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Elements and Performance Criteria

  1. Prepare/plan to maintain high current DC switchgear and equipment
  2. Carry out the maintenance of high current DC switchgear and equipment
  3. Complete the maintenance of high current DC switchgear and equipment

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 maintaining high current DC switchgear and equipment

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

KSTSBA High current DC equipment and switchgear maintenance

KS01-TSB27A High current DC equipment and switchgear - maintenance

Evidence shall show an understanding of high current DC equipment and switchgear maintenance to an extent indicated by the following aspects

T Safe working on energised low voltage equipment encompassing

Standards codes Commonwealth StateTerritorylocal government legislation supply authority regulations and or enterprise requirements

Safety precautions specific to working on or near energised low voltage conductors safe working practices and procedures identification of hazards assessment and control of OHS risks types selection maintenance and use of personal protective equipment

Work on or near energised LV conductors types and function of specialised tools safe working practices when using specialised tools methods of using specialised tools safe procedures for work on panels and in cubicles on or near energised LV conductors release and rescue procedures for work on or near exposed energised LV conductors

T Enterprise specific policy and procedure instructions encompassing

Responsibilities and duty of care of employer and employee relationship

Methods of obtaining the uptodate information on enterprise policy and procedures

Rules and regulations

Induction into workplace location of work area and storage area timetable uniform personal wellbeing housekeeping rules emergency procedures evacuation procedures

Techniques when deal with others working in teams customer relation complaint and issues procedures

Overview of enterprise professional development fire fighting procedures fatigue management training and competency development understanding and promotion

T Enterprises specific OHS instructions encompassing

Standards codes legislation supply authority regulations and specific enterprise regulations pertaining to the OHS policies and procedures

Methods of obtaining the uptodate information on enterprise OHS policy and procedures

Specific enterprise personal protection equipment type and application where and when to be used method of replacement responsibility of maintenance including cleaning inspection and testing emergency response rescue evacuation and First Aid procedures

Personal wellbeing hygiene fatiguestress management drugsalcohol

OHS training induction training specific hazard training specific task or equipment training emergency and evacuation training training as part of broader programs such as equipment operation

OHS records including audits inspection reports workplace health and environmental monitoring records training and instruction records manufacturers and suppliers information such as MSDSs registers maintenance reports workers compensation and rehabilitation records and First Aidmedical records

T Enterprises specific technical drawing and documents encompassing

Types and application of enterprise specific drawings and documents electrical and electronic drawings mechanical drawings project charts schedules graphs technical manuals and catalogues

Instructionworksheets sheets types and application of enterprise specific symbols and diagrams

Title box description of parts and version control

T Enterprise specific switching diagrams and drawing encompassing

Types and application of enterprise specific switching drawings and documents wiring and schematic diagrams and switching symbols mechanical drawings dealing with switching operations project charts switching schedules graphs technical manuals and catalogues instructionwork sheets

Interpretation of different system switching diagrams LV system switching diagrams DC traction supply sectioning diagrams HV transmission and distribution system symbols and feeder plans processes of updating switching diagrams

T Enterprises specific specialised tools encompassing

Legislation Standards codes legislation supply authority regulations and specific enterprise regulations pertaining to the use and care of specialised tools voltage detectors polarity testers phase rotation

Characteristics capabilities and application of specialised tools for a particular job

Safety policies procedures and precautions with regards to using transporting and storage of specialised tools

Selection methods for obtaining the correct specialised tool for the particular job including during procurement purchasing and or hiring arrangements

Techniques in preuse inspection on the serviceability of specialised tools

Techniques in the selection use maintenance and care and storage of specialised tools

Identifying OHS hazards assessing and controlling risks associated with their use

Techniques for the safe use of specialised power tools

T Enterprise Specific Equipment Installation Procedures encompassing

Standards codes legislation supply authority regulations and or enterprise requirements applicable to equipment installation

Requirements for the use of manuals substation diagramsplans and drawings

Types characteristics and capabilities of HV substation equipment to be installed

Identification of components within the equipment to be Installed and associated control housings

Use characteristics and capabilities of specialised tools and equipment

Enterprise Specific Policies and Procedures for equipment to be installed

Control equipment and auxiliary relays flags and alarms

Techniques in evaluating serviceability of equipment to be Installed

Safety precautions when testing and measuring equipment to be Installed safe working practices and procedures identification of hazards assessment and control of OHS risks types selection maintenance and use of personal protective equipment responsibilities and protocols safe working clearances

Remote and local operating principles and conventions

T Enterprise Specific Data Management Processes encompassing

Standards codes legislation supply authority regulations and or enterprise requirements applicable to Data Management

Requirements for the use of manuals substation diagramsplans and drawings

Types of enterprise specific computer software

Techniques in storing and retrieving data and reports from the computer

Techniques in using the Data Management systems in following necessary commands and protocols in accordance with the Enterprise Specific Procedures

Calculation of results and data measurements using the computer

Techniques in the preparation of preliminary works creation and closure

T Substation DC circuit breaker principles encompassing

Standards codes CommonwealthStateTerritory legislation supply authority regulations and or enterprise requirements associated with the DC circuit breakers

Types of DC CBs self and withdrawable types

Characteristics of DC CBs purpose of DC CBs application of DC CBs

Principles of operation of different types of DC CBs arc expulsion versus arc containment latched versus magnetically held advantages and disadvantages of different types fixed or withdrawable protectiondiagnostic technology

Principles of operation of high speed DC CB characteristics calibration

How DC CBs are designated feeder rectifier EDR bussection and negative breakers autoreclose or non autoreclose type

Type and function of DC CB peripheral components delta I relays busbar control wiring trunk and associated plugreceptacle

Identification characteristics application and care of DC CB components holding coils closing coils contactors resistors arc chutes blowout coils arcing contacts main contacts braids moving arm pole face arcing horns electronic cards dashpots fingers diode strings fuses insulators latching mechanisms motors wiring relays

Characteristics application and care of hand and specialised tools used on DC CBs combinationmultigripslong nose pliers side cutters screwdrivers wire strippers crimpers knife hacksaw hammers mallets levels tape measures spanners Twrench pistol drills battery drills heat gun desoldering tools and soldering irontorches Allen keys socket spanners gauges feeler gauges and specialist tools supplied by the manufacturers

Characteristics application and care of test and measurement instruments used on DC CBs multimeters tong testers ammeters voltmeters ohmmeters test lamps high and low voltage insulation resistance continuity testers earth resistance tester Ductor dropout test sets

T Maintenance of substation DC circuit breakers and associated equipment encompassing

Standards codes CommonwealthStateTerritory legislation supply authority regulations and or enterprise requirements associated with the maintenance of DC circuit breakers

Requirements for the use and interpretation of manuals system diagramsplans and drawings V sectioning diagrams substation HV operating diagrams substation arrangement diagrams and layout drawings technicalmanufactures specifications maintenance instructionsschedules

Relationship and function of DC CBs equipmentcomponent interface DC CB frame connection fingers associated busbar physical arrangements and clearances

Safety precautions when undertaking maintenance procedures on DC CBs safe working practices Occupational Health and Safety hazards and precautions identification of hazards assessing and controlling risks types selection maintenance and uses of personnel protective equipment permit to work systems and isolation procedures types and function of specialised equipment safe working practices when using specialised equipment emergency response and rescue including First Aid etc

Techniques in maintenance of DC CBs closing and opening operations range settings adjustments and calibration spring settings main contact arrangement and auxiliary contact arrangement arc chute inspection and procedures basic fault finding and repairadjustment techniques control cards their uses application and fault finding earthing requirements and techniques

Techniques in testing and commissioning of DC CBs supply authority regulations and or enterprise requirements standards and procedures

T Installation of substation Direct Current circuit breakers DC CBs and associated equipment encompassing

Standards codes legislation supply authority regulations and or enterprise requirements pertaining to the installation of substation Direct Current circuit breakers DC CBs

Safety precautions when installing substation Direct Current circuit breakers DC CBs safe operation procedures Occupational Health and Safety hazards and precautions identification of hazards assessing and controlling risks types selection maintenance and uses of personnel protective equipment permit to work systems and isolation procedures safe working practices when using specialised equipment emergency response and rescue including First Aid etc

Use and interpretation of technical manuals and diagrams manufacturerEnterprise Manuals block wiring and schematic diagrams V sectioning diagrams substation HV operating diagrams substation arrangement diagrams and layout drawings technicalmanufactures specifications maintenance instructionsschedules

Techniques in the safe installation of DC CBs

Evidence Required

This provides essential advice for assessment of the competency standard unit and must be read in conjunction with the Performance Criteria and the Range Statement of the competency standard unit 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 shall be considered holistically Each element and associated Performance Criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UET 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

All of the following

Multimeters

Low resistance high current

Megger tester

Ammeter

Voltmeter

V drop out tester

Wiring diagrams

Schematic drawings

Operating and substation arrangement diagrams

Building layouts

Cable block and schedule diagrams

B

At least six of the following

Direct current circuit breakers

Rectifier transformers

Rectifiers

Isolators and links

Harmonic filters

Negative reactors

Energy dissipation resistors

C

At least ten of the following

DC feeders

Surge arresters

Isolating links

Busbar

Cables

Cable supports

Pits and enclosures

Protectionalarm systems

Control wiring

Metering

Supervisory interface

Cabinets

REC

D

All of the following

Cable terminations

Busbar terminationjoint

Alignment of electrical contacts of withdrawable equipment

E

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 maintenance of high current DC switchgear and equipment

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

Below ground in limited spaces with different structuralconstruction types and method and in a variety of environments

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 Transmission Distribution and Rail Traction Industry 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 concurrent assessment recommendations for this unit


Range Statement

10) This relates to the competency standard unit 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 maintenance of high current DC switchgear and equipment.

DC switchgear and other equipment includes but is not limited to Direct Current Circuit Breakers, rectifier transformers, rectifiers, invertors, isolators and links, harmonic filters, negative reactors and energy dissipating resistors (EDR’s) and rail earth contactor.

Associated equipment may include DC feeders, surge arresters, isolating links, busbar, cables, cable supports, pits and enclosures, protection/alarm systems, control wiring, metering, supervisory interface, cabinets,

Associated components may include main and auxiliary contacts, holding coils, contactor, busbar fingers, diodes, heatsinks, capacitors, fuses, metering, shunts, resistors banks, resistor bank housing.

Test and measurement equipments may include multimeters, low resistance high current, megger tester, ammeter, voltmeter, 1500V drop out test set, feeler gauge.

Drawings can refer to wiring, schematic, operating and substation arrangement diagrams, cable block and schedule diagrams and building layouts.

Confined Spaces may apply to pits, cable tunnels, false floors, and cable basements.

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

Testing procedures

Work clearance systems