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 high voltage isolators 
SAQA US ID UNIT STANDARD TITLE
13681  Inspect, test and maintain high voltage isolators 
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  12 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2007-04-03  2009-02-18  SAQA 0160/05 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2010-02-18   2013-02-18  

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 is replaced by: 
US ID Unit Standard Title Pre-2009 NQF Level NQF Level Credits Replacement Status
259202  Inspect, test and maintain high voltage isolators  Level 4  NQF Level 04  12   

PURPOSE OF THE UNIT STANDARD 
This unit standard is for persons in the Generation; Distribution; Transmission Sector.

The person credited with this unit standard is capable of:
  • Inspecting, testing and maintaining high voltage isolators according to statutory requirements; work site procedures and standards to disconnect or connect the flow of electricity within a circuit.

    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 
  • Safety procedures (electrical)
  • Induction to industries
  • General fault finding principles
  • Electrical test instruments
  • Relevant worksite procedures
  • Basic safety procedures related to tools, electricity and cleaning solvents
  • Isolating procedures
  • Dismantling and installation procedures
  • Names and functions of Isolators and their components
  • Carry out inductive (resistance) tests
  • Read and interpret drawings and diagrams
  • HV electrical induction awareness
  • Use and handling of cleaning solvents and materials 
    		•

    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:
  • High voltage isolators such as: BBT / ABB type TFZ / TFY / TFX; Happlin Pantagraphs type SNS; ASEA type NSAP / B; CULLINAN / ALSTROM type DSB
  • Applies to a voltage above 33KV (33000v)
  • Mechanisms being: Motor operated or manually operated
  • Rating being: -kA
  • Relevant drawings

    Note:
    This unit standard does not cover major overhauls of Isolators and their structures. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Plan and prepare for inspection, testing and maintenance on high voltage isolators 
    OUTCOME RANGE 
    Reliable centred maintenance planning periods/schedules, tools, equipment, spares, cleaning material, drawings and documents. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Planning is arranged, integrated and aligned in terms of resource optimisation as per work sit procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    Outage schedules, manufacturer's specifications and requirements, other disciplines, control centres, associated equipment, operating history reports, failure rate, maintenance programs, plant availability, customer requirements.
     

    ASSESSMENT CRITERION 2 
    2. The scope of work and equipment to be maintained is identified according to the job requirement. 
    ASSESSMENT CRITERION RANGE 
    Associated 'check and/or inspection lists', procedures and job required diagnostic tests and maintenance for Isolator arms, mechanisms motor or manual.
     

    ASSESSMENT CRITERION 3 
    3. Equipment, tools, spares, materials and personnel resources are sourced for the required work according to the job requirements. 
    ASSESSMENT CRITERION RANGE 
    People, general tools, spares, materials, 'inspection sheets', procedure sheets, scaffolding and ladders.
     

    ASSESSMENT CRITERION 4 
    4. Equipment test instruments and specialised tools needed for maintenance are identified and sourced, as per manufacturers manual, work site procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    Test equipment, torque wrench, circlip pliers, grease gun, and manufacturers specialised tools.
     

    ASSESSMENT CRITERION 5 
    5. The inspection, diagnostic testing and maintenance requirements are interpreted, and analysed for determining the performance and quality standards required. 
    ASSESSMENT CRITERION RANGE 
    Manufacturer's guidelines, industry maintenance standards or work site procedures, guidelines and standards.
     

    ASSESSMENT CRITERION 6 
    6. The high voltage isolator is identified and manufacturers manual obtained to check scope of work and requirements. 
    ASSESSMENT CRITERION RANGE 
    Manufacturer's guidelines, Industry maintenance standards or work site procedures, guidelines and standards.
     

    SPECIFIC OUTCOME 2 
    Prepare the isolator for inspection, tests and maintenance 
    OUTCOME RANGE 
    ORHVS - barricading, work permit systems; protective clothing; stored energy; environment. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The high voltage Isolator is prepared in accordance with the OHSA & ORHVS, thus required work permit is received, checked, and signed as per job requirements standards. 
    ASSESSMENT CRITERION RANGE 
    Careful check of the isolations, earthing and safety barricades to ensure the work permit provides a safe work environment.
     

    ASSESSMENT CRITERION 2 
    2. The work party is fully briefed on the equipment to be worked on in terms of safety regulations. 
    ASSESSMENT CRITERION RANGE 
    Work to be done, safe working zone and safety features in place, signed worker's register or its approved equivalent. All communication with the work party is clear and unambiguous.
     

    ASSESSMENT CRITERION 3 
    3. Safety measures are available and prepared to protect the environment and personnel as per work site safety requirements. 
    ASSESSMENT CRITERION RANGE 
    Cleaning solvent spillage, protective clothing, greases and lubricating oils, safe work clearances, safe work area has been identified and marked.
     

    ASSESSMENT CRITERION 4 
    4. Additional isolation from other energy sources on the Isolator is done as per maintenance standard requirements. 
    ASSESSMENT CRITERION RANGE 
    380 V supply to motor.
     

    ASSESSMENT CRITERION 5 
    5. Obstacles and safety hazards are identified and necessary precautions are taken in accordance with OHSA, ORHVS, local authority; & electrical regulations to ensure work area is/and remains safe for workers. 
    ASSESSMENT CRITERION RANGE 
    Minimum safe working clearances to other energised apparatus or equipment; safe discharges of stored electrical potential (e.g. capacitors).
     

    ASSESSMENT CRITERION 6 
    6. Equipment, tools, spares, materials and personnel resources are obtained and ready for use for the required work according to the job requirements. 
    ASSESSMENT CRITERION RANGE 
    People, general tools, spares, grease gun, materials, 'inspection sheets', procedure sheets, scaffolding and ladders.
     

    ASSESSMENT CRITERION 7 
    7. Equipment test instruments and specialised tools needed for maintenance is selected, inspected and checked for functionality and safety prior to maintenance task being carried out. 
    ASSESSMENT CRITERION RANGE 
    Test equipment, torque wrench, circlip pliers, grease gun, and manufacturers specialised tools.
     

    ASSESSMENT CRITERION 8 
    8. Cleaning materials and solvents are obtained and prepared for use as per manufacturer specifications, work site procedure and safety standards. 
    ASSESSMENT CRITERION RANGE 
    Electrical cleaning solvents, lubrication greases, penetrating oils, electrical contact greases, rags, sand paper, waste material, paint, brushes.
     

    SPECIFIC OUTCOME 3 
    Carry out inspection and tests on switch gear 
    OUTCOME RANGE 
    History operation reports, visuals, on site tests. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. The Isolated defect history and operational/maintenance records are scrutinised indicating service needs noted for attention during the routine servicing as per maintenance procedure. 
    ASSESSMENT CRITERION RANGE 
    Fault operations, malfunction, reported problems, infra red inspection results, mechanism failure, excessive arcing damage, weather damage.
     

    ASSESSMENT CRITERION 2 
    2. The inspections carried out according to the maintenance check sheets, identify any damage or defects as per manufacturers specification work site operational standards and settings. 
    ASSESSMENT CRITERION RANGE 
    Damaged porcelain insulators, corrosion, ware and tare, stress cracks, lack of lubrication, UV damage and weather seals, contact pitting, alignment.
     

    ASSESSMENT CRITERION 3 
    3. The diagnostic tests are carried out as per manufacture requirements and the results analysed for interpreting the maintenance required. 
    ASSESSMENT CRITERION RANGE 
    Meggar tests, time travel tests, contact resistance, auxiliary contact tests, motor run time. Motor operations and gearing, alarm settings, status indications to control panel, and contact penetration.
     

    ASSESSMENT CRITERION 4 
    4. Personal protective equipment is used and site specific procedures are adhered to throughout the inspection, testing and maintenance process. 
    ASSESSMENT CRITERION RANGE 
    Safety overalls, gloves, goggles, hard hats, safety boots, safety belts/harnesses.
     

    ASSESSMENT CRITERION 5 
    5. The results of the diagnostic tests are recorded to meet the job requirements. 
    ASSESSMENT CRITERION RANGE 
    Completing work site check lists, electronic data records, job reports.
     

    SPECIFIC OUTCOME 4 
    Carry out maintenance on switch gear 
    OUTCOME RANGE 
    Reliable centred maintenance periods or manufacturers maintenance schedules or other preventative maintenance periods. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Safety devices or work platforms are inspected, erected and used correctly and safely during maintenance and repairs as per safety standards and work site procedures. 
    ASSESSMENT CRITERION RANGE 
    Scaffolding, mobile platforms, A-frame ladders.
     

    ASSESSMENT CRITERION 2 
    2. Disassembling of parts of isolator are carried out for further inspection and testing, consistent with manufacturer's specifications and job requirements. 
    ASSESSMENT CRITERION RANGE 
    Conductor connections, contact covers, mechanism box covers.
     

    ASSESSMENT CRITERION 3 
    3. The minor invasive servicing is carried out following manufacturer's procedures and worksite instructions. This may include the disassemble or opening of parts of the equipment. 
    ASSESSMENT CRITERION RANGE 
    Solvent cleaning, visual inspection of components, lubricating oil replacement, greasing, penetrating oils, contact greasing, cleaning of auxiliary contacts, replacement of defective seals, packing, lubricating valves, operation adjustments, cleaning, lubricating, control and mechanism serviced.
     

    ASSESSMENT CRITERION 4 
    4. All cleaning solvents and materials are used appropriately and safely with the correct personal safety aspects taken into consideration, during inspection, tests and maintenance as per manufacturers specifications and work site standards. 

    ASSESSMENT CRITERION 5 
    5. The major servicing/maintenance is carried out following manufacturer's procedures and work site instructions and standards. This will include the opening and disassemble of contact housing and operational gear. 
    ASSESSMENT CRITERION RANGE 
    Removing of oxidisation, stripping of all moving parts, 'repairs to' or 'replacement of' worn parts, replacement at contact fingers, replacement of defective seals, total adjustment of alignment, adjustments, contact tip penetration, replacement of defective mechanism components.
     

    ASSESSMENT CRITERION 6 
    6. All tools are used appropriately and safely during inspection, tests and maintenance as per manufacturers specifications and work site standards. 
    ASSESSMENT CRITERION RANGE 
    General engineering tools, specialised tools and equipment.
     

    ASSESSMENT CRITERION 7 
    7. The re-assembly of the Isolator parts and components are carried out in the approved manner provided in the manufacturer's manual. 
    ASSESSMENT CRITERION RANGE 
    All components being assembled in the correct order, with proper fit and secured in the specified way, correct greases used where applicable, seals are correctly placed.
     

    ASSESSMENT CRITERION 8 
    8. 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 excessive grease spilled on ground.
     

    ASSESSMENT CRITERION 9 
    9. Safety procedures are adhered to during the whole process, as per safety standards and work site procedures. 
    ASSESSMENT CRITERION RANGE 
    Safe use of: test equipment/tools/ladders/scaffolding/platforms, safety gear and discharge earthing.
     

    SPECIFIC OUTCOME 5 
    Perform function tests and post-maintenance checks 
    OUTCOME RANGE 
    Operational tests, visual inspections, check sheets. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. Work party is advised of Isolator tests and checks about to start as per OHSA, ORHVS and safe work practices. 
    ASSESSMENT CRITERION RANGE 
    People and tools are all clear of Isolator poles, earthing removed for tests, barriers and mechanisms placed, all communication with the work party is clear and unambiguous.
     

    ASSESSMENT CRITERION 2 
    2. All services and necessary control features are reinstated and approval obtained for function tests according to maintenance procedures. 
    ASSESSMENT CRITERION RANGE 
    Control circuits, mechanism, power, indication.
     

    ASSESSMENT CRITERION 3 
    3. All the function tests required are completed without malfunction and to work site standard. 
    ASSESSMENT CRITERION RANGE 
    Insulation resistance tests, time travel tests, contact resistance, minimum operating voltage, trip tests, auxiliary contact tests, insulation tests, motor functional tests and run time, protection indicators and alarms.
     

    ASSESSMENT CRITERION 4 
    4. All the remote operation tests required are completed without malfunction and to work site standard. 
    ASSESSMENT CRITERION RANGE 
    Initiating signals from control panel or computer, fault alarms and indicators.
     

    ASSESSMENT CRITERION 5 
    5. All equipment worked on is inspected and set for return to service as per maintenance procedures. 
    ASSESSMENT CRITERION RANGE 
    Confirming all equipment and the work party are clear, all operational equipment that has been worked on is now set ready for service.
     

    ASSESSMENT CRITERION 6 
    6. All alarms and relays are reset as per work site procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    Auxiliary control circuit alarms and relays.
     

    SPECIFIC OUTCOME 6 
    Complete all tasks on isolators 
    OUTCOME RANGE 
    Maintenance documentation, inspection sheets, test sheets. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    1. All the maintenance tools and facilities are removed and the isolator and is left in the 'ready-for-service' condition as per maintenance standards and procedures. 
    ASSESSMENT CRITERION RANGE 
    Checking all tools removed, all connections tight, all panels returned, all moving parts set to 'in-service' position, maintenance switch in correct position, protection relays reset.
     

    ASSESSMENT CRITERION 2 
    2. The 'as found' and 'as left' conditions are recorded in the plant history as per maintenance policy and quality standards. 
    ASSESSMENT CRITERION RANGE 
    Analysis and reporting of defects, correct completion of the plant and defect history, including replacement spares fitted.
     

    ASSESSMENT CRITERION 3 
    3. The equipment condition status is recorded according to site-specific standards. 
    ASSESSMENT CRITERION RANGE 
    Operation counter noted, number of trial operations noted, auxiliary contacts quality checks.
     

    ASSESSMENT CRITERION 4 
    4. The routine and inspection service records are completed and submitted to meet the work site requirements. 
    ASSESSMENT CRITERION RANGE 
    Written records and/or electronic data reporting, test reports, inspection reports.
     

    ASSESSMENT CRITERION 5 
    5. Post maintenance clean up process is completed according to industry standards, environmental requirements and site specific standards. 
    ASSESSMENT CRITERION RANGE 
    Tools, equipment, oils, gasses, greases, lubricants and solvents.
     

    ASSESSMENT CRITERION 6 
    6. Clearance of the work permit is confirmed as per ORHVS. 
    ASSESSMENT CRITERION RANGE 
    Confirming all members of the work party have signed clearance certificate/workman's registers, responsible person cleared the work permit and the equipment is returned to service without incident.
     

    ASSESSMENT CRITERION 7 
    7. Waste material is disposed of according to site specific standards and environmental policies and requirements. 
    ASSESSMENT CRITERION RANGE 
    Solvents, waste, rags, scrap/defective parts.
     

    ASSESSMENT CRITERION 8 
    8. All tools and equipment is checked, cleaned and return for safe keeping according to work site house keeping procedures and standards. 
    ASSESSMENT CRITERION RANGE 
    General hand tools, specialised tools, testing equipment, maintenance equipment's.
     

    ASSESSMENT CRITERION 9 
    9. 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. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
    Accreditation and moderation options:
  • Anyone assessing a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any provider offering learning that will enable achievement of this unit standard must be accredited as a provider through the relevant ETQA.
  • 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 
  • A basic understanding and skills in the utilisation of hand tools/lifting equipment & measuring tools and specialised tools
  • A basic understanding and knowledge of: legislation and applicable regulations
  • A basic knowledge of: safety related standards and procedures
  • A basic knowledge of: environmental awareness
  • Able to read and interpret basic drawings, diagrams and manufacturers instructions
  • A knowledge of: types of isolators and there components as well as the functions of such components 
    		•

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    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 when working by ones self or in a work team, ensure safe execution of work activities). 

    UNIT STANDARD CCFO COLLECTING 
    Collect, evaluate, organise and critically evaluate information related to (inspection, testing and maintenance of high voltage Isolators). 

    UNIT STANDARD CCFO COMMUNICATING 
    Effective use of communication methods when (giving instructions to fellow workers, recording and reporting information). 

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

    UNIT STANDARD CCFO CONTRIBUTING 
    Tasks using responsible thinking and decision making (in relation to the use and choice of relevant personal protecting equipment and safety equipment). 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    UNIT STANDARD NOTES 
    This unit standard has been replaced by unit standard 259202, which is "Inspect, test and maintain high voltage isolators", Level 4, 12 credits.

    This Unit Standard was originally registered on 14 August 2002 under SAQA decision number 0743/02. It has been re-registered on 11 February 2004 under SAQA 2552/04.


    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 are able to 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. 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 (ORHVS).
  • 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 high voltage oil circuit breakers, high voltage SF6 live tank and dead tank outdoor circuit breakers, high voltage GIS circuit breakers, ABCB and VCB, and is normally done at electricity supply substations.

    Nnote:
    This unit standard does not cover major overhauls of SF6 circuit breakers and GIS.

    Specified requirements:

    Legal requirements:
  • SABS
  • OHS Act and its extensions
  • Local Authority

    A glossary of terms about the terminology of:

    Isolator
    = means a device provided for the purpose of isolating apparatus from the source of electrical energy.

    The following terms and abbreviations relate to this unit standard:

    ORHVS
    = Operating Regulations for High Voltage Systems (extensions to OHSA)

    OHSA
    = Occupational Health and Safety Act

    HV
    = high voltage

    IEC
    = International Electromechanical Commission

    Context specific:

    Specific to a discipline or a industry
  • Manufacturers specifications
  • Work site policies and procedures 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Elective  48474   National Certificate: Electrical Engineering  Level 4  Level TBA: Pre-2009 was L4  Passed the End Date -
    Status was "Reregistered"     		 2009-02-18  Was EWSETA until Last Date for Achievement 


    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.
     
    NONE 


    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.