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: 

Know and understand power dispatch on an electrical interconnected system 
SAQA US ID UNIT STANDARD TITLE
242757  Know and understand power dispatch on an electrical interconnected system 
ORIGINATOR
SGB Power Plant Operations 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Engineering and Related Design 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 5  Level TBA: Pre-2009 was L5  4 
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 person credited with this unit standard will be able to know the factors that must be taken into consideration when dispatching power is generated. 

LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
It is assumed that learners are already competent in:
  • Communication and Mathematical Literacy at NQF Level 4.
  • Electrical and mechanical understanding at NQF Level 4. 
    		•

    UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Describe scheduling of power generation. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Functions of generation dispatch are described within local environment. 
    ASSESSMENT CRITERION RANGE 
    Sufficient generating capacity online at all times to meet the load demand, plus system losses, plus reserve capacity for emergencies.
     

    ASSESSMENT CRITERION 2 
    Make up of the power system is explained within local environment. 
    ASSESSMENT CRITERION RANGE 
    Power pools and interconnected control areas.
     

    ASSESSMENT CRITERION 3 
    Major elements and their effects in a control area are described within local environment. 

    ASSESSMENT CRITERION 4 
    Preparation of the daily generation schedule based on the load forecast is explained according to demand requirements. 
    ASSESSMENT CRITERION RANGE 
    Spinning reserve requirements, short term and long term stand?by reserve capacity, short term and long term availability of generation units, alternate sources of generation available to the control area, the availability of power for purchase from independent power producers or neighbouring utilities.
     

    ASSESSMENT CRITERION 5 
    Factors affecting the order of dispatching generators are described according to specified requirements. 
    ASSESSMENT CRITERION RANGE 
    Cost, location and prime mover characteristics.
     

    SPECIFIC OUTCOME 2 
    Explain the order of power dispatch. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Characteristics of generating units are described according to design specifications. 
    ASSESSMENT CRITERION RANGE 
    Base load units, variable load machines, peaking units and regulating units.
     

    ASSESSMENT CRITERION 2 
    Typical limitations when bringing generators on-line are observed according to design specifications. 

    ASSESSMENT CRITERION 3 
    Economic dispatch based upon comparison of generation costs from different units is described as within local environment. 

    ASSESSMENT CRITERION 4 
    Components of generation cost are explained according to specified requirements. 
    ASSESSMENT CRITERION RANGE 
    Start-up, shutdown, no-load running cost, and incremental cost with load.
     

    ASSESSMENT CRITERION 5 
    The dispatch calculation program is applied within a local environment. 

    ASSESSMENT CRITERION 6 
    Marginal costing concepts are applied within local environment. 
    ASSESSMENT CRITERION RANGE 
    Marginal cost at different times of the day, the dispatch of hydro power based on marginal costing, i.e. displacement of high priced thermal power, hydro dispatch based upon control of water releases, dispatch of pumped storage power, economy interchange between neighbouring utilities, spot price for economy power, inadvertent interchange and arrangements for compensating power flow.
     

    SPECIFIC OUTCOME 3 
    Explain transmission equipment constraints. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The effects of transmission system configuration on generation dispatch are analysed according to design specifications. 

    ASSESSMENT CRITERION 2 
    The effect of generation location on system energy losses is explained according to design specifications. 

    ASSESSMENT CRITERION 3 
    The power transfer equation is explained within specified requirements. 
    ASSESSMENT CRITERION RANGE 
    Power angle increases with increased power transfer.
     

    ASSESSMENT CRITERION 4 
    Instability due to excessive power angle is explained according to design specifications. 

    ASSESSMENT CRITERION 5 
    Restrictions placed upon generation dispatch due to excessive power angle are explained according to demand requirements. 

    ASSESSMENT CRITERION 6 
    Computer programs to assist the load dispatcher are described according to design specifications. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this qualification must be registered as an assessor with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Any institution offering learning that will enable the achievement of this Qualification must be accredited as a provider with the relevant Education, Training, Quality, Assurance (ETQA) Body, or with an ETQA that has a Memorandum of Understanding with the relevant ETQA.
  • Assessment and moderation of assessment will be overseen by the relevant Education, Training, Quality, Assurance (ETQA) Body, or by an ETQA that has a Memorandum of Understanding with the relevant ETQA, according to the ETQA's policies and guidelines for assessment and moderation.
  • Moderation must include both internal and external moderation of assessments at exit points of the Qualification, unless ETQA policies specify otherwise. Moderation should also encompass achievement of the competence described both in individual Unit Standards as well as the integrated competence described in the Qualification.
  • Anyone wishing to be assessed against this Qualification may apply to be assessed by any assessment agency, assessor or provider institution that is accredited by the relevant ETQA. 
    		•

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Knowledge of power dispatch on an electrical interconnected system. 

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identifying & solving problems in which responses display that responsible decisions using critical and creative thinking have been made. 

    UNIT STANDARD CCFO COLLECTING 
    Collecting, analysing, organizing and critically evaluating information. 

    UNIT STANDARD CCFO COMMUNICATING 
    Communicating effectively using visual, mathematical and/or language skills in the modes of oral and/or written persuasion. 

    UNIT STANDARD CCFO SCIENCE 
    Using science and technology effectively and critically, showing responsibility towards the environment and health of others. 

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrating an understanding of the world as a set of related systems by recognizing that problem-solving contexts do not exist in isolation. 

    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 
    N/A 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  57693   National Diploma: Electrical Network Power Dispatch Controlling  Level 5  NQF Level 05  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  EWSETA 


    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.