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 underground distribution systems All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSTDSA Design underground distribution power systems KS01-TDS36A Design underground distribution power systems Evidence shall show an understanding of the designing of underground distribution power systems to an extent indicated by the following aspects T Mathematics techniques encompassing Calculations involving fractions decimals ratios proportions Calculations involving area volume mass and density Calculations involving transposition and substitution of formulae Calculations involving simple trigonometric problems T Engineering mechanics encompassing Identification of basic concepts principles and applications Application of velocity acceleration force density torque and pressure Applications of the SI units The relationship between work power and energy Behaviour of object under force using a block and tackle under load concept of mechanical advantage determination of resultant forces and determining the sag in a catenary conductor and the force applied at each end Fundamentals of the basic laws of fluid mechanics T Evidence shall show an understanding of materials properties encompassing Identification and classification of engineering materials material properties Types and applications properties of tensile strength effects of temperature on the expansion of metals ductility malleability work hardening and annealing and the conditions that lead to corrosion and the properties of timbers T Installation of underground cable encompassing Requirements for the use of enterprise construction manuals system diagramsplans 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 T Construction and types of underground cables encompassing Safety precautions specific to handling underground cables Requirements for the use of enterprise manuals system diagramsplans and drawings Types and applications of UC Construction types and structures of underground cables Characteristics of different types of underground cables Ratings T Principles of Statutory and safety considerations encompassing CommonwealthStateTerritory legislation standards codes supply authority regulations and or enterprise requirements associated with working on High Voltage Particular reference to State and Territory regulations regarding working near energised conductors electrical access heights confined space testing procedures licensing rules T The implementation and monitoring requirements for the impact of powerline installations and operation on the environment andor the area surrounding the powerline andor equipment encompassing Identification of relevant legislation codes and government guidelines for the implementation and monitoring of environmental impact factors in the workplace and areas of power distribution or transmission CommonwealthStateTerritory legislation relevant to the workplace and the Environment Protection Act legislation and common law Identification assessment control and monitoring of the hazards to the environment associated with the Powerline industry Workplace environment quality standards enterprise plan setting of acceptable emission level limits from power plant equipment impact of the enterprise activities on air and water quality nature impact and level of emissions from power plant power distribution and transmission equipment and network infrastructure noise generation noxious gas emissions greenhouse gas production electromagnetic emissions electromagnetic field strength oil leakage insulation breakdown products Provision of manufacturers and suppliers information such as material safety data sheets MSDSs Gathering of environment management information Maintenance of environmental records Risk assessment and its management in Powerline industry Maintenance strategies for environment protection programs developing processes for promoting maintaining and improving environmental impact in the workplace and identify techniques for the evaluating and reviewing environment protection education and training programs and elements of an effective environment protection management system EPA consultation and accidentincident investigations T Layout principles for underground mains distribution extension encompassing Commonwealth StateTerritory and local government legislation Standards codes supply authority regulations and or enterprise requirements applicable to underground mains distribution extension Requirements for the use of underground mains construction manuals system diagramsplans and drawings and for plans such as work method statements for the control of OHS risks Methods in determining material equipment and tool lists components types and quantity required spacing of components and equipment costings of items and components Purchasing and contractual arrangements to include a requirement to eliminate OHS hazards minimise risks and provide residual OHS risk information Determination of conductor size type and route length Resources needed for the laying of conductors Determining the appropriate excavation for the location Determining the size and depth of excavation Determining the trench and pit layout procedures Minimum clearances between conductors Estimation of the duration of underground distribution extension project T System components and layouts encompassing Distribution system layouts overheadunderground urbanrural HV customers high rise building systems three phase lines single phase lines SWER systems spur parallel and ring systems typical substation types Transmission system layouts lines buses transformers and cables linebus layouts including single double ring and breaker and half systems HV crossing methods T Basic design features and characteristics of underground cables lines polesstructures and associated equipment and or components encompassing Standards codes legislation supply authority regulations and or enterprise requirements applicable to installing conductors and associated equipment Overhead lines characteristics type of components characteristics of conductor material mechanical limitations and physical dimensions of lines current rating factors heating voltage drops power losses of conductors aerial bundled cables HV and LV covered conductors Characteristics and constructional features of poles and structures types of poles and structures characteristics of polesstructure materials mechanical limitations of polesstructures footings and additional support techniques Characteristics and constructional features of underground cables underground cables constructional features insulation materials and abbreviations cable dielectrics electric stress cable voltage drop Calculation of cable volt drop in relation to length of cable run Techniques in reducing electrical stress on cables Cable rating factors Methods of joining and terminating cables Techniques in the installation of cables above and below ground Techniques in cable testing and the location of cable faults Techniques in cable drawing |