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Elements and Performance Criteria

  1. Plan for and coordinate the design of transmission, sub-transmission and zone substation earthing
  2. Carry out and coordinate the design of transmission, sub-transmission and zone substation earthing
  3. Complete and coordinate the design of transmission, sub-transmission and zone substation earthing

Required Skills

Essential Knowledge and Associated Skills EKAS This describes the essential skills and knowledge and their level required for this unit

Evidence shall show that knowledge has been acquired of designing transmission subtransmission and zone substation earthing

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSTDSA Power system transmission and subtransmission substation earthing

KS01-TDS55A Power system transmission and sub-transmission substation earthing

Evidence shall show an understanding of designing power system transmission and subtransmission earthing to an extent indicated by the following aspects

T Distribution earthing system encompassing

Standards codes legislation supply authority regulations and or enterprise requirements applicable to the distribution earthing system

Reason and types of distribution earthing systems

Terminologies used in the earth systems including touch and step potential

Conditions associated when an active HV conductor fails to earth

Selection of earthing electrodes and grids

Determination of the earthing resistance of copper clad rods using earthing monograms

T Principles of transmission subtransmission and zone substation earthing designs encompassing

Commonwealth StateTerritory and local government legislation Standards codes supply authority regulations and or enterprise requirements applicable to the substation design management principles

Requirements for the use of the substation system construction manuals system diagramsplans and drawings and for plans such as work method statements for the control of OHS risks

Types of activities to be carried out earth resistivity tests coordination design of the earth grid confirmation of control of transfer of EPR

Types of earthing design parameters coordination and analysis of earth resistivity tests design and drafting of earth grid including electrodes grid connections equipment connections and remote earthing connections to conduct maximum earth fault currents without exceeding the maximum allowable earth potential rise EPR confirmation of acceptable step and touch potentials including attenuation or hazard control measures water telephone service and LV neutral supplies isolation to isolate local EPR

Evidence Required

This provides essential advice for assessment of the unit of competency and must be read in conjunction with the Performance Criteria and the range statement of the unit of competency and the Training Package Assessment Guidelines

The Evidence Guide forms an integral part of this Competency Standard Unit and shall be used in conjunction with all component parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the Industrys preferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment It is recognised that in some circumstances assessment in part or full can occur outside the workplace However it must be in accord with Industry and Regulatory policy in this regard

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Hence sources of evidence need to be rich in nature so as to minimise error in judgment

Activities associated with normal every day work have a bearing on the decision as to how much and how detailed the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practiced These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites shall be met

Evidence for competence in this unit is based shall be considered holistically Each element and associated Performance Criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UETUET Evidence shall also comprise

A representative body of Performance Criteria demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the Performance Criteria and range and

Apply sustainable energy principles and practices as specified in the Performance Criteria and range and

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit to such an extent that the learners performance outcome is reported in accordance with the preferred approach namely a percentile graded result where required by the regulated environment and

Demonstrate an appropriate level of employability skills and

Conduct work observing the relevant Anti Discrimination legislation regulations policies and workplace procedures and

Demonstrated performance across a representative range of contexts from the prescribed items below

Range of toolsequipmentmaterialsproceduresworkplacesother variables

Group No

The minimum number of items on which skill is to be demonstrated

Item List

A

Completion of two compliant technical designs including each of the following

Coordination and analysis of earth resistivity tests

Design and drafting of earth grid including electrodes grid connections equipment connections and remote earthing connections to conduct maximum earth fault currents without exceeding the maximum allowable earth potential rise EPR

Confirmation of acceptable step and touch potentials including attenuation or hazard control measures

Confirmation of control of transfer of EPR

B

Designs should also include all the following

Activities that address the correction of errors in the process

Application of a design control checklist which lists all of the required design activities to be carried out in this process

C

At least one occasion

Dealing with an unplanned event by drawing on essential knowledge and associated skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual design of transmission subtransmission and zone substation earthing

In addition to the resources listed above in Context of and specific resources for assessment evidence should show demonstrated competency working realistic environment and a variety of conditions

Method of assessment

This Competency Standard Unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the Industry to which this Competency Standard Unit applies This requires that the specified essential knowledge and associated skills are assessed in a structured environment which is primarily intended for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and associated skills described in this unit

Concurrent assessment and relationship with other units

There are no recommended concurrent assessments with this unit however in some cases efficiencies may be gained in terms of learning and assessment effort being concurrently managed


Range Statement

10) This relates to the unit of competency as a whole providing the range of contexts and conditions to which the Performance Criteria apply. It allows for different work environments and situations that will affect performance.

This Competency Standard Unit shall be demonstrated in relation to the design of transmission, sub-transmission and zone substation earthing and may include the following:

Concerns associated with the earthing design should take into account: Grid designed for max fault current, maximum allowable earth potential rise, step potentials, touch potentials, fence separately earthed or bonded to station grid, fence isolation from all items bonded to station grid, e.g. building, grading ring outside fence, two connections to every switchyard device, disconnector earth mats bonded directly to handle, disconnectors earthed correctly, control building(s) earthed in two places, switchgear building (s) earthed in two places, two connections to switchgear earth bar (s), two connections to control panel earth bar (s), sufficient portable earth connection points, gates earthed via flexible connections, equipotential conductor between all gate posts, grading ring extends to extremity of gate radius, fence earthed adequately, earthing of sheath at substation end of power cables and earthing of sheath at remote end of power cables

The following constants and variables included in the element/Performance Criteria in this unit are fully described in the Definitions Section 1 of this volume and form an integral part of the Range Statement of this unit:

Appropriate and relevant persons (see Personnel)

Appropriate authorities

Appropriate work platform.

Assessing risk

Assessment

Authorisation

Confined space

Diagnostic, testing and restoration.

Documenting detail work events, record keeping and or storage of information.

Drawings and specifications

Emergency

Environmental and sustainable energy procedures

Environmental legislation.

Environmental management documentation.

Established procedures.

Fall prevention

Hazards

Identifying hazards

Inspect

Legislation

MSDS

Notification.

OHS practices

OHS issues

Permits and / or permits to work

Personnel.

Quality assurance systems.

Requirements.

Safe design principles

Testing procedures

Work clearance systems