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Install and commission voltage transformer metering in the electricity
supply industry
Level
4
Credits
12
Purpose
People credited with this unit standard are able to: demonstrate knowledge of
the design and application of voltage transformers (VT) utilised in revenue
metering; determine VT ratio and class of operation; determine VT
installation integrity; install and commission VT metering equipment; and
report VT installation and commission results.
Subfield
Electricity Supply
Domain
Electricity Supply - Metering
Status
Registered
Status date
27 May 2002
Date version published
23 April 2007
Planned review date
31 December 2012
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Electricity Supply Industry Training Organisation
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 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 a priority throughout the assessment. If the
safety requirements are not met the assessment must stop and the candidate will be
assessed as not yet competent.
 New Zealand Qualifications Authority 2016
19319 version 3
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3
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. A full list of current legislation and industry codes is
available from the Electricity Supply Industry Training Organisation, PO Box 1245,
Hamilton.
4
‘Industry requirements’ include all industry and workplace documented policies,
procedures, specifications, business, and quality management requirements relevant
to the workplace in which assessment is carried out.
5
Practical exercises should be used for training and assessment wherever possible.
Elements and performance criteria
Element 1
Demonstrate knowledge of the design and application of VT utilised in revenue metering.
Performance criteria
1.1
The types of VT are described in accordance with industry requirements.
Range
1.2
includes but is not limited to – single-phase, three-phase three
limb, three-phase five limb, capacitive voltage transformers.
The design, application and use of VT are described in accordance with industry
requirements.
Range
includes but is not limited to – design and application of voltage
transformers in both two and three element metering, ratios,
burden ratings, class of operation, primary and secondary
earthing, polarity and phasing, terminations and test blocks.
1.3
Multipliers and compensation for VT ratios are described in accordance with
industry requirements.
1.4
The limitations of multiple devices connected to VT circuits are described in
accordance with industry requirements.
Range
1.5
includes but is not limited to – secondary burden, VT accuracy.
VT secondary short circuit dangers and precautions are described in
accordance with industry requirements.
 New Zealand Qualifications Authority 2016
19319 version 3
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Element 2
Determine VT ratio and class of operation.
Performance criteria
2.1
VT ratios are selected in accordance with industry requirements.
2.2
VT class of operation is determined in accordance with industry requirements.
Element 3
Determine VT installation integrity.
Performance criteria
3.1
Required loadings are captured in accordance with industry requirements.
3.2
Access to equipment is checked in accordance with industry requirements.
Range
3.3
VT installation integrity is determined and recorded in accordance with industry
requirements.
Range
3.4
includes but is not limited to – sealing of equipment, tampering
devices.
may include but is not limited to – safety, design criteria upheld,
documentation, insulation determination, winding resistance,
earthing requirements.
Equipment mounting and positioning is checked in accordance with industry
requirements.
Range
includes but is not limited to – secure mountings, electrical
clearances, terminal safeguarding and shrouds.
Element 4
Install and commission VT metering equipment.
Performance criteria
4.1
VT metering equipment is installed in accordance with industry requirements.
Range
may include but is not limited to – VT mounting, primary earthing,
secondary earthing, secondary wiring and sealing, primary fusing,
secondary fusing.
 New Zealand Qualifications Authority 2016
19319 version 3
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4.2
VT metering equipment is commissioned in accordance with industry
requirements.
Range
includes but is not limited to – polarity tests, phasing tests, burden
measurements, load checks (prevailing), ratio checks, insulation
resistance measurement, phase angle measurement.
Element 5
Report VT installation and commission results.
Range
may include but is not limited to – job sheet, installation reports and results.
Performance criteria
5.1
Reported information is completed and processed in accordance with industry
requirements.
5.2
Installation and commissioning information is recorded in the required format
and filed within the scheduled time-frame in accordance with industry
requirements.
5.3
Further action required for plant and equipment is identified, recorded, and
communicated to appropriate personnel in accordance with industry
requirements.
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.
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