA; and place or return distribution oil
filled power transformers of 33kV and below 10 MVA into
service.
Classification
Electricity Supply > Electricity Supply - Testing
Available grade
Achieved
Entry information
Critical health and
safety prerequisites
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 14700, Apply
and remove safety measures in an electricity supply
environment; Unit 14701, Manage electricity supply work
control systems; Unit 12296, Apply earths to and remove
earths from electrical conductors, plant and equipment; or
demonstrate equivalent knowledge and skills.
Explanatory 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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14283 version 4
Page 2 of 6
2
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 Safety Manual – Electricity Industry (SM-EI) (Wellington:
Electricity Engineers’ Association, 2010). A full list of current legislation and industry
codes is available from the Electricity Supply Industry Training Organisation, PO Box
1245, Hamilton 3240.
3
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
4
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.
5
The range of this unit standard is limited to carrying out tests on single unit and 3
phase unit distribution oil filled power transformers 33kV and below 10 MVA capacity.
Testing is normally applied at electricity supply substations.
6
The following terms and abbreviations relate to this unit standard:
RH % = Relative humidity %
ANSI = American National Standards Institute
IEC
= International Electrotechnical Commission.
Outcomes and evidence requirements
Outcome 1
Prepare for testing on distribution oil filled power transformers of 33kV and below 10 MVA.
Evidence requirements
1.1
The relevant equipment technical specification and performance standards are
selected and interpreted.
Range
1.2
may include but are not limited to – insulation class, rating, type of
transformer, manufacturer or client standards for oil type
transformers.
The test specifications and performance standards are selected.
Range
may include but are not limited to – ANSI-C57, IEC-76, IEC-726
1982.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.3
The selected test circuitry and inspection requirements are identified.
Range
1.4
may include but are not limited to – Buchholz relay test, pressure
relief valve signal test, winding resistance tests, insulation
resistance, oil electric strength, ratio tests, cooling control and
indication test, tap changer position tests, impedance tests,
polarity tests, phasing.
The extent of main equipment to be released from service is identified and
equipment release requested for work access.
Range
1.5
14283 version 4
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may include but is not limited to all release requests being
completed in the required time in accordance with enterprise
requirements.
The inspection and test plan are developed to meet all testing requirements.
Range
may include but is not limited to – personnel doing tests, test
equipment to be used, programme, required outcome from
inspection and tests.
Outcome 2
Set up test facilities on distribution oil filled power transformers of 33kV and below 10
MVA.
Evidence requirements
2.1
Access Permit or its equivalent has been obtained and safe work zone
identified.
Range
2.2
The necessary circuit and test equipment are correctly assembled according to
the standard test circuit diagram.
Range
2.3
may include but is not limited to – making release applications in a
timely manner in accordance with enterprise requirements,
identifying safe work area with boundary ropes and signs.
may include but is not limited to – test equipment being checked
for correct connection, test leads free of damage and suitable for
the purpose.
The standard test and inspection procedures are available for use during
testing.
Range
may include but are not limited to client required procedures,
manufacturer’s procedures or manuals.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.4
Accuracy of test instrument calibrations is checked as required by test
procedures.
Range
2.5
14283 version 4
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may include but is not limited to all test equipment being checked
to ensure calibration certification is valid.
Any hazards associated with the testing are identified and safety measures are
prepared and implemented.
Range
may include but are not limited to – safety to personnel and the
environment, oil spill containment.
Outcome 3
Carry out tests on distribution oil filled power transformers of 33kV and below 10 MVA.
Evidence requirements
3.1
The selected tests are carried out using the standard procedures.
Range
3.2
may include but are not limited to client provided requirements or
manufacturer procedures for tests listed – Buchholz relay tests,
pressure relief valve signal test, winding resistance tests,
insulation resistance, oil electric strength, ratio tests, cooling
control and indication test, tap changer position tests, impedance
tests, polarity tests, phasing;
evidence required – must be able to competently perform any
seven of the listed tests.
The results of the tests and inspections are recorded in accordance with
enterprise and client requirements.
Range
may include but are not limited to – accurate measurements
recorded, other relevant conditions, recorded temperature, RH %,
time, instrument used.
Outcome 4
Interpret test results and complete compliance documentation on distribution oil filled
power transformers of 33kV and below 10 MVA.
Evidence requirements
4.1
The documented test results are correctly interpreted and analysed against the
standard required.
Range
may include but are not limited to – checking test results against
relevant international standards, measurement uncertainty, limits
of accuracy, name plate data, manufacturer’s specifications,
previous history for similar equipment.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4.2
14283 version 4
Page 5 of 6
Compliance or non-compliance documentation is completed for each unit
tested.
may include but is not limited to – written reports, test results
within accepted standard, recommendations for correcting noncompliant equipment, degree of non-compliance.
Range
Outcome 5
Place or return distribution oil filled power transformers of 33kV and below 10 MVA into
service.
Evidence requirements
5.1
The equipment being tested is safely placed in or returned to service.
may include but is not limited to – careful checks of the test area to
ensure all test equipment and leads have been removed, main
leads are reinstated correctly, the work party work permit or
equivalent has been returned, return of transformer service without
incident.
Range
Planned review date
31 December 2015
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
27 April 1998
N/A
Revision
2
11 February 2004
N/A
Review
3
21 November 2008
N/A
Review
4
22 October 2010
N/A
Accreditation and Moderation Action Plan (AMAP) reference
0120
This AMAP 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, 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 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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14283 version 4
Page 6 of 6
Consent 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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016