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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Inspect, test and maintain Medium/High Voltage transformers 
SAQA US ID UNIT STANDARD TITLE
259191  Inspect, test and maintain Medium/High Voltage transformers 
ORIGINATOR
SGB Electrical Engineering & Construction 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 12 - Physical Planning and Construction Electrical Infrastructure Construction 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 4  NQF Level 04 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard replaces: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
113880  Inspect, test and maintain Medium / High Voltage transformers  Level 4  NQF Level 04  Complete 

PURPOSE OF THE UNIT STANDARD 
This unit standard is for persons in the Electrical Engineering; Generation; Distribution; Transmission, Construction and Renewable Energy Sector.

A person credited with this unit standard will be capable of:
  • Inspecting, functional testing and maintaining transformers/on-load tap changers according to manufacturer`s specifications to ensure maximum efficiency and continuity of supply.

    This unit standard will contribute to the full development of the learner within the electrical engineering and construction environment by providing recognition, further mobility and transportability within the field of Physical Planning and Construction. The skills, knowledge and understanding demonstrated within this unit standard are essential for social and economic transformation and upliftment within the electrical engineering and construction environment. 

  • LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    The following knowledge, skills attitude and/or equivalent:
  • Relevant sections in statutory requirements.
  • Select, use and care for basic hand tools.
  • Select, use and care of electrical test instruments.
  • Read and interpret electrical wiring/layout diagrams.
  • Power tools (portable).
  • Inspect, test, maintain and do faultfinding on single/three phase circuits.
  • Inspect, test, maintain and do faultfinding on single/three phase AC machines and control gear.
  • High Voltage regulations for access and supervision. 

  • UNIT STANDARD RANGE 
  • Medium/High Voltage transformers include, but are not limited to 11kV - 132kV types with power ratings of 1MVA and above.
  • Transformer types include, but are not limited to step-up, step-down, regulators, neutral earthing compensators/resistors, current/voltage transformers.
  • Tap selectors include manual and on-load tap changers/diverter switches.
  • Testing includes, but is not limited to manual/automatic operation of mechanisms (tap changers), auxiliaries (fans, pumps) and insulating oil sampling/testing and ensuring electrical testing of windings.
  • Transformer maintenance includes, but is not limited to topping up oil levels, tightening terminations/connections/bolts, treating oil leaks, repairing/replacing contactors, switches, fuse holders, breathers, fans/motors/pumps, gaskets and rubber seals.
  • Tap changer maintenance includes, but is not limited to inspecting, cleaning, lubricating and repairing/replacing components in mechanism boxes, draining tap changer oil, opening, cleaning the unit/contacts and replacing components/gaskets where necessary. 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Plan to maintain Medium/High Voltage transformers. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Planning is done in conjunction with outage scheduling and or maintenance programmes. 

    ASSESSMENT CRITERION 2 
    Planning is integrated with other disciplines and associated equipment. 

    ASSESSMENT CRITERION 3 
    Planning is arranged according to equipment history reports and failure rate. 

    ASSESSMENT CRITERION 4 
    Planning is arranged according to plant availability and customer requirements and network stability. 

    ASSESSMENT CRITERION 5 
    Temporary electric supply from alternative sources is considered and identified and made available for use of equipment during maintenance where appropriate. 

    SPECIFIC OUTCOME 2 
    Prepare to maintain Medium/High Voltage transformers. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Ensure that the Transformer is isolated, earthed and safe to work on and permits received where necessary as per operating regulations for High Voltage systems. 

    ASSESSMENT CRITERION 2 
    Equipment, tools and personal protective equipment needed for maintenance is selected, inspected and checked for functionality and safety prior to commencement of tasks. 

    ASSESSMENT CRITERION 3 
    All components and material required for maintaining transformer is correctly identified, selected and available for use. 

    ASSESSMENT CRITERION 4 
    Test equipment is selected, inspected and checked for functionality and safety prior to maintenance tasks. 

    ASSESSMENT CRITERION 5 
    Appropriate drawings and documentation is obtained and made available prior to commencing maintenance task. 

    ASSESSMENT CRITERION 6 
    Work site/environmental hazards are identified and the appropriate action is taken in line with work site procedures. 

    SPECIFIC OUTCOME 3 
    Inspect, test and maintain Medium/High Voltage transformers. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Personal protective equipment is used and site specific safety procedures are adhered to throughout maintenance. 

    ASSESSMENT CRITERION 2 
    The transformer is visually inspected and defects recorded as per inspection sheets/work instructions. 

    ASSESSMENT CRITERION 3 
    The transformer`s insulating medium is sampled and tested as per applicable standards/procedures to determine insulation values, core deterioration/internal faults and corrective action is initiated where necessary. 

    ASSESSMENT CRITERION 4 
    Ensured that the transformer windings was electrically tested as per site specifications. 

    ASSESSMENT CRITERION 5 
    The transformer mechanisms, auxiliaries and equipment are tested to ensure correct operation under manual and automatic conditions as per manufacturer`s and site specifications. 

    ASSESSMENT CRITERION 6 
    The transformer mechanisms, auxiliaries and equipment are maintained according to job procedures/maintenance manuals. 

    SPECIFIC OUTCOME 4 
    Complete Work Task. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Transformer auxiliaries are restored, quality checks conducted after maintenance and corrective action taken where necessary as per maintenance procedures. 

    ASSESSMENT CRITERION 2 
    Tools and equipment used for maintenance is cleaned, checked for functionality and stored on completion of task. 

    ASSESSMENT CRITERION 3 
    Work area is cleaned after completion of task in line with housekeeping standards. 

    ASSESSMENT CRITERION 4 
    Waste/hazardous materials are disposed of according to site specific/environmental standards and procedures. 

    ASSESSMENT CRITERION 5 
    Completion of work is communicated and permit cleared as per operating regulations for High Voltage systems. 

    ASSESSMENT CRITERION 6 
    Documentation is completed and submitted according to data management procedures. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any institution offering learning that will enable achievement of this unit standard must be accredited as a provider through the relevant ETQA by SAQA.
  • Moderation of assessment will be overseen by the relevant ETQA according to the moderation guidelines in the relevant qualification and the agreed ETQA procedures. 

  • UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • Terminology associated with transformers.
  • Working principles of transformers and its components/protection devices.
  • Operating principles of transformers, tap changers and voltage regulators.
  • Basic understanding of laboratory tests done on insulating media and the causes of gas/moisture build-up in it. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems (deviations from statutory requirements are identified, reported and rectified). 

    UNIT STANDARD CCFO WORKING 
    Work effectively with others (affected parties are liased with and informed). 

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage oneself (plan, select, organise work tasks). 

    UNIT STANDARD CCFO COLLECTING 
    Collect, organise and critically evaluate information (worksite preparation). 

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate (affected parties are liaised with and informed). 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    This unit standard replaces unit standard 113880, "Inspect, test and maintain Medium/High Voltage transformers", Level 4, 6 credits.

    Supplementary information:

    Specified requirements:

    Specified requirements include legal and legislative specific requirements and are contained in one or more of the following documents:
  • SANS specifications.
  • OSH Act, No 85 OF 1993.
  • Manufacturer's manuals. 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  72052   Further Education and Training Certificate: Electrical Engineering  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered" 
    2013-11-07  As per Learning Programmes recorded against this Qual 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    1. CIRCLEWAY TRAINING (PTY) LTD 
    2. College of Cape Town - Pinelands Campus 
    3. ESKOM KOEBERG - RADIATION PROTECTION 
    4. False Bay College - Westlake Campus 
    5. MOVING AHEAD DEVELOPMENT AGENCY 
    6. PHAKGAMANG MATSIANA BUSINESS ENTERPRISE 
    7. The Water Training Institute of South Africa 



    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.