19472 version 3

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Install and commission high voltage (HV) electricity current transformer metering

Level / 4
Credits / 10

PurposePeople 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

Special notes

1This 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.

2Safety 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.

3Performance 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.

5Practical 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.

Rangeincludes but is not limited to – 2 element meter, 3 element meter.

Performance criteria

1.1The types of high voltage CT are described in accordance with industry requirements.

Rangeincludes but is not limited to – bar, ring, single and multi-ratio, summation metering, protection.

1.2The design of high voltage CT is described in accordance with industry requirements.

Rangeincludes 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.

1.3The application and use of high voltage CT is described in accordance with industry requirements.

Rangeincludes but is a not limited to – metering, protection, instruments, terminations and test block.

1.4Multipliers and compensation for high voltage CT ratios is described in accordance with industry requirements

Rangeincludes but is not limited to – criteria for current range selection, matching CT to load, compensation application.

1.5Open 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

2.1Ratios are selected in accordance with industry requirements.

Rangeincludes but is not limited to – basis for CT matching to loads.

2.2Class of operation is determined in accordance with industry requirements.

Rangeincludes but is not limited to – selection of CT class to suit metering accuracy.

Element 3

Determine high voltage CT installation integrity.

Performance criteria

3.1Required loadings are captured in accordance with industry requirements.

Rangeincludes but is not limited to – primary and secondary loads measures.

3.2Equipment mounting and positioning is checked in accordance with industry requirements.

Rangeincludes but is not limited to – secure mountings, electrical clearances terminal safeguarding and shrouds.

3.3Access to equipment is checked in accordance with industry requirements.

Rangeincludes but is not limited to – sealing, prevention of unauthorised access.

3.4Overall installation diagnosis is determined and recorded in accordance with industry requirements.

Rangeincludes 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

4.1High voltage CT metering equipment is installed in accordance with industry requirements.

Rangeincludes but is not limited to – wiring compliance, earthing, mounting, CT classes, burden measurements, ratio selection.

4.2High voltage CT metering equipment is commissioned in accordance with industry requirements.

Rangeincludes but is not limited to – polarity tests, burden measurements, prevailing load tests.

Element 5

Report high voltage CT installation and commissioning results.

Rangejob sheet, installation reports and results.

Performance criteria

5.1Reported information is completed and processed in accordance with industry requirements.

5.2Installation and commissioning information is recorded in the required format and filed within the scheduled time-frame in accordance with industry requirements.

5.3Further 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 you wish to suggest changes to the content of this unit standard.

 New Zealand Qualifications Authority 2018