8) 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 conducting high potential testing of underground power cables. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-TIS59A Power system underground power cables testing Evidence shall show an understanding of the conducting high potential testing of power system underground power cables to an extent indicated by the following aspects: T1 Installation of underground cable encompassing: Requirements for the use of enterprise construction manuals, system diagrams/plans and drawings Safety precautions specific to the installation of underground cable - excavation and trench safety regulations, gas detection procedures, working in confined spaces, personal protective equipment, hazards for the use of LPG equipment for jointing of underground cable, gas bottle testing procedures, permit to work systems and isolation procedures. Trench excavation and reinstatement procedures Installation of underground cable procedures - types of tools and equipment, methods of installing conduits, methods of installing cables and sealing cable ends (direct buried, ducts cleated and racked) Procedures for the safe use of LPG equipment for cable jointing T2 Location of cable faults in underground power cables encompassing: Standards, codes, legislation, supply authority regulations and or enterprise requirements Types of faults Methods of locating faults - Murray loop test, Fisher connection of Murray loop, modified Fisher connection, Varley loop test, time domain reflectometer (TDR), differential TDR radar, digital arc reflection, differential digital arc reflection, current impulse test, differential current impulse, decay, differential decay, pool of potential in earth (POPIE), radio detection, capacitance inductance test; pending faults (thermography and cable/joint temperature measurement); cable location devices/equipment and methods (signal generator/receiver, phasing methods using ‘megger’, current injection, cable stabbing techniques);cable identification Low voltage energised working practices: - regulations, working methods, insulating glove, bare hand, work procedures, specialist equipment. Safety precautions specific to working near conductors - safe working practices and procedures, working in confined spaces, permit to work systems and isolation procedures. T3 Jointing and termination of LV polymeric cable encompassing: Standards, codes, legislation, supply authority regulations and or enterprise requirements pertaining to the jointing of LV polymeric cables Types of cables - single core, multi core and XLPE insulation Methods of cable handling - direct laid cables, duct laid cables, solid laid cables, cables supported in cleats or hangers, corrosion protection, minimum bending radius of cables. Methods of cable sealing - shorting of cables cores, core of un-terminated cables, methods of protection from corrosion, polymeric sheathed cables sealing with mastic lined, heat shrink caps buried sealed ends. Types of jointing tools - general hand tools, compression tools Techniques in the use of LPG - safety precautions, personal protective equipment, general maintenance and repair. Safety precautions when cable jointing - working in confined spaces, permit to work systems and isolation procedures, emergency rescue/response including First Aid. T4 LV polymeric cable jointing principles encompassing: Techniques in jointing LV XLPE cables - straight through joint, jointing different types of cable and service and street light cable joints Techniques in terminating LV XLPE - pole top terminations, substation terminations, distribution pillar /column/cubicle terminations and service and street light cable terminations Techniques in repairing LV XLPE cable - different types of damage, repairs to sheath, repairs to cores Methods of testing cable after jointing T5 Standards, codes, legislation, supply authority regulations and or enterprise requirements pertaining to the jointing of HV underground polymeric cables T6 HV underground polymeric cables requirements for the use of enterprise construction manuals, system diagrams/plans and drawings, encompassing: Characteristics of different types of cables and components Purpose of stress control Applications of various tools and equipment for HV jointing T7 Procedure for isolating HV underground polymeric cables encompassing: Method for proving safe to work Earthing procedures T8 Techniques in jointing HV underground polymeric cable, encompassing: Short circuit cores and seal cable Straight through Trifurcating T9 Techniques in HV underground polymeric cable terminations encompassing: Pole top termination Substation/switchgear termination ABC termination Telcon termination T10 Procedures for repairing HV underground polymeric cables encompassing: Location of faults Types of damage Techniques to repairs to sheath Techniques to repairs to core T11 Jointing LV paper lead/lead type cables encompassing: Requirements for the use of enterprise manuals, system diagrams/plans and drawings Types of tools and equipment Types of LV cables Structure of LV PLY cables Techniques for lead wiping Technique for preparing and jointing LV lead sheathed paper insulated cables Installation methods of LV straight joint Inspection and repair procedures to outer sheath of lead sheathed LV cable Techniques in terminating LV lead sheathed paper insulated cables Methods of testing cable after jointing T12 HV paper lead cable jointing principles encompassing: Requirements for the use of enterprise manuals, system diagrams/plans and drawings Types of tools, equipment Types of HV cables Structure of HV cables Technique for the installation of transition joint between XLPE and lead sheathed, paper insulated cables Technique for the jointing, terminating and repairing of HV paper lead insulated cables Methods of testing cable after jointing T13 Underground cables construction and types encompassing: Safety precautions specific to handling underground cables Requirements for the use of enterprise manuals, system diagrams/plans and drawings Types and applications of UC Construction types and structures of underground cables Characteristics of different types of underground cables Ratings T14 Aluminium and lead cable sheathed — jointing procedures encompassing: Safety precautions specific to handling and jointing underground aluminium and lead cable including provision of OHS information such as material safety data sheets (MSDS) Requirements for the use of enterprise manuals, system diagrams/plans and drawings Construction and structure(s) of aluminium and lead cable underground cables Characteristics of aluminium and lead cable Ratings Techniques in the jointing of aluminium and lead sheathed cable Methods of testing cable after jointing. T15 Low voltage switching principles encompassing: Standards, codes, legislation, supply authority regulations and or enterprise requirements applicable to switching of low voltage to a given schedule Requirements for the use of manuals, system diagrams/plans and drawings - types, characteristics and capabilities of electrical apparatus, use, characteristics and capabilities of specialised tools and testing equipment, LV network interconnectors source of possible backfeed Low voltage switching techniques - identifying hazards, assessing and controlling risks associated with LV switching operations, electrical access permit(s), operational procedures, earthing procedures Personnel protective equipment (PPE) for LV switching |