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19316 Design a current transformer (CT) electricity meter installation

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19316 Design a current transformer (CT) electricity meter installation

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    Design a current transformer (CT) electricity meter installation

Level 5

    Credits 12

    Purpose People credited with this unit standard are able to: demonstrate knowledge of

    electricity metering installation design; prepare scope of work for electricity

    metering installation design; calculate theoretical values for electricity meters;

    select electricity meters for installation; and produce and amend electricity

    metering design drawings.

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 19309, Install electricity metering

    control relays; Unit 19311, Install electricity metering

    poly-phase whole current meters; Unit 19313,

    Demonstrate knowledge of electricity metering systems

    and installations; Unit 19314, Programme electricity

    meter data loggers in the electricity supply industry; 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.

     ; New Zealand Qualifications Authority 2012

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    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.

    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 Low voltage (LV) covers up to 400 volts.

Elements and performance criteria

Element 1

Demonstrate knowledge of electricity metering installation design.

Performance criteria

    1.1 Wiring materials and connection blocks are described in accordance with

    industry requirements.

    Range includes but is not limited to conductor size and type, rating.

    1.2 Wiring numbering allocation requirements are described in accordance with

    industry requirements.

    1.3 Generic design drawings and standards are described in accordance with

    industry requirements.

    1.4 Selection and application of fuses for metering installations is described in

    accordance with industry requirements.

    Range may include but is not limited to LV fusing, sub-circuit fusing,

    accessory fusing, types of fuses, fuse holders.

    1.5 Fusing characteristics for current discrimination are described in accordance

    with industry requirements.

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    Element 2

    Prepare scope of work for electricity metering installation design.

Performance criteria

    2.1 Scope of work is prepared in accordance with industry requirements.

    Range includes but is not limited to legislative requirements, customer

    requirements.

    2.2 Permissible load is assessed in accordance with industry requirements.

    Range may include but is not limited to selection of current transformer

    ratios, range selection, overload considerations.

    2.3 Current transformer class and burdens are applied in accordance with industry

    requirements.

    Range includes but is not limited to manufacturer’s specifications,

    accuracy and ratio to suit design.

Element 3

Calculate theoretical values for electricity meters.

Range current transformer burden, loadings.

Performance criteria

    3.1 Electricity meter theoretical values are calculated in accordance with industry

    requirements.

    3.2 Maximum demand of metering installation is determined in accordance with

    industry requirements.

    Range maximum load, initial load, ultimate load, maximum permissible

    load.

Element 4

Select electricity meters for installation.

Range includes but is not limited to current transformer compatibility.

Performance criteria

    4.1 Meter is selected in accordance with installation and industry requirements.

    Range includes but is not limited to manufacturers’ specifications,

    installation requirements, meter inputs and outputs, class of

    operation, integral data loggers.

     ; New Zealand Qualifications Authority 2012

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    4.2 Meter communication principles are applied to meter selection in accordance

    with industry requirements.

    Range may include but is not limited to modems, communications

    networks, cellular, Local Area Network (LAN), line, approved type,

    security, modem selection, communication protocol.

Element 5

Produce and amend electricity metering design drawings.

Performance criteria

    5.1 Key meter installation requirements are defined in accordance with industry

    requirements.

    Range includes but is not limited to fuses, wiring, meters, numbering

    systems, communication equipment.

    5.2 Electricity metering installation drawings, symbols and polarity markings are

    produced, interpreted and amended in accordance with industry requirements.

    Range may include but is not limited to current transformer polarity,

    indoor or outdoor equipment, switchboard components, meter

    installation components.

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 2012

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