19472 version 3
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Install and commission high voltage (HV) electricity current transformer
metering
Level
4
Credits
10
Purpose
People credited with this unit standard are able to: demonstrate knowledge of
the design and application of high voltage current transformer (CT) meters;
determine high voltage CT loadings; diagnose high voltage CT installation
integrity; install and commission high voltage CT metering equipment; report
high voltage CT installation and commissioning 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
Recommended: Unit 19313, Demonstrate knowledge of
electricity metering systems and installations, or
demonstrate equivalent knowledge and skills.
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.
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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.
6
‘High voltage’ is defined as over 400 volts.
Elements and performance criteria
Element 1
Demonstrate knowledge of the design and application of high voltage CT meters.
Range
includes but is not limited to – 2 element meter, 3 element meter.
Performance criteria
1.1
The types of high voltage CT are described in accordance with industry
requirements.
Range
1.2
The design of high voltage CT is described in accordance with industry
requirements.
Range
1.3
includes but is not limited to – bar, ring, single and multi-ratio,
summation metering, protection.
includes but is not limited to – comparison of 1 amp and 5 amp
secondaries, variance analysis output, high and low ratios, short
circuit withstand, burden ratings, class of operation.
The application and use of high voltage CT is described in accordance with
industry requirements.
Range
includes but is a not limited to – metering, protection, instruments,
terminations and test block.
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1.4
Multipliers and compensation for high voltage CT ratios is described in
accordance with industry requirements
Range
1.5
includes but is not limited to – criteria for current range selection,
matching CT to load, compensation application.
Open circuit dangers and precautions for CT installations are identified and
described in accordance with industry requirements.
Element 2
Determine high voltage CT loadings.
Performance criteria
2.1
Ratios are selected in accordance with industry requirements.
Range
2.2
includes but is not limited to – basis for CT matching to loads.
Class of operation is determined in accordance with industry requirements.
Range
includes but is not limited to – selection of CT class to suit
metering accuracy.
Element 3
Determine high voltage CT installation integrity.
Performance criteria
3.1
Required loadings are captured in accordance with industry requirements.
Range
3.2
Equipment mounting and positioning is checked in accordance with industry
requirements.
Range
3.3
includes but is not limited to – primary and secondary loads
measures.
includes but is not limited to – secure mountings, electrical
clearances terminal safeguarding and shrouds.
Access to equipment is checked in accordance with industry requirements.
Range
includes but is not limited to – sealing, prevention of unauthorised
access.
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3.4
Overall installation diagnosis is determined and recorded in accordance with
industry requirements.
Range
includes but is not limited to – safety, design criteria upheld,
documentation, insulation determination, winding resistance,
earthing requirements.
Element 4
Install and commission high voltage CT metering equipment.
Performance criteria
4.1
High voltage CT metering equipment is installed in accordance with industry
requirements.
Range
4.2
includes but is not limited to – wiring compliance, earthing,
mounting, CT classes, burden measurements, ratio selection.
High voltage CT metering equipment is commissioned in accordance with
industry requirements.
Range
includes but is not limited to – polarity tests, burden
measurements, prevailing load tests.
Element 5
Report high voltage CT installation and commissioning results.
Range
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.
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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