NZQA registered unit standard
14273 version 4
Page 1 of 6
Title
Carry out maintenance and commissioning tests on instrument
transformers
Level
4
Credits
5
Purpose
People credited with this unit standard are able to: prepare to
test instrument transformers for maintenance and/or
commissioning acceptance; set up test equipment; carry out
maintenance and/or commissioning acceptance tests on
instrument transformers; interpret test results and complete
compliance documentation; and place equipment in, or return
equipment to, 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, or demonstrate equivalent
knowledge and skills.
Explanatory 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.
2
Safety of personnel and plant must be prioritised during assessment against this unit
standard. If the client safety requirements are not met assessment must stop.
3
Performance of the 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, Hamilton 3240.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14273 version 4
Page 2 of 6
4
The phrase in accordance with industry requirements applies to all of the evidence
requirements in this unit standard.
5
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements. Enterprise requirements may include
the documented workplace policies, procedures, specifications, business, and quality
management requirements relevant to the workplace in which assessment is carried
out.
6
Practical exercises should be used for assessment wherever possible.
7
This unit standard covers carrying out maintenance and commissioning tests on
instrument transformers. Testing is normally applied at electricity supply substations
or power stations.
8
Definitions
CVTs = Capacitive Voltage Transformers
CTs = Current Transformers.
Outcomes and evidence requirements
Outcome 1
Prepare to test instrument transformers for maintenance and/or commissioning
acceptance.
Evidence requirements
1.1
The equipment technical specification and performance standards are selected
and interpreted in terms of client testing requirements.
Range
1.2
The test specifications and performance standards are selected in terms of
client testing requirements.
Range
1.3
may include but is not limited to – instrument transformer type,
rating, method of operation, relevant drawings.
may include but is not limited to – ratio tests, phase angle tests,
insulation resistance tests, winding resistance tests, capacitor
divider checks, primary injection, burden tests, loading resistance
tests, visual inspection, verification of winding markings, polarity of
windings, CVTs, power factor;
evidence is required of preparation for six types of tests.
The selected test circuitry and inspection requirements are identified in terms of
client testing requirements.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.4
The extent of main equipment to be released from service is identified and the
equipment operational release is requested for the testing work.
Range
1.5
14273 version 4
Page 3 of 6
includes but is not limited to – completing all requests in a timely
and correct manner.
An inspection and commissioning test plan is prepared which meets
requirements.
Range
requirements may include but are not limited to – test personnel,
test equipment, programme, required outcomes.
Outcome 2
Set up test equipment.
Evidence requirements
2.1
An access permit, or its approved equivalent, is obtained and a safe work zone
is identified.
Range
2.2
The selected circuit and test equipment is assembled to be ready for testing.
Range
2.3
may include but is not limited to – placing boundary markers
around the work area, identifying responsibility for safe work zone.
may include but are not limited to – manufacturer’s guidelines,
client operating and maintenance standards, test procedures,
inspection of test equipment.
The selected test procedures are obtained from previous testing and are made
available for use during testing
Range
may include but are not limited to – previous test results, history
cards, manufacturer’s information and manuals.
2.4
All test equipment is checked to ensure that the calibration certification is valid.
2.5
Any hazards associated with the testing are identified and safety measures are
prepared and implemented.
Range
hazards include but are not limited to – charged capacitors,
auxiliary services, risk of trip for other equipment and alarms,
control circuits, open circuit CTs;
safety measures include but are not limited to – discharged
capacitors, isolated auxiliary services, identified risk of trip for
other equipment and alarms, earthed open circuit CTs.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14273 version 4
Page 4 of 6
Outcome 3
Carry out maintenance and/or commissioning acceptance tests on instrument
transformers.
Evidence requirements
3.1
The selected tests are carried out in accordance with the standard procedures
and commissioning plan, or as specified by the client.
Range
3.2
may include but are not limited to – ratio tests, phase angle tests,
insulation resistance tests, winding resistance tests, capacitor
divider checks, primary injection tests, burden tests, loading
resistance tests, visual inspection, verification of winding
markings, polarity of windings, CVTs, power factor;
evidence of six completed tests is required.
The results of the tests and inspections are recorded as required by standard
documentation or as specified by the client.
Outcome 4
Interpret test results and complete compliance documentation.
Evidence requirements
4.1
The documented test results are interpreted and analysed for compliance with
the standard required.
Range
4.2
may include but is not limited to – reference to manufacturer’s
requirements, client standards, records of previous results, ensure
results are within given specifications.
Compliance or non-compliance documentation is completed for each unit
tested.
Range
may include but is not limited to – manufacturer’s requirements,
client documentation requirements, recommendations for remedial
work.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14273 version 4
Page 5 of 6
Outcome 5
Place equipment in, or return equipment to, service.
Evidence requirements
5.1
The equipment tested is safely placed in, or returned to, service.
includes but is not limited to checks to ensure – all test equipment
and leads have been removed; all reconnection work is
completed; main leads are reinstated correctly, checked and
secure; all equipment is left in a state ready for service; the access
permit is returned; the equipment is returned to 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
31 December 2012
Revision
2
11 February 2004
31 December 2012
Review
3
19 May 2006
31 December 2012
Review
4
8 December 2011
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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14273 version 4
Page 6 of 6
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