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: 

Demonstrate knowledge and understanding of system frequency and tie-line control 
SAQA US ID UNIT STANDARD TITLE
242754  Demonstrate knowledge and understanding of system frequency and tie-line control 
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 accredited with this unit standard will be able to describe how and by what means frequency and tie?line flows are controlled between control areas. 

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 4. 
    		•

    UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Explain electrical frequency concepts. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Alternating current interconnection concepts and theories are explained according to design specifications. 

    ASSESSMENT CRITERION 2 
    Frequency parameters and characteristics at which the interconnection operates are described according to requirements. 

    ASSESSMENT CRITERION 3 
    The role of transmission lines in maintaining synchronism is explained according to requirements. 

    ASSESSMENT CRITERION 4 
    Causes of frequency deviations from nominal are explained according to design specifications. 

    ASSESSMENT CRITERION 5 
    Concepts of frequency control are described within the local environment. 

    ASSESSMENT CRITERION 6 
    Speed governor function and purpose are explained according to design specifications. 

    ASSESSMENT CRITERION 7 
    The size of an interconnection deviation that affects frequency control is understood. 

    ASSESSMENT CRITERION 8 
    The importance of tie-line control flow is explained according to requirements. 

    ASSESSMENT CRITERION 9 
    Types of generating plant response to frequency changes are explained according to design specifications. 

    ASSESSMENT CRITERION 10 
    The relationship between generation rotational speed and frequency is explained according to requirements. 

    SPECIFIC OUTCOME 2 
    Explain primary control and frequency. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Speed governors control, concepts and theory are explained according to design specifications. 

    ASSESSMENT CRITERION 2 
    Basic characteristics of an interconnected system are explained according to design specifications. 

    ASSESSMENT CRITERION 3 
    Total capacity, capacity under governor control and total load are explained according to requirements. 

    ASSESSMENT CRITERION 4 
    Governor control response to frequency when a unit trips and loss of load is explained as applicable to local applications. 

    ASSESSMENT CRITERION 5 
    The relationship between generation, load and frequency is explained according to requirements. 

    SPECIFIC OUTCOME 3 
    Describe frequency dynamics and tie-line control. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The net tie-line flow following loss of generation within a control area is determined according to requirements. 

    ASSESSMENT CRITERION 2 
    Automatic Governor Control (AGC) assistance to system operators and how frequently AGC application software is run is explained according to requirements. 

    ASSESSMENT CRITERION 3 
    Concepts related to Area Control Error are explained as applicable to local applications. 

    SPECIFIC OUTCOME 4 
    Explain automatic governor control. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    The Frequency Bias Coefficient, Beta (b), and how it relates to AGC is explained according to requirements. 

    ASSESSMENT CRITERION 2 
    Area Control Error (ACE) frequency deviation, nett - tie line deviation, frequency stabilisation point and Beta (b) are determined according to requirements. 

    ASSESSMENT CRITERION 3 
    Functions that AGC can perform are described according to requirements. 
    ASSESSMENT CRITERION RANGE 
    Excludes response to generation loss.
     

    ASSESSMENT CRITERION 4 
    AGC suspension when large frequency deviations occur are described as applicable to local applications. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner or moderating the assessment of a learner against this unit standard 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 unit standard 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 unit standard, unless ETQA policies specify otherwise. Moderation should also encompass achievement of the competence described both in individual Unit Standard.
  • Anyone wishing to be assessed against this unit standard 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 and understanding of system frequency and tie-line control. 

    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.