SAQA 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.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Inspect, test and maintain 3-kV DC rectifiers and associated equipment in traction sub-stations 
SAQA US ID UNIT STANDARD TITLE
259194  Inspect, test and maintain 3-kV DC rectifiers and associated equipment in traction sub-stations 
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  8 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "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 does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
A learner credited with this unit standard will be able to inspect, test and maintain 3-kV DC rectifiers and associated equipment in traction sub-stations in an electrical environment as well as ensuring the continuity of power supply in the Rail Sector. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Safety procedures (electrical).
  • Basic understanding of electronics.
  • Induction to industries.
  • General fault finding principles.
  • Use of electrical test instruments.
  • Relevant worksite procedures.
  • Basic safety procedures related to tools, electricity and cleaning solvents.
  • Isolating procedures.
  • Carry out resistance tests.
  • Read and interpret drawings and diagrams.
  • HV electrical induction awareness.
  • Use and handling of cleaning solvents and materials.
  • Job card procedures.
  • Identification of hazardous material.
  • Relevant lifting equipment procedures. 
    		•

    UNIT STANDARD RANGE 
    The range of this unit standard may be limited to carrying out diagnostic testing and applying preventative maintenance and replacement repairs where necessary on:
  • 3-kV DC rectifiers and associated equipment in traction sub-stations.
  • Applies to a voltage of 3000 volts DC.
  • Relevant drawings, symbols and diagrams.
  • A person to enter a electrical restricted access ways must be authorised.
  • Electrical restricted access ways refer to an access way to which entry is prevented by a barrier, which may only be opened or removed by an authorised person. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Communicate clearly and concisely without misunderstanding with relevant role players and complete relevant documentation. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Relevant documentation is correctly completed. 
    ASSESSMENT CRITERION RANGE 
    Documentation can include but is not limited to, company specific documentation, time sheets, work permits, etc.
     

    ASSESSMENT CRITERION 2 
    Communications related to inspect, test and maintain 3-kV DC rectifiers and associated equipment in traction sub-stations are carried out effectively. (Electrical control). 
    ASSESSMENT CRITERION RANGE 
    Communications related to inspect, test and maintain 3-kV DC rectifiers and associated equipment in traction sub-stations can include but is not limited, 2-way radios, cellular phones, trunk radios, hand-held emergency telephones, etc.
     

    SPECIFIC OUTCOME 2 
    Plan and prepare for inspection, testing and maintenance on 3-kV DC rectifiers and associated equipment in traction sub-stations. 
    OUTCOME RANGE 
    Reliable centred maintenance planning periods/schedules, tools, equipment, spares, cleaning material, drawings and documents. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Inspection, testing and maintenance on 3-kV DC rectifiers and associated equipment in traction sub-stations are correctly planned and prepared. 
    ASSESSMENT CRITERION RANGE 
    Planning and preparation of inspection, testing and maintenance on 3-kV DC rectifiers and associated equipment in traction sub-stations can include but is not limited to outage schedules, manufacturer's specifications and requirements, other disciplines, control centres, associated equipment, operating history reports, failure rate, maintenance programs, plant availability, and customer requirements, etc.
     

    ASSESSMENT CRITERION 2 
    The scope of work and equipment to be maintained is identified according to the job requirement. 
    ASSESSMENT CRITERION RANGE 
    The scope of work and equipment to be maintained can include but is not limited to associated `check and/or inspection lists`, procedures and job required diagnostic tests and maintenance for 3-kV DC rectifiers and associated equipment in traction sub-stations, etc.
     

    ASSESSMENT CRITERION 3 
    Equipment, tools, spares, materials are identified and sourced for the required work according to the job requirements. 
    ASSESSMENT CRITERION RANGE 
    Equipment, tools, spares, materials can include but is not limited to general tools, spares, materials, `inspection sheets`, procedure sheets, etc.
     

    ASSESSMENT CRITERION 4 
    Equipment test instruments and specialised tools needed for inspection, testing and maintenance are identified and sourced, as per manufacturers manual, work site procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    Equipment test instruments and specialised tools needed for maintenance can include but is not limited to various test instruments, test equipment, and manufacturer's special tools, etc.
     

    ASSESSMENT CRITERION 5 
    The inspection, diagnostic testing and maintenance requirements are interpreted, and analysed for determining the performance and quality standards required. 
    ASSESSMENT CRITERION RANGE 
    The inspection, diagnostic testing and maintenance requirements can include but is not limited to manufacturer's guidelines, industry maintenance standards, worksite procedures, guidelines, standards, etc.
     

    ASSESSMENT CRITERION 6 
    3-kV DC rectifiers and associated equipment in traction sub-stations identified and manufacturer's manual and company specific guidelines and standards obtained to check scope of work and requirements. 
    ASSESSMENT CRITERION RANGE 
    3-kV DC rectifiers and associated equipment in traction sub-stations manuals can include but is not limited to manufacturer`s specification and guidelines, industry maintenance standards, worksite procedures, guidelines, standards, etc.
     

    SPECIFIC OUTCOME 3 
    Prepare the 3-kV DC rectifiers and associated equipment in traction sub-stations for inspection, tests and maintenance. 
    OUTCOME RANGE 
    Electrical Safety Instructions (ESI) and Engineering Instructions (EI): Barricading, protective clothing, stored energy, environment. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The 3-kV DC rectifiers and associated equipment in traction sub-stations is prepared in accordance with the OHSA, Electrical Safety Instructions (ESI) and Engineering Instructions (EI), and as per job card standards, worksite procedures and Reliability Centered Maintenance (RCM). 
    ASSESSMENT CRITERION RANGE 
    The preparation for safe inspection, testing and maintenance on 3-kV DC rectifiers and associated equipment in traction sub-stations can include but is not limited to Electrical Safety Instructions (ESI), Engineering Instructions (EI) barricading, protective clothing, stored energy, worksite procedures, job card procedure, Reliability Centered Maintenance (RCM), etc.
     

    ASSESSMENT CRITERION 2 
    The work party is fully briefed on the equipment to be worked on in terms of safety regulations. 
    ASSESSMENT CRITERION RANGE 
    The equipment to work in terms of safety regulations can include but is not limited to safe working zones, safety features in place, company specific documentation, approved documentations, etc.
     

    ASSESSMENT CRITERION 3 
    The environment and personnel are protected according to safety measures, which are available as per worksite safety requirements. 
    ASSESSMENT CRITERION RANGE 
    The safety measures which are available as per work site safety requirements can include but is not limited to cleaning solvent spillage, protective clothing, safe work clearances, an identified and marked safe work area, etc.
     

    ASSESSMENT CRITERION 4 
    Obstacles and safety hazards are identified and necessary precautions are taken in accordance with OHSA, Electrical Safety Instructions (ESI), Engineering Instructions (EI), to ensure work area is/and remains safe for workers. 
    ASSESSMENT CRITERION RANGE 
    The obstacles and safety hazards can include but is not limited to minimum safe working clearances to other energized, apparatus or equipment, safe discharges of stored electrical potential (e.g. capacitors), etc.
     

    ASSESSMENT CRITERION 5 
    The correct equipment, tools, spares, materials are identified, obtained and verified according to the job requirements. 
    ASSESSMENT CRITERION RANGE 
    The correct equipment, tools, spares and materials can include but is not limited to general tools, spares, materials, `inspection sheets`, procedure sheets, etc.
     

    ASSESSMENT CRITERION 6 
    Equipment, test instruments, and special tools needed for maintenance is identified, obtained and verified for functionality and safety prior to maintenance task being carried out. 
    ASSESSMENT CRITERION RANGE 
    The correct test instruments, specialised tools needed for maintenance can include but is not limited to test equipment, manufacturer's special tools, etc.
     

    ASSESSMENT CRITERION 7 
    Cleaning materials and solvents are obtained and prepared for use as per manufacturer specifications, work site procedure, safety standards, hazardous chemicals procedures and material safety handling procedure data sheets. 
    ASSESSMENT CRITERION RANGE 
    Cleaning materials and solvents can include but is not limited to electrical cleaning solvents, electrical contact greases, rags, sand paper, waste material, paint, brushes, etc.
     

    SPECIFIC OUTCOME 4 
    Carry out inspection on 3-kV DC rectifiers and associated equipment in traction sub-stations. 
    OUTCOME RANGE 
    History operation reports, visuals, on site tests. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The 3-kV DC rectifiers and associated equipment in traction sub-stations history and operational/maintenance records are scrutinised indicating service needs noted for attention during the routine servicing as per maintenance procedure. 
    ASSESSMENT CRITERION RANGE 
    The 3-kV DC rectifiers and associated equipment in traction sub-stations defect history and operational/maintenance records can include but is not limited to fault operations, malfunction, reported problems, mechanical failures, environmental damage (including weather), etc.
     

    ASSESSMENT CRITERION 2 
    The inspections on 3-kV DC rectifiers and associated equipment in traction sub-stations are carried out safely and correctly according to the maintenance check sheets, any damage or defects are identified as per manufacturer's specification, worksite operational standards and settings and company specific specifications. 
    ASSESSMENT CRITERION RANGE 
    Inspections to identify any damage or defects on 3-kV DC rectifiers and associated equipment in traction sub-stations in traction sub-stations can include but is not limited to damaged porcelain insulators, corrosion, wear and tear, stress cracks, contact pitting, alignment, loose connections, leaking and bulging, discharge resistance continuity, etc.
     

    ASSESSMENT CRITERION 3 
    The diagnostic tests are correctly carried out as per manufacture requirements/engineering instructions and the results analysed for interpreting the maintenance required. 
    ASSESSMENT CRITERION RANGE 
    The diagnostic can include but is not limited to tests insulation tests, contact resistance, alarm settings, status indications to control panel, contact pressure, etc.
     

    ASSESSMENT CRITERION 4 
    Personal protective equipment is used and site-specific procedures are adhered to throughout the inspection, testing and maintenance process. 
    ASSESSMENT CRITERION RANGE 
    Personal protective equipment can include but is not limited to safety overalls, gloves, safety boots, dust mask, etc.
     

    ASSESSMENT CRITERION 5 
    The results of the diagnostic tests are correctly recorded to meet the job requirements. 
    ASSESSMENT CRITERION RANGE 
    Recording of the diagnostic tests can include but is not limited to completing work site checklists, electronic data records, job reports, etc.
     

    SPECIFIC OUTCOME 5 
    Carry out maintenance on 3-kV DC rectifiers and associated equipment in traction sub-stations. 
    OUTCOME RANGE 
    Reliable centred maintenance frequencies or manufacturers maintenance schedules or other preventative maintenance frequencies. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Maintaining of 3-kV DC rectifiers and associated equipment in traction sub-stations consistent with manufacturer's specifications, Reliability Centered Maintenance (RCM) and job requirements. This may include the disassembling or opening of parts of the equipment. 
    ASSESSMENT CRITERION RANGE 
    Maintaining of 3-kV DC rectifiers and associated equipment in traction sub-stations can include but is not limited to, rectifiers, reactors, wave filters, control circuits, fans, etc.
     

    ASSESSMENT CRITERION 2 
    All cleaning solvents and materials are used safely and appropriately with the correct personal safety aspects taken into consideration, during maintenance as per manufacturer's specifications, Reliability Centered Maintenance (RCM) and worksite standards. 
    ASSESSMENT CRITERION RANGE 
    The safe used of solvents and materials can include but is not limited to manufacturer's specifications, worksite standards, environmental specifications, Reliability Centered Maintenance (RCM), etc.
     

    ASSESSMENT CRITERION 3 
    All tools and equipment are used safely and correctly during maintenance as per manufacturers' specifications and worksite standards. 
    ASSESSMENT CRITERION RANGE 
    Tools and equipment can include but is not limited to general engineering tools, specialised tools, torque wrench, etc.
     

    ASSESSMENT CRITERION 4 
    Ensure that all environmental aspects are taken into consideration as per environmental impact studies/management. 
    ASSESSMENT CRITERION RANGE 
    No defective spares and fastening devices thrown around, cleaning solvent spillage is kept to a minimum, no old or conductive paste spilled on ground.
     

    ASSESSMENT CRITERION 5 
    Faultfinding is carried out as per the manufacturers' manuals and maintenance procedures. 

    SPECIFIC OUTCOME 6 
    Perform function tests and post-maintenance checks on 3-kV DC rectifiers and associated equipment in traction sub-stations. 
    OUTCOME RANGE 
    Operational tests, check sheets. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Work party is advised of safe work practices when tests and checks are about to start on 3-kV DC rectifiers and associated equipment as per OHSA, Electrical Safety Instructions (ESI), Engineering Instructions (EI) and reliability centered maintenance (RCM). 
    ASSESSMENT CRITERION RANGE 
    Safe work practices when tests and checks are about to start on 3-kV DC rectifiers and associated equipment can include but are not limited to OHSA, Electrical Safety Instructions (ESI), Engineering Instructions (EI) and Reliability Centered Maintenance schedules (RCM), etc.
     

    ASSESSMENT CRITERION 2 
    All the function tests required are completed to manufacturer's standards and worksite standards. 
    ASSESSMENT CRITERION RANGE 
    Function tests can include but are not limited to test operates attenuation circuit, measure the resistance of the wave filter discharge resistance, diode test, alarms, etc.
     

    ASSESSMENT CRITERION 3 
    All equipment worked on is inspected and set for return to service as per maintenance procedures and as per Reliability Centered Maintenance (RCM), maintenance schedules. 
    ASSESSMENT CRITERION RANGE 
    3-kV DC rectifiers and associated equipment worked on and set for return to service can include but are not limited to rectifiers, wave filter, reactor, etc.
     

    SPECIFIC OUTCOME 7 
    Complete all tasks on 3-kV DC rectifiers and associated equipment in traction sub-stations. 
    OUTCOME RANGE 
    Maintenance documentation, inspection sheets, test sheets. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The `as found` and `as left` conditions are recorded analysis and reporting of defects, correct completion of the plant and defect history, including replacement spares fitted. 
    ASSESSMENT CRITERION RANGE 
    The `as found` and `as left` conditions are recorded can include but are not limited to the plant history as per maintenance policy, quality standards, logbooks, job cards, etc.
     

    ASSESSMENT CRITERION 2 
    Post maintenance clean up process is completed according to industry standards, environmental requirements and site-specific standards. 
    ASSESSMENT CRITERION RANGE 
    Post maintenance clean up process can include but are not limited to tools, equipment, lubricants, solvents, etc.
     

    ASSESSMENT CRITERION 3 
    Waste material is disposed of according to site-specific standards and environmental policies and requirements. 
    ASSESSMENT CRITERION RANGE 
    Waste material can include but are not limited to solvents, waste, rags, scrap/defective parts, etc.
     

    ASSESSMENT CRITERION 4 
    All tools and equipment is checked, cleaned and return for safe keeping according to work site house keeping procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    All tools and equipment can include but are not limited to general hand tools, specialised tools, testing equipment, maintenance equipment.
     

    ASSESSMENT CRITERION 5 
    Other necessary documentation is completed and submitted to designated personnel, as well as all manuals and guidelines are returned for safe keeping as per work site procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    The safe keeping of manuals and completion of other necessary documentation can include but are not limited to designated personnel, worksite procedures, company specific instructions, standards, etc.
     


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • An individual wishing to be assessed against this unit standard may apply at an assessment agency, assessor or provider institution that has been accredited by the relevant ETQA.
  • 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 registered and accredited as a provider with the relevant ETQA as prescribed.
  • Moderation of assessment will be done by the relevant ETQA as prescribed.
  • Anyone assessing a learner against this unit standard must be trained, qualified, certified and re-certified as an assessor in the OHTE/Substation division in accordance with the specific validation regulations relevant to the specific unit standard and registered with the relevant ETQA. 
    		•

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • A broad understanding and knowledge of the utilisation of hand tools, measuring tools, specialised tools and testing equipment.
  • A broad understanding and knowledge of the Reliability Centered Maintenance (RCM).
  • A basic understanding and knowledge of related legislation (OHSA).
  • A comprehensive understanding and knowledge of Electrical Safety Instructions (ESI) and Engineering Instructions (EI).
  • A broad understanding and knowledge of safety related standards and procedures (e.g. PPE).
  • A basic understanding and knowledge of environmental awareness.
  • A comprehensive understanding and knowledge of basic electrical drawings, diagrams and manufacturers instructions.
  • A comprehensive understanding and knowledge of the different types of 3-kV DC rectifiers and associated equipment and their components as well as the functions of such components.
  • A comprehensive understanding and knowledge of the inspection, testing and maintaining procedures and instructions with regard to high voltage switchgear on distribution network(s). 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    Learner and societal development:

    Learners can understand the importance of:
  • Safety in the workplace as well as in the whole environment.
  • Being a team player in the work environment and in society.
  • Communicating effectively in the work environment and in society.
  • Their responsibility for the safety and well being of fellow workers and society at large.
  • Being environmental sensitive. 
    		•

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO ORGANISING 
    Organise oneself and one's activities responsibly and effectively in the ability to follow instructions, regulations when working alone or in a work team, whilst ensuring the safe execution of work activities. 

    UNIT STANDARD CCFO COLLECTING 
    Collect, evaluate, organise and critically evaluate information related to inspection, testing and maintenance of 3-kV DC rectifiers and associated equipment. 

    UNIT STANDARD CCFO COMMUNICATING 
    Learners can communicate effectively with relevant role-players when receiving or giving instructions to fellow workers, and in the recording and reporting of information. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically, showing responsibility towards the environmental and the health of others during inspection, testing and maintenance of high voltage switchgear on distribution network(s) to ensuring that all safety and environmental conditions are considered. 

    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 
    Supplementary Information:
  • This unit standard can be assessed in a workplace environment, or in a training or educational environment if simulated equipment response and examples can be provided, or in a combination of both environments.
  • Performance in relation to the elements must comply with current legislation, especially the OSH Act and their subsequent amendments, electricity supply industry codes of practice and documented procedures as well as Electrical Safety Instructions (ESI) and Engineering Instructions (EI). A full list of current legislation and industry codes is available from the SETA.
  • Reference to terms, procedures, and specifications in this unit standard may be taken as including documented procedures and specifications relevant to the workplace in which assessment is carried out.
  • Performance in relation to the elements must comply with Industry operating regulations for high voltage systems (Electrical Safety Instructions (ESI) and Engineering Instructions (EI)).
  • All work practices shall meet documented industry maintenance standards, including the quality management requirements, and the documentation of activities, events, and decisions.
  • The range of this unit standard is limited to carrying out diagnostic testing and applying preventative maintenance and replacement repairs where necessary on 3-kV DC rectifiers and associated equipment.

    Note:

    Legal Requirements:
  • OHS Act and its extensions.
  • Electrical Safety Instructions (ESI).
  • Engineering Instructions (EI).

    Terminology of:
  • 3-kV DC rectifiers and associated equipment: Means a device provided for the purpose of supplying 3-kV DC overhead track equipment from the source of electrical energy.

    The following terms and abbreviations relate to this unit standard:
  • OHSA: Occupational Health and Safety Act.
  • HV: High voltage.
  • KV: Kilo volts.
  • DC: Direct current.

    Context Specific:

    Specific to a discipline or an industry:
  • Manufacturer's specifications.
  • Worksite policies and procedures.
  • Company specific instructions.

    Assessment Methods:
  • Written tests.
  • Oral/on-the-job.
  • In situ (on-the-job) observation.

    These methods must be selected carefully, based on the purpose of the assessment (For example, the written method could be used to assess knowledge, or on-the-job demonstration for practical competence). The assessment must integrate a number of different methods (no less than two of those detailed above) in order to give the assessor reliable and valid proof of competence and evidence of required attitudes.

    Values:
  • Trustworthiness.
  • Safety consciousness.
  • Accurateness.
  • Responsibility.
  • Neatness.
  • Willingness to learn.
  • Pro-activeness.
  • Quality consciousness.
  • Time consciousness.
  • Flexibility.
  • Sobriety. 
    		•

    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"     		 2023-06-30  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. ESKOM GENERATION - PALMIET PUMP STORAGE GRABOUW 
    2. KP ACADEMY (PTY) LTD 
    3. POWER SYSTEMS TRAINING, CAPE TOWN 


    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.