NZQA registered unit standard 14272 version 4 Page 1 of 5

Electricity Supply Industry Training Organisation SSB Code 101813

© New Zealand Qualifications Authority 2011

Title Carry out maintenance and/or acceptance tests on high voltage circuit breakers

Level 4 Credits 6

Purpose People credited with this unit standard are able to: prepare to test high voltage circuit breakers for maintenance and/or acceptance; set up test equipment; carry out maintenance and/or acceptance tests on high voltage circuit breakers; 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

Recommended skills and knowledge

Unit 14287, Use and maintain test instruments used within the high voltage electrical industry; and Unit 14294, Carry out insulating oil sampling and voltage breakdown tests

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.

NZQA registered unit standard 14272 version 4 Page 2 of 5

Electricity Supply Industry Training Organisation SSB Code 101813

© New Zealand Qualifications Authority 2011

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 tests on a range of high voltage

circuit breakers. Testing is normally applied at electricity supply substations. 8 Definitions SF6 = Sulphur Hexafloride Gas GIS = Gas Insulated Switchgear. Outcomes and evidence requirements Outcome 1 Prepare to test high voltage circuit breakers for maintenance and/or acceptance. Evidence requirements 1.1 The equipment technical specification and performance standards are selected

and interpreted in terms of client test requirements.

Range may include but is not limited to – bulk oil, minimum oil, SF6, air blast, vacuum, metal clad, pole mounted recloser and GIS circuit breaker types; rating, method of operation, relevant drawings.

1.2 The test specifications and performance standards are selected in terms of

client test requirements.

Range may include but is not limited to – operation timing, minimum operating voltage, insulation test, power factor, contact resistance, function tests, pole discrepancy, anti-pumping checks, trip tests, auxiliary contacts tested, liquid or gas insulation electric strength, protection operation tests;

evidence is required of preparation for six types of tests. 1.3 The selected test circuitry and inspection requirements are identified in terms of

client test requirements.

Range may include but is not limited to – equipment necessary for carrying out the selected tests, trip and close circuits are identified in mechanism cabinet, control circuit is identified as isolated.

NZQA registered unit standard 14272 version 4 Page 3 of 5

Electricity Supply Industry Training Organisation SSB Code 101813

© New Zealand Qualifications Authority 2011

1.4 The extent of main equipment to be released from service is identified and equipment operational release is requested for the testing work.

Range includes but is not limited to – completing all operational requests

in a timely and correct manner. 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 may include but is not limited to – placing boundary markers around the work area, identifying secondary de-energising required to make the testing work safe.

2.2 The selected circuit and test equipment is assembled to be ready for testing.

Range may include but is not limited to – in accordance with manufacturer’s guidelines, client operating and maintenance standards and testing procedures;

includes – an inspection of test equipment. 2.3 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 card, manufacturer’s information and operating procedures.

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 may include but are not limited to – charged capacitors, auxiliary services, high pressure systems, risk of trip to other equipment and alarms, control circuits and interlocks;

safety measures include but are not limited to – discharged capacitors, isolated auxiliary services, isolated high pressure systems, identified risk of trip to other equipment and alarms, identified control circuits and interlocks.

NZQA registered unit standard 14272 version 4 Page 4 of 5

Electricity Supply Industry Training Organisation SSB Code 101813

© New Zealand Qualifications Authority 2011

Outcome 3 Carry out maintenance and/or acceptance tests on high voltage circuit breakers. Evidence requirements 3.1 Six tests are carried out in accordance with the standard procedures and

following the commissioning plan, or as specified by the client.

Range may include but is not limited to – operation timing, minimum operating voltage, insulation test, power factor, contact resistance, function tests, pole discrepancy, anti-pumping checks, trip tests, auxiliary contacts tests, liquid or gas insulation electric strength, protection operation tests.

3.2 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 may include but is not limited to – reference to manufacturer’s requirements, client standards, records of previous results, ensure results are within given specifications.

4.2 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.

Outcome 5 Place equipment in, or return equipment to, service. Evidence requirements 5.1 The equipment being tested is safely placed in, or returned to, service.

Range 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.

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Electricity Supply Industry Training Organisation SSB Code 101813

© New Zealand Qualifications Authority 2011

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. 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.