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 overhead distribution systems All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSTDSA Power system overhead distribution design KS01-TDS35A Power system overhead distribution - design Evidence shall show an understanding of the designing of overhead 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 Behavior 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 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 ductibility malleability work hardening and annealing and the conditions that lead to corrosion and the properties of timbers T Installation of overhead distribution conductors encompassing Standards codes legislation supply authority regulations and or enterprise requirements applicable to installing conductors and associated equipment Requirements for the use of overhead line construction manuals system diagramsplans and drawings material lists conductor size type and route length Constructions types and structures for distribution and sub transmission lines Types sizes and characterises of overhead conductors Resources for the stringing and maintenance of conductors types of low and high voltage overhead electrical conductor connections causes and effects of poor electrical connections reasons for and methods used to maintain standard phase sequencing removing repairing and replacing of damage conductors minimum clearances between overhead conductors and low and high voltage structures Techniques for conductor installation types and application of tools equipment and hardware methods of stringing tensioning and termination of low and high voltage conductors T Installation of poles and or structures and hardware encompassing Standards codes legislation supply authority regulations and or enterprise requirements applicable to installing poles and associated hardware Requirements for the use of enterprise construction manuals system diagramsplans and drawings characteristics and applications of different types of poles and associated hardware Techniques for installing poles and associated hardware types of installation equipmenttools excavation methods types of footingsfoundations types of attachments earthing systems clearances between conductors safe methods of erecting and stabling poles and or structures and cross arms Techniques for maintenance of poles and associated hardware stabilisation techniques for unstable poles methods of strengthen poles maintenance and replacement of high voltage insulators and cross arms T Installation of metering and control equipment encompassing Standards codes legislation supply authority regulations and or enterprise requirements pertaining to the installation and maintenance of energy meters and associated equipment Types of meters kilowatthour meters single and polyphase demand meters recording meters and electronic recording metering systems summators Installation and removal methods direct connection and plug in method enterprise specific Types of associated equipment and accessories meter boards service fuse links contactors time switch audio frequency injection relay Testing procedures safety testing polarity testing T Different types and function of distribution components encompassing CommonwealthStateTerritory and local government legislation Standards codes Commonwealth StateTerritory and local government legislation supply authority regulations and or enterprise requirements applicable to the use and application of distribution components Requirements for the use of overhead line construction manuals system diagramsplans and drawings Types function and characteristics of distribution components Safety policies and procedures precautions related to the handling and installing distribution components 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 High voltage SWER system encompassing Application and function of SWER system components Circuit arrangement Principle of operation Hazards and procedures associated with faulty SWER earth systems Procedure to isolate energise and commission SWER substations T Power distribution network documentation encompassing Requirements for the use of manuals system diagramsplans and drawings and for plans such as work method statements for the control of OHS risks Types and application of power distribution network documentation drawings and documents wiring and schematic diagrams drawings and switching symbols mechanical drawings dealing with the power distribution network project charts schedules graphs technical manuals and catalogues instructionworksheets sheets Interpretation of different diagrams and documentation on LV and HV systems overhead distribution extensions underground distribution extensions distribution substation street lighting system T Layout principles for overhead distribution encompassing Commonwealth StateTerritory and local government legislation Standards codes supply authority regulations and or enterprise requirements applicable to overhead distribution layout Requirements for the use of overhead line 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 such as equipment poles crossarms 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 stringing and maintenance of conductors Types of low LV and HV overhead electrical conductor connections Minimum clearances between overhead conductors and low LV andHV structures Estimation of the duration of overhead 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 AC transmission system components encompassing Support structures and reasons for selection Insulators and reasons for selection Conductors and reasons for selection Vibration management systems and principles Line ratings based on voltage span tension and temperature T AC transmission line electrical parameters encompassing Typical arrangements Parameters of significance Calculation of line parameters Calculation of resistive inductive and capacitive values assuming regular transposition and solid conductors Comparison with actual values Typical parameter values and ratios for different voltage level lines T AC transmission line models encompassing Types of transmission line models based on line length Calculation of voltage drop line regulation and transmission efficiency Load sharing between lines T Basic design features and characteristics of polesstructures and associated equipment and or components encompassing Standards codes legislation supply authority regulations and or enterprise requirements applicable to installing of polesstructures and associated equipment and or components Distribution systems principles terminologies primary and secondary voltage levels supply quality load curve profiles residentialindustrialcommercial types of feeders urban and rural singlephase systems SWER Characteristics of poles types of poles wood concrete and steel installation methods of poles tooling rake life labelling sinking maintenance techniques of poles above and below ground pole strength and loads Characteristics of associated equipment used on poles and structures crossarms types and standard sizes insulators 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 |