NZQA registered unit standard
14294 version 4
Page 1 of 5
Title
Carry out insulating oil sampling and voltage breakdown tests
Level
3
Credits
3
Purpose
People credited with this unit standard are able to: prepare for
the sampling of insulating oil and voltage breakdown tests;
carry out insulating oil sampling and voltage breakdown tests;
interpret test results and complete compliance documentation;
and demonstrate knowledge of oil quality specifications when
replacement oil is required after taking a sample.
Classification
Electricity Supply > Electricity Supply - Testing
Available grade
Achieved
Explanatory notes
1
Assessment against this unit standard typically occurs in a workplace environment.
Assessment can take place in a training or educational environment (or in a
combination of both workplace and training or educational environments) if simulated
equipment response and examples are available.
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.
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 which cover the documented workplace
policies, procedures, specifications, business, and quality management requirements
relevant to the workplace in which assessment is carried out.
6
All work practices must meet documented client maintenance standards including
quality management requirements, and documentation of activities, events, and
decisions.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14294 version 4
Page 2 of 5
7
This unit standard covers carrying out sampling of oil from equipment typically
located at substations and carrying out basic voltage breakdown tests using
proprietary equipment. Please note that this unit standard does not cover high-level
chemistry laboratory testing of oil.
8
Definitions
BS
=
IEC
=
British Standards
International Electrotechnical Commission.
Outcomes and evidence requirements
Outcome 1
Prepare for insulating oil sampling and voltage breakdown tests.
Evidence requirements
1.1
The technical specifications and performance standard for the class of oil being
tested are selected and interpreted.
Range
1.2
The required test procedure and sampling requirements are selected in terms of
client requirements.
Range
1.3
may include but is not limited to – manufacturer’s information, oil
supplier’s data, client’s required standards, international standards
BS EN 60296:2004 Fluids for electrotechnical applications.
Unused mineral insulating oils for transformers and switchgear,
IEC 60422 Mineral insulating oils in electrical equipment –
Supervision and maintenance guidance,
BS EN 60156: 1996 Insulating liquids. Determination of the
breakdown voltage at power frequency. Test method,
IEC 60156 Insulating liquids – Determination of the breakdown
voltage at power frequency – Test method.
may include but is not limited to – client standards or guidelines for
cleaning sample vessels, use of syringes, taking oil samples,
volume of oil required, settling and test voltage application,
equipment to be removed from service.
The test equipment is cleaned and dryed prior to testing in accordance with
internal standards and client requirements.
Range
may include but is not limited to – the requirements of BS EN
60296:2004 Fluids for electrotechnical applications. Unused
mineral insulating oils for transformers and switchgear; IEC 60422
Mineral insulating oils in electrical equipment – Supervision and
maintenance guidance standards.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14294 version 4
Page 3 of 5
Outcome 2
Carry out insulating oil sampling and voltage breakdown tests.
Evidence requirements
2.1
The oil sample is taken from the equipment in accordance with client or other
accepted guidelines.
Range
2.2
A basic voltage breakdown test is applied in a controlled way using a minimum
of six client-approved test procedures.
Range
2.3
may include but is not limited to – minimum oil volume
precleaning at sample point, discharge before sampling, flow rate
into test vessel, sitting time, recorded temperature and relative
humidity, use of appropriate sampling equipment, recognise when
replacement oil is required.
may include but is not limited to – the rate of voltage increase by
time, steady voltage period
The results of the tests and inspections are recorded as required by client
documentation.
Outcome 3
Interpret test results and complete compliance documentation.
Evidence requirements
3.1
The documented test results are interpreted and analysed for compliance with
the standard required.
Range
3.2
Compliance or non-compliance documentation is completed for each test.
Range
3.3
may include but is not limited to – reference to equipment
manufacturer’s requirements; client standards; international
standards and previous test results recorded; ensure results are
within given specifications; implications are noted if moisture,
carbon, or other particles appear in sample
may include but is not limited to – meeting client documentation
requirements, recommendations for remedial work.
The results of the test reports are promptly forwarded to management or client.
Range
may include but is not limited to – preliminary verbal report, written
report.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14294 version 4
Page 4 of 5
Outcome 4
Demonstrate knowledge of oil quality specification when replacement oil is required after
taking a sample.
Evidence requirements
4.1
The oil quality specification for the replacement oil is defined in terms of its
characteristics.
may include but is not limited to – class of oil, breakdown test,
moisture content, dissolved gas, air in suspension.
Range
4.2
The procedures and equipment for replacing the oil are identified and defined in
terms of preserving oil quality and equipment safety.
may include but is not limited to – testing equipment, reinjection
equipment, degassing equipment, safety requirements.
Range
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
Rollover and
Revision
3
20 June 2008
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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
14294 version 4
Page 5 of 5
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.
Electricity Supply Industry Training Organisation
SSB Code 101813
 New Zealand Qualifications Authority 2016